Remote automatic meter reading apparatus

  • US 5,590,179 A
  • Filed: 03/08/1995
  • Issued: 12/31/1996
  • Est. Priority Date: 02/12/1993
  • Status: Expired due to Fees
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First Claim
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1. A remote metering system, including a central computer and a plurality of digital meters installed at locations remote from said central computer, said central computer including communicating means for remotely communicating with each of said plurality of digital meters, each of said plurality of digital meters including:

  • a current sensing circuit and voltage sensing circuit for sensing current and voltage, respectively, of electricity passing through said meter and producing current and voltage signals indicative of a magnitude sensed current and voltage;

    an analog-to-digital converter, responsive to said current and voltage signals, for producing a plurality of digital signals at predetermined time intervals indicative of said sensed current and voltage;

    processing means, responsive to said plurality of digital signals, for calculating an amount of electrical power passing through said meter and producing consumption signals indicative of consumed power for each predetermined time interval;

    memory means, responsive to said processing means, for storing data indicative of said consumed power; and

    power outage detection means, responsive to said voltage sensing circuit, for detecting a power outage condition and storing outage data indicative of said power outage condition in said memory means, wherein said power outage detection means includes outage type determination means for determining if said power outage condition is one of a first type power outage condition and a second type power outage condition, wherein said power outage detection means includes means for disabling operation of said meter responsive to a determination that said power outage condition is a first type power outage condition.

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