Shielding arrangement for high voltage equipment

Patent metadata

Field	Value
Publication number	US-11240945-B2
Application number	US-201817278180-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Sep 27, 2018
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A shielding arrangement can be provided for a piece of high voltage equipment spaced from a neighboring object. The piece of high voltage equipment has a first electric potential and the neighboring object has a second electric potential. The shielding arrangement includes a resistor, a shield element for connection to the high voltage equipment via the resistor, and a capacitor connected in parallel with the resistor. A resistance of the resistor and a capacitance of the capacitor together define a time constant in a range of 10 μs-50 ms.

First claim

The invention claimed is:

1. A shielding arrangement for a piece of high voltage equipment spaced from a neighboring object, wherein the piece of high voltage equipment has a first electric potential and the neighboring object has a second electric potential, the shielding arrangement comprising:
a resistor;
a shield element for connection to the piece of high voltage equipment via the resistor; and
a capacitor connected in parallel with the resistor, wherein a resistance of the resistor and a capacitance of the capacitor together define a time constant in a range of 10 μs-50 ms.

2. The shielding arrangement according to claim 1 , wherein the time constant is in the range 0.1-15 ms.

3. The shielding arrangement according to claim 1 , wherein the resistance of the resistor is in the range 0.1-12 MΩ.

4. The shielding arrangement according to claim 1 , wherein the capacitance of the capacitor is in the range 0.1-10 nF.

5. The shielding arrangement according to claim 1 , wherein the shield element comprises a curved section covering a corner of the piece of high voltage equipment.

6. The shielding arrangement according to claim 1 , wherein the first electric potential is an operating potential of the piece of high voltage equipment and the second electric potential is a ground potential.

7. The shielding arrangement according to claim 1 , wherein the neighboring object is an enclosure enclosing the piece of high voltage equipment.

8. The shielding arrangement according to claim 1 , wherein the capacitor has two plates separated by a gap and wherein the resistor is separated from the gap.

9. The shielding arrangement according to claim 1 , wherein the resistor and the capacitor are separate components.

10. The shielding arrangement according to claim 1 , wherein the resistance and the capacitance have been selected such that a supply of electric charges to a corona or streamer discharge is restricted by the resistor and the capacitor.

11. A converter station comprising:
a converter configured to convert between an alternating current and a direct current, the converter comprising a plurality of converter valves having a first electric potential;
an enclosure enclosing the converter, the enclosure having a second electric potential; and
a shielding arrangement located between the enclosure and at least one converter valve of the converter valves, the shielding arrangement comprising a shield element connected to the at least one converter valve via a resistor and a capacitor that are connected in parallel, wherein a resistance of the resistor and a capacitance of the capacitor together define a time constant in a range of 10 μs-50 ms.

12. The converter station according to claim 11 , wherein the time constant is in the range 0.1-15 ms.

13. The converter station according to claim 11 , wherein the resistance of the resistor is in the range 0.1-12 MΩ.

14. The converter station according to claim 11 , wherein the capacitance of the capacitor is in the range 0.1-10 nF.

15. The converter station according to claim 11 , wherein the time constant is in the range 0.1-15 ms, wherein the resistance of the resistor is in the range 0.1-12 MΩ, and wherein the capacitance of the capacitor is in the range 0.1-10 nF.

16. The converter station according to claim 11 , wherein the shield element comprises a curved section covering the at least one converter valve of the plurality of converter valves.

17. The converter station according to claim 11 , wherein the first electric potential is an operating potential of the converter valves and the second electric potential is a ground potential.

18. The converter station according to claim 11 , wherein the capacitor has two plates separated by a gap and wherein the resistor is separated from the gap.

19. The converter station according to claim 11 , wherein the resistor and the capacitor are separate components.

20. The converter station according to claim 11 , wherein the resistance and the capacitance have been selected such that a supply of electric charges to a corona or streamer discharge is restricted by the resistor and the capacitor.

Assignees

• Hitachi Energy Switzerland Ag

Inventors

• Larsson Mats
• Wu Dong
• Arevalo Liliana
• Tornkvist Christer

Classifications

• H05K9/002 Primary

  with localised screening · CPC title

• H05K7/14339 Primary

  specially adapted for high voltage operation · CPC title

• H02B11/26

  Arrangements of fuses, resistors, voltage arresters or the like · CPC title

• H01B5/004

  for protection against corona · CPC title

• H02B7/06

  Distribution substations, e.g. for urban network (H02B7/01 takes precedence) · CPC title