Taking gas insulation switch(GIS) as the research object

through analyzing the influences of contact resistance and environmental factors such as temperature

wind speed and radiation on the temperature distribution of GIS

a field-circuit combination calculation method of GIS contact resistance based on temperature detection is proposed. It is used to quantitatively predict the contact state of GIS. In this paper

the electromagnetic-heat-flow multiphysics coupling model of GIS is established

and an equivalent heat circuit model that considers heat conduction

heat convection and heat radiation is proposed. Then

the multiphysics numerical simulation results are used as training samples

the equivalent thermal resistance of SF6 gas convective heat transfer

the equivalent thermal resistance between the inner and outer surfaces of the shell and the equivalent thermal resistance between the outer surface of the shell and the air can be obtained. Using this field-circuit combined prediction model

the contact resistance can be calculated by detecting the temperature difference between the upper and lower representative measuring points of the shell

which can be used to evaluate the contact state. At last

by comparing with the test results

the feasibility and superiority of the evaluation method are verified.