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The detection of inter-turn short circuits in the stator windings of operating motors

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2 Author(s)
Joksimovic, G.M. ; Dept. of Electr. Eng., Montenegro Univ., Yugoslavia ; Penman, J.

This paper develops a winding-function-based method for modeling polyphase cage induction motors with inter-turn short circuits in the machine stator winding. Analytical consideration which sheds light on some components of the stator current spectra of both healthy and faulty machines is developed. It is shown that, as a result of the nature of the cage rotor, no new frequency components of the line current spectra can appear as a consequence of the fault. Only a rise in some of the frequency components which already exist in the line current spectra of a healthy machine can be observed. An experimental setup comprising a 3 kW delta-connected motor loaded by a generator was used to validate this approach. The experimental results obtained clearly validate the analytical and simulation results

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:47 ,  Issue: 5 )