Simulation Analysis of Temperature Rise of 10kV Atmospheric Pressure Sealed Air Insulated Switch Cabinet

In this paper, a simulation model was established for the 10kV atmospheric pressure sealed air insulated switch cabinet in COMSOL. The multi-physical field simulation of electrothermal coupling was carried out by finite element analysis method, and the internal temperature rise of the switch cabinet was obtained. Firstly, the internal temperature distribution rule of switch cabinet during static state operation is studied, and it is concluded that the highest temperature rise inside switch cabinet is located at the circuit breaker contacts, and the temperature decreases gradually from the circuit breaker contacts to both ends with the conductor rod of circuit breaker. Then the internal temperature distribution of the switchgear under short-circuit condition is studied. It is concluded that the temperature of the breaker contacts increases rapidly with the increase of short circuit time, and the temperature may lead to the damage of the contacts due to excessive temperature. The research results of this paper can provide some reference for temperature rise monitoring, fault diagnosis and maintenance scheme design of the switchgear.