固体绝缘材料热老化电气特性的研究

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Abstract The dielectric constants and the high temperature resistant performance of solid insulation used in oil-immersed transformer would limit the capacity and size of an oil-immersed transformer. In this paper, 3 polymers(polyester film, polycarbonate and phenylene sulfide) are aged under 130℃ up to 1 200 hours. The dielectric spectroscopy(here refers to the change tendency of relative permittivity and tanδalong with the change of temperature) and the AC electric breakdown strength of 3 polymers are investigated at different aging stages. According to the test results, the dielectric constants of three polymers is always less than the dielectric constant of insulating paper/board and more close to that of transformer oil, and their tanδare also less than that of insulating paper/board. Before aging test, the dielectric constants and tanδof polyester film and phenylene sulfide would be increased obviously at about 90℃, but not the polycarbonate. There shows the same change tendency of the dielectric constants and tanδfor 3 polymers at different aging stages as without aging test. It is also found that the AC breakdown voltage of 3 polymers at different aging stages have almost kept the same as the value of non-aged state. Considering the dielectric properties of these 3 polymers, comparing the properties of insulating paper/board, in terms of the lower dielectric constant and the higher ac breakdown voltage, polycarbonate may be used as one of suitable replacement materials for insulating paper/board used in oil-immersed transformer.

Key words： Oil-immersed transformer polymers thermal aging relative permittivity dissipation factor electric breakdown strength

Received: 02 March 2011 Published: 27 November 2013

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TM85

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	Articles by authors
	Tu Youping
	Sun Weizhong
	Yue Caipeng
	Wang Wei
	Chen Guanghui

Cite this article:

Tu Youping,Sun Weizhong,Yue Caipeng等. Research on Thermal Aging Electrical Properties of Polymer Materials[J]. Transactions of China Electrotechnical Society, 2013, 28(1): 7-13.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I1/7

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