短间隙放电中的电晕型先导特性

发布时间：2018-03-01 15:29

本文关键词： 短间隙电晕型先导放电电流波形特高频电磁波局部放电　出处：《中国电机工程学报》2017年11期 　论文类型：期刊论文

【摘要】：该文针对短间隙(15mm)气体预击穿过程中电晕型先导存在的可能性进行了进一步的研究。采用放电电流脉冲分析、电磁波检测、PRPD谱图和高速相机拍摄的方法对短间隙两种棒板放电结构(尖板和球板)进行了实验。研究表明:在尖板结构预击穿阶段,电流脉冲上升沿和电磁波脉冲发展初期存在分段现象,球板结构没有,计算表明这两段的速度是和先导速度以及先导头部的流注速度对应。曝光时间为200ns和200us的照片证实了尖板电极放电中的"茎"结构。上述结果说明,在短间隙尖板放电预击穿阶段中长刷状电晕转化为电晕型先导。电晕型先导和普通电晕放电的电磁波在PRPD谱图中存在明显不同,上升延时间对电流幅值和电流变化率的影响解释了电磁波幅值差异。这种放电阶段的划分以及PRPD谱图对先导的表征有助于对电晕局放严重程度的判断。
[Abstract]:In this paper, the possibility of the existence of corona lead during the prebreakdown of gas with short gap of 15mm is studied further. The discharge current pulse analysis is used. In this paper, the PRPD spectrum of electromagnetic wave detector and the method of high speed camera are used to test the discharge structure of two kinds of rod plates with short gap (tip plate and ball plate). The results show that the prebreakdown stage of the structure is in the stage of pre-breakdown. The rising edge of current pulse and the initial development of electromagnetic wave pulse have the phenomenon of segmenting, and the structure of ball plate is not. The calculations show that the velocity of the two segments corresponds to the velocity of the lead and the velocity of the flow of the head of the pilot. The photographs with exposure time of 200ns and 200us confirm the "stem" structure in the electrode discharge of the tip plate. The long brush corona is converted into a corona leader during the prebreakdown stage of the short gap tip plate discharge. The electromagnetic waves of the corona type lead and the ordinary corona discharge are obviously different in the PRPD spectrum. The effect of rising delay time on current amplitude and current change rate explains the difference of electromagnetic wave amplitude. The division of the discharge stages and the characterization of the leader by PRPD spectra are helpful to judge the severity of corona partial discharge.
【作者单位】：华中科技大学电气与电子工程学院;
【基金】：国家自然科学基金项目(51577081)~~
【分类号】：TM85

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