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

Serrano, Jesús; Platero, Carlos A.; López-Toledo, Máximo; Granizo, Ricardo

doi:10.3390/en10030340

Cited by 10 publications

(9 citation statements)

References 15 publications

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“…The modal voltage transformed by the phase-modal transformation matrix in Equation (27) can be regarded as the voltage in an independent two-conductor modal circuit formed by two phase lines. If two faulty phase lines are applied to form the air modal circuit, the voltage of the fault point will be the minimum.…”

Section: Fault Location Of Phase-to-phase Faultmentioning

confidence: 99%

Voltage Distribution–Based Fault Location for Half-Wavelength Transmission Line with Large-Scale Wind Power Integration in China

et al. 2018

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Large-scale wind farms are generally far away from load centers, hence there is an urgent need for a large-capacity power transmission scheme for extremely long distances, such as half-wavelength transmission lines (HWTLs), which can usually span thousands of kilometers from large-scale wind farms to load centers. An accurate fault location method for HWTLs is needed to ensure safe and reliable operation. This paper presents the design of a modal voltage distribution-based asynchronous double-end fault location (MVD-ADFL) scheme, in which the phase voltages and currents are transformed to modal components through a Karenbauer transformation matrix. Then, the modal voltage distributions along transmission lines are calculated by voltage and current from double ends. Moreover, the minimums and intersection points of calculated modal voltages from double ends are defined as the fault location estimation. In order to identify incorrect fault location results and reduce calculation errors for the correct ones, air modal and earth modal voltage distributions are applied in the fault location estimations. Simulation results verify the effectiveness of the proposed approach under different fault resistances, distances, and types. Lastly, a real-time digital simulator (RTDS)-based hardware-in-the-loop (HIL) test is undertaken to validate the feasibility of implementing the proposed approach.

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Section: Fault Location Of Phase-to-phase Faultmentioning

confidence: 99%

Voltage Distribution–Based Fault Location for Half-Wavelength Transmission Line with Large-Scale Wind Power Integration in China

et al. 2018

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“…Finally, the fault locator is founded on a previous calculation of the currents in the autotransformers in case of a ground fault at all positions of a section [16].…”

Section: Fault Locatormentioning

confidence: 99%

“…The aim of this article is to analyse the influence of the train circulation and arc resistance on the new ground fault location method presented in [16].…”

Section: Influence Of High-speed Train Power Demand and Fault Resistamentioning

confidence: 99%

“…A novel method of identifying the subsection between autotransformers where the ground fault has happened and identifying the faulty conductor was presented in [15]. This identification method, combined with an analysis of the currents in the autotransformers, allowed the location method presented in [16] to be developed.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the influence of high-speed train currents and arc resistances is analysed to evaluate the error in the location method presented in [16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of High-Speed Train Power Consumption and Arc Fault Resistances on a Novel Ground Fault Location Method for 2 × 25 kV Railway Power Supply Systems

et al. 2018

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The 2 × 25 kV power supply system is the most frequently used traction rail system to provide the huge power needed by high-speed trains. However, locating the ground fault in this power supply system is more complicated than in other configurations of electrical railway power supply due to the installation of autotransformers throughout the line section. In previous papers, the authors have described a ground fault location method with an insignificant installation cost. The method and, moreover, the location discriminate between whether the ground fault is located between a positive conductor and ground or a negative conductor and ground. The current of the high-speed train influences the accuracy of the location of the ground fault. An additional factor which influences the location method is the existence of an arc resistance between the positive or negative conductor and ground. In this paper, the influence of high-speed train currents and arc resistances are analysed to evaluate the error in the location method. The major conclusion of the paper is that the location method has an acceptable precision even taking into consideration the high-speed train current and arc resistance. The validation of the method has been performed by laboratory tests and computer simulations with satisfactory results.

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Improved fault location method for AT traction power network based on EMU load test

Lin

Quan

et al. 2022

Rail. Eng. Science

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The autotransformer (AT) neutral current ratio method is widely used for fault location in the AT traction power network. With the development of high-speed electrified railways, a large number of data show that the relation between the AT neutral current ratio and the distance from the beginning of the fault AT section to the fault point (Q–L relation) is mostly nonlinear. Therefore, the linear Q–L relation in the traditional fault location method always leads to large errors. To solve this problem, a large number of load-related current data that can be used to describe the Q–L relation are obtained through the load test of the electric multiple unit (EMU). Thus, an improved fault location method based on the back propagation (BP) neural network is proposed in this paper. On this basis, a comparison between the improved method and the traditional method shows that the maximum absolute error and the average absolute error of the improved method are 0.651 km and 0.334 km lower than those of the traditional method, respectively, which demonstrates that the improved method can effectively eliminate the influence of nonlinear factors and greatly improve the accuracy of fault location for the AT traction power network. Finally, combined with a short-circuit test, the accuracy of the improved method is verified.

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

Cited by 10 publications

References 15 publications

Voltage Distribution–Based Fault Location for Half-Wavelength Transmission Line with Large-Scale Wind Power Integration in China

Voltage Distribution–Based Fault Location for Half-Wavelength Transmission Line with Large-Scale Wind Power Integration in China

Influence of High-Speed Train Power Consumption and Arc Fault Resistances on a Novel Ground Fault Location Method for 2 × 25 kV Railway Power Supply Systems

Improved fault location method for AT traction power network based on EMU load test

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