The Research on Electrical Aging Characteristics of Turn-to-Turn Insulation of Dry-Type Air Core Reactor under Partial Discharge
Nie Hongyan1, 2, Zhang Chaohai1, Gu Zheyi2, Yao Yuanhang2, Liu Xiaosheng1
1. Deptment of Electrical Engineering Harbin Institute of Technology Harbin 150001 China; 2. Key Laboratory of Engineering Dielectrics and Its Application Harbin University of Science and Technology Harbin 150080 China
Abstract：The electric aging rule was studied for turn-to-turn insulation of dry-type air core reactor, and partial discharge inception voltage tests and breakdown tests were performed for the model specimen of turn-to-turn insulation of dry-type air core reactor. The electrical aging life test was carried out by constant voltage method and step voltage method when partial discharges occurred in the turn-to-turn insulation of dry-type air core reactor, and the inverse power models of electrical aging life were obtained in two aging ways. The reasons for the difference of the two life equations were analyzed and verified by experiments. The inverse power life equation under constant voltage was corrected for the model of turn-to-turn insulation of dry-type air core reactor after partial discharges happened. From the results, that electric aging rule does not follow the inverse power life model when partial discharges take place in the turn-to-turn insulation of dry-type air core reactor, and the withstand voltage index N and the constant C increase with the increase of the test voltage; Partial discharge may occur under various over-voltages, which is very harmful to inter turn insulation material of dry-type air core reactor. By improving the manufacturing process to improve partial discharge inception voltage, the material with strong resistance to partial discharge used as turn insulation or installing over voltage suppression device to limit the amplitude of over voltage, these methods can prolong the service life of turn-to-turn insulation for dry-type air core reactors.
聂洪岩, 张潮海, 顾哲屹, 姚远航, 刘晓胜. 局部放电条件下干式空心电抗器匝间绝缘的电老化特性研究[J]. 电工技术学报, 2018, 33(13): 3071-3079.
Nie Hongyan, Zhang Chaohai, Gu Zheyi, Yao Yuanhang, Liu Xiaosheng. The Research on Electrical Aging Characteristics of Turn-to-Turn Insulation of Dry-Type Air Core Reactor under Partial Discharge. Transactions of China Electrotechnical Society, 2018, 33(13): 3071-3079.
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2018, Vol. 33 
