正常运行方式下跨电压等级四回线零序电流补偿系数整定  

Setting of Zero Sequence Current Compensation Coefficient for Four-Circuit Transmission Lines across the Voltage Classes Under Normal Operation

作　　者：姜美玲 何炎 

机构地区：[1]佛山供电局,广东佛山52800

出　　处：《陕西电力》2014年第7期35-38,90,共5页Shanxi Electric Power

摘　　要：跨电压等级同塔四回线路中某一条线路发生接地短路时,故障线路不仅受到同一电压等级非故障线路零序互感的影响,还受到不同电压等级线路零序互感的影响,同时对于超高压线路多采用长距离输电,电容电流的影响也不容忽视。综合分析了四回线路正常运行方式下,一线路发生接地短路时非故障线路零序互感和长线路零序电容电流对零序电流补偿系数的影响,根据公式提出了新的零序电流补偿系数整定方式。最后利用PSCAD仿真结果验证了本文方法更能准确地反映故障位置,且能使两侧的距离Ⅰ段保护范围有交叉,提高了线路接地距离保护性能。When grounding fault occurred in four-circuit transmission lines across voltage classes on the same tower,the fault line is not only affected by the zero-sequence mutual inductance among the same voltage normal line and the different voltage lines,but also affected by the capacitance current because of long distance transmission for EHV transmission lines.A new zero sequence current compensation coefficient setting method is proposed,considering the influences of both zero-sequence mutual inductance and zero-sequence capacitive current in four-circuit transmission lines across the voltage classed on same tower under normal operation.Finally,the PSCAD simulation results prove that this method can more accurately reflect the fault location,and ensure the overlap of protection zone,which improve the performance of ground distance protection compared with the traditional method.

关 键 词：跨电压等级 零序互感 电容电流 零序电流补偿系数 

分 类 号：TM733[电气工程—电力系统及自动化]