一起双电源小电流接地系统异名相两点接地短路故障分析

Analysis on A Two Points Ground Fault Occurred in Different Phases of Small Current Grounding System with Two Power Supply

摘要:

以一起 35 kV 线路单相接地演变为异名相两点接地短路故障，最终引起主变压器跳闸故障为实例，通过站内 故障录波波形分析，进而推测故障点及演变形式。通过故障电流及已知参数测算线路故障点范围，提高了线路故障 点排查效率，对同类型故障分析有一定参考意义。

Abstract:

A case is introduced that a single － phase grounding in 35 kV line develops two points ground fault occurred in different phases，which causes a transformer to be cut off． In order to find the fault point and its evolution，the waves of current and voltage recorded in substation when the fault happened are analyzed． The fault range is calculated with the fault current and the known parameters，which improves the efficiency of fault detection and provides some references for fault analysis of the same kind．