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Traveling wave based relay protection

  • US 7,973,536 B2
  • Filed: 03/13/2009
  • Issued: 07/05/2011
  • Est. Priority Date: 07/15/2004
  • Status: Expired due to Fees
First Claim
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1. A method of protecting a power apparatus from a fault in an AC electrical power network that operates at a fundamental power frequency, the method comprising:

  • receiving a first signal from a first Rogowski coil positioned to filter a first traveling wave current on a first transmission line of the AC electrical power network from a current component corresponding to the fundamental power frequency, wherein the first signal is indicative of a polarity of the first traveling wave;

    receiving a second signal from a second Rogowski coil positioned to filter a second traveling wave current on a second transmission line of the network from a current component corresponding to the fundamental power frequency, wherein the second signal is indicative of a polarity of the second traveling wave;

    determining, based on the first signal and the second signal, the location of the fault in the network;

    halting a current flow on a transmission line of the network based on the determination of the fault location;

    generating a first tracking pulse having a predetermined amplitude and width in response to a first detected traveling wave current that exceeds a first predetermined threshold value; and

    generating a second tracking pulse having a predetermined amplitude and width in response to a second detected traveling wave current that exceeds a second predetermined threshold value.

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