Thermal Distribution Modeling and Experimental Verification of Contact Wire Considering the Lifting or Dropping Pantograph in Electrified Railway

Gao, Shibin; Wang, Ying; Liu, Zhigang; Mu, Xiuqing; Ke, Huang; Song, Xiaocui

doi:10.1109/tte.2016.2558841

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…Its copolymer structure makes it an excellent elastomer material. With this unique structure, EPR material has better cold resistance and can maintain better softness <−55°C [25]. Unlike other polymers, which are cross‐linked by only one monomer, the glass transition temperature ( T g ) of EPR as a copolymer is closely related to the T g of the polymer with two monomer components.…”

Section: Discussion and Analysismentioning

confidence: 99%

“…Unlike other polymers, which are cross‐linked by only one monomer, the glass transition temperature ( T g ) of EPR as a copolymer is closely related to the T g of the polymer with two monomer components. The following relationship exists [25]

T_{normalg} = W_{1} T_{g 1} + W_{2} T_{g 2}

where W 1 and W 2 are the mass fractions of the two components, T g1 and T g2 are the glass transition temperatures of each polymer component, respectively. When the external temperature reaches the T g of ethylene components, no glass transition happens in the local region inside the EPR, so the temperature ranges for the EPR to maintain a high elastic state is widened.…”

Section: Discussion and Analysismentioning

confidence: 99%

“…Unlike other polymers, which are cross-linked by only one monomer, the glass transition temperature (T g ) of EPR as a copolymer is closely related to the T g of the polymer with two monomer components. The following relationship exists [25] T…”

Section: Analysis Of Aggregation State Transition Of Epr At Differentmentioning

confidence: 99%

See 2 more Smart Citations

Influences of low temperature on internal gas-filled cavity discharges in EPR cable termination and its feature factors analysis

Zhou

Bai

Zhang

et al. 2020

IET Science, Measurement &Amp; Technology

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Ethylene-propylene rubber (EPR) cable is the most commonly used type in high-speed railway. Several flashover accidents take place in cable termination in an extremely cold environment. In this study, EPR cable terminations were tested in a simulated low-temperature system with varied applied voltages. The results showed that the differences in elastic modulus and free space volume between EPR insulation and stress control tube (SCT) in a frigid environment would lead to structural defects between them. Damages on the EPR insulation occurred in the form of flashover point when the ambient temperature declined to −30°C and below, with the growth rate of discharge and resulting extent of damage across the EPR/SCT interface being non-linearly related to ambient temperature. Besides, the partial discharge (PD) initial voltage and PD extinction voltage under low-temperature conditions reduced by >40% compared with those at 20°C. The flashover probability of EPR terminations increased significantly, and the shape characteristics of PD patterns have also changed obviously at low temperatures. It can be verified that under the high-voltage and low-temperature conditions, the EPR/SCT interface is prone to organisational mismatch, which will lead to the PD phenomenon and seriously affect the stable operation of EPR cable terminations.

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Section: Discussion and Analysismentioning

confidence: 99%

T_{normalg} = W_{1} T_{g 1} + W_{2} T_{g 2}

Section: Discussion and Analysismentioning

confidence: 99%

See 1 more Smart Citation

Influences of low temperature on internal gas-filled cavity discharges in EPR cable termination and its feature factors analysis

Zhou

Bai

Zhang

et al. 2020

IET Science, Measurement &Amp; Technology

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“…The wear of the pantograph strip has always been of crucial concern in relation to the sliding electrical contact of the PCS. To understand the factors influencing the wear of the strip, research studies have analysed the effects of the sliding speed, contact force, electrical current, friction coefficient, and arc energy [2–4], while models for wear prediction have been constructed to describe the relationship between those factors [5]. With the drive to pursue higher and higher speeds, improvements to the structure and material of the pantograph strip are essential to satisfy the growing requirements in terms of the impact resistance, abrasion resistance, and electrochemical erosion resistance.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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A pantograph–catenary system (PCS) – an essential component to supply a high‐speed train (HST) – faces a variety of new challenges due to the continuously increasing train speeds. The HST traction system receives power via an electrical contact between the pantograph strip and the high‐voltage contact wire. This electrical contact is subject to serious mechanical shocks and significant electrochemical corrosion, making the modelling of the dynamic processes complicated, especially under high‐speed and heavy‐load conditions. The damage to the PCS – which is particularly noticeable at the edges of the pantograph strip – may become severe as the speed of the train rises. Moreover, as the speed increases, the distribution of the electrical current in the strip becomes uneven due to the velocity skin effect (VSE). To assess the impact of the VSE on the performance of PCSs, a multi‐physics model has been created and is reported in this study. The model has been validated through experiments and the main aspects of its functionality – such as the VSE, friction, and air convection – have been identified and analysed at different speeds. The impact of speed on the traction current and the behaviour of thermal sources have been explored. With the increasing speed, the phenomenon of current clustering at the trailing edge of the strip becomes quite dramatic, resulting in a thermal surge in the region of the strip with high current density. To mitigate the negative impact caused by VSE in the PCSs, an improved kriging optimisation methodology has been utilised to optimise the parameters of the PCS. Recommendations regarding the optimal design of the PCS are put forward to improve the current‐carrying performance and reduce the local temperature rise in the strip.

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“…The use of thermal imaging systems allow thermal information to be very rapidly collected over a wide area and in a non-contact mode. This makes it promising in pantograph-catenary system inspection in high-speed train system [21]. Infrared information can be captured by bulky infrared cameras which offer high-resolution infrared images, 70 or by small-size infrared sensors which connected to wireless sensor networks for long-term and remote monitoring [22,23].…”

mentioning

confidence: 99%

Infrared and visible images registration with adaptable local-global feature integration for rail inspection

Tang

Tian

Chen

et al. 2017

Infrared Physics & Technology

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Active thermography provides infrared images that contain sub-surface defect information, while visible images only reveal surface information. Mapping infrared information to visible images offers more comprehensive visualization for decision-making in rail inspection. However, the common information for registration is limited due to different modalities in both local and global level. For example, rail track which has low temperature contrast reveals rich details in visible images, but turns blurry in the infrared counterparts. This paper proposes a registration algorithm called Edge-Guided Speeded-Up-Robust-Features (EG-SURF) to address this issue. Rather than sequentially integrating local and global information in matching stage which suffered from buckets effect, this algorithm adaptively integrates local and global information into a descriptor to gather more common information before matching. This adaptability consists of two facets, an adaptable weighting factor between local and global information, and an adaptable main direction accuracy. The local information is extracted using SURF while the global information is represented by shape context from * Corresponding author edges. Meanwhile, in shape context generation process, edges are weighted according to local scale and decomposed into bins using a vector decomposition manner to provide more accurate descriptor. The proposed algorithm is qualitatively and quantitatively validated using eddy current pulsed thermography scene in the experiments. In comparison with other algorithms, better performance has been achieved.

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Thermal Distribution Modeling and Experimental Verification of Contact Wire Considering the Lifting or Dropping Pantograph in Electrified Railway

Cited by 21 publications

References 19 publications

Influences of low temperature on internal gas-filled cavity discharges in EPR cable termination and its feature factors analysis

Influences of low temperature on internal gas-filled cavity discharges in EPR cable termination and its feature factors analysis

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

Infrared and visible images registration with adaptable local-global feature integration for rail inspection

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