基于AIC准则和时窗能量比的电缆局部放电在线检测与定位

在利用多高频电流传感器进行电缆局部放电在线检测与定位时,针对局放信号初至时刻拾取精度不高影响定位精度的问题,提出一种基于AIC(Akaike''s Information Criterion)准则和时窗能量比的局放故障在线检测与精确定位方法.首先利用时窗能量比检测出局部放电发生的时窗,然后求取确定时窗的局部AIC特征曲线,并基于AIC准则精确拾取局放信号初至时刻.最后,运用到达时间法对局放源进行定位.仿真结果表明,该方法定位精度高,抗噪声干扰能力强,在-2 dB的噪声环境下可实现99.85％的定位准确率,具备工程实用价值.

On line partial discharge detection and localization based on AIC criterion and time window energy ratio

Based on AIC(Akaike''s Information Criterion)criterion and time window energy ratio,the method of PD on-line detection and fault location was proposed to solve the problem that the positioning accuracy was affected by the low picking accuracy of PD signal arrival time,when using the multi high frequency current sensor to realize the online detection and location of partial discharge on cable.Firstly,the time window energy ratio was used to the time window,and the AIC characteristic curve of the certain window was obtained,then the AIC criterion was used to accurately pick up the initial arriving moment of signal.Finally,the PD source was located by the method of arrival time.The simulation results show that this method,which has high engineering practical value,not only has high precision and strong anti-interference ability,but also can achieve 99.85％localization accuracy in-2 dB noise environment.