超高压长线相量差动保护的研究

针对超高压长线电容电流对差动保护的影响，使用EMTP分析、比较了普通相量差动保护和故障分量相量差动保护的动作特性。仿真结果表明，对于两端供电超高压长线，带电容补偿的故障分量相量差动保护具有明显地高灵敏度和选择性；仿真结果还显示，在单侧电源和空投于故障线路情况下，相量差动保护的各种方案均无法满足实际电力系统继电保护的要求。

STUDY OF CURRENT PHASOR DIFFERENTIAL PROTECTION FOR LONG UHV TRANSMISSION LINE

Considering the influence of capacitive current on long UHV transmission line. the performances of traditionalcurrent phasor differential protection and fault component differential protection are extensively tested by using EMTP on atransmission line with various configurations and operating conditions. The result of simulation indicates that fault componentdifferential protection with capacitive current compensation has high sensitivity and good selectivity on a long UHVtransmission line with power sources at both ends. However, on a long UHV transmission line with power source at one end,or in the case of switching onto faulted line, all the schemes of traditional phasor differential protection can't meet therequirements of protective relaying of real power system.