The widespread application of Gas Insulated Switchgear(GIS) necessitates the estimation of its temperature distribution to prevent potential overheating failures.This paper employs the finite element method to study the temperature characteristics of GIS equipped with a 252 kV basin-type insulator under DC excitation.A geometric model of horizontal installation is established to obtain the temperature distribution in a three-dimensional model

and a corresponding experimental platform is set up to validate the simulation model.The results show that with the increase of conductor load current

the overall temperature of GIS increases by 14 ℃ because joule heat is proportional to the square of load current.Increases in ambient temperature and decreases in internal gas pressure also lead to varying degrees of temperature rise in the GIS

as these conditions cause changes in the physical property parameters of the internal gas. Therefore

it is necessary to pay attention to the temperature distribution of GIS under different operating conditions during actual operations.It has guiding significance for the prediction and detection of GIS temperature distribution

which can warn the deterioration of insulation performance caused by high temperature

and also has certain guiding significance for the design of insulators.