Diagnostics of turn-to-turn insulation of an asynchronous motor with the use of the a self-induction EMF

Abstract

The method of diagnostics of turn-to-turn insulation, which is based on the model of the weakest link, i.e., an element of turn-to-turn insulation with the lowest electrical strength, has been suggested. To determine the weakest link, it is suggested to use the self-induction EMF property of inductance, in which each coil can generate voltage in the form of a pulse, the power of which can be controlled to prevent the destruction of insulation. The block diagram and algorithm of functioning of the microcontroller device that implements this method of diagnostics of the turn-to-turn insulation of an asynchronous motor have been presented. The experimental setup for studying the suggested method and the dependences of amplitude of self-induction EMF on the interrupting current for controlled inductances have been considered