RTRI REPORT May. 2003
OTHER PAPERS

A Cooling System for Superconducting Transformers for Railway Vehicles

Kazuya IKEDA,  Toshiki HERAI,  Ken NAGASHIMA,
Hiroshi HATA,  Hiroyuki FUJIMOTO,  Hiroki KAMIJO


  Research and development are being conducted to reduce the weight and improve the efficiency of railway vehicles, by using high-temperature superconducting wire materials in the winding of main transformers for railway vehicles. In such transformers, it is necessary to immerse the high-temperature superconducting wire materials in liquid nitrogen. It is also essential to have a refrigeration system that preserves the liquid nitrogen level in a closed system. Based on the results of apparatus tests, this report explains the features of main transformers designed for railway vehicles that use high-temperature superconducting wire materials. This paper describes the changes in the load of the refrigerator include refrigerator temperature control, attainment of sub-cool conditions, and characteristics of heat transmission between the refrigerator cold head and transformer. Also described are the characteristics of heat infiltration into current supplying power leads.


* Full papers of RTRI Report are written in Japanese.

Copyright (c) 2003 Railway Technical Research Institute