南方电网技术2017，Vol.11Issue(8)：49-54,6.DOI:10.13648/j.cnki.issn1674-0629.2017.08.007
陡波下500 kV GIS隔离开关室的暂态电场特性
Transient Electric Field Characteristics for Disconnector Room of 500 kV GIS Under Steep Wave
摘要
Abstract
To accurately guide the insulation design of 500 kV disconnector room of GIS, it is necessary to study the dynamic distribu-tion characteristics of electric field caused by structure and voltage waveform.The transient electric field characteristics of 500 kV dis-connector room under very fast transient overvoltage ( VFTO) and lightning wave are studied based on time domain finite difference method.Results show that no matter the disconnector is closed or opened, high frequency oscillations will occur in the electric field of each node, moreover, the electric field distribution will change constantly under VFTO.Oscillations have a high amplitude under 4 ns and 20 ns wavefront voltage time, which may seriously threaten equipment insulation.Especially, when the 4 ns ramp wave voltage is applied, the maximum value of electric field is about four～five times of the steady-state value and the oscillation frequency is higher than that of coaxial bus duct.So transient electric field must be calculated to check the insulation design.Under lightning wave, elec-tric field of each node in the disconnector is almost non-reflex, and can be verified by the calculation result of electrostatic field.关键词
隔离开关室/暂态电场/雷电波/特快速暂态过电压/时域有限差分法Key words
disconnector room/transient electric field/lightning wave/very fast transient overvoltage (VFTO)/time domain finite difference method分类
信息技术与安全科学引用本文复制引用
杨瑞,贺恒鑫,何俊佳..陡波下500 kV GIS隔离开关室的暂态电场特性[J].南方电网技术,2017,11(8):49-54,6.基金项目
国家工程实验室开放基金资助项目(NEL201604).Supported by the National Engineering Laboratory Open Fund (NEL201604). （NEL201604）
