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Power line waveform measurement system

  • US 5,027,285 A
  • Filed: 02/28/1989
  • Issued: 06/25/1991
  • Est. Priority Date: 02/28/1989
  • Status: Expired due to Fees
First Claim
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1. An AC waveform monitoring system comprising:

  • detecting means for providing a sensed analog signal;

    oscillator means coupled to said detecting means for generating a zero crossing signal;

    said oscillator means including means for synchronizing said zero crossing signal with a frequency of said sensed analog signal and means for generating a control signal representing nonsynchronous operation with said generated zero crossing signal during a power outage;

    signal processing means coupled to both said detecting means and said oscillator means for identifying a peak voltage value of said sensed analog signal responsive to said zero crossing signal, said signal processing means including voltage integrating means for identifying an integral volt-seconds value of said sensed analog signal responsive to said zero crossing signal; and

    digital processing means coupled to said signal processing means and said oscillator means for receiving said identified peak voltage value and said identified integral volt-second value, said digital processing means including memory means for storing a plurality of predetermined voltage boundary signal values; and

    program means utilizing said received peak voltage value, said received integral volt-second value and said stored predetermined signal values responsive to said zero crossing signal for identifying the presence of one of a plurality of predefined abnormal voltage events.

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