Schweitzer Engineering Laboratories, Inc.

Yajian Tong

Bogdan Zdzislaw Kasztenny

Armando Guzman-Casillas

Mangapathirao Venkata Mynam

Edmund O Schweitzer, Iii

Gandhali P Juvekar

A technique and a system are used to analyze incremental quantities. The instantaneous electrical measurements associated with a loop in a multiple-phase electric power delivery system are obtained before a fault occurred on the loop and after the same fault occurred on the same loop, and differences between the instantaneous electrical measurements at different times are used to determine incremental quantities, which are used to determine a location of the fault on the loop. Multiple loops in the multiple-phase electric power delivery system are monitored to determine corresponding fault locations on each loop.

Incremental quantities-based fault locating technique and system

A single-ended traveling wave fault location estimation is calculated using this disclosure, and a confidence level is determined based on available independent fault location estimations. Hypothesis are calculated based on traveling wave times and values, wherein the values indicate a polarity that is the same as the first received traveling wave. Hypothesis are then compared against results of other fault location estimations, and confidence levels assigned accordingly. The fault location is then calculated and displayed based on the hypothesis and confidence levels.

Electric power fault protection device using single-ended traveling wave fault location estimation

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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Pullman, WA, United States of America

Yajian Tong