摘要
针对单芯电力电缆行波测距过程中交叉互联接头对行波信号反射率高造成行波测距辨识困难的问题,提出了一种无源耦合方法,即利用电容的高通特性,在交叉互联箱增加耦合电容,降低行波信号在交叉互联处的反射率。对某一型号单芯电缆和中间接头波阻抗进行了理论计算,对正常交叉互联方式、无源耦合方式和直接短接方式进行了EMTP仿真分析和110 kV电缆行波测距实验,验证了无源耦合方法能有效降低行波信号在交叉互联处的反射率。使用电容器的无源耦合方法,能有效提高行波测距的效率,同时对工频感应电压和感应电流的影响很小,具有良好的应用前景。
According to travelling wave fault location’s difficult problem caused by the high travelling wave refectivity at cross-connecting joint of single-core cable,a passive coupling method is introduced.Based on the high-pass characteristic of capacitor,this method adds coupling capacitor at cable cross-connected box,thereby reducing the travelling wave refectivity at cross-connecting joint.The wave impedance of single-core cable and intermediate joint is theoretically calculated.The normal cross-connecting method,the passive coupling method and direct short method is simulated and analyzed by EMTP,then is really tested on 110 kV cable’s travelling wave fault location.It is verifed that the passive coupling method has lower refectivity for travelling wave signal.The passive coupling method which use capacitor can effectively raise the effciency of travelling wave fault location,while has little infuence on induced voltage and induced current at industrial frequency,and has a good application prospect.
作者
时振堂
黎德初
李志远
刘维功
孙进
李琼
SHI Zhentang;LI Dechu;LI Zhiyuan;LIU Weigong;SUN Jin;LI Qiong(SINOPEC Dalian Research Institute of Petroleum and Petrochemicals,Dalian 116045,China;SINOPEC Guangzhou Company,Guangzhou 510726,China;SINOPEC Department of Production and Operation Management,Beijing 100728,China)
出处
《电气应用》
2020年第12期14-19,共6页
Electrotechnical Application
基金
中国石油化工股份有限公司科技项目(316087)。
关键词
单芯电缆
行波测距
交叉互联
电容耦合
single-core cable
travelling wave fault location
cross-connecting
capacitor coupling
