Abstract
This chapter investigates the working of a new type of cryostat system applying boil-off calorimetry method. The power cable system consists of termination cryostats, high temperature superconducting (HTS) power cable and their cooling system. The current lead located in the termination cryostat is used to transmit the power from the room temperature power cable to the low temperature HTS power cable. Because the current lead is the major heat source of cooling load, the heat load of the current lead has influence of the liquid nitrogen consumption and the refrigeration capacity. For this reason, the design of current lead with smaller heat load is very crucial for the economic refrigeration system. One of the main characteristics of the system is to avoid gas convection cooling effect. A prototype current lead inserted in the system was made of copper. Heat loads through the copper current lead were measured for four different heat load conditions. The experimental results coincide with the numerical ones within 3% error.
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