Aging Lifetime Evaluation of Transformer Oil-paper Insulation Considering Oil Replacement

被引：0
|
作者：
Liu J. [1 ,2 ]
Lü J. [1 ,2 ]
Zhang M. [1 ,2 ]
Jia H. [1 ]
Nie H. [2 ]
Wei X. [1 ]
机构：
[1] Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin
[2] State Key Laboratory Breeding Base of Dielectrics Engineering, Harbin University of Science and Technology, Harbin
来源：
Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Activation energy; Life prediction; Oil replacement cycles; Oil-paper insulation; Second-order dynamic model; XY model;
D O I：
10.13336/j.1003-6520.hve.20190410039
中图分类号：
学科分类号：
摘要：
Insulating oil is an important part of transformer oil-paper insulation, and the insulating performance of it has a significant impact on the oil-paper insulation system. The insulation performance of a transformer is improved by periodically replacement oil to remove impurities from it. We investigated the influence of oil replacement cycle on the thermal aging lifetime of a transformer. The accelerated thermal aging test at 130℃ was carried out on the XY model of transformer oil-paper insulation with different oil replacement cycles, and the tests for the variable temperature dielectric spectroscopy, polymerization degrees, acid value were conducted before and after oil replacement on the 15th, 30th, 45th, and 60th days. The relationship between the activation energy of insulating oil and the activation energy of insulating paperboard in the frequency range of 0.01~100 Hz for variable temperature dielectric loss curve after oil replacement was analyzed in detail. A method for calculating the activation energy of insulating paperboard based on middle frequency range of dielectric spectroscopy after oil replacement was proposed, and the aging translation factor was constructed by the above calculation method. Then, combined with the aging translation factor and the second-order kinetic model, the life prediction expressions of the oil-paper insulation system under different oil replacement cycles and temperatures were established. The results show that, with the shortening of the oil change cycle, the oil-paper insulation life gradually increases. The life prediction results of the oil-paper insulation are consistent with the actual situation, which proves the effectiveness of the method. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
引用
收藏
页码：1750 / 1758
页数：8
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