Traveling wave based single end fault location
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 the power line of the electric power delivery system to;
detect an arrival time (TPK) and associated peak amplitude (VPK) of each of a plurality of traveling waves received at a first location on the power line, andidentify hypothesis TPKs as TPKs corresponding to traveling waves detected after a first detected traveling wave that have the same polarity as the first detected traveling wave; and
a fault location determination subsystem comprising at least one processor and a memory to;
calculate a set of expected traveling wave arrival times (ETWs) for each hypothesis;
determine a first number of matches (NS) of the ETWs of each hypothesis with the detected TPKs;
calculate a merit value (N) of each of the hypotheses based on a function of the number of matches (NS) of each respective hypothesis;
select one of the hypotheses based on the merit value (N); and
calculate a location of the fault relative to the first location based on the length of the power line, a traveling wave line propagation time (TWLPT), and the selected hypothesis.
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Abstract
Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.
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Citations
23 Claims
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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:
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a traveling wave detector in electrical communication with the power line of the electric power delivery system to; detect an arrival time (TPK) and associated peak amplitude (VPK) of each of a plurality of traveling waves received at a first location on the power line, and identify hypothesis TPKs as TPKs corresponding to traveling waves detected after a first detected traveling wave that have the same polarity as the first detected traveling wave; and a fault location determination subsystem comprising at least one processor and a memory to; calculate a set of expected traveling wave arrival times (ETWs) for each hypothesis; determine a first number of matches (NS) of the ETWs of each hypothesis with the detected TPKs; calculate a merit value (N) of each of the hypotheses based on a function of the number of matches (NS) of each respective hypothesis; select one of the hypotheses based on the merit value (N); and calculate a location of the fault relative to the first location based on the length of the power line, a traveling wave line propagation time (TWLPT), and the selected hypothesis. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of calculating a relative location of a fault in a power line of an electric power delivery system comprising:
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detecting, via a detector in electrical communication with the power line of the electric power delivery system, an arrival time (TPK) and peak amplitude (VPK) of each of a plurality of traveling waves at a first location on the power line; identifying TPKs corresponding to VPKs detected after a first detected traveling wave that have the same polarity as the first detected traveling wave as hypotheses; calculating, via a processor, a set of expected traveling wave arrival times (ETWs) for each hypothesis; determining a first number of matches (NS) of the ETWs of each hypothesis with the detected TPKs; calculating a merit value (N) of each of the hypotheses based on a function of the number of matches (NS) of each respective hypothesis; selecting one of the hypotheses based on the merit value (N); and calculating a location of the fault relative to the first location based on the length of the power line, a traveling wave line propagation time (TWLPT), and the selected hypothesis. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A computer-implemented method, comprising:
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detecting, via a detector in electrical communication with a power line of a electric power delivery system, an arrival time (TPK) and peak amplitude (VPK) of each of a plurality of traveling waves at a first location on the power line of the electric power delivery system; and identifying TPKs corresponding to traveling waves detected after a first detected traveling wave that have the same polarity as the first detected traveling wave as hypotheses; calculating, via a processor, a set of expected traveling wave arrival times (ETWs) for each hypothesis; identifying a first number of matches (NS) of the calculated ETWs with the detected TPKs; calculating a fault reflection value, F(H), for each hypothesis; calculating a remote reflection value, R(H), for each hypothesis; determining a second number of matches (NM) of the F(H) of each hypothesis with a set of time differences (DT set) between pair-combinations of the detected TPKs received after the first detected traveling wave; determining a third number of matches (N1_M) of the R(H) with the time differences in the DT set; selecting one of the hypothesis based on at least one of NS, NM, and N1_M; and calculating a distance from the first location to the fault location based on a function of the length of the power line, a traveling wave line propagation time (TWLPT), and the selected hypothesis. - View Dependent Claims (22, 23)
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Specification