基于PSCAD的110kV变压器接地方式的优化研究

Optimization of Neutral Grounding Modes of 110 kV Transformer Based on PSCAD

在电网的实际运行中,主变中性点接地方式的选择是一个关系整个电网安全稳定运行的综合性问题。当电网发生接地故障时,合理的选择主变接地方式可以大大减小故障对电气设备的损害。利用PSCAD软件搭建了某地区110kV电网的电磁暂态仿真模型,通过在系统110kV侧不同地点设置单相短路故障,对可能出现的220kV和110kV主变中性点接地方式进行了仿真,给出了110kV电网主变中性点接地方式具体的优化方法及建议。

The selection of neutral grounding modes of main transformer,in the actual operation of power grid,is a comprehensive problem that will affect the safety and stability of power grid.The reasonable selection of neutral grounding mode of main transformer could greatly reduce the damage to electrical equipment when ground faults occur to power grid.This paper uses PSCAD to model an 110 kV power grid,and then investigates probable neutral grounding modes of 220 kV and 110 kV main transformers when the single-phrase grounding fault occurs to the 110 kV side of the grid,then,gives specific optimization measures and proposals for neutral grounding modes of main transformer of 110 kV power grid.