Effect of moisture content on dielectric frequency domain response of oil-paper condenser bushing

被引：0
|
作者：
Liao R. [1 ]
Du Y. [2 ]
Gao J. [2 ]
Luo D. [2 ]
Guo J. [2 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing
[2] State Grid Chengdu Power Supply Company, Chengdu
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 11期
关键词：
Capacitance ratio; Dielectric frequency domain response; Insulation oil; Main insulation; Moistened defect; Oil-paper condenser bushing;
D O I：
10.16081/j.epae.201910014
中图分类号：
学科分类号：
摘要：
A 10 kV OIP(OIl-Paper) bushing model is designed and made. The potential distribution of the 10 kV OIP bushing model is simulated, the simulative results show that the potential distribution of the 10 kV OIP bushing model is linearly along the radial path. The measured value of power frequency 50 Hz capacitance of the 10 kV OIP bushing model is 30.197 pF, which is close to the theoretical calculating value 30.172 pF, so the 10 kV OIP bushing model satisfies the actual requirements. The DFRs(Dielectric Frequency Responses) of main insulation and insulation oil of bushing with different moisture contents are studied. The results show:the dielectric loss and capacitance of the damp main insulation increase obviously in the whole frequency domain from 10-3 Hz to 103 Hz due to moistened defect; the dielectric loss of mois-tened insulation oil increases mostly in the whole frequency domain, while the capacitance only increases in the frequency domain from 10-3 Hz to 10-1 Hz, and remain basically unchanged from 10-1 Hz to 103 Hz. Finally, the ratios of capacitance value to power frequency capacitance value at characteristic frequency points(10-3 Hz, 10-2 Hz, 10-1 Hz) are selected to evaluate the moisture state of bushing insulation, which provides a theoretical reference for the application of DFR technology to the condition assessment of OIP bushing. © 2019, Electric Power Automation Equipment Press. All right reserved.
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页码：8 / 12
页数：4
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