摘要
环氧树脂在直流电场下易于积聚电荷造成局部电场畸变,进而诱发沿面闪络。文中建立了考虑离子产生、复合、迁移和扩散过程的电荷积聚模型,并在模型中计及了电导率的温度特性。研究了不同温度下气固界面电势、电场、电荷的分布及功率损耗变化,分析了温度对电荷行为和电场畸变率的影响。结果表明:表面电荷密度随温度升高而增大,三结合点处电荷密度最大;温度对切向电场的影响更大,随温度升高,电荷积聚的主要方式由表面传导向体传导转变;适当升温可以提高表面电荷积聚和消散速率,但高温会使表面电荷密度和泄漏电流增大,进而加剧畸变和损耗。该研究将有助于揭示气固界面与沿面闪络的内在联系,为抑制沿面闪络提供可能方案。
Epoxy resin tends to accumulate charge under DC electric field,causing partial electric field distortion and inducing surface flashover.In this paper,the charge accumulation model considering ion generation,recombination,migration and diffusion processes is set up,and the temperature characteristic of the conductivity is considered in the module.Moreover,the distribution of the potential,electric field and charge as well as power loss of the gas-solid interface at different temperatures are studied.The effect of temperature on the charge behavior and electric field distortion rate is analyzed.The results show that the surface charge density increases with the increase of temperature,and the charge density at the triple junction is maximum.The effect of temperature on the tangential electric field dominates.With the increase of temperature,the main mode of charge accumulation is changed from surface conduction to body conduction.Proper rise of temperature can increase the surface charge accumulation and dissipation rate,but high temperature can increase the surface charge density and leakage current,which in turn aggravates the distortion and loss.This study reveals the intrinsic connection between gas-solid interface and surface flashover,and provide possible solutions to suppress surface flashover.
作者
谢子豪
李敏
宋岩泽
吕天舒
曲展玉
谢军
XIE Zihao;LI Min;SONG Yanze;LYU Tianshu;QU Zhanyu;XIE Jun(Department of Electrical Engineering,North China Electric Power University,Hebei Baoding 071003,China;State Grid Baoding Power Supply Company,Hebei Baoding 071001,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第9期60-66,89,共8页
High Voltage Apparatus
基金
国家自然科学基金资助项目(52007065)
中央高校基本科研业务费专项资金资助(2022MS071)
北京市自然科学基金资助项目(3222057)。
关键词
温度
环氧树脂
电荷积聚
气固界面
离子输运
temperature
epoxy resin
charge accumulation
gas-solid interface
ion transport
