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Power quality utility metering system having waveform capture

  • US 6,675,071 B1
  • Filed: 01/08/1999
  • Issued: 01/06/2004
  • Est. Priority Date: 01/08/1999
  • Status: Expired due to Term
First Claim
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1. In an electrical energy meter containing means therein for metering a quantity of electrical energy generated by a supplier and transferred via a power supply line to a load during an energy measurement time interval, a method of monitoring variations in the electrical energy, comprising the steps of:

  • a) sensing a line voltage transferred via the power supply line to the load during the energy measurement time interval;

    b) detecting a variation in a magnitude of the sensed line voltage relative to an acceptable voltage level, wherein the variation exceeds a first variation threshold;

    c) capturing a first waveform of the sensed line voltage corresponding to the time when said variation is detected;

    d) detecting a subsequent reduction in the variation of the magnitude of the sensed line voltage such that the variation is equal to or less than the first variation threshold; and

    e) capturing a second waveform of the sensed line voltage corresponding to the time when the subsequent reduction in the variation is detected.

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