Development of a Highly Reliable Helium Refrigeration System - R&D of a Highly Reliable Helium Refrigeration System (Conventional Type)-

摘要

The present paper reports the development of the refrigeration system that is applied to 70 MW class superconducting generators (SCG). The main subject in develop technology for removing impurities in helium gas, which largely affects its reliability, and to further improve the reliability and efficiency of its main components as screw compressors, turbo xpanders, and a low temperatture adsorber. Thus this paper deals wiht its planning and performance testing as well as automatic control in different modes of operation (such as cool-down, steady-state and heart run) and also the reliability analysis. It was verified that the developed refrigeration system demonstrated a higher reliability of 14,637 hours (MTBF), larger than 10,000 hours. The total operation time at steady state has reached 9,320 hours wiht no failures in the entire testing period.