Effect of preloaded DC voltage on characteristics of partial discharge in oil-paper insulation

被引：0
|
作者：
Jin, Fubao [1 ]
Zhou, Yuanxiang [1 ]
Sha, Yanchao [2 ]
Huang, Meng [1 ]
Liu, Zehong [3 ]
Lu, Licheng [3 ]
机构：
[1] State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing
[2] North China Electric Power Research Institute, Beijing
[3] State Grid Corporation of China, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2015年 / 41卷 / 03期
关键词：
Extinction voltage; Inception voltage; Oil-paper insulation; Partial discharge; Preloaded DC voltage; Space discharge;
D O I：
10.13336/j.1003-6520.hve.2015.03.032
中图分类号：
学科分类号：
摘要：
To study the effect of preloaded DC voltage on characteristics of AC partial discharge in oil-paper insulation, we investigated the characteristics of partial discharge in oil-paper insulation under different DC voltage, preloaded voltage time, and AC voltage repetition times. Meanwhile, we investigated the characteristic of space charge distribution in oil-paper insulation under different preloaded voltage time and depolarization to explore the effect on the partial discharge inception voltage (PDIV) and extinction voltage (PDEV). The results show that PDIV and PDEV of oil-paper decrease with longer preloaded voltage time and higher preloaded DC. The PDIV and PDEV are lower than those in the absence of preloaded DC voltage. Further analyses reveal that the space charge at the interface of oil-paper insulation is a main reason for discharge voltage decreasing. The space charge distribution of oil-paper insulation under DC voltage reaches a balance condition after 30 min under different preloaded voltage time. The amount of residual charge is more with longer preloaded time. The space charge has an aging effect on the surface of oil-paper which is closed to the HV electrode under longer and higher preloaded DC voltage, and results in distorting the distribution of electric field in oil-paper insulation, further has an effect on the partial discharge characteristics of oil-paper insulation. ©, 2015, Gaodianya Jishu/High Voltage Engineering. All right reserved.
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页码：937 / 946
页数：9
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