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Method and apparatus to diagnose current sensor polarities and phase associations for a three-phase electric power system

  • US 10,088,546 B2
  • Filed: 05/01/2014
  • Issued: 10/02/2018
  • Est. Priority Date: 08/09/2013
  • Status: Active Grant
First Claim
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1. A system for a three-phase electric power system having three phases, said system comprising:

  • a plurality of voltage sensors structured to sense three-phase voltages of said three-phase electric power system;

    a plurality of current sensors structured to sense three-phase currents of said three-phase electric power system;

    a number of analog-to-digital converters structured to convert the sensed three-phase voltages and the sensed three-phase currents of said three-phase electric power system to corresponding digital values; and

    a processor configured and programmed to calculate from the corresponding digital values at least two phase angles between voltage and current for at least two of said three phases of said three-phase electric power system, determine a configuration for at least two of said plurality of current sensors based on, for each of said at least two of said plurality of current sensors, a predetermined wiring configuration of said three-phase electric power system and a corresponding one of the at least two phase angles being within a corresponding predetermined angular range, wherein the configuration for each of the at least two of said plurality of current sensors indicates a polarity for each of the at least two of said plurality of current sensors and a phase of the three-phase electric power system with which each of the at least two of said plurality of current sensors is associated, and output the determined configuration for each of the at least two of said plurality of current sensors.

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