Tap switch state evaluation method based on electric arc electromagnetic radiation signal

Abstract

The invention discloses a tap switch state evaluation method based on an electric arc electromagnetic radiation signal. According to the method, energy information in a plurality of frequency bands is obtained through the sub-frequency band energy measurement of the electromagnetic radiation signal of an on-load tap switch; with an adaptive arc signal threshold determination method adopted, the electric arc signal energy threshold value of the on-load tap tap switch and the electromagnetic radiation frequency distribution characteristic of an electric arc can be obtained; an electric arc generation position and an electric arc arcing intensity are determined; the electric arc arcing duration and the energy range during each time of electric arc arcing are determined; the operation state of the on-load tap switch is evaluated; and whether an arc fault occurs or not is judged by using an adaptive on-load tap switch state judgment method, and the influence of the arc fault on the on-load tap switch is evaluated. According to the method, the electromagnetic radiation signal is adopted, the response speed can be increased, and the false alarm rate of the arc is effectively reduced through the adaptive arc signal threshold determination method and the adaptive on-load tap switch state judgment method.

Description

technical field [0001] The present application relates to the technical field of state evaluation of transformer equipment, and in particular to a state evaluation method of tap switches based on arc electromagnetic radiation signals. Background technique [0002] On-load tap-changers are widely used in various power transformers and play a key role in on-load voltage regulation, and failures often lead to serious consequences. The on-load tap changer is the only mechanism capable of action in the transformer, which has complex mechanical structure and electrical characteristics. [0003] On-load tap-changer faults can be mainly divided into two types: electrical and mechanical faults, mainly sliding gears, mechanical transmission faults, contact wear and looseness, three-phase gear asynchronous, internal discharge in the oil chamber, and inter-stage short circuit. Among them, when the contacts are worn and loose, the three-phase gears are out of sync, and the internal disc...

AI Technical Summary

Problems solved by technology

[0005] This application discloses a tap changer state evaluation method based on arc electromagnetic radiation signals, in order to solve the technical problems of long response time and high false alarm rate in the prior art arc-related on-load tap changer state evaluation method

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