Ground Fault Location in 2 × 25 kV High-Speed Train Power Systems by (Auto)Transformers Currents Ratio

Platero, Carlos A.; Serrano, Jesús; Sánchez‐Palencia, Yolanda; Fernandez-Horcajuelo, Alba

doi:10.1109/tpwrd.2020.3032792

Cited by 11 publications

(8 citation statements)

References 37 publications

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“…Due to the operating voltage limitation, onboard under-voltage protection systems may disconnect the train from the network in the event of a ground fault. Therefore, conventional location methods do not take into account the impact of train current, assuming it is negligible [11][12][13][14][15][16][17][18]. In [11] and [12], a location method based on the ratios of AT neutral current was proposed, which assumes that the train current is much smaller than the short-circuit current and that the traininduced location error is acceptable.…”

Section: Introductionmentioning

confidence: 99%

“…Another location method, presented in [13] and [14], determined the fault location based on the ratio of current at the neutral of AT, deriving three new functions for different sections. In [15], the variations of fault currents at the AT windings with fault distance were calculated, and a fault-location algorithm utilizing a look-up table was proposed [16]. Furthermore, a fault-location method based on fault conductor currents was reported in [17] and [18], which is suitable for the specific structure of the traction network.…”

Section: Introductionmentioning

confidence: 99%

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Ground fault identification and location of autotransformer traction network for high‐speed railway based on multi‐terminals synchronous measure information

Wang,

Li,

Han

et al. 2023

IET Generation Trans & Dist

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With the rapid development of high‐speed railway, the auto‐transformer traction network (ATN) is also expanding. However, due to the improved performance of electric multiple units (EMUs) and the non‐linear relationship between impedance and ground fault distance, distance protection has limited coverage and cannot accurately locate the fault distance by measuring impedance. This paper presents a model of the ATN considering the presence of EMUs, which effectively demonstrates the characteristics of current distribution under the ground faults. Furthermore, a ground fault identification method based on multi‐terminal currents is proposed to enhance the accuracy of fault identification and differentiate faults and EMUs. The mapping relationship between current distribution and fault location is derived, and an accurate fault location method is proposed. Compared to existing methods, this method is not affected by EMUs and AT parameters. The fault identification and location scheme for ATN employs multi‐terminal synchronous information. Finally, through simulation and experimental setups, case studies have been conducted to verify the accuracy and robustness of the proposed method in various fault scenarios. Certainly, this research has significant application prospects in fault analysis and detection for HSR.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ground fault identification and location of autotransformer traction network for high‐speed railway based on multi‐terminals synchronous measure information

Wang,

Li,

Han

et al. 2023

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…The fault analysis method, which is mainly used in traction power supply systems, is a method of analysing and calculating the relevant parameters of the system and the electrical quantities at the measurement points, and thus finding the fault distance [15]. Platero et al [16] proposes an improved impedance ranging method based on the traditional line current relationship between the two ends considering the effect of high and low voltage at both ends. Bendjabeura et al [17] proposes a double-ended asynchronous ranging method based on solving differential equations.…”

Section: Introductionmentioning

confidence: 99%

“…Platero et al. [16] proposes an improved impedance ranging method based on the traditional line current relationship between the two ends considering the effect of high and low voltage at both ends. Bendjabeura et al.…”

Section: Introductionmentioning

confidence: 99%

Protection method of traction power supply system for low and medium speed Maglev traffic based on fault traveling wave features

Yan,

Wang,

2023

IET Generation Trans & Dist

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Low and medium speed magnetic levitation traffic with short power supply distance and complex grounding network structure, prone to power supply rail grounding faults. However, the existing fault location methods do not accurately locate the fault point, making it difficult for the protective device to act to cut off the fault. To address the above problems, this paper builds a dynamic simulation model of the low and medium speed magnetic levitation power supply rails to study the distribution characteristics of the fault traveling waves after a ground fault occurs in the power supply rails, and analyses the generation mechanism of the traveling wave spectrum through formula calculation. First, the difference in current between the positive and negative bus bars is analyzed to determine whether a ground fault has occurred. Second, the direction of the current difference between stations is compared to locate the faulty section. Finally, the fault distance is calculated from the frequency difference of the fault voltage at the double‐ended station. Through simulation, the method is validated to be unaffected by fault location, fault transition resistance, noise interference, and is applicable to short circuit faults caused by lightning strikes, and the ranging error always remains within 20 m. The method has strong robustness, can effectively solve the problem of protection misoperation and accurately locate the fault point. It is suitable for low and medium speed magnetic levitation transportation power supply rail ground fault.

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“…Therefore, in Ref. [16], Serrano improved the above method by replacing currents of ATs with the ratio of currents of ATs and substation transformer. However, this method is also based on the fault current distributions when a ground fault occurs, which is familiar with the traditional AT neutral current ratio method.…”

Section: Introductionmentioning

confidence: 99%

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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Ground Fault Location in 2 × 25 kV High-Speed Train Power Systems by (Auto)Transformers Currents Ratio

Cited by 11 publications

References 37 publications

Ground fault identification and location of autotransformer traction network for high‐speed railway based on multi‐terminals synchronous measure information

Ground fault identification and location of autotransformer traction network for high‐speed railway based on multi‐terminals synchronous measure information

Protection method of traction power supply system for low and medium speed Maglev traffic based on fault traveling wave features

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

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