小电流接地系统两点异相接地的故障分析

Fault Analysis of Two Points Out-Phase Grounding for Small Current Neutral Grounding System

根据实际运行中发生的一起导致主变差动保护动作的故障,分析了不同接地情况下对小电流接地系统运行的影响,给出了线路电流互感器不完全星形接线时,互感器中性线断线对线路保护的影响,对调度和变电运维人员处理相关异常情况具有一定的指导意义。

Based on the fault causing the differential protection action of main transformer in actual operation, this paper analyzes the impacts on the operation of small current neutral grounding system under different grounding conditions, provides the impact of neutral wire break of current transformer on line protection when the current transformer is imperfect star connection, and has a certain guiding significance for dispatchers and operation maintenance personnel of substation to deal with related abnormal conditions.