HIGH VOLTAGE BUSHING

• US 20100051306A1
• Filed: 10/31/2007
• Published: 03/04/2010
• Est. Priority Date: 10/31/2006
• Status: Abandoned Application

• Current Assignee: ABB Research Ltd. (ABB Ltd.)
• Original Assignee: ABB Research Ltd. (ABB Ltd.)
• Inventors: Widlund, Ola, Törnkvist, Christer
• Application Number:
  US12/447,960
• Publication Number:
  US 20100051306A1
• Time in Patent Office: Days
• US Class Current: 174/15.300
• CPC Class Codes: H01B 17/28 Capacitor type
• CPC Class Codes: H01B 17/54 having heating or cooling devices
• CPC Class Codes: H01B 7/428 Heat conduction

Abstract

A high voltage bushing for transferring AC or DC high voltage and current. The bushing includes an electrically connectable electrical conductor, an insulator housing enclosing the conductor, and a space filled with an electrically insulating gas in between said insulator housing and said conductor. The electrical conductor is coated with a surface layer of a material having a thermal emissivity substantially larger than a thermal emissivity of the conductor.

Claims

1. A high voltage bushing for transferring AC or DC high voltage and current, said bushing comprising:

an electrically connectable electrical conductor,

an insulator housing enclosing said conductor, and

a space filled with an electrically insulating gas in between said insulator housing and said conductor,

wherein said electrical conductor is coated with a surface layer of a material having a thermal emissivity substantially larger than a thermal emissivity of the conductor.

2. The high voltage bushing according to claim 1, wherein said surface layer has a thermal emissivity which is at least 3 times larger than the thermal emissivity of the conductor.

3. The high voltage bushing according to claim 1, wherein said surface layer has a thermal emissivity which is at least 5 times larger than the thermal emissivity of the conductor.

4. The high voltage bushing according to claim 1, wherein said surface layer has a thermal emissivity which is at least 7 times larger than the thermal emissivity of the conductor.

5. The high voltage bushing according to claim 1, wherein said surface layer substantially comprises a metal.

6. The high voltage bushing according to claim 1, wherein said surface layer substantially comprises an oxide.

7. The high voltage bushing according to claim 6, wherein said surface layer substantially comprises an aluminum oxide.

8. The high voltage bushing according to claim 1, wherein said surface layer comprises anodized aluminum.

9. The high voltage bushing according to claim 1, wherein said surface layer substantially comprises an organic or semi-organic substance.