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Core monitor that uses rotor shaft voltages

  • US 5,032,826 A
  • Filed: 06/19/1989
  • Issued: 07/16/1991
  • Est. Priority Date: 10/29/1987
  • Status: Expired due to Term
First Claim
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1. A generator core monitor for a generator having a frame and a rotor shaft which has first and second rotor shaft ends, comprising:

  • sensing means for sensing a voltage between ends of the rotor shaft, including;

    a first shaft brush contacting the first rotor shaft end;

    a second shaft brush contacting the second rotor shaft end; and

    differential measurement means for determining a difference in first and second differential voltages produced between the corresponding first and second shaft brushes and ground, comprising;

    first differential means for determining the first differential voltage between a first brush voltage and ground;

    second differential means for determining the second differential voltage between a second brush voltage and ground; and

    third differential means for determining the difference in said first and second differential voltages; and

    analysis means for detecting changes in the difference.

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