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电网技术  2006 

我国±800kV特高压直流输电线路外绝缘面临的问题

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Keywords: ±,800,kV直流特高压,线路,换流站,外绝缘,高海拔,污秽,覆冰,覆雪,高电压绝缘技术

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Abstract:

我国已规划了多条±800kV特高压直流输电线路的建设,由于没有设计和运行经验,污秽、覆冰(雪)、酸雨(雾)和高海拔下的外绝缘选择将是其面临的关键技术之一。作者以国内外现有研究成果为基础,阐述了我国特高压直流输电线路外绝缘选择的特殊性,污秽、覆冰(雪)、酸雨(雾)和高海拔等对特高压直流绝缘子放电特性的影响,高海拔下长空气间隙的放电特性。指出污秽、覆冰(雪)、酸雨(雾)和高海拔是影响特高压直流输电线路绝缘子、空气间隙电气特性和外绝缘选择的重要因素,提出在应用现有方法进行特高压直流外绝缘选择时必须考虑污秽、覆冰(雪)、酸雨(雾)和高海拔的影响并加以修正。

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