500kV3/2接线刀闸解环的计算分析

Calculation and Analysis of Disconnecting 500 kV 3/2 Connection Earthing Knife-switch

针对500 kV 3/2接线的开关拒分故障,用故障开关两侧刀闸解环隔离的特殊操作,运用刀闸解环电弧长度经验公式和计算刀闸母线转换电压两种校验分析方法,代入现场数据,对事故工况时的刀闸解环操作做出了安全可行的分析结论,并对常规3/2接线的刀闸解环操作进行了推广性分析。

Regarding the accident of 500 kV 3/2 connection switch rejected opening,the knife-switch on both sides of the faulted switch were used to disconnect the loop. Two methods were used to analyze the special operation：the experience formula for arc length using knife switch to disconnect loop and calculation of knife-switch busbar switchover voltage, by incorporating field data, a conclusion was made that at emergency condition using knife switch.to discon- nect loop is safe and feasible. It can be used as references for extended application of this operation on conventional 3/2 connection knife switch.