外部环境温度与内部气压对HVDC GIL表面电荷积聚的影响  

Effect of external ambient temperature and internal gas pressure on surface charge accumulation of HVDC GIL

作　　者：张雨啸 张磊 唐忠 ZHANG Yuxiao;ZHANG Lei;TANG Zhong(College of Computer Science and Technology,Shanghai University of Electric Power,Shanghai 201306,China;School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学计算机科学与技术学院,上海201306 [2]上海电力大学电气工程学院,上海200090

出　　处：《绝缘材料》2024年第9期80-87,共8页Insulating Materials

基　　金：国家自然科学基金资助项目(51677113)。

摘　　要：盆式绝缘子的表面电荷积聚是制约高压直流GIL发展的重要因素之一,而GIL内部热传递过程会加剧表面电荷的积聚进程。本文建立了电荷积聚的电-热场耦合数学模型,模拟了不同外部环境温度和内部气体压力下高压直流GIL内部温度随时间的变化情况,进一步研究了外部环境温度恒定及时变情况下的表面电荷积聚特征,并分析了其对表面电荷积聚的影响。结果表明:在外部环境温度为恒定值的情况下,外部温度每升高10℃,绝缘子表面的稳态温度会升高9.2%以上,绝缘子的稳态表面电荷密度也会因此增加17.3%以上。当考虑到外部环境温度随时间变化时,绝缘子表面的温度在持续上升一段时间后,最终会在特定温度范围内波动,此时绝缘子表面电荷密度与外部环境平均温度下的表面电荷密度值近似相等。此外,绝缘子的表面温度和电荷密度会随着气压的升高而减小。研究结果有望为直流GIL的设计和运行提供参考,从而提高直流GIL运行的安全性和稳定性。The surface charge accumulation of basin insulators is one of the important factors restricting the development of HVDC GIL,and the heat transfer inside the GIL would aggravate the surface charge accumulation.In this paper,an electrical-thermal coupling simulation model of charge accumulation was established.The time-varying temperature distribution inside the GIL under different external ambient temperature and gas pressure was simulated.The surface charge accumulation characteristics under constant and time-varying external ambient temperature were studied,and its effect on the surface charge accumulation was also analyzed.The results show that when the external ambient temperature is a constant value,the external temperature increases every 10℃,the steady-state temperature on the insulator surface increases by more than 9.2%,and the steady-state surface charge density of insulator increases by more than 17.3%.When the external ambient temperature changes with time,the temperature on the insulator surface eventually fluctuates with time around a stable value after continuously rising for a period of time,and the surface charge density is approximately equal to that under the average external ambient temperature.In addition,the surface temperature and charge density of the insulator decrease with the increase of gas pressure.The research results are expected to provide reference for the design and operation of DC GIL,which can improve the safety and stability of DC GIL operation.

关 键 词：盆式绝缘子 高压直流GIL 表面电荷积聚 温度分布 电-热耦合 有限元仿真 多物理场 SF_(6) 

分 类 号：TM852[电气工程—高电压与绝缘技术]