ELECTRICAL DEVICE AND POWER CONVERTER ASSEMBLY

Abstract

An electric high-voltage device includes a fluid-tight housing, a high-voltage component arranged in the housing, and an insulating liquid in the housing in order to electrically insulate the high-voltage component. The high-voltage component is a passive current collector which is configured to at least temporarily conduct a current of at least 1 kA. There is also described a power converter assembly with the high-voltage device.

Claims

1-13. (canceled)

14. An electrical high-voltage device, comprising: a fluid-tight housing; a high-voltage component disposed in said housing, said high-voltage component being a passive current collector apparatus configured to conduct, at least temporarily, a current of at least 1 kA; and an insulating liquid in said housing for electrically insulating said high-voltage component.

15. The high-voltage device according to claim 14, wherein said high-voltage component is completely surrounded by said insulating liquid.

16. The high-voltage device according to claim 14, wherein said insulating liquid is a synthetic ester.

17. The high-voltage device according to claim 14, wherein said high-voltage component is a high-voltage arrester for discharging currents of at least 1 kA.

18. The high-voltage device according to claim 17, wherein said high-voltage arrester is a metal oxide collector.

19. The high-voltage device according to claim 18, wherein said high-voltage arrester is a varistor comprising elements selected from the group consisting of ZnO and SiC.

20. The high-voltage device according to claim 18, wherein said high-voltage arrester comprises a plurality of discharge disks arranged in a tensioning brace.

21. The high-voltage device according to claim 14, wherein said high-voltage component is a passive filter or a braking apparatus comprising braking resistors.

22. The high-voltage device according to claim 14, wherein said high-voltage component is one of a plurality of high-voltage components, which are electrically connected in parallel and arranged together in said housing.

23. The high-voltage device according to claim 14, wherein said insulating liquid is not actively circulated.

24. The high-voltage device according to claim 14, further comprising a heat sink arranged in said housing.

25. The high-voltage device according to claim 14, further comprising at least one liquid-insulated line configured to connect said high-voltage component to electrical devices outside said housing.

26. The high-voltage device according to claim 14, wherein said housing comprises fiber-reinforced plastic.

27. A power converter assembly, comprising: a power converter having a plurality of power converter valves, disposed in a separate liquid-tight housing, which is filled with an insulating liquid; and at least one high-voltage device according to claim 14 electrically connected to said power converter valves.

Description

[0024] The invention is explained in more detail below based on an exemplary embodiment, illustrated in the FIGURE.

[0025] The FIGURE shows a schematic illustration of an exemplary embodiment of a power converter assembly according to the invention having a high-voltage device according to the invention. The high-voltage range is understood here as the range of voltages above 1 kV occurring.

[0026] The FIGURE illustrates a power converter assembly 1. The power converter assembly 1 comprises a power converter 2, which is arranged between a DC voltage network 3 and an AC voltage network 4 during operation of the power converter assembly 1. The power converter 2 is connected to the DC voltage network 3 by means of DC voltage terminal connections DC+, DC- and to the AC voltage network by means of an AC voltage terminal connection 5. The power converter 2 comprises a first power converter valve 6 and a second power converter valves 7, wherein the first power converter valve 6 is arranged between the first DC voltage terminal connection DC+ and the AC voltage terminal connection 5 and the second power converter valve 7 is arranged between the second DC voltage pole DC- and the AC voltage terminal connection 5. The two power converter valves 6 and 7 each comprise controllable semiconductor switches that preferably can be switched off.

[0027] According to the example in the FIGURE, during operation of the power converter assembly 1, an AC voltage of more than 100 kV is applied to the AC voltage side of the power converter 2.

[0028] The power converter 2 comprises a fluid-tight, in particular liquid-tight housing 8. The two power converter valves 6, 7 are accommodated in the housing 8 such that they are completely surrounded by an insulating fluid (up to the lines that are led out of the housing).

[0029] The power converter assembly 1 also comprises a high-voltage device 10 having a high-voltage component in the form of a first high-voltage arrester 11. The high-voltage device 10 is arranged on the AC voltage side of the power converter 2 and is connected to the AC voltage network 4. The high-voltage device 10 also comprises a second high-voltage arrester 12, wherein the two high-voltage arresters 11, 12 have a similar construction in the example illustrated.

[0030] The first high-voltage arrester 11 comprises a series circuit of arrester elements in the form of discharge disks 13a-131, which are arranged with one another in a tensioning brace. The series circuit of arrester elements is connected between an AC voltage terminal connection 14 of the high-voltage device 10 and a ground terminal connection 15. The two high-voltage arresters 11 and 12 are connected in a parallel circuit between the AC voltage network 4 and ground.

[0031] The high-voltage device 10 also comprises a liquid-tight housing 16, in which the two high-voltage arresters 11 and 12 are arranged. The housing 16 is filled with an insulating liquid in the form of an ester liquid 17, which is additionally used to cool the high-voltage arresters 11, 12. In this case, the insulating liquid is operated without circulation, that is to say the high-voltage device 10 does not have an apparatus for actively moving the insulating liquid within the housing 16. A heat sink 18, which is also arranged in the housing 16, is provided for improved cooling of the high-voltage arrester 11 or transporting heat away therefrom.

[0032] The connection 19 between the AC voltage terminal connection 14 of the high-voltage device 10 and the AC voltage terminal connection 5 of the power converter 2 can also be embodied as a gas-insulated or liquid-insulated line.

[0033] The power converter assembly 1 also comprises a passive filter 20 and a braking apparatus 21 comprising braking resistors, which are each accommodated in encapsulated liquid-insulated housings, which are filled with an insulating ester liquid.