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Harmonic measuring instrument for AC power systems with latched indicator means

  • US 5,298,888 A
  • Filed: 08/21/1992
  • Issued: 03/29/1994
  • Est. Priority Date: 08/21/1992
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring voltage harmonics and current harmonics on an alternating current power system comprising:

  • a. means for sensing a harmonic voltage and a harmonic current coupled to the alternating current power system;

    b. means for comparing both the harmonic voltage to a predetermined voltage threshold and the harmonic current to a predetermined current threshold, said means for comparing coupled to the means for sensing; and

    c. means for indicating when either the predetermined voltage threshold is exceeded, the predetermined current threshold is exceeded or both the predetermined voltage threshold and the predetermined current threshold are exceeded simultaneously, the means for indicating coupled to the means for comparing.

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