Field integral detecting system of three-phase electric energy measuring system of electric distribution network

Abstract

The invention discloses a field integral detecting system of a three-phase electric energy measuring system of an electric distribution network, which is mainly composed of a portable adjustable three-phase voltage and electric energy meter, an electric energy meter verifier, a three-phase active electric energy meter field measuring circuit and a three-phase active electric energy meter standard measuring circuit. According to a V-V connection method or a Y-Y connection method, a primary loop of a high-voltage current transformer of the field measuring circuit is connected with a standard high-voltage current transformer in series, and a voltage transformer loop of the field measuring circuit is connected with a standard voltage transformer in parallel. With the field integral detecting system of the three-phase electric energy measuring system of the electric distribution network, the comprehensive error is minimized, and the accuracy of the measuring device is improved by integral test. The system directly, truly and accurately measures the integral operating performance of the electric energy measuring system of a three-phase power supply system of the electric distribution network.

Description

technical field [0001] The invention relates to a detection and verification device for an electric energy meter, in particular to an operating performance detection system for a three-phase electric energy metering device in a distribution network, which is specially used for on-site overall operating performance detection of an electric energy metering device for a three-phase power supply system in a distribution network, and is especially suitable for The overall verification (verification) of the electric energy metering device composed of high-voltage three-phase combined transformers. Background technique [0002] In the 3kV ~ 35kV distribution network, the installation of electric energy metering and metering devices in the three-phase power supply system basically adopts the three-phase three-wire (V-V) wiring method, which is widely used in both urban power grids and rural power grids. That is to say, the electric energy measurement of this system is carried out in...

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Problems solved by technology

[0004] The power consumption reflected in the trade settlement of the three-phase power supply system is represented and displayed by the electric energy meter in the last link of the system. Although the relevant national standards stipulate the accuracy level of each device in the metering system, but Their errors can be positive or negative within a certain level of accuracy. For example, the error of TV is +0.1%, the error of TA is +0.1%, and the error of electric energy meter is also +0.1%. The error of the electric energy meter does not exceed 0.2%, but theoretically speaking, the actual error of the metering system is 0.3%, which exceeds the actual detection error of the electric energy meter, and also exceeds the nominal 0.2 level on the nameplate of the electric energy meter

Therefore, in the periodic verification or measurement arbitration of the metering system, it is not convincing to explain the accuracy of the entire metering system only based on the error of the electric energy meter, and the method and conclusion of such verification do not conform to the actual operation of the metering system. Happening

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