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高压电器  2015 

基于有限元法的550 kV SF6终端电场分析

DOI: 10.13296/j.1001-1609.hva.2015.10.020, PP. 128-131

Keywords: SF6终端,悬浮电极,电场,有限元方法

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Abstract:

文中首先推导了含悬浮电极时的轴对称结构的有限元方程,然后利用Fortran语言进行了编程,完成了含悬浮电极时的有限方法计算程序的编制工作,并利用该程序计算分析了550kVSF6终端中有无悬浮电极时的电场分布,进行比较。计算分析说明,终端中采用悬浮电极后能有效地降低终端内外表面的最大场强,避免了此处空气中局部放电的发生,提高了终端运行的可靠性。在充SF6气体压力为0.3MPa(表计)时,两种结构的终端各进行了正负15次峰值为1675kV的雷电冲击电压试验,其中单屏蔽结构的套管有3次在负极性发生了击穿。试验证明,含有悬浮电极结构的终端绝缘可靠性更高。

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