基于电缆传递函数和信号上升时间的电力电缆局部放电在线定位方法  

On-line Power Cable Partial Discharge Localisation Method Based on Cable Transfer Function and Detected Pulse Rise-time

作　　者：张磊祺 盛博杰[2] 姜伟[1] 周文俊[2] 田智[1] 唐泽洋[2] 

机构地区：[1]国网湖北省电力公司武汉供电公司,武汉430013 [2]武汉大学电气工程学院,武汉430072

出　　处：《高电压技术》2015年第4期1204-1213,共10页High Voltage Engineering

基　　金：中国-苏格兰博士生教育及科研基金(留金欧[2010]6044)~~

摘　　要：为实现电力电缆局部放电(简称局放)在线定位,基于电力电缆局放信号的上升时间和传递函数(RTTF),提出了1种以局放信号的上升时间与传播距离的函数关系为基础的电力电缆局放在线监测定位方法。该方法进行局放定位时只需要在1个测量点监测入射波,不仅可用于在线监测系统,而且可用于长电缆系统的局放定位,其精度取决于电缆、高频电流传感器(HFCT)和高通滤波器的衰减常数和传递函数。通过应用传递函数对局放信号的仿真与实验室数据对比,其相关系数大于0.99,该结果验证了仿真的正确性;另外仿真和在线监测数据表明,RTTF方法是1种有效的局放在线定位方法。We put forward a novel method of partial discharge（PD） localization to realize real-time PD location in power cables. The method is based on the change in PD＇s rising time as a function of the distance that PD pulse travels, and it is named a RTTF method. When this method is used to localize PD, the incident pulse at only one measurement point needs to be detected, thus it is applicable to on-line PD monitoring systems and the PD source localization in long cable systems. Accuracy of the RTTF method depends on the transfer functions and attenuation constant of the cable, the high-frequency current transformer（HFCT） and the applied filter. The simulation results of pulse propagation in cables using the cable transfer function are compared with laboratory experiments, and the correlation coefficient between them is larger than 0.99. Taking into account the simulation results and on-site PD measurements, it is concluded that the proposed RTTF method is useful to PD localization.

关 键 词：电力电缆 局部放电 在线监测 上升时间 传递函数 局放定位 

分 类 号：TM855[电气工程—高电压与绝缘技术]