基于EMTP-RV的GIS变电站雷电过电压研究——以厄瓜多尔辛克雷水电站送出工程为例

Research on lightning overvoltage of GIS substation based on EMTP-RV:case of transmission line project of Sinclair Hydropower Station in Ecuador

利用EMTP-RV电磁暂态仿真软件,建立了厄瓜多尔新建230 kV GIS变电站的仿真模型。运用该模型,计算了在雷电波不同侵入方式、雷击进线段不同杆塔与变电站不同运行方式下变电站内主要设备的雷电过电压水平,并对各个设备的绝缘配合进行了校核。计算结果表明:(1)雷击点距离变电站越近,雷电侵入波的过电压越高;(2)通常在单变压器、双母线与双回路线路运行时,雷击侵入波过电压最高;(3)在各种不同雷击位置与运行方式下,该变电站各主要设备上的雷电过电压均未超过其雷电冲击耐压水平,并具有一定的绝缘配合裕度,满足安全运行的要求。

The simulation model of a new 230 kV GIS substation in Ecuador was established by EMTP-RV electromagnetic transient software.Using the new model,the lightning overvoltage levels of the main equipment in the substation was calculated under different lightning intrusion,different tower and substation operation mode,and the insulation coordination of each equipment is checked.The results showed that the closer the lightning intrusion point is to the substation,the higher the overvoltage of lightning intrusion wave is.Generally,the overvoltage of lightning intrusion wave was the highest in the operation of single transformer,double busbar and double-circuit transmission line.Under different lightning locations and operation modes,the lightning overvoltage on the main equipment of the substation did not exceed its lightning withstand voltage level,and has a certain insulation coordination fit margin,which meets the requirements of safe operation.