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Apparatus providing on-line indication of frequency of an AC electric power system

  • US 6,519,537 B1
  • Filed: 05/09/2000
  • Issued: 02/11/2003
  • Est. Priority Date: 05/09/2000
  • Status: Expired due to Fees
First Claim
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1. Apparatus for on-line determination of the frequency of an ac signal in an ac electrical system comprising:

  • sensing means coupled to the ac system generating a sensed signal representative of said ac signal;

    means generating a double average signal from said sensed signal; and

    means generating a frequency signal indicating the frequency of said ac signal from said double average signal.

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