A comparative analysis of dielectric properties of oil-paper insulation and polymer materials before and after thermal aging

作     者：WANG Wei YUE CaiPeng HE DongXin YANG Kai CHEN ShengKe 

作者机构：Beijing Key Laboratory of High Voltage & Electromagnetic Compatibility State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Shandong Liaocheng Power Supply Company 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2014年第57卷第4期

页      面：738-746页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.50977025) 

主　　题：oil-immersed transformer solid insulation polymer materials thermal aging dielectric properties 

摘      要：The shortcomings of oil-immersed transformer solid insulation like low high-temperature resistance of the insulation paper and the uneven distribution of electric field caused by the large difference of dielectric constants between insulation paper and transformer oil,restricted the development of transformer with smaller size and larger *** view of this situation and the transformer’s demand for the dielectric physicochemical and mechanical property of insulation material,polycarbonate,polyester film and polyphenylene sulfide with high high-temperature resistance were chosen for the comparison analysis in this paper We did the 300-day thermal aging experiment on four samples in transformer oil under different aging temperatures of90°C,110°C and 130°C,then analyzed the changes of their dielectric *** experiment results are as follows;the permittivity and dielectric dissipation factor of the three polymer materials are apparently smaller than those of the paper both before and after 300-day aging;the volume resistivity and partial discharge inception voltage of the three materials are higher than those of the paper both before and after aging;and the breakdown field strength of polycarbonate is higher than that of the paper both before and after aging,while that of polyester film and polyphenylene sulfide are slightly lower than that of the paper.