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Identification of inter-turn insulation faults in induction motor

Gopu Venugopal (Department of Electrical and Electronics Engineering, Sri Ramakrishna Engineering College, Coimbatore, India)
V. Gopalakrishnan (Anna University, Chennai, India)
S.P. Rajkumar (Anna University, Chennai, India)

Engineering Computations

ISSN: 0264-4401

Article publication date: 9 August 2019

Issue publication date: 9 August 2019




Induction motors (IMs) are considered one of the most important elements of the industrial process. However, in this environment, these machines are subject to electrical and mechanical faults, which may cause significant financial losses. Thus, the purpose of this paper is to propose an optimal identification of inter-turn insulation faults present in the random wound IM.


The design approach deals with a simple technique, using the effect of the inter-turn fault in modifying the high-frequency components of the applied pulse-width-modulated voltage.


The change in insulation strength between the turns affects the capacitive component of the stator line current. Resulting changes in wave shapes of the applied voltage have been studied with respect to both the distance of inter-turn faults from line end and reduction in the insulation strength, and hence in the insulation resistance value.


Studies have been conducted by using computer simulation and validated by experiments. There is ample evidence that an impending and progressing inter-turn fault can be identified in adjustable speed drives driven by frequency converters by studying line-end coil-voltage waveforms.



Retraction notice: The publishers of Engineering Computations wish to retract the article Venugopal, G., Gopalakrishnan, V. and Rajkumar, S.P. (2019), “Identification of inter-turn insulation faults in induction motor”, published in Engineering Computations, Vol. 37 No. 2, pp. 546-565.

It has come to our attention that the third author of this paper, Professor S.P. Rajkumar, was unknowingly included as an author and did not contribute to the paper. Additionally, a large proportion of this article is copied, without attribution, from several earlier articles by Professor S.P. Rajkumar, and a number of other authors. These were:

S. Ponnuswamy Rajkumar, J. Sudesh Johny and A. Ebenezer Jeyakumar (2011), ‘Identification of Impending Interturn Faults in Random Wound Induction Motors Used in Adjustable Speed Drives’, WSEAS Transactions on Circuits and Systems, Vol 10, Issue 2, pp. 59-68,

Rajkumar, S.P., Gopu, V. and Anurag, G. (2017), “Effect of inter-turn faults in modifying Line-end Coil Voltage Waveforms pertaining to low voltage Random Wound Induction Motors”, International Journal of Applied Engineering Research, Vol. 12, Issue 1, pp. 441-446.

The Engineering Computations submission guidelines make it clear that only individuals who have made a substantial and meaningful contribution to the submission should be included as authors, and that articles must be original and must not infringe any existing copyright. The publishers of the journal sincerely apologise to the readers, Professor S.P. Rajkumar, and all the original authors of the above mentioned articles.


Venugopal, G., Gopalakrishnan, V. and Rajkumar, S.P. (2019), "Identification of inter-turn insulation faults in induction motor", Engineering Computations, Vol. 37 No. 2, pp. 546-565.



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