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Harmonic measuring instrument for AC power systems with poly-phase threshold means

  • US 5,298,885 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 a poly-phase alternating current power system comprising:

  • a. means for sensing a plurality of harmonic voltage parameters on each phase coupled to the poly-phase alternating current power systems;

    b. means for determining when one of the plurality of harmonic voltage parameters exceeds a predetermined voltage threshold coupled to the means for sensing a plurality of harmonic voltage parameters;

    c. means for sensing a plurality of harmonic currents on each phase coupled to the poly-phase alternating current power system;

    d. means for determining when one of the plurality of the harmonic currents exceeds a predetermined current threshold coupled to the means for sensing a plurality of harmonic currents;

    e. 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 determining when one of the plurality of harmonic voltage parameters exceeds a predetermined voltage threshold and to the means for determining when one of the plurality of the harmonic currents exceeds a predetermined current threshold.

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