摘要
随着城市供电集约化的不断推进,气体绝缘金属封闭输电线路(GIL)在城市变电站中的应用愈加广泛。而在特大型城市上海,有着大容量、集成化以及环境友好性等特点的GIL已经逐渐替代了敞开型母线,被大规模地应用于城区变电站中。但在运行过程中发生过多起GIL内支撑绝缘子局部放电故障。结合35 kV气体绝缘母线的专项技术改进工作,建立有限元模型对GIL支撑绝缘子局部放电产生机理进行仿真计算,提出一种改进技术方案并进行理论验证。仿真及实际运行结果显示,改进方案能够较好地解决支撑绝缘子放电故障,提高了运行的可靠性。
As the power supply intensity keeps growing in large cities, the gas - insulated metal - enclosed transmission line （GIL）has been widely used in urban substations. Especially in the ultralarge cities such as Shanghai, GII. has gradually substituted the traditional open -type bus benefited from its large capaeity and smaller space demand. However, several partial discharge faults have occurred on the support insulator during the operation. A finite element model is establisbed and the mechanism of partial discharge is simulated. With the calculation result, an effective improvement scheme is proposed. The model simulation and practical implementation show that the improvement scheme can eliminate the partial discharge on support insulator, which can greatly improve the operation reliability of GIL.
出处
《四川电力技术》
2018年第1期49-52,73,共5页
Sichuan Electric Power Technology
关键词
GIL
支撑绝缘子
局部放电
有限元
gas- insulated metal- enclosed transmission line （GIL）
support insulator
partial diseharge
finite element
