摘要
日益提升的高压直流输电电压等级对直流电缆附件用硅橡胶的电气性能提出了更高的要求,为了探究具有优良直流电气性能的复合硅橡胶材料,文中制备了填充不同质量分数的聚多巴胺修饰氮化硼纳米片改性硅橡胶,对比分析了不同填充量下复合硅橡胶的直流电气性能。结果表明:填充氮化硼纳米片可以有效抑制硅橡胶的空间电荷积聚现象,试样的直流击穿场强随填充量的提高呈现先增大后减小的趋势,在填充量(质量分数,下同)为15%时达到最大值,相比纯硅橡胶提升23.2%,直流电导率先减小后增大,在填充量为15%时取得最小值;除此之外,当填充量为15%时,试样的拉伸强度较纯硅橡胶提升了38.3%,试样的断裂伸长率仅下降2.7%,基本保持了原有的断裂伸长率;经聚多巴胺修饰的氮化硼纳米片复合硅橡胶相比于未经表面修饰的氮化硼纳米片复合材料,其直流电气和力学性能都有显著提高。综合分析,填充量为15%时复合材料具有较好的综合性能。
The increasing voltage level of HVDC transmission requires the higher electrical performance of silicone rubber used in DC cable accessories.In order to explore the excellent DC electrical performance of the composite silicone rubber material,this paper prepared the modified silicone rubber filled with different mass fraction of polydopamine modified boron nitride nanosheets,and compared and analyzed the DC electrical performance of the composite silicone rubber under different filling quantities.The results show that the space charge accumulation of silicone rubber can be ef-fectively inhibited by the filling of boron nitride nanosheets.The DC breakdown field strength of the sample increases first and then decreases with the increase of the filling amount,and reaches the maximum value when the filling amount is 15%,which is 23.2%higher than that of pure silicone rubber.The DC conductivity decreases first and then increases,and reaches the minimum value when the filling amount is 15%.In addition,when the filling amount is 15%,the tensile strength of the sample is increased by 38.3%compared with that of pure silicone rubber,and the elongation at break of the sample is reduced only by 2.7%,basically maintaining the original elongation at break.The DC electrical and mechanical properties of boron nitride nanosheet composite silicone rubber modified with polydopamine are significantly improved compared with those without modification.The comprehensive analysis shows that the composite has better comprehen-sive properties when the filling amount is 15%.
作者
周远翔
闫晨宁
张云霄
朱小倩
ZHOU Yuanxiang;YAN Chenning;ZHANG Yunxiao;ZHU Xiaoqian(Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment,School of Electrical Engi-neering,Xinjiang University,Urumqi 830047,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第1期302-312,共11页
High Voltage Engineering
基金
国家自然科学基金(51907101
51977186)
国家电网公司科技项目(SGJBDK00SBJS2250000)。
关键词
硅橡胶
电缆附件
直流电气性能
氮化硼纳米片
力学性能
silicon rubber
cable accessories
DC electrical performance
boron nitride nanosheets
mechanical property
