扫频电流下不同电流频率对GIS电磁分布特性的影响

Electromagnetic distribution characteristics of GIS under sweeping current

气体绝缘开关设备(GIS)在电力传输中具有重要作用,对电力系统安全、稳定运行具有重要意义。目前,利用电力设备扫频特性对GIS机械故障进行检测的方法受到广泛关注,但缺乏对GIS在扫频电流作用下的磁场以及电磁力分布研究。为此,文中建立110 kV三相共体式GIS母线筒的有限元模型,仿真研究不同电流频率下GIS磁场及电磁力分布特征。结果表明,随着电流频率的变化,GIS内部磁场分布规律、GIS外壳和导电杆所受电磁力分布规律均不发生改变;但GIS内部磁通密度会随着电流频率增加而下降,外壳所受电磁力大小会随着电流频率的增加而增大。研究结果为利用GIS扫频特性进行机械故障检测提供了理论基础。

Gas insulation switcher(GIS)is important equipment in power system.It plays an important role in the power transmission,and is of great significance to the safe and stable operation of the power system.The method of detecting mechanical faults using sweeping frequency characteristics of power equipment has attracted wide attention,but there is few research about the magnetic field and electromagnetic force distribution of the GIS under sweeping frequency currents.In order to solve above problems,finite element model of 110 kV three-phase common type GIS is established.And the distribution characteristics of the magnetic field and electromagnetic force of the GIS under different current frequencies are simulated.The results show that with the change of current frequency,the distribution of magnetic field in the GIS and the distribution of the electromagnetic force on the GIS shell and the conductive rod do not change.However,the magnitude of magnetic field in the GIS and the magnitude of electromagnetic force on the GIS shell change with the current frequency change.Research results provide foundation for detecting mechanical faults by using frequency sweeping characteristics of the GIS.