Development of an Evaporation-Cooled Underground Transmission System.

摘要

Growing economic and aesthetic pressures encourage the development of advanced underground transmission (UT) systems for bulk electric power. Forced evaporation cooling is one of several specific options with the potential of significantly increasing UT capacity and thereby reducing relative transmission costs. The objective of this study was to investigate the development potential of a particular and novel configuration,described in this report as the Separated-Phase,Evaporation Cooling (SPEC) concept,Forced cooling would be provided by the evaporation of a halocarbon in the hollow conductors of a compressed gas insulated (CGI) cable system. The development potential of the separated-phase evaporation cooling (SPEC) concept for underground CGI cables was studied by addressing crucial issues associated with coolant chemical stability,coolant distribution techniques,and system economics.