脉冲电压下聚酰亚胺空间电荷行为及其机理研究

doi:10.11930/j.issn.1004-9649.202209119

中国电力 ›› 2022, Vol. 55 ›› Issue (12): 112-123.DOI: 10.11930/j.issn.1004-9649.202209119

脉冲电压下聚酰亚胺空间电荷行为及其机理研究

侯健健¹, 王婵娟¹, 郭昊鑫², 陈晨¹, 刘学民³, 何东欣²

1. 国网山东省电力公司广饶县供电公司，山东东营 257300;
2. 山东大学电气工程学院山东省特高压输变电技术与装备重点实验室，山东济南 250061;
3. 国网山东省电力公司东营供电公司，山东东营 257000

收稿日期:2022-09-30 修回日期:2022-11-07 发布日期:2022-12-28
作者简介:侯健健（1985—），男，高级工程师，从事输配电设备运检技术及故障诊断的研究，E-mail：houjian1544@163.com;何东欣（1990—），男，通信作者，博士，副教授，从事固体绝缘空间电荷特性、电气设备在线监测与故障诊断方面的研究，E-mail：hdx@sdu.edu.cn
基金资助:
国家自然科学基金资助项目（51907105）。

Space Charge Behavior and Mechanism of Polyimide Under Pulse Voltage

HOU Jianjian¹, WANG Chanjuan¹, GUO Haoxin², CHEN Chen¹, LIU Xuemin³, HE Dongxin²

1. State Grid Shandong Guangrao Power Supply Company, Dongying 257300, China;
2. Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment, School of Electrical Engineering, Shandong University, Jinan 250061, China;
3. State Grid Shandong Dongying Power Supply Company, Dongying 257000, China

Received:2022-09-30 Revised:2022-11-07 Published:2022-12-28
Supported by:
This work is supported by the National Natural Science Foundation of China (No.51907105).

摘要/Abstract

摘要： 电力电子装备长期处于高重复频率、陡上升时间脉冲电压运行工况，绝缘更容易发生劣化和早期失效。为探究脉冲电压下绝缘失效的微观机理，对ns级别下的脉冲边沿前后空间电荷分布情况进行研究对比，探究了电场强度、硅油对脉冲边沿时刻电荷振动波形的影响。通过分析不同脉冲上升时间下的电荷振动波形及电压波形频谱、电荷积聚特性，阐明了脉冲电压边沿时刻电荷振动机理以及ns脉冲下电荷行为对绝缘劣化影响机理。研究发现，ns脉冲上升沿和下降沿前后电荷分布特性存在差异，在脉冲边沿处发现了特殊的空间电荷迁移行为；电场强度会影响异极性电荷的积累速度及积累量，从而影响电荷振动波形的形状；电极与试样之间涂敷硅油会影响电荷振动波形的极性；5×10⁶~1×10⁷ Hz频段的电压分量对空间电荷振动起主要作用；ns脉冲电压下电荷积聚导致电场畸变更加严重。

关键词: 脉冲电压, 聚酰亚胺, 电场强度, 硅油, 电荷振动波形, 电荷积聚

Abstract: The insulation of power electronic equipment is more likely to deteriorate and fail early because it is operated with high repetition rate and steep rise time pulse voltage for a long time. In order to explore the microscopic mechanism of insulation failure under pulse voltage, the space charge distribution before and after the pulse edge at the nanosecond level was studied and compared, and the influences of electric field strength and silicone oil on the charge vibration waveform at the pulse edge were explored. Based on an analysis of the spectrum of charge vibration waveform and voltage waveform and the charge accumulation characteristics at different pulse rise times, the charge vibration mechanism at the time of pulse voltage edge and the influence mechanism of charge behavior on insulation degradation under nanosecond pulse were expounded. It was found that the charge distribution characteristics before and after the rising edge and falling edge of the nanosecond pulse were different, and a special space charge migration behavior was found at the pulse edge; the electric field strength would affect the accumulation speed and amount of the heteropolar charge, thereby affecting the shape of charge vibration waveform; the application of silicone oil between the electrode and the sample would affect the polarity of the charge vibration waveform; the voltage component in the 5×10⁶~1×10⁷ Hz frequency band played a major role in the space charge vibration; the charge accumulation under the nanosecond pulse voltage caused serious electric field distortion.

Key words: pulse voltage, polyimide, electric field strength, silicone oil, charge vibration waveform, charge accumulation

侯健健, 王婵娟, 郭昊鑫, 陈晨, 刘学民, 何东欣. 脉冲电压下聚酰亚胺空间电荷行为及其机理研究[J]. 中国电力, 2022, 55(12): 112-123.

HOU Jianjian, WANG Chanjuan, GUO Haoxin, CHEN Chen, LIU Xuemin, HE Dongxin. Space Charge Behavior and Mechanism of Polyimide Under Pulse Voltage[J]. Electric Power, 2022, 55(12): 112-123.

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脉冲电压下聚酰亚胺空间电荷行为及其机理研究

Space Charge Behavior and Mechanism of Polyimide Under Pulse Voltage

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