Heating of isolation switch is always a difficult problem to solve in power system.When the temperature of the disconnector is high,the physical,mechanical and electrical properties of the material gradually decrease due to the increase of the temperature of the parts,which accelerates the aging of the material,and reduces the service life.Eventually,the disconnector fails,causing power outages.In order to solve the problems above,the study analyzes the composition of the steady-state thermal system,derives the temperature rise calculation formula of the isolation switch,proposes the heating improvement method of the isolation switch based on the contact resistance theory,reduces the contact resistance value with equivalent parallel contact resistance,etc.,so as to improve the flow capacity of the isolation switch contact system,and reduce temperature rise.The study takes 4000 A clamp isolation switch as the research object,and conducts the calculation and verification of the example,so as to provide certain reference for solving the heating problem of the isolation switch in practical engineering.
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