Analysis of Traction Reflux Characteristics of EMU and Improvement of Its Protective Grounding System

Li, Woyang; Zhou, Lijun; Chen, Tiandong; Zhou, Meng; Zhang, Guinan; Wang, Dongyang; Guo, Lan-Ping

doi:10.1109/tte.2022.3147836

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…Combining ( 11) and ( 12), it can be concluded that the natural frequency of the fault traveling wave obtained at the traction power supply station A is the root of the characteristic equation as (13).…”

Section: Mechanisms For the Generation Of Faulty Traveling Wave Spectramentioning

confidence: 93%

“…In Figure 13, the maximum range error is 10 m when a low resistance earth fault occurs, with relatively little change in the FIGURE 13 Error distribution at different transition resistances at different fault points range error as the fault location changes. When a high resistance earth fault occurs, the maximum range error is 16.94 m, which is greater than the range error caused by a direct earth fault.…”

Section: Effect Of Transition Resistance On the Measurement Errormentioning

confidence: 99%

“…The ground leakage protection system mainly uses 64D protection devices. For the problem of 64D misoperation, Li et al [13] proposed to change the overvoltage protection to high current protection, and the protection action current value is set to 6000A, which can narrow the accident range and achieve trip selectivity. However, at this time the 64D becomes a single conductor device, requiring a device with a very high resistance to flow.…”

Section: Introductionmentioning

confidence: 99%

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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.

show abstract

Section: Mechanisms For the Generation Of Faulty Traveling Wave Spectramentioning

confidence: 93%

Section: Effect Of Transition Resistance On the Measurement Errormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…Combining (11) and ( 12), it can be concluded that the natural frequency of the fault traveling wave obtained at the traction power supply station A is the root of the characteristic equation as (13).…”

Section: Figure 8 Davinan Equivalent Circuit For Traction Power Suppl...mentioning

confidence: 99%

“…The ground leakage protection system mainly uses 64D protection devices. For the problem of 64D misoperation, Woyang Li et al [13] proposed to change the overvoltage protection to high current protection, and the protection action current value is set to 6000A, which can narrow the accident range and achieve trip selectivity. However, at this point the 64D becomes a single conductor device, requiring a device with a very high resistance to flow.…”

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

Preprint

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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, which in turn makes it difficult for the protection 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. The first step is to determine whether an earth fault has occurred by analysing the difference in current between the positive and negative busbars. Secondly, 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 20m. 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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Thermodynamic Property Improvement of Silicone Rubber for Traction Transformer Based on Molecular Simulation

Chen,

He,

2023

2023 13th International Conference on Power and Energy Systems (ICPES)

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Analysis of Traction Reflux Characteristics of EMU and Improvement of Its Protective Grounding System

Cited by 4 publications

References 22 publications

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

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

Protection Method of Traction Power Supply System for Low and Medium Speed Maglev Traffic Based on Fault Traveling Wave Features

Thermodynamic Property Improvement of Silicone Rubber for Traction Transformer Based on Molecular Simulation

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