# US 7,612,292 B1 · Current lead using rutherford cable

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- Number: US 7,612,292 B1
- Document ID: US7612292B1
- Status: Granted
- Kind: B1
- Application number: 12/269,215
- Filed: 2008-11-12
- Granted: 2009-11-03
- Earliest claimed: 2008-08-27
- Assignees: Korea Electrotechnology Research Institute
- Inventors: Ki Deok Sim; Seok Ho Kim; Jeon Wook Cho
- Web page: https://patentgrep.com/patent/US7612292B1

## CPC

- H01B 7/306: {Transposed conductors}
- H01B 9/006: {Constructional features relating to the conductors}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

A normal conducting current lead using Rutherford cables, in which one end thereof is connected to an external power supplier and the other end thereof is connected to a superconducting current lead connected to a superconducting power apparatus operating at ultralow temperatures. The normal conducting current lead includes an insulating body, which has a cylindrical shape or a polygonal prism shape and a plurality of slots radially formed from the center thereof, and a plurality of Rutherford cables, which are inserted and fitted into the slots of the insulating body and are radially arranged so that a density of current flowing through the cross-section of the current lead is uniformly distributed.

## Claims

### Claim 1

A current lead using Rutherford cables, suitable for use as a normal conducting current lead in which one end thereof is connected to an external power supplier and the other end thereof is connected to a superconducting current lead connected to a superconducting power apparatus operating at ultra-low temperatures in order to supply current to the superconducting power apparatus, the current lead comprising:
an insulating body, which has a cylindrical shape or a polygonal prism shape and a plurality of slots radially formed from a center thereof; and
a plurality of Rutherford cables, which are inserted and fitted into the slots of the insulating body and are radially arranged so that a density of current flowing through a cross-section of the current lead is uniformly distributed.

### Claim 2 (depends on 1)

The current lead according to claim 1, wherein the Rutherford cables are formed in a bar shape by subjecting a plurality of wire strands respectively covered with an insulating coating to helical twisting and then compression.

### Claim 3 (depends on 2)

The current lead according to claim 2, wherein the wire strands are formed of copper.

### Claim 4 (depends on 2)

The current lead according to claim 2, wherein the insulating body is formed of fiberglass reinforced plastics.

### Claim 5 (depends on 1)

The current lead according to claim 1, wherein the insulating body is formed of fiberglass reinforced plastics.

### Claim 6

A current lead using Rutherford cables, which has a large capacity, comprising:
an insulating body, which has a cylindrical shape or a polygonal prism shape and a plurality of slots radially formed from a center thereof; and
a plurality of Rutherford cables, which are inserted and fitted into the slots of the insulating body and are radially arranged so that a density of current flowing through a cross-section of the current lead is uniformly distributed.

### Claim 7 (depends on 6)

The current lead according to claim 6, wherein the Rutherford cables are formed in a bar shape by subjecting a plurality of wire strands respectively covered with an insulating coating to helical twisting and then compression.

### Claim 8 (depends on 7)

The current lead according to claim 7, wherein the wire strands are formed of copper.

### Claim 9 (depends on 7)

The current lead according to claim 7, wherein the insulating body is formed of fiberglass reinforced plastics.

### Claim 10 (depends on 6)

The current lead according to claim 6, wherein the insulating body is formed of fiberglass reinforced plastics.