Shielding arrangement for high voltage equipment
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.
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.