Estimation of the turn-to-turn short circuit effect on the induction motor operation quality

severe operating conditions. Because of the turn-to-turn short circuit mode specificity, application of a standard method for calculating motor characteristics is impossible in this case. A modifica-tion of the classic mathematical model for calculating currents and torques under rotor circuit unbalanced condition is presented as a solution of the problem. As a result of numerical simula-tion, the dependences of phase currents of the stator and rotor windings, the angular frequency of the rotor, as well as static mechanical characteristics of the machine in the turn-to-turn short circuit mode in one of the rotor phases are shown.Based on the results obtained, criteria are pointed out that make it possible to conclude that it is advisable to continue the damaged motor operation. As future research, it is possible to create a real-time diagnostic system based on the developed algorithm for calculating symmetric modes of an induction motor.