Stationary induction machine and a cable therefor

• US 20030164245A1
• Filed: 04/14/2003
• Published: 09/04/2003
• Est. Priority Date: 04/28/2000
• Status: Active Grant

• Current Assignee: ABB AB (ABB Limited)
• Original Assignee: ABB AB (ABB Limited)
• Inventors: Areskoug, Claes
• Granted Patent: US 7,045,704 B2
• Time in Patent Office: Days
• US Class Current: 174/110R
• CPC Class Codes: H01F 27/16 Water cooling
• CPC Class Codes: H01F 27/2876 Cooling cooling transformers and inductances in general H01F27/08

Abstract

A stationary induction machine including a winding (2) including an elongate, flexible cable (1), having an electric lead (7), and a cooling device, arranged, with the aid of a coolant, to divert excess heat generated in the lead during operation of the induction machine, which lead is in the form of a tube and surrounds a continuous channel (10) for the circulation of said coolant. In accordance with the invention, the cable includes a cooling tube (4) of a polymer material that is arranged in the lead and forms said channel. The invention also relates to a cable for such an induction machine.

Claims

1. A stationary induction machine including

at least one winding (2), including an elongate, flexible cable (1), having an electric lead (7), and

a cooling device, arranged, with the aid of a coolant, to divert excess heat generated in the lead (7) during operation of the induction machine,

where the lead (7) is in the form of a tube and surrounds a continuous channel (10) for the circulation of said coolant, characterized in that the cable (1) includes a cooling tube (4) of a polymer material that is arranged in the lead (7) and forms said channel (10).

2. An induction machine as claimed in claim 1, characterized in that the polymer material is cross-linked polythene.

3. An induction machine as claimed in claim 1 or 2, characterized in that a diffusion layer (5) impermeable to the coolant is arranged on the envelope surface of the cooling tube (4).

4. An induction machine as claimed in claim 3, characterized in that the diffusion layer (5) consists of polythene-laminated aluminium tape.

5. An induction machine as claimed in any one of claims 1-4, characterized in that the coolant is a mixture of glycol and water.

6. An induction machine as claimed in any one of claims 1-5, characterized in that the cable (1) includes a fixed electrically insulating layer (9) of a polymer material surrounding the lead (7).

7. An induction machine as claimed in any one of claims 1-6, characterized in that the channel (10) occupies the central part of the cable (1).

8. An elongate, flexible cable (1) including an electric lead (7) and a fixed electrically insulating layer (9) of a polymer material surrounding the lead (7), which cable (1) is intended to form a winding (2) in a stationary induction machine, in which a cooling device is arranged, with the aid of a coolant, to displace excess heat generated in the lead (7) during operation of the induction machine, which lead (7) is in the form of a tube and surrounds a continuous channel (10) for the circulation of said coolant, characterized in that the cable (1) includes a cooling tube (4) of a polymer material that is arranged in the lead (7) and forms said channel (10).

9. A cable as claimed in claim 8, characterized in that the polymer material is cross-linked polythene.

10. A cable as claimed in claim 8 or 9, characterized in that a diffusion layer (5) impermeable to the coolant is arranged on the envelope surface of the cooling tube (4).

11. A cable as claimed in any one of claims 8-10, characterized in that the channel (10) occupies the central part of the cable (1).