500 kV GIS变电站雷电过电压保护研究

Lightning Over-voltage Protection for 500 kV GIS Substation

将500 kV GIS变电站和进线段结合起来,考虑绝缘子串冲击伏秒特性、进线段冲击电晕、远近区杆塔冲击接地电阻、落雷点等因素的影响,采用ATP-EMTP对500 kV GIS变电站的雷电侵入波过电压进行了研究。研究表明,冲击电晕、近区杆塔接地电阻对雷电过电压有很大的影响;雷击最靠近变电所终端"门"形塔的杆塔时,过电压有可能不是最严重的;当设备过电压较严重时,母线上增装一组避雷器能有效降低过电压。该研究思路兼顾安全和经济两方面,可为工程提供新的参考。

This paper combines incoming lines with a 500 kV GIS substation to investigate the lightning over-voltage of 500 kV GIS substation via ATP-EMTP simulation program with respect to the influences of impulse voltage-second characteristics of insulator strings, impulse corona of incoming lines, impulse grounding resistance of tower, and position of lightning. The result shows that impulse corona and grounding resistance of the tower which is close to the substation exert great influence on over-voltage, maybe the lightning over-voltage is not the maximum when lightning strike the tower which is close to the terminal door-typed structure, and a group of arresters installed on bus can decrease the over-voltage effectively when the over-voltage of the equipment is very serious. This research takes both safety and economy into account to provide a reference for the lightning over-voltage protection of GIS substations.