大型水电工程变电站雷电波保护和绝缘配合的研究

根据多年从事葛洲坝等大型水电工程变电站雷电侵入波保护和绝缘配合研究的主要成果提出：水电站５００ｋＶ ＧＩＳ可以采用仅装设线路侧避雷器和母线（或联合单元母线）避雷器的简化保护方式；线路侧避雷器应布置在侵入波前沿，与架空进线呈“Ｖ”形或“一”字形连接的重要措施；提出以含投资、运行费和事故损失费的总费用最小为目标，综合评价并按技术安全经济总体效益最佳原则，优选设备绝缘水平的方法。

Study on combination of lightning prevention and insulation in transformer yards of large-scale hydropower projects

According to the research achievements acquired through studying on combination of lightning prevention and insulation of transformer yard in large scale hydro projects such as Gezhouba project, it is derived that GIS (gas insulated switch gear) for 500 KV stations may be simply protected by a line lateral lightning arrestor and a bus line lightning arrestor. The line lateral lightning arrestor should be installed at the flout of intrusive waves to form a V-shape or I-shape with incoming lines. A method of optimally selecting insulation equipment was developed to minimize the total cost of investment, .operation cost and accidents losses, based on the principle of obtaining the best technic-economic benefit.