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Power monitor unit

  • US 5,469,365 A
  • Filed: 01/25/1993
  • Issued: 11/21/1995
  • Est. Priority Date: 01/25/1993
  • Status: Expired due to Fees
First Claim
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1. A unit for use in a power service area at locations downstream from customer metering units, for monitoring power and reporting to a central location comprising:

  • a first input receiving an A/C power signal to be monitored;

    means responsive to the A/C power signal for sensing a zero crossing of the A/C power signal;

    means responsive to the zero crossing of the A/C power signal for timing a delay interval substantially equal to a 90 degree phase shift in the A/C power signal;

    means responsive to the delay interval for sampling the A/C power signal at the end of the delay interval;

    a static recording medium for recording samples of the A/C power signal;

    processing means responsive to the recorded samples of the A/C power signal for detecting an anomaly in the A/C signal power signal in accordance with recorded configuration values;

    an interface from the processing means to a communication network distinct from the A/C power signal medium;

    said processing means further for reporting to a central location through the interface a unit-dependant time after detecting an anomaly or after a unit-dependant routine interval;

    said processing means further responsive to commands from the central location for reporting the recorded samples of the A/C power signal, for reporting a contemporaneous value of the A/C power signal, and for receiving and updating revised configuration values.

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