HIGH VOLTAGE VALVE GROUP WITH INCREASED BREAKDOWN STRENGTH

• US 20090266605A1
• Filed: 06/20/2006
• Published: 10/29/2009
• Est. Priority Date: 06/20/2006
• Status: Abandoned Application

• Current Assignee: ABB Power Grids Switzerland AG (Hitachi, Ltd.)
• Original Assignee: ABB Research Ltd. (ABB Limited)
• Inventors: Wu, Dong, Ming, Li
• Application Number:
  US12/305,999
• Publication Number:
  US 20090266605A1
• Time in Patent Office: Days
• US Class Current: 174/5.R
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: H05K 7/1432 specially adapted for power drive units or power converters
• CPC Class Codes: H05K 7/14339 specially adapted for high voltage operation
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A high voltage assembly including a valve group and a shield connected to the valve group. A resistor is connected between the shield and the valve group The assembly provides an increased breakdown strength and DC withstand level.

Claims

1. A high voltage assembly, comprising:

a valve group,

a shield connected to said valve group, and

a connection resistance connected between said shield and said valve group, whereby increased breakdown strength and DC withstand level are obtained.

2. The high voltage assembly according to claim 1, wherein said connection resistance comprises a resistor.

3. The high voltage assembly according to claim 2, wherein said resistor has a resistance value within the range of 2 MΩ

-40 MΩ

.

4. The high voltage assembly according to claim 1, wherein said valve group comprises thyristor valves arranged in a twelve pulse valve group.

5. The high voltage assembly according to claim 1, wherein said connection resistance has a controlled capacitance.

6. The high voltage assembly according to claim 5, wherein said controlled capacitance is much larger than the capacitance between the shield and an adjacent wall.

7. The high voltage assembly according to claim 6, wherein said controlled capacitance is about one thousand times larger than capacitance between the shield and an adjacent wall.

8. The high voltage assembly according to claim 1, wherein said connection resistance comprises a water resistor.

9. The high voltage assembly according to claim 1, wherein said shield is comprises a metallic shield.

10. The high voltage assembly according to claim 1, further comprising

a plurality of shields,

a plurality of valve groups, and

a connection resistance connected between each shield and a respective valve group.

11. The high voltage assembly according to claim 1, wherein said high voltage assembly is a high voltage power converter.