Research on the wear properties of carbon strips and contact wires at frigid temperatures

Liu, Xin-long; Li, Zhihao; Hu, Ming-jie; Zhou, Chao-wei; Xiao, Qian; Yang, Wenbin; Chen, Dao-yun

doi:10.1016/j.wear.2021.204122

Cited by 11 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The performance of the slide plate material used in the pantograph directly determines the quality of the current collection. In addition, the pantograph slide is exposed to the ambient environment, so it would face mechanical impacts, arc erosion, and friction continuously during the running of trains [60][61][62]. Therefore, the design of the pantograph slide has very strict requirements which include sufficient impact resistance, high electrical conductivity, good abrasion and ablation resistance, excellent self-lubrication, and low wear property against the contact wire.…”

Section: Pantograph Slidementioning

confidence: 99%

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Dong

et al. 2022

Rail. Eng. Science

View full text Add to dashboard Cite

As the unique power entrance, the pantograph–catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train. Along with the fast development of high-speed railways all over the world, some commercialized lines are built for covering the remote places under harsh environment, especially in China; these environmental elements including wind, sand, rain, thunder, ice and snow need to be considered during the design of the pantograph–catenary system. The pantograph–catenary system includes the pantograph, the contact wire and the interface—pantograph slide. As the key component, this pantograph slide plays a critical role in reliable power transmission under dynamic condition. The fundamental material characteristics of the pantograph slide and contact wire such as electrical conductivity, impact resistance, wear resistance, etc., directly determine the sliding electrical contact performance of the pantograph–catenary system; meanwhile, different detection methods of the pantograph–catenary system are crucial for the reliability of service and maintenance. In addition, the challenges brought from extreme operational conditions are discussed, taking the Sichuan–Tibet Railway currently under construction as a special example with the high-altitude climate. The outlook for developing the ultra-high-speed train equipped with the novel pantograph–catenary system which can address the harsher operational environment is also involved. This paper has provided a comprehensive review of the high-speed railway pantograph–catenary systems, including its progress, challenges, outlooks in the history and future.

show abstract

Section: Pantograph Slidementioning

confidence: 99%

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Dong

et al. 2022

Rail. Eng. Science

View full text Add to dashboard Cite

show abstract

“…Previous studies have shown that the number of contact spots in the C-Cu contacts in the pantograph-contact line system is about 15-20, which is largely independent of the size of the nominal contact area [27]. According to Holm's electrical contact theory, assuming that all contact spots are round and have the same size, the radius of a single contact spot can be estimated by Equation (7).…”

Section: Finite Element Model Of C-cu Contacts In Pantograph-contact ...mentioning

confidence: 99%

“…In addition, the interface temperature can also reflect the characteristics of electrical contact to a certain extent. Previous research has shown that high contact pressure can reduce ECR and discharge in the C-Cu contacts [5][6][7], while high current results from a high interface temperature [8,9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Interface Temperature on the Electric Contact Characteristics of a C-Cu Sliding System

et al. 2022

View full text Add to dashboard Cite

Electrical contact resistance (ECR) and discharge are the key parameters of electrical contact performance for carbon-copper (C-Cu) contacts in the pantograph-contact line system. The change in physical and chemical properties of the C-Cu interface caused by interface temperature is the main reason for the variation in ECR and discharge. In this paper, an electric contact test platform based on interface temperature control was established. The influence of interface temperature on ECR and the discharge characteristics under different current amplitudes were studied. There are opposite trends in the change in ECR and the discharge characteristics with interface temperature under different currents, which results from the competition between interface oxidation and a softening of the contact spots caused by high temperature. The trend of interface oxidation with temperature was analyzed via the quantitative analysis of the composition and content of the oxides at the C-Cu contact interface and is discussed here. The relationship between interface oxidation, ECR, and discharge characteristics was studied. Furthermore, a finite element simulation model was established for estimating the temperature distribution throughout the C-Cu contact spots. The competitive process of the softening and oxidation of the contact spots at different temperatures and currents was analyzed, and the variation mechanism of the ECR and discharge characteristics with interface temperature was studied.

show abstract

“…Nevertheless, it is con rmed that temperature has an impact on the wear degree and current-carrying properties of tribo-pairs. The tribological characteristics of various current-carrying materials were investigated at -20°C by Liu et al [19] , but they did not con rm if the wear state of carbon strips at low temperatures differed noticeably from room temperature or if there was a temperature correlation between the tribological behavior and temperature.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Ji,

Xiao,

et al. 2024

Preprint

View full text Add to dashboard Cite

The environmental temperature alters the frictional behaviour by changing the state of the current-carrying contact interface, which makes the electrical contact invalid. In this work, the effects of three different temperatures (-20 ℃, 0, 20 ℃) on the current-carrying tribological behaviour of C-Cu tribo-pairs in high humidity environment (85%) were discussed. The evolution laws of friction coefficient, wear volume, contact surface properties, and contact resistance of C-Cu contact pairs under the coupling effect of temperature and current were studied, and the current- carrying wear mechanism of C-Cu at low temperature was analyzed in depth. The friction coefficient at each temperature exhibits a similar changing rule before and after current-carrying, demonstrating that the friction coefficient increases as temperature falls. However, the average friction coefficient at each temperature is lower than that without current. Although it will hasten the material surface's oxidation, a drop in ambient temperature will effectively lessen the transfer behavior of copper to carbon surface and reduce the wear volume of carbon material. The amount of copper transferred increases as current rises. Compared with the current, the change of temperature has a greater impact on the damage of tribo-pairs. At room temperature, the contact resistance under high current is greater than that of low current, the low temperature is just the opposite. In addition, at 0℃, although the contact resistance of low current (5 A) decreases significantly in the early stage of friction, its average resistance and fluctuation amplitude are the largest. As the temperature decreases, the current-carrying wear mechanism of C-Cu contact pairs gradually changes from adhesive wear to fatigue wear.

show abstract

Research on the wear properties of carbon strips and contact wires at frigid temperatures

Cited by 11 publications

References 26 publications

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Influence of Interface Temperature on the Electric Contact Characteristics of a C-Cu Sliding System

The effect of temperature on the current-carrying tribological behevior of C/Cu contact pairs in high humidity environments

Contact Info

Product

Resources

About