Open-circuit corrosion as the origin of the electrical instability arising from the dissolved metal content in insulating oils in EHV current transformers |
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| Affiliation: | 1. Engineering Research Center of High-frequency Soft Magnetic Materials and Ceramic Powder Materials of Anhui Province, Engineering Technology Research Center of Preparation and Application of Industrial Ceramics of Anhui Province, School of Chemistry and Material Engineering, Chaohu University, 1 Bantang Road, Hefei, 238000, PR China;2. Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu''an, Anhui, 237012, PR China;3. Key Laboratory for Advanced Materials, Center for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, PR China;1. School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China;2. Ziyang Power Supply, National Sichuan Power Electric Corporation, 641300, China |
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| Abstract: | It is proposed that the source of dissolved copper in the oil within a transformer is the open-circuit corrosion of the copper parts in contact with the oil; the magnitude of this corrosion is proportional to the concentration of dissolved oxygen gas in the oil, based on data for six transformer units. |
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