Flashover Characteristics of Stage Insulators in the Multi-gap Gas Switch Under Repetitive Microsecond Pulses

被引：0
|
作者：
Lin T. [1 ]
Li Z. [2 ]
Li W. [2 ]
Wang Y. [2 ]
Wang N. [2 ]
Yang L. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
[2] Xi'an Power Supply Company, Xi'an
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 12期
关键词：
flashover path; repetitive microsecond pulses; stage insulator; surface flashover; surface insulation lifetime;
D O I：
10.13336/j.1003-6520.hve.20210625
中图分类号：
学科分类号：
摘要：
Multi-gap gas switch (MGS) is the key component of high-power microwave (HPM) system and the surface insulation strength of stage insulators makes contributions to the performance and long-life of the switch. In this paper, in order to accurately simulate the conditions of stage insulators within the MGS, investigations of flashover voltage, time delay and surface insulation lifetime (SIL) under repetitive microsecond pulses (RMPs) were carried out on cylindrical insulator samples under parallel plate-plate electrodes. Our results show that permittivity mismatch between insulators and gas leads to significantly electric field distortion, so that flashover voltage decreases with permittivity increasing, and the difference of flashover voltage in SF6 is less than in air; because of cumulation effect, flashover voltage and time delay all decrease with pulse repetition rate frequency (PRF) increasing; at the same applied voltage ratio, SIL increases when the gas pressure increases, SIL in SF6 is an order of magnitude higher than that in air, the material with higher permittivity expect to longer SIL; the difference of flashover paths between SF6 and air leads to the difference of flashover characteristics: the dispersion of flashover in SF6 is less than that in air, photoemission from the surface plays a significant role under RMPs, surface insulation failure occurs suddenly during the process of successive flashovers. The investigation provides a basis for surface insulation design and insulation material selection of stage insulators. © 2022 Science Press. All rights reserved.
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页码：4780 / 4790
页数：10
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