500kV无双线线路高抗退出运行的可行性分析

Feasibility Study on Decommissioning of HV Shunt Reactors in 500 kV Wuxin-Shuangjiang Transmission Line

湖南电网500kV无双线经双江500kV变电站T接后,输电线路长度由原来的300km缩短为129km左右,为无双线500kV并联电抗器的退出运行创造了条件。为防止高压并联电抗器发生故障,针对无双线电抗器退出运行后的操作过电压进行了计算,探讨电抗器退出运行的可行性。计算了避雷器投入运行时高压并联电抗器运行和退出情况下的操作过电压,及避雷器退出运行时高压并联电抗器运行和退出情况下的操作过电压。计算结果表明无双线并联电抗器退出运行时,系统操作过电压可满足运行要求。

The length of the 500 kV Wuxin-Shuangjiang transmission line in Hunan power grid after passing the 500 kV substation T connection was reduced from the original 300 km to about 129 km,which facilitated the decommissioning of 500 kV shunt reactors.To prevent failures of HV shunt reactors,operation overvoltage of Wuxin-Shuangjiang line after the decommissioning of HV shunt reactors was calculated and the decommissioning feasibility was discussed.The study includes switching overvoltage under different conditions.Results proved the feasibility of HV shunt reactor decommissioning in the Wuxin-Shuangjiang transmission line.