Finite Element Model for the Study of Inter-Turn Short Circuits in Induction Motors

This paper presents a finite element model for the study of the behavior of induction motors under inter-turn short circuit conditions. The main advantages of this model are its simplicity and the possibility of simulating different types of short circuits, involving different number of shorted turns located in different positions. This is achieved by means of the combination of a peculiar coil definition in the bi-dimensional finite element model with an external circuit coupled with it. The proposed model has been applied to a low-voltage random-wound induction motor, especially rewound for this study in order to allow the authors to introduce inter-turn short-circuits in any specific place of the windings. Experimental tests were performed on this machine in healthy and short-circuit conditions and, in both cases, measurements of supply currents and electromagnetic torque were taken. The spectral analysis of these magnitudes showed a good agreement between simulation and experimental results, validating the model for this kind of study.

[1]  C. H. Rojas,et al.  Study of an induction motor working under stator winding inter-turn short circuit condition , 2003, 4th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, 2003. SDEMPED 2003..

[2]  J. S. Hsu,et al.  Monitoring of defects in induction motors through air-gap torque observation , 1995 .

[3]  J. Penman,et al.  Detection and location of interturn short circuits in the stator windings of operating motors , 1994 .

[4]  J. Sottile,et al.  Condition monitoring of stator windings in induction motors. I. Experimental investigation of the effective negative-sequence impedance detector , 2002 .

[5]  Antonio J. Marques Cardoso,et al.  Inter-turn stator winding fault diagnosis in three-phase induction motors, by Park's Vector approach , 1997 .

[6]  Peter Tavner,et al.  Condition monitoring of electrical machines , 1987 .

[7]  Gojko Joksimovic,et al.  The detection of inter-turn short circuits in the stator windings of operating motors , 2000, IEEE Trans. Ind. Electron..

[8]  Ian Culbert,et al.  Assessment of insulation condition in rotating machine stators , 1992 .

[9]  J. Sottile,et al.  An on-line method to detect incipient failure of turn insulation in random-wound motors , 1993 .

[10]  H. G. Sedding,et al.  Current monitoring for detecting inter-turn short circuits in induction motors , 2001 .

[11]  O. M. Nassar.  The Use of Partial Discharge and Impulse Voltage Testing in the Evaluation of Interturn Insulation Failure of Large Motors , 1987, IEEE Transactions on Energy Conversion.

[12]  P. G. McLaren,et al.  Modeling of large AC motor coils for steep-fronted surge studies , 1988 .

[13]  H. G. Sedding,et al.  Current monitoring for detecting inter-turn short circuits in induction motors , 1999, IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272).

[14]  A.J. Marques Cardoso,et al.  Stator winding fault diagnosis in three-phase synchronous and asynchronous motors, by the extended Park's vector approach , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).