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Energies 2018, 11(12), 3387;

New Differential Protection Method for Multiterminal HVDC Cable Networks

Department of Electrical Engineering, ETS Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutierrez Abascal, 2, 28006 Madrid, Spain
Department of Electrical Engineering, ETS Ingeniería y Diseño Industrial, Universidad Politécnica de Madrid, C/Ronda de Valencia, 3, 28012 Madrid, Spain
Author to whom correspondence should be addressed.
Received: 6 November 2018 / Revised: 20 November 2018 / Accepted: 27 November 2018 / Published: 3 December 2018
(This article belongs to the Section Electrical Power and Energy System)
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Ground faults in electrical power systems represent more than 90% of total faults. Their detection, location, and elimination are essential and must be carried out in a precise way to allow multiterminal high-voltage direct current (HVDC) cable networks to operate in stable conditions by removing only the faulty cable from service. This paper presents a new differential protection method based on the measurement of currents at both ends of the shields of power cables. This new method is cheaper and easier to set in operation compared to other protection methods that measure currents circulating in the active conductors. The values of such intensities and their polarities were evaluated to know which cable had a ground fault in a multiterminal HVDC cable network. The method was successfully validated by computer simulations, and experimental results were successfully obtained. View Full-Text
Keywords: protection relays; fault location; ground faults; HVDC protection relays; fault location; ground faults; HVDC

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Granizo Arrabé, R.; A. Platero, C.; Álvarez Gómez, F.; Rebollo López, E. New Differential Protection Method for Multiterminal HVDC Cable Networks. Energies 2018, 11, 3387.

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