Superconducting wire

Patent metadata

Field	Value
Publication number	US-10128026-B2
Application number	US-201615740559-A
Country	US
Kind code	B2
Filing date	Jun 23, 2016
Priority date	Jun 30, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A superconducting wire having improved electrical and physical properties.

First claim

The invention claimed is:

1. A superconducting wire having a width of 0.4 mm to 0.5 mm and a thickness of 0.3 mm to 0.5 mm and formed of YBCO or ReBCO (Re=Sm, Gd, Nd, Dy, Ho) as a superconductive material, wherein a critical current DC Ic is in a range of 150 A to 500 A at a temperature of 77 K, under pressure of 1 atmosphere, and at a self-field.

2. The superconducting wire of claim 1 , wherein a critical current when bending stress is applied to the superconducting wire using two rollers each having a diameter of 35 mm after the superconducting wire is sequentially bent in different directions is greater than or equal to 95% of the critical current DC Ic.

3. The superconducting wire of claim 1 , wherein a critical current when double bending stress is applied to the superconducting wire using four rollers each having a diameter of 50 mm after the superconducting wire is sequentially bent in different directions is greater than or equal to 95% of the critical current DC Ic.

4. The superconducting wire of claim 1 , wherein a tensile critical current when a tensile force of 250 MPa or a tensile strength extending the superconducting wire by 0.2% is applied in a lengthwise direction of the superconducting wire is greater than or equal to 95% of the critical current DC Ic.

5. The superconducting wire of claim 1 , wherein a torsion critical current when the superconducting wire is twisted at intervals of 200 mm in a lengthwise direction of the superconducting wire is greater than or equal to 95% of the critical current DC Ic.

6. The superconducting wire of claim 1 , wherein a critical current when the superconducting wire is wound around a former of a superconducting cable at a pitch of about 220 mm and a load of 3 kg to 8 kg is applied in a lengthwise direction of the superconducting wire is greater than or equal to 95% of the critical current DC Ic.

7. The superconducting wire of claim 1 , wherein the superconducting wire is jointed in units of 200 meters to 400 meters, and
a joint resistance value at jointed portions of the superconducting wire is 200 nΩ or less.

8. The superconducting wire of claim 7 , wherein the joint resistance value at the jointed portions of the superconducting wire when the superconducting wire is wound around a former of a superconducting cable at a pitch of about 220 mm and a load of 3 kg to 8 kg is applied in a lengthwise direction of the superconducting wire is 240 nΩ or less or is greater by 20% or less than a joint resistance value at normal times.

9. The superconducting wire of claim 1 , wherein a critical current when the superconducting wire is immersed for 16 hours in liquid nitrogen having an internal pressure maintained at about 30 MPa is greater than or equal to 95% of the critical current DC Ic.

10. The superconducting wire of claim 1 , wherein the superconducting wire does not balloon when immersed for 16 hours in liquid nitrogen having an internal pressure maintained at about 30 MPa and when inspected with naked eyes.

11. The superconducting wire of claim 1 , wherein a slop of a voltage with respect to a current greater than or equal to the critical current DC Ic is in a range of 25 to 30.

12. The superconducting wire of claim 1 , wherein alternating-current (AC) loss of the superconducting wire is 0.4 W/kA*m or less.

13. A superconducting wire having a width of 0.4 mm to 0.5 mm and a thickness of 0.3 mm to 0.5 mm and formed of YBCO or ReBCO (here, Re=Sm, Gd, Nd, Dy, Ho) as a superconductive material, wherein a critical current DC Ic is in a range of 150 A to 500 A at a temperature of 77 K, under pressure of 1 atmosphere, and at a self-field,
wherein a critical current when bending stress is applied to the superconducting wire using two rollers each having a diameter of 35 mm after the superconducting wire is sequentially bent in different directions is greater than or equal to 95% of the critical current DC Ic,
wherein a critical current when double bending stress is applied to the superconducting wire using four rollers each having a diameter of 50 mm after the superconducting wire is sequentially bent in different directions is greater than or equal to 95% of the critical current DC Ic,
wherein a critical current when a tensile force of 250 MPa or a tensile strength extending the superconducting wire by 0.2% is applied in a lengthwise direction of the superconducting wire is greater than or equal to 95% of the critical current DC Ic,
wherein a critical current when the superconducting wire is twisted at intervals of 200 mm in the lengthwise direction is greater than or equal to 95% of the critical current DC Ic, and
wherein a critical current when the superconducting wire is wound around a former of a superconducting cable at a pitch of about 220 mm and a load of 3 kg to 8 kg is applied in the lengthwise direction or when the superconducting wire is immersed for 16 hours in liquid nitrogen having an internal pressure maintained at about 30 MPa is greater than or equal to 95% of the critical current DC Ic,
wherein the superconducting wire is jointed in units of 200 meters to 4000 meters,
wherein a joint resistance value at jointed portions of the superconducting wire is 200 nΩ or less,
wherein a joint resistance value when the superconducting wire is wound around a former of a superconducting cable at a pitch of about 220 mm and a load of 3 kg to 8 kg is applied in the lengthwise direction of the superconducting wire is 240 nΩ or less or is greater by 20% or less than a joint resistance value at normal times,
wherein a slop of a voltage with respect to a current greater than or equal to the critical current DC Ic is in a range of 25 to 30, and
wherein alternating-current (AC) loss of the superconducting wire is 0.4 W/kA*m or less.

14. A superconducting wire having a width of 0.4 mm to 0.5 mm and a thickness of 0.3 mm to 0.5 mm and formed of YBCO or ReBCO (here, Re=Sm, Gd, Nd, Dy, Ho) as a superconductive material, wherein the superconducting wire does not balloon when immersed for 16 hours in liquid nitrogen having an internal pressure maintained at about 30 MPa and when inspected with naked eyes.

15. A superconducting wire having a width of 0.4 mm to 0.5 mm and a thickness of 0.3 mm to 0.5 mm and formed of YBCO or ReBCO (here, Re=Sm, Gd, Nd, Dy, Ho) as a superconductive material, wherein a critical current DC Ic is in a range of 150 A to 500 A at a temperature of 77 K, under pressure of 1 atmosphere, and at a self-field,
wherein a critical current when bending stress is applied to the superconducting wire using two rollers each having a diameter of 35 mm after the superconducting wire is sequentially bent in different directions is greater than or equal to 95% of the critical current DC Ic,
wherein a critical current when double bending stress is applied to the superconducting wire using four rollers each having a diameter of 50 mm after the superconducting wire is sequentially bent in different directions is greater than or equal to 95% of the critical current DC Ic,
wherein a critical current when a tensile force of 250 MPa or a tensile strength extending the superconducting wire by 0.2% is applied in a lengthwise direction of the superconducting wire is greater than or equal to 95% of the critical current DC Ic,
wherein a critical current when the superconducting wire is twisted at intervals of 200 mm in the lengthwise direction is greater than or equal to 95% of the critical current DC Ic, and
wherein a critical current when the superconducting wire is wound around a former of a superconducting cable at a pitch of about 220 mm and a load of 3 kg to 8 kg is applied in the

Assignees

• Ls Cable & System Ltd

Inventors

• Na Jin Bae
• Kim Young Woong
• Choi Chang Youl
• Ryu Cheol Hwi
• Lee Seok Ju

Classifications

• H01B12/00

  Superconductive or hyperconductive conductors, cables, or transmission lines · CPC title

• H01B12/06 Primary

  Films or wires on bases or cores · CPC title

• H01B12/16

  characterised by cooling · CPC title

• H01B13/22

  Sheathing; Armouring; Screening; Applying other protective layers (H01B13/32 takes precedence) · CPC title

• H01B1/02

  mainly consisting of metals or alloys · CPC title