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Electronic meter digital phase compensation

  • US 5,017,860 A
  • Filed: 06/25/1990
  • Issued: 05/21/1991
  • Est. Priority Date: 12/02/1988
  • Status: Expired due to Fees
First Claim
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1. In an electronic watthour meter for metering the consumption of electrical energy in polyphase power lines, the combination comprising:

  • a first analog to digital converter for providing a first digital signal in response to current flow in each line of said power lines;

    a second analog to digital converter for providing a second digital signal in response to voltage applied to each of said power lines;

    a multiplier for multiplying said first digital signal and said second digital signal to derive an indication of electrical energy consumption on said power lines; and

    compensation means for providing a first timing signal to said first analog to digital converter and a second timing signal to said second analog to digital converter, said compensation means including phase shifting means for lead or lag phase errors by shifting the direction and amount of timing of said first timing signal relative to that of said second timing signal to provide said first and second digital signals to said multiplier substantially in time phase for all current and voltage phases of said polyphase power lines through use of a single adjustment.

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