Overheating is one of the major flaws of high voltage switchgear

accurate knowledge of the law of the switchgear heat dissipation is important for switchgear thermal design.In this paper

a three-dimensional temperaturefluid field coupling calculation model is established for the KYN28A-12 switchgear as a research object.The temperature and fluid distribution in the switchgear under normal operating conditions and fan failure conditions are analyzed.The calculation results show that under normal operating conditions

the temperature at the upper end of the line is the highest at 84.73 ℃.When 2 fans fail

the switch cabinet overheats

exceeding the standard limit.Aiming at the overheating of the contacts and the incoming busbars

this article optimizes the heat dissipation of the switchgear by adding two 63 W axial fans at the top of the busbar room and adding a heat dissipation channel above the cable room.The simulation results show that this method improves the air convection in the switchgear

and the temperature of the contacts and the busbar can be reduced.The research results in this paper can provide reference for fault analysis and thermal design of switchgear.