Multi‐physics analysis and optimisation of high‐speed train pantograph–catenary systems allowing for velocity skin effect

Liu, Xianrui; Yang, Zefeng; Xiao, Song; Duan, Xuwei; Gao, Guoqiang; Wei, Wenfu; Wu, Guangning; Rotaru, Mihai; Sykulski, J.K.

doi:10.1049/hve.2019.0388

Cited by 10 publications

(5 citation statements)

References 37 publications

(33 reference statements)

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“…Some scholars also studied the current collection characteristics of carbon strip on the pantograph based on the structure of the pantograph. Liu 20 found when studying the rolling bow head that when the relative movement between the pantograph and the net occurs, the temperature of the carbon strip of the rolling bow head is also weaker than that of the traditional bow head, and when the pantograph and the net system receives the dynamic current, the temperature of the carbon strip of the rolling bow head decreases with the increase of the relative operating speed of the pantograph and the net system, while the temperature of the carbon strip of the traditional bow head increases with the increase of the relative operating speed of the pantograph and the net system; Yao, 21 in order to study the influence of the pantograph slot on the carbon strip, compared the two pantographs with a cavity and the pantographs without a cavity and found that having a closed cavity structure helps to reduce the noise of the pantograph and reduce the wear; Wang 22 explored the length of the train and found that with the increase of vehicles without pantograph, the more serious the complex turbulent zone formed by the carbon strip. From the aspects of air flow and wind direction, Tan, 23 when studying the work of the pantograph, the cylindrical rod perpendicular to the air flow direction has more obvious disturbance effect on the air flow, resulting in a larger range of vortex shedding; Wei 24 studied the arc erosion by studying the lateral wind and found that higher crosswind speed will lead to higher arc voltage, while higher input current corresponds to lower arc voltage, and more accumulated joule heat can significantly reduce the arc resistance.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on the non-uniform wear of the carbon strip of the metro pantograph

Luo,

Cai,

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present study simulated the actual contact conditions between the catenary and pantograph of a metro line using high-speed ring block current that carried friction and wear testers, from which the uneven wear of the pantograph carbon strip under different working conditions was studied. The results show that the arc power, friction coefficient, and wear amount will change correspondingly with increasing current and normal load. Additionally, all carbon strips showed non-uniform wear after the test, and the edge erosion and wear depth of the carbon strip perpendicular to the moving direction were higher than those in the middle part. The ablation of the back end of the carbon strip running with the catenary was higher than that of the front end.

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Section: Introductionmentioning

confidence: 99%

Experimental research on the non-uniform wear of the carbon strip of the metro pantograph

Luo,

Cai,

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Contact pressures that are too large or too small aggravate arc erosion or mechanical wear [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Study on Friction and Wear Properties of Copper-Impregnated Carbon Slide Plate Under Different Humidity Conditions

Huang,

Yang,

Rong

et al. 2023

Tribology Transactions

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The pantograph-catenary system is one of the most commonly used power-receiving modes of metro trains. Its friction and wear performances are related to the safety and stability of train operation. In this study, a copper-impregnated carbon slide plate material, widely used in numerous metro lines in China, is considered as the research object. The problem of abnormal wear of pantograph slide plates caused by the decrease in relative humidity in the autumn and winter in tunnels is studied. Current-carrying friction and wear tests under humidity conditions of 20%, 30%, and 40% relative humidity(RH) are performed to reveal the mechanism of seasonal abnormal wear of slide plates and provide a reference for the service of pantograph slide plates under low-humidity conditions. The results reveal that relative humidity signi cantly in uences the wear process of slide plates; further, the wear rate and friction coe cient decrease with an increase in relative humidity. As observed by electron microscopy and laser scanning confocal microscopy, with an increase in the relative humidity, the mechanical wear of the slide surface is weakened, arc erosion is enhanced, and surface roughness is increased. Scanning electron microscopy(SEM) and energy dispersive spectrometry(EDS) analysis reveal that under high humidity conditions, a relatively complete oxide lm forms on the slide plate and plays a role in lubrication and protection. Under low humidity conditions, a large number of ne abrasive particles are distributed on the surface, and an insu cient oxide lm is formed; consequently, the wear rate and friction coe cient are maintained at a high level.

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“…Power transformers are the core equipment in the power transmission systems. During the actual operation of a transformer, its oil-paper insulation system is subjected to electrical, thermal and mechanical stress, and it produces aging characteristics [1][2][3][4]. As a typical aging characteristic, furfural can be used to accurately evaluate the aging degree of the transformer insulation system [5,6].…”

Section: Introductionmentioning

confidence: 99%

Functionalised B‐Cu@F‐Ag@Au trimetallic nanomaterials with long term stability for rapid and highly sensitive in situ SERS detection of furfural in transformer oil

et al. 2022

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The surface-enhanced Raman scattering (SERS) substrates enable a highly sensitive detection of furfural in the transformer oil. However, detection substrates with long-term stability are still extremely challenging. In this work, we anchored the thiol-containing coupling agents 2, 5-dimercapto-1, 3, 4-thiadiazole (DMTD) and 1, 4-benzenedithiol (BDT) on the surface of bubble copper (B-Cu) and flower-like silver nanoparticles (F-Ag), respectively. The three-dimensional SERS detection substrates with long-term stability by using a combination of chemical reduction and self-assembly methods were constructed. The substrate has a minimum detection limit of 10 −9 M for rhodamine B in oil with an enhancement factor of up to 2.23 � 10 7 . Importantly, the three-crystal B-Cu@F-Ag 1 @Au 5 substrate was used for the detection of furfural in the transformer oil with a detection limit of 2 mg/L and a relative standard deviation value of 2.46%. After 60 days of a simulated operation, the detection signal of furfural in the transformer oil samples at 75°C and still reached the initial value of 77.53%, indicating that the substrate has a good long-term stability. This triple frame structured SERS detection platform shows great potential in tracking furfural in the aging transformer oil mixing systems. | INTRODUCTIONPower transformers are the core equipment in the power transmission systems. During the actual operation of a transformer, its oil-paper insulation system is subjected to electrical, thermal and mechanical stress, and it produces aging characteristics [1][2][3][4]. As a typical aging characteristic, furfural can be used to accurately evaluate the aging degree of the transformer insulation system [5,6]. Chromatographic based spectrophotometry and high-performance liquid chromatography are routine detection methods for furfural in the transformer oil. These methods are expensive, and they are easily affected by the surrounding environmental factors and cannot complete the detection of a complex oil system [7,8]. To achieve a nondestructive and in situ detection of furfural dissolved in oil, Toshihiro et al. applied laser Raman spectroscopy to detect the standard sample of furfural in the transformer oil for the first time, and the minimum detection limit could reach only 104 mg/L [9], which cannot meet the furfural detection accuracy standard (4 mg/L) of the transformer oil after severe aging.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Multi‐physics analysis and optimisation of high‐speed train pantograph–catenary systems allowing for velocity skin effect

Cited by 10 publications

References 37 publications

Experimental research on the non-uniform wear of the carbon strip of the metro pantograph

Experimental research on the non-uniform wear of the carbon strip of the metro pantograph

Study on Friction and Wear Properties of Copper-Impregnated Carbon Slide Plate Under Different Humidity Conditions

Functionalised B‐Cu@F‐Ag@Au trimetallic nanomaterials with long term stability for rapid and highly sensitive in situ SERS detection of furfural in transformer oil

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