JPH0945151A - Superconducting cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply tensile strength to a superconducting cable and install it in a conduit by providing a tensile strength member at nearly the center of a three-conductor integral superconducting cable. SOLUTION: Three superconducting cable conductors 2 are stored in a heat insulating pipe 1. The heat insulating pipe 1 is mainly constituted of a corrugated pipe, a heat insulating layer, and a corrosionproof layer, and a refrigerant passage 3 of liquid nitrogen is formed in it. Each core 2 is constituted of a former 4, a superconducting conductor 5, an electric insulating layer 6, and a shielding layer 7 in sequence from the inner layer, and the inside of the former 4 becomes a refrigerant passage 8. A tensile strength member 9 is arranged at the position surrounded by the cable cores 2, i.e., nearly the center of a cable. Steel, stainless, or FRP is used for the material of the tensile strength member 9. Tensile stress can be applied to the center tensile strength member 9, and the cable can be utilized for tensile installation such as the storage in a conduit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting cable.

[0002]

2. Description of the Related Art As a conventionally known three-core all-in-one type superconducting cable, for example, there is one described in JP-A-2-299108. This is one in which three superconducting cable cores are housed in a metal tube having a heat insulating layer and the like, and no tensile strength member is provided.

[0003]

Generally, in a normal CV cable, a copper conductor is provided with a tension during laying. However, since the ceramic conductor used for the superconducting cable has a small cross-sectional area and the superconducting property is deteriorated by excessive tension, the conductor cannot bear the tension. On the other hand, in the superconducting cable, since a corrugated pipe is used for the former and the heat insulating pipe in consideration of heat shrinkage and bending, it is not possible to bear the tension on this as well. For this reason, there is a problem in that it cannot be laid on a pipeline because tension cannot be applied to lay it.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and is characterized in that a tensile strength member is provided at the center of a three-core batch type superconducting cable. Here, the tensile strength member is preferably pipe-shaped so that it can be used as a refrigerant flow path.

[0005]

Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of the cable of the present invention. As shown in the drawing, a three-core superconducting cable core 2 is housed inside a heat insulating tube 1. The heat insulating tube 1 is mainly composed of a corrugated tube, a heat insulating layer, and an anticorrosive layer, and the inside thereof serves as a refrigerant flow path 3 for liquid nitrogen or the like. In addition, each superconducting cable core 2 is, in order from the inner circumference,
The former 4, the superconducting conductor 5, the electric insulating layer 6, and the shielding layer 7 are formed, and the inside of the former 4 serves as a coolant channel 8. The tensile strength member 9 is arranged at a position surrounded by the superconducting cable cores 2, that is, substantially at the center of the cable. Examples of the material of the tensile strength member 9 include steel, stainless steel, FRP and the like. In the figure, the tensile strength member 9 is rod-shaped, but if this is made pipe-shaped, the inside can be used as a coolant channel.

With such a structure, the tensile strength member at the center can be given a tensile stress, and the tensile strength member can be stored in a pipe line.
It can be used for laying under tension. In addition, since tension is applied to the tensile strength member at the center of the cable, when laying it, 3
It is also possible to prevent the superconducting cable core of the core from twisting and laughing. Furthermore, by making the tensile member a pipe,
The inside can be used as a coolant channel. In this case, since the tensile strength member is located in the central portion of the cable, it is possible to form a flow path with less meandering and a smaller pressure loss than other refrigerant flow paths.

[0007]

As described above, the cable of the present invention can effectively impart tensile stress to the tensile strength member at the center, and is effective when used for laying in a conduit or the like. Further, in the cable according to the second aspect, by forming the tensile strength member into a pipe shape, the inside can be used as a refrigerant flow path.

[Brief description of drawings]

FIG. 1 is a sectional view of a cable of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation pipe 2 Superconducting cable core 3 Refrigerant flow path 4 Former 5 Superconducting conductor 6 Electric insulating layer 7 Shielding layer 8 Refrigerant flow path 9 Tensile member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Ishii 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company

Claims (2)

[Claims] 1. A superconducting cable in which a tensile strength member is provided substantially at the center of the three-core superconducting cable. 2. The superconducting cable according to claim 1, wherein the tensile strength member has a pipe shape.