Method and system for determining low-voltage line loss of transformer area and operation errors of electric energy meters

Abstract

The invention provides a method and system for determining low-voltage line loss of a transformer area and operation errors of electric energy meters. According to the method and the system, based onthe tree topology of the transformer area and a total score mathematic relation, a transformer area low-voltage line loss model is built by using the Kirchhoff law, and an electric energy meter operation error mathematic model is built according to the energy conservation law; collected total meter power supply data and sub-meter freezing power consumption data are substituted into the operation error mathematical model to obtain a group of equations; the equations are solved to determine the equivalent resistance of each branch of the transformer area and the calculation error of each metering point; and the loss of a low-voltage line and the operation error of each metering point are determined according to the branch equivalent resistance and the calculation errors. According to the method and the system, the accurate values of the low-voltage line loss and the fixed loss of the transformer area can be obtained by utilizing big data and only knowing the total meter and the sub-meterof the transformer area, the power supply quantity of the total meter of the transformer area and the freezing power consumption of the sub-meters without knowing the real power topology of the transformer area, so operation is simple, and efficiency is extremely high.

Description

technical field [0001] The invention relates to the field of electric power data analysis, and more specifically, relates to a method and a system for determining the loss of low-voltage lines in a station area and the operating error of an electric energy meter. Background technique [0002] The traditional method of calibrating the measurement error of the electric energy meter is to compare the electric energy meter to be calibrated with a standard device with a higher accuracy level to obtain the error of the electric energy meter. Typical examples include using high-accuracy electric energy meters in the laboratory to calibrate low-accuracy electric energy meters; The measurement difference of the tester in the same period of time can be used to obtain the operating error of the electric energy meter. [0003] The traditional method requires on-site verification or dismantling of the smart energy meter installed in operation for laboratory verification, which mainly ha...

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Problems solved by technology

[0008] In order to solve the technical problem of using the energy conservation law to calculate the operating error of the metering point in the prior art, the loss rate of the low-voltage line is used as a fixed value to make the calculated operating error of the metering point inaccurate. The present invention provides a method for determining the loss of the low-voltage line in the station area and the method for the operation error of the electric energy meter, the method includes:

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