一起电流二次回路非典型相间短路故障分析

Analysis on an Untypical Interphase Short-circuit Fault in Secondary Current Circuit

在一起非典型500 k V线路保护电流二次回路的相间短路故障中,由于短路电阻的存在,导致短路的两相电流出现了换相现象。通过对故障现象进行分析,结合理论计算出短路电阻大小,并借助PSCAD建模加以验证。根据仿真结果分析了短路电阻大小对短路电流的影响,为运维检修人员处理类似缺陷提供了参考。

This paper presents an untypical instance of phase-to-phase short-circuit fault in secondary current fault of500kV line protection.During to the short circuit resistance,the phases of the short-circuit current were inverted.By observation and analysis,the value of fault resistance is calculated,and the phenomenon is verified by PSCAD modeling.The influences of short-circuit resistance on short-circuit current is analyzed by simulation result,which can be referenced by operation and maintenance engineers in dealing with similar defects.