Temperature and pressure simulation of a 1.5-km HTS power cable cooled by Subcooled LN2 with a fault current

Tetsuo Yasui, Yusuke Sato, Koh Agatsuma, Atsushi Ishiyama, Xudong Wang, Masayoshi Ohya, Takato Masuda, Shoichi Honjo

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Waseda University has developed computer programs to estimate the transient temperature and pressure distributions in a high-temperature superconducting (HTS) power cable cooled by a forced flow of subcooled LN2. This simulation is crucial for realizing a practical HTS power cable to assess the effects of short-circuit accidents. When a short-circuit accident occurs, a fault current of 31.5 kA with a duration of 2 s may flow in a cable in the worst case, which is the Japanese criterion for a 66-kV transmission line. The temperature profiles of the LN2 coolant and cable cores were analyzed by solving the heat conduction and heat transfer equations using a finite-difference method. The pressure profiles of the LN2 coolant were calculated using Fanning's equation. For practical use, it was assumed that HTS cables that are a few kilometers long will be adopted. In this study, an evaluation of the stability of a 1.5-km HTS cable with a fault current of 31.5 kA over 2.0 s was performed using our computer program. According to the results, the temperature of the LN2 coolant at the outlet reached the saturation temperature after the fault, and vaporization suddenly occurred. The evaporated gas was released from the outlet to the terminal.

Original languageEnglish
Article number7420650
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number3
DOIs
Publication statusPublished - 2016 Apr

Keywords

  • LN2 coolant
  • fault current
  • high-temperature superconducting power cable
  • saturation temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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