CN109142960B - Three-phase three-wire metering device wrong wiring online discrimination method and system - Google Patents

Three-phase three-wire metering device wrong wiring online discrimination method and system Download PDF

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CN109142960B
CN109142960B CN201810897085.6A CN201810897085A CN109142960B CN 109142960 B CN109142960 B CN 109142960B CN 201810897085 A CN201810897085 A CN 201810897085A CN 109142960 B CN109142960 B CN 109142960B
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phase
metering device
judging
wiring
voltage
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CN109142960A (en
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陈文礼
杨芾藜
常仕亮
周全
何珉
邹波
何蓓
吴彬
侯兴哲
郑可
籍勇亮
叶君
刘型志
王蕊
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Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Chongqing Electric Power Co Ltd
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Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Chongqing Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits

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  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a method and a system for discriminating wrong wiring of a three-phase three-wire metering device on line, which comprises the following steps: according to the method, a line voltage effective value, a line voltage phase sequence, a phase current effective value, a phase current phase sequence, reactive power and a power factor of a first element and a second element in a three-phase three-wire metering device are called and measured by a power utilization acquisition system; and judging the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifying wrong wiring in the metering device. The beneficial effects obtained by the invention are as follows: the device realizes online screening of wrong wiring of the three-phase three-wire metering device based on the conventional power utilization information acquisition system so as to realize intelligent screening of the wrong wiring and reduce the workload and safety risk of field verification.

Description

Three-phase three-wire metering device wrong wiring online discrimination method and system
Technical Field
The invention relates to the technical field of electric energy metering, in particular to a method and a system for discriminating wrong wiring of a three-phase three-wire metering device on line.
Background
At present, a three-phase three-wire metering wiring mode is mainly used for a neutral point ungrounded system (including voltage levels of 10kV, 35kV and the like), mainly relates to a power distribution network, and is used for transmitting electric energy to power users, and the energy flow direction is in one-way flow. The three-phase three-wire metering device comprises a three-phase three-wire electric energy meter, a voltage transformer, a current transformer and a secondary circuit, and the accuracy of electric energy metering can be caused by the occurrence of wiring errors in any link. In the three-phase three-wire metering device, a voltage transformer mostly adopts a V-V wiring mode, and a primary side and a secondary side of the voltage transformer are both line voltages, and when the polarity of the primary side or the secondary side of the voltage transformer is connected in a reverse mode or the voltage phase sequence is wrong, the wrong wiring of the voltage transformer is more complicated than that of the three-phase three-wire metering device.
Because of the responsibility, the service level and the proficiency of the meter-installing and wiring personnel, the power laws and regulations of power consumers are thin, and electricity is intentionally stolen. At present, the judgment of wrong wiring is usually carried out on site through a site calibrator for manual verification and inspection, the verification periods of different types of loads are different, the site verification consumes time and labor, and the site wiring has safety risks.
Disclosure of Invention
In view of the above defects in the prior art, the present invention aims to provide an online screening method and an online screening system for wrong wiring of a three-phase three-wire metering device, which realize online screening for the wrong wiring of the three-phase three-wire metering device based on the existing power consumption information acquisition system, so as to realize intelligent screening for the wrong wiring and reduce the workload and safety risk of field verification.
One of the purposes of the invention is realized by the technical scheme, the on-line screening method for the wrong wiring of the three-phase three-wire metering device comprises the following steps:
s1: according to the data to be judged of a first element and a second element in the three-phase three-wire metering device called for and measured by the power utilization acquisition system;
s2: judging the wiring of the metering device according to the data to be judged of the first element and the second element, and identifying the wrong wiring in the metering device;
the first element and the second element are located in a metrology device and are capable of measuring data to be determined.
Further, the data to be determined in step S1 includes: a line voltage effective value;
the step S2 includes the following steps of determining the connection of the metering device according to the effective values of the line voltages of the first element and the second element:
s201: obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
S202: if (U)12，U32) Is (0, 0), (0, U)L±5％UL)、(UL±5％UL，0)、
Figure GDA0002932212210000021
Figure GDA0002932212210000022
Or
Figure GDA0002932212210000023
If any, the connection is judged to be broken;
s203: if (U)12，U32) Is composed of
Figure GDA0002932212210000024
Or
Figure GDA0002932212210000025
Judging that the wiring is broken or has opposite polarity;
s204: if (U)12，U32) Is (U)L±5％UL，UL±5％UL) If so, judging the wiring to be normal;
s205: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000026
And
Figure GDA0002932212210000027
judging that the wiring voltage is low by the two special values;
s206: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000028
The special value judges that the wiring voltage is higher.
Further, the data to be determined in step S1 further includes: line voltage phase sequence;
the step S2 includes the following steps of determining according to the line voltage phase sequence of the first element and the second element:
s212: if the angle is less than or equal to minus 65 degrees delta thetaU12Judging the positive phase sequence when the temperature is less than or equal to-55 degrees;
s213: if the angle is less than or equal to 55 degrees delta thetaU12Judging the phase sequence to be the reverse phase sequence if the phase sequence is less than or equal to 65 degrees;
s214: if the angle is less than or equal to minus 130 degrees delta thetaU12Delta theta is less than or equal to-110 degrees or less than or equal to 110 degreesU12No phase sequence is judged to be in the angle of 130 degrees or less, namely the connection is in the opposite polarity。
Further, the data to be determined in step S1 further includes: the effective value of the phase current;
the specific steps of determining according to the phase current effective values of the first element and the second element in step S2 are as follows:
s221: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
S222: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s223: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s224: if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
Further, the data to be determined in step S1 further includes: phase current phase sequence;
the specific steps of determining according to the phase-to-phase current sequences of the first element and the second element in step S2 are as follows:
s231: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S232: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s233: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
Further, the data to be determined in step S1 further includes: reactive power and power factor;
the specific steps of calculating the power factor angle of each element according to the reactive power and the power factor of the first element and the second element in step S2 are as follows:
s241: determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s242: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s243: and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
Further, the step of calculating the power factor angle in step S242 is as follows:
s2421: power factor through the first element
Figure GDA0002932212210000031
And power factor of the second element
Figure GDA0002932212210000032
Respectively calculating the absolute values of the power factor angles of the first elements
Figure GDA0002932212210000033
Absolute value of power factor angle of second element
Figure GDA0002932212210000034
S2422: using formulas
Figure GDA0002932212210000035
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure GDA0002932212210000036
Power factor angle of the second element
Figure GDA0002932212210000037
The other purpose of the invention is realized by the technical scheme that the on-line screening system for the wrong wiring of the three-phase three-wire metering device comprises the following components: the system comprises a data acquisition unit and a data identification unit;
the data acquisition unit is used for calling and measuring line voltage effective values, line voltage phase sequences, phase current effective values, phase current phase sequences, reactive power and power factors of a first element and a second element in the three-phase three-wire metering device according to the power utilization acquisition system;
the data identification unit judges the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifies the wrong wiring in the metering device.
Further, the specific identification process of the data identification unit includes: judging the wiring of the metering device according to the effective values of the line voltages of the first element and the second element, wherein the judging steps are as follows:
s801: obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
S802: if (U)12，U32) Is (0, 0), (0, U)L±5％UL)、(UL±5％UL，0)、
Figure GDA0002932212210000041
Figure GDA0002932212210000042
Or
Figure GDA0002932212210000043
If any, the connection is judged to be broken;
s803: if (U)12，U32) Is composed of
Figure GDA0002932212210000044
Or
Figure GDA0002932212210000045
Judging that the wiring is broken or has opposite polarity;
s804: if (U)12，U32) Is (U)L±5％UL，UL±5％UL) If so, judging the wiring to be normal;
s805: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000046
And
Figure GDA0002932212210000047
judging that the wiring voltage is low by the two special values;
s806: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000048
The special value judges that the wiring voltage is higher.
Further, the specific identification process of the data identification unit includes: the wiring of the metering device is judged according to the line voltage phase sequence of the first element and the second element, and the judgment comprises the following specific steps:
s901: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S902: if the angle is less than or equal to minus 65 degrees delta thetaU12Judging the positive phase sequence when the temperature is less than or equal to-55 degrees;
s903: if the angle is less than or equal to 55 degrees delta thetaU12Judging the phase sequence to be the reverse phase sequence if the phase sequence is less than or equal to 65 degrees;
s904: if the angle is less than or equal to minus 130 degrees delta thetaU12Delta theta is less than or equal to-110 degrees or less than or equal to 110 degreesU12And if the angle is less than or equal to 130 degrees, judging that no phase sequence exists, namely the connection is opposite in polarity.
Further, the specific identification process of the data identification unit includes: judging the wiring of the metering device according to the effective values of the phase currents of the first element and the second element, wherein the judging steps are as follows:
s1001: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
S1002: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s1003: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s1004: if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
Further, the specific identification process of the data identification unit includes: judging the wiring of the metering device according to the phase current sequence of the first element and the second element, wherein the judging specific steps are as follows:
s1101: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S1102: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s1103: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
Further, the specific identification process of the data identification unit includes: the wiring of the metering device is judged according to the reactive power and the power factor of the first element and the second element, and the judgment comprises the following specific steps:
s1201: determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s1202: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s1203: carrying out in-phase matching on the voltage and the current by utilizing the load condition or the data of adjacent metering points, and identifying wrong wiring;
the power factor angle calculation step in step S1202 is as follows:
s1211: power factor through the first element
Figure GDA0002932212210000051
And power factor of the second element
Figure GDA0002932212210000052
Respectively calculating the absolute values of the power factor angles of the first elements
Figure GDA0002932212210000053
Absolute value of power factor angle of second element
Figure GDA0002932212210000054
S1212: using formulas
Figure GDA0002932212210000055
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure GDA0002932212210000056
Power factor angle of the second element
Figure GDA0002932212210000057
Further, the metering device comprises one of the following:
the three-phase three-wire electric energy meter comprises a three-phase three-wire electric energy meter, a voltage transformer, a current transformer and a secondary circuit.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the present invention can be realized in hardware, software, or a combination of hardware and software;
(2) according to the invention, the data for identifying wrong wiring is acquired online by the electricity utilization information acquisition system, and the metering device for identifying the wrong wiring is directly identified by the system, so that manual detection on site is avoided, the wrong wiring identification efficiency is improved, and the timeliness for finding the wrong wiring is improved;
(3) book (I)The invention utilizes the effective value U of the line voltage of the first element and the second element12、U32And a phase difference Δ θU12And judging the positive phase sequence, the negative phase sequence and the phase sequence absence of the voltage phase sequence, thereby identifying the wrong wiring with the reverse polarity.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
fig. 1 is a schematic flow chart of an online screening method for wrong wiring of a three-phase three-wire metering device according to an embodiment.
Fig. 2 is a schematic flow chart of a method for screening false wiring of a three-phase three-wire metering device in an online manner according to another embodiment.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1: as shown in fig. 1; an online discrimination method for wrong wiring of a three-phase three-wire metering device comprises the following steps:
s1: according to the method, a line voltage effective value, a line voltage phase sequence, a phase current effective value, a phase current phase sequence, reactive power and a power factor of a first element and a second element in a three-phase three-wire metering device are called and measured by a power utilization acquisition system;
s2: judging the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifying wrong wiring in the metering device;
the first element and the second element are located in a metering device and are capable of measuring line voltage and phase current.
In step S2, the specific steps of determining the connection of the metering device according to the effective values of the line voltages of the first element and the second element are as follows:
s201: obtainTaking the effective value U of the line voltage of the first element and the second element12、U32And the rated line voltage U of the metering deviceL；
S202: if (U)12，U32) Is (0, 0), (0, U)L±5％UL)、(UL±5％UL，0)、
Figure GDA0002932212210000071
Figure GDA0002932212210000072
Or
Figure GDA0002932212210000073
And if any, judging the connection line to be broken.
S203: if (U)12，U32) Is composed of
Figure GDA0002932212210000074
Or
Figure GDA0002932212210000075
The connection is judged to be broken or the polarity is opposite.
S204: if (U)12，U32) Is (U)L±5％UL，UL±5％UL) And judging the wiring to be normal.
S205: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000076
And
Figure GDA0002932212210000077
judging that the wiring voltage is low by the two special values;
s206: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000078
The special value judges that the wiring voltage is higher.
The specific steps of the step S2 for determining according to the line voltage phase sequence of the first element and the second element are as follows:
s211: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S212: if the angle is less than or equal to minus 65 degrees delta thetaU12Judging the positive phase sequence when the temperature is less than or equal to-55 degrees;
s213: if the angle is less than or equal to 55 degrees delta thetaU12Judging the phase sequence to be the reverse phase sequence if the phase sequence is less than or equal to 65 degrees;
s214: if the angle is less than or equal to minus 130 degrees delta thetaU12Delta theta is less than or equal to-110 degrees or less than or equal to 110 degreesU12And if the angle is less than or equal to 130 degrees, judging that no phase sequence exists, namely the connection is opposite in polarity.
The specific steps of determining from the effective values of the phase currents of the first element and the second element in step S2 are as follows:
s221: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
S222: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s223: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s224: if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
The specific steps of determining according to the phase current phase sequence of the first element and the second element in step S2 are as follows:
s231: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S232: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s233: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
The specific steps of calculating the power factor angle of each element according to the reactive power and the power factor of the first element and the second element in step S2 are as follows:
s241: determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s242: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s243: and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
The power factor angle in step S242 is calculated as follows:
s2421: power factor through the first element
Figure GDA0002932212210000081
And power factor of the second element
Figure GDA0002932212210000082
Respectively calculating the absolute values of the power factor angles of the first elements
Figure GDA0002932212210000083
Absolute value of power factor angle of second element
Figure GDA0002932212210000084
S2422: using formulas
Figure GDA0002932212210000085
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure GDA0002932212210000086
Power factor of the second elementCorner
Figure GDA0002932212210000087
An on-line screening system for the wrong wiring of a three-phase three-wire metering device comprises: the data acquisition unit and the data identification unit;
the data acquisition unit calls and measures line voltage effective values, line voltage phase sequences, phase current effective values, phase current phase sequences, reactive power and power factors of a first element and a second element in the three-phase three-wire metering device according to the power utilization acquisition system;
the data identification unit judges the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifies the wrong wiring in the metering device.
The metering device comprises a three-phase three-wire electric energy meter, a voltage transformer, a current transformer and a secondary circuit.
The data identification unit is capable of:
(1) and judging the wiring of the metering device according to the effective values of the line voltages of the first element and the second element:
obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
If (U)12，U32) Is (0, 0), (0, U)L±5％UL)、(UL±5％UL，0)、
Figure GDA0002932212210000091
Or
Figure GDA0002932212210000092
And if any, judging the connection line to be broken.
If (U)12，U32) Is composed of
Figure GDA0002932212210000093
Or
Figure GDA0002932212210000094
Figure GDA0002932212210000095
The connection is judged to be broken or the polarity is opposite.
If (U)12，U32) Is (U)L±5％UL，UL±5％UL) And judging the wiring to be normal.
If U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000096
And
Figure GDA0002932212210000097
judging that the wiring voltage is low by the two special values;
if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000098
The special value judges that the wiring voltage is higher.
(2) And judging according to the line voltage phase sequence of the first element and the second element:
obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
If the angle is less than or equal to minus 65 degrees delta thetaU12Judging the positive phase sequence when the temperature is less than or equal to-55 degrees;
if the angle is less than or equal to 55 degrees delta thetaU12Judging the phase sequence to be the reverse phase sequence if the phase sequence is less than or equal to 65 degrees;
if the angle is less than or equal to minus 130 degrees delta thetaU12Delta theta is less than or equal to-110 degrees or less than or equal to 110 degreesU12And if the angle is less than or equal to 130 degrees, judging that no phase sequence exists, namely the connection is opposite in polarity.
(3) Judging according to the effective values of the phase currents of the first element and the second element:
obtaining a first element and a second elementEffective value of phase current I1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
If I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
(4) The specific steps of judging according to the phase current phase sequences of the first element and the second element are as follows:
obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
If Δ θI12If the value is more than 0, judging the positive phase sequence;
if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
(5) And calculating the power factor angle of each element according to the reactive power and the power factor of the first element and the second element:
determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
(6) Calculation of power factor angle:
power factor through the first element
Figure GDA0002932212210000106
And power factor of the second element
Figure GDA0002932212210000107
Respectively calculating the power factor angle of the first element
Figure GDA0002932212210000101
Power factor angle of the second element
Figure GDA0002932212210000102
Using formulas
Figure GDA0002932212210000103
Reactive power Q combined with first element1Reactive power Q of the second element2And calculating the power factor angle of the first element as a result of the previous step
Figure GDA0002932212210000104
Power factor angle of the second element
Figure GDA0002932212210000105
The present invention can be realized in hardware, software, or a combination of hardware and software; according to the invention, the data for identifying wrong wiring is acquired online by the electricity utilization information acquisition system, and the metering device for identifying the wrong wiring is directly identified by the system, so that manual detection on site is avoided, the wrong wiring identification efficiency is improved, and the timeliness for finding the wrong wiring is improved; the invention utilizes the effective value U of the line voltage of the first element and the second element12、U32And a phase difference Δ θU12And judging the positive phase sequence, the negative phase sequence and the phase sequence absence of the voltage phase sequence, thereby identifying the wrong wiring with the reverse polarity.
Example 2: as shown in fig. 1; an online discrimination method for wrong wiring of a three-phase three-wire metering device comprises the following steps:
s1: according to the method, a line voltage effective value, a line voltage phase sequence, a phase current effective value, a phase current phase sequence, reactive power and a power factor of a first element and a second element in a three-phase three-wire metering device are called and measured by a power utilization acquisition system;
s2: judging the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifying wrong wiring in the metering device;
the first element and the second element are located in a metering device and are capable of measuring line voltage and phase current.
In step S2, the specific steps of determining the connection of the metering device according to the effective values of the line voltages of the first element and the second element are as follows:
s201: obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
S202: if (U)12，U32) Is (0, 0), (0, U)L)、(UL，0)、
Figure GDA0002932212210000111
Figure GDA0002932212210000112
Or
Figure GDA0002932212210000113
And if any, judging the connection line to be broken.
S203: if (U)12，U32) Is composed of
Figure GDA0002932212210000114
Or
Figure GDA0002932212210000115
The connection is judged to be broken or the polarity is opposite.
S204: if (U)12，U32) Is (U)L，UL) And judging the wiring to be normal.
S205: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000116
And
Figure GDA0002932212210000117
judging that the wiring voltage is low by the two special values;
s206: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000118
The special value judges that the wiring voltage is higher.
The specific steps of the step S2 for determining according to the line voltage phase sequence of the first element and the second element are as follows:
s211: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S212: if Δ θU12If the value is minus 65 degrees, the positive phase sequence is judged;
s213: if Δ θU12Judging the reverse phase sequence when the angle is 55 degrees;
s214: if Δ θI12-130 ° or Δ θI12If it is 110 °, the phase sequence is determined to be out, i.e. the connection is of opposite polarity.
The specific steps of determining from the effective values of the phase currents of the first element and the second element in step S2 are as follows:
s221: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
S222: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s223: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s224: if I1And/or I2Greater than 0.05% InAnd is less than ImaxIf it is, then it is determined asThe first element and/or the second element are/is galvanically normal.
The specific steps of determining according to the phase current phase sequence of the first element and the second element in step S2 are as follows:
s231: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S232: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s233: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
The specific steps of calculating the power factor angle of each element according to the reactive power and the power factor of the first element and the second element in step S2 are as follows:
s241: determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s242: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s243: and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
The power factor angle in step S242 is calculated as follows:
s2421: power factor through the first element
Figure GDA0002932212210000126
And power factor of the second element
Figure GDA0002932212210000127
Respectively calculating the power factor angle of the first element
Figure GDA0002932212210000121
Power factor angle of the second element
Figure GDA0002932212210000122
S2422: using formulas
Figure GDA0002932212210000123
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure GDA0002932212210000124
Power factor angle of the second element
Figure GDA0002932212210000125
The present invention can be realized in hardware, software, or a combination of hardware and software; according to the invention, the data for identifying wrong wiring is acquired online by the electricity utilization information acquisition system, and the metering device for identifying the wrong wiring is directly identified by the system, so that manual detection on site is avoided, the wrong wiring identification efficiency is improved, and the timeliness for finding the wrong wiring is improved; the invention utilizes the effective value U of the line voltage of the first element and the second element12、U32And a phase difference Δ θU12And judging the positive phase sequence, the negative phase sequence and the phase sequence absence of the voltage phase sequence, thereby identifying the wrong wiring with the reverse polarity.
Example 3: as shown in fig. 1; an online discrimination method for wrong wiring of a three-phase three-wire metering device comprises the following steps:
s1: according to the method, a line voltage effective value, a line voltage phase sequence, a phase current effective value, a phase current phase sequence, reactive power and a power factor of a first element and a second element in a three-phase three-wire metering device are called and measured by a power utilization acquisition system;
s2: judging the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifying wrong wiring in the metering device;
the first element and the second element are located in a metering device and are capable of measuring line voltage and phase current.
In step S2, the specific steps of determining the connection of the metering device according to the effective values of the line voltages of the first element and the second element are as follows:
s201: obtaining effective values of line voltages U12 and U32 of the first element and the second element and rated line voltage U of the metering deviceL；
S202: if (U)12，U32) Is (0, 0), (0, U)L+5％UL)、(UL+5％UL，0)、
Figure GDA0002932212210000131
Figure GDA0002932212210000132
Or
Figure GDA0002932212210000133
And if any, judging the connection line to be broken.
S203: if (U)12，U32) Is composed of
Figure GDA0002932212210000134
Or
Figure GDA0002932212210000135
The connection is judged to be broken or the polarity is opposite.
S204: if (U)12，U32) Is (U)L+5％UL，UL+5％UL) And judging the wiring to be normal.
S205: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000136
And
Figure GDA0002932212210000137
judging that the wiring voltage is low by the two special values;
s206: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000138
The special value judges that the wiring voltage is higher.
The specific steps of the step S2 for determining according to the line voltage phase sequence of the first element and the second element are as follows:
s211: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S212: if Δ θU12If the value is minus 60 degrees, the positive phase sequence is judged;
s213: if Δ θU12Judging the phase sequence to be the reverse phase sequence if the angle is 60 degrees;
s214: if Δ θI12-120 ° or Δ θI12If 120 °, it is determined that there is no phase sequence, i.e., the connection lines are of opposite polarity.
The specific steps of determining from the effective values of the phase currents of the first element and the second element in step S2 are as follows:
s221: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
S222: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s223: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s224: if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
The specific steps of determining according to the phase current phase sequence of the first element and the second element in step S2 are as follows:
s231: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S232: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s233: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
The specific steps of calculating the power factor angle of each element according to the reactive power and the power factor of the first element and the second element in step S2 are as follows:
s241: determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s242: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s243: and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
The power factor angle in step S242 is calculated as follows:
s2421: power factor through the first element
Figure GDA0002932212210000146
And power factor of the second element
Figure GDA0002932212210000147
Respectively calculating the power factor angle of the first element
Figure GDA0002932212210000141
Power factor angle of the second element
Figure GDA0002932212210000142
S2422: using formulas
Figure GDA0002932212210000143
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure GDA0002932212210000144
Of a second elementAngle of power factor
Figure GDA0002932212210000145
The present invention can be realized in hardware, software, or a combination of hardware and software; according to the invention, the data for identifying wrong wiring is acquired online by the electricity utilization information acquisition system, and the metering device for identifying the wrong wiring is directly identified by the system, so that manual detection on site is avoided, the wrong wiring identification efficiency is improved, and the timeliness for finding the wrong wiring is improved; the invention utilizes the effective value U of the line voltage of the first element and the second element12、U32And a phase difference Δ θU12And judging the positive phase sequence, the negative phase sequence and the phase sequence absence of the voltage phase sequence, thereby identifying the wrong wiring with the reverse polarity.
Example 4: as shown in fig. 2; an online discrimination method for wrong wiring of a three-phase three-wire metering device comprises the following steps:
s11, calling and measuring the reactive power, the power factor, the line voltage effective value, the phase current effective value, the line voltage phase sequence and the phase current phase sequence of the three-phase three-wire electric energy meter by the electric information acquisition system;
s12, using the effective values of the line voltages of the first element and the second element to judge whether the line is broken (or the polarity is connected), whether the line is overvoltage, low voltage or normal voltage;
s13, judging polarity reversal, phase sequence error and normal phase sequence by using the voltage phase sequence of the line voltage;
s14, judging line break (no load), overload and normal current by using the effective values of the phase currents of the first element and the second element;
s15, judging whether the phase sequence is wrong or normal by using the current phase sequence of the phase current;
s16, calculating the power factor angle of each element by using the reactive power and the power factor of the first element and the second element;
s17, using a certain line voltage as a reference, determining the phase difference between the phase voltage and the reference voltage by using the voltage phase sequence;
s18, obtaining the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
and S19, matching the voltage and the current in phase by using the load condition or the data of the adjacent measuring points, and identifying wrong wiring.
The judgment of line break, overvoltage, low voltage and normal voltage in the step S12 comprises the following steps:
s121: obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
S122: if (U)12，U32) Is (0, 0), (0, U)L-5％UL)、(UL-5％UL，0)、
Figure GDA0002932212210000151
Figure GDA0002932212210000152
Or
Figure GDA0002932212210000153
And if any, judging the connection line to be broken.
S123: if (U)12，U32) Is composed of
Figure GDA0002932212210000154
Or
Figure GDA0002932212210000155
The connection is judged to be broken or the polarity is opposite.
S124: if (U)12，U32) Is (U)L-5％UL，UL-5％UL) And judging the wiring to be normal.
S125: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000156
And
Figure GDA0002932212210000157
judging that the wiring voltage is low by the two special values;
s126: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure GDA0002932212210000158
The special value judges that the wiring voltage is higher.
The voltage phase sequence determination in step S13 includes the following steps:
s131: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S132: if Δ θU12If the value is minus 55 degrees, judging the value as positive phase sequence;
s133: if Δ θU12If the angle is 65 degrees, judging the phase sequence to be the reverse phase sequence;
s134: if Δ θI12-110 ° or Δ θI12If 130 °, it is determined that there is no phase sequence, i.e., the connection lines are of opposite polarity.
The judgment of line break (no load), overload and normal current in step S14 includes the following steps:
s141: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of electric energy meternMaximum current I of electric energy metermax；
S142: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s143: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s144: if I1And/or I2Greater than 0.05% InAnd is greater than ImaxAnd judging that the current of the first element and/or the second element is normal.
The current phase sequence determination in step S15 includes the steps of:
s151: obtainTaking the phase difference Delta theta of the phase current of the first element and the second elementI12；
S152: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s153: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
The calculation of the power factor angle in step S16 includes the steps of:
s161: determining the phase difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s162: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s163: and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
The calculation of the power factor angle in step S162 is as follows:
s1621: power factor through the first element
Figure GDA0002932212210000166
And power factor of the second element
Figure GDA0002932212210000167
Respectively calculating the power factor angle of the first element
Figure GDA0002932212210000161
Power factor angle of the second element
Figure GDA0002932212210000162
S1622: using formulas
Figure GDA0002932212210000163
Reactive power Q combined with first element1Reactive power Q of the second element2And calculating the power factor angle of the first element as a result of the step S1621
Figure GDA0002932212210000164
Power factor angle of the second element
Figure GDA0002932212210000165
The present invention can be realized in hardware, software, or a combination of hardware and software; according to the invention, the data for identifying wrong wiring is acquired online by the electricity utilization information acquisition system, and the metering device for identifying the wrong wiring is directly identified by the system, so that manual detection on site is avoided, the wrong wiring identification efficiency is improved, and the timeliness for finding the wrong wiring is improved; the invention utilizes the effective value U of the line voltage of the first element and the second element12、U32And a phase difference Δ θU12And judging the positive phase sequence, the negative phase sequence and the phase sequence absence of the voltage phase sequence, thereby identifying the wrong wiring with the reverse polarity.
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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand 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 (11)

1. The method for discriminating the wrong wiring of the three-phase three-wire metering device on line is characterized by comprising the following specific steps:
s1: according to the data to be judged of a first element and a second element in the three-phase three-wire metering device called for and measured by the power utilization acquisition system;
s2: judging the wiring of the metering device according to the data to be judged of the first element and the second element, and identifying the wrong wiring in the metering device;
the first element and the second element are positioned in the metering device and can measure line voltage and/or phase current in data to be judged;
the data to be determined in step S1 further includes: line voltage phase sequence;
the step S2 includes the following steps of determining according to the line voltage phase sequence of the first element and the second element:
s211: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S212: if the angle is less than or equal to minus 65 degrees delta thetaU12Judging the positive phase sequence when the temperature is less than or equal to-55 degrees;
s213: if the angle is less than or equal to 55 degrees delta thetaU12Judging the phase sequence to be the reverse phase sequence if the phase sequence is less than or equal to 65 degrees;
s214: if the angle is less than or equal to minus 130 degrees delta thetaU12Delta theta is less than or equal to-110 degrees or less than or equal to 110 degreesU12And if the angle is less than or equal to 130 degrees, judging that no phase sequence exists, namely the connection is opposite in polarity.
2. The three-phase three-wire metering device wrong wiring online screening method according to claim 1, wherein the data to be judged in the step S1 includes: a line voltage effective value;
the step S2 includes the following steps of determining the connection of the metering device according to the effective values of the line voltages of the first element and the second element:
s201: obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
S202: if (U)12，U32) Is (0, 0), (0, U)L±5％UL)、(UL±5％UL，0)、
Figure FDA0002957954560000011
Figure FDA0002957954560000012
Or
Figure FDA0002957954560000013
If any, the connection is judged to be broken;
s203: if (U)12，U32) Is composed of
Figure FDA0002957954560000014
Or
Figure FDA0002957954560000015
Judging that the wiring is broken or has opposite polarity;
s204: if (U)12，U32) Is (U)L±5％UL，UL±5％UL) If so, judging the wiring to be normal;
s205: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure FDA0002957954560000021
And
Figure FDA0002957954560000022
judging that the wiring voltage is low by the two special values;
s206: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure FDA0002957954560000023
The special value judges that the wiring voltage is higher.
3. The three-phase three-wire metering device wrong wiring online screening method according to claim 1, wherein the data to be judged in the step S1 further includes: the effective value of the phase current;
the specific steps of determining according to the phase current effective values of the first element and the second element in step S2 are as follows:
s221: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of three-phase three-wire metering devicenMaximum current I of three-phase three-wire metering devicemax；
S222: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s223: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s224: if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
4. The three-phase three-wire metering device wrong wiring online screening method according to claim 1, wherein the data to be judged in the step S1 further includes: phase current phase sequence;
the specific steps of determining according to the phase-to-phase current sequences of the first element and the second element in step S2 are as follows:
s231: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S232: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s233: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
5. The three-phase three-wire metering device wrong wiring online screening method according to claim 1, wherein the data to be judged in the step S1 further includes: reactive power and power factor;
the specific steps of calculating the power factor angle of each element according to the reactive power and the power factor of the first element and the second element in step S2 are as follows:
s241: determining the phase angle difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s242: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s243: and performing in-phase matching on the voltage and the current by using the load condition or the data of the adjacent metering points, and identifying wrong wiring.
6. The three-phase three-wire metering device wrong wiring online screening method according to claim 5, characterized in that the power factor angle in step S242 is calculated as follows:
s2421: power factor through the first element
Figure FDA0002957954560000031
And power factor of the second element
Figure FDA0002957954560000032
Respectively calculating the absolute values of the power factor angles of the first elements
Figure FDA0002957954560000033
Absolute value of power factor angle of second element
Figure FDA0002957954560000034
S2422: using formulas
Figure FDA0002957954560000035
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure FDA0002957954560000036
Power factor angle of the second element
Figure FDA0002957954560000037
7. The three-phase three-wire metering device wrong wiring online screening system is characterized by comprising a data acquisition unit and a data identification unit;
the data acquisition unit is used for calling and measuring line voltage effective values, line voltage phase sequences, phase current effective values, phase current phase sequences, reactive power and power factors of a first element and a second element in the three-phase three-wire metering device according to the power utilization acquisition system;
the data identification unit judges the wiring of the metering device according to the line voltage effective value, the line voltage phase sequence, the phase current effective value, the phase current phase sequence, the reactive power and the power factor of the first element and the second element, and identifies the wrong wiring in the metering device;
the specific identification process of the data identification unit comprises the following steps: the wiring of the metering device is judged according to the line voltage phase sequence of the first element and the second element, and the judgment comprises the following specific steps:
s901: obtaining a phase difference Delta theta between line voltages of a first element and a second elementU12；
S902: if the angle is less than or equal to minus 65 degrees delta thetaU12Judging the positive phase sequence when the temperature is less than or equal to-55 degrees;
s903: if the angle is less than or equal to 55 degrees delta thetaU12Judging the phase sequence to be the reverse phase sequence if the phase sequence is less than or equal to 65 degrees;
s904: if the angle is less than or equal to minus 130 degrees delta thetaU12Delta theta is less than or equal to-110 degrees or less than or equal to 110 degreesU12And if the angle is less than or equal to 130 degrees, judging that no phase sequence exists, namely the connection is opposite in polarity.
8. The three-phase three-wire metering device wrong wiring online screening system according to claim 7, wherein the specific identification process of the data identification unit comprises the following steps: judging the wiring of the metering device according to the effective values of the line voltages of the first element and the second element, wherein the judging steps are as follows:
s801: obtaining a line voltage effective value U of a first element and a second element12、U32And the rated line voltage U of the metering deviceL；
S802: if (U)12，U32) Is (0, 0), (0, U)L±5％UL)、(UL±5％UL，0)、
Figure FDA0002957954560000041
Figure FDA0002957954560000042
Or
Figure FDA0002957954560000043
If any, the connection is judged to be broken;
s803: if (U)12，U32) Is composed of
Figure FDA0002957954560000044
Or
Figure FDA0002957954560000045
Judging that the wiring is broken or has opposite polarity;
s804: if (U)12，U32) Is (U)L±5％UL，UL±5％UL) If so, judging the wiring to be normal;
s805: if U is12And U32At 0 and UL-5％ULAnd U is12And U32All are excluded
Figure FDA0002957954560000046
And
Figure FDA0002957954560000047
judging that the wiring voltage is low by the two special values;
s806: if U is12And U32Greater than UL+5％ULAnd U is12And U32All are excluded
Figure FDA0002957954560000048
The special value judges that the wiring voltage is higher.
9. The three-phase three-wire metering device wrong wiring online screening system according to claim 7, wherein the specific identification process of the data identification unit comprises the following steps: judging the wiring of the metering device according to the effective values of the phase currents of the first element and the second element, wherein the judging steps are as follows:
s1001: obtaining effective values I of phase currents of a first element and a second element1、I2Rated current I of three-phase three-wire metering devicenMaximum current I of three-phase three-wire metering devicemax；
S1002: if I1And/or I2Less than 0.05% InIf the first element and/or the second element is/are broken or no load is judged;
s1003: if I1And/or I2Is greater than ImaxJudging that the first element and/or the second element are overloaded;
s1004: if I1And/or I2Greater than 0.05% InAnd is less than ImaxAnd judging that the current of the first element and/or the second element is normal.
10. The three-phase three-wire metering device wrong wiring online screening system according to claim 7, wherein the specific identification process of the data identification unit comprises the following steps: judging the wiring of the metering device according to the phase current sequence of the first element and the second element, wherein the judging specific steps are as follows:
s1101: obtaining a phase difference Delta theta of phase currents of a first element and a second elementI12；
S1102: if Δ θI12If the value is more than 0, judging the positive phase sequence;
s1103: if Δ θI12If the phase difference is less than 0, the phase difference is judged to be the reverse phase sequence.
11. The three-phase three-wire metering device wrong wiring online screening system according to claim 7, wherein the specific identification process of the data identification unit comprises the following steps: the wiring of the metering device is judged according to the reactive power and the power factor of the first element and the second element, and the judgment comprises the following specific steps:
s1201: determining the phase angle difference between the phase voltage and the reference voltage by using the line voltage phase sequence with a certain line voltage as the reference;
s1202: calculating to obtain the phase angle difference between the two-phase current and the phase voltage and the phase angle difference between the reverse current of the two-phase current and the phase voltage by using the power factor angle and the phase angle difference between the phase voltage and the reference voltage;
s1203: carrying out in-phase matching on the voltage and the current by utilizing the load condition or the data of adjacent metering points, and identifying wrong wiring;
the power factor angle calculation step in step S1202 is as follows:
s1211: power factor through the first element
Figure FDA0002957954560000051
And power factor of the second element
Figure FDA0002957954560000052
Respectively calculating the absolute values of the power factor angles of the first elements
Figure FDA0002957954560000053
Absolute value of power factor angle of second element
Figure FDA0002957954560000054
S1212: using formulas
Figure FDA0002957954560000055
Reactive power Q combined with first element1Reactive power Q of the second element2And step S2421, calculating the power factor angle of the first element
Figure FDA0002957954560000056
Power factor angle of the second element
Figure FDA0002957954560000057
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