ANALYSIS OF EMERGENCY MODES OF TRACTION INDUCTION ELECTRIC DRIVE

The operation process of the traction asynchronous electric drive rolling stock may be accompanied by occurrence emergency modes, which are characterized current overloads and lead to damaging power circuits or mechanical part drive. Therefore, studying electromagnetic processes that occur in modes is relevant, particular, for developing systems aimed at diagnosing protecting equipment. Ukrainian foreign studies an were analyzed. most frequent causes failures static converters, therefore it advisable conduct analysis specifically autonomous inverters. Using Matlab/Simulink software environment a simulation model vector control system with spatial pulse width modulation was developed, short-circuit switch voltage inverter disappearance supply simulated. oscillograms these shown compared nominal mode operation. results show analyzed even short duration less than 0.5 s, can significant damage Both cases overloads: case circuit switch, three-fold excess phase observed, during recovery after failure, currents increase starting level, as well almost instantaneous on input filter capacitor occurs. Fourier A above shows coefficient nonlinear distortions 65 %, decrease amplitude main harmonic 60 appearance number subharmonics. In circuit, amplitudes subharmonics exceed fundamental harmonic. addition, returning from normal first moment time reduced resistance (20 % nominal), then exit parameters.