Tokyo Power Company and The Furukawa Electric Co., Ltd. are advancing development in the base, element and system aiming at the achievement of a compact high-
Tc supercondunting cable of the 66kV class. The HTS wire used for the HTS cable must have a high critical current density (
Jc), be flexible and easy to make in long lengths. The most advanced wire is Bi2223 silver sheath multi-filamentary wire judging from these requirements. We developed a Bi2223 silver sheath wire that has
Jc>20kA/cm
2 when long in length. Moreover, a wire with a filament twist, aiming at AC loss reduction, was developed, and a decrese in AC loss was comfirmed. To improve the mechanical properties of the wire, a multi-filamentary wire was made using Ag-Mg 0.2wt% alloy for the outside sheath. Concerning important AC losses for the HTS cable, a 50m-long conductor was manufactured and the AC losses were measured. As a result, it was comfirmed that AC losses could be decreased by making the current distribution of the each layer uniform. We newly proposed the UCD (Uniform Current Distribution) model, and succeeded in analyzing the AC losses of the UCD conductor by this model. Concerning the electrical insulation, which is an important cable component, the design data of an insulating paper impregnated by liquid nitrogen was able to be obtained by executing an electric insulation test using a model-cable. We manufactured a 66kV class-2kA
peak prototype cable 5m long, and succeeded in making a load test. This prototype cable consisted of one HTS conductor that had electric insulation, a thermal insulated tube and two terminals that connected to both ends to do the load test.
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