干式变压器气道在雷电冲击作用下的电场分布及其优化  

Electric field distribution and optimization of dry type transformer airway under lightning impluse

作　　者：张俊杰 赵洪峰[1] 赵国峰[2] ZHANG Junjie;ZHAO Hongfeng;ZHAO Guofeng(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;TBEA Electric Co.,Ltd.Xinjiang Transformer Factory,Changji 831100,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830047 [2]特变电工股份有限公司新疆变压器厂,新疆昌吉831100

出　　处：《绝缘材料》2025年第1期116-122,共7页Insulating Materials

基　　金：新疆维吾尔自治区自然科学基金资助项目(2022D01C21)。

摘　　要：110kV环氧树脂干式变压器,由于高压侧气孔通道处电场强度较高,存在气孔通道闪络现象。本文利用有限元仿真软件对变压器的高压侧线圈进行建模仿真,并施加标准雷电波进行雷电冲击验证,依据仿真结果,进行闪络原因分析和气道处场强分布的优化研究。结果表明:通过向环氧树脂内部相应区域添加绝缘介质的方法,改善了电场分布,同时通过改变介质的相对介电常数和位置的措施,在变压器内部场强的制约下,使气道处的最大场强降低了8.75%,满足了干式变压器高压侧气道抑制闪络的场强要求。The 110 kV epoxy resin dry type transformer has the phenomenon of flashover in the airway on the high voltage side due to its high electric field intensity.The high voltage side coil of transformer was modeled and simulated by finite element simulation software in this paper,and the standard lightning impulse was applied to verify the lightning impulse.According to the simulation results,the causes of flashover were analyzed and the field strength distribution at the airway was optimized.The results show that the electric field distribution is improved by adding a specific medium to the corresponding area inside the epoxy resin.At the same time,by changing the relative dielectric constant and position of the medium,the maximum field strength at the airway is reduced by 8.75% under the restriction of field strength inside the transformer,which meets the field strength requirement of the high-voltage side airway of the dry-type transformer to inhibit flashover.

关 键 词：干式变压器 气孔通道 雷电冲击 电场分布 

分 类 号：TM855[电气工程—高电压与绝缘技术]