Abstract
A direct current superconducting power transmission (DC‐SCPT) test facility with 20‐meter power cable has been developed in Chubu University. Heat leakage through current leads dominates in case of short‐distance DC‐SCPT. To solve this problem, we have developed special Peltier current lead (PCL) with bismuth telluride (BiTe) alloy is used as a Peltier material, and have studied a gas‐cooled PCL as a novel type current lead for higher reduction of the heat leakage. In order to achieve high efficiency, highest thermoelectric figure of merit material is important to be used especially at low temperature conditions. In our work we measured the thermoelectric properties of BiTe samples, and optimized geometry of PCL by the numerical calculations. It was fount that the heat leakages through PCL and gas‐cooled PCL are reduced to 55% and to 36% of the conventional copper current lead (CCL) at the self‐cooling condition, correspondingly. PCL can reduce the total electric power consumption of the whole system. We also discuss the heat exchange ratio for the gas‐cooled PCL, and extend this approach for further reduction of the heat leakage.
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