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Fault detection in electric power delivery systems using underreach, directional, and traveling wave elements

  • US 9,594,112 B2
  • Filed: 09/16/2015
  • Issued: 03/14/2017
  • Est. Priority Date: 09/16/2014
  • Status: Active Grant
First Claim
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1. A system configured to detect a fault in an electric power delivery system, comprising:

  • a data acquisition subsystem configured to receive a plurality of representations of electrical conditions associated with at least a portion of the electric power delivery system;

    an incremental quantities subsystem configured to calculate an incremental current quantity and an incremental voltage quantity based on the plurality of representations of electrical conditions associated with the at least a portion of the electric power delivery system;

    a fault detection subsystem configured to;

    determine a fault type based on the incremental current quantity and the incremental voltage quantity;

    select an applicable loop quantity based on the fault type;

    declare a fault based on the applicable loop quantity, the incremental voltage quantity, and the incremental current quantity; and

    a protective action subsystem configured to implement a protective action based on the declaration of the fault;

    a directional subsystem configured to determine a direction to the fault;

    wherein the direction subsystem is configured to determine the direction to the fault based on a resistive behavior of the electric power delivery system during a window of time following the fault and to determine the direction to the fault based on a resistive-inductive behavior of the electric power delivery system after the window of time following the fault.

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