The mechanism of occurrence of overvoltage when disconnecting low-voltage short-circuited motors.
The results of a qualitative analysis of more than a thousand oscillograms of switching overvoltages occurring when the idling is disconnected in asynchronous motors of the A2 and 4A series are given. and steep fronts of "nail files" that are dangerous for coil insulation. The equal probability of failure of any section of the phase in the weakest link is explained. not. To increase the service life of electric motors, the use of a protection circuit on tanks and varistors has been proposed.