变压器油纸绝缘热老化过程中铜类产物生成规律及其危害

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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.

Key words： Transformer oil-paper insulation copper products XPS AFM surface roughness

Received: 07 June 2010 Published: 20 March 2014

PACS:

TM835

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	Liao Ruijin
	Hao Jian
	Yang Lijun
	Yin Jianguo
	Zhu Mengzhao

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Liao Ruijin,Hao Jian,Yang Lijun等. Formation Laws of Copper Products and Their Harms During Transformer Oil-Paper Insulation Thermal Aging Process[J]. Transactions of China Electrotechnical Society, 2012, 27(10): 52-59.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I10/52

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