Checking device and checking method of accuracy of capacitor voltage transformer

Abstract

The invention relates to a checking device and checking method of the accuracy of a capacitor voltage transformer. The method comprises the following steps: (1) selecting a set-up voltage regulator, a capacitor voltage ratio standard device and an error measuring device according to a capacitor voltage transformer to be checked; (2) carrying out field calibration of the voltage-dividing ratio coefficient of the capacitor voltage ratio standard device; (3) connecting the devices; and (4) displaying the ratio difference value and angle difference value of the capacitor voltage transformer to be checked by the error measuring device, and judging whether the accuracy of the capacitor voltage transformer to be checked meets the specification requirement or not according to the ratio difference value and the angle difference value. The checking device and checking method of the accuracy of the capacitor voltage transformer provided by the invention can be used for conveniently and effectively checking the accuracy of the capacitor voltage transformer in the field with high accuracy, and are suitable for checking the accuracy of 220 kV or less capacitor voltage transformers and 0.2V or less capacitor voltage transformers.

Description

technical field [0001] The invention relates to the field of power system metering, in particular to an accuracy verification device and a verification method for a capacitive voltage transformer. Background technique [0002] At present, electromagnetic voltage transformers are widely used in the 220kV power system, but as the power system develops towards large capacity and high voltage, digital measurement, protection, dispatch and control of factories, stations and systems have become a development trend , which puts forward higher and higher requirements for miniaturization, intelligence and high reliability of power equipment. The existing electromagnetic voltage transformer can no longer meet this requirement due to its structural characteristics and existing deficiencies. [0003] Compared with the 220kV traditional electromagnetic induction voltage transformer, the capacitive voltage transformer has the following series of advantages: excellent insulation performan...

AI Technical Summary

Problems solved by technology

[0004] Capacitive voltage transformer is the source of high-voltage measurement. The accuracy of its work directly affects the accuracy of electric energy measurement, which is related to the huge economic benefits of various departments. At present, the accuracy verification of capacitor voltage transformer is not very effective method

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