CN110907883B - Metering supervision method and system for automatic verification system of electric energy meter - Google Patents
Metering supervision method and system for automatic verification system of electric energy meter Download PDFInfo
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Abstract
The invention provides a metering supervision method and system of an automatic electric energy meter verification system. The method and the system respectively establish a first control chart and a second control chart which are generated by repeatedly measuring a standard electric energy meter calibrating device and an electric energy meter automatic calibrating system by using the standard electric energy meter which passes stability examination as a checking standard, monitor the calibrating quality of the electric energy meter to be checked in a certain time period or a certain batch by real-time control of the calibrating process of the electric energy meter automatic calibrating system and check whether the control chart of the electric energy meter automatic calibrating system is abnormal by presetting checking frequency, ensure that the running state of the electric energy meter automatic calibrating system is in a controllable range, solve the problem of hysteresis existing in the traditional manual supervision and management mode, simultaneously provide reference for a metering supervision mode of manual re-examination of the electric energy meter by a metering administration department, and reduce manpower and material resources input by the quality supervision and management department.
Description
Technical Field
The invention relates to the field of electric energy measurement, in particular to a metering supervision method and system of an electric energy meter automatic verification system.
Background
Along with the development of intelligent power grid construction, the automatic verification system of the electric energy meter is put into use, so that the large-batch and full-automatic verification of the installed electric energy meter is realized, and the verification efficiency of the electric energy meter is greatly improved. The problem that follows is that the installation type electric energy meter belongs to the strong detection metering appliance for trade settlement, the automatic verification system of the electric energy meter has a complex structure and relates to a plurality of scientific fields such as machinery, measurement and control, photoelectricity and the like, and each link faces uncertain risks of long-time and large-batch operation reliability and data accuracy.
At present, the metering supervision of an automatic verification system of an electric energy meter adopts a manual reinspection method. The first inspection of the installed electric energy meter is completed by an automatic electric energy meter verification system, then the electric energy meter qualified in the first inspection is subjected to spot inspection according to a certain proportion, and the spot inspection mode is manual reinspection.
The following problems exist in manual reinspection: firstly, manual meter hanging is needed for rechecking, the workload is large, the efficiency is low, if the annual verification capability is required to be 338 thousands of electric energy meters (including 300 thousands of annual verification capability of single-phase electric energy meters and 38 thousands of annual verification capability of three-phase electric energy meters), the annual spot check amount can reach more than 30 thousands according to the proportion of 10%, and the workload is large; and secondly, manual inspection belongs to post quality control, certain delay exists, when misjudgment exists in the automatic electric energy meter verification system after re-inspection, batch electric energy meters are judged to be qualified through the automatic electric energy meter verification system, and the tracing cost is very high.
Therefore, there is a need for a technique that can convert the time quality control of an electric energy meter automatic verification system into a temporary quality control.
Disclosure of Invention
In order to solve the technical problems that in the prior art, the metering supervision of an automatic electric energy meter calibration system belongs to post-event quality control, the workload of manual reinspection is large, and the tracing cost is high when the reinspection system finds that misjudgment exists, the invention provides a metering supervision method of the automatic electric energy meter calibration system, which comprises the following steps:
selecting a standard electric energy meter as a checking standard component;
carrying out a plurality of groups of measurement for the first time on the checking standard component by using a standard electric energy meter calibrating device, and determining that the checking standard component is qualified in stability check when the plurality of groups of measurement values for the first time meet the stability criterion;
after the stability assessment of the checking standard component is qualified, performing a plurality of groups of measurements on the checking standard component for the second time by using the standard electric energy meter calibrating device, calculating the average value of the plurality of groups of measurements for the second time to be used as a reference value given to the checking standard component by the standard electric energy meter calibrating device, establishing a first database of the checking standard component according to the plurality of groups of measurements, and generating a first control chart based on the first database;
the electric energy automatic verification system carries out a plurality of sets of measurement for the third time on the check standard component, and when the plurality of sets of measurement values for the third time and the reference value meet the verification criterion of the capacity of the electric energy meter automatic verification system, the electric energy meter automatic verification system is determined to meet the measurement requirement;
when the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement, the automatic electric energy verification system performs a plurality of groups of measurements for the fourth time on the check standard component, and when the measured values of the plurality of groups for the fourth time meet the steady-state criterion of the automatic electric energy meter verification system in the measuring process, the automatic electric energy meter verification system is determined to reach the steady state in the measuring process;
when the measuring process of the electric energy meter automatic verification system reaches a steady state, the electric energy automatic verification system carries out a plurality of groups of fifth measurement on the check standard component, establishes a second database of the check standard component according to the plurality of groups of fifth measurement, and generates a second control chart based on the second database;
transferring the check standard component to an electric energy meter automatic verification system according to a preset check frequency, automatically updating the new measurement value to a second database to generate a new second control chart after the electric energy meter automatic verification system measures the check standard component for one time, and judging whether the new second control chart has an out-of-control point according to a preset control chart out-of-control point judgment rule;
when the new second control chart does not have an out-of-control point, determining that the automatic verification system of the electric energy meter works normally;
when the new second control chart has an out-of-control point, after the standard electric energy meter calibrating device is used for measuring the check standard element for one time, the new measurement value is automatically updated to the first database to generate a new first control chart, and whether the new first control chart has the out-of-control point is judged according to a preset control chart out-of-control point judgment rule;
when an out-of-control point occurs in the new first control chart, determining that the check standard component is damaged, and replacing the new check standard component;
and when the measurement capability of the automatic verification system of the electric energy meter does not meet the measurement requirement, or when the measurement process of the automatic verification system of the electric energy meter does not reach a steady state, or when an out-of-control point appears on the new second control chart and the out-of-control point does not appear on the new first control chart, determining that the automatic verification system of the electric energy meter works abnormally.
Further, the step of performing a plurality of groups of measurements on the check standard component for the first time by using a standard electric energy meter calibration device, and when a plurality of groups of measurement values for the first time meet a stability criterion, determining that the stability assessment of the check standard component is qualified comprises:
repeatedly measuring the checking standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, recording N times of measured values of each time interval as a group of measured values, and taking the arithmetic mean value of the measured values as the measured value y i ；
Determining the measured value y within the time period i Maximum value y of max And the minimum value y min ；
Judging the measured value y i Maximum value y of max And the minimum value y min Whether a criterion for checking the stability of the standard component is met, wherein the formula of the stability criterion is as follows:
|y max -y min |<|MPEV|
in the formula, MPEV is the maximum allowable error value of the corresponding preset load point;
when the measured value y i Maximum value y of max And the minimum value y min And when the absolute value of the difference is smaller than the maximum allowable error, the stability assessment is qualified.
Further, after the examination of the stability of the standard component is qualified, performing a plurality of sets of measurements on the standard component for the second time by using the standard electric energy meter calibration device, calculating an average value of the plurality of sets of measurements for the second time as a reference value given to the standard component by the standard electric energy meter calibration device, establishing a first database of the standard component for the verification according to the plurality of sets of measurements, and generating a first control chart based on the first database includes:
in a time period, repeatedly measuring the check standard component by using a standard electric energy meter calibrating device according to a preset time interval, and recording N times of measured values of each time interval as a group of measured values;
establishing a first database according to the measured values of all groups of the checking standard components in the time period, and calculating the average value of the measured values of each group
And standard deviation s N ；/>
Calculating the average value of all groups of the check standard component in the time period
Is based on the mean value->
And standard deviation s of the total number of groups N Is greater than or equal to>
And taking the mean value->
Reference value y given to check standard component as standard electric energy meter calibrating device ref ；
According to the average value
And the mean standard deviation->
And the standard electric energy meter calibrating device measures the times N of the checking standard component at each time interval, and respectively determines the average value of each group of measured values of the checking standard component
And standard deviation s N The upper control limit, the lower control limit and the center line have the calculation formula:
wherein, when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N,
are in each case the mean value of each measurement>
Upper control limit, centerline and lower control limit of (4), in conjunction with the control signal>
Standard deviation s for each set of measurements N Upper, center and lower control limits of A 3 、B 3 、B 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for N times according to a preset parameter corresponding table;
according to the average value of each group of measured values of the check standard component in the time period
Upper control limit of
Center line->
And a lower control limit>
Establishing a first mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period N Upper control limit->
Center line->
And lower control limit
A first standard deviation control map is created, which includes a first mean control map and a first standard deviation control map.
Further, the electric energy automatic verification system performs a plurality of sets of measurement for the third time on the check standard component, and when the plurality of sets of measurement values for the third time and the reference value satisfy the verification criterion of the capacity of the electric energy meter automatic verification system, determining that the measurement capacity of the electric energy meter automatic verification system satisfies the measurement requirement includes:
selecting the checking standard as a blind sample;
the electric energy meter automatic verification system carries out a plurality of sets of measurement for the third time on the check standard component, wherein each set of measurement is carried out once, and the measurement value is recorded as y lab ；
Judging the measured value y lab And the reference value y ref Whether the capacity verification criterion meets the capacity verification criterion of the automatic verification system of the electric energy meter or not is determined, wherein the capacity verification criterion is determined by the following formula:
|y ref -y lab |≤U lab
in the formula of U lab Expanding uncertainty for a preset automatic calibration system of the electric energy meter;
when the reference value y ref And the measured value y lab The absolute value of the difference is less than the extension uncertainty U lab And meanwhile, determining that the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement.
Further, after the measurement capability of the automatic electric energy meter verification system meets the measurement requirement, the automatic electric energy meter verification system performs a plurality of sets of measurements on the check standard component for the fourth time, and when the plurality of sets of measurements for the fourth time meet the steady-state criterion of the automatic electric energy meter verification system, determining that the measurement process of the automatic electric energy meter verification system reaches a steady state comprises:
repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, recording n times of measured values of each time interval as a group of measured values, and calculating the average value of each group of measured values
And a range R;
calculating the average value of all groups of the check standard component in the time period
Is based on the mean value->
And the mean pole deviation of the pole deviations R of all groups->
According to the average value
And average pole difference->
And the times n of measurement of the standard checking standard component by the standard electric energy meter verification device in each time interval are respectively determined, and the average value of each group of measurement values of the checking standard component is determined>
And extreme difference R n The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is n,
and &>
In each case as the mean of the measurement values of each group>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Respectively, the range R of each set of measured values n Upper, center line and lower control limit of (A) 2 、D 3 、D 4 Is constant, and its value is taken as standard electric energy according to preset parameter corresponding tableThe corresponding numerical value when the number of times of measuring the check standard component at each time interval by the meter calibrating device is n; />
Judging the average value of each group of measured values of the check standard component in the time period
And its upper control limit
Lower control limit->
Extreme difference R n And control limits thereon>
Under control limit>
And on average pole difference->
Whether the steady-state criterion of the automatic verification system of the electric energy meter in the measurement process is met or not is determined, wherein the steady-state criterion of the measurement process is determined by the following formula:
C pk ≥k
in the formula, C pk Is a process capability index, k is a preset process capability threshold, M is a tolerance center, the value is 0, mu is a mean value, T is a preset error limit amplitude, d 2 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
when the calculated value of the process capability index is greater than or equal to a process capability threshold value and the average value of each group of measured values of the check standard component in the time period
And extreme difference R n And when the measurement process of the automatic calibration system of the electric energy meter does not reach the steady state, determining that the automatic calibration system of the electric energy meter works abnormally.
Further, after the measurement process of the automatic electric energy meter verification system reaches a steady state, the automatic electric energy meter verification system performs a fifth plurality of groups of measurements on the check standard component, establishes a second database of the check standard component according to the fifth plurality of groups of measurements, and generates a second control chart based on the second database includes:
in a time period, repeatedly measuring the check standard component by using a standard electric energy meter calibrating device according to a preset time interval, and recording t times of measured values of each time interval as a group of measured values;
establishing a second database according to the measured values of all groups of the checking standard components in the time period, and calculating the average value of the measured values of each group
And standard deviation s t ；
Calculating the average value of all groups of the check standard component in the time period
In a mean value of>
And standard deviation s of all groups t Is greater than or equal to>
According to the average value
And an average standard deviation>
And the number t of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And standard deviation s t The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is t,
and &>
Are in each case the mean value of each measurement>
The upper limit of the control of (a) is, center line and lower control limit, <' > or>
And &>
Standard deviation s of each set of measured values t Upper, center line and lower control limit of (A) 3 、B 3 、B 4 The value is constant, and a value corresponding to the number of times that the standard electric energy meter calibrating device measures the check standard component at each time interval is t is taken according to a preset parameter corresponding table;
according to the average value of each group of measured values of the checking standard component in the time period
Upper control limit
Center line->
And a lower control limit>
Establishing a second mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period t Upper control limit of (4)>
Center line->
And lower control limit
A second standard deviation control map is created, which includes a second mean control map and a second standard deviation control map.
Further, the step of transferring the check standard component to an electric energy meter automatic verification system according to the preset check frequency, after the electric energy meter automatic verification system measures the check standard component for one time, automatically updating the new measurement value to a second database to generate a new second control chart, and judging whether an out-of-control point occurs in the new second control chart according to a preset control chart out-of-control point judgment rule includes:
according to the preset checking frequency, after the checking time of the electric energy meter automatic checking system is reached, the checking standard piece is transferred to the electric energy meter automatic checking system, the checking standard piece is measured for one time, and the new measurement value is updated to a second database;
generating a new second control chart according to the method for generating the second control chart according to the measurement values of all the checking standard elements in the updated second database, wherein the new second control chart comprises a new second mean control chart and a new second standard deviation control chart;
judging whether an out-of-control point occurs in a new second standard deviation control chart and a new second mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new second standard deviation control chart or the new second standard deviation control chart has no out-of-control point and the new second mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new second control chart, and conversely, when the new second standard deviation control chart and the new second standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new second control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated second database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
Further, when the new second control chart has an out-of-control point, after the standard electric energy meter calibrating device measures the check standard component for one time, the new measurement value is automatically updated to the first database to generate a new first control chart, and whether the new first control chart has the out-of-control point or not is judged according to a preset control chart out-of-control point judgment rule, including:
when an out-of-control point occurs in a new second control chart, sending the check standard component to a standard electric energy meter verification device, measuring the standard component again, updating a new measurement value to a first database, and generating a new first control chart according to the method for generating the first control chart according to the measurement values of all the check standard components in the updated first database, wherein the new first control chart comprises a new first mean control chart and a new first standard deviation control chart;
judging whether an out-of-control point occurs in a new first standard deviation control chart and a new first mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new first standard deviation control chart or the new first standard deviation control chart has no out-of-control point and the new first mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new first control chart, and conversely, when the new first standard deviation control chart and the new first standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new first control chart, wherein the control chart out-of-control point judgment rule refers to that a measured value does not fall within the upper and lower control limits of the control chart in the updated first database, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control modes occurs, the measured value is determined to be the out-of-control point.
According to another aspect of the present invention, the present invention provides a metering supervision system of an electric energy meter automation verification system, the system comprising:
the stability assessment unit is used for carrying out a plurality of groups of measurements on the checking standard component for the first time by using a standard electric energy meter calibration device, and determining that the stability assessment of the checking standard component is qualified when the plurality of groups of measurements for the first time meet a stability criterion, wherein the checking standard component is a selected standard electric energy meter;
the first control chart unit is used for performing a plurality of groups of second measurements on the check standard component by using the standard electric energy meter verification device after the stability check of the check standard component is qualified, calculating an average value of the plurality of groups of second measurements as a reference value which is given to the check standard component by the standard electric energy meter verification device, establishing a first database of the check standard component according to the plurality of groups of measurement values, generating a first control chart based on the first database, performing one-time measurement on the check standard component by using the standard electric energy meter verification device when the system state judgment unit determines that an out-of-control point occurs in the new second control chart, automatically updating the new measurement value to the first database, and generating a new first control chart according to a method for generating the first control chart according to the measurement values of all the check standard components in the updated first database;
the standard element state judging unit is used for judging whether an out-of-control point occurs in a new first control diagram according to a preset control diagram out-of-control point judging rule, and when the out-of-control point occurs in the new first control diagram, determining that the checking standard element is damaged and replacing the new checking standard element;
the measurement capability assessment unit is used for carrying out a plurality of sets of measurements on the check standard component for the third time by using the electric energy automatic verification system, and determining that the measurement capability of the electric energy meter automatic verification system meets the measurement requirement when the plurality of sets of measurement values for the third time and the reference value meet the verification criterion of the electric energy meter automatic verification system capability;
the process control checking unit is used for performing a plurality of groups of measurement on the check standard part for the fourth time by using the automatic electric energy verification system after the measurement capability of the automatic electric energy meter verification system meets the measurement requirement, determining that the measurement process of the automatic electric energy meter verification system reaches a stable state when the measured values of the plurality of groups for the fourth time meet the steady state criterion of the automatic electric energy meter verification system in the measurement process, and determining that the automatic electric energy meter verification system works abnormally when the measurement process of the automatic electric energy meter verification system does not reach the steady state;
the second control chart unit is used for performing fifth times of groups of measurement on the check standard component by using the electric energy automatic verification system after the measurement process of the electric energy meter automatic verification system reaches a steady state, establishing a second database of the check standard component according to the fifth times of groups of measurement values, and generating a second control chart based on the second database; the electric energy meter automatic verification system automatically updates the new measurement value to a second database after measuring the check standard component for one time, and generates a new second control chart according to the method for generating the second control chart according to the measurement values of all the check standard components in the updated second database;
the system state judging unit is used for judging whether an out-of-control point occurs in a new second control chart according to a preset control chart out-of-control point judging rule, and when the out-of-control point does not occur in the new second control chart, the electric energy meter automatic verification system is determined to work normally; and when the measurement capability examination unit determines that the measurement capability of the automatic electric energy meter verification system does not meet the measurement requirement, or when the process control examination unit determines that the measurement process of the automatic electric energy meter verification system does not reach a steady state, or when an out-of-control point appears on the new second control chart and an out-of-control point does not appear on the new first control chart, determining that the automatic electric energy meter verification system works abnormally.
Further, the stability assessment unit comprises:
the first measuring unit is used for repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period;
a first calculation unit for recording the N-times measured values for each time interval as a set of measured values, and taking the arithmetic mean as the measured value y i ；
A first determination unit for determining the measured value y within the time period i Maximum value y of max And minimum value y min Judging the measured value y i Maximum value y of max And the minimum value y min Whether a criterion for checking the stability of the standard component is met, wherein the formula of the stability criterion is as follows:
|y max -y min |<|MPEV|
wherein MPEV is the maximum allowable error value of the corresponding preset load point;
when the measured value y i Maximum value y of max And the minimum value y min And when the absolute value of the difference is smaller than the maximum allowable error, the stability assessment is qualified.
Further, the first control map unit includes:
the second measuring unit is used for repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter verification device in a time period;
a second calculation unit for recording the N times of measurement value in each time interval as a group of measurement values, and calculating the average value of each group of measurement values
And standard deviation s N And calculating the mean of all groups of said check criteria in said time period>
Is based on the mean value->
And standard deviation s of the total number of groups N Is greater than or equal to>
And averaging the average values
Reference value y given to check standard component as standard electric energy meter calibrating device ref And based on said mean->
And the mean standard deviation->
And the number N of times that the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value/of each group of measured values of the check standard>
And standard deviation s N The upper control limit, the lower control limit and the center line have the calculation formula:
wherein, when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N,
are in each case the mean value of each measurement>
Upper control limit, centerline and lower control limit of (4), in conjunction with the control signal>
Standard deviation s for each set of measurements N Upper, center and lower control limits of (A) 3 、B 3 、B 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for N times according to a preset parameter corresponding table;
a first database unit for establishing a first database based on the measured values of the total number of sets of the check standard within a time period;
a first graphical unit for averaging each set of measurements of said check standard according to said time period
Is greater than or equal to the upper control limit>
Center line->
And a lower control limit>
Establishing a first mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period N Upper control limit->
Centre line>
And a lower control limit>
A first standard deviation control map is created, and a first standard deviation control map is created, the first control map including a first mean control map and a first standard deviation control map.
Further, the measurement capability assessment unit comprises:
a third measuring unit for performing a third plurality of sets of measurements on the checking standard piece as a blind sample by using the electric energy meter automatic verification system, wherein each set of measurements is performed once, and the measurement values are marked as y lab ；
A second judging unit for judging the measurement value y lab And the reference value y ref Whether the capacity verification criterion of the automatic verification system of the electric energy meter is met or not is determined, wherein the formula of the capacity verification criterion is as follows:
|y ref -y lab |≤U lab
in the formula of U lab Expanding uncertainty for a preset automatic calibration system of the electric energy meter;
when the reference value y ref And the measured value y lab The absolute value of the difference is less than the extension uncertainty U lab And meanwhile, determining that the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement.
Further, the process control assessment unit includes:
the fourth measuring unit is used for repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, and recording n times of measured values of each time interval as a group of measured values;
a third calculation unit for calculating an average value of each set of measurement values
And a range R and calculating the mean of all groups of said checking standard in said time period->
In a mean value of>
And the range R of the total number of groups n Is on average very poor->
According to said mean value>
And average pole difference->
And the standard electric energy meter calibrating device measures the times n of the standard checking component at each time interval, and respectively determines the average value of each group of measured values of the standard checking component
And extreme difference R n The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is n,
and &>
Are in each case the mean value of each measurement>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Respectively, the range R of each set of measured values n Upper, center line and lower control limits of (A) 2 、D 3 、D 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
a third judging unit for judging the average value of each group of measured values of the check standard component in the time period
And a control limit thereon->
Lower control limit->
Polar difference R n And control limits thereon>
Lower control limit
And a mean pole difference>
Whether the steady-state criterion of the automatic verification system of the electric energy meter in the measurement process is met or not is determined, wherein the steady-state criterion of the measurement process is determined by the following formula:
C pk ≥k
in the formula, C pk In order to be an index of the process capability,k is a preset process capability threshold, M is a tolerance center, the value is 0, mu is a mean value, T is a preset error limit amplitude, and d 2 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
when the calculated value of the process capability index is greater than or equal to a process capability threshold value and the average value of each group of measured values of the check standard component in the time period
And extreme difference R n When the measured values are all within the corresponding control limits, the fact that the measuring process of the automatic electric energy meter verification system reaches a steady state is determined, and when the measuring process of the automatic electric energy meter verification system does not reach the steady state, the fact that the automatic electric energy meter verification system works abnormally is determined.
Further, the second control chart unit includes:
a fifth measuring unit, configured to repeatedly measure the check standard component at preset time intervals by using a standard electric energy meter calibration device within a time period, and record t times of measured values at each time interval as a set of measured values;
a fourth calculation unit for calculating an average value of each set of measurement values
And standard deviation s t ；
Calculating the average value of all groups of the checking standard components in the time period
In a mean value of>
And standard deviation s of all groups t Is greater than or equal to>
Based on the mean value->
And an average standard deviation>
And the times t of measurement of the standard checking component by the standard electric energy meter calibrating device at each time interval respectively determine the average value of each group of measurement values of the checking standard component>
And standard deviation s t The upper control limit, the lower control limit and the center line have the calculation formula:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is t,
and &>
In each case as the mean of the measurement values of each group>
The upper limit of the control of (a) is, center line and lower control limit, <' > or>
And &>
Standard deviation s for each set of measurements t Upper, center line and lower control limit of (A) 3 、B 3 、B 4 The value is constant, and a value corresponding to the number of times that the standard electric energy meter calibrating device measures the check standard component at each time interval is t is taken according to a preset parameter corresponding table;
a second database unit for establishing a second database based on the measured values of all the groups of the check standard in the time period;
a second graphical unit for averaging each set of measurements of said check standard according to said time period
Upper control limit->
Center line->
And a lower control limit>
Establishing a second mean value control chart according to the standard element checking in the time periodStandard deviation s of each set of measurements t Is greater than or equal to the upper control limit>
Center line->
And a lower control limit>
A second standard deviation control map is established, which includes a second mean control map and a second standard deviation control map.
Further, the system state determination unit determining whether an out-of-control point of a new second control diagram occurs according to a preset control diagram out-of-control point determination rule includes:
judging whether an out-of-control point occurs in a new second standard deviation control chart and a new second mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new second standard deviation control chart or the new second standard deviation control chart has no out-of-control point and the new second mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new second control chart, and conversely, when the new second standard deviation control chart and the new second standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new second control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated second database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
Further, the judging whether the new first control diagram has the runaway point according to the preset control diagram runaway point judging rule by the standard element state judging unit comprises the following steps:
judging whether an out-of-control point occurs in a new first standard deviation control chart and a new first mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new first standard deviation control chart or the new first standard deviation control chart has no out-of-control point and the new first mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new first control chart, and conversely, when the new first standard deviation control chart and the new first standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new first control chart, wherein the control chart out-of-control point judgment rule refers to that a measured value does not fall within the upper and lower control limits of the control chart in the updated first database, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control modes occurs, the measured value is determined to be the out-of-control point.
The metering supervision method and the system of the electric energy meter automatic verification system provided by the technical scheme of the invention take a standard electric energy meter which passes stability examination as a check standard component, respectively establish a first control chart and a second control chart which are generated by repeatedly measuring the standard electric energy meter verification device and the electric energy meter automatic verification system, and check whether the control chart of the electric energy meter automatic verification system is abnormal or not through real-time control of the verification process of the electric energy meter automatic verification system and a preset check frequency, so that the verification quality of the detected electric energy meter in a certain time period or a certain batch can be monitored, the running state of the electric energy meter automatic verification system is ensured to be in a controllable range, and the problem that the traditional manual supervision management mode has hysteresis is solved; in addition, the invention respectively establishes a first database and a second database which are generated by repeatedly measuring the electric energy meter by using a standard electric energy meter calibrating device and an electric energy meter automatic calibrating system, ensures that the standard component to be checked and the electric energy meter automatic calibrating system are in a state of controllable statistics, can check the running state of the electric energy meter automatic calibrating system through two databases and a control chart at any time, and can realize paperless record management of measurement supervision.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of a method of meter supervision of an automatic verification system for electric energy meters according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a metering supervision system of an electric energy meter automatic verification system according to a preferred embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their context in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a meter supervision method of an electric energy meter automatic verification system according to a preferred embodiment of the present invention. As shown in fig. 1, a meter supervision method 100 of an electric energy meter automatic verification system according to the preferred embodiment starts with step 101.
In step 101, a standard electric energy meter is selected as a check standard. The selected checking standard component is a specially-made standard electric energy meter, the accuracy grade is 0.02 grade, the standard component has the same package with the electric energy meter to be installed, the external dimension meets the requirements of Q/GDW 1574-2014 technical Specification of an automatic verification system of the electric energy meter, the automation of standard checking from a vertical warehouse, verification and delivery can be completed through specific codes, the standard checking can randomly enter any bin, and the checking data can be uploaded to an MDS system.
In step 102, the standard electric energy meter calibrating device carries out a plurality of groups of measurements for the first time on the checking standard component, and when the plurality of groups of measurements for the first time meet the stability criterion, the checking standard component is determined to be qualified in stability check.
Preferably, the performing a plurality of first-time group measurements on the check standard component by using a standard electric energy meter calibration device, and when the plurality of first-time group measurements satisfy a stability criterion, determining that the check standard component is qualified in stability assessment includes:
repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, recording N times of measured values of each time interval as a group of measured values, and taking the arithmetic mean value of the measured values as the measured value y i ；
Determining the measured value y within the time period i Maximum value y of max And minimum value y min ；
Judging the measured value y i Maximum value y of max And the minimum value y min Whether a criterion for checking the stability of the standard component is met, wherein the formula of the stability criterion is as follows:
|y max -y min |<|MPEV|
in the formula, MPEV is the maximum allowable error value of the corresponding preset load point;
when the measured value y i Maximum value y of max And the minimum value y min And when the absolute value of the difference is smaller than the maximum allowable error, the stability assessment is qualified.
Specifically, a 0.02-level straight-through three-phase standard electric energy meter is selected as a check standard, stability check is performed on a 0.01-level three-phase electric energy meter calibrating device in a reference laboratory, 3 × 220V,3 × 60A and cos phi =1.0 are taken as examples, | MPEV | =0.02% is preset, 10 repeated measurements are performed on the electric energy meter on the first working day of each month, the arithmetic mean value of the electric energy values is taken as a measurement value, 6 groups of electric energy measurement values are obtained in total within half a year, and the maximum value y in the 6 groups of measurement values is max Minimum value y min Calculate | y max -y min |<And the stability assessment is qualified when the MPEV is in the state of | MPEV |.
In step 103, after the stability check of the check standard is qualified, the standard electric energy meter calibrating device is used for performing a plurality of groups of second measurements on the check standard, the average value of the plurality of groups of second measurements is calculated to be used as a reference value given to the check standard by the standard electric energy meter calibrating device, a first database of the check standard is established according to the plurality of groups of measurement values, and a first control chart is generated based on the first database.
Preferably, after the stability check of the check standard is qualified, performing a plurality of sets of measurements on the check standard by using the standard electric energy meter verification device for the second time, calculating an average value of the plurality of sets of measurements for the second time as a reference value given to the check standard by the standard electric energy meter verification device, establishing a first database of the check standard according to the plurality of sets of measurements, and generating a first control chart based on the first database includes:
in a time period, repeatedly measuring the check standard component by using a standard electric energy meter calibrating device according to a preset time interval, and recording N times of measured values of each time interval as a group of measured values;
establishing a first database according to the measured values of all groups of the checking standard components in the time period, and calculating the average value of the measured values of each group
And standard deviation s N ；
Calculating the average value of all groups of the checking standard components in the time period
In a mean value of>
And standard deviation s of the total number of groups N Is greater than or equal to>
And taking the mean value->
Reference value y given to check standard component as standard electric energy meter calibrating device ref ；
According to the average value
And the mean standard deviation->
And the standard electric energy meter calibrating device measures the times N of the checking standard component at each time interval, and respectively determines the average value of each group of measured values of the checking standard component
And standard deviation s N The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein, when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N,
are in each case the mean value of each measurement>
Upper, center line and lower control limit of (4), is greater than or equal to>
Standard deviation s of each set of measured values N Upper, center and lower control limits of (A) 3 、B 3 、B 4 The value is constant, and a corresponding numerical value is obtained when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N according to a preset parameter corresponding table;
according to the average value of each group of measured values of the checking standard component in the time period
Upper control limit of
Center line->
And a lower control limit>
Establishing a first mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period N Upper control limit>
Centre line>
And lower control limit
A first standard deviation control map is created, which includes a first mean control map and a first standard deviation control map.
Specifically, with a time period of 25 days as a subgroup for each day, 25 subgroups were made, and the number of times of repeated measurement for each subgroup N =5, the first database was established based on the measured values, and the average value of the electric energy values in each subgroup was calculated
And standard deviation s N Then an average value of the electrical energy values of the 25 subgroups is calculated>
Is based on the mean value->
And standard deviation s N Average standard deviation of->
Determining the mean value of each group of measured values based on a calculation formula>
And standard deviation s N And the center line, and plotting a first mean control map and a first standard deviation control map, wherein the mean->
The reference value y assigned to the checking standard component during the verification of the measuring capability of the electric energy meter automatic verification system ref According to GB/T4091-2001, the constants in the calculation formula take values of A3=1.427, B3=0, and B4=2.089 when N =5, in the conventional control chart.
In step 104, the electric energy automatic verification system performs a plurality of sets of measurement for the third time on the check standard component, and when the plurality of sets of measurement values for the third time and the reference value meet the verification criterion of the capacity of the electric energy meter automatic verification system, the electric energy meter automatic verification system is determined to meet the measurement requirement for the measurement capacity.
Preferably, the electric energy automatic verification system performs a third plurality of sets of measurements on the check standard component, and when the third plurality of sets of measurement values and the reference value satisfy an electric energy meter automatic verification system capability verification criterion, determining that the measurement capability of the electric energy meter automatic verification system satisfies the measurement requirement includes:
selecting the checking standard piece as a blind sample;
the electric energy meter automatic verification system conducts a plurality of sets of measurement for the third time on the checking standard component, wherein each set of measurement is conducted once, and the measured value is marked as y lab ；
Judging the measured value y lab And said reference value y ref Whether the capacity verification criterion meets the capacity verification criterion of the automatic verification system of the electric energy meter or not is determined, wherein the capacity verification criterion is determined by the following formula:
|y ref -y lab |≤U lab
in the formula of U lab Expanding uncertainty for a preset automatic calibration system of the electric energy meter;
when the reference value y ref And the measured value y lab The absolute value of the difference is less than the extension uncertainty U lab And meanwhile, determining that the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement.
Specifically, when the capacity verification is carried out on the automatic verification system of the electric energy meter, the expansion uncertainty U beneficial to the evaluation of the expansion uncertainty of the automatic verification system is given firstly lab The automatic verification system of the electric energy meter repeatedly measures the checking standard component for 10 times, and takes the measured electric energy value as an actual measurement value y lab The actual measured value y is compared with lab And the reference value y ref Substituting capability verification criteria to determine automatic verification of electric side meterWhether the system measurement capability meets the measurement requirements.
In step 105, after the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement, the automatic electric energy meter verification system performs a plurality of sets of measurements on the checking standard component for the fourth time, when the measured values of the plurality of sets for the fourth time meet the steady-state criterion of the automatic electric energy meter verification system, the automatic electric energy meter verification system is determined to reach the steady state in the measuring process, and when the automatic electric energy meter verification system does not reach the steady state in the measuring process, the automatic electric energy meter verification system is determined to work abnormally.
Preferably, after the measurement capability of the automatic calibration system for the electric energy meter meets the measurement requirement, the automatic calibration system for the electric energy meter performs a plurality of groups of measurements on the check standard component for the fourth time, and when the plurality of groups of measurements for the fourth time meet the steady-state criterion of the automatic calibration system for the electric energy meter in the measurement process, determining that the measurement process of the automatic calibration system for the electric energy meter reaches the steady state includes:
repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, recording n times of measured values of each time interval as a group of measured values, and calculating the average value of each group of measured values
And a range R;
calculating the average value of all groups of the checking standard components in the time period
Is based on the mean value->
And the mean pole deviation of the pole deviations R of all groups->
According to the average value
And a mean pole difference>
And the number n of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And extreme difference R n The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is n,
and &>
Are in each case the mean value of each measurement>
The upper limit of the control of (a) is, center line and lower control limit, <' > or>
And &>
Respectively, range R of each set of measured values n Upper, center line and lower control limit of (A) 2 、D 3 、D 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
judging the average value of each group of measured values of the check standard component in the time period
And its upper control limit
Under control limit>
Extreme difference R n And a control limit thereon->
Under control limit>
And on average pole difference->
Whether the steady-state criterion of the automatic verification system of the electric energy meter in the measurement process is met or not, wherein the formula of the steady-state criterion of the measurement processComprises the following steps:
C pk ≥k
in the formula, C pk Is a process capability index, k is a preset process capability threshold, M is a tolerance center, and is 0, mu is a mean value, T is a preset error limit amplitude, and d is a preset error limit amplitude 2 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
when the calculated value of the process capability index is greater than or equal to a process capability threshold value and the average value of each group of measured values of the check standard component in the time period
And extreme difference R n And when the measurement process of the automatic calibration system of the electric energy meter does not reach the steady state, determining that the automatic calibration system of the electric energy meter works abnormally.
Specifically, the automatic verification system for the electric energy meter takes 25 days as a time period and 1 day as a time interval, and one group of repeated measurements are carried out on the check standard part every day, wherein the number of the measurements n =5 in each group. Calculating check standard from a daily set of measurementsAverage value of (2)
And a very poor R according to the mean value of the daily amount->
Total mean of 25 days for Sum-polar R
And average pole difference->
Determining the mean value of each group of measured values based on a calculation formula>
According to GB/T4091-2001, when n =5, the constant value in the calculation formula is A 2 ＝0.577，d 2 =2.326. Finally according to the process capability index C pk When Cpk is more than or equal to 1.33, the process capability meets the requirement, the measurement process reaches a steady state, a statistical control state is carried out, and a control chart for control can be established. When Cpk is<And 1.33, the process capability of the automatic verification system of the electric energy meter is insufficient, verification work needs to be stopped, and maintenance and inspection are carried out on all links.
Corresponding evaluation periods must be set for verifying the measurement capability and the process capability of the automatic verification system of the electric energy meter, when the verification standard component meets the stability assessment requirement, for example, the operation of the steps 104 and 105 is repeated by taking the year as a unit, when the new data does not meet the criterion, the process control steady state is changed, the new steady state needs to be searched again, a second database is established again according to the steps 104 to 106 of the invention, and a second control chart is generated.
In step 106, after the measurement process of the automatic verification system for the electric energy meter reaches a steady state, the automatic verification system for the electric energy meter performs a fifth plurality of groups of measurements on the check standard component, establishes a second database of the check standard component according to the fifth plurality of groups of measurements, and generates a second control chart based on the second database.
Preferably, after the measurement process of the automatic verification system for the electric energy meter reaches a steady state, the electric energy automatic verification system performs a fifth plurality of groups of measurements on the verification standard component, establishes a second database of the verification standard component according to the fifth plurality of groups of measurements, and generates a second control chart based on the second database includes:
in a time period, repeatedly measuring the check standard component by using a standard electric energy meter calibrating device according to a preset time interval, and recording t times of measured values of each time interval as a group of measured values;
establishing a second database according to the measured values of all groups of the checking standard components in the time period, and calculating the average value of the measured values of each group
And standard deviation s t ；
Calculating the average value of all groups of the checking standard components in the time period
Is based on the mean value->
And standard deviation s of the total number of groups t Average standard deviation of->
According to the average value
And the mean standard deviation->
And the standard electric energy meter calibrating device is arranged at eachThe number t of times the measurement of the check standard is taken at a time interval, the mean value of each group of measured values of the check standard is determined in each case>
And standard deviation s t The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is t,
and &>
In each case as the mean of the measurement values of each group>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Standard deviation s for each set of measurements t Upper, center line and lower control limits of (A) 3 、B 3 、B 4 The value is constant, and a corresponding numerical value when the standard electric energy meter calibrating device measures the checking standard component at each time interval is t is taken according to a preset parameter corresponding table;
according to the average value of each group of measured values of the check standard component in the time period
Upper control limit
Centre line>
And a lower control limit>
Establishing a second mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period t Is greater than or equal to the upper control limit>
Centre line>
And lower control limit
Creating a second standard deviation control map, the second control map including a second mean control map and a second standard deviation control map。
In the preferred embodiment, the step of generating the second control chart is the same as the step of generating the first control chart except that the electric energy meter automatic verification system is used for repeated measurement of the check standard.
In step 107, the check standard component is transferred to an electric energy meter automatic verification system according to a preset check frequency, after the electric energy meter automatic verification system measures the check standard component for one time according to a fifth measurement method, the new measurement value is automatically updated to a second database to generate a new second control chart, and whether an out-of-control point occurs in the new second control chart is judged according to a preset control chart out-of-control point judgment rule.
Preferably, the transferring the check standard component to an electric energy meter automatic verification system according to a preset check frequency, after the electric energy meter automatic verification system measures the check standard component for one time according to a fifth measurement method, automatically updating the new measurement value to a second database to generate a new second control chart, and judging whether an out-of-control point occurs in the new second control chart according to a preset control chart out-of-control point judgment rule includes:
according to the preset checking frequency, after the checking time of the electric energy meter automatic checking system is reached, transferring the checking standard component to the electric energy meter automatic checking system;
the electric energy meter automatic verification system measures the standard component for one time according to the times t of each group of measurement when the standard component is measured for the fifth time, and updates the new measurement value to the second database;
generating a new second control chart according to the method for generating the second control chart according to the updated measured values of all the check standard elements in the second database, wherein the new second control chart comprises a new second mean control chart and a new second standard deviation control chart;
judging whether an out-of-control point occurs in a new second standard deviation control chart and a new second mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new second standard deviation control chart or the new second standard deviation control chart has no out-of-control point and the new second mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new second control chart, and conversely, when the new second standard deviation control chart and the new second standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new second control chart, wherein the control chart out-of-control point judgment rule refers to that a measured value does not fall within the upper and lower control limits of the control chart in the updated second database, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control modes occurs, the measured value is determined to be the out-of-control point.
In step 108, when the new second control chart does not have the out-of-control point, it is determined that the electric energy meter automatic verification system works normally.
In step 109, when the new second control chart has an out-of-control point, after a standard electric energy meter calibration device is used to measure the check standard component once, the new measurement value is automatically updated to the first database to generate a new first control chart, and whether the new first control chart has the out-of-control point is judged according to a preset control chart out-of-control point judgment rule.
Preferably, when the new second control chart has an out-of-control point, after the standard electric energy meter calibration device measures the check standard component for one time, automatically updating the new measurement value to the first database to generate a new first control chart, and judging whether the new first control chart has the out-of-control point according to a preset control chart out-of-control point judgment rule includes:
when an out-of-control point appears in a new second control chart, the check standard component is sent to a standard electric energy meter calibration device, the standard component is measured again for one time, and a new measurement group is updated to the first database;
generating a new first control chart according to the method for generating the first control chart according to the measurement values of all the check standard elements in the updated first database, wherein the new first control chart comprises a new first mean control chart and a new first standard deviation control chart;
judging whether an out-of-control point occurs in a new first standard deviation control chart and a new first mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new first standard deviation control chart or the new first standard deviation control chart has no out-of-control point and the new first mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new first control chart, and conversely, when the new first standard deviation control chart and the new first standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new first control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated first database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
In step 110, when the new second control diagram has an out-of-control point and the new first control diagram has an out-of-control point, it is determined that the check standard is damaged, and a new check standard is replaced.
In step 111, when the measurement capability of the automatic verification system of the electric energy meter does not meet the measurement requirement, or the measurement of the automatic verification system of the electric energy meter does not reach a steady state, or when an out-of-control point appears on the new second control chart and an out-of-control point does not appear on the new first control chart, it is determined that the automatic verification system of the electric energy meter works abnormally.
And (4) processing the second control chart abnormity, namely the occurrence of an out-of-control point, in two aspects, namely, checking that the standard component possibly has a problem, and automatically calibrating the electric energy meter to be in an out-of-control process state. For the first case, the judgment method is to reuse the standard electric energy meter verification device to perform a group of repeated measurements on the standard electric energy meter verification device, update the data to the first database, generate a new first control chart, and see whether the standard deviation and the average value of each group of measurement values of the standard element are within the upper and lower control limits of the control chart.
The inspection standard component should be subjected to weekly inspection according to the inspection period, and can be continuously used after the weekly inspection is qualified. The standard checking component is stored in an electric energy meter automatic verification system to verify a laboratory site at ordinary times, the checking frequency can be in ten days as a unit, the standard checking component is transferred to a standard electric energy meter verification device to perform a checking test every 10 days, data is automatically updated to a first control chart, and the checking frequency can also be based on actual requirements by taking the checked electric energy meter of each batch as a time interval.
Fig. 2 is a schematic structural diagram of a metering supervision system of an automatic verification system of an electric energy meter according to a preferred embodiment of the invention. As shown in fig. 2, the measurement supervision system 200 of the automatic verification system for an electric energy meter according to the preferred embodiment includes:
and the stability examination unit 201 is used for performing a plurality of groups of first-time measurements on the examination standard component by using a standard electric energy meter calibration device, and determining that the stability examination of the examination standard component is qualified when the plurality of groups of first-time measurements meet a stability criterion, wherein the examination standard component is a selected standard electric energy meter.
And the first control diagram unit 202 is used for performing a plurality of sets of measurements on the checking standard component for the second time by using the standard electric energy meter verification device after the checking standard component is qualified in stability check, calculating an average value of the plurality of sets of measurements for the second time to serve as a reference value given to the checking standard component by the standard electric energy meter verification device, establishing a first database of the checking standard component according to the plurality of sets of measurements, generating a first control diagram based on the first database, performing a measurement on the checking standard component by using the standard electric energy meter verification device once when the system state judgment unit determines that an out-of-control point occurs in the new second control diagram, automatically updating the new measurement value to the first database, and generating a new first control diagram according to a method for generating the first control diagram according to the updated measurement values of all the checking standard components in the first database.
And the standard element state judging unit 203 is used for judging whether an out-of-control point occurs in the new first control diagram according to a preset control diagram out-of-control point judging rule, and when the out-of-control point occurs in the new first control diagram, determining that the checking standard element is damaged and replacing the new checking standard element.
And the measurement capability assessment unit 204 is used for performing a plurality of sets of measurements on the check standard component for the third time by using the electric energy automatic verification system, and determining that the measurement capability of the electric energy meter automatic verification system meets the measurement requirement when the plurality of sets of measurement values for the third time and the reference value meet the capability verification criterion of the electric energy meter automatic verification system.
And the process control checking unit 205 is used for performing a plurality of groups of measurement for the fourth time on the check standard component by using the automatic electric energy verification system after the measurement capability of the automatic electric energy meter verification system meets the measurement requirement, determining that the measurement process of the automatic electric energy meter verification system reaches a stable state when the measured values of the plurality of groups for the fourth time meet the steady state criterion of the measurement process of the automatic electric energy meter verification system, and determining that the automatic electric energy meter verification system works abnormally when the measurement process of the automatic electric energy meter verification system does not reach the stable state.
The second control chart unit 206 is configured to, after the measurement process of the automatic electric energy meter verification system reaches a steady state, perform fifth several groups of measurements on the check standard by using the automatic electric energy meter verification system, establish a second database of the check standard according to the fifth several groups of measurements, and generate a second control chart based on the second database; and transferring the check standard component to an electric energy meter automatic verification system according to a preset check frequency, wherein the electric energy meter automatic verification system automatically updates the new measured value to a second database after measuring the check standard component for one time, and generates a new second control chart according to a method for generating a second control chart according to the measured values of all the check standard components in the updated second database.
The system state judging unit 207 is used for judging whether an out-of-control point occurs in a new second control chart according to a preset control chart out-of-control point judging rule, and when the out-of-control point does not occur in the new second control chart, determining that the electric energy meter automatic verification system works normally; and when the measurement capability examination unit determines that the measurement capability of the automatic electric energy meter verification system does not meet the measurement requirement, or when the process control examination unit determines that the measurement process of the automatic electric energy meter verification system does not reach a steady state, or when an out-of-control point appears on the new second control chart and an out-of-control point does not appear on the new first control chart, determining that the automatic electric energy meter verification system works abnormally.
Preferably, the stability assessment unit 201 includes:
a first measuring unit 211, configured to repeatedly measure, by using a standard electric energy meter calibrating device, the check standard component at a preset time interval within a time period;
a first calculation unit 212 for recording the N times of the measured values for each time interval as a set of measured values, taking the arithmetic mean thereof as the measured value y i ；
A first determining unit 213 for determining the measured value y within the time period i Maximum value y of max And minimum value y min Judging the measured value y i Maximum value y of max And minimum value y min Whether a criterion for checking the stability of the standard component is met, wherein the formula of the stability criterion is as follows:
|y max -y min |<|MPEV|
in the formula, MPEV is the maximum allowable error value of the corresponding preset load point;
when the measured value y is i Maximum value y of max And the minimum value y min And when the absolute value of the difference is smaller than the maximum allowable error, the stability assessment is qualified.
Preferably, the first control chart unit 202 includes:
the second measuring unit 221 is used for repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period;
a second calculating unit 222 for recording the N measured values of each time interval as a set of measured values, calculating an average value of each set of measured values
And standard deviation s N And calculating the checking standard component in the time periodMean value of all groups->
Is based on the mean value->
And standard deviation s of all groups N Is greater than or equal to>
And averaging said average
Reference value y given to check standard component as standard electric energy meter calibrating device ref And based on said mean->
And an average standard deviation>
And the times N of measurement of the standard checking standard component by the standard electric energy meter verification device at each time interval respectively determine the average value in the range of each group of measurement values of the checking standard component>
And standard deviation s N Upper part of
In the formula, when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N,
in each case as the mean of the measurement values of each group>
Upper, center line and lower control limit of (4), is greater than or equal to>
Standard deviation s for each set of measurements N Upper, center and lower control limits of A 3 、B 3 、B 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for N times according to a preset parameter corresponding table;
a first database unit 223 for establishing a first database based on the measured values of the total number of sets of the check standard members in one time period;
a first graphical unit 224 for averaging each set of measurements of said check standard according to said time period
Is greater than or equal to the upper control limit>
Center line->
And a lower control limit>
Establishing a first mean value control chart, and checking according to the time periodStandard deviation s of each set of measurements of the standard N Upper control limit->
Center line
And a lower control limit>
A first standard deviation control map is created, which includes a first mean control map and a first standard deviation control map.
Preferably, the measurement capability assessment unit 204 includes:
a third measuring unit 241, configured to perform a third plurality of sets of measurements on the standard inspection piece as a blind sample by using the electric energy meter automatic verification system, where each set of measurements is performed once, and the measurement values are denoted as y lab ；
A second judging unit 242 for judging the measurement value y lab And the reference value y ref Whether the capacity verification criterion of the automatic verification system of the electric energy meter is met or not is determined, wherein the formula of the capacity verification criterion is as follows:
|y ref -y lab |≤U lab
in the formula of U lab Expanding uncertainty for a preset automatic calibration system of the electric energy meter;
when the reference value y ref And the measured value y lab The absolute value of the difference is less than the extension uncertainty U lab And meanwhile, determining that the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement.
Preferably, the process control assessment unit 205 includes:
a fourth measuring unit 251, configured to repeatedly measure the check standard component at preset time intervals by using a standard electric energy meter calibrating device during a time period, and record n times of measured values at each time interval as a set of measured values;
third calculating Unit 252 for calculating an average of each set of measurements
And a pole difference R, and calculating the mean of all groups of the check standard in the time period->
In a mean value of>
And the range R of the total number of groups n Is on average very poor->
Based on the mean value->
And average pole difference->
And the number n of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And extreme difference R n The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measuring the check standard piece by the standard electric energy meter verification device at each time interval is n,
and &>
Are in each case the mean value of each measurement>
The upper limit of the control of (a) is, center line and lower control limit, <' > or>
And &>
Respectively, range R of each set of measured values n Upper, center line and lower control limit of (A) 2 、D 3 、D 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
a third judging unit 253 for judging the average value of each group of measured values of the check standard within the time period
And a control limit thereon->
Lower control limit->
Extreme difference R n And a control limit thereon->
Lower control limit
And on average pole difference->
Whether the steady-state criterion of the automatic verification system of the electric energy meter in the measurement process is met or not is determined, wherein the steady-state criterion of the measurement process is determined by the following formula:
C pk ≥k
in the formula, C pk Is a process capability index, k is a preset process capability threshold, M is a tolerance center, and is 0, mu is a mean value, T is a preset error limit amplitude, and d is a preset error limit amplitude 2 Is constant, the value is according to the preset parameter corresponding table, and the time when the standard electric energy meter calibrating device is at each time is takenThe corresponding numerical value when the number of times of measuring the check standard component at intervals is n;
when the calculated value of the process capability index is larger than or equal to a process capability threshold value and the average value of each group of measured values of the check standard component in the time period
And extreme difference R n When the measured values are all within the corresponding control limits, the fact that the measuring process of the automatic electric energy meter verification system reaches a steady state is determined, and when the measuring process of the automatic electric energy meter verification system does not reach the steady state, the fact that the automatic electric energy meter verification system works abnormally is determined.
Preferably, the second control map unit 206 includes:
a fifth measuring unit 261, configured to repeatedly measure the check standard component at preset time intervals by using a standard electric energy meter calibration apparatus within a time period, and record t measured values at each time interval as a set of measured values;
a fourth calculating unit 262 for calculating an average value of each set of measured values
And standard deviation s t ；
Calculating the average value of all groups of the checking standard components in the time period
Is based on the mean value->
And standard deviation s of all groups t Is greater than or equal to>
Based on the mean value->
And an average standard deviation>
And the number t of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And standard deviation s t The upper control limit, the lower control limit and the center line have the calculation formula:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is t,
and &>
In each case as the mean of the measurement values of each group>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Standard deviation s for each set of measurements t Upper control limit, center line and lower control limit, A 3 、B 3 、B 4 The value is constant, and a value corresponding to the number of times that the standard electric energy meter calibrating device measures the check standard component at each time interval is t is taken according to a preset parameter corresponding table; />
A second database unit 263, configured to establish a second database according to the measured values of all the sets of the check standard in the time period;
a second graphic unit 264 for averaging each set of measurements of said check standard according to said time period
Upper control limit->
Centre line>
And a lower control limit>
Establishing a second mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period t Is greater than or equal to the upper control limit>
Center line
And a lower control limit>
A second standard deviation control map is created, which includes a second mean control map and a second standard deviation control map.
Preferably, the determining, by the system state determining unit 207, whether an out-of-control point of a new second control diagram occurs according to a preset control diagram out-of-control point determination rule includes:
judging whether an out-of-control point occurs in a new second standard deviation control chart and a new second mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new second standard deviation control chart or the new second standard deviation control chart has no out-of-control point and the new second mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new second control chart, and conversely, when the new second standard deviation control chart and the new second standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new second control chart, wherein the control chart out-of-control point judgment rule refers to that a measured value does not fall within the upper and lower control limits of the control chart in the updated second database, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control modes occurs, the measured value is determined to be the out-of-control point.
Preferably, the judging, by the standard condition judging unit 203, whether the runaway point of the new first control diagram occurs according to a preset control diagram runaway point judging rule includes:
judging whether an out-of-control point occurs in a new first standard deviation control chart and a new first mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new first standard deviation control chart or the new first standard deviation control chart has no out-of-control point and the new first mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new first control chart, and conversely, when the new first standard deviation control chart and the new first standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new first control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated first database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
The method for monitoring the metering of the automatic electric energy meter calibration system by the metering monitoring system of the automatic electric energy meter calibration system has the same steps and the same technical effects as the metering monitoring method of the automatic electric energy meter calibration system, and is not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ means, component, etc ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. A metering supervision method of an automatic verification system of an electric energy meter is characterized by comprising the following steps:
selecting a standard electric energy meter as a checking standard component;
carrying out a plurality of groups of measurement for the first time on the checking standard component by using a standard electric energy meter calibrating device, and determining that the checking standard component is qualified in stability check when the plurality of groups of measurement values for the first time meet the stability criterion;
when the stability of the checking standard component is qualified, performing a plurality of groups of measurements on the checking standard component for the second time by using the standard electric energy meter verification device, calculating the average value of the plurality of groups of measurements for the second time as a reference value given to the checking standard component by the standard electric energy meter verification device, establishing a first database of the checking standard component according to the plurality of groups of measurement values, and generating a first control chart based on the first database;
the automatic verification system of electric energy carries out a plurality of groups of measurement of the third time to the check standard component, when a plurality of groups of measured values of the third time with the reference value satisfies the automatic verification system capability verification criterion of electric energy meter, confirms that the automatic verification system measurement capability of electric energy meter satisfies the measurement demand, include:
selecting the checking standard as a blind sample;
the electric energy meter automatic verification system carries out a plurality of sets of measurement for the third time on the check standard component, wherein each set of measurement is carried out once, and the measurement value is recorded as y lab ；
Judging the measured value y lab And the reference value y ref Whether the capacity verification criterion of the automatic verification system of the electric energy meter is met or not is determined, wherein the formula of the capacity verification criterion is as follows:
|y ref -y lab |≤U lab
in the formula of U lab Expanding uncertainty for a preset automatic calibration system of the electric energy meter;
when the reference value y ref And the measured value y lab The absolute value of the difference is less than the extension uncertainty U lab Determining that the measurement capability of the automatic verification system of the electric energy meter meets the measurement requirement;
when the measuring capacity of the automatic electric energy meter verification system meets the measuring requirement, the automatic electric energy verification system performs a plurality of groups of measurements for the fourth time on the check standard component, and when the measured values of the plurality of groups for the fourth time meet the steady-state criterion of the automatic electric energy meter verification system in the measuring process, the automatic electric energy meter verification system is determined to reach the steady state in the measuring process;
when the measuring process of the electric energy meter automatic verification system reaches a steady state, the electric energy automatic verification system carries out a plurality of groups of fifth measurement on the check standard component, establishes a second database of the check standard component according to the plurality of groups of fifth measurement, and generates a second control chart based on the second database;
transferring the check standard component to an electric energy meter automatic verification system according to a preset check frequency, automatically updating a new measurement value to a second database to generate a new second control chart after the electric energy meter automatic verification system measures the check standard component for one time, and judging whether the new second control chart has an out-of-control point according to a preset control chart out-of-control point judgment rule;
when the new second control chart does not have an out-of-control point, determining that the automatic verification system of the electric energy meter works normally;
when the new second control chart has an out-of-control point, after the standard electric energy meter calibrating device is used for measuring the check standard component for one time, the new measurement value is automatically updated to the first database to generate a new first control chart, and whether the new first control chart has the out-of-control point is judged according to a preset control chart out-of-control point judgment rule;
when an out-of-control point appears on the new second control diagram and an out-of-control point appears on the new first control diagram, determining that the checking standard component is damaged, and replacing the new checking standard component;
and when the measurement capability of the automatic verification system of the electric energy meter does not meet the measurement requirement, or when the measurement process of the automatic verification system of the electric energy meter does not reach a steady state, or when an out-of-control point appears on the new second control chart and an out-of-control point does not appear on the new first control chart, determining that the automatic verification system of the electric energy meter works abnormally.
2. The method of claim 1, wherein the first plurality of sets of measurements of the verification standard are performed using a standard electric energy meter certification device, and wherein determining that the verification standard is qualified for stability when the first plurality of sets of measurements satisfy a stability criterion comprises:
repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, recording N times of measured values of each time interval as a group of measured values, and taking the arithmetic mean value of the measured values as the measured value y i ；
Determining the measured value y within the time period i Maximum value y of max And minimum value y min ；
Judging the measured value y i Maximum value y of max And the minimum value y min Whether a criterion for checking the stability of the standard component is met, wherein the formula of the criterion for stability is as follows:
|y max -y min |<|MPEV|
wherein MPEV is the maximum allowable error value of the corresponding preset load point;
when the measured value y i Maximum value y of max And minimum value y min And when the absolute value of the difference is smaller than the maximum allowable error, the stability assessment is qualified.
3. The method of claim 1, wherein after the checking of the standard component for stability is qualified, performing a second plurality of sets of measurements on the checking standard component by using the standard electric energy meter verification device, calculating an average value of the second plurality of sets of measurements as a reference value assigned to the checking standard component by the standard electric energy meter verification device, establishing a first database of the checking standard component according to the plurality of sets of measurements, and generating a first control chart based on the first database comprises:
in a time period, repeatedly measuring the check standard component by using a standard electric energy meter calibrating device according to a preset time interval, and recording N times of measured values of each time interval as a group of measured values;
establishing a first database according to the measured values of all groups of the checking standard components in the time period, and calculating the average value of the measured values of each group
And standard deviation s N ；
Calculating the average value of all groups of the check standard component in the time period
Is based on the mean value->
And standard deviation s of all groups N Is greater than or equal to>
And combining said average value>
Reference value y given to check standard component as standard electric energy meter calibrating device ref ；
According to the average value
And the mean standard deviation->
And the number N of times that the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value/of each group of measured values of the check standard>
And standard deviation s N The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
in the formula, when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N,
are in each case the mean value of each measurement>
Upper, center line and lower control limit of (4), is greater than or equal to>
Standard deviation s of each set of measured values N Upper control ofLimit, center line and lower control limit, A 3 、B 3 、B 4 The value is constant, and a corresponding numerical value is obtained when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N according to a preset parameter corresponding table;
according to the average value of each group of measured values of the check standard component in the time period
Upper control limit of
Centre line>
And a lower control limit>
Establishing a first mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period N Upper control limit>
Center line->
And lower control limit
A first standard deviation control map is created, which includes a first mean control map and a first standard deviation control map.
4. The method of claim 1, wherein the power meter automated verification system performs a fourth plurality of measurements on the check standard after the measurement capability of the power meter automated verification system meets the measurement requirement, and determines that the power meter automated verification system measurement process reaches a steady state when the fourth plurality of measurements meets the power meter automated verification system measurement process steady state criterion comprises:
repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, recording n times of measured values of each time interval as a group of measured values, and calculating the average value of each group of measured values
And extreme difference R n ；
Calculating the average value of all groups of the check standard component in the time period
In a mean value of>
And the range R of the total number of groups n Average pole difference of->
According to the average value
And a mean pole difference>
And the number n of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And extreme difference R n The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measuring the check standard piece by the standard electric energy meter verification device at each time interval is n,
and &>
In each case as the mean of the measurement values of each group>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Respectively, range R of each set of measured values n Upper, center line and lower control limit of (A) 2 、D 3 、D 4 The value is constant, and a corresponding numerical value is obtained when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is n according to a preset parameter corresponding table;
judging the average value of each group of measured values of the check standard component in the time period
And its upper control limit
Under control limit>
Extreme difference R n And control limits thereon>
Under control limit>
And on average pole difference->
Whether the steady-state criterion of the automatic verification system of the electric energy meter in the measurement process is met or not is determined, wherein the steady-state criterion of the measurement process is determined by the following formula:
C pk ≥k
in the formula, C pk Is a process capability index, k is a preset process capability threshold, M is a tolerance center, and is 0, mu is a mean value, T is a preset error limit amplitude, and d is a preset error limit amplitude 2 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
when the calculated value of the process capability index is greater than or equal to a process capability threshold value and the average value of each group of measured values of the check standard component in the time period
And extreme difference R n And when the measurement process of the automatic calibration system of the electric energy meter does not reach the steady state, determining that the automatic calibration system of the electric energy meter works abnormally.
5. The method of claim 1, wherein after the electric energy meter automated verification system measurement process reaches a steady state, the electric energy automated verification system performs a fifth plurality of sets of measurements on the check standard, establishes a second database of the check standard according to the fifth plurality of sets of measurements, and generates a second control chart based on the second database, the method comprising:
in a time period, repeatedly measuring the checking standard component by using a standard electric energy meter calibrating device according to a preset time interval, and recording t times of measured values of each time interval as a group of measured values;
establishing a second database according to the measured values of all groups of the checking standard components in the time period, and calculating the average value of the measured values of each group
And standard deviation s t ；
Calculating the average value of all groups of the check standard component in the time period
In a mean value of>
And standard deviation s of the total number of groups t Is greater than or equal to>
According to the average value
And an average standard deviation>
And the number t of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And standard deviation s t The upper control limit, the lower control limit and the center line have the calculation formula:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is t,
and &>
Are in each case the mean value of each measurement>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Standard deviation s for each set of measurements t Upper, center line and lower control limit of (A) 3 、B 3 、B 4 The value is constant, and a value corresponding to the number of times that the standard electric energy meter calibrating device measures the check standard component at each time interval is t is taken according to a preset parameter corresponding table;
according to the average value of each group of measured values of the checking standard component in the time period
Upper control limit>
Centre line>
And a lower control limit>
Establishing a second mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period t Is greater than or equal to the upper control limit>
Center line->
And a lower control limit>
A second standard deviation control map is created, which includes a second mean control map and a second standard deviation control map.
6. The method of claim 5, wherein the step of transferring the check standard component to an automatic electric energy meter verification system according to a preset check frequency, the automatic electric energy meter verification system automatically updates a new measurement value to a second database to generate a new second control chart after performing a measurement on the check standard component, and the step of judging whether an out-of-control point occurs in the new second control chart according to a preset control chart out-of-control point judgment rule comprises:
according to the preset checking frequency, after the checking time of the electric energy meter automatic checking system is reached, the checking standard piece is transferred to the electric energy meter automatic checking system, the checking standard piece is measured for one time, and the new measurement value is updated to a second database;
generating a new second control chart according to the method for generating the second control chart according to the updated measured values of all the check standard elements in the second database, wherein the new second control chart comprises a new second mean control chart and a new second standard deviation control chart;
judging whether an out-of-control point occurs in a new second standard deviation control chart and a new second mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new second standard deviation control chart or the new second standard deviation control chart has no out-of-control point and the new second mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new second control chart, and conversely, when the new second standard deviation control chart and the new second standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new second control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated second database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
7. The method of claim 3, wherein when the new second control chart has an out-of-control point, after a standard electric energy meter calibrating device measures the check standard, the new measurement value is automatically updated to the first database to generate a new first control chart, and the determining whether the new first control chart has the out-of-control point according to a preset control chart out-of-control point determining rule includes:
when an out-of-control point occurs in a new second control chart, sending the checked standard component to a standard electric energy meter verification device, measuring the standard component again, updating a new measurement value to the first database, and generating a new first control chart according to the method for generating the first control chart according to the measurement values of all the checked standard components in the updated first database, wherein the new first control chart comprises a new first mean control chart and a new first standard deviation control chart;
judging whether an out-of-control point occurs in a new first standard deviation control chart and a new first mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new first standard deviation control chart or the new first standard deviation control chart has no out-of-control point and the new first mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new first control chart, and conversely, when the new first standard deviation control chart and the new first standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new first control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated first database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
8. A metering supervision system of an electric energy meter automatic verification system is characterized by comprising:
the stability assessment unit is used for carrying out a plurality of groups of measurements on a checking standard component for the first time by using a standard electric energy meter calibration device, and determining that the stability assessment of the checking standard component is qualified when the plurality of groups of measurements for the first time meet a stability criterion, wherein the checking standard component is a selected standard electric energy meter;
the first control chart unit is used for performing a plurality of groups of second measurements on the check standard component by using the standard electric energy meter verification device after the stability check of the check standard component is qualified, calculating the average value of the plurality of groups of second measurements as a reference value which is given to the check standard component by the standard electric energy meter verification device, establishing a first database of the check standard component according to the plurality of groups of measurement values, generating a first control chart based on the first database, performing one measurement on the check standard component by using the standard electric energy meter verification device when the system state judgment unit determines that a new second control chart has an out-of-control point, automatically updating the new measurement value to the first database, and generating a new first control chart according to a method for generating the first control chart according to the updated measurement values of all the check standard components in the first database;
the standard element state judging unit is used for judging whether an out-of-control point occurs in a new first control diagram according to a preset control diagram out-of-control point judging rule, and when the out-of-control point occurs in the new first control diagram, determining that the checking standard element is damaged and replacing the new checking standard element;
the measurement capability assessment unit is used for utilizing the electric energy automatic verification system to carry out a plurality of sets of measurement for the third time on the check standard component, and when the plurality of sets of measurement values for the third time and the reference value meet the capability verification criterion of the electric energy meter automatic verification system, determining that the measurement capability of the electric energy meter automatic verification system meets the measurement requirement, and comprises the following steps:
a third measuring unit for performing a third plurality of sets of measurements on the checking standard piece as a blind sample by using the electric energy meter automatic verification system, wherein each set of measurements is performed once, and the measurement values are marked as y lab ；
A second judgment unit for judging the measurement value y lab And the reference value y ref Whether the capacity verification criterion of the automatic verification system of the electric energy meter is met or not is determined, wherein the formula of the capacity verification criterion is as follows:
|y ref -y lab |≤U lab
in the formula of U lab Expanding uncertainty for a preset automatic calibration system of the electric energy meter;
when the reference value y ref And the measured value y lab The absolute value of the difference is less than the extension uncertainty U lab Determining the self of the electric energy meterThe measuring capacity of the dynamic verification system meets the measuring requirement;
the process control checking unit is used for carrying out a plurality of groups of measurements for the fourth time on the check standard component by using the electric energy automatic verification system after the measurement capability of the electric energy meter automatic verification system meets the measurement requirement, and determining that the measurement process of the electric energy meter automatic verification system reaches a steady state when the measured values of the plurality of groups for the fourth time meet the steady state criterion of the measurement process of the electric energy meter automatic verification system;
the second control chart unit is used for performing fifth times of groups of measurement on the check standard component by using the electric energy automatic verification system after the measurement process of the electric energy meter automatic verification system reaches a steady state, establishing a second database of the check standard component according to the fifth times of groups of measurement values, and generating a second control chart based on the second database; transferring the check standard component to an electric energy meter automatic verification system according to preset check frequency, automatically updating a new measurement value to a second database after the electric energy meter automatic verification system measures the check standard component for one time, and generating a new second control chart according to a method for generating a second control chart and the measurement values of all the check standard components in the updated second database;
the system state judging unit is used for judging whether an out-of-control point occurs in a new second control chart according to a preset control chart out-of-control point judging rule, and when the out-of-control point does not occur in the new second control chart, the electric energy meter automatic verification system is determined to work normally; and when the measurement capability examination unit determines that the measurement capability of the automatic verification system of the electric energy meter does not meet the measurement requirement, or when the process control examination unit determines that the measurement process of the automatic verification system of the electric energy meter does not reach a steady state, or when the new second control diagram has an out-of-control point and the new first control diagram does not have an out-of-control point, determining that the automatic verification system of the electric energy meter works abnormally.
9. The system of claim 8, wherein the stability assessment unit comprises:
the first measuring unit is used for repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period;
a first calculation unit for recording the N times of measurement value as a group of measurement values, and taking the arithmetic mean value as the measurement value y i ；
A first determination unit for determining the measured value y within the time period i Maximum value y of max And minimum value y min Judging the measured value y i Maximum value y of max And minimum value y min Whether a criterion for checking the stability of the standard component is met, wherein the formula of the criterion for stability is as follows:
|y max -y min |<|MPEV|
in the formula, MPEV is the maximum allowable error value of the corresponding preset load point;
when the measured value y is i Maximum value y of max And the minimum value y min And when the absolute value of the difference is smaller than the maximum allowable error, the stability assessment is qualified.
10. The system of claim 8, wherein the first control chart unit comprises:
the second measuring unit is used for repeatedly measuring the check standard component at preset time intervals by using a standard electric energy meter verification device in a time period;
a second calculation unit for recording the N times of measurement value in each time interval as a group of measurement values, and calculating the average value of each group of measurement values
And standard deviation s N And calculating the average value of all groups of the check standard component in the time period
In a mean value of>
And standard deviation s of the total number of groups N Is greater than or equal to>
And taking the mean value->
Reference value y given to check standard component as standard electric energy meter calibrating device ref And according to said mean value>
And the mean standard deviation->
And the number N of times that the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value/of each group of measured values of the check standard>
And standard deviation s N The upper control limit, the lower control limit and the center line have the calculation formula:
wherein, when the number of times of measuring the check standard component by the standard electric energy meter calibrating device at each time interval is N,
are in each case the mean value of each measurement>
Upper, center line and lower control limit of (4), is greater than or equal to>
Standard deviation s of each set of measured values N Upper, center and lower control limits of (A) 3 、B 3 、B 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for N times according to a preset parameter corresponding table;
a first database unit for establishing a first database based on the measured values of the total number of sets of the check standard within a time period;
a first graphical unit for averaging each set of measurements of said check standard according to said time period
Upper control limit of (4)>
Center line->
And a lower control limit>
Establishing a first mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period N Upper control limit->
Centre line>
And a lower control limit>
A first standard deviation control map is created, which includes a first mean control map and a first standard deviation control map.
11. The system of claim 9, wherein the process control qualification unit comprises:
the fourth measuring unit is used for repeatedly measuring the checking standard component at preset time intervals by using a standard electric energy meter calibrating device in a time period, and recording n times of measured values of each time interval as a group of measured values;
a third calculation unit for calculating an average value of each set of measurement values
And a range R and calculating the mean of all groups of said checking standard in said time period->
Is based on the mean value->
And the range R of the total number of groups n Is on average very poor->
Based on the mean value->
And average pole difference->
And the times n of measurement of the standard checking standard component by the standard electric energy meter verification device in each time interval are respectively determined, and the average value of each group of measurement values of the checking standard component is determined>
And extreme difference R n The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein when the number of times of measurement of the standard electric energy meter verification device on the check standard component at each time interval is n,
and &>
Are in each case the mean value of each measurement>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Respectively, the range R of each set of measured values n Upper, center line and lower control limits of (A) 2 、D 3 、D 4 The value is constant, and a corresponding numerical value is obtained when the standard electric energy meter calibrating device measures the checking standard component at each time interval for n times according to a preset parameter corresponding table;
a third judging unit for judging the average value of each group of measured values of the check standard component in the time period
And control limits thereon>
Under control limit>
Extreme difference R n And a control limit thereon->
Lower control limit
And a mean pole difference>
Whether the steady-state criterion of the automatic verification system of the electric energy meter in the measurement process is met or not is determined, wherein the steady-state criterion of the measurement process is determined by the following formula:
C pk ≥k
in the formula, C pk Is a process capability index, k is a preset process capability threshold, M is a tolerance center, and is 0, mu is a mean value, T is a preset error limit amplitude, and d is a preset error limit amplitude 2 Is constant, the value is according to the preset parameter corresponding table, and the time when the standard electric energy meter calibrating device is at each time is takenThe corresponding numerical value when the number of times of measuring the check standard component at intervals is n;
when the calculated value of the process capability index is greater than or equal to a process capability threshold value and the average value of each group of measured values of the check standard component in the time period
And extreme difference R n And when the measurement process of the automatic calibration system of the electric energy meter does not reach the steady state, determining that the automatic calibration system of the electric energy meter works abnormally.
12. The system of claim 8, wherein the second control map unit comprises:
a fifth measuring unit, configured to repeatedly measure the check standard component at preset time intervals by using a standard electric energy meter calibration device within a time period, and record t times of measured values at each time interval as a set of measured values;
a fourth calculation unit for calculating an average value of each set of the measured values
And standard deviation s t ；
Calculating the average value of all groups of the check standard component in the time period
In a mean value of>
And standard deviation s of the total number of groups t Average standard deviation of->
Based on the mean value->
And an average standard deviation>
And the number t of times the standard electric energy meter calibrating device measures the check standard at each time interval respectively determines the mean value ^ or the mean value ^ of each group of measured values of the check standard>
And standard deviation s t The upper control limit, the lower control limit and the center line, and the calculation formula is as follows:
wherein, when the standard electric energy meter calibrating device checks the standard component at each time intervalWhen the number of measurements is t,
and &>
Are in each case the mean value of each measurement>
Upper control limit, centerline and lower control limit, based on a predetermined threshold value>
And &>
Standard deviation s for each set of measurements t Upper, center line and lower control limit of (A) 3 、B 3 、B 4 The value is constant, and a corresponding numerical value when the standard electric energy meter calibrating device measures the checking standard component at each time interval is t is taken according to a preset parameter corresponding table;
a second database unit for establishing a second database based on the measured values of all the groups of the check standard in the time period;
a second graphical unit for averaging each set of measurements of said check standard according to said time period
Upper control limit>
Centre line>
And a lower control limit>
Establishing a second mean value control chart, and checking the standard deviation s of each group of measured values of the standard component in the time period t Is greater than or equal to the upper control limit>
Center line->
And a lower control limit>
A second standard deviation control map is established, which includes a second mean control map and a second standard deviation control map.
13. The system of claim 11, wherein the system state determination unit determining whether an runaway point occurs in the new second control map according to a preset control map runaway point determination rule comprises:
judging whether an out-of-control point occurs in a new second standard deviation control chart and a new second mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new second standard deviation control chart or the new second standard deviation control chart has no out-of-control point and the new second mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new second control chart, and conversely, when the new second standard deviation control chart and the new second standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new second control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated second database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
14. The system of claim 9, wherein the standard condition determining unit determining whether the runaway point of the new first control chart occurs according to a preset control chart runaway point determination rule comprises:
judging whether an out-of-control point occurs in a new first standard deviation control chart and a new first mean control chart according to a preset control chart out-of-control point judgment rule, when the out-of-control point occurs in the new first standard deviation control chart or the new first standard deviation control chart has no out-of-control point and the new first mean control chart has an out-of-control point, determining that the out-of-control point occurs in the new first control chart, and conversely, when the new first standard deviation control chart and the new first standard deviation control chart have no out-of-control point, determining that the out-of-control point does not occur in the new first control chart, wherein the control chart out-of-control point judgment rule refers to that in the updated first database, the measured value does not fall within the upper and lower control limits of the control chart, or the measured value does not randomly distribute around the center line of the control chart, and when any one of preset out-of-control patterns occurs, the measured value is determined to be the out-of-control point.
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| CN112213686A (en) * | 2020-08-27 | 2021-01-12 | 国网山东省电力公司日照供电公司 | Checking system of automatic calibrating device of electric energy meter |
| CN114167335B (en) * | 2020-09-10 | 2022-10-18 | 长鑫存储技术有限公司 | Qualification inspection method and system for newly added detection tool |
| US11994837B2 (en) | 2020-09-10 | 2024-05-28 | Changxin Memory Technologies, Inc. | Acceptability check method and check system for newly-added production tools |
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