Experimental study on the temperature of the contact strip in sliding electric contact

Chen, GX; Hu, Yi; Bj, Dong; Yang, Hang; Gao, GQ; Wu, GN; Wh, Zhang; Zhou, Zhengchun

doi:10.1177/1350650117692482

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…Likewise, the peeling carbon sheets worn by mechanical wear and electric current are more likely to reverse transfer to the Cu wear track as wear progresses. There are no obvious arc ablation pits and crackled oxide films as in other studies [31,32] observed on the worn surface, probably attribute to the insufficient current applied in this research.…”

Section: Wear Mechanisms Of the Carbon/cu Tribo-pairsupporting

confidence: 41%

The role of relatively humidity in friction and wear behaviors of carbon sliding against copper with electric current

Ji¹,

Li²,

Shen³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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During the train operation, the pantograph/catenary system is subjected to an extremely harsh service environment. Relative humidity has a great influence on the current-carrying tribological behaviors of carbon strips. The identification and understanding of the wear mechanism are extremely important in wet and dry conditions. This study was carried out to investigate the humidity effect on the service properties of carbon sample rubbing against copper (Cu) with and without electric current using a home-made wear tester, and the humidity ranging from 10% RH to 80% RH. The results indicate that the sliding wear behavior of the friction interface is drastically affected by the intervention of water vapor and electric current. The coefficient of friction (COF) without current is obviously lower than current-carrying sliding when the humidity is constant. However, the increased humidity led to a decreasing trend. After the current increases to 10 A, all the COF values are closed to each other ultimately. These phenomena mainly result from the formation and destruction of water lubrication film. Furthermore, the tribo-pairs worn surface appears the most sensitive to the current effect under dry conditions. The reverse transfer of Cu and carbon is greater on account of the current agglomeration effect, and the oxidation degree is more severe. The wear mechanisms of carbon are mainly material transfer accompanying with oxidation erosion. However, the wear degradation is weakened under water lubrication and uniform current distribution which improves the conductive quality. This is the coupling effect of humidity environment, current and heat concentration. This experiment provides technical support for the operation of an electric locomotive under an extremely harsh service environment.

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Section: Wear Mechanisms Of the Carbon/cu Tribo-pairsupporting

confidence: 41%

The role of relatively humidity in friction and wear behaviors of carbon sliding against copper with electric current

Ji¹,

Li²,

Shen³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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“…The impact of slip speed on the energy of the arc discharges is shown in the Figure 11. Furthermore, in publication [31] it was found that the discharge energy E1 = 2.149e 5 for the velocity v = 150 km/h, E2 = 1.681e 5 for the velocity v = 100 km/h, and E3 = 1.225e 5 for the velocity v = 50 km/h. The ratio of arc discharge energy is equal E1/E2 = 1.30 and for E1/E3 = 1.79.…”

Section: Discussionmentioning

confidence: 99%

Damages of the Section Insulator Guide Caused by Electric Arc

Konieczny,

Labisz

2024

Adv. Sci. Technol. Res. J.

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This article presents research on the influence of an electric arc on the properties and structure of a traction section guide made of ETP (electrolytic tough pitch) copper in a segment insulator of a railway section. An electrical discharge occurring during use, which may accompany the passage of the pantograph current collector between adjacent guides, may cause many physical phenomena. In addition to existing guide wear mechanisms, such as friction, corrosion, and/or oxidation, the action of an electric arc also has a devastating effect on the guide in use, causing its complete destruction in extreme cases. The aim of the investigation was to determine what type of damage to the sectional guide in real operation conditions was caused by the impact of an electric arc that is induced when the pantograph passes from one guide to the adjacent one. The paper presents the results of tests on an operational guide made of hard electrolytic copper Cu-ETP, in particular the results of microscopic observations, the results of microscopic tests obtained using the ZEISS SUPRA 25 scanning electron microscope, as well as the analysis of the chemical composition in micro-areas (EDS -Energy-dispersive X-ray spectroscopy). On the basis of the tests carried out, it was found that the dominant destructive mechanism of the guide is the electric arc, the presence of elements from the external environment was also determined, and the degree of damage was analysed depending on the conditions and operating times.

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“…Taking the sliding between the C-Cu electrical sliding contacts in the railway pantograph-contact line system as an example, the research was carried out on the tester, as shown in Figure 1 [16,17]. The experimental device is composed of a moving part, an electric power supply part, and a load-applying part.…”

Section: Experimental Devicementioning

confidence: 99%

“…The electric power supply part can provide 0-800 A adjustable AC/DC current for the contact pair, while the load-applying part can provide 0-300 N adjustable loads for the contact pair. Figure 2 shows the data acquisition and temperature control system [16,17]. Hall voltage and current sensors are used to collect contact voltage drop and the loop current of the C-Cu contacts with ranges of 0-500 V and 0-800 A, respectively, and the frequency response is 0-100 kHz.…”

Section: Experimental Devicementioning

confidence: 99%

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

et al. 2022

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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.

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Experimental study on the temperature of the contact strip in sliding electric contact

Cited by 15 publications

References 22 publications

The role of relatively humidity in friction and wear behaviors of carbon sliding against copper with electric current

The role of relatively humidity in friction and wear behaviors of carbon sliding against copper with electric current

Damages of the Section Insulator Guide Caused by Electric Arc

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

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