DE19912835A1 - Withdrawable type electrical switchgear for medium voltage supply, comprises switch terminals which can be retracted relative to busbar and cable terminals - Google Patents

Abstract

The switch terminals (5) are so designed that they can be retracted relative to the busbar and cable terminals (6) and only engage with those terminals after the connections (45,46) to the control and protection equipment have been made

Description

The present invention relates in particular to an electrical switchgear others for medium voltages, i.e. nominal voltages in the range greater than 1 KV up to less than 52 KV, with at least one in a slot in a frame usable, in particular switchgear-carrying device insert, which is provided with electrical contacts, the holder in the frame electrical counter contacts can be brought into engagement.

Switchgear of this type is used in particular where Switching, protection, separation, distribution and / or control functions to be fulfilled are. To establish contact between the devices of an On pushes and busbars held in the frame, connecting contacts or the like, the entire slot is toward the collector rails or connecting contacts moved to thereby the required Chen electrical connections. Such a switchgear is known from DE 296 01 101.0, in which one is attached to the device insert brought and on the frame supportable insertion aid is provided to insert the device insert and close in the contact position fix. This is relatively easy to do with the slide-in aid.

However, a problem arises with such switchgear in which before Contacting the electrical contacts with the counter contacts in the Frame, i.e. before inserting the device insert, a tax office device between the device insert and the insert compartment  got to. Since the device insert has not yet been inserted, this must be done a multi-core cable can be used, which in the devices by hand insert and must be inserted into the slot. This is over of course and requires a corresponding amount of space.

The invention has for its object an electrical switchgear of the type mentioned in such a way that the insertion and Contact the device rack, especially its control con clocks is simplified.

This object is achieved in that the contacts for engagement with the counter contacts inserted into the slot of the frame pushed in relative to the device in the direction of the counter contacts are displaceable.

Due to the sliding design of the contacts relative to the device it is possible to first insert the device without contact fully inserted with the counter contacts in the slot Zen. Then only the contacts are used for contacting and not ver the entire device insert in the direction of the counter contacts pushed. Advantageously, therefore, only one has to be contacted small mass can be moved. There is also the advantage that the control contacts of the withdrawable part when the Ge is fully inserted slide-in module with the associated control socket of the slot can be contacted because the switch contacts are not yet are inevitably engaged with the counter contacts. The production the control contact can therefore take place, for example, in that a Control plug for engagement with an assigned control socket  is moved. The requirement of a manually connected tax there is no instruction.

According to one embodiment of the invention, the device insert Kon clock rails along which the contacts between a withdrawn NEN position in which the contacts with the counter contacts are not on are handle, and a contact position in which they with the Ge gene contacts are engaged, are movable. The contacting can be done in a simple and safe manner, for example with a mechanical insertion aid.

It is preferred if the contact rails are designed to be electrically conductive and for the electrical connection of the contacts to the device serve thrust. The contact rails thus serve at the same time tion of the contacts and their electrical connection, so that sepa rate electrical connection means are unnecessary.

According to a further embodiment of the invention, the counter contacts formed as electrically conductive rails, which when Ge is used insert the contact rails opposite each other and on which the Contacts for making the electrical connection with the one push frames can be pushed on. This measure in turn enables easy and safe contacting of contacts with counterparts contacts.

According to a further embodiment of the invention, the contacts are each Weil formed by two contact fingers, which are separated from each other at two contact sides of the contact rail. An is preferred  pressing means provided by which the contact fingers at least in their Contact position against the contact rail and against the counter contact rail can be pressed. The contacts have a con structurally skillful structure, with a good by the pressing means electrical contact is ensured.

According to a further embodiment of the invention, the contact fingers each loaded by a leaf spring supported on a housing. The contact fingers can thus be constructed in a structurally uncomplicated manner at the same time on the contact rail and the mating contact rail be pressed.

According to a further embodiment of the invention, the housing is as formed electrical insulating housing, which in particular made of art fabric exists. In this case, a is preferred to absorb the contact forces non-magnetizable metal ring inserted into the housing, on which supports the leaf spring. The contacts are closed due to the insulating housing Completed on the outside, so that short circuits are prevented.

According to a further embodiment of the invention, at least the are the leaf springs of a pair of contact fingers of a contact rail together men housed with these in a common housing. It can but also more contact fingers, for example two pairs of contact fingers be housed in a common housing. This will Components and installation space saved.

According to a further embodiment of the invention, the pressing means activated only in the contact position of the contact fingers. While  of moving the contact fingers along the contact rails and in the retracted position, the contact fingers are not to the Contact rail pressed. Moving the contact fingers is there relieved by.

According to a further embodiment of the invention, means are provided through which the contact fingers counter to the force of the pressing means of the contact rail can be moved away. This can reduce the effect of Leaf springs are lifted. Is preferred between the two cones provided a lever system by a contact finger pair which the two contact fingers are spread apart. This has the Advantage that both contact fingers of a couple in common in a simple manner can be detached from the contact rail.

According to a further embodiment of the invention, the lever system a dead center in the spread position. The constant spread tongue during the displacement of the contact fingers is facilitated.

According to a further embodiment of the invention, there are several, in particular all contacts of a device rack can be moved together. The This simplifies means for moving the contacts.

According to a further embodiment of the invention, the Contacts a frame, especially made of plastic, provided is engaged with all contacts to be moved via struts or can be brought into engagement. This configuration is structurally inexpensive. The frame preferably has side walls and cross struts, whereby the frame is stiffened.  

According to a further embodiment of the invention, the frame has a Engagement plate, in particular a base plate, with a cutout, in which a push rod can engage. The frame can be there by advantageously by a slide-in mechanism, in particular by below, to be moved. The impairment of the device rack and the This makes the slide-in compartment relatively small.

According to a further embodiment of the invention are preferred The pressure means are also activated and deactivated via the slide-in linkage fourth. This advantageously eliminates separate components.

According to a further embodiment of the invention, the contacts are against a shift in the direction of contact and / or in decontact direction lockable. On the one hand, this will result in incorrect operation prevents and on the other hand pushing out the device insert at egg arcing is prevented.

According to a further embodiment of the invention, the device has pushed on a control plug that is in the inserted state of the device insertion is opposite a control socket in the insertion frame and is slidable for engagement with the control socket. The manufacture of the This makes control contacts particularly simple, as well as movable ones Control lines are not required. This also eliminates the space allowed for a control line.  

An embodiment of the invention is shown in the drawing and is described below. It shows, each in a schematic Presentation,

Fig. 1 is a vertical section through a switching system in the retracted position of the contacts,

Fig. 2 is a Fig. 1 corresponding representation of the inventive SEN switchgear in contacting position,

Fig. 3 is a horizontal section through the switchgear with contacts retracted,

Fig. 4 is a representation of FIG. 3 of the switchgear according to the invention in the contacting position, and

Fig. 5 is a vertical section through a detail of a variant of the switchgear according to the invention.

Fig. 1 shows a frame 1 of a switchgear according to the invention with a slot 2 and a device slot 3 , which is mounted on a driving frame 4 and in the direction of arrow I in the slot 2 and extendable. The device insert 3 comprises electrical contacts 5 which can be contacted with counter contacts 6 in the frame 1 . Below the slot 2 , a cable connection space 7 is arranged, which can be closed by egg ne door 8 . The slot 2 is closed by a door 9 ver.

The contacts 5 are each housed in an insulating housing 10 made of plastic. The insulating housing 10 are supported by a Kunststoffrah men 11 , which is guided on the device insert 3 in the insertion direction I. By moving the support frame 11 with the housings 10 , the contacts 5 of the plug-in unit 3 can be brought into engagement with the mating contacts 6 in the frame 1 . This a handle position is shown in Fig. 2.

The support frame 11 comprises side walls 12 , between these cross struts 13 and a bottom plate 14th The bottom plate 14 and the side walls 12 are designed to stiffen the support frame 11 relatively large. The cross struts 13 between the Seitenwän the 12 carry the insulating housing 10 with the contacts 5th

How to 3 and 4 seen in the Fig., 14, the bottom plate of the support frame 11 has a recess 15. In this recess 15 engages a bolt 16 of a push rod 17 , which has a Schwenkhe bel 18 and a coupling rod 19 . The pivot lever 18 is pivoted at one end 20 on the slide-in frame 3 about an axis II and can be pivoted, for example, about 90 ° via a spindle drive. At the other end 21 of the pivot lever 18 , one end 22 of the coupling rod 19 is hinged, the other end 23 of the Bol zen 16 carries.

The bolt 16 is guided in a link guide 24 , which is seen in the cross bulkhead 47 between slot 2 and cable connection space 7 . The link guide 24 is arranged approximately in the transverse central plane of the transverse bulkhead 47 and extends substantially in a pushing direction I. At its end facing the front of the frame 1 , the link guide 24, however, is angled out at an angle to the side to form the pin 16 in one Bring disengagement with the Ausneh tion 15 in the bottom plate 14 of the support frame 11 .

Fig. 5 shows the arrangement of the contacts 5 in the insulating housings 10, where in this case two contacts 5 in a common housing 10 underweight body are introduced. The contacts 5 each comprise two contact fingers 25 made of electrically conductive material, which are arranged on two sides of an electrically conductive, electrically and mechanically connected to the slide-in frame 3 a contact rail 26 . The contact fingers 25 are each loaded by a leaf spring 27 in the direction of the contact rail 26 , wherein the leaf springs 27 are supported in a non-magnetizable metal ring 28 supported in the insulating housing 10 . That is, the metal ring 28 comprises all four leaf springs 27 , the two outer leaf springs 27 abutting the metal ring 28 , while the two inner leaf springs 27 abut one another.

The contact fingers 25 are respectively waves at both ends formed in such a shape that at each end of a contact region 29 is formed, communicating with the contact bar 26 in contact while the übri gen portions of the contact fingers 25 beab of the contact rails 26 are standet. The leaf springs 27 engage a central portion 30 between the two contact areas 29 so that they are elastically pushed against the contact rail 26 . In this way, safe contact between the contact areas 29 and the contact rails 26 can be ensured, and a very high contact pressure can be introduced via the leaf springs 27 .

The wave-like design of the two ends of each Kontaktfin gers 25 is also selected so that between the middle section 30 from the contact finger 25 , to which each leaf spring 27 engages, and the contact regions 29 , a bent away from the contact rails 26 support portion 31 is formed , Which forms a receptacle for one end of a lever system 32 , which is formed from two levers 33 and 34 , which are hingedly connected to one another with their one ends 35 , 36 , while their other ends 37 and 38 are each in a support section 31 a pair of two contact fingers 25 support a contact rail 26 . By stretching the lever system 32 , the opposing support portions 31 of a pair of con tact fingers 25 are pushed apart, so that the contact areas 29 stand out from the associated contact rail 26 . The lever system 32 is preferably designed with a dead center position of the levers 33 , 34 so that the spread position can be kept free of forces.

The stretching of all lever systems 32 takes place via a common lever mechanism which comprises one end 39 with the lever 40 mounted in the insulating housing 10 . At the other end 41 of the lever 40 , a linkage, not shown here, is articulated, which can be actuated by a lever 42 which is rotatably mounted about an axis III in the housing insert 3 . One end 43 of the lever 42 engages the linkage, not shown, while the other end 44 of the lever 42 is acted upon by the pivot lever 18 in its end position in which the support frame 11 with the insulating housing 10 and the contacts 5 in the engaged position is moved with the counter contacts 6 . The lever mechanism for actuating the pivot lever 40 is designed so that in the non-actuated position of the lever 42 shown in Fig. 3, all the lever systems 32 are stretched so that all contact areas 29 are lifted off the contact rails 26 , while during actuation supply the Lever 42 by the pivot lever 18 all lever systems 32 are kinked so that the contact areas 29 come under the contact pressure of the leaf springs 27 on the contact rails 26 to the system.

Since the actuation of the lever 42 takes place only in the end phase shown in FIG. 4 of the pivoting movement of the pivot lever 18 , that is to say in the end phase of the advance of the support frame 11 with the insulating housings 10 and the contacts 5 , the contact regions 29 are also applied Contact fingers 25 on the contact rails 26 only in the final phase of this feed movement. During the advancing movement, the contact portions 29 are against it lifted off from the contact rails 26, so that no frictional forces between the contact regions 29 and the con tact seemed 26 must be overcome. Therefore, the feed movement is possible with a correspondingly low force.

In contrast to that shown in FIG. 5, the contact regions 29 are lifted off the contact rails 26 in the retracted position of the contacts 5 . A system takes place only when the contacts 5 are so far ben that the contact fingers 25, the distance A between the contact rails 26 and the counter contacts 6 bridge. The contact areas 29 at one end of the contact fingers 25 are then under the contact pressure of the leaf springs 27 on the mating contacts 6 , while the contact areas 29 abut against the other ends of the Kontaktfin ger 25 in the region of the mating contacts 6 ends of the contact rails 26 .

The contacting of the electrical connections of a plug-in module 3 with a slide-in frame 1 is thus carried out in such a way that the device 3 is first inserted into a slot 2 . The contacts 5 of the drawer unit 3 are located according to retract the drawer unit 3 initially at a distance A to the mating contacts. 6 After the control plug 45 of the slide-in frame 3 has been connected to the control socket 46 of the frame 1 , the contacts 5 of the device slide-in 3 are moved in the insertion direction I by actuating the lever system 17 . In this case, the support frame 11 , which carries the insulating housing 10 , is moved via the lever system 17 . With the insulating housing 10 who the contact fingers 25 advanced along the contact rails 26 . The contact areas 29 of the contact fingers 25 of the contact rails ben abgeho by the action of the extended lever systems 32 26, so that there can be moving with little effort.

At the end of the feed movement, the pivot lever 18 of the Hebelsy stem 17 engages with the lever 42 , which is thereby rotated about the axis III and, via the lever mechanism (not shown), actuates the lever 40 of the insulating housing 10 in such a way that the lever systems 32 come out of their extended position are buckled so that the spreading of the contact finger 25 is ended. In this situation, shown in FIGS. 2 and 4, the contact fingers 25 have already been advanced so far in the insertion direction I that they are located above the counter contacts 6 . That is, when the lever 40 is actuated via the lever 42 , the contact areas 29 come into contact with one end of the contact fingers 25 at the contacts 6 , while the contact areas 29 at the other ends of the contact fingers 25 at the end areas of the con tact rails 26 come to rest. In this way, the distance A between the mating contacts 6 and the contact rails 26 is bridged and an electrical connection is established between the mating contacts 6 and the associated electrical connections of the device insert 3 .

The electrical connection is released in the reverse manner. By pivoting the pivot lever 18 , the He bel 42 is first brought into its initial position and thus the contact areas 29 of the contact fingers 25 again from the counter contacts 6 and the contact rails 26 are lifted. By pivoting the pivot lever 18 further, the contact fingers 25 can now be moved back into their starting position with little force. The contact fingers 25 preferably remain in their spread position after the withdrawal. After the contact fingers 25 have been completely withdrawn, the control plug 45 can then be released from the control socket 46 . Now the device insert 3 can be removed from the housing compartment 2 .

The various actuation steps are preferably protected against incorrect operation by the usual interlocks. Thus, in particular, a displacement of the contacts 5 is blocked when the control plug 45 is not inserted into the control socket 46 . Likewise, a release of the Steuerstec kers 45 from the control socket 46 is blocked as long as the contacts 5 are shifted from their starting position.

The switchgear according to the invention is very reliable and enables an electrical connection between the device insert 3 and the frame 1 with little effort. The load on the components is correspondingly low, so that they can be largely made of plastic Herge. In addition to the low mass that must be moved to establish the electrical connection, and the thereby occurring defects Tenden low friction, the switchgear according to the invention has the advantage that the control connector 45 of the drawer unit 3 can be automatically connected to the control sleeve 46 of the frame. 1 There is therefore no need to connect control lines by hand.

Because of the high level of operational safety and the low load on the components, the switchgear according to the invention is particularly suitable for medium voltages, that is to say nominal voltages between <1 KV and <52 KV. Due to the design of the switchgear according to the invention, the high forces, in particular the large contact forces required, can be absorbed at medium voltages and the large distances required between medium contacts 5 and contacts 6 can be safely bridged. As a result, the components can largely consist of plastic, so that very good insulation is possible.

Reference list

1

frame

2nd

Slot

3rd

Device rack

4th

Chassis from

3rd

5

Contact

6

Counter contact

7

Cable connection room

8th

Door of

7

9

Door of

2nd

10th

Insulating housing

11

Carrier frame

12th

Sidewall of

11

13

Cross strut

14

Base plate

15

Recess of

14

16

bolt

17th

Lever system

18th

Swivel lever

19th

Coupling rod

20th

first end of

18th

21

second end of

18th

22

first end of

19th

23

second end of

19th

24th

Scenery tour

25th

Contact finger

26

Contact rail

27

Leaf spring

28

Metal ring

29

Contact section

30th

Middle section

31

Support section

32

Lever system

33

first lever

34

second lever

35

first end of

33

36

first end of

34

37

second end of

33

38

second end of

34

39

first end of

40

40

lever

41

second end of

40

42

lever

43

first end of

42

44

second end of

42

45

Control plug

46

Control socket

47

Transverse bulkhead
I direction of insertion
II swivel axis of

18th

III axis of rotation of

42

Claims (20)

1.Electrical switchgear, in particular for medium voltages, that is to say nominal voltages in the range from greater than 1 KV to less than 52 KV, with at least one insertable in a slot ( 2 ) of a frame ( 1 ), in particular switchgear-carrying device insert ( 3 ) connected with electrical Contacts ( 5 ) is provided which can be brought into engagement with electrical mating contacts ( 6 ) held in the frame ( 1 ), characterized in that the contacts ( 5 ) for engaging with the mating contacts ( 6 ) when in the insertion compartment ( 2 ) of the frame ( 1 ) inserted device insert ( 3 ) relative to the device insert ( 3 ) in the direction of the counter contacts ( 6 ) are displaceable. 2. Switchgear according to claim 1, characterized in that the plug-in unit ( 3 ) has contact rails ( 26 ), along which the contacts ( 5 ) between a retracted position in which the contacts ( 5 ) with the counter contacts ( 6 ) are disengaged, and a contacting position, in which they are in engagement with the counter contacts ( 6 ), can be pushed ver. 3. Switchgear according to claim 2, characterized in that the contact rails ( 26 ) are electrically conductive and serve for the electrical connection of the contacts ( 5 ) with the plug-in unit ( 3 ). 4. Switchgear according to claim 2 or 3, characterized in that the mating contacts ( 6 ) are designed as electrically conductive rails, which when the device is inserted ( 3 ), the contact rails ( 26 ) together with these lie opposite each other and on which the contacts ( 5 ) can be pushed on to establish the electrical connection with the slide-in frame ( 3 ). 5. Switchgear according to one of claims 2 to 4, characterized in that the contacts ( 5 ) are each formed by two contact fingers ( 25 ) which rest on two sides of the contact rail ( 26 ) which are abovecvand. 6. Switchgear according to claim 5, characterized in that pressing means ( 27 ) are provided, through which the contact fingers ( 25 ) at least in their contacting position against the contact rail ( 26 ) and, if appropriate, ge conditions of the mating contact rail ( 6 ) can be pressed. 7. Switchgear according to claim 6, characterized in that the contact fingers ( 25 ) are each loaded by egg ne on a housing ( 10 ) supporting leaf spring ( 27 ). 8. Switchgear according to claim 7, characterized in that the housing ( 10 ) is designed as an electrical insulating housing and in particular consists of plastic. 9. Switchgear according to claim 7 or 8, characterized in that at least the two leaf springs ( 27 ) of a pair of contact fingers ( 25 ) of a contact rail ( 26 ) are brought together with these in a common housing ( 10 ). 10. Switchgear according to one of claims 6 to 9, characterized in that the pressing means ( 27 ) are only effective in the contacting position of the contact fingers ( 25 ). 11. Switchgear according to claim 10, characterized in that means ( 32 ) are provided, by means of which the contact fingers ( 25 ) can be moved away from the contact rail ( 26 ) against the force of the pressing means ( 27 ). 12. Switchgear according to claim 11, characterized in that between the two contact fingers ( 25 ) of a pair of contact fingers ( 25 ) a lever system ( 32 ) is easily seen through which the two contact fingers ( 25 ) are spread apart. 13. Switchgear according to claim 12, characterized in that the lever system ( 32 ) has a dead center in the spread position. 14. Switchgear according to one of the preceding claims, characterized in that several, in particular all contacts ( 5 ) of a plug-in module ( 3 ) can be moved together. 15. Switchgear according to claim 14, characterized in that for moving the contacts ( 5 ), a frame ( 11 ), in particular made of plastic, is provided, which has a handle on struts ( 13 ) with all contacts to be moved ( 5 ) or can be brought into engagement. 16. Switchgear according to claim 15, characterized in that the frame ( 11 ) has side walls ( 12 ) and / or cross struts ( 13 ) for stiffening. 17. Switchgear according to claim 15 or 16, characterized in that the frame has an engagement plate ( 14 ), in particular a base plate, with a recess ( 15 ) into which an insertion linkage ( 17 ) can engage. 18. Switchgear according to claim 17, characterized in that (17) also activates the pressure means (27) and disabled by the push rod. 19. Switchgear according to one of the preceding claims, characterized in that the contacts ( 5 ) can be locked against displacement in the contacting direction (I) and / or in the decontacting direction. 20. Switchgear according to one of the preceding claims, characterized in that the device insert ( 3 ) has a control plug ( 45 ) which is in the inserted state of a control bushing se ( 46 ) in the plug-in frame ( 1 ) and for engagement with the control bushing ( 46 ) is movable.