Study on surface discharge of nonlinear conductive epoxy resin/SrTiO3 composites in 80–300 K temperature zone  

作　　者：Yunqi Xing Bin Wang Mingyang Wang Jiakai Chi Peng Jia Rongjin Huang 

机构地区：[1]State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin,China [2]Key Laboratory of Electormagnetic Field and Electrical Apparatus Reliability of Hebei Province,Hebei University of Technology,Tianjin,China [3]Key Laboratory of Special Machine and High Voltage Apparatus(Ministry of Education),Shenyang University of Technology,Shenyang,China [4]State Grid Tianjin High Voltage Company,Tianjin,China [5]China Energy Engineering Group Tianjin Electric Power Design Institute Co.,Ltd.,Tianjin,China [6]CAS Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Beijing,China

出　　处：《High Voltage》2024年第1期117-126,共10页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:51907047,52277143;S&T Program of Hebei,Grant/Award Number:21567605H;Key Laboratory of Special Machine and High Voltage Apparatus,Grant/Award Number:KFKT202207。

摘　　要：Bisphenol F epoxy resin(EP)is often used in terminal current lead insulation of superconducting equipment because of its good insulation performance,high mechanical strength,good toughness at cryogenic temperatures,and resistance to cold shock and heat shock.However,due to the wide temperature range of 80–300 K and the strong electric field,the EP-N_(2)interface is prone to surface flashover,resulting in terminal insulation failure.To improve the reliability of the current lead insulation,non-linear conductive EP/strontium titanate(SrTiO_(3))composites were prepared by modification with nano filling.The changes of dielectric,surface discharge,flashover,and trap distribution characteristics of composite materials were studied,and the mechanism of SrTiO_(3)on the surface flashover of composite materials was analysed.The results show that the conductivity of the composite increases with the rise of SrTiO_(3)filling content,and the amplitude of improvement is greater under the strong electric field,showing a more significant non-linearity.The composite has a lower trap energy level and a greater number of shallow traps compared to pure EP,which accelerates surface charge detrapping and reduces charge accumulation,effectively enhancing the discharge and surface flashover voltage of the composite.

关 键 词：COMPOSITES COMPOSITE INSULATION 

分 类 号：TB33[一般工业技术—材料科学与工程]