HK1168466B - Retaining element for switchgear - Google Patents

Description

Switchgear rack

Technical Field

The invention relates to a support for a switchgear having a circuit breaker or load switch, a disconnector and an earthing switch.

Background

Switchgear comprising circuit breakers or load switches, disconnectors and earthing switches are known from the well-known prior art. In such switchgear, the switches are fixed to the housing member of the switchgear independently of each other.

Disclosure of Invention

The object of the invention is to provide a support for a switchgear assembly, which makes it possible to realize a switchgear assembly having a compact design and saving space.

The object is achieved according to the invention by a support for a switchgear having a circuit breaker or load switch, a disconnector and an earthing switch, which support carries the contacts of a circuit breaker, disconnector and earthing switch, respectively, which support is made of an insulating material, and which has fixing means for fixing to the switchgear.

With such a carrier, a compact and space-saving switching device is achieved, since the contacts of the circuit breaker, disconnector and earthing switch supported by the carrier can be arranged in a space-saving manner next to one another by means of the carrier consisting of an insulating material. Within the framework of the invention, supported means either the contact is fastened to the carrier, for example by screws, or the contact, for example the moving contact of a circuit breaker or a disconnector, is guided for movement on the carrier, for which purpose the moving contact extends through a bore of the carrier and is guided for movement on the carrier.

According to a further development of the invention, the support has a double U-shape. The double U-shape, which comprises a first U-shape with its legs extending in one direction and a second U-shape with its legs extending opposite from the base of the first U-shape, ensures on the one hand a stable construction of the support and on the other hand a creepage distance is formed by the two legs of the double U-shape, which ensures a higher dielectric strength of the support with respect to the conducting parts around the switchgear.

According to a further development of the invention, the support has a brace between the legs of each U. Such a cross brace results in a mechanically more stable support and thus also allows a compact construction.

In a further development of the invention, the contacts of the circuit breaker, the disconnector and the earthing switch, which are supported on the carrier, form a row. Such a mounting, i.e. the circuit breaker, the disconnector and the earthing switch, which are fixed to or guided on the carrier, form a row, or in other words the contacts which are arranged one behind the other, results in a compact and space-saving construction of the carrier and thus of the switchgear, in terms of the lateral dimensions of the carrier.

The invention also relates to a multi-phase switching device, each phase having a carrier according to the above-described embodiment.

Drawings

The invention is explained in detail below by way of example with reference to the accompanying drawings. Wherein:

fig. 1 shows a partial perspective view of a polyphase switching device with a support according to the invention;

FIG. 2 shows a cross-sectional view of a stent according to the present invention; and

fig. 3 shows a side view of a switchgear with a support according to the invention.

Detailed Description

Fig. 1 shows a partial perspective view of a three-phase switchgear 1, in which a three-phase circuit breaker 8, a three-phase disconnector 9 and a three-phase earthing switch 10 are arranged between bus terminals 2, 3 and 4 and cable outlet terminals 5, 6 and 7. Only the components of one phase are shown and described in detail in the figures, since the respective components of the three phases of the switch are identical. The current path of the switching device 1 is explained in more detail below with the aid of phase L1, the switching device wall of the switching device 1 not being shown here for reasons of clarity. Via a bus bar, not shown in the figure, a current path is formed via the bus bar terminal 2, which extends through the wall feedthrough 11 to the disconnector fixed contact 12, the fixed contact 12 together with the disconnector moving contact 13 forming the disconnector 9. The disconnecting switch moving contact is connected in an electrically conductive manner via a connecting device 14 to a disconnector moving contact 15 of a vacuum tube switch 16 and to a grounding switch fixed contact 17. The interrupter moving contact 15 of the vacuum interrupter 16 forms a circuit breaker 8 together with a circuit breaker fixed contact 18, wherein the circuit breaker fixed contact 18 is connected to the cable outlet terminal 5 via a wall mount 19. The earthing switch fixed contact 17 constitutes the earthing switch 10 together with the earthing switch moving contact 20.

The disconnector moving contact 13 of the disconnector 9 is mechanically connected to the disconnector drive shaft 21 so that a drive movement can be introduced into the disconnector moving contact 13 by means of a disconnector drive, not shown in the figure, for opening or closing the disconnector 9, constituting an isolation distance of the bus terminal areas with respect to the dielectrically insulated cable outlet areas. The circuit breaker moving contact 15 is connected to a circuit breaker actuating shaft 23 via a circuit breaker actuating rod 22 in order to introduce an actuating movement into the circuit breaker moving contact 15, so that the circuit breaker 8 can be actuated via the circuit breaker actuating shaft 23. The earthing switch moving contact 20 is mechanically connected to an earthing switch drive shaft 24 in order to create a drive movement in the earthing switch moving contact 20 by means of the earthing switch drive shaft 24 in order to close or establish a connection to the earthing switch fixed contact 17, so that, for example, the cable outlet terminal area of the cable outlet terminals 5, 6 and 7 can be earthed when the disconnector 9 is opened.

Thus, when the earthing switch 10 is open and the circuit breaker 8 is closed and the disconnector 9 is closed, current can flow between the bus terminal 2 and the cable outlet terminal 5. The circuit breaker 8 is intended, for example, to be switched on in the event of a short circuit in the transmission system, and the disconnector 9 is intended for dielectric separation between the bus terminal 2 and the cable outlet terminal 5, wherein the grounding of the cable outlet terminal can be effected by means of the grounding switch 10 when the disconnector 9 is open, for example, for carrying out maintenance work.

Here, the disconnector moving contact 13, the disconnector moving contact 15 and the earthing switch fixed contact 17 are supported on a carrier 25, and further carriers 26 and 27 are provided for the phases L2 and L3. The bracket 25 here has a double U-shape comprising in this embodiment upwardly extending side legs 28 and 29, downwardly extending side legs 30 and 31 and cross braces 32 and 33. The legs 28, 29, 30 and 31 and the braces 32 and 33 serve for mechanical stabilization of the support 25 and for dielectric insulation or for establishing a creepage distance through the support 25, the support 25 being composed of an insulating material. The holder 25 furthermore has fastening means 34, 35, 36 and 37, in the form of holes in the present exemplary embodiment, by means of which the holder 25 is fastened to a switchgear wall, not shown in the figures, of the switchgear 1, for example, by means of screws that can be attached to bent edges of the mounting holes.

The earthing switch fixed contact 17 is fixed or screwed to the support 25, whereas the circuit breaker moving contact 15 and the disconnector moving contact 13 are supported on the support by means of a wall-through-device through the support 25 and guided in movement on the support.

Fig. 2 shows a cross section of a support 25 according to the invention with a double U-shape, which is composed of legs 28 and 29 and legs 30 and 31 and crossbars 32 and 38, which extend not only in the upper U-shape but also in the lower U-shape between legs 28 and 29 or legs 30 and 31.

Fig. 3 shows a side view of the switchgear 1 from fig. 1, in which the side walls 39 and 40 of the switchgear 1, the upper and lower walls 41 and 42 of the switchgear 1, including the switches installed therein as has been described with reference to fig. 1, and including the carrier 25 according to the invention, the earthing switch fixed contact 17 being fixed and thus supported on the carrier 25, and the circuit breaker moving contact 15 and the disconnector moving contact 13 being guided and thus supported on the carrier. The support 25 is fastened by means of the fastening devices 34 and 36 to the side walls 39 and 40 of the switchgear 1, in the present exemplary embodiment to the bent edges of the side walls 39 and 40, by means of screws which are not shown in the figures. In other words, the bracket extends as a cross member from one side wall of the switchgear to the other side wall. Furthermore, fig. 3 shows a connecting device 14 in the form of a flexible conductive strip, which is provided for the electrically conductive connection between the earthing switch fixed contact 17, the disconnector moving contact 15 and the disconnector moving contact 13 and by means of which a current path is formed between the bus terminal 2 and the cable outlet terminal 5 when the earthing switch 10 is open and the disconnector 9 is closed and the disconnector 8 is closed, and by means of which the cable outlet terminal 5 can be connected to ground via the connecting device 14 when the disconnector is open and the earthing switch 10 is closed and the disconnector 8 is closed. For this purpose, the connecting device 14 has two flexible sections 43 and 44, which are electrically conductively connected to the circuit breaker moving contact 15 and, on the other hand, to the earthing switch fixed contact 17 or to the disconnecting switch moving contact 13.

List of reference numerals

1 switching device

2. 3, 4 bus terminal

5. 6, 7 cable outlet terminal

8 breaker

9 isolating switch

10 ground switch

11 wall penetrating device

12 fixed contact of isolating switch

13 isolating switch moving contact

14 connecting device

15 moving contact of circuit breaker

16 vacuum tube switch

17 fixed contact of grounding switch

18 fixed contact of circuit breaker

19 wall-penetrating support

20 earthing switch moving contact

21 isolating switch driving shaft

22 circuit breaker driving rod

23 circuit breaker drive shaft

24 earthing switch driving shaft

25. 26, 27 support

28. Edges 29, 30 and 31

32. 33 horizontal support

34. 35, 36, 37 fixing device

38 horizontal support

39. 40 side wall

41 upper wall

42 lower wall

43. 44 flexible segment

L1, L2, L3 phases

Claims (4)

1. A rack (25, 26, 27) for a switchgear (1), the switchgear (1) having a circuit breaker or load switch (8), a disconnector (9) and an earthing switch (10), the rack (25, 26, 27) supporting the contacts (13, 15, 17) of the circuit breaker (8), disconnector (9) and earthing switch (10), respectively, the rack being constructed of an insulating material and having fastening means (34, 35, 36, 37) for fastening to the switchgear (1), the rack (25, 26, 27) having a double U-shape comprising a first U-shape with its legs extending in one direction and a second U-shape with its legs extending opposite from the base of the first U-shape.

2. A support as claimed in claim 1, wherein the support (25, 26, 27) has a cross brace (32, 33, 38) between the legs (28, 29, 30, 31) of each U.

3. A support according to any one of the preceding claims, wherein the contacts (13, 15, 17) of the disconnector (8), disconnector (9) and earthing switch (10) supported on said support (25, 26, 27) form a row.

4. A multiphase switching installation (1) having one rack (25, 26, 27) according to one of claims 1 to 3 per phase (L1, L2, L3).