硅橡胶表面水珠的击穿电压与电场关系研究  

Research on the Relationship between Breakdown Voltage and Electric Field of Water Droplets on Slicon Rubber Surface

作　　者：方春华[1] 陶玉宁 田佳 智李[1] 黄立 丁璨 孙维 吴田 FANG Chunhua;TAO Yuning;TIAN Jia;ZHI Li;HUANG Li;DING Can;SUN Wei;WU Tian(College of Electrical Engineering&New Energy,China Three Gorges Univ.,Yichang,443002,China;Maoming Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Maoming 525000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]广东电网有限责任公司茂名供电局,广东茂名525000

出　　处：《三峡大学学报（自然科学版）》2021年第2期107-112,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金青年基金项目(51807110)。

摘　　要：复合绝缘子表面分离水珠会使电场畸变,导致击穿电压降低.本文基于ANSYS有限元软件建立硅橡胶表面分离水珠模型,用准静态谐分析法计算了直流电压作用下硅橡胶表面分离不同数量、半径和电导率水珠时的电场分布和击穿电压,并在人工环境里进行硅橡胶表面水珠放电试验.结果表明:水珠两端、空气和硅橡胶交界处电场畸变最为严重;水珠数量、半径和电导率越大时,硅橡胶表面电场分布越不均匀,最大场强越大;击穿电压随着水珠数量、半径和电导率的增大有不同程度的下降,下降率分别在6%~52%、3%~18%和24%~52%之间,其中水珠数量和电导率对击穿电压影响较大;硅橡胶表面击穿电压与最大场强呈负相关性.此研究成果可为进一步研究放电的产生和发展提供支持.The separation of water droplets on the surface of composite insulators will cause the distortion of electric field and the reduction of breakdown voltage.In this paper,the model of water droplets separated from the surface of silicone rubber is built based on the software ANSYS finite element.The distribution of electric field and breakdown voltage are calculated by using the method of quasi-static harmonic analysis while the number of water droplets,the radius and the conductivity are different under DC voltage.The results show that the distortion of electric field is the most serious at the junction of water droplets,air and silicone rubber.As the number,the radius and the conductivity of water droplets increase,the distribution of electric field on the surface of silicone rubber is more uneven and the maximum field strength is greater.The breakdown voltage decreases at the different degrees with the increase of the number,the radius and the conductivity of water droplets.The drop rate of breakdown voltage is at the range of 6%~52%,3%~18%and 24%~52%,respectively,and the number and conductivity of the beads affect the breakdown voltage greatly.The breakdown voltage of silicone rubber is negatively correlated with the maximum field strength.The research results provide the support for further research on the generation and development of discharge.

关 键 词：硅橡胶 分离水珠 电场畸变 击穿电压 最大场强 

分 类 号：TM852[电气工程—高电压与绝缘技术]