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Usage of Cubicle type Gas-Insulator Switch-gear (C-GIS) is gradually increasing in power system. During the operation of C-GIS, long-term excessive temperature rise leads to degeneration of insulation and mechanical property, which may finally leads to fatal accidents. In order to analyze the temperature distribution of the C-GIS, the model of a 40.5 kV medium voltage SF6 insulated C-GIS has been established and simulations based on electromagnetic-fluid-temperature coupling are carried out. In the simulations, eddy-current filed is solved by ansys-multiphysics to obtain the heat generation inside the C-GIS. In order to improve calculation accuracy, the contact resistance is taken into consideration and the physical characteristics of SF6 gas are considered to be related to the temperature. First, simulations with and without surrounding air environment considered are carried out and the results are compared. The type test of temperature rise is also conducted to verify the simulation results. The simulation results are found out in agreement with experimental results. Second, in order to reduce the temperature rise and improve the design of C-GIS, recommendations are put forward. The influence of the cooling system and surrounding barriers is analyzed by numerical simulation.

Temperature Rise Simulation of Medium Voltage Cubicle Type Gas Insulated Switch-Gear Based on Coupling of Multi-Physical Fields