COOLING OF HIGH VOLTAGE DEVICES

• US 20090126965A1
• Filed: 12/22/2006
• Published: 05/21/2009
• Est. Priority Date: 12/30/2005
• Status: Active Grant

• Current Assignee: ABB Power Grids Switzerland AG (Hitachi, Ltd.)
• Original Assignee: ABB Technology Limited (ABB Limited)
• Inventors: Petrisi, Fredrik, Astrom, Urban, Svedjehed, Lars, Gustavsson, Dan, Sjoberg, Peter
• Granted Patent: US 8,669,469 B2
• Time in Patent Office: Days
• US Class Current: 174/15.300
• CPC Class Codes: H01B 17/54 having heating or cooling devices

Abstract

A high voltage bushing including an electrical conductor configured to be electrically connected to a high voltage device and configured to be connected to an external fluid cooling system, and an insulating body surrounding the electrical conductor. A method includes cooling the high voltage bushing by connecting the electrical conductor to an external fluid cooling system.

Claims

1. A high voltage bushing, comprising:

an electrical conductor configured to be electrically connected to a high voltage device and configured to be connected to an external fluid cooling system; and

an insulating body surrounding the electrical conductor.

2. The high voltage bushing according to claim 1, wherein said electrical conductor comprises a cooling duct.

3. The high voltage bushing according to claim 2, wherein said cooling duct comprises at least two separate channels, which are in fluid connection with each other at least in one point and arranged to receive circulating cooling fluid on high electric potential from said external fluid cooling system through said electrical conductor.

4. The high voltage bushing according to claim 3, wherein said cooling duct is integrated with said electrical conductor of said high voltage bushing.

5. The high voltage bushing according to claim 4, wherein said external cooling system comprises a fluid cooling system of a HVDC valve.

6. The high voltage bushing according to claim 5, further comprising:

means for transferring high voltage and current from a fluid cooled HVDC valve.

7. The high voltage bushing according to claim 5, wherein a fraction of cooling fluid of said HVDC valve cooling system is utilized for cooling said high voltage bushing.

8. The high voltage bushing according to claim 6, wherein said high voltage bushing is connectable to said fluid cooling system of said HVDC valve with said one or more fluid channels.

9. The high voltage bushing according to claim 2, wherein said cooling duct of said electrical conductor comprises a fluid pipe arranged to lead cooling fluid.

10. The high voltage bushing according to claim 1, wherein said high voltage bushing is arranged for transferring high voltage and current through at least one grounded plane to a transformer.

11. The high voltage bushing according to claim 1, wherein said electrical conductor comprises a seal impermeable to fluid at an upper end of the electrical conductor.

12. The high voltage device according to claim 11, wherein said seal is welded onto said upper end.

13. The high voltage bushing according to claim 1, wherein a temperature of said electrical conductor is kept within the range of 40°

C. to 80°

C.

14. The high voltage bushing according to claim 1, wherein a coolant in the external fluid cooling system comprises water.

15. A method for cooling a high voltage bushing comprising an insulating body surrounding an electrical conductor electrically connectable to a high voltage device, the method comprising:

cooling said high voltage bushing by connecting said electrical conductor of said high voltage bushing to an external fluid cooling system.

16. The method according to claim 15, wherein said electrical conductor comprises a cooling duct having at least two separate channels, which are in fluid connection with each other in at least one point, said method further comprising:

receiving, in said channels, circulating cooling fluid through said electrical conductor.

17. The method according to claim 15, wherein said electrical conductor is kept at a temperature within the range of 40°

C. to 80°

C.

18. The method according to claim 16, wherein a fraction of the cooling fluid of said external cooling system is utilized for cooling said high voltage bushing.

19. The method according to claim 16, wherein said fluid is water.