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Method for improving the influence of self-heating of electric energy meter on transformer performance and electric energy meter

A technology of electric energy meters and transformers, which is applied in the field of three-phase intelligent electric energy meters of the national grid, can solve the problems of affecting the measurement accuracy and increase of intelligent electric energy meters, and achieve the goal of reducing hardware cost investment, ensuring measurement accuracy, and eliminating additional errors Effect

Active Publication Date: 2021-11-12
HEXING ELECTRICAL +2
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Problems solved by technology

The test shows that the output voltage of the electronic current transformer increases with the increase of temperature, which is specifically reflected in the increase of the error of the electric energy meter with the increase of temperature. This limitation directly affects the measurement accuracy of the smart electric energy meter

Method used

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  • Method for improving the influence of self-heating of electric energy meter on transformer performance and electric energy meter
  • Method for improving the influence of self-heating of electric energy meter on transformer performance and electric energy meter
  • Method for improving the influence of self-heating of electric energy meter on transformer performance and electric energy meter

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The invention compensates based on the characteristic of the output voltage of the electronic current transformer changing with temperature, that is, the characteristic of the error of the electric energy meter changing with the load time. Take 6 three-phase smart meters and run them for 1.5 hours respectively under the conditions of rated maximum current Imax, power factor 1.0L, and rated maximum current Imax, 0.5L. The curve characteristics of the error with time are as follows: figure 1 , figure 2 shown.

[0025] From the data of 6 watches, it can be concluded that under the conditions of power factor 1.0L and 0.5L, the characteristics of the error changing with the load time are the same, and the curves are all linear, and they tend to be stable after 1 hour. Therefore, the first hour can be compensated by adjusting the value of the power gain register ...

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Abstract

The invention relates to a method for improving the influence of the self-heating of the electric energy meter on the performance of the transformer and the electric energy meter, and the method for improving the influence of the self-heating of the electric energy meter on the performance of the transformer comprises the following steps: S1, the electric energy meter regularly judges the electric energy meter every second For the current load, if the ratio of the absolute value of the difference between the current current and the rated maximum current Imax of the electric energy meter to the rated maximum current Imax of the electric energy meter is less than or equal to 2%, perform step S2; S2, if the current current continues to meet the conditions of step S1 to achieve compensation Use the formula n=(Tc-Ts) / Δt to calculate the gain compensation value n at the interval time Δt; S3, read the original power gain from the energy meter memory chip, and add or subtract the gain compensation value n according to the direction of error change, The compensated power gain is obtained, and the compensated power gain is written into the metering chip. The invention reduces the additional error caused by the temperature rise of the electronic transformer under the operating condition.

Description

technical field [0001] The invention relates to a three-phase intelligent electric energy meter of the State Grid, especially a method for improving the influence of the self-heating of the electric energy meter on the performance of the transformer and the electric energy meter, which can reduce the additional energy generated by the temperature rise of the electronic transformer under operating conditions. Errors are mainly used in power systems. Background technique [0002] When the electrical load is large and the electric energy meter terminal flows through a large current, it will generate heat (self-heating). The voltage and current signal measurement of the electric energy meter usually requires voltage and current transformers to further transform and reduce the power grid signal before it can be input to the conditioning circuit. The test shows that the output voltage of the electronic current transformer increases with the increase of temperature, which is speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R1/44
CPCG01R1/44
Inventor 陈昌首张敏扶小飞朱程鹏徐全伟程锐舒元康
Owner HEXING ELECTRICAL
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