Research on partial discharge of oil-paper insulation needle-plate electrode under switching pulse voltage

被引：0
作者：
Nie, Dexin [1 ]
Wang, Mingyuan [2 ]
Zhou, Yuanxiang [2 ]
Wu, Zhirong [1 ]
Deng, Jiangang [1 ]
Zhang, Yunxiao [2 ]
机构：
[1] State Grid Electric Power Research Institute, Wuhan
[2] State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2015年 / 41卷 / 03期
关键词：
Needle-plate defect; Oil-paper insulation; Partial discharge; Switching pulse voltage; Time-domain waveform; Transformer;
D O I：
10.13336/j.1003-6520.hve.2015.03.029
中图分类号：
学科分类号：
摘要：
The characteristics of partial discharge in oil-paper insulation under switching pulse is of significance to the over voltage protection of oil-immersed transformers, thus we make use of the oil-paper insulation needle-plate defect to simulate the corona discharge in transformer oil, so as to study the discharge characteristics. The characteristics of discharge within the defect under switching pulse voltage (wavefront time 250±20% μs, half peak time 2 500±60% μs) are studied through experiment and simulation. Several conclusions are summarized as follows. Firstly, with the increasing of switching pulse voltage, the variation of partial discharge waveform of the experimental model concentrates on the main impulse during the rise time of the switching pulse, which enhances significantly, while the impulse during the fall time slightly changes. Secondly, with the increasing of switching pulse voltage, the first discharge occurs ahead of time and the corresponding level of switching pulse voltage is higher. Thirdly, the max discharge capacity, mean discharge capacity, impulse numbers, and repetition rate all increase with the increasing of switching pulse voltage. The derived results are helpful to the over-voltage protection and fault diagnosis of transformers, which has practical engineering values. ©, 2015, Gaodianya Jishu/High Voltage Engineering. All right reserved.
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页码：918 / 924
页数：6
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