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高压直流GIL中盆式绝缘子表面电荷积聚与消散的实验研究

DOI: 10.13336/j.1003-6520.hve.2015.05.002, PP. 1430-1436

Keywords: 高压直流,GIL,表面电荷,盆式绝缘子,积聚,消散,静电探头

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Abstract:

研究直流电压下绝缘子表面电荷积聚及其抑制措施,是开发直流气体绝缘管道输电线路(GIL)的一项关键技术。因此建立了一套盆式绝缘子表面电荷测量系统,采用静电探头法,在空气中对施加了直流电压后的环氧树脂盆式绝缘子进行了表面电位的测量,研究了不同极性、不同幅值电压以及极性反转情况下表面电荷的积聚现象,并对表面电荷的消散进行了测量。实验结果表明绝缘子表面电荷分布与所施电压极性密切相关;在0.5MPa空气中,随着施加电压幅值(+40~+70kV)增加,绝缘子表面电荷急剧增加(负电位最大处从-200V增加到-3000V);在0.5MPa空气中,先后施加+70kV及-40kV电压,绝缘子局部表面电荷激增现象明显(正电位最大处由500V增大到超过2500V);在0.1MPa空气中施加+40kV电压,在0~300min内,绝缘子表面电荷消散近似指数衰减过程,时间常数约为104s数量级。

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