Space Charge Characteristics of Epoxy Resin Under Power Frequency Square Wave Field

被引：0
|
作者：
Zhang Y. [1 ]
Su H. [2 ]
He M. [1 ]
Wu J. [3 ]
Yin Y. [3 ]
Liang Z. [1 ]
机构：
[1] Dongfang Electric Machinery Co., Ltd., Sichuan Province, Deyang
[2] Sichuan Research Institute, Shanghai Jiao Tong University, Sichuan Province, Chengdu
[3] Shanghai Key Laboratory of Power Transmission and Power Conversion Control of Ministry of Education, Shanghai Jiao Tong University, Minhang District, Shanghai
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 13期
基金：
中国国家自然科学基金;
关键词：
bipolar square wave; distortion rate of electric field; epoxy resin; space charge;
D O I：
10.13334/j.0258-8013.pcsee.220033
中图分类号：
学科分类号：
摘要：
In this paper, the space charge accumulation of epoxy resin is analyzed based on the space charge detection under a bipolar square wave electric field. A rising edge and frequency of square wave is 200μs and 50Hz, respectively. The polarization field is in the range of 0.83 to 16.63kV/mm. Combined with the detection of crosslinking by-products of infrared spectrum, the space charge accumulation of epoxy resin is analyzed, and the influence of electric field amplitude on space charge accumulation and maximum electric field distortion rate is discussed. The results show that the space charge of epoxy near surface is dominated by heteropolar charge. It decreases obviously after 48h vacuum degassing, which is consistent with the decrease trend of the number of functional groups related to impurities such as cross-linked byproducts. It means that the cross-linked by-products is the main sources of space charge. After ions migrate to the opposite polarity electrode driven by the electric field force, heteropolar charge accumulation is obviously formed near the surface of samples. The absolute value density рa, positive charge density р+ and negative charge density р- in the whole period average phase bulk charge density all increase with the external field E with exponential n͌1, which is close to the characteristic exponent n=1 of ohmic conduction. It indicates that the detection field may be in the ohmic conduction region, and the impurity ion charge is dominant as the carrier source. In the negative half period, рa, р+ and р- all show ohmic n͌1, while they show an exponential increase of n between conduction and transport characteristics with an exponential 1.130 and 1.159 in the positive half period. рs of full period, р+ of negative half period and р- of positive half period show obvious three-stage trial growth; there are two obvious threshold electric fields, and the maximum electric field distortion rate δmax is about 9%~17%. This may be mainly related to the dynamic balance of impurity ion charge and electrode charge quantity and distribution area of the samples at the bottom electrode side in positive and negative half-period field. ©2023 Chin.Soc.for Elec.Eng.
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页码：5294 / 5301
页数：7
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