应用高频磁环抑制GIS中特快速暂态过电压和雷电过电压仿真分析

GIS变电站内的隔离开关切合空载母线操作时,引起的特快速暂态过电压(VFTO)及输电线路雷击产生的雷电过电压对变电站内的电气设备特别是变压器构成威胁。采用在隔离开关与母线之间、变压器与避雷器之间安装高频磁环(并联阻尼电阻)的保护方法,并结合实例进行仿真分析,结果表明,安装高频磁环(并联阻尼电阻)能有效降低VFTO和雷电过电压的幅值和陡度。

Analysis and Simulation of an Approach to Suppress Very Fast Transient Overvoltage and Lightning Overvoltage in GIS by High Frequency Magnetic Ring

Very fast transient overvoltage(VFTO)caused by the operation of disconnect switches and lightning overvoltage caused by lightning strike on the transmission line,can cause a great threat to the electrical equipment particularly the transformers in gas insulated substation(GIS).The protection measures of the installation of high-frequency magnetic ring(paralleled damping resistance)between the transformer and arrester,disconnect switch and the bus bar is adopted,the simulation and analysis are carried out combined with applications,and the results show that the VFTO and lightning over-voltage ’s amplitude and steepness can be reduced effectively by the installation of high-frequency magnetic ring(paralleled damping resistance).