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Method and apparatus for determining frequency of an alternating current signal of an electric power system

  • US 20030178982A1
  • Filed: 03/21/2002
  • Published: 09/25/2003
  • Est. Priority Date: 03/21/2002
  • Status: Active Grant
First Claim
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1. An apparatus for determining frequency of an alternating current (AC) signal of an electric power system, said AC signal having a period between zero crossings thereof, said apparatus comprising:

  • means for measuring the period of said AC signal between one of said zero crossings and a subsequent one of said zero crossings to provide a measured period value; and

    a processor comprising;

    a memory collecting at least five consecutive values of said measured period values, and a routine choosing a median value from said measured period values and determining said frequency based upon said median value.

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