Super-conductive cable

Abstract

A super-conductive cable includes: a former (2); a super-conductive layer (3) formed on the outer circumference of the former (2); an electrically insulating layer (4) formed on the outer circumference of the conductive layer (3); a shield layer (6) formed on the outer circumference of the insulating layer (4); and a normally conductive metal layer (5) formed between the insulation layer (4) and the shield layer (6). The normally conductive metal layer (5) existing inside the shield layer (6) has a greater inductance than the shield layer (6), thereby suppressing temperature increase of the super-conductive layer when an accident such as shortcircuit has occurred and reducing the AC loss during normal current flowing because more current flows by the shield layer (6).

Description

technical field [0001] The invention relates to a superconducting cable comprising a skeleton, a superconducting layer and an electrical insulating layer. More particularly, the present invention relates to a superconducting cable capable of transferring a large current caused by a short-circuit accident or the like to suppress heat generation in a superconducting layer and also capable of reducing AC loss during normal current passage. Background technique [0002] Conventionally, a superconducting cable including a superconducting conductor formed of a Bi-based high temperature superconducting wire or the like is known. attached figure 2 (A) is a cross-sectional view of a three-core type three-phase superconducting cable including three cable cores, and the attached figure 2 (B) is a perspective view showing an example of a core. The superconducting cable 100 is configured to include three cable cores 102 enclosed in a heat insulating tube 101 . [0003] Refer to attac...

AI Technical Summary

Problems solved by technology

At the same time, a large current is induced in the shielding layer, which changes the shielding layer into a common conductor, thus causing Joule losses

In particular, when severe Joule loss is caused, it may cause the superconducting wire constituting the superconducting conductor or shield to burn, or it may suddenly increase its temperature so that the refrigerant collected in the space inside the wire evaporates, causing superconducting wire Gas filling (nitrogen filling), thus reducing the critical current value

In addition, evaporation of the refrigerant may cause dielectric breakdown

In this case, it takes a considerable amount of time to repair the damage caused by these accidents

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