基于TEV检测的10kV开关柜中局部放电定位方法

TEV-based Location Method of Partial Discharges on 10 kV Metal-Clad Switchgears

研究了基于暂态地电压法(Transient Earth Voltage,TEV)的开关柜局部放电定位问题,针对传统定位方法存在的主要问题,提出了一种局部放电脉冲自动提取与匹配方法。利用Akaike信息准则法(Akaike Information Criterion,AIC)进行信号时间差的自动精确求解,根据多路信号时间差实现局部放电定位。基于该方法组建了包括四通道传感器、高速采集卡及上位机可视化处理软件等的便携式检测系统,实现了TEV波形的采集、显示、波形分析及信号时间差的自动确定方法,实现局部放电源的自动定位。最后利用试验证明了该方法较传统仪器所使用的阈值法确定时间差效果更加准确。

TEV-based location method of partial discharges on 10 kV metal-clad switchgears is studied. To deal with some problems in the application of traditional method, an automatic extraction and match method of partial discharge signals is presented. Akaike Information Criterion （AIC） method is applied to determine the signal arrival time difference automatically between different sensors, therefore the PD location can be calculated. A portable detection system is established using the proposed automatic methods, including 4-channel sensors, data acquisition card, and PC software, which realizes the collection, display, analysis and location of PD signals automatically. At last experiment is conducted to prove that the proposed method is more effective than traditional detection system using threshold method.