电压周期变化时表面电荷衰减对局部放电特性的影响

发布时间：2018-03-02 08:03

本文关键词： 局部放电表面电荷衰减电压周期放电时延放电谱图　出处：《高电压技术》2017年01期 　论文类型：期刊论文

【摘要】：为了研究局部放电(PD)特性随电压周期的变化规律,搭建了表面电荷局部放电联合测试系统,并测量了不同电压周期下局部放电序列中表面电荷动态分布以及对应的局部放电参数,随后提出了一种计算放电时延的近似方法。实验发现随着外加电压周期的增大,表面电荷衰减愈加明显,放电谱图中放电相位的分布范围会随之发生变化。当电压周期延长到1 s后,电压极性翻转后介质表面无残留电荷,电压过零点附近无反向放电发生,表明残余电荷对外加电场的影响可忽略不计,电压极性反转后的首次放电完全取决于外加电压。最后计算发现,放电时延随着电压周期的增大而增大,且随电压幅值的增大而减小。
[Abstract]:In order to study the variation of PD / PD characteristics with voltage cycle, a combined surface charge / partial discharge (PD) measurement system was built. The dynamic distribution of surface charge and the corresponding partial discharge parameters in different voltage periods are measured. Then an approximate method for calculating the discharge delay is proposed. It is found that the time delay increases with the increase of the applied voltage period. When the voltage period is extended to 1 s, there is no residual charge on the dielectric surface after the voltage polarity turns over, and no reverse discharge occurs near the 00:00 voltage. The results show that the effect of residual charge on the applied electric field is negligible, and the first discharge after voltage polarity inversion is completely dependent on the applied voltage. Finally, it is found that the discharge delay increases with the increase of the voltage period. And it decreases with the increase of voltage amplitude.
【作者单位】：南方电网科学研究院有限责任公司;武汉大学电气工程学院;西安交通大学电力设备电气绝缘国家重点实验室;江苏宝杰隆电磁线有限公司;
【基金】：国家自然科学基金(51607128)~~
【分类号】：TM855

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