CN116699499B - Ammeter precision and reliability automatic detection system - Google Patents
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Abstract
The invention relates to the field of ammeter detection and discloses an ammeter precision and reliability automatic detection system.
Description
Technical Field
The invention relates to the field of ammeter detection, in particular to an ammeter precision and reliability automatic detection system.
Background
The ammeter is an abbreviation of electric energy meter, is a meter for measuring electric energy, also called an electric meter, a fire meter, an electric energy meter and a kilowatt hour meter, and refers to a meter for measuring various electric quantities.
In the using process of the ammeter, the phenomena of damage, reduced measuring precision and the like are unavoidable; in order to ensure that the metering of the smart meter meets the standard, the qualification of the smart meter is checked regularly when in use, and the error of the smart meter is essential to be measured.
At present, the precision detection of ammeter all is that the staff goes on-the-spot to examine, because the ammeter quantity of a district is more, and manual spot examination is very time-consuming and laborious, moreover, manual spot examination still can appear the error, and unable accurate judgement ammeter precision is not on time, is because ammeter self ageing cause ammeter precision inaccurate, and is external environmental factor, for example: electricity theft results in inaccurate meter accuracy.
Disclosure of Invention
The invention aims to provide an automatic detection system for the accuracy and reliability of an ammeter, which solves the technical problems.
The aim of the invention can be achieved by the following technical scheme:
an automatic detection system for accuracy and reliability of an electric meter, comprising:
the data acquisition module is used for monitoring the electricity consumption parameters of the current station area;
the electricity consumption parameters comprise power consumption of the transformer area, power consumption of the transformer area and power supply of the transformer area;
the ammeter self-checking module is used for acquiring parameter data of an ammeter in an abnormal electricity consumption platform area, wherein the parameter data comprises ammeter working end voltage and working end current;
the data analysis module is used for analyzing whether an ammeter with abnormal electricity consumption exists in the current area according to the data acquired by the data acquisition module;
and the ammeter precision analysis module is used for judging whether the ammeter measurement precision error occurs due to internal resistance aging or external factors according to the terminal voltage and the terminal current of the ammeter during operation, which are acquired by the ammeter self-checking module.
As a further description of the solution of the present invention, the working process of the data analysis module includes:
acquiring a time-dependent change curve l (t) of electricity consumption and a time-dependent change curve c (t) of electricity consumption in a current platform area within a period of time;
acquiring a time-dependent change curve s (t) of power supply quantity in a current station area within a period of time;
calculating a metering abnormality index K of the electric meter of the area through l (t), c (t) and s (t):
wherein t is 1 T is the initial time point in a period of time 2 For a period of time, F is an actual relation function curve between loss, electricity consumption and electricity supply 0 (t) is a preset standard curve between loss, electricity consumption and power supply, st is a reference coefficient, and t is E [ t ] 1 ,t 2 ]；
The abnormal measurement index K of the electric meter in the station area and a preset threshold K are compared 1 、K 2 Comparison is performed:
if K is E [ K 1 ,K 2 ]The current district ammeter measurement is normal;
otherwise, the current station area has abnormal ammeter measurement.
As a further description of the scheme of the invention, when the ammeter metering abnormality exists in the current area:
if K is less than K 1 The current station area has abnormal ammeter metering and the actual electricity consumption is larger than ammeter metering;
if K > K 2 And if the current station area has abnormal electricity meter metering, and the actual electricity consumption is smaller than the electricity meter metering.
As a further description of the solution of the present invention, the actual relation between the loss, the power consumption and the power supply is a function curve
Where ρt is a reference coefficient.
Through the technical scheme, the time-dependent change curve l (t) of the electricity consumption and the time-dependent change curve c (t) of the electricity consumption in the current area and the time-dependent change curve s (t) of the electricity consumption in the current area are obtained, and the formula is adoptedCalculating an abnormal ammeter measurement index K existing in the current station area, and enabling the abnormal ammeter measurement index K of the station area to be equal to a preset threshold K 1 、K 2 Comparison is performed: if K is E [ K 1 ,K 2 ]The current district ammeter measurement is normal; otherwise, the current station area has abnormal ammeter measurement.
As a further description of the scheme of the invention, when the metering abnormality of the ammeter exists in the current area, the daily electricity quantity Q of each ammeter in the current area within a period of time is obtained i Calculating the electricity consumption square difference of each ammeter in a period of time according to the daily electricity consumption:
wherein i is the number of the electric meters, i is smaller than the total number of the electric meters in the platform area,the daily average electricity consumption of the ith ammeter;
judging the fluctuation degree of the metering data of the ith ammeter according to the sigma, if the fluctuation degree is obviously abnormal, indicating that the metering precision of the ammeter is abnormal, and marking the ammeter label.
Through the technical scheme, the daily electricity Qi of each ammeter in the current area in a period of time is obtained, the electricity consumption square difference of each ammeter in a period of time is calculated according to the daily electricity, the fluctuation degree of the metering data of the ith ammeter is judged according to sigma, if the fluctuation degree is obviously abnormal, the metering precision of the ammeter is indicated to be abnormal, and the ammeter label is marked.
As a further description of the scheme of the invention, when the metering precision of the ammeter is abnormal:
acquiring working voltage and working current of the ammeter in a period of time according to the ammeter number, and fitting a working voltage change curve U (t) with time according to the working voltage and the working current in the period of time of the ammeter respectively, wherein the working current change curve I (t) with time is obtained;
respectively deriving a time-dependent curve U (t) of the working voltage and a time-dependent curve I (t) of the working current to obtain inverse functions of U (t) and I (t)And->
Respectively orderObtaining an extremum of the working voltage and the working current of the ammeter in one period of time;
obtaining the maximum value U of the working voltage of the ammeter in a period of time through the extreme value max And a minimum value U min ；
Obtaining the maximum value I of the working current of the ammeter in a period of time through the extreme value max And minimum value I min ；
According to the maximum value U of the working voltage of the ammeter in a period of time max And a minimum value U min Solving voltage abnormality parameters:
wherein A is U As a parameter of the voltage anomaly,average working voltage of ammeter in a period of time;
according to the maximum value I of the working current of the ammeter in a period of time max And minimum value I min Solving current anomaly parameters:
wherein A is I As a parameter of the abnormality of the current,average working current of the ammeter in a period of time;
according to A U And A I And (5) obtaining an ammeter abnormality index mu:
μ＝α*A U +βA I ；
wherein alpha and beta are weight coefficients;
the abnormality index mu is compared with a preset threshold mu 0 Comparing, if μ is greater than μ 0 The metering of the ammeter is abnormal caused by external factors, otherwise, the metering is further judged.
According to the technical scheme, the working voltage and the working current of the ammeter in a period of time are obtained, the working voltage and the working current in the period of time are respectively fitted with the time-dependent change curve U (t) of the working voltage and the time-dependent change curve I (t) of the working current, and inverse functions of U (t) and I (t) are obtainedAnd->Respectively let->Obtaining the extreme value of the working voltage and the working current of the ammeter in one period of time, and calculating a voltage abnormality parameter A according to the extreme value U And current anomaly parameter A I According to A U And A I Obtaining an abnormality index mu of the ammeter, and comparing the abnormality index mu with a preset threshold mu 0 Comparing, if μ is greater than μ 0 The meter measurement is abnormal due to external factors.
As a further description of the solution of the present invention, the further judging process includes:
acquiring the voltage U and the terminal current I of a working terminal of the ammeter in real time according to the ammeter number;
calculating the current resistance R in the ammeter through the real-time working terminal voltage U and the terminal current I, and setting the current resistance R in the ammeter and the design resistance R in the ammeter 0 Comparing, if R is greater than R 0 And the fact that the internal resistance value of the ammeter is increased due to aging is indicated, so that the metering accuracy of the ammeter is error.
Through the technical scheme, the working end voltage U and the end current I of the electric meter are obtained in real time according to the number of the electric meter, the current resistance R inside the electric meter is calculated through the working end voltage U and the end current I, and the current resistance R inside the electric meter and the design resistance R inside the electric meter are calculated 0 Comparing, if R is greater than R 0 And the fact that the internal resistance value of the ammeter is increased due to aging is indicated, so that the metering accuracy of the ammeter is error.
As a further description of the solution of the present invention, the working method of the system comprises the following steps:
step 1, calculating an abnormal ammeter measurement index K of a current station area, and judging whether the current station area has abnormal ammeter measurement according to the abnormal ammeter measurement index K;
step 2, taking the daily electricity quantity Q of each ammeter in the current area within a period of time i For electric meter with abnormal metering precisionMarking rows;
step 3, calculating an ammeter abnormality index mu of the ammeter with abnormal metering precision, and judging whether the reason for the occurrence of the ammeter metering abnormality is an external factor or not according to the ammeter abnormality index mu;
and 4, calculating the current resistance R in the electric meter, and judging whether the electric meter is large due to aging according to the current resistance R in the electric meter, so that the metering accuracy of the electric meter is error.
The invention has the beneficial effects that:
1. according to the method, firstly, an abnormal ammeter metering index K in a current area is calculated, whether the current area has ammeter metering abnormality is judged according to the abnormal ammeter metering index K, then, an ammeter abnormal index mu of an ammeter with abnormal metering precision is calculated, whether the reason for the occurrence of ammeter metering abnormality is an external factor is judged according to the ammeter abnormal index mu, finally, the current resistance R in the ammeter is calculated, and whether the internal resistance of the ammeter is increased due to aging is judged according to the current resistance R in the ammeter, so that the ammeter metering precision is error, and the problem-free ammeter is replaced due to judgment errors, so that property loss is avoided.
2. According to the invention, the data is automatically acquired through the data acquisition module and the ammeter self-checking module, the data analysis module and the ammeter precision analysis module automatically analyze the data, and the ammeter with the ammeter precision error in the area is automatically checked out, and whether the ammeter error is an external factor or an internal factor is judged, so that manual spot check is not needed, and the checking efficiency is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of an electric meter self-checking system based on the internet of things.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an automatic detection system for accuracy and reliability of an electric meter includes:
the data acquisition module is used for monitoring the electricity consumption parameters of the current station area;
the electricity consumption parameters comprise power consumption of the transformer area, power consumption of the transformer area and power supply of the transformer area;
the data analysis module is used for analyzing whether an ammeter with abnormal electricity consumption exists in the current area according to the data acquired by the data acquisition module;
the working process of the data analysis module comprises the following steps:
acquiring a time-dependent change curve l (t) of electricity consumption and a time-dependent change curve c (t) of electricity consumption in a current platform area within a period of time;
acquiring a time-dependent change curve s (t) of power supply quantity in a current station area within a period of time;
calculating a metering abnormality index K of the electric meter of the area through l (t), c (t) and s (t):
wherein t is 1 T is the initial time point in a period of time 2 For a period of time, F is an actual relation function curve between loss, electricity consumption and electricity supply 0 (t) is a preset standard curve between loss, electricity consumption and power supply, st is a reference coefficient, and t is E [ t ] 1 ,t 2 ]；
The abnormal measurement index K of the electric meter in the station area and a preset threshold K are compared 1 、K 2 Comparison is performed:
if K is E [ K 1 ,K 2 ]The current district ammeter measurement is normal;
otherwise, the current station area has abnormal ammeter measurement.
When the current station area has abnormal ammeter metering:
if K is less than K 1 The current station area has abnormal ammeter metering and the actual electricity consumption is larger than ammeter metering;
if K > K 2 And if the current station area has abnormal electricity meter metering, and the actual electricity consumption is smaller than the electricity meter metering.
The actual relation function curve among the loss, the electricity consumption and the electricity supply quantity
Where ρt is a reference coefficient.
Preset threshold K 1 、K 2 For empirical data, the invention is not described.
Through the technical scheme, the time-dependent change curve l (t) of the electricity consumption and the time-dependent change curve c (t) of the electricity consumption in the current area and the time-dependent change curve s (t) of the electricity consumption in the current area are obtained, and the formula is adoptedCalculating an abnormal ammeter measurement index K existing in the current station area, and enabling the abnormal ammeter measurement index K of the station area to be equal to a preset threshold K 1 、K 2 Comparison is performed: if K is E [ K 1 ,K 2 ]The current district ammeter measurement is normal; otherwise, the current station area has abnormal ammeter measurement.
When the metering of the ammeter in the current area is abnormal, acquiring the daily electricity quantity Q of each ammeter in the current area within a period of time i Calculating the electricity consumption square difference of each ammeter in a period of time according to the daily electricity consumption:
wherein i is the number of the electric meters, i is smaller than the total number of the electric meters in the platform area,the daily average electricity consumption of the ith ammeter;
judging the fluctuation degree of the metering data of the ith ammeter according to the sigma, if the fluctuation degree is obviously abnormal, indicating that the metering precision of the ammeter is abnormal, and marking the ammeter label.
Through the technical scheme, the daily electricity quantity Q of each ammeter in the current district within a period of time is obtained i And calculating the electricity consumption square difference of each ammeter in a period of time according to the daily electricity consumption, judging the fluctuation degree of the metering data of the ith ammeter according to sigma, if the fluctuation degree is obviously abnormal, indicating that the metering precision of the ammeter is abnormal, and marking the ammeter label.
The ammeter self-checking module is used for acquiring parameter data of an ammeter in an abnormal electricity consumption platform area, wherein the parameter data comprises ammeter working end voltage and working end current;
and the ammeter precision analysis module is used for calculating the internal resistance of the ammeter according to the port voltage and the port current of the ammeter metering chip obtained by the ammeter self-checking module and judging whether the internal resistance of the ammeter is aged or not.
When the metering precision of the ammeter is abnormal:
acquiring working voltage and working current of the ammeter in a period of time according to the ammeter number, and fitting a working voltage change curve U (t) with time according to the working voltage and the working current in the period of time of the ammeter respectively, wherein the working current change curve I (t) with time is obtained;
respectively deriving a time-dependent curve U (t) of the working voltage and a time-dependent curve I (t) of the working current to obtain inverse functions of U (t) and I (t)And->
Respectively orderWorking voltage sum of ammeter in one period of timeExtremum of the operating current;
obtaining the maximum value U of the working voltage of the ammeter in a period of time through the extreme value max And a minimum value U min ；
Obtaining the maximum value I of the working current of the ammeter in a period of time through the extreme value max And minimum value I min ；
According to the maximum value U of the working voltage of the ammeter in a period of time max And a minimum value U min Solving voltage abnormality parameters:
wherein A is U As a parameter of the voltage anomaly,average working voltage of ammeter in a period of time;
according to the maximum value I of the working current of the ammeter in a period of time max And minimum value I min Solving current anomaly parameters:
wherein A is I As a parameter of the abnormality of the current,average working current of the ammeter in a period of time;
according to A U And A I And (5) obtaining an ammeter abnormality index mu:
μ＝α*A U +βA I ；
wherein alpha and beta are weight coefficients;
the abnormality index mu is compared with a preset threshold mu 0 Comparing, if μ is greater than μ 0 The metering of the ammeter is abnormal caused by external factors, otherwise, the metering is further judged.
Preset threshold mu 0 For empirical data, the invention is not described。
According to the technical scheme, the working voltage and the working current of the ammeter in a period of time are obtained, the working voltage and the working current in the period of time are respectively fitted with the time-dependent change curve U (t) of the working voltage and the time-dependent change curve I (t) of the working current, and inverse functions of U (t) and I (t) are obtainedAnd->Respectively let->Obtaining the extreme value of the working voltage and the working current of the ammeter in one period of time, and calculating a voltage abnormality parameter A according to the extreme value U And current anomaly parameter A I According to A U And A I Obtaining an abnormality index mu of the ammeter, and comparing the abnormality index mu with a preset threshold mu 0 Comparing, if μ is greater than μ 0 The meter measurement is abnormal due to external factors.
The further judging process comprises the following steps:
acquiring the voltage U and the terminal current I of a working terminal of the ammeter in real time according to the ammeter number;
calculating the current resistance R in the ammeter through the real-time working terminal voltage U and the terminal current I, and setting the current resistance R in the ammeter and the design resistance R in the ammeter 0 Comparing, if R is greater than R 0 And the fact that the internal resistance value of the ammeter is increased due to aging is indicated, so that the metering accuracy of the ammeter is error.
Through the technical scheme, the working end voltage U and the end current I of the electric meter are obtained in real time according to the number of the electric meter, the current resistance R inside the electric meter is calculated through the working end voltage U and the end current I, and the current resistance R inside the electric meter and the design resistance R inside the electric meter are calculated 0 Comparing, if R is greater than R 0 And the fact that the internal resistance value of the ammeter is increased due to aging is indicated, so that the metering accuracy of the ammeter is error.
The working method of the system comprises the following steps:
step 1, calculating an abnormal ammeter measurement index K of a current station area, and judging whether the current station area has abnormal ammeter measurement according to the abnormal ammeter measurement index K;
step 2, taking the daily electricity quantity Q of each ammeter in the current area within a period of time i Marking the ammeter with abnormal metering precision;
step 3, calculating an ammeter abnormality index mu of the ammeter with abnormal metering precision, and judging whether the reason for the occurrence of the ammeter metering abnormality is an external factor or not according to the ammeter abnormality index mu;
and 4, calculating the current resistance R in the electric meter, and judging whether the electric meter is large due to aging according to the current resistance R in the electric meter, so that the metering accuracy of the electric meter is error.
An embodiment of the present invention has been described in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (4)
1. An automatic detection system for accuracy and reliability of an electric meter, comprising:
the data acquisition module is used for monitoring the electricity consumption parameters of the current station area;
the electricity consumption parameters comprise power consumption of the transformer area, power consumption of the transformer area and power supply of the transformer area;
the ammeter self-checking module is used for acquiring parameter data of an ammeter in an abnormal electricity consumption platform area, wherein the parameter data comprises ammeter working end voltage and working end current;
the data analysis module is used for analyzing whether an ammeter with abnormal electricity consumption exists in the current area according to the data acquired by the data acquisition module;
the ammeter precision analysis module is used for judging whether the ammeter measurement precision error occurs due to internal resistance aging or external factors according to the terminal voltage and the terminal current of the ammeter during operation, which are obtained by the ammeter self-checking module;
the working process of the data analysis module comprises the following steps:
acquiring a time-dependent change curve l (t) of electricity consumption and a time-dependent change curve c (t) of electricity consumption in a current platform area within a period of time;
acquiring a time-dependent change curve s (t) of power supply quantity in a current station area within a period of time;
calculating a metering abnormality index K of the electric meter of the area through l (t), c (t) and s (t):
wherein t is 1 T is the initial time point in a period of time 2 For a period of time, F is an actual relation function curve between loss, electricity consumption and electricity supply 0 (t) is a preset standard curve between loss, electricity consumption and power supply, st is a reference coefficient, and t is E [ t ] 1 ,t 2 ]；
The abnormal measurement index K of the electric meter in the station area and a preset threshold K are compared 1 、K 2 Comparison is performed:
if K is E [ K 1 ,K 2 ]The current district ammeter measurement is normal;
otherwise, the current station area has abnormal ammeter measurement;
when the current station area has abnormal ammeter metering:
if K is less than K 1 The current station area has abnormal ammeter metering and the actual electricity consumption is larger than ammeter metering;
if K > K 2 The current station area has abnormal ammeter metering and the actual electricity consumption is smaller than ammeter metering;
when the metering of the ammeter in the current area is abnormal, acquiring the daily electricity quantity Q of each ammeter in the current area within a period of time i Calculating the electricity consumption square difference of each ammeter in a period of time according to the daily electricity consumption:
wherein i is the number of the electric meters, i is smaller than the total number of the electric meters in the platform area,the daily average electricity consumption of the ith ammeter;
judging the fluctuation degree of the metering data of the ith ammeter according to sigma, if the fluctuation degree is obviously abnormal, indicating that the metering precision of the ammeter is abnormal, and marking the ammeter mark;
when the metering precision of the ammeter is abnormal:
acquiring working voltage and working current of the ammeter in a period of time according to the ammeter number, and fitting a working voltage change curve U (t) with time according to the working voltage and the working current in the period of time of the ammeter respectively, wherein the working current change curve I (t) with time is obtained;
respectively deriving a time-dependent curve U (t) of the working voltage and a time-dependent curve I (t) of the working current to obtain inverse functions of U (t) and I (t)And->
Respectively orderObtaining an extremum of the working voltage and the working current of the ammeter in one period of time;
obtaining the maximum value U of the working voltage of the ammeter in a period of time through the extreme value max And a minimum value U min ；
Obtaining the maximum value I of the working current of the ammeter in a period of time through the extreme value max And minimum value I min ；
According to the maximum value U of the working voltage of the ammeter in a period of time max And a minimum value U min Solving voltage abnormality parameters:
wherein A is U As a parameter of the voltage anomaly,average working voltage of ammeter in a period of time;
according to the maximum value I of the working current of the ammeter in a period of time max And minimum value I min Solving current anomaly parameters:
wherein A is I As a parameter of the abnormality of the current,average working current of the ammeter in a period of time;
according to A U And A I And (5) obtaining an ammeter abnormality index mu:
μ＝α*A U +βA I ；
wherein alpha and beta are weight coefficients;
the abnormality index mu is compared with a preset threshold mu 0 Comparing, if μ is greater than μ 0 The metering of the ammeter is abnormal caused by external factors, otherwise, the metering is further judged.
2. The automatic meter accuracy and reliability detection system according to claim 1, wherein the actual relationship function curve among the loss, the power consumption and the power supply
Where ρt is a reference coefficient.
3. The automatic meter accuracy and reliability detection system according to claim 1, wherein the further judging process comprises:
acquiring the voltage U and the terminal current I of a working terminal of the ammeter in real time according to the ammeter number;
calculating the current resistance R in the ammeter through the real-time working terminal voltage U and the terminal current I, and setting the current resistance R in the ammeter and the design resistance R in the ammeter 0 Comparing, if R is greater than R 0 And the fact that the internal resistance value of the ammeter is increased due to aging is indicated, so that the metering accuracy of the ammeter is error.
4. An automatic detection system for precision and reliability of electric meters according to claim 1, characterized in that the working method of said system comprises the following steps:
step 1, calculating an abnormal ammeter measurement index K of a current station area, and judging whether the current station area has abnormal ammeter measurement according to the abnormal ammeter measurement index K;
step 2, taking the daily electricity quantity Q of each ammeter in the current area within a period of time i Marking the ammeter with abnormal metering precision;
step 3, calculating an ammeter abnormality index mu of the ammeter with abnormal metering precision, and judging whether the reason for the occurrence of the ammeter metering abnormality is an external factor or not according to the ammeter abnormality index mu;
and 4, calculating the current resistance R in the electric meter, and judging whether the electric meter is large due to aging according to the current resistance R in the electric meter, so that the metering accuracy of the electric meter is error.
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