Identification method of insulation defect type of gas-insulated switchgear

Abstract

The invention discloses an identification method of an insulation defect type of a gas-insulated switchgear, which comprises the following steps that 1, a partial discharge ultrahigh frequency signal of the gas-insulated switchgear is collected; 2, filtering and noise reduction are performed on the partial discharge ultrahigh frequency signal; 3, an envelope of the partial discharge ultrahigh frequency signal is obtained; 4, five characteristic values including a pulse peak Vtop, a trough Vv1 which early appears after the pulse peak, a peak Vp1 which early appears after the pulse peak, a trough Vv2 which appears later after the pulse peak and a peak Vp2 which appears later after the pulse peak are extracted from the envelope; 5, the five characteristic values are formed to construct a characteristic aggregate, and three characteristics with the highest degree of differentiation are taken from the characteristic aggregate to construct a three-dimensional characteristic space; 6, sample data of the partial discharge signal which corresponds to a typical partial discharge type are adopted to train a sample space training classifier; and 7, the trained sample space training classifier is used for classifying and identifying the partial discharge type which is mapped to the three-dimensional characteristic space.

Description

technical field [0001] The invention relates to a signal detection method, in particular to a GIS partial discharge signal detection method. Background technique [0002] Gas Insulated Switchgear (GIS) equipment has been widely used in power systems due to its small footprint and high reliability. Gas-insulated combined electrical appliances will generate partial discharges before insulation breakdown occurs due to insulation defects. Partial discharge is a symptom and manifestation of GIS insulation defects. Detecting the phenomenon of partial discharge in GIS can discover its internal insulation defects earlier, so that appropriate measures can be taken to prevent its further development from causing accidents. [0003] Partial discharge in GIS equipment is caused by a series of current pulses with a very short rise time, and it will be accompanied by various physical and chemical phenomena such as sound, light, and chemical products. Therefore, partial discharge in GIS...

AI Technical Summary

Problems solved by technology

[0006] At present, the method commonly used to identify the type of PD is mainly based on the phase distribution spectrum. This method has no PD pulse waveform information, and also needs to provide power frequency phase synchronization information.

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