As an important component of primary equipment in substations

the abnormal heating of high voltage isolation switches would have adverse effects on their operational performance.To study the temperature field characteristics of high voltage isolation swi-tches under the coupling of multiple physical fields

taking the 110 kV GW55-126D high voltage isolation switch in a substation as an example

it establishes a finite element simulation model using COMSOL Multiphysics.It verifies the validity of the simulation model by the actual temperature measurement results in field operation.The result of research shows that the temperature field of the high voltage isolation switch tends to stabilize after 2000 s.For the temperature field of the contact finger

the temperature in the contact area is highest

slightly lower on the outer side

and lowest on the inner side.For the contacts

fingers

and various contact points

the temperature is higher near the top position.