Partial discharge characteristics of point-plane model in oil-paper insulation under AC voltage

被引：0
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作者：
机构：
[1] State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University
[2] Guangzhou Liwan Power Supply Bureau
来源：
Liao, R. (rjliao@cqu.edu.cn) | 1600年 / Science Press卷 / 40期
关键词：
Oil-paper insulation; Partial discharge; Power transformer; PRPD spectrum; Pulse current method; Thermal aging;
D O I：
10.13336/j.1003-6520.hve.2014.03.002
中图分类号：
学科分类号：
摘要：
In order to explore the process of partial discharge (PD) in point-plane model and the influence of aging on PD, we obtained oil-paper insulation samples of different aging stages, which were denoted by the degree of polymerization of insulation paper, through artificial aging processing under 130°C in laboratory. Then, by the pulse current method, we measured PD signals of point-plane model in oil-paper insulation under AC voltage. After analyzing the evolution of phase-resolved partial discharge (PRPD) H(q, φ) spectrum from the inception stage to pre-breakdown stage of PD, we discussed the influence of aging on H(q, φ) spectrum, maximal apparent charge, average apparent charge, PD number, and statistical parameters. The results show that PDs concentrate around positive and negative peaks in H(q, φ) spectrum, while PDs of applied voltage's positive half-cycles are greater than those of negative half-cycles in both amplitude and amount. Meanwhile, the H(q, φ) spectrum of positive half-cycles turns into an inverted 'V-shape' gradually with increasing voltage. In addition, in positive half-cycles, parameter skewness Sk+ of average discharge magnitude-phase distribution Hqave(φ) shows a downward trend with the increase of voltage, and Sk+ shifts to negative when the samples get to pre-breakdown stage, so Sk+ can be used to assess the defect development in oil-paper insulation of point-plane model. With the development of oil-paper insulation aging, the field strength is further distorted due to the increase of aging products, which leads to the rising of maximal apparent charge and average apparent charge, as well as the number of PD pulse in positive half-cycles.
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页码：648 / 654
页数：6
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