Mechanism of DBDS and Irgamet 39 on the Corrosion and Suppression of Copper in Transformers

Abstract:

Copper testing strips are wrapped with three layers of Kraft paper and carried out aging experiment in corrosive sulfur contaminated insulating oil at 150 °C for 10 days. It is found that the copper sulfide is first formed on the surface of copper and tainted to the inner side of the insulation paper. Then the copper sulfide permeates through the paper and damages the dielectric property. In addition, flaking mechanism on the transformer failure is proposed. On the basis of this observation, different concentration of Irgamet 39 used as passivator is treated with the transformer oil containing corrosive sulfur, investigating the acidity, dielectric loss and corrosion to seek optimized condition. At last, long term stability of Irgamet 39 is studied by means of 208 transformers in service.

• Periodical: Applied Mechanics and Materials (Volumes 713-715)
• Pages: 2754-2758
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.713-715.2754
• Online since: January 2015
• Authors: Yao Hong Zhao, Yi Hua Qian
• Keywords: Bridge Mechanism, Corrosive Sulfur, Flaking Mechanism, Irgamet 39, SEM-EDS, Transformer Oil

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