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Traveling wave based single end fault location

  • US 10,295,585 B2
  • Filed: 11/08/2017
  • Issued: 05/21/2019
  • Est. Priority Date: 11/11/2016
  • Status: Active Grant
First Claim
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1. A system to determine a relative location of a fault in a power line of an electric power delivery system comprising:

  • a traveling wave detector in electrical communication with a first location on the power line of the electric power delivery system to;

    detect an arrival time (TPK) of each of a plurality of traveling wave amplitude peaks (VPKs) received at the first location on the power line, andidentify hypothesis TPKs as TPKs corresponding to VPKs detected after a first detected VPK that have the same polarity as the first detected VPK at the first location on the power line; and

    a fault location determination subsystem comprising at least one processor and a memory to;

    calculate a fault reflection value, F(H), for each hypothesis TPK,calculate remote reflection value, R(H), associated with a remote location on the power line, for each hypothesis TPK using the hypothesis TPK, a length of the power line between the first location and the remote location, and traveling wave propagation time (TWLPT),compare the F(H) and the R(H) of each hypothesis TPK with a set of time difference values (DT set) that includes time difference values between the pair-combinations of detected TPKs associated with VPKs received after the first detected VPK,determine a first number of matches (NM) as the number of time difference values in the DT set that match the F(H) of each hypothesis TPK, anddetermine a second number of matches (N1_M) as the number of time difference values in the DT set that match the R(H) of each hypothesis TPK; and

    a fault distance calculation subsystem to calculate a distance from the first location to a fault location based, at least in part, on;

    (i) the length of the power line between the first location and the remote location,(ii) the traveling wave line propagation time (TWLPT), and(iii) one of the hypothesis TPKs selected based on a function of NM and N1_M.

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