首页|Phase field model for electric-thermal coupled discharge breakdown of polyimide nanocomposites under high frequency electrical stress
Phase field model for electric-thermal coupled discharge breakdown of polyimide nanocomposites under high frequency electrical stress
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In contrast to conventional transformers,power electronic transformers,as an integral component of new energy power system,are often subjected to high-frequency and transient electrical stresses,leading to heightened concerns regarding insulation failures.Meanwhile,the underlying mechanism behind discharge breakdown failure and nanofiller enhancement under high-frequency electrical stress remains unclear.An electric-thermal coupled discharge breakdown phase field model was constructed to study the evolution of the breakdown path in polyimide nanocomposite insulation subjected to high-frequency stress.The investigation focused on analyzing the effect of various factors,including frequency,temperature,and nanofiller shape,on the breakdown path of Polyimide(PI)composites.Additionally,it elucidated the enhancement mechanism of nano-modified composite insulation at the mesoscopic scale.The results indicated that with increasing frequency and temperature,the discharge breakdown path demonstrates accelerated development,accompanied by a gradual dominance of Joule heat energy.This enhancement is attributed to the dispersed electric field distribution and the hindering effect of the nanosheets.The research findings offer a theoretical foundation and methodological framework to inform the optimal design and performance management of new insulating materials utilized in high-frequency power equipment.
dielectric discharge breakdownhigh frequency power electronic transformerpolyimide nanocompositesphase field model
韩智云、李庆民、李俊科、王梦溪、任瀚文、邹亮
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State Key Lab of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,People's Republic of China
School of Electrical Engineering,Shandong University,Jinan 250061,People's Republic of China
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