Electric energy metering device overall error detecting method, device and system

Abstract

The invention is applicable to the field of electric energy metering and provides an electric energy metering device error self-checking method, device and system. The method comprises the steps that a system to be detected accesses the error criterion device of at least one known overall error value, wherein the error criterion device comprises an electric energy metering chip, a circuit thereof, a voltage sensor and a current sensor; each electric energy metering device and the error criterion device measure and record the respective electric energy data in a preset manner and report the data to a data processor; and an error calculator calculates the overall error of each energy metering device according to received and processed electric energy data and load current segment consideration. According to the embodiment provided by the invention, overall error self-checking of the electric energy metering device is realized; the problems that an overall error cannot be detected; errors of a current transformer and a voltage transformer of the metering device are detected in the field in the case of black out; and a large number of metering devices cannot be detected according to the law in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of electric energy metering, and in particular relates to a method, device and system for checking the overall error of an electric energy metering device. Background technique [0002] For the electric energy metering device in use, it is very difficult to judge whether the metering error is out of tolerance. The main reasons are: 1. The electric energy metering device is usually composed of three components: a current transformer, a voltage transformer and an electric energy meter. Its device error is a composite error calculated from the measurement accuracy of the three components. The use of synthetic error has drawbacks: it is not directly measurable. What's more serious is that the real overall error of the electric energy metering device may be greater than its integrated error and it is not easy to measure. 2. The on-site verification of the current transformer and voltage transformer errors must be carrie...

AI Technical Summary

Problems solved by technology

In order to solve the problem that the overall error cannot be detected in the prior art, the error of the current transformer and voltage transformer of the metering device must be detected on the spot only when the power is cut off, and the problem that the number of metering devices in use is too large to be detected according to laws and regulations

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