Effect of Isolating Switch Operation on Very Fast Transient Over-voltage in Extra-high Voltage GIS

作者：Xiaohua Wang · 发表于：Gaoya dianqi · 年份：2009 · 被引用次数：1 · 研究领域：Smart Grid and Power Systems、Power Systems Fault Detection、Power Systems and Technologies

The very fast transient over-voltage caused by three operation modes of isolating switch of extra-high voltage GIS in a 550 kV substation is investigated.The transformer winding’s end to ground VFTO waveforms and the voltage waveforms of transformer winding pies between 0 and 1 are obtained.The over-voltage of making and breaking short cable of transformer,over-voltage of longitudinal calculating point to ground of transformer winding,and winding pies longitudinal VFTO are calculated,respectively.The results show that the maximum gradient voltage of 1 to 3 winding pies will exceed the critical value under the condition where the isolating switch operates in mode 3 and the transformer is charged.Therefore,the operation mode 3 should be avoided.