岩滩扩建工程500 kV变电站雷电侵入波过电压研究

500kV变电站一旦发生雷害事故,将直接影响整个电力系统的安全可靠运行,雷电侵入波沿线路传入变电站会引起站内电气设备出现过电压,严重威胁到设备的绝缘水平。为确保变电站内电气设备能在避雷器保护范围内安全运行,基于岩滩水电站扩建工程500kV变电站新的接线方式,建立了水电站设备数值模型,并采用电磁暂态分析程序ATP/EMTP对设备过电压进行了仿真计算。结果表明,岩滩水电站变电站进线段杆塔绝缘性强;500kV线路绕击侵入波是重点防范对象;工频电压对500kV变电站的雷电侵入波过电压影响显著。

Study on Lightning Intruding Overvoltage in 500 kV Substation of Yantan Extension Project

500 kV substation is especially important to the grid of our country, once it encounters lightning damage, safety and reliability of the whole power system will be directly affected. As lightning intruding waves will cause overvoltage on electric equipments by intruding from the transmission line, which seriously influences the insulation level of equipments, so it is essential to calculate overvoltage on electric equipments when substation struck by lightning to ensure their safe operation under the protection of arrester. As for the new connection mode of extension project of Yantan 500 kV substation, numerical model of hydropower equipments is established and electromagnetic transient simulation calculation software of ATP/EMTP is used to calculate overvoltage on the electric equipments. According to the result, conclusions about strong insulating of incoming line towers, importance of lightning shielding failure intruding waves and influence of power frequency voltage on lightning intruding overvoltage in 500 kV substation can be drawn.