开关柜用环氧树脂绝缘表面的凝露放电特性研究  

Research on condensation discharge characteristics on surface of epoxy resin insulation for switchgears

作　　者：赵心毅 周文凯 李传扬 雷志鹏[1] 李媛媛[1] 赵良华 ZHAO Xinyi;ZHOU Wenkai;LI Chuanyang;LEI Zhipeng;Li Yuanyuan;ZHAO Lianghua(College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Inner Mongolia Power Marketing Service and Operation Management Branch,Hohhot 010010,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Jiangyin Furen Electrical Co.,Ltd.,Jiangyin 214434,China)

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024 [2]内蒙古电力营销服务与运营管理分公司,内蒙古呼和浩特010010 [3]清华大学电机工程与应用电子技术系,北京100084 [4]江阴市富仁电气有限公司,江苏江阴214434

出　　处：《绝缘材料》2024年第12期98-107,共10页Insulating Materials

基　　金：国家自然科学基金资助项目(51977137);山西省基础研究计划(202403021211079、202103021224115)。

摘　　要：风机塔底箱式变电站的开关柜内绝缘子表面常会凝露并引发局部放电,严重威胁设备运行安全。为进一步了解凝露后环氧树脂表面的电场分布和放电过程,本文以人工喷雾凝露的方式模拟自然凝露过程,仿真分析了电场不均匀系数变化时凝露对绝缘表面电场分布的影响,测量了不同凝露附着量下环氧树脂表面的局部放电谱图,并进一步讨论了绝缘表面放电的变化规律。结果表明:人工喷雾凝露可以较好地定量模拟自然凝露下绝缘表面的凝露附着量;不同位置的凝露均会引起局部电场畸变,导致放电路径上的表面电荷聚集和增加,提高了局部放电发生的可能性;表面电场不均匀系数越大,局部放电的起始电压越低,越容易引发局部放电;绝缘表面凝露附着量的增加对局部放电现象有促进的作用,凝露越多,表面电场畸变程度和水珠融合概率越大,起始放电电压就越低,表面放电次数和放电幅值越高。Partial discharge often occurs due to condensation on the surface of insulator inside the switchgear of box-type substation at the bottom of the wind turbine tower,which seriously threatens the operational safety of equipment.In order to further understand the electric field distribution and discharge process on the surface of epoxy resin with condensation,we used artificial spray condensation was to simulate the natural condensation process in this study.The influence of condensation on the electric field distribution of the insulation surface was simulated and analyzed when the electric field non-uniform coefficient was changing.The spectrogram of partial discharge on the epoxy resin surface under different condensation amount was measured,and the change law of the insulation surface discharge was further discussed.The results show that the artificial spray condensation can quantitatively simulate the condensation amount on the insulation surface under natural condensation.Condensation at different locations can cause the distortion of partial electric field,leading to the accumulation and increase of surface charges on the discharge path,which increases the possibility of partial discharge.When the non-uniformity coefficient of surface electric field is larger,the partial discharge initial voltage is lower,and partial discharge is easier to occur.The increase in the adhesion amount of condensation on the insulation surface promotes the partial discharge.With the increase of condensation amount,the degree of surface electric field distortion and the probability of water droplet fusion increase,while the initial discharge voltage decreases,the number and amplitude of surface discharge increase.

关 键 词：绝缘子 凝露 表面放电 凝露放电 箱式变电站 

分 类 号：TM215[一般工业技术—材料科学与工程]