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Electronic thermal demand module

  • US 5,006,790 A
  • Filed: 10/19/1987
  • Issued: 04/09/1991
  • Est. Priority Date: 10/19/1987
  • Status: Expired due to Term
First Claim
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1. Electronic apparatus coupled to receive from a metering connection a plurality of analog voltages representing the instantaneous line voltage and load current values of at least one phase of an electrical utility service entrance and utilizing said analog voltages to selectively calculate and selectively display parameters related to the existing load conditions, said apparatus comprising in combination:

  • (a) means for receiving and scaling said analog input voltages to produce standardized input signals;

    (b) sampling means for repetitively generating digital numbers representative of the instantaneous values of said standardized input signals;

    (c) means for correcting said digital numbers for selected variations introduced by said sampling means;

    (d) means utilizing said digital numbers to calculate said selected parameters in accordance with predetermined mathematical functions;

    (e) means for selectively displaying digital numbers representing the calculated values of said selected parameters in alphanumeric form;

    (f) means for selectively setting the digital number representative of selected ones of said parameters to a selected value in response to an input signal;

    (g) means for initiation of calibration, display and other sequences associated with said means utilizing said digital numbers.

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