Research on Thermal Aging Electrical Properties of Polymer Materials
Tu Youping1, Sun Weizhong2, Yue Caipeng3, Wang Wei1, Chen Guanghui1
1. Beijing Key Laboratory of High Voltage & EMC North China Electric Power University Beijing 102206 China; 2. Yunan Electric Power Research Institute Kunming 650217 China;
3. Shandong Liaocheng Power Supply Company Liaocheng 252000 China
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.
屠幼萍, 孙伟忠, 岳彩鹏, 王伟, 陈广辉. 固体绝缘材料热老化电气特性的研究[J]. 电工技术学报, 2013, 28(1): 7-13.
Tu Youping, Sun Weizhong, Yue Caipeng, Wang Wei, Chen Guanghui. Research on Thermal Aging Electrical Properties of Polymer Materials. Transactions of China Electrotechnical Society, 2013, 28(1): 7-13.
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2013, Vol. 28 
