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Method for judging wrong wiring of electric energy meter based on apparent power estimation

An electric energy meter and wrong wiring technology, which is applied in the field of judging the wrong connection of electric energy meters based on apparent power estimation, can solve the problems of difficult connection analysis, inability to collect phase angles, etc., so as to reduce manpower and material resources, realize automatic management, improve Judgmental Efficiency Effects

Inactive Publication Date: 2011-04-27
STATE GRID ZHEJIANG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most remote data acquisition systems for energy meter information do not have or cannot collect phase angles, and can only provide scalar values ​​of three-phase current and three-phase voltage. According to traditional methods, it is difficult to analyze wrong wiring

Method used

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  • Method for judging wrong wiring of electric energy meter based on apparent power estimation
  • Method for judging wrong wiring of electric energy meter based on apparent power estimation
  • Method for judging wrong wiring of electric energy meter based on apparent power estimation

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment one: if figure 2 As shown, the method includes the following steps:

[0049] 1) The sampling and calculation module of the electric energy meter regularly collects three-phase current, three-phase voltage, active power and reactive power;

[0050] 2) The communication module of the electric energy meter sends the data regularly collected by the sampling and calculation module to the main station through the collection terminal, and stores them in the database of the main station;

[0051] 3) The wrong wiring analysis module of the master station calls the data of current, voltage, active power and reactive power collected by the same electric energy meter at the same time point in the database;

[0052] 4) The miswiring analysis module calculates the estimated value of apparent power and the actual apparent power according to the data called; for a three-phase four-wire electric energy meter, the estimated value of apparent power S'=UaIa+UbIb+UcIc or (Ua+Ub...

Embodiment 2

[0057] like image 3As shown, the difference from Embodiment 1 is: 1. Before calculating the estimated power value and the actual apparent power value, first judge the size of the current value at this time point, if the current value is less than m, then re-take the value from the database To eliminate the current, voltage, active power and reactive power values ​​at the point when the current is small, and improve the estimation accuracy. 2. Replace the calculated apparent power estimated value and the actual apparent power value with the estimated apparent power average value and the actual apparent power average value, and use the relative value between the calculated apparent power estimated average value and the actual apparent power average value The difference is used as the basis for judgment.

[0058] above Figure 1-3 The shown method for judging the misconnection of electric energy meters based on apparent power estimation is a specific embodiment of the present ...

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Abstract

The invention relates to a method for judging the wrong wiring of an electric energy meter based on apparent power estimation, belonging to the field of the electric energy measurement of a power system. At present, usually the phase angle of current and voltage is detected to judge the wrong wiring of the electric energy meter, and devices such as an on-site calibrator and the like are needed to carry to a site for detection during operation, which causes low efficiency. By using the method, the scalar values of the three-phase current and the three-phase voltage which are collected by the electric energy meter in a timing way are used for estimating the apparent power, and the possibility of the wrong wiring is judged according to the comparison of differences between the estimated apparent power and the actual apparent power. The method realizes large-scale, long-distance and continuous judgment, replaces a method of using the phase angle of the current and the voltage for judging and detecting the wrong wiring of the electric energy meter, improves judgment efficiency, reduces manpower and material resources, and achieves automatic management.

Description

【Technical field】 [0001] The invention relates to the field of electric energy metering in electric power systems, in particular to a method for judging wrong wiring of electric energy meters based on apparent power estimation. 【Background technique】 [0002] At present, the wrong wiring of the electric energy meter is usually checked by the phase angle of the current and voltage. In actual operation, it is often necessary to carry on-site calibrator and other equipment to the site for inspection. If the remote data acquisition system can be used to make judgments, the work efficiency can be greatly improved. However, most remote data collection systems for energy meter information do not have or cannot collect phase angles, and can only provide scalar values ​​of three-phase current and three-phase voltage. According to traditional methods, it is difficult to analyze wrong wiring. 【Content of invention】 [0003] The technical problem to be solved and the technical task p...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 李熊王伟峰唐学东宣玉华陶晖唐森木
Owner STATE GRID ZHEJIANG ELECTRIC POWER
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