抄録
Problems concerning cooling of long-distance cryogenic system are disussed, with special regard to the application for low-temperature power transmission. Inportance of transient state, such as first stage cooling down, or power transmissiom fault, is stressed, because it is probable that some main dimensions of cryogenic systems will be determined solely from the considerations of these transient states, in advance of the optimization of whole electrical and cryogenic system.
