M athematical model for investigation of welding forces at contacts bounce in the process of a medium voltage vacuum contactor switching on

摘要

A m athem atical m odel for determ ining th e possible welding forces of contacts at th eir bounce during th e sw itching of process taking into account internal and surface heat sources and latent h eat of phase tran sitio n s based on the Leibenson m ethod is presented. T he influence of th e shape of th e current and th e phase of voltage sw itching on th e value of th e welding force is shown. C alculations have been carried ou t th a t make it possible to determ ine th e dynam ics of the m otion of th e regions of phase transitions, th eir m axim um values th e tim e of solidification of th e contact m aterial. T h e correctness of the calculation m ethod is proved.