Volume 26 Issue 4
Apr.  2026
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LI Qiu-jun, HU Dao-yu, GAO Tian-yu, ZHANG Zhi-hua. Design of grounding system of propulsion coils for low-vacuum tube maglev train[J]. Journal of Traffic and Transportation Engineering, 2026, 26(4): 276-285. doi: 10.19818/j.cnki.1671-1637.2026.019
Citation: LI Qiu-jun, HU Dao-yu, GAO Tian-yu, ZHANG Zhi-hua. Design of grounding system of propulsion coils for low-vacuum tube maglev train[J]. Journal of Traffic and Transportation Engineering, 2026, 26(4): 276-285. doi: 10.19818/j.cnki.1671-1637.2026.019
shu

Design of grounding system of propulsion coils for low-vacuum tube maglev train

doi: 10.19818/j.cnki.1671-1637.2026.019
  • 1.

    Shanxi Laboratory on T-Flight, Datong 038103, Shanxi, China

  • 2.

    Institute of Magnetic Levitation and Electromagnetic Propulsion, China Aerospace Science and Industry Corporation Limited, Beijing 100143, China

Funds:

Shanxi Provincial Basic Research Plan Program 202403021221351

National Key R&D Program of China 2024YFF0508004

More Information
  • Corresponding author: HU Dao-yu, research fellow, PhD, E-mail: daoq_b@163.com
  • Received Date: 2025-04-30
  • Accepted Date: 2026-08-22
  • Rev Recd Date: 2025-07-07
  • Publish Date: 2026-04-28
    Abstract
  • To study the grounding system of propulsion coils and the distribution of overvoltage characteristics for low-vacuum tube maglev train, a dual-port equivalent circuit model including ground propulsion coils, a metal low-vacuum tube, and distributed grounded devices was established. The accuracy of the equivalent circuit model was verified with data from published literature. Based on this model, the voltage response distribution characteristics of propulsion coils under lightning overvoltage were analyzed. The grounding system design was optimized from two dimensions: the number of ground points of propulsion coils as well as the insulation resistance between longitudinal grounded lines and the metal low-vacuum tube. Analysis results show that when lightning strikes the propulsion coils, local overvoltage is induced, but the overvoltage of other propulsion coils is suppressed by grounding. Between two ground points, the voltage changes with the distance from the ground points. The voltage shows a trend of first rising and then falling. The metal low-vacuum tube acts as a lightning protection strip to ensure that lightning cannot strike the propulsion coils directly. Meanwhile, insulation resistance exists between the longitudinal grounded lines (connected to the propulsion coils) and the metal low-vacuum tube, which effectively ensures that the overvoltage is suppressed to less than 1.0. The insulation resistance value between longitudinal grounded lines and the metal low-vacuum tube significantly affects the overvoltage level in propulsion coils. When the resistance value is greater than 10 kΩ, the overvoltage of all propulsion coils along the line can be guaranteed to be less than 1.0. Therefore, the configuration can be optimized with two parameters, namely, the number of ground points and the resistance between longitudinal grounded lines and the metal low-vacuum tube. Thus, the engineering implementation cost can be reduced while ensuring system safety. A theoretical basis and technical support is provided for the engineering application of ultra-high-speed low-vacuum tube maglev trains.

     

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