Safety Verification of a 275-kV HTS Cable System under Short-Circuit Current Accidents

Yusuke Yokoo, Natsuo Takeda, Daichi Horita, Koh Agatsuma, Atsushi Ishiyama, Xudong Wang, Tomohiro Takagi, Masashi Yagi

    Research output: Contribution to journalArticle

    Abstract

    A simulation code that analyzes the temperature and pressure in a high-temperature superconducting (HTS) power cable cooled by a forced flow of subcooled liquid nitrogen (LN) has been developed. Analysis of the HTS cable is useful for comprehending the normal operating condition and the generation of heat during the transient state. In Japan, an excessive current of 63 kA may flow in an HTS cable for 0.6 s in the worst case when a short-circuit current accident occurs in a 275-kV class cable. To assess the safety under this condition, a simulation of a 275-kV class 20-m model cable was performed, and the simulation results of the temperature profiles qualitatively agreed with the experimental results. In this study, a finite-difference method was used to solve the nonlinear partial differential equations of the heat-transfer phenomenon through heat conduction. By solving these equations, the temperature profiles of the LN coolant and the cable cores were analyzed. The GASPAK software package (Cryodata) was used to evaluate the fluid properties when the LN temperature in the cable was calculated. According to this result, the simulations focused on the analysis of a real-scale HTS cable in this work.

    Original languageEnglish
    Article number8268064
    JournalIEEE Transactions on Applied Superconductivity
    Volume28
    Issue number4
    DOIs
    Publication statusPublished - 2018 Jun 1

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    Keywords

    • AC loss
    • fault currents
    • HTS cables
    • power cables
    • temperature
    • thermal conductivity

    ASJC Scopus subject areas

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

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