In this paper

the heat transfer principle of heat pipe is studied firstly

and the interaction process of condensation and evaporation of liquid and gaseous working medium in the heat pipe is studied based on CFD modeling and simulation

the characteristics of high thermal conductivity of the heat pipe are verified by comparing the temperature difference and thermal resistance between the hot and cold end under the same boundary condition with the copper rod. Then

the temperature rise heat transfer process of the large capacity gas-filled switchgear is analyzed. For the gas-filled cabinet adopting heat pipe structure

the heat pipe model is subjected to equivalent treatment in the simulation analysis of temperature field

the calculation efficiency can be greatly improved by neglecting the complicated phase change heat transfer process. The deviation between experiment and simulation results less than 10% is verified by the test. Finally

a kind of insulating heat pipe structure for improving the efficiency of heat pipe is proposed. Through reasonable design of internal cavity

insertion of copper tube and heat transfer base of cold and hot section as well as selection of suitable working fluid medium

the requirements of insulation and heat transfer are met simultaneously. It is applied in 12 kV/4 000 A environment-friendly gas filling cabinet and has passed the test of insulation and 1.1 times temperature rise.