The Use of Dielectric Spectroscopy for Detection of Insulation Defects in End Turns of Medium Voltage Motors

Artificial defects were introduced inside the insulation of the end turns of a medium-voltage motor. Low-frequency dielectric analysis was conducted at 30 °C in the range 10 -2 -10 3 Hz. The missing electrode which is required for the measure was provided by immersion of the end turns in water durin...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2012-12, Vol.27 (4), p.905-911
Main Authors: Tran, T., Gallot-Lavallée, Olivier, Rain, P., Tripot, G.
Format: Article
Language:English
Subjects:
AC motors
Dielectrics
Electric power
Engineering Sciences
Fault diagnosis
Insulation testing
Spectroscopy
water
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Summary:Artificial defects were introduced inside the insulation of the end turns of a medium-voltage motor. Low-frequency dielectric analysis was conducted at 30 °C in the range 10 -2 -10 3 Hz. The missing electrode which is required for the measure was provided by immersion of the end turns in water during the 10-min testing. The seven end turns that were considered had each a specific defect. Dielectric analysis enabled the detection and identification of six among the seven defects under consideration. The capacitance at 1 kHz proved to be a reliable marker for identification. The differences between the models with defects and the reference model are qualitatively justified in terms of dielectric properties.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2012.2214783