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特高压直流线路复合绝缘子悬挂方式对其冲击闪络特性的影响

DOI: 10.13336/j.1003-6520.hve.2015.04.026, PP. 1272-1277

Keywords: 复合绝缘子,悬挂方式,冲击闪络特性,电场分布,有限元仿真,特高压直流

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Abstract:

V串绝缘子在输电线路中得到了广泛应用,但其与I串绝缘子的冲击闪络特性差异尚不明确。为此,在特高压工程技术(昆明)国家工程实验室开展了V串和I串悬挂方式的±800kV复合绝缘子在操作冲击和雷电冲击作用下的放电试验,并通过有限元仿真软件对2种悬挂方式下复合绝缘子附近的电场分布进行仿真分析。结果表明当有效绝缘距离相同时,正极性冲击电压下的V串绝缘子50%冲击放电电压低于I串绝缘子,而负极性冲击电压下的V串绝缘子50%冲击放电电压高于I串绝缘子;V串缘子下均压环与横担间的空气间隙的电场分布更接近棒-板间隙,而I串绝缘子2个均压环间的空气间隙的电场分布更接近棒-棒间隙。因此,I串和V串绝缘子间冲击闪络特性的差异是由于电极结构的极性效应引起的。

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