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Method and apparatus for detecting stator faults in rotary dynamoelectric machines

  • US 5,252,915 A
  • Filed: 01/23/1992
  • Issued: 10/12/1993
  • Est. Priority Date: 01/23/1992
  • Status: Expired due to Term
First Claim
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1. A method of detecting and locating stator faults in a dynamoelectric machine having a rotor and a stator with multiturn stator coils by monitoring changes in axial leakage flux during operation of the machine, comprisingidentifying the frequencies of selected harmonic components of axial leakage flux that are to be significantly affected by the occurrence of a stator fault,detecting the axial leakage flux at each of a plurality of positions, including a datum position, distributed symmetrically around the axis of the rotor adjacent to an end winding of the stator,deriving from the detected flux at each of said positions a first signal having a value corresponding to the magnitude of the detected flux,storing the values of said first signals derived prior to the occurrence of a stator fault,deriving from the detected axial leakage flux a further signal having a value corresponding to the magnitude of said selected harmonic components,monitoring said further signal and detecting a change therein thereby detecting the occurrence of a stator fault,storing the values of said first signals derived after the occurrence of the stator fault,comparing the values of said first signals stored before and after the occurrence of a stator fault and storing the differences therebetween, and determining from said comparison a value representing the angular position of the stator fault with respect to the datum position.

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