Fault Current Detection and Dangerous Voltages in DC Urban Rail Traction Systems

Pons, Enrico; Tommasini, Riccardo; Colella, Pietro

doi:10.1109/tia.2017.2692202

Cited by 25 publications

(7 citation statements)

References 14 publications

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“…These systemic changes and the resulting challenges underscore the pressing need for more sophisticated and responsive protection mechanisms [2]. Such a mechanism must not only accommodate the complex dynamics of an expanding railway network, but also ensure the unerring detection and isolation of faults, thereby safeguarding the continuous operation and integrity of the traction system.…”

Section: A Backgroundmentioning

confidence: 99%

Adaptive DDL Algorithm to Elucidate the Protection Misoperation in Malaysian Rapid Rail DC Traction System

Kumar,

Othman,

Wahab

et al. 2024

IEEE Access

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In modern railway traffic systems, direct current (DC) electrification is a prevalent choice, with numerous traction networks adopting a variety of voltage levels to accommodate varying load current dynamics. These dynamics are influenced by passenger density, aggregate demand for electrical power, headways, and frequency of locomotive operations. Load currents are prone to surges during periods of dense traffic and transient phases such as acceleration, deceleration, and the start-stop sequences of trains. Such surges hold the potential to precipitate fault currents within the traction system, which are similar to those engendered by external anomalies. Conventional protection systems, such as the Détection Défaut Ligne'-French for 'Line Fault Detection), may not always effectively identify remote faults or prolonged overcurrent situations. These scenarios necessitate an advancement beyond the traditional fault detection methodologies, which are primarily reliant on fixed thresholds and may not account for the dynamic nature of the railway system's electrical load. This paper addresses the limitations inherent in the existing DDL protection mechanisms by focusing on the feeder attributes specific to the DC Traction System. In pursuit of this objective, we introduce an innovative adaptive current DDL algorithm to refine the rigid threshold paradigm inherent in the conventional approach. To facilitate a pragmatic assessment, the Rapid Rail network of Malaysia serves as a reference for emulating the railway's electrical system. This comprehensive analysis yields insights that are potentially useful for safety protocols in DC electrified railroad traffic systems

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Section: A Backgroundmentioning

confidence: 99%

Adaptive DDL Algorithm to Elucidate the Protection Misoperation in Malaysian Rapid Rail DC Traction System

Kumar,

Othman,

Wahab

et al. 2024

IEEE Access

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“…Similarly, standard limits and requirements may be misinterpreted, in an exaggeratedly precautionary perspective. Traction fault current is part of earthing network design and selection of protections [10] [11]. Track voltage information instead can be derived during design from traction power simulations, with various levels accuracy for line exploitation, train performance, dynamic power allocation and traction power stations (TPSs) outages [12] [13].…”

Section: Introductionmentioning

confidence: 99%

Electrical Safety and Stray Current Protection With Platform Screen Doors in DC Rapid Transit

Mariscotti

2021

IEEE Trans. Transp. Electrific.

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Modern transit system are equipped with platform screen doors (PSDs) that represent a new element introduced in the electrical safety and stray current protection scenarios. Passengers may interact with PSDs and platform while boarding, leaving and waiting trains. Typical contractual requirements and applicable standards are discussed, identifying touch voltage scenarios suitably defining electrical circuits and parameters. DC voltage limits are at all clear and unambiguous in the range of relevant touch voltage values. The evaluation of exposure is thus carried out with the help of body impedance and body current models. Solutions are then discussed for protection of PSDs and passengers, including stray current limitation as constraint. A novel PSD bonding arrangement is proposed that reconciles insulation for utmost electrical safety level and bonding for traction fault protection.

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“…The increase rate and the steady value of the short circuit current is large when the fault occurs near the traction power substation. The change of the short circuit current is relatively slow when the fault occurs along the line and far away from the traction power substation, due to the effect of the line inductance and resistance [13]. Many fault diagnosis methods based on current analysis have been proposed in previous studies, such as DDL protection method [14][15].…”

Section: Introductionmentioning

confidence: 99%

Temporal Fluctuated Features of Metro Traction Load Current in DC Railway

et al. 2020

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24-hour traction current based on Wuhan Metro Line 6 are reported. The fluctuation features, which corresponding to the interval of vehicle operation, indicate that there are four types of inrush current periodically appearing throughout the all-day waveforms. The first type consists of two positive sharp waves. The second type is saddle shaped, and consists of two positive peaks and an anti-peak. The third type consists of two double peaks followed by a sharp peak about 1 minute later. The fourth type consists of two hump shaped waveforms. The whole operation time can be divided into the peak and off-peak hours according to these repetitive segments. The interval of any two adjacent vehicles is 9 minutes and 11 minutes, respectively, in peak and off-peak hours. The distribution and the positive average value of feeder current per hour from 6:00-24:00 are counted and analyzed. Results show that the current distribution in off-peak hours is more concentrated in a narrower range than that in peak hours. The differences in averages between various 15-minute periods in an hour can be as high as tens of amperes, due to the occurrence time of repetitive segments. The rail potential has relatively consistent variation with feeder currents, but it matched best with the sum of up-line and down-line in a same section instead of one of the two lines.

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Fault Current Detection and Dangerous Voltages in DC Urban Rail Traction Systems

Cited by 25 publications

References 14 publications

Adaptive DDL Algorithm to Elucidate the Protection Misoperation in Malaysian Rapid Rail DC Traction System

Adaptive DDL Algorithm to Elucidate the Protection Misoperation in Malaysian Rapid Rail DC Traction System

Electrical Safety and Stray Current Protection With Platform Screen Doors in DC Rapid Transit

Temporal Fluctuated Features of Metro Traction Load Current in DC Railway

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