Electronic type current mutual inductor fault identification method based on waveform inversion

Abstract

The invention provides an electronic type current mutual inductor fault identification method based on waveform inversion, which aims to solve the problem existed in an electronic current type mutualinductor fault judgment based on the rogowski coil principle in an existing electric power system. The method comprises the steps that an instantaneous current sudden change amount is input into an input end of an electronic type current mutual inductor, and the output waveform of the output end of the electronic type current mutual inductor is sampled; whether the output waveform is distorted ornot can be determined, whether a system fault except the fault of the non-electronic current type current mutual inductor exists or not can be determined; when the output waveform is distorted, the output waveform is subjected to differential re-integration inversion operation, and when the inversion fails, it is determined that the electronic type current mutual inductor has a fault. According tothe method, the fault points can be accurately positioned according to the inverted waveform features, and technical support can be provided for reliability research and digital relay protection of the electronic type current mutual inductor, and technical support can be provided for the applicability of the electronic type current mutual inductor.

Description

technical field [0001] The invention relates to the related technical field of electronic current transformers, specifically, aiming at the fault characteristics of electronic current transformers based on the Rogowski coil principle, it relates to a fault identification method for electronic current transformers based on waveform inversion. Background technique [0002] Electronic current transformers have been widely used in power systems. At present, electrical and electronic current transformers based on the principle of Rogowski coils are still the mainstream products in the market. However, because the output of the electronic current transformer based on the Rogowski coil principle is a differential signal, it must be restored through the integral link. This process will cause some original signals to be lost. The output waveform is used to judge the working condition of the electronic current transformer to investigate and deal with its fault points. [0003] Most o...

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Problems solved by technology

[0005] The present invention is aimed at the electronic current transformers based on the Rogowski coil principle widely used in the existing power system, and its fault discrimination is mostly by adding measuring points on the electronic current transformer collector or using a typical fault model and adopting a database comparison method To achieve fault identification, because the faults of electronic current transformers cannot be predicted at present, resulting in poor effectiveness, a fault identification method for electronic current transformers based on waveform inversion is provided

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