10 kV管型绝缘母线典型缺陷下的电场畸变分析  

Analysis on electric field distortion of 10 kV tubular insulated busbar with typical defects

作　　者：孙丰睿 咸日常[1] 咸峰 孙晓维 邢雅雯 SUN Fengrui;XIAN Richang;XIAN Feng;SUN Xiaowei;XING Yawen(College of Electric and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;Shandong Qixing Electric Technology Development Co.,Ltd.,Zibo 255000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]山东七星电气科技发展有限公司,山东淄博255000

出　　处：《绝缘材料》2024年第9期140-148,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(52077221)。

摘　　要：变电站管型绝缘母线接头潮气侵入和残留导电微粒是其常见缺陷,缺陷导致接头电场分布发生畸变,危及其绝缘性能,甚至发生绝缘击穿、烧毁等事故。本文采用有限元多物理场仿真技术,基于实际结构构建了绕包式管型绝缘母线接头模型,分别在金属屏蔽层与主绝缘层界面、主绝缘层与内密封层界面设置长度分别为10、30、50 mm的3种不同水膜和半径为0.5 mm的半圆形导电杂质,利用COMSOL软件进行电场仿真分析,研究不同缺陷位于不同界面对管型绝缘母线接头电场分布的影响。结果表明:水膜和导电杂质都会对绝缘带材界面电场分布产生不同程度的影响,缺陷内部场强下降,缺陷边缘场强剧增,其中绝缘界面残留导电微粒时电场畸变情况比水分侵入时更加严重,更易发生绝缘击穿事故,应加强端部密封和严防导电微粒残留。Moisture intrusion and residual conductive particles are common defects in the joints of tubular insulated busbars in substations.These defects would cause distortion of electric field distribution at the joints,endangering insulation performance and potentially leading to insulation breakdown,burning,and other accidents.In this paper,finite element multi-physics simulation technology was used to construct a joint model of tubular busbar with wrapped insulation material based on the actual structure.Three types of water films,with 10,30,and 50 mm of lengths,and semi-circular conductive impurities with 0.5 mm of radius,were placed at the interfaces between the metal shielding layer and the main insulation layer,as well as between the main insulation layer and the inner sealing layer.COMSOL software was used to conduct electric field simulation analysis,and the impact of different defects located at various interfaces on the electric field distribution of tubular insulated busbar joint was studied.The results show that both water films and conductive impurities can impact the electric field distribution at the insulation layer interfaces to different degrees.The electric field strength inside the defects decreases,while the electric field strength at the defect edges increases dramatically.Among these,the electric field distortion with conductive particles at the insulation interface is more severe than that with moisture intrusion,making insulation breakdown faults more likely.Therefore,it is crucial to enhance the end sealing and strictly prevent the presence of residual conductive particles.

关 键 词：管型绝缘母线 接头 有限元仿真 典型缺陷 电场分布 

分 类 号：TM854[电气工程—高电压与绝缘技术]