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电网技术  2010 

考虑GIS外壳传输特性的VFTO计算模型

, PP. 203-207

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Abstract:

在计算快速暂态过电压(veryfasttransientovervoltage,VFTO)时,全封闭式组合电器(gasinsulatedswitchgear,GIS)暂态电路的准确搭建直接影响VFTO的计算准确度。结合中国某1100kVGIS变电站,根据多导体传输线理论和相模变换方法,建立了GIS外壳传输特性模型,并与GIS内部暂态模型相结合,详细计算了隔离开关操作时所产生的VFTO,分析了GIS内部关键设备处VFTO的极值、频谱特性及上升率。最后研究了未操作相母线上残余电压对操作相VFTO的影响。研究结果可供GIS设计及连接在GIS上的电气设备绝缘结构设计参考。

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