绝缘垫片缺陷对射频电缆电场分布影响的研究  

Study on effect of insulating gasket defects on electric field distribution of RF cables

作　　者：周歧斌 单威 边晓燕 谌云峰 吴勇 赵信翔 ZHOU Qibin;SHAN Wei;BIAN Xiaoyan;CHEN Yunfeng;WU Yong;ZHAO Xinxiang(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;Yichun Power Supply Branch,State Grid Jiangxi Electric Power Co.,Ltd.,Yichun 336000,China;Jiading Power Supply Company,State Grid Shanghai Electric Power Company,Shanghai 201800,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]上海大学机电工程与自动化学院,上海200444 [3]国网江西省电力有限公司宜春供电分公司,江西宜春336000 [4]国网上海市电力公司嘉定供电公司,上海201800

出　　处：《绝缘材料》2024年第9期88-96,共9页Insulating Materials

基　　金：上海市科技计划项目(21DZ203900)。

摘　　要：大功率空气绝缘射频同轴电缆在物联网等领域具有广阔的应用前景,研究其重要的绝缘部件——绝缘垫片在常见缺陷存在下的电场分布情况对射频同轴电缆安全稳定运行具有重要意义。首先,建立包含内外导体和绝缘垫片的射频同轴电缆数值模型并在有限元软件中搭建其静电场仿真模型,通过试验验证了该模型的准确性;其次,基于所搭建的模型调节缺陷的形态、位置参数研究内部气泡、表面异物和界面缺陷对绝缘垫片电场分布的影响,并与无缺陷时的电场强度仿真结果进行比较。结果表明:绝缘垫片电场分布与内部气泡形态有关,并且距离内导体越近,电场畸变越严重;表面异物的尺寸、位置、排列方式都会影响电场分布,其中导电颗粒对电场的影响比沙粒大;界面缺陷对电场的影响程度与缺陷厚度成负相关,与缺陷深度成正相关。综上,3种缺陷中导致电场畸变最严重的缺陷是表面异物,其次是界面缺陷。High-power air-insulated RF coaxial cable has a broad application prospect in the field of Internet of Things.It is of great significance to study the electric field distribution of its important insulating component—insulating gasket in the presence of common defects for the safe and stable operation of RF coaxial cables.Firstly,a numerical model of RF coaxial cable containing inner and outer conductors and insulating gaskets was established and a simulation model of electrostatic field was constructed in finite element software,and the accuracy of the model was verified through experiments.Secondly,on the basis of constructed model,the effects of internal air bubbles,surface foreign objects,and interface defects on the electric field distribution of insulating gaskets were studied by adjusting the morphology and positional parameters of defects,and compared with the simulation results of electric field intensity in the absence of defects.The results show that the electric field distribution of the insulating gasket is related to the morphology of internal bubbles,and the closer the distance from the inner conductor,the more serious the electric field distortion;the size,location,and arrangement of the surface foreign objects will affect the electric field distribution,and the influence of conductive particles on the electric field is larger than that of sand particles;the interface defects have a negative correlation with the thickness of defects,and have a positive correlation with the depth of defects.In summary,it is surface foreign object leading to the most serious electric field distortion in three kinds of defects,followed by interface defect.

关 键 词：射频同轴电缆 空气绝缘 绝缘垫片 内部气泡 表面异物 界面缺陷 

分 类 号：TM248.3[一般工业技术—材料科学与工程]