What are the Progresses and Challenges, from the Electrical Properties of Current-Carrying Friction System to Tribological Performance, for a Stable Current-Carrying Interface?

Fu, Yang; Qin, Hongling; Xu, Xipeng; Zhang, Xiaolong; Guo, Zhiguang

doi:10.1007/s40735-021-00516-5

Cited by 6 publications

(2 citation statements)

References 151 publications

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“…In the eld of PT, a large number of researches have been carried out and many practical application results were obtained and provided much valuable information for the design of electricity transmission engineering [7]. Different from PT, the ST does not have the problem of resistance heat or arcing corrosion, but any slight changes in the contact interface will have a signi cant impact on signal integrity [3].…”

Section: Introductionmentioning

confidence: 99%

The effect of friction and wear behavior on the signal transmission of brush-ring system during electrical contact sliding

Yuan

Song

et al. 2022

Preprint

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Copper-graphite brush and slip-ring systems are often used to transmit electrical energy and signal between moving and stationary parts. At present, the research on the brush-ring system mainly focuses on power transmission, while on signal transmission is relatively lesser. In this study, the effects of friction and wear behavior on signal waveform distortion were in-situ analyzed using a custom-designed tribotester, which can specially synchronize the slip-ring rotation period with the input signal waveform. Results were analyzed comprehensively from tribological and electrical aspects to find out the key factors, including friction coefficient, friction temperature, contact resistance, surface morphology, roughness, wear particles, and compositions. It was found that the distortion of signal waveform is mainly affected by the friction film. During the sliding electrical contact motion, the increase of friction film will increase the contact resistance, which in turn increases the signal waveform distortion. At the same time, under the normal load and shear force, the friction film moves along the sliding direction, hence causing the signal phase angle to shift. From a tribological point of view, the friction coefficient and temperature decrease with increasing the friction film. So, for the brush-ring system, the formation of friction film is good for the friction stability but bad for signal transmission.

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Section: Introductionmentioning

confidence: 99%

The effect of friction and wear behavior on the signal transmission of brush-ring system during electrical contact sliding

Yuan

Song

et al. 2022

Preprint

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“…The carbon brush/slip ring system in the hydro generator is a typical current-carrying friction system [1] . It operates as a sliding friction pair under high-speed, high-current, and low contact pressure conditions.…”

mentioning

confidence: 99%

Research on current-carrying frictional discharge phenomena in the sliding contact of carbon brushes and collector rings

Li,

Zhao,

Xiao

et al. 2024

International Conference on Mechatronic Engineering and Artificial Intelligence (MEAI 2023)

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As a collector ring material, carbon steel is widely used in domestic active hydraulic generators and high-speed current-carrying friction systems. However, during operation, the carbon brush/collector ring friction pair may lose contact due to the rotor's eccentric vibration, leading to electric sparks or ring fires at the contact interface. These occurrences result in mechanical wear and electrical corrosion, seriously endangering the normal operation of the unit. To clarify the underlying mechanism, this study investigated the evolution of electric spark strength at the interface of D172 carbon brushes and 45# steel, as well as the change in the surface ablation degree of 45# steel under various conditions of load, speed, and polarity. The results demonstrate that under the same load, the relative strength and discharge characteristics of electric sparks are influenced by polarity and rotation speed. Specifically, the arcing rate, maximum relative strength, average relative strength, and maximum duration of electric sparks exhibit positive correlations with rotation speed. As the rotating speed increases, the electric spark of carbon brushes connected to the positive pole gradually transitions from multiple points/columns to strips. On the other hand, the electric spark of carbon brushes connected to the negative pole gradually evolves into spherical/ellipsoidal shapes and shows splashing effects with the increasing rotating speed. Additionally, the degree of surface ablation increases with the velocity, and the ablation is greater in the case of carbon brushes connected to the negative pole compared to those connected to the positive pole.

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Current-carrying tribological behavior of C/Cu contact pairs in extreme temperature and humidity environments for railway catenary systems

Shen,

Ji,

et al. 2024

Sci. China Technol. Sci.

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What are the Progresses and Challenges, from the Electrical Properties of Current-Carrying Friction System to Tribological Performance, for a Stable Current-Carrying Interface?

Cited by 6 publications

References 151 publications

The effect of friction and wear behavior on the signal transmission of brush-ring system during electrical contact sliding

The effect of friction and wear behavior on the signal transmission of brush-ring system during electrical contact sliding

Research on current-carrying frictional discharge phenomena in the sliding contact of carbon brushes and collector rings

Current-carrying tribological behavior of C/Cu contact pairs in extreme temperature and humidity environments for railway catenary systems

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