Fault analysis on AC railway supply system

Noroozi, Negar; Mokhtari, Hossein; Zolghadri, Mohammad Reza; Khodabandeh, Masih; Abazai, A.; Khakshani, R. Seyyedi; Mazaheri, Samaneh

doi:10.1109/pedstc.2015.7093337

Cited by 8 publications

(9 citation statements)

References 17 publications

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“…The APSs are designed to keep voltages in admissible ranges that are given in Table 1 [10]. At the APS, the voltages are balanced between the catenary and the autotransformer neutral, and between the feeder and the autotransformer neutral, and the return current is distributed in a balanced manner between the two phases [8]. In this configuration, there is a 180 • phase difference between the feeder and the catenary [8], [11].…”

Section: Tablementioning

confidence: 99%

“…Contrary to the Gautrain, some traction systems in other research have two traction supply stations at both ends of the track with several APS along the way [7], hence, the need to study Gautrain as a different system from other systems around the world. The series impedances of the traction transformers and the autotransformers are of important consideration [8], although this paper only discusses the line impedances of the OHW equipment between the substations.…”

Section: Introductionmentioning

confidence: 99%

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Line Impedance Measurement to Improve Power Systems Protection of the Gautrain 25 kV Autotransformer Traction Power Supply System

Moyo¹,

Bansal

Naidoo

et al. 2019

IEEE Access

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Traction power systems are susceptible to service affecting electrical faults or disturbances. These may cause interruptions of the power supply to the trains, affecting systems operations and causing major delays. Therefore, accuracy in fault reporting and fault location is vital in the decision-making processes that will result in shorter outage periods.The evaluation and analysis of traction power protection systems has become vital to improve the system reliability and reduce outages and related costs. Line impedance measurements form an integral part of fault analysis and distance location due to the use of impedance relays in protection systems. This paper shows the importance of conducting impedance measurements in order to improve the accuracy of distance protection relays. In this paper, impedance measurements were conducted and the measured results were compared with the theoretical values. The feeder to earth, catenary to earth and feeder to catenary impedance measurements were conducted and used in the impedance calculations and analysis. The earth resistances for all line sections were also measured. Furthermore, the line impedance measurements were used for the calculation of the compensation for the earth return factor with specific application in protection settings optimisation for a traction power system. This has helped to improve the accuracy of the protection parameters. The protection settings parameters were revised as a result.

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Section: Tablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Line Impedance Measurement to Improve Power Systems Protection of the Gautrain 25 kV Autotransformer Traction Power Supply System

Moyo¹,

Bansal

Naidoo

et al. 2019

IEEE Access

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“…To formulate the problem we start from a realistic example, taken from paper [20], representing a state -of-the art AC system, normally called 2x25 kV and used by several countries, among which Japan, France, Italy, and Iran [21].…”

Section: Problem Formulationmentioning

confidence: 99%

Modeling and Simulation of AC Railway Electric Supply Lines Including Ground Return

Ceraolo

2018

IEEE Trans. Transp. Electrific.

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Today's AC railway feeding systems are composed by several conductors with various connections to each other. The return current is shared between rails, ground wires connected to rails, ground; current flows to ground are determined by rail-to-ground distributed conductance. This paper gives formulas to deal with all these complexities, both for power quality and power frequency studies, integrating and combining previous studies which cover only part of them.Especially new in this paper is a technique to include in the computation currents dispersed into soil through ballast.It also illustrates a way to implement easily all the proposed formulas using a specific, open and flexible simulation language, the Modelica language. An application of the proposed formulas and related simplifications is illustrated.

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“…All the most recent Spanish HSL [2]. Some Russian HSLs. Some Chinese HSLs. Some suburban Iranian lines [3]. All the Italian HSL's built after 1990 (e.g.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis of 2 × 25 kV railway electric supply

Barsali

Ceraolo

Lutzemberger

et al. 2020

IET Electrical Systems in Transportation

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The most common system for railway high-speed lines electric supply and the somehow de-facto standard is a special AC industrial frequency system called 2 × 25 kV system. Although several studies exist showing the performance of this system in frequency and time domains, there is a lack of studies analysing how geometric parameters influence the system behaviour, mainly in terms of conductor currents. This study first introduces a simple analytic model able to explain the fundamental feats of 2 × 25 kV systems, then evaluates the effects of critical electrical and geometrical parameters on this behaviour based on mathematical relationships and numerical computations. This simple model allows understanding the main reasons why this system is able to transmit power as a 50 kV system, while trains experience just 25 kV. Nomenclature Ra, Rb rails 2 System architecture and the proposed model The two-track geometrical arrangement of a typical 2 × 25 kV system is shown on the left part of Fig. 3, which has been drawn from Dolara et al. [7]. There are several conductors with different Fig. 1 Simplified representation of the 2 × 25 kV supply system

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Fault analysis on AC railway supply system

Cited by 8 publications

References 17 publications

Line Impedance Measurement to Improve Power Systems Protection of the Gautrain 25 kV Autotransformer Traction Power Supply System

Line Impedance Measurement to Improve Power Systems Protection of the Gautrain 25 kV Autotransformer Traction Power Supply System

Modeling and Simulation of AC Railway Electric Supply Lines Including Ground Return

Parametric analysis of 2 × 25 kV railway electric supply

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