Effect of Hydraulic Pressure on Breakdown Characteristics of Oil-paper Insulation and Damage Degree of Pressboard

被引：0
|
作者：
Zhou P. [1 ]
Wu G. [1 ]
Gao B. [1 ]
Hu G. [1 ]
Liu C. [1 ]
Yang Y. [1 ]
机构：
[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu
来源：
Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 12期
基金：
国家重点研发计划;
关键词：
AC; Breakdown characteristics; Degree of polymerization; Hydraulic pressure; Micro-structure; Oil-paper insulation;
D O I：
10.13336/j.1003-6520.hve.20191297
中图分类号：
学科分类号：
摘要：
The hydraulic pressure of oil-immersed transformer cylinder pressboard at different heights is obviously different, and the degree of deterioration of transformer oil-paper insulation by partial discharge under different hydraulic pressures is different. In order to study the effect of partial discharge on oil-immersed pressboard damage under different hydraulic pressures, a typical AC needle-plate partial discharge model was established in our labor-atory. Based on the pulse current method, the discharge characteristic parameters of partial discharge model were measured in real time, and the micro-phenomena on pressboard surface were observed by scanning electron microscopy(SEM). The breakdown and partial discharge characteristics of oil-paper interface under different hydraulic pressures were analyzed, and the changing trend of the damage degree of pressboard surface was also analyzed. The results show that hydraulic pressure is approximately proportional to breakdown voltage when hydraulic pressure is less than 0.5 MPa, and is non-linear when hydraulic pressure is more than 0.5 MPa. The higher the hydraulic pressure at the same voltage, the greater the degree of polymerization(DP) of pressboard after test is. By observing and analyzing the microstructure of the insulated pressboard, it is found that the damage degree of pressboard surface is reduced, which indicates that the hydraulic pressure has a 'protective' effect on the pressboard. Finally, the mechanism of hydraulic pressure to reduce partial discharge damage of oil-immersed pressboard was analyzed by using discharge characteristic parameters and experimental phenomena. The research results are helpful to understanding the influence of hydraulic pressure on the insulation performance of oil-immersed pressboard and can provide references for the insulation design of transformer. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：4155 / 4162
页数：7
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