Stationary induction machine and a cable therefor

• US 7,045,704 B2
• Filed: 04/19/2001
• Issued: 05/16/2006
• Est. Priority Date: 04/28/2000
• Status: Expired due to Fees

• Current Assignee: ABB AB (ABB Limited)
• Original Assignee: ABB AB (ABB Limited)
• Inventors: Areskoug, Claes
• Primary Examiner(s): Nguyen, Chau N.
• Application Number:
  US10/258,740
• Publication Number:
  US 20030164245A1
• Time in Patent Office: 1,853 Days
• Field of Search: 174/15.1, 174/47, 174/15.7, 174/15.6, 219/677
• US Class Current: 174/15.1
• 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, and a cable for such an induction machine, including a winding including an elongate, flexible cable, having an electric lead, 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. The lead is in a form of a tube and surrounds a continuous channel for circulation of the coolant. The cable includes a cooling tube of a polymer material that is arranged in the lead and forms the channel.

Claims

1. A stationary induction machine comprising:

at least one winding, including an elongate, flexible cable, having an electric lead; and

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

wherein the lead is in a form of a tube and surrounds a continuous channel for circulation of said coolant, and

wherein the cable includes a cooling tube of a polymer material arranged in the lead and forming said channel.

2. An induction machine as claimed in claim 1, wherein the polymer material comprises cross-linked polyethylene.

3. An induction machine as claimed in claim 1, wherein a diffusion layer impermeable to the coolant is arranged on an envelope surface of the cooling tube.

4. An induction machine as claimed in claim 3, wherein the diffusion layer consists of polyethylene-laminated aluminum tape.

5. An induction machine as claimed in claim 1, wherein the coolant is a mixture of glycol and water.

6. An induction machine as claimed in claim 1, wherein the cable includes a fixed electrically insulating layer of a polymer material surrounding the lead.

7. An induction machine as claimed in claim 1, wherein the channel occupies a central part of the cable.

8. An elongate, flexible cable comprising:

an electric lead and a fixed electrically insulating layer of a polymer material surrounding the lead, which cable is configured to form a winding in a stationary induction machine, in which a cooling device is arranged, with aid of a coolant, to displace excess heat generated in the lead during operation of the induction machine, which lead is in a form of a tube and surrounds a continuous channel for circulation of said coolant, wherein the cable includes a cooling tube of polymer material arranged in the lead and forming said channel.

9. A cable as claimed in claim 8, wherein the polymer material comprises cross-linked polyethylene.

10. A cable as claimed in claim 8, wherein a diffusion layer impermeable to the coolant is arranged on an envelope surface of the cooling tube.

11. A cable as claimed in claim 8, wherein the channel occupies a central part of the cable.