A Generator Partial Discharge Type Identification Method Based on Time-Domain Pulse Feature

Abstract

The invention relates to a method for identifying the partial discharge type of a generator based on time-domain pulse characteristics, comprising the steps of: 1) installing a VHF capacitive sensor on a three-phase outlet bus; 2) connecting the VHF capacitive sensor through a high-frequency signal line In the amplification filter module; 3) the threshold filtering module is connected after the high-speed acquisition module; 4) the windowed pulse identification module is connected to the threshold filtering module; 5) the windowed pulse identification module is followed by a classification and recombination module. The beneficial effects of the present invention are: adopting the generator partial discharge type identification method based on the time-domain pulse characteristics overcomes the serious field interference in the identification method through the discharge spectrum feature, because the environment of each field is different, and the interference type is different It also overcomes that when the spectrum of pulse-shaped interference is close to the actual discharge spectrum, it is easy to misjudgment, and when multiple discharges exist at the same time and overlap each other, it is easier to misjudgment or miss when using neural network algorithm identification Judgment and other issues.

Description

technical field [0001] The invention relates to the technical field of large-scale generator insulation monitoring, and in particular includes a generator partial discharge type identification method based on time-domain pulse characteristics. Background technique [0002] At present, the insulation monitoring of large generators is mainly based on partial discharge monitoring. Partial discharge is the most sensitive precursor information before insulation breakdown failure of high-voltage power equipment. , without passing through the conductors to which the voltage is applied (breakdown has not yet occurred). There are many reasons for the generator to cause partial discharge, which can be generally divided into two categories: one is that during the production and transportation of the generator, the potential hidden danger of the generator is caused by the substandard process, which generally manifests as discharge at the end of the generator wire rod; During operation,...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the partial discharge of the generator is all through the identification of the characteristics of the discharge spectrum to achieve the purpose of identifying the type of partial discharge defects. Since the on-site interference is relatively serious, and the environment of each site is different, the interference type is also different. Although the identification method can identify the discharge type to a certain extent, it also has certain limitations. When the spectrum of the pulse-shaped interference is close to the actual discharge spectrum, it is easy to make a misjudgment. In addition, when multiple discharges exist at the same time and interact with each other When superimposing, use neural network algorithm to identify, it is more likely to produce misjudgment or missed judgment

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