Abstract：In order to research the influence of corrosive sulfur in transformer oil on the copper wire and oil immersed insulation paper, a series of thermal aging tests was carried on one kinds of Nynas oil, which had been running for five year on field, in the laboratory. The surface’s color changing, microstructure and elements component of copper line and insulation paper were analyzed by naked eyes’ examination and via scanning electron microscope (SEM) together with energy-dispersive X-ray (EDX) analyzer; the dissipation factor and permittivity of oil immersed insulation paper while before and after aging were measured by broad frequency dielectric spectroscopy, and its breakdown strength was tested as well. The results show that: the color changing of copper surface represents its corrosive level. The oxygen concentration in oil has no significant effect on the reaction between dibenzyl disulfide (DBDS) and copper, but would affect the deposited condition of copper sulfide (Cu2S) on copper wire and insulation paper surface, when there are Cu2S deposited, the copper wire surface structure and insulation paper fiber structure would change a lot, moreover, the dielectric properties of oil immersed paper would decrease. All of the above results are the basic experiment foundation for a further study on the risk of corrosive sulfur in transformer oil and related mechanisms.
任双赞, 曹晓珑, 钟力生. 变压器油中腐蚀性硫对铜导线及油浸绝缘纸特性影响[J]. 电工技术学报, 2011, 26(10): 129-135.
Ren Shuangzan, Cao Xiaolong, Zhong Lisheng. Influence of Corrosive Sulfur in Transformer Oil on the Copper Wire and Oil Immersed Insulation Paper. Transactions of China Electrotechnical Society, 2011, 26(10): 129-135.
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