Fast Fault Location Using Travelling-Wave Based Distance Protection
J.M. Gómez-Castillo, A. Blazquez, E. Torres, D.M. Larruskain, A. Iturregi Department of Electrical Engineering, School of Engineering in Bilbao, University of the Basque Country EHU, Bilbao, Spain 2026-06-27

Abstract

Conventional protection systems rely on phasor representations that assume near-steady conditions over a power-frequency cycle, an assumption increasingly fragile under rapidly changing operating environments. These methods typically require at least one cycle to issue a trip, limiting their speed and potentially compromising system stability, particularly in networks with significant inverter-based resources and reduced inertia. Faster clearance is therefore essential to maintain secure power transfer travelling-wave techniques, which exploit the earliest high-frequency transients launched by a fault, enable sub-cycle decision-making and offer a promising foundation for fast and robust protection schemes. The paper explores the underlying principles of travelling-wave phenomena and their application to distance protection, highlighting how time-domain features can enhance speed and reliability compared with conventional phasor-based methods. Particular attention is given to high-impedance faults, assessing how the proposed ravelling-wave-based metrics can improve detection sensitivity even under severely attenuated fault currents. Finally, the proposed protection scheme is validated through a transmission system study case implemented in PSCAD, where a set of fault types and locations are examined to assess its performance, sensitivity, and robustness under diverse operating conditions.

Key words: Detection, Distance Protection, Location, Travelling-Wave, Time-Domain.

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