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| Study on Influence and Mechanismof Oil Sulfur Corrosion in Oil-Paper Insulation of Transformer Winding under the Electric Field |
| Yang Lijun1, Zhang Jiang1, Lu Yuncai2, Wei Chao2, Gao Sihang1 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. Electric Power Research InstituteState Grid Jiangsu Electric Power CompanyNanjing 211102 China |
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Abstract In order to study the effect of corrosive sulfur in transformer oil on the performance of Oil-paper Insulation under electric field, a typical kind of corrosive sulfur-dibenzyl disulfide (DBDS) was added into the transformer insulating oil with Pig-tail winding modelunder laboratory conditions, carried out oil sulfur corrosion test under AC and DC electric field with thermal aging at 130℃for 20 days.The physicochemical properties and electrical properties of the insulating oil aged after electro-thermal impact were tested and the sulfur corrosion mechanism under the effect of electric field was studied and obtained. The results showed that the addition of AC and DC electric field could accelerate the corrosion process, and the greater the electric field intensity was, the more obvious the effect occurred. Under the AC electric field, the corrosion degree of two electrodes was similar, but under the DC electric field, the corrosion degree of two electrodes was asymmetric, which is related to the polarity of the DC high voltage power supply. It is analyzed that the copper strips of the two electrodes formed an electrolytic cell and the electrochemical corrosion occurred, copper ion released from the surface of the electrode was the main reason to accelerate the sulfur corrosion process in oil.
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Received: 08 February 2017
Published: 12 April 2018
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2018, Vol. 33 
