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Superconducting DC power transmission for subway lines that can reduce electric resistance and save energy

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  • Tomita, Masaru
  • Fukumoto, Yusuke
  • Ishihara, Atsushi
  • Kobayashi, Yusuke
  • Akasaka, Tomoyuki
  • Suzuki, Kenji
  • Onji, Taiki

Abstract

Electric railway systems are widely used and DC systems have been employed in a number of metropolitan areas. However, they have some problems, such as cancelled regeneration and energy loss. Introducing superconducting feeder cables into railway feeding systems offers a lot of benefits: fewer substations, equalization of load among substations, reduction of cancelled regeneration, power transmission loss. Feeding systems adopted by railways throughout the world can be classified into feeding systems through overhead trolley wires and ground third rails. These problems are especially serious in third rail system because the voltage is low and the electric current is high. By using a newly developed superconducting feeder system on a third rail system, we conducted a power transmission test. Also, the feeding of the high current and regeneration current was proved to be successful in the course of the train running test on subway line. And, we specifically analyzed the energy generated when a cable was adopted into the third rail line. As a result of adoption of a superconducting feeder cable, the voltage drop specific to railways could be reduced even with a short cable. And, if the cable is adopted in subway line, we also observe large energy-saving effect.

Suggested Citation

  • Tomita, Masaru & Fukumoto, Yusuke & Ishihara, Atsushi & Kobayashi, Yusuke & Akasaka, Tomoyuki & Suzuki, Kenji & Onji, Taiki, 2023. "Superconducting DC power transmission for subway lines that can reduce electric resistance and save energy," Energy, Elsevier, vol. 281(C).
    • Handle: RePEc:eee:energy:v:281:y:2023:i:c:s0360544223016444
    DOI: 10.1016/j.energy.2023.128250
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    References listed on IDEAS

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    1. Tomita, Masaru & Suzuki, Kenji & Fukumoto, Yusuke & Ishihara, Atsushi & Akasaka, Tomoyuki & Kobayashi, Yusuke, 2017. "Energy-saving railway systems based on superconducting power transmission," Energy, Elsevier, vol. 122(C), pages 579-587.
    2. Mathiesen, B.V. & Lund, H. & Nørgaard, P., 2008. "Integrated transport and renewable energy systems," Utilities Policy, Elsevier, vol. 16(2), pages 107-116, June.
    3. Masaru Tomita & Masato Murakami, 2003. "High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K," Nature, Nature, vol. 421(6922), pages 517-520, January.
    4. Pietzcker, Robert C. & Longden, Thomas & Chen, Wenying & Fu, Sha & Kriegler, Elmar & Kyle, Page & Luderer, Gunnar, 2014. "Long-term transport energy demand and climate policy: Alternative visions on transport decarbonization in energy-economy models," Energy, Elsevier, vol. 64(C), pages 95-108.
    5. Tomita, Masaru & Fukumoto, Yusuke & Ishihara, Atsushi & Suzuki, Kenji & Akasaka, Tomoyuki & Kobayashi, Yusuke & Onji, Taiki & Arai, Yuki, 2020. "Energy analysis of superconducting power transmission installed on the commercial railway line," Energy, Elsevier, vol. 209(C).
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