谐振接地系统单相接地故障选线的优化及仿真

Optimization and Simulation of Fault Line Selection for Single-Phase Grounding in Resonant Grounding System

当谐振接地系统发生单相接地故障时,若消弧线圈可调至全补偿状态,接地电容电流将得到充分补偿,有利于接地电弧熄灭和故障相电压的恢复。如继而瞬时投入并联电阻,不但能消除可能产生的串联谐振过电压,而且能够实现快速、准确地选择出故障线路。介绍了10 kV配电网中性点经可调消弧线圈接地系统发生单相接地故障瞬时并联电阻的仿真模型的建立,并对仿真结果进行了分析。

When the single-phase grounding fault occurs in resonant grounding system,the grounding capacitive current,with the arc suppression coil adjusted to the full compensation state,can receive full compensation,conducive to arc extinction and fault voltage recovery.Then,the instantaneously input parallel resistance can not only eliminate the possible tandem resonant overvoltage,but also select the fault line quickly and accurately.This paper attempts to establish and analyze the simulation model for parallel resistance instantaneously input in case single-phase grounding fault occurs at 10 kV distribution network neutral point with adjustable arc suppression coil.