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空间电荷对不同老化状态油纸绝缘击穿特性的影响

DOI: 10.13336/j.1003-6520.hve.2015.09.034, PP. 3066-3072

Keywords: 油纸绝缘,空间电荷效应,击穿电压,老化状态,预压效应,陷阱密度,电声脉冲法

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Abstract:

为研究高压直流(HVDC)输电系统中油纸绝缘的老化状态与空间电荷效应对其击穿特性的影响,采用加速热老化处理得到3种不同老化程度的油纸绝缘试样,通过同极性不同幅值的预压方式注入空间电荷,测量其击穿电压;采用电声脉冲法(PEA)在室温下观察试品的空间电荷分布,进一步分析了油纸内部的电场分布情况和陷阱分布特性。实验结果表明经3kV同极性预压后试品的击穿电压整体高于未经预压处理的试品;且随着油纸绝缘老化程度的加剧,介质内部浅陷阱密度增大;随着电荷注入量的逐渐增加、电荷效应的增强,击穿电压有所提高。但经4kV同极性预压后试品的击穿电压整体低于经3kV同极性预压后试品的击穿电压;因此,在实际运行中,同极性预压幅值超过一定阈值时反而会出现击穿电压降低的现象,应引起特别注意。

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