摘要
为研究复合绝缘子高压端内部芯棒护套间气隙水气浸入和护套淋雨受潮对复合绝缘子高压端气隙电场分布特性的影响,应用有限元分析软件COMSOL建立了交流110 kV复合绝缘子气隙三维模型,分别计算了水气浸入,护套受潮,水气浸入与护套受潮共同作用,对气隙处电场分布的影响。结果表明:水气浸入时,气隙处电场强度会降低10%～24%,但水气溶解气隙处杂质形成的电解液电晕场强较低,对比空气状态下,水气状态更加容易发生局部放电。护套受潮时,气隙处场强畸变增强,且随着受潮程度的增加,电场畸变愈发严重,重度受潮时场强可提高64%左右,且护套表面水分子极化作用会使得芯棒和护套材料老化,降低绝缘性能,对比干燥气隙绝缘子,护套受潮使得局部放电可能性加大。水气浸入和护套受潮共同影响时,由于两者的联合作用,将会极大降低绝缘子的绝缘性能,使得局部放电可能性加大,材料老化加重,最终引发护套击穿和芯棒断裂。
In order to study the influence of the moisture immersion and sheath damp on the gap electric field distribution of composite insulators in high-voltage side,a 110 kV AC composite insulator gap 3 D model are established by the finite element analysis software COMSOL,and the influence of moisture immersion,sheath damp and moisture immersion with sheath damp on the electric field distribution are analyzed. The results show that the electric field intensity of the air gap is reduced by 10% ~ 24% when the water vapor is filled,but the corona field intensity of the electrolyte formed in the water and gas dissolution gap is low,and the water vapor state is more likely to occur in the air state Discharge. When it comes to sheath damp,the air gap field distortion will enhance with increasing moisture level,and the strength can be increased by about 64% under condition of severe wet,besides,the polarization of water in the surface of sheath will make the mandrel and sheath material aging,which will reduce the insulation performance. Therefore,the possibility of partial discharge in sheath damp is higher than that of dry. The combination of moisture immersion and sheath damp will greatly reduce the insulation performance of insulators,which not only increase the possibility of partial discharge,but also aggravate the material aging,and ultimately lead sheath breakdown and mandrel fracture.
作者
胡建林
李洋洋
杨威
钟睿
蒋兴良
杨洪椿
HU Jianlin;LI Yangyang;YANG Wei;ZHONG Rui;JIANG Xingliang;YANG Hongchun(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,School of Electrical Engineering,Chongqing University,Chongqing 400030,China;State Grid Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology,State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China)
出处
《电瓷避雷器》
CAS
北大核心
2019年第1期226-232,238,共8页
Insulators and Surge Arresters
基金
国家自然科学基金项目(编号:51321063
51607019)
国家电网公司科技项目(编号:52170216000D)
关键词
复合绝缘子
有限元分析
电场分布
气隙
水气浸入
护套受潮
composite insulator
finite element analysis
electric field distribution
air gap
moisture immersion
sheath damp
