35kV电缆终端局部放电超声信号特征统计分析

Statistical Analysis of Partial Discharge Ultrasonic Signals Characteristics on 35 kV Cable Terminal

为了实现现场进行35kV电缆终端超声波局部放电检测时对放电位置、放电水平、放电性质的有效分析判断,从而对缺陷原因及其危害程度作进一步分析,结合试验室模拟试验及现场测试结果,通过采用统计学理论分析方法,研究了放电点深度、放电水平的经验计算公式以及局部放电性质的判断方法。结果表明:对于35kV电缆终端,可依据半峰宽度、半峰角度及终端表面最高信号量通过经验公式计算出其放电点深度及局部放电水平,并由k值的大小判断其局部放电性质。

In order to carry on the effective analysis of discharge position,discharge level and discharge properties at ultrasonic detection ofpartial discharge on 35 kV cable terminal to determine the further analysis ofthe defect causes and harm degree ofthe discharge default.Combined with laboratory simulation experiments and field test results,through the theory of statistics analysis formula and method,researched calculation formula of discharge point depth,discharge level of experience and the judging method of partial discharge properties.The results showed that:for the 35 kV cable terminal,according to half peak width,peak angle and terminal surface maximum signal by empirical formula to calculate the discharge depth and partial discharge level,the size of the partial discharge properties and values by K.