Electrical quantities can be determined in a two-circuit power transmission line on the unobserved side, which enables the application of effective algorithms for determining the fault localization and identifying a faulted branch. However, the evaluation of currents along with voltages is not always possible, except in the cascade tripping mode of a faulted circuit. This article discusses the algorithm for solving the same problems, without evaluating unobservable currents and hence without the need for a cascade tripping. This solution became possible because a method was discovered for evaluating currents at the site of the supposed short circuit. In the case of circuit symmetry, the algorithm is simplified because the mutual inductance between circuits is taken into account only in the zero sequence, and two-wire channels of centered values are modeled autonomously. Theoretical provisions are illustrated using a real power line example with branches.
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Translated from Élektricheskie Stantsii, No. 11, December, 2021, pp. 47 – 52. DOI: https://doi.org/10.34831/EP.2021.1084.11.007
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Lyamets, Y.Y., Nikonov, I.Y. Fault Recognition in one of the Circuits in a Two-Circuit Power Transmission Line with One-Way Surveillance. Power Technol Eng 56, 121–126 (2022). https://doi.org/10.1007/s10749-023-01483-2
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DOI: https://doi.org/10.1007/s10749-023-01483-2