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Correction published on 30 September 2015, see Energies 2015, 8(10), 10993-10994.

Open AccessArticle
Energies 2015, 8(7), 7020-7039; doi:10.3390/en8077020

A Novel Ground Fault Identification Method for 2 × 5 kV Railway Power Supply Systems

Department of Electrical Engineering, Escuela Técnica Superior Ingenieros Industriales, Technical University of Madrid, C/José Gutierrez Abascal, 2, Madrid 28006, Spain
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Author to whom correspondence should be addressed.
Academic Editor: William Holderbaum
Received: 21 April 2015 / Revised: 17 June 2015 / Accepted: 6 July 2015 / Published: 13 July 2015
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Abstract

The location of ground faults in railway electric lines in 2 × 5 kV railway power supply systems is a difficult task. In both 1 × 25 kV and transmission power systems it is common practice to use distance protection relays to clear ground faults and localize their positions. However, in the particular case of this 2 × 25 kV system, due to the widespread use of autotransformers, the relation between the distance and the impedance seen by the distance protection relays is not linear and therefore the location is not accurate enough. This paper presents a simple and economical method to identify the subsection between autotransformers and the conductor (catenary or feeder) where the ground fault is happening. This method is based on the comparison of the angle between the current and the voltage of the positive terminal in each autotransformer. Consequently, after the identification of the subsection and the conductor with the ground defect, only the subsection where the ground fault is present will be quickly removed from service, with the minimum effect on rail traffic. This method has been validated through computer simulations and laboratory tests with positive results. View Full-Text
Keywords: ground faults; protection; 2 × 25 kV; fault location; railways ground faults; protection; 2 × 25 kV; fault location; railways
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MDPI and ACS Style

Serrano, J.; Platero, C.A.; López-Toledo, M.; Granizo, R. A Novel Ground Fault Identification Method for 2 × 5 kV Railway Power Supply Systems. Energies 2015, 8, 7020-7039.

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