水力发电厂GIS升压站雷电侵入波阻碍电抗器研究

水力发电厂GIS升压站因场地限制,多采用长管道方式与户外场相连,在断路器开断时遭受雷击容易发生GIS内部件击穿事故。以某水力发电厂发生的雷电侵入波故障为分析对象,首先,采用电磁暂态分析软件ATP-EMTP建立升压站雷击分析模型,对断路器开断状态下的雷电侵入波过电压进行了量化计算,指出雷电侵入波故障原因;然后,对户外场加装避雷器和出线杆塔安装线路避雷器两种侵入波防治手段进行了有效性分析,指出常规防雷手段无法解决该水电站雷电侵入波防治问题;最后,提出了一种雷电侵入波阻碍电抗器设计思路,建立了该电抗器的分布参数模型,通过仿真计算验证了该防雷措施的有效性。所提供的防雷思路对雷电多发地区水电站GIS升压站防雷具有重要参考价值。

Research on Blocking Reactor of Lightning Invasion Wave in GIS Booster Station of Hydropower Plant

GIS booster station of power plant is usually connected with outdoor field by long pipeline due to site limitation,and breakdown accidents of GIS internal parts usually happen when the breaker is disconnected due to lightning strike.Taking the lightning surge fault in a hydropower plant as analyzing object,the lightning surge analysis model of booster station is established with the electromagnetic transient analysis software ATP-EMTP.The lightning surge overvoltage under the condition of breaker disconnection is calculated quantitatively,and the cause of lightning surge fault is pointed out.Effectiveness analysis of adding lightning arrester for the plant and installing line arrester are carried out,and it is pointed out that the conventional lightning protection methods could not solve the problem of the prevention and control of lightning invasion wave in hydropower GIS station.A design idea of blocking reactor for lightning invasion wave is presented,the distributed parameter model of the reactor is established,and the effectiveness of the proposed protection measures against lightning is verified by simulation.The proposed idea of lightning protection has an important reference value for lightning protection of GIS booster station in hydropower station in lightning prone area.