Superconducting power system and installing method of superconducting cable

Patent metadata

Field	Value
Publication number	US-9837808-B2
Application number	US-201515030306-A
Country	US
Kind code	B2
Filing date	Mar 30, 2015
Priority date	Oct 16, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The present invention relates to a superconducting power system which is capable of effectively absorbing an axial force caused by the contraction of a superconducting cable when the superconducting cable is cooled and in which the superconducting cable is installed in the form of minimizing unnecessary waste of an installation space, and a method of installing a superconducting cable.

First claim

What is claimed is:

1. A superconducting power system comprising:
a superconducting cable including a former at a center thereof, an inner metallic conduit at an outer side of a cooling channel, and an outer metallic conduit having a vacuum unit at an inner side thereof;
a first connection device connected to one end of the superconducting cable; and
a second connection device connected to another end of the superconducting cable,
wherein at least one suspension section is provided, in which the superconducting cable connecting the first and second connection devices is suspended downward,
wherein a suspension length corresponding to a period of each of the at least one suspension section and a suspension height corresponding to a maximum deflection of the superconducting cable in each of the at least one suspension section satisfy a range of 16.0<suspension length/suspension height<27.5.

2. The superconducting power system of claim 1 , wherein the at least one suspension section has a form of a one-period section connecting adjacent highest points among a sine function and a cosine function.

3. The superconducting power system of claim 1 , wherein the suspension height and a diameter of the superconducting cable satisfy a range of 1.0<suspension height/diameter<2.0.

4. The superconducting power system of claim 1 , wherein the suspension length and a diameter of the superconducting cable satisfy a range of 30<suspension length/diameter<40.

5. The superconducting power system of claim 1 , further comprising at least two support members provided at locations spaced apart from each other to support the superconducting cable so as to form the at least one suspension section.

6. The superconducting power system of claim 2 , further comprising (N+1) support members such that N suspension sections are consecutively disposed adjacent to each other, where N denotes a natural number which is greater than and equal to 2.

7. The superconducting power system of claim 6 , wherein a suspension section having a longer suspension length is greater in height than a suspension section having a shorter suspension length among the N suspension sections.

8. The superconducting power system of claim 1 , wherein the first or second connection device is configured to be a fixed device.

9. The superconducting power system of claim 5 , wherein the superconducting cable is disposed in a horizontal straight line to form a horizontal section from each of the first and second connection device to a support member adjacent thereto.

10. A method of installing a superconducting cable by connecting the superconducting cable to two fixed connection devices, the superconducting cable including a core unit having a former formed of a copper material and a superconducting conductor layer at a center thereof, an inner metallic conduit having a cooling unit for cooling the core unit at an inner side thereof, and an outer metallic conduit accommodating an insulating unit and a vacuum unit outside the inner metallic conduit, the method comprising:
experimentally installing the superconducting cable in the form of a periodic function such that a plurality of suspension sections in which the superconducting cable is suspended downward are disposed adjacent to each other, the plurality of suspension sections having the same suspension length and the same suspension height;
measuring axial forces of the former, the inner metallic conduit, and the outer metallic conduit due to expansion or contraction thereof in a lengthwise direction of the superconducting cable, which is installed in the experimentally installing of the superconducting cable, when the superconducting cable is cooled;
determining installation conditions for installing the superconducting cable, taking into account the sum of the axial forces of the former, the inner metallic conduit, and the outer metallic conduit measured in the measuring of the axial forces, wherein the installation conditions comprise a suspension length corresponding to the distance between the plurality of suspension sections in a horizontal direction and a suspension height of the plurality of suspension sections; and
installing the superconducting cable according to the installation conditions determined in the determining of the installation conditions,
wherein the determining of the installation conditions is performed by comparing the sum of the axial forces of the former, the inner metallic conduit, and the outer metallic conduit measured in the measuring of the axial forces and a length of the superconducting cable to be installed with a maximum allowable axial force and cost conditions, such that the suspension length and the suspension height satisfy a range of 16<suspension length/suspension height<27.5.

11. The method of claim 10 , wherein the determining of the installation conditions is performed such that a relation between the suspension length corresponding to a period of each of the plurality of suspension sections and a diameter of the superconducting cable satisfies a range of 30<suspension length/diameter<40.

12. The method of claim 10 , wherein the determining of the installation conditions is performed such that a relation between the suspension height and a diameter of the superconducting cable satisfies a range of 1.0<suspension height/diameter<2.0.

13. The method of claim 10 , wherein the determining of the installation conditions comprises determining a plurality of allowable installation conditions.

14. The method of claim 10 , wherein the experimentally installing of the semiconducting cable and the measuring of the axial forces are repeatedly performed a plurality of times while changing the suspension length and height of the experimentally installed superconducting cable.

15. The method of claim 10 , wherein the experimentally installing of the superconducting cable and the measuring of the axial forces are performed according to a computer simulation method.

Assignees

• Ls Cable & System Ltd

Inventors

• Lim Young Seok
• Won Yong Hee
• Cho Young Il
• Choi Chang Youl

Classifications

• H02G15/34 Primary

  Cable fittings for cryogenic cables {(superconductive cables per se H01B12/00)} · CPC title

• H01B12/14

  characterised by the disposition of thermal insulation · CPC title

• H02G1/08

  through tubing or conduit, e.g. rod or draw wire for pushing or pulling {(inserting electrical cables into tubes using wallbores E21B17/206; for optical cables G02B6/4401)} · CPC title

• Y02E40/648

  Cross-Sectional Technologies · mapped topic

• Y02E40/60

  Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment · CPC title