Switchgear driving arrangement

Abstract

A switchgear driving arrangement includes a transmission element which penetrates a wall of a housing. The transmission element is guided in a linearly movable manner in such a way as to be supported on the wall. A first guide bearing is located inside the housing. A second guide bearing is located outside the housing. An electrical switchgear is also provided.

Claims

1. A switchgear drive arrangement, comprising: a housing having a wall, said wall having a reversibly deformable section; a guide bearing having a bearing sleeve, said bearing sleeve engaging around said reversibly deformable section; a transmission element for transmitting a movement through said wall of said housing, said transmission element being guided and supported for linear displacement on said wall of said housing and said transmission element being displaceable in sliding contact with said bearing sleeve and being supported for linear movement by said bearing sleeve; said bearing sleeve protecting said reversibly deformable section and said transmission element against external mechanical influences; and a spacer disposed between said bearing sleeve and said reversibly deformable section along at least part of a length of said reversibly deformable section.

2. The switchgear drive arrangement according to claim 1, wherein said transmission element is guided and supported within said housing for linear displacement.

3. The switchgear drive arrangement according to claim 1, wherein said transmission element is guided and supported outside said housing for linear displacement.

4. The switchgear drive arrangement according to claim 1, which further comprises a phase conductor of a switchgear, and a first guide bearing disposed on said phase conductor.

5. The switchgear drive arrangement according to claim 4, which further comprises a fluid-tight section for closing an opening in said wall, and a second guide bearing guiding said fluid-tight section.

6. The switchgear drive arrangement according to claim 5, wherein said first guide bearing and said second guide bearing stabilize a linear movement of said transmission element in alignment with one another.

7. The switchgear drive arrangement according to claim 5, wherein said first guide bearing and said second guide bearing are electrically insulated from one another.

8. The switchgear drive arrangement according to claim 4, wherein said guide bearing having a said bearing sleeve is a second guide bearing.

9. The switchgear drive arrangement according to claim 1, wherein said spacer is displaceable relative to said bearing sleeve.

10. The switchgear drive arrangement according to claim 1, wherein said housing is a pressure vessel.

11. The switchgear drive arrangement according to claim 1, which further comprises a switching point of a switchgear being disposed within said housing.

12. The switchgear drive arrangement according to claim 11, wherein said switching point is at least partially supported against said housing.

13. An electrical switchgear, comprising: switching contact pieces configured to be driven relative to one another; and a switchgear drive arrangement according to claim 1 for driving one of said switching contact pieces.

Description

(1) An exemplary embodiment of the invention is shown in a schematic drawing and then described below.

BRIEF DESCRIPTION OF THE SINGLE VIEW OF THE DRAWING

(2) The FIGURE shows a section through a switchgear drive arrangement and also a switchgear which comprises the switchgear drive arrangement.

DESCRIPTION OF THE INVENTION

(3) The switchgear drive arrangement has a transmission element 1. The transmission element 1 is mounted in a linearly displaceable manner. In this case, the transmission element 1 passes through a housing 2. The housing 2 is embodied as a fluid-tight pressure vessel, wherein a switching point 3 is arranged in the interior of the housing 2. In the is present case, the switching point 3 is designed as a vacuum tube which is formed in a substantially rotationally symmetrical manner, wherein a first switching contact piece 4 and a second switching contact piece 5 protrude into the interior of the vacuum tube at the end side. The two switching contact pieces 4, 5 are oriented coaxially in relation to one another, wherein the first switching contact piece 4 is arranged in an axially movable manner. The second switching contact piece 5 is arranged in a stationary manner. In order to fix the switching device in a stationary manner within the housing 2, a first subsection 6 and also a second subsection 7 of a phase conductor run are connected to the switching point 3 at a fixed angle. In this case, the first subsection 6 is electrically conductively connected to the first switching contact piece 4 and the second subsection 7 is electrically conductively connected to the second switching contact piece 5. A supporting insulator 8 is arranged on the inner wall of the housing 2 for the purpose of supporting the second subsection 7. The supporting insulator 8 holds the second subsection 7 at a fixed angle relative to the housing 2. The end side of the switching device 3, on which end side the second switching contact piece 5 is arranged, is secured at a fixed angle relative to the housing 2 by means of the connection of the second subsection 7 of the phase conductor. The first subsection 6 is of substantially hollow-cylindrical design and supports the end side of the switching device 3, on which end side the first switching contact piece 4 is arranged in a movable manner. In order to stabilize the first subsection 6 and therefore also the switching point 3, a hollow post insulator 9 is arranged on the first subsection 6, specifically at that end which is averted from the switching point 3. Therefore, an electrically insulating connection between an inner wall of the housing 2 and the first subsection 6 is provided by means of the hollow post insulator 9. A branch 10, by means of which the phase conductor is guided outward through a wall of the housing 2 starting from the first subsection 6, is arranged on the lateral surface of the first subsection 6. For the purpose of electrically insulated guidance of the branch 10, a lateral surface-side connection piece 11 is blocked by a disk insulator 12 through which the branch 10 passes in a fluid-tight manner. Further assemblies, such as an outdoor bushing or further housing assemblies for example, can now be flange-connected to the lateral surface-side connection piece 11. Analogously to conducting the branch 10 out through a wall of the housing 2, the second subsection 7 is electrically insulated by a further lateral surface-side connection piece 11a and also a further disk insulator 12a and guided out of the interior of the housing 2 to the outside in a fluid-tight manner. In the present case, provision is made for the housing 2 to be formed substantially from an electrically conductive material to which ground potential is applied.

(4) The transmission element 1 passes through the hollow post insulator 9 and continues within the first subsection 6 of the phase conductor as far as to the first switching contact piece 4. In this case, the transmission element 1 is composed of a plurality of sections. The transmission element 1 has, for example, an electrically insulating tubular section 1a. The electrically insulating tubular section 1a is connected, by way of its end which is averted from the switching point 3, to a disk-like section 2a of the transmission element 1. The disk-like section 2a closes is an opening in the housing 2 by means of a so-called set of folding bellows 13 (reversibly deformable section). The set of folding bellows 13 is closed, at one of its end sides, by the disk-like section 2a in a fluid-tight manner. At its other end, the set of folding bellows 13 is connected at the end side to a fixed-angle section of the housing 2 (so as to engage around the opening) in a fluid-tight manner. The transmission element 1 continues beyond the disk-like section 2a outside the housing in a drive rod 14. At an end of the transmission element 1 that faces the switching device 3, the transmission element 1 has a contact-pressure spring 15 which is arranged in a spring housing 16. The spring housing 16 is provided with a guide collar 17, so that the spring housing 16 of the transmission element 1 is guided in a sliding manner centrally within the hollow-cylindrical recess of the first subsection 6 of the phase conductor. In addition, a contact disk 18 is arranged in the course of the transmission element 1. The contact disk 18 is electrically conductively connected to the first switching contact piece 4. The contact disk 18 slides in the same hollow-cylindrical recess of the first subsection 6 as the guide collar 17 of the spring housing 16. If required, an electrical contact-connection can be made both by means of the contact disk 18 and also additionally by means of the spring housing 16 in order to ensure a movable electrically conductive contact-connection between the first switching contact piece 4 and the phase conductor, which is to be interrupted, by means of the first subsection 6.

(5) The outer lateral surface of the folding bellows 13 is surrounded by a bearing sleeve 19. The bearing sleeve 19 is arranged outside the housing 2. The bearing sleeve 19 is receives, in its hollow-cylindrical recess, the disk-like section 2a, so that said disk-like section is guided in a linearly displaceable manner. A spacer 20 is arranged in is the annular gap which is formed on the inner lateral surface side in the bearing sleeve 19 and the outer lateral surface side on the periphery of the folding bellows 13. In the present case, the spacer 20 is of substantially hollow-cylindrical design, wherein said spacer is fixed to the disk-like section 2a at the end side. In order to reduce the friction on the outer periphery, annular shoulders which run in an axially spaced apart manner are arranged on the spacer 20. An additional spacer 21 is arranged in the interior of the housing 2 between the inner wall of the folding bellows 13 and the electrically insulating tubular section 1a. The additional spacer 21 is connected to the housing 2 in a stationary manner, wherein the axial extent both of the spacer 20 and also of the additional spacer 21 is selected in such a way that overlapping of the two spaces 20, 21 (with the interposition of the folding bellows 13) is always ensured. Owing to the spacers 20, 21, guidance of the folding bellows 13 is ensured in the event of deformation of said folding bellows.

(6) A first guide bearing for the transmission element 1 is provided within the first subsection 6 by means of the guide collar 17 there and, respectively, the contact disk 18. The first guide bearing is therefore arranged on a phase conductor of the switchgear. The first guide bearing is arranged within the housing 2. A second guide bearing is formed on the bearing sleeve 19 within which the disk-like section 2a is guided in a displaceable manner. The disk-like section 2a of the transmission element 1 is guided on the second guide bearing outside the housing 2. The guide is bearings are each arranged, at the end side, on the electrically insulating tubular section 1a. The bearing sleeves both of the first guide bearing and also of the second guide bearing are oriented in a stationary manner in relation to the housing 2. In this case, the two guide bearings are oriented in alignment with one another in the axial direction, so that a linear movement of the transmission element 1 (in particular of the electrically insulating section/electrically insulating tubular section 1a) is guided both inside the housing 2 and also outside the housing 2. In the event of a switch-on process (the FIGURE shows a switched-off state of the switching point 3), a movement is output from the drive device which is coupled to the transmission element 1, wherein a linear movement of the transmission element 1 takes place, as a result of which the first switching contact piece 4 moves closer to the second switching contact piece 5. In this case, the transmission element 1 is linearly guided both by means of the first guide bearing and also by means of the second guide bearing. Contact being made between the first switching contact piece 4 and the second switching contact piece 5 results in excessive travel of the drive device, as a result of which the contact-pressure spring 15 is compressed. Therefore, starting from the transmission element 1, a contact force is generated between the first switching contact piece 4 and the second switching contact piece 5. The phase conductor is switched on. During the switch-on process, the set of folding bellows 13 is compressed, wherein the overlap between the two spacers 20, 21 increases, as a result of which increased guidance of the folding of the set of folding bellows 13 takes place.

(7) In the event of a switch-off process, the direction of the is movement of the transmission element 1 is reversed. In this case, the contact-pressure spring 15 is initially relieved of tension, this being followed by the first switching is contact piece 4 being moved away from the second switching contact piece 5 until the switch-off position is reached.

(8) The interior of the housing 2 can be filled with an electrically insulating fluid under excess pressure. This electrically insulating fluid is preferably present in gaseous form in the interior of the housing 2. By way of example, sulfur hexafluoride, fluoroketone, fluoronitrile, carbon dioxide, nitrogen, oxygen and other electronegative substances, preferably in a mixture, have proven themselves as electrically insulating fluids. The switchgear drive arrangement shown in the FIGURE and, respectively, the switching device 3 shown can be used, for example, in a so-called gas-insulated switchgear installation or else in an outdoor switchgear. In addition to the single-pole electrical insulation shown in FIG. 1, variants with multiple-pole electrical insulation, that is to say with a plurality of phase conductors, which are electrically insulated from one another, arranged within one and the same housing 2, can also be used.