1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China 2. Chongqing Electric Power Research Institute Chongqing 401123 China 3. Xiangtan Power Supply Burean Xiangtan 411100 China
Abstract：Transformer failure caused by the corrosion of copper material in transformer attracts great attention of domestic and foreign researchers and engineers. 25# naphthenic transformer oil, 25# paraffin-based transformer oil, kraft paper and copper are used to compose four combinations of oil-paper insulation samples. The thermal characteristic of four combinations of oil-paper insulation samples are compared, the existence form of deposition products on insulating paper surface is characterized by X-ray photoelectron spectroscopy (XPS), the content variations of copper products dissolved in insulating oil and deposited on paper surface are analyzed, and the effects of copper products on the paper surface roughness are studied by atomic force microscope (AFM). The results show that the content of copper products dissolved in insulating oil increases with aging time at first and then decrease. The copper products can accelerate the aging rate of insulating oil and reduce its breakdown voltage. Before the oil sludge appearing, the content of copper products dissolved in 25# naphthenic transformer oil is less than that in 25# paraffin-based transformer oil after aging the same time. The copper products can deposit on the insulating paper surface and the largest content of copper products depositing on the insulation paper surface is the paper which is the most recent away from the copper. XPS results show that there are copper and copper oxide depositing on the insulating paper surface. The copper products increase the insulating paper surface roughness.
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2012, Vol. 27 
