Automatic fault location and isolation system for the electric traction overhead lines

Agarwal, K.

doi:10.1109/rrcon.2002.1000103

Cited by 13 publications

(8 citation statements)

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“…Once the subsection is isolated through its corresponding motor-driven disconnectors, the rest of the subsections without a ground fault are powered again. In the case of a lack of accuracy in the determination of the distance to the ground fault, a subsection which is closer to or farther away from the real distance to the fault may remain without power supply for an unacceptable time [19].…”

Section: Ground Fault Location In 2 × 25 Kv Power Systems: Descriptiomentioning

confidence: 99%

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

et al. 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.

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Section: Ground Fault Location In 2 × 25 Kv Power Systems: Descriptiomentioning

confidence: 99%

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

et al. 2015

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“…Following this procedure, a ground fault can be located by measuring the impedance in each conductor and return cable circuits. This method is used in some 2 × 25 kV traction power systems, but it is very slow, requiring several operations of connection and disconnection of switches with waiting times between each maneuver [8,9].…”

Section: Introductionmentioning

confidence: 99%

A New Method of Ground Fault Location in 2 × 25 kV Railway Power Supply Systems

et al. 2017

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Abstract:Owing to the installation of autotransformers at regular intervals along the line, distance protection relays cannot be used with the aim of locating ground faults in 2 × 25 kV railway power supply systems. The reason is that the ratio between impedance and distance to the fault point is not linear in these electrification systems, unlike in 1 × 25 kV power systems. Therefore, the location of ground faults represents a complicated task in 2 × 25 kV railway power supply systems. Various methods have been used to localize the ground fault position in 2 × 25 kV systems. The method described here allows the location of a ground fault to be economically found in an accurate way in real time, using the modules of the circulating currents in different autotransformers when the ground fault occurs. This method first needs to know the subsection and the conductor (catenary or feeder) with the defect, then localizes the ground fault's position.

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“…Accompanied by the improvement of the traction networks, their operational status plays an important role in the stability and security of railway control. Therefore, the fault has to be located and eliminated immediately once a fault occurs, so as to restore normal power supply and operation [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Fault Location with Frequency Domain for Power Traction System

Zhou

Chen

2013

Energies

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In this paper, precise fault location in electrical traction network systems is discussed in the high-frequency domain. Based on the analysis of the equivalent impedance at the measurement terminal, the relationship between the fault distance and the frequency spectrum extreme points of the system impedance are derived. The exact fault location can be obtained from the relationship curves accordingly. MATLAB simulation experiments have been performed to verify the effectiveness of the proposed algorithm

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Automatic fault location and isolation system for the electric traction overhead lines

Cited by 13 publications

References 0 publications

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

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

A New Method of Ground Fault Location in 2 × 25 kV Railway Power Supply Systems

Model-Based Fault Location with Frequency Domain for Power Traction System

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