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A study on the detachment characteristics of the tramwave catenary-free electrification system for urban traffic

A study on the detachment characteristics of the tramwave catenary-free electrification system for urban traffic
A study on the detachment characteristics of the tramwave catenary-free electrification system for urban traffic
The tramwave catenary-free system (TCS)—a novel type of electrified transit system for urban railways—receives traction energy from a flexible ground-embedded ferromagnetic strip, which is energized only if a corresponding segment is located underneath the vehicle body. The current collector in the TCS is equipped with an “I-shaped” permanent magnet combination that produces a lifting force on the flexible ferromagnetic strips with octopus-shaped copper sheets located on the surface of the strips underneath the ground. The vehicle’s high-voltage circuit conducts when an electrical contact is maintained by the attractive force of the permanent magnet combination mounted inside the magnetic current collector. However, it has recently been observed that due to the dynamic processes during the electrical contact a severe electrochemical corrosion may occur on the surface of the octopus-shaped copper sheets, which can jeopardize the safe operation of the whole electrified transit system of trams. In order to identify the origins of this electrochemical corrosion, the dynamic characteristics of the TCS have been evaluated with particular attention paid to the impact of eddy currents on the attractive force of the permanent magnet combination under variable operational velocities of vehicles. Based on the dynamic characteristics of TCS, the arc erosion process on the surface of the copper sheet has been reproduced using an arc-discharge experimental platform and the causes of electrochemical corrosion in the TCS have been found. The damage development trends—under increasing speeds of trams—evaluated by the dynamic model of the TCS are consistent with the statistical data for practical damage situations.
Dynamic characteristics, electrical contact, electrified transit system, electrochemical corrosion, permanent magnet current collector, tramwave catenary-free system (TCS)
0093-3813
3670-3678
Xiao, Song
6ffa9657-513e-4b86-86a2-e560d3c09c72
Zhang, Can
d248e399-21ab-4bfb-bc48-3373f0775d15
Luo, Yuanpei
8bf37e8e-3ee3-4337-97df-9350b1791505
Wu, Jingchi
b3bb15fe-d2ab-4c82-9f97-1d5fbc150e1e
Rao, Yang
0dd9723b-9182-4896-acf2-6eb1b197e51e
Sykulski, Jan K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb
Xiao, Song
6ffa9657-513e-4b86-86a2-e560d3c09c72
Zhang, Can
d248e399-21ab-4bfb-bc48-3373f0775d15
Luo, Yuanpei
8bf37e8e-3ee3-4337-97df-9350b1791505
Wu, Jingchi
b3bb15fe-d2ab-4c82-9f97-1d5fbc150e1e
Rao, Yang
0dd9723b-9182-4896-acf2-6eb1b197e51e
Sykulski, Jan K.
d6885caf-aaed-4d12-9ef3-46c4c3bbd7fb

Xiao, Song, Zhang, Can, Luo, Yuanpei, Wu, Jingchi, Rao, Yang and Sykulski, Jan K. (2020) A study on the detachment characteristics of the tramwave catenary-free electrification system for urban traffic. IEEE Transactions on Plasma Science, 48 (10), 3670-3678, [9211525]. (doi:10.1109/TPS.2020.3025323).

Record type: Article

Abstract

The tramwave catenary-free system (TCS)—a novel type of electrified transit system for urban railways—receives traction energy from a flexible ground-embedded ferromagnetic strip, which is energized only if a corresponding segment is located underneath the vehicle body. The current collector in the TCS is equipped with an “I-shaped” permanent magnet combination that produces a lifting force on the flexible ferromagnetic strips with octopus-shaped copper sheets located on the surface of the strips underneath the ground. The vehicle’s high-voltage circuit conducts when an electrical contact is maintained by the attractive force of the permanent magnet combination mounted inside the magnetic current collector. However, it has recently been observed that due to the dynamic processes during the electrical contact a severe electrochemical corrosion may occur on the surface of the octopus-shaped copper sheets, which can jeopardize the safe operation of the whole electrified transit system of trams. In order to identify the origins of this electrochemical corrosion, the dynamic characteristics of the TCS have been evaluated with particular attention paid to the impact of eddy currents on the attractive force of the permanent magnet combination under variable operational velocities of vehicles. Based on the dynamic characteristics of TCS, the arc erosion process on the surface of the copper sheet has been reproduced using an arc-discharge experimental platform and the causes of electrochemical corrosion in the TCS have been found. The damage development trends—under increasing speeds of trams—evaluated by the dynamic model of the TCS are consistent with the statistical data for practical damage situations.

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e-pub ahead of print date: 2 October 2020
Published date: October 2020
Keywords: Dynamic characteristics, electrical contact, electrified transit system, electrochemical corrosion, permanent magnet current collector, tramwave catenary-free system (TCS)

Identifiers

Local EPrints ID: 445305
URI: http://eprints.soton.ac.uk/id/eprint/445305
ISSN: 0093-3813
PURE UUID: 82b86dba-c8df-46b7-bc07-aa9475f4c5d0
ORCID for Jan K. Sykulski: ORCID iD orcid.org/0000-0001-6392-126X

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Date deposited: 02 Dec 2020 17:31
Last modified: 03 Dec 2020 17:33

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Contributors

Author: Song Xiao
Author: Can Zhang
Author: Yuanpei Luo
Author: Jingchi Wu
Author: Yang Rao
Author: Jan K. Sykulski ORCID iD

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