双星形接线并联电容器组故障定位算法  

Fault Location Algorithm for Double-star-connection Shunt Capacitor Banks

作　　者：张金祥 王相锋 李振东 朱梦鸽 任宝林 王海骅 ZHANG Jinxiang;WANG Xiangfeng;LI Zhendong;ZHU Mengge;REN Baolin;WANG Haihua(Maintenance Branch of State Grid Jibei Power Company,Beijing 102488)

机构地区：[1]国网冀北电力有限公司检修分公司

出　　处：《电力电容器与无功补偿》2019年第5期20-24,37,共6页Power Capacitor & Reactive Power Compensation

摘　　要：并联电容器一直是变电站中故障率较高的设备,而一组电容器中常常有几十台电容器,每一台电容器内部又有数量庞大的串并联元件,这给电容器组快速准确地进行故障定位带来很大困难。文中针对并联电容器组应用较多的双星形接线方式,提出了一种基于中性线不平衡电流的故障定位算法,该算法可以检测出中性点不接地和直接接地的电容器组内部故障的位置与故障元件数量。同时考虑内熔丝电容器和无熔丝电容器的不同,进行了分别推导。利用PSCAD和Matlab建立的仿真模型,验证了电容器单元在单元件单次故障、多元件同时故障和连续故障时所提出算法的可行性。Shunt capacitors have always been the equipment with high failure rate in substation,while there are dozens of capacitors in a group of capacitors and a large number of series and parallel elements inside each capacitor,which makes it very difficult for the capacitor bank to quickly and accurately locate the fault. In this paper,a fault location algorithm based on neutral line unbalanced current is proposed for the application of double wye connection in shunt parallel capacitor banks. At the same time,considering the difference between the fused and fuseless capacitor,the derivation is made respectively. The simulation model established by PSCAD and Matlab is used to verify the feasibility of the algorithm proposed by the capacitorunitinthecaseofsinglefault,multiple fault and continuous fault of the unit.

关 键 词：并联电容器组 双星形接线 故障定位 中性线不平衡电流 

分 类 号：TM53[电气工程—电器]