Loss Calculation of GIS Disconnect Switches Considering Contact Resistance and Skin Effect

GIS is widely used in power systems because of its importance in power systems and. However, the device has a compact structure and electrical contact, which can easily cause internal overheating and pose a huge risk to the safe operation of the power grid. Therefore, it is necessary to study its temperature rise. The prerequisite for obtaining accurate temperature rise of GIS disconnect switches is to obtain accurate loss results. In this paper, we use the finite element method to calculate the eddy current field loss of 110 kV GIS disconnect switches, consider the effects of contact resistance, skin effect and proximity effect, and verify the validity of the mesh; we calculate that the conductor loss accounts for 60.75% of the total loss, the contact resistance loss accounts for 24.22%, and the structure loss such as the shell is small, which has little effect on the temperature rise. The research in this paper lays a solid foundation for the temperature rise calculation of GIS disconnect switches.