Formation Pattern and Effect of Copper Sulfide in Transformer Oil

doi:10.11930/j.issn.1004-9649.2016.12.031.06

Abstract

Abstract: The corrosive sulfur in transformer oil may cause bad impacts on the transformer insulation. In order to study the influence of corrosive sulfur in transformer oil on the copper line and the oil immersed insulation paper, a series of thermal aging tests are carried out on Oil Samples 1 and 2 at 130 ℃ and 150 ℃ in laboratory. By analyzing the property changes of bared copper line, paper wrapped copper line, paper and oil, Sample 1 exhibits strong sulfur corrosiveness while Sample 2 does not. In addition, the corrosion on the copper line surface and the insulating paper inner surface deteriorates with the aging time. The Cu2S deposition on the insulating paper is related to not only the severity of corrosion, but also the aging time. Moreover, it may change the copper line surface structure and the insulation paper fiber distribution significantly, as well as the dielectric properties of oil immersed paper. With Cu2S deposition, the breakdown field of a strong composite medium will also decrease substantially. The study results on corresponding corrosion preventive measures will be elaborated separately.

Key words: transformer oil, corrosivity sulfur, copper sulfide, oil-paper insulation, thermal aging test

CLC Number:

TM411

HE Zhiman, WANG Jianfei. Formation Pattern and Effect of Copper Sulfide in Transformer Oil[J]. Electric Power, 2016, 49(12): 31-36.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.12.031.06

https://www.electricpower.com.cn/EN/Y2016/V49/I12/31

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