500kV大型水电站主变压器侧避雷器优化

为了降低大型水电站工程的建设投资,以葛洲坝大江电厂和溪洛渡左岸升压站工程为例,采用EMTP程序建模仿真计算雷电侵入波.计算结果表明：对于开关站和主变压器采用架空线路连接的水电站,在各运行方式下,母线可不安装避雷器,但主变压器侧必须安装避雷器;对于开关站和主变压器采用气体绝缘输电线路（gas insulation line,GIL）连接的水电站,可采用母线和主变压器共用1组避雷器的配置方案.由于大型水电站主变压器较多,且主变压器侧气体绝缘金属封闭开关设备（gas insulated switchgear,GIS）避雷器价格昂贵,优化主变压器侧GIS避雷器,有相当可观的经济效益.采用优化后的避雷器布置方案,500 kV大型水电站有足够高的防雷可靠性.

Arrester Optimization of Main Transformer in 500 kV Large Scale Hydropower Station

： In order to reduce the construction investment of large scale hydropower station, taking Gezhouba Dajiang hydropower station and Xiluodu Left Bank project as examples, this paper simulated and calculated the lightning invasion waves with using EMTP program. The calculation results show that the hydropower station which the connection between main transform and switch station uses overhead line can cancel the installation of arresters at busbar, but arresters should be installed at main transform; the hydropower station which the connection between main transform and switch station uses gas insulation line （GIL） can make busbar and main transform share a set of arresters. The large scale hydropower station always has lot of main transformers, and the arrester price of the gas insulated switchgear （GIS） in main transformer is expensive. So the optimization of GIS arrester in main transformer can bring great economic benefits. With the use of the optimized arrester arrangement scheme, the lightning protection reliability of 500 kV large scale hydropower station can be high enough.