Analysis of the Phenomena and Characteristics of Gas-Solid Insulation Surface Discharge under High Frequency Sinusoidal Electrical Stress

被引：0
|
作者：
Zhang K. [1 ]
Zhang L. [1 ]
Li Z. [2 ]
Zhao T. [1 ]
Zou L. [1 ]
机构：
[1] School of Electrical Engineering, Shandong University, Ji'nan
[2] Sconomic&Technology Research Institute, State Grid Shandong Electric Power Company, Ji'nan
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2019年 / 34卷 / 15期
关键词：
Discharge spectrum; High frequency power transformer; High frequency sinusoidal electrical stress; Surface discharge; Surface topography;
D O I：
10.19595/j.cnki.1000-6753.tces.L80636
中图分类号：
学科分类号：
摘要：
Surface discharge in gas-solid insulation is a common defect in high frequency transformer. In order to study the phenomenon and characteristics of gas-solid insulation surface discharge under high frequency sinusoidal electrical stress, a needle-plateelectrode high frequency surface discharge experimental platform was established. The experiment was carried out by the constant sinusoidal voltage value, and the discharge development morphology, discharge characteristic parameters, discharge spectrum and surface damage of different stages were obtained. The results show that the surface discharge shows a strong polarity effect, the discharge times and discharge amplitude of positive half cycle are both greater than the negative half cycle. The development of polyimide surface discharge under high frequency electrical stress passes through corona discharge-streamer discharge-flashover, no spark discharge phenomenon, and the damage of the film by surface flashover is much greater than the power frequency electrical stress. With the formation of protrusion and "crystalline solids" on the insulating surface, the electric field structure is distorted to affect the discharge development. As a result, the discharge amplitude, times and phase distribution present specific changes in different stages of discharge. © 2019, Electrical Technology Press Co. Ltd. All right reserved.
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页码：3275 / 3284
页数：9
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