带串补装置的超高压输电长线行波差动保护研究

Research on traveling-wave differential protection for EHV transmission line with series compensated capacitor

行波差动保护基于输电长线两侧方向性行波差值判断故障,可避开电流差动保护对电容电流的补偿问题,仿真验证表明,对于带串补超高压输电长线,行波差动保护在高阻故障时灵敏度高,动作速度快,具有良好的应用前景消除容性电流的影响,从而可有效应用于带串补偿装置的超高压输电长线这类特殊结构的线路保护。

Based on directional traveling - wave difference both sides of the EHV transmission line, traveling - wave differential protection can distinguish fault, avoid the matter of compensation for capacitive current of current differential protection, and also eliminate the effects of capacitive current. Thus it can effectively used in protection of EHV transmission line with series compen- sated capacitor. EMTP simulation results show that the proposed scheme operates sensitively, rapidly and selectively, demonstrating good potential in field applications.