配电网中性点接地方式混连运行分析

Analysis of Hybrid Grounding Operation of Distribution Grid

通过建模仿真研究了配电网中性点接地方式混连运行时的调谐过电压以及发生单相接地故障时的系统过电压水平和保护配置及故障选线装置的动作情况。得出了配电网中性点混连运行时的系统过电压水平优于消弧线圈接地方式,与小电阻接地方式一致,仿真结果与实际情况相符;混连接地方式下,发生单相接地故障时,小电阻接地方式保护配置不受影响,消弧线圈接地方式有利于提高故障选线的准确性。

This paper researches on the modeling and simulation of distribution grid neutral hybrid grounding mode even when running mixed tuned voltage and single-phase operation over voltage level and protection configuration and fault line selection device when the system grounding fault. It concludes that the system over voltage level is better than the arc suppression coil grounding mode,which is consistent with the small resistance grounding method,and the simulation results are in line with the actual situation. When single-phase grounding fault occurs in the hybrid grounding mode,the protection configuration of the small resistance grounding mode is not affected,and the grounding mode of arc suppression coil is advantageous to improve the accuracy of fault line selection.