C_(3)F_7CN/环氧树脂界面放电后固体绝缘的劣化特性  

Degradation Characteristics of Solid Insulation After Discharge at C_(3)F_7CN/Epoxy Resin Interface

作　　者：张颖[1] 王璁[1] 曹人杰 艾昕 屠幼萍[1] ZHANG Ying;WANG Cong;CAO Renjie;AI Xin;TU Youping(Beijing Key Laboratory of High Voltage&EMC,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学高电压和电磁兼容北京市重点实验室,北京102206

出　　处：《高压电器》2021年第3期33-40,共8页High Voltage Apparatus

基　　金：北京市自然科学基金(3192038)。

摘　　要：C_(3)F_(7)CN/CO_(2)是当前最具潜力的SF_(6)替代气体之一,而目前对C_(3)F_(7)CN/环氧树脂(EP)界面放电后固体绝缘劣化特性的研究则较少,不利于评估环保气体绝缘设备的绝缘状态。故文中模拟界面放电研究C_(3)F_(7)CN/CO_(2)中EP的绝缘劣化过程,测试了其表面形貌、粗糙度、元素及化学键组成和冲击闪络电压,最后从气固介质相互作用方面分析了EP放电劣化机制。结果表明:EP的闪络电压随放电时长增加而呈现下降趋势,相比于新试样,50 h时仅下降约0.3%,300 h时达13.5%。,界面放电后EP表面微观形貌与SF_(6)中基本一致;EP表面C-C、C=C、C-O键同样易发生断裂,F·也易取代H·而引入大量C-F键。而EP表面CH_(3)·易被CN·取代而引入C≡N键;特征产物C_(12)F_(7)H_(17)O_(2)的生成标志着EP放电劣化程度较为严重。C_(3)F_(7)CN/CO_(2)is presently one of the most potential alternative gases to SF_(6),while the study on degrada-tion characteristics of solid insulation after discharge at C_(3)F_(7)CN/epoxy resin(EP)interface is fairly rare,which is notconducive to evaluating the insulation condition of environment-friendly gas insulation equipment.Therefore,in thispaper the degradation process of EP in C_(3)F_(7)CN/CO_(2)is studied by way of simulating the interface discharge.The sur-face morphology,roughness,composition of elements and chemical bonds and impulse flash-over voltage are mea-sured.Finally,the degradation mechanism of EP discharge is analyzed from the aspect of gas-solid interaction.It isshown by the result that the flash-over voltage of EP decreases with the increase of discharge time.Compared withthe new samples,the decrease is only about 0.3%at 50 h and up to 13.5%at 300 h.The surface morphology of EPafter interface discharge is basically the same of that in SF_(6).C-C,C=C and C-O bonds on EP surface are also easyto fracture and F·is easy to replace H·,introducing a large number of C-F bonds on the surface of EP.However,the CH_(3)·is easily replaced by C≡N on the surface of EP.The formation of product C_(12)F7H_(17)O_(2)indicates that the EPdischarge degradation is serious.

关 键 词：C_(3)F_7CN/CO_(2) 环氧树脂 界面放电 绝缘劣化 闪络电压 

分 类 号：TM213[一般工业技术—材料科学与工程]