A method and device for checking error of a three-phase electric energy metering device

Abstract

The invention is applicable to the field of electric energy metering, and provides an error verifying method and device for a three-phase electric energy metering device. The three-phase electric energy metering device is composed of three single-phase electric energy metering units which are used to complete the electric energy metering of the line of each phase. Any line of the three-phase electric energy metering device accesses at least one single-phase electric energy metering device with a known global error value to form an error standard device. The three-phase electric energy metering device, each single-phase electric energy metering unit and the error standard device measure the electric energy data of the lines, and report the electric energy data to an error processor to calculate the overall error of the three-phase electric energy metering device according to the load current segment consideration. According to the embodiment of the invention, self-error-checking of the three-phase electric energy metering device is realized; low verification efficiency caused by the need of a specially arranged test environment and specific test instruments in the prior art is overcome; and the problem that a calculated mean error of an electric energy meter cannot be used in industrial error value evaluation in the prior art is solved.

Description

technical field [0001] The invention belongs to the field of electric energy metering, and in particular relates to a method and device for verifying errors of a three-phase electric energy metering device. Background technique [0002] For the three-phase electric energy metering device in use, it is very difficult to determine 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 ...

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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