基于小波变换的变电站变压器局部放电自动检测方法

An Automatic Detection Method for the Partial Discharge of Transformers in Substations Based on Wavelet Transform

变压器局部放电参数分段采集存储缺少时间阈值的设置,由此导致变压器放电信号接收率变低。本文研究一种利用小波变换方法的变电站变压器局部放电自动检测方法,通过分析放电信号的超声波波形,提取高压变电站变压器的局部放电参数,根据小波变换原理,设置时间阈值,对提取出的参数进行分段采集与存储,建立局部放电参数自动检测算法,通过导出结果,完成局部放电的自动检测,至此,完成基于小波变换的变电站变压器局部放电自动检测方法设计。经过对比实验发现,该方法放电信号接收率最高为87.5%,较其他方法更优越,具有较高的应用价值。

The segmented acquisition and storage of transformer partial discharge parameters lack the setting of the time threshold,leading to lower reception rates of transformer discharge signals.An automatic detection method for the partial discharge of transformers in substations based on wavelet transform is studied in this paper.By analyzing the ultrasonic waveform of discharge signals,the partial discharge parameters of transformers in high-voltage substations are extracted.The time threshold is set according to the wavelet transform principle,the extracted parameters are collected and stored in sections,and an automatic detection algorithm for partial discharge parameters is established.The automatic detection of partial discharge is completed by deriving the results.So far,the design of automatic detection method for the partial discharge of transformers in substations based on wavelet transform is completed.With comparative experiments,it is found that the discharge signal reception rate of the proposed method is up to 87.5%,which is superior to other methods and proves higher value in application.