Temperature and Pressure Distribution Simulations of 3-km-Long High-Temperature Superconducting Power Cable System with Fault Current for 66-kV-Class Transmission Lines

Tetsuo Yasui, Natsuko Takeda, Yusuke Yokoo, Ko Agatsuma, Atsushi Ishiyama, Xudong Wang, Takato Masuda, Toshiya Morimura, Tomoo Mimura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A computer program has been developed by numerically solving the nonlinear heat conduction and heat transfer equations, which are discretized using the finite difference method, to calculate the temperature and pressure distributions in high-temperature superconducting (HTS) power cables cooled using liquid nitrogen (LN2). The LN2 coolant properties are estimated using Cryodata's GASPAK software package. This evaluation of the temperature and pressure distributions is important to understand how we can make practical use of HTS power cables and to assess the effects of short-circuit accidents. To incorporate HTS power cables into real grids, it is necessary to evaluate HTS power cables that are a few kilometers long. In this study, 3-km-long HTS cables were evaluated using our proposed computer program. This program was used to model the cooling system, ac loss, dielectric loss, and intermediate-joint losses. The results revealed that the temperature of the LN2 coolant at the cable outlet could reach the saturation temperature when a fault current of 31.5 kA flowed for 2 s (worst case for the 66-kV-class transmission lines in Japan). From the results, it was also clear that the effects of the ac loss, dielectric loss, and intermediate-joint losses on the increase in the temperature of the LN2 coolant could not be ignored.

Original languageEnglish
Article number7828002
JournalIEEE Transactions on Applied Superconductivity
Volume27
Issue number4
DOIs
Publication statusPublished - 2017 Jun

Keywords

  • Cooling system
  • LN 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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