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Experimental study of inter-laminar core fault detection techniques based on low flux core excitation

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7 Author(s)
Sang Bin Lee ; Dept. of Electr. Eng., Korea Univ., Seoul, South Korea ; Kliman, G.B. ; Shah, M.R. ; Dongwook Kim
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A comparison between two inter-laminar stator core insulation failure detection techniques for generators based on low flux core excitation is presented in this paper. The two techniques under consideration are: 1) the iron core probe based method developed recently and 2) the existing air core probe based method. A qualitative comparison of the two techniques is presented along with an experimental comparison on a 120-MW generator stator core. The test results are compared in terms of fault detection sensitivity, signal to noise ratio, and ease of interpretation, which are the main requirements for stator core inspection. In addition to the comparison, the performance of the iron core probe technique for machines with short wedge depression depth is presented along with the recent improvements in the algorithm. It is shown that the main requirements for stator core inspection are significantly enhanced with the new iron core probe-based core fault detector.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:21 ,  Issue: 1 )

Date of Publication:

March 2006

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