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Diagnosing problems in an electrical system by monitoring changes in nonlinear characteristics

  • US 5,594,439 A
  • Filed: 08/24/1994
  • Issued: 01/14/1997
  • Est. Priority Date: 08/24/1994
  • Status: Expired due to Term
First Claim
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1. A method of sensing and indicating an abnormal condition in an electrical circuit, said method comprising the steps of:

  • a) measuring nonlinearity of a transfer characteristic of the electrical circuit to determine a limit value for the nonlinearity of the transfer characteristic of the electrical circuit, and at a later time, again measuring the nonlinearity of the transfer characteristic to determine a coefficient indicating the nonlinearity of the transfer characteristic;

    b) comparing said coefficient to said limit value to determine whether the nonlinearity of the transfer characteristic has become abnormal; and

    c) indicating a presence of said abnormal condition when said comparing of said coefficient to said limit value determines that the nonlinearity of the transfer characteristic has become abnormal.

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