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Provided is a superconducting cable having a structure such that cable cores, each having a superconducting layer, are housed in a thermal insulation pipe and the superconducting layer of each cable core has portions having different critical current values. When an excessive current flows in the su

Provided is a superconducting cable having a structure such that cable cores, each having a superconducting layer, are housed in a thermal insulation pipe and the superconducting layer of each cable core has portions having different critical current values. When an excessive current flows in the superconducting layer in case of a short-circuit failure, the current exceeds the critical current value of the portion having a smaller critical current value first, which results in damage to the portion, suppressing the occurrence of damage to the other normal portion. A superconducting cable line using this superconducting cable and a splitter for accommodating the cable cores therein is also provided.

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What is claimed is: 1. A superconducting cable comprising a superconducting layer, wherein the superconducting layer has a portion whose critical current value is differentiated from the critical current value of another, normal portion, wherein: the portion of the superconducting layer is a curren

What is claimed is: 1. A superconducting cable comprising a superconducting layer, wherein the superconducting layer has a portion whose critical current value is differentiated from the critical current value of another, normal portion, wherein: the portion of the superconducting layer is a current limiting portion having a critical current value smaller than that of the normal portion; and the current limiting portion and the normal portion are constituted by superconducting tape having superconductive clad wires, and the current limiting portion having a smaller number of the clad wires than that used for the normal portion so that the amount of superconductor of the current limiting portion is reduced as compared to the normal portion. 2. A superconducting cable according to claim 1, wherein the superconducting tape used for the current limiting portion and the normal portion are connected by soldering. 3. A superconducting cable according to claim 2, wherein the superconducting layer is at least one of a superconducting conductor layer and a shielding layer provided at the outer periphery of the superconducting conductor layer. 4. A superconducting cable according to claim 1, wherein the superconducting layer is at least one of a superconducting conductor layer and a shielding layer provided at the outer periphery of the superconducting conductor layer. 5. A superconducting cable line comprising: a superconducting cable set forth in claim 1 having a plurality of cable cores each including a superconducting layer having a critical current limiting portion and a normal portion; and a splitter which houses separated portions of the plurality of cable cores such that the separated cable cores are distanced from each other, wherein the critical current limiting portion of each of the plurality of cable cores are housed in the splitter. 6. A superconducting cable line according to claim 5, wherein a coolant for cooling the superconducting cable fills the splitter, and a regulating valve for regulating the pressure when the coolant vaporizes is provided for the splitter. 7. A superconducting cable line according to claim 6, wherein the critical current limiting portions having a smaller critical current value are disposed in the splitter at positions distanced from the assembled portions of the cable cores: namely, at the end side of the split cable cores in the case of the splitter being a termination joint box, and a central position in the case of the splitter being an intermediate joint box. 8. A superconducting cable line according to claim 6, wherein holding fixtures for holding the cable cores in the splitter are movable in the splitter in accordance with the expansion and contraction of the cable cores and hold the cable cores in a state in which the cable cores are separated from each other. 9. A superconducting cable line according to claim 5, wherein portions having a smaller critical current value are disposed in the splitter at positions distanced from assembled portions of the cable cores: namely, at the end side of the split cable cores in the case of the splitter being a termination joint box, and at a central position in the case of the splitter being an intermediate joint box. 10. A superconducting cable line according to claim 9, wherein holding fixtures for holding the cable cores in the splitter are movable in the splitter in accordance with the expansion and contraction of the cable cores and hold the cable cores in a state in which the cable cores are separated from each other. 11. A superconducting cable line according to claim 5, wherein holding fixtures for holding the cable cores in the splitter are movable in the splitter in accordance with the expansion and contraction of the cable cores and hold the cable cores in a state in which the cable cores are separated from each other. 12. A superconducting cable line comprising: a superconducting cable set forth in claim 2 having a plurality of cable cores each including a superconducting layer having a critical current limiting portion and a normal portion; and a splitter which houses separated portions of the plurality of cable cores cuh that the separated cable cores are distanced from each other, wherein the critical current limiting portion of each of the plurality of cable cores are housed in the splitter. 13. A superconducting cable line according to claim 12, wherein a coolant for cooling the superconducting cable fills the splitter, and a regulating valve for regulating the pressure when the coolant vaporizes is provided for the splitter. 14. A superconducting cable line comprising: a superconducting cable set forth in claim 4 having a plurality of cable cores each including a superconducting layer having a critical current limiting portion and a normal portion; and a splitter which houses separated portions of the plurality of cable cores such that the separated cable cores are distanced from each other, wherein the critical current limiting portion of each of the plurality of cable cores are housed in the splitter. 15. A superconducting cable line according to claim 14, wherein a coolant for cooling the superconducting cable fills the splitter, and a regulating valve for regulating the pressure when the coolant vaporizes is provided for the splitter. 16. A superconducting cable line comprising: a superconducting cable set forth in claim 3 having a plurality of cable cores each including a superconducting layer having a critical current limiting portion and a normal portion; and a splitter which houses separated portions of the plurality of cable cores such that the separated cable cores are sufficiently distanced from each other, wherein the critical current limiting portion of each of the plurality of cable are housed in the splitter. 17. A superconducting cable line according to claim 16, wherein a coolant for cooling the superconducting cable fills the splitter, and a regulating valve for regulating the pressure when the coolant vaporizes is provided for the splitter.