Switch board with a chassis

p0001The invention relates to a panel according to the preamble of the first claim.

p0002A well-known panel of this kind (DE 3812853 C1) has a skeleton in the housing depth on parallel rails on which a chassis with wheels seated moved. The chassis supports three horizontally arranged side by side switch poles, each of which two perpendicular protrude freely in the enclosure depth over-stacked contact arms. The like chassis, Schalterpolen and fed-arranged Betätigungseinrichtungen formed Schaltwagen is a horizontal verlaufenden Traverse provided that at Frontseite the chassis rests and after the manual insertion of Schaltwagens in the framework with the latter locked is. The arrangement is made such that the contact arms are still far from disposed in the rear portion of the scaffold mating contacts. To the cross arm, a threaded spindle is rotatably but axially fixed, on the one connected to the switching truck threaded nut piece is turned up. The threaded spindle is accessible through the traverse therethrough and coupled with a hand crank, by means of which the threaded spindle can be turned. This allows the switching cars are moved while being supported on the cross member in the depth of the panel stand until the contact arms with the associated scaffolding fixed mating contacts come into electrical contact system. The upper contact arms reach through this breakthroughs in a vertical partition wall, behind which the associated busbars associated mating contacts are arranged. This Durchbrüchen is a common Shutterblende associated with the parallel to the partition slidably mounted, and a Hebelgestänge with one of the Gewindespindel controlled Betätigungshebel so in Wirkverbindung is that in the ausgefahrenen Trennstellung of Schaltwagens the Shutterblende the breakthroughs closing and at the beginning of the retraction movement in the first actuation of Gewindespindel the breakthroughs for the retraction of the upper Kontaktarme freigibt. During the return movement of the switching truck in the initial extended position of the Shutterblende is with the last rotation of the threaded spindle moves back into a closed position. A disadvantage of this construction that when retracting the Schaltwagens at Gewindespindel aufzu-bringende torque then increases significantly when the Kontaktarme in Steckverbindung with Gegenkontakten occur, since in this case a very high Kontaktdruckkraft overcome is.

p0003The invention has for its object to meet with a panel according to the preamble of the first claim measures, by which a reduction of the moving together and separating the contact arms and is accomplished counter-contacts required torque on the lead screw.

p0004This object is carried out according to the invention by gekennzeichnende features of the first claim.

p0005In one embodiment of a switching field of the invention is the use of a toggle mechanism which is adjusted from a bent position in axis-same extended position of its toggle lever pair during the retraction of the chassis, the high feed force required for the moving together of the contacts then applied when the chassis largely is moved into its working position, the contacts are therefore bringing in mating engagement. In addition, is still achieved that the occurring during operation, no longer act on the switching truck acting reaction forces, especially at short circuit on the threaded spindle, but rather directly by the chassis on the crosshead and associated components and of the crossmember on the on the respective elongated toggle lever pair mating contacts supporting structure are transmitted. Preferably, in a parallel to the plane of Laufschienen plane lying two symmetrically constructed and angeordnete Kniehebelpaare provided. For the coupling of or the toggle lever pairs with the threaded nut piece each have a steering lever, on the one hand pivotally mounted on nut piece and on the other hand articulated to the common toggle joint connecting the two toggle a toggle lever pair is used. Anyway, in a symmetrical arrangement of two toggle lever pairs the threaded spindle runs parallel to and centrally between the provisions for the chassis rails to ensure an exact parallel displacement on the infrastructure and to absorb even occur in operating surge forces tilt-free can. This may combine the Laufschienen particular rigidly to the Traverse be connected, said traverse together with the Laufschienen and a dieselben carrying Grundplatte as Einschubkassette be formed can, together with the mounted thereon Schaltwagen in the skeleton and insert it to lock is. The chassis can be configured with a low height and the unit used in cassette and switching cars above a cable space in the skeleton. The pivot point of each toggle lever pair on switchgear truck is especially further away from the cross bar as the fixed pivot point in the direction of the housing depth. Here, the point of articulation ortsfeste also in the central region between the end positions of the threaded mutterstücks be arranged. In addition, the fixed pivot point in greater radial distance sit from the threaded spindle than the linkage point of the respective toggle lever pair on the chassis. Also, the toggle joint point may lie in the retraction of the chassis respectively before the threaded nut piece. The result is thus a compact, the forces occurring matched structure of the toggle mechanism. Contributing in particular the inclination of the toggle lever pairs in its extended position at. It is expedient, the remote lever each approximately L-shaped form and with its short leg on the threaded nut piece and with its long leg at the knee joint to hinge so that the long leg in the final position of the threaded nut piece in the extended switching truck parallel to the longitudinal axis of the threaded spindle and with retracted switching truck is approximately perpendicular to the stretching axis of the respective toggle lever pair. In order to achieve a mechanically stable support of the respective toggle lever pair, sitting in their fixed articulation point, in particular to the associated running track, which is formed in cross-section U-shaped and can therefore withstand high mechanical loads. The stationary pivot point is preferably placed so that it sits between two running wheels of the chassis which are assigned to the relevant rail. The distance between the wheels is greater than the producible using the threaded spindle length of Entry or Ausfahrweges the switching carriage. The Laufräder can therefore in normal break-in and Ausfahrbetrieb not against ortsfesten actuation points or associated Kniehebel encounter, especially since these Kniehebel during the extending, so when adjusting the Schaltwagens, in the electrical Trennstellung from their inclined to a nearly vertical position gegenüber the tracks are adjusted. The drive of the threaded spindle can be effected by an attachable to the traverse side end winch or via a gear by an electric motor.

p0006The invention is described in detail with reference to schematic diagrams of an exemplary embodiment. Show it:<dl id="dl0001"><dt>Figure 1:</dt><dd>a cross-sectional view through a control panel with a located in retraction switching cars, </dd><dt>Figure 2:</dt><dd>a partial representation of the stored in a cassette shifting carriage in a side view and</dd><dt>Figure 3:</dt><dd>a plan view of the arrangement of Figure 2 with only partially Pictured shifting carriage which is located in the position shown in solid lines in extended position and in the position shown in dashed lines in the retracted position.</dd></dl>

p0007A switching field, which is particularly suitable for use in medium voltage systems, comprises a rectangular frame (1) comprising the front in the lower region and in the central region of a respective door (2,3) and in the upper region a control box (4). Through the lower door (2) a cable compartment (5) with imported down cables (6) is provided which is arranged above bus bars per phase with one at the rear (8) of the framework (1) the current transformer (9) and, arranged thereunder voltage converter (10) are electrically connected. Of the Stromwandlern lead Stromleiter to about angeordneten Gegenkontakten (10) overlying insulating sleeves (11) on one of the frame (1) connected Zwischenwand (13) firmly connected are. In is located in a corresponding arrangement, a further insulating sleeve (12) having therein determinate counter contact (12) which is connected via further current conductor (7) to a busbar of a three-phase busbar system (14). For three-phase design are three Gegenkontakte in waagerechter direction nebeneinander in the partition (13). Above the cable space (5) and between the middle door (3) and the partition (13) is a switch chamber (15) in which each phase of a power switch (16) is arranged in the form of a vacuum switch with a vertical axis. With the terminals of the circuit breaker (16) (17) are connected in height spaced contact arms, which protrude into the frame depth and in the illustrated retracted position of the circuit breaker (16) are provided with plug connection to the framework-fixed mating contacts (11). The circuit breaker (16) sit at a drive box (18) from which an actuating rod (19) to the movable contact pin (20) of the power switch leads and via which the switching on or off of the power switch (16). The drive unit (18) is mounted on a chassis (21) which is movably guided on wheels in rails (23) extending from the area of ​​the door (3) in the frame depth to the partition (13) out in parallel. The running rails (23) sitting on a bottom plate (24.1) of a stability reasons trough-shaped plug-in unit (24) which after insertion of the out of the cassette (24), the chassis (21), the drive box (18) and the power switch (16 ) formed by switching car unit is locked by means of a horizontally extending cross member (25) detachably on the stand (1). However, when inserting the unit into the switch chamber (15) is the chassis (21) to the drive unit (18) and the power switches (16) in an extended position in which the door (3) facing the drive box next to the door (3 ) stands and the connectors (11,17) by the corresponding distance to the door (3) toward feigned contact arms (17) are separated.

p0008To be able to process the chassis (21) in the cassette (24), a drive device is provided which comprises a threaded spindle (26) which is in the crossmember (25) mounted secured against axial displacement rotatable and to the door (3) towards oriented coupling piece (27) for attaching a winch having. The at least at its inner end (26.1) in addition to the bottom plate (24.1) of the cassette (24) in a supporting lug (28) mounted threaded spindle (26) carries on its threaded portion a threaded piece (29) which by turning the threaded spindle (26) from the in figure 3 in solid lines shown, the cross-member (25) adjacent Ausgangsstellung after snapping of the crossbar (25) zugeordneten Verriegelungszapfen (30) in the frame (1) so far as to adjust is, until the in figure 3 by dashed lines reaches the end position shown in which the threaded nut piece (29) adjacent the support tab (28). In the illustrated in Figure 3 left starting position of the threaded nut piece (29), the chassis is connected to the power switch (16) in the extended position with separate contacts (11,17), while the Chassis in the dashed illustrated right end position of the threaded nut piece (29) the position shown in figure 1 with zusammengesteckten contacts (11,17) is located.

p0009In order to allow a comfortable adjustment of the base (21) in and out of the retracted position (Figure 1) and to relieve of forces via the power switch (16) to the chassis (21) in the retracted position, the threaded nut piece (29) in particular where there effect of short-circuit currents, acting in the direction of travel of the chassis 21 toggle mechanism is provided. This toggle mechanism here has a mirror image to the longitudinal axis of the threaded spindle (26) in a direction parallel to the rails level plane lying on two toggle lever pairs (31), wherein the toggle lever (31) of each pair at the common toggle joint point (32) with a link (33) pivotally connected are, the other end is mounted pivotably about a pivot point (34) on the threaded nut piece (29). A knee lever (31) of each toggle lever pair is pivotably mounted on the cassette (24) about a pivot point (24), while the second toggle lever (31) of each toggle lever pair about a pivot point (36) on the chassis (21) is pivotally mounted. The pivot point (36) of the device the switching truck toggle lever (31) of each toggle lever pair is further from the crossbar (25) is removed as the fixed, on the cassette (24) fixed pivot point (35) of the second toggle lever (31) each toggle lever pair. In this case, the fixed coupling point (35) sits in the central area between the axial end positions of the threaded nut piece (29) and at a greater radial distance from the threaded spindle (26) than the articulation point (36) of the respective toggle lever (31) of a toggle lever pair on the chassis (21) , The toggle lever pairs (31) are therefore available in extended position of the switching carriage (16,21) in a V-shaped allocation according to the top, as shown in Figure 3 in solid lines display, while in the retracted position (as shown in FIG 1) toggle (31) of the two toggle lever pairs in axially through the pivot points (36,32,35) extended position are (Figure 3, lower dashed representation). The toggle joint point (32) is in this case in the retracting direction of the chassis (21) in each case before the threaded nut piece (29) with a varying, radial distance from the threaded spindle (26). The steering lever (33) is formed in the rest of the roughly L-shaped and with its shorter leg on the threaded nut piece (29) and articulated by its longer leg on the toggle joint (32). In this case, the shorter leg is on the end position of the threaded nut piece (29) in the extended switching truck (Figure 3, solid lines) at least approximately perpendicular and the long leg approximately parallel to the longitudinal axis of the threaded spindle (26).

p0010If, starting from this initial position, in which the chassis (21) is in extended position, the threaded spindle (26) are added manually or by means of an electric motor (39) in rotation, the threaded nut piece (29) travels towards the supporting tab (28). In this case, the chassis (21) is achieved by facing in the adjustment position of the pivot lever (33) and only slightly, however, inclined, with the chassis (21) coupled to said toggle levers (31), a feed that corresponds to the beginning of the pitch of the threaded spindle in approximately. With increasing axial displacement of the threaded nut piece (29) for supporting tab (28) back after a displacement path, after the fixedly hinged arm (31) of the toggle lever pairs, for example exceeded a perpendicular to the threaded spindle (26) directed pivot position, the respective toggle lever pair under pivoting of the toggle joint point (32) progressively the extended position respectively. The feed motion of the chassis (21) thus decreases per revolution of the threaded spindle (26), but acting in the feed direction force component increases due to the toggle action of the toggle lever pairs (31) with an unchanged driving torque to the threaded spindle (26). Thus, when relatively shortly before reaching the in Figure 3 in strichpunktierten layers illustrated end position that the retraction of the chassis (21), with Federkontaktstücken tipped Kontaktarme (17) of Leistungsschalters (16) in contact with feststehenden counter-contacts (11) occur and under considerable Kraftaufwand it aufgeschoben will have, then it needs to Kniehebel-gelenkpunkten (32) at approximately stretched Kniehebeln (31) only a relatively small force to the mechanical friction generated Kontaktgleitwiderstand overcome. In an analogous manner is then to overcome the high frictional forces between the contacts (11,17) upon movement of the chassis (21) from the retracted position out only a correspondingly small torque on the threaded spindle (26) is required, because the return forces on the toggle link (32 ) are very small, if the toggle lever pairs (31) are returned from the extended position.

p0011The mirror-image arrangement of the toggle lever pairs (31) effected by the cooperation with the control arms (33) and the common threaded nut piece (29) an exact parallel guidance of the chassis (21) and in the extended position of the toggle lever pairs (31) which occur during operation, the current flow dependent impact forces of the straightened knee lever pairs (31) directly into the cartridge (24) eingeleitetund so kept away from the threaded nut piece. Furthermore, the threaded spindle (26) is acted upon in each case from opposite sides with identical forces, so that practically cause no stress on bending. The ortsfeste pivot point (35) of Kniehebelpaare (31) sits in particular on the associated Laufschiene (23), due to their U-shaped Querschnittsgestaltung high Eigensteifigkeit having and friction and Stromstoßkräfte with retracted landing gear (21) from drive-in pivot point (36 ' below) at least until close to the crossmember (25) zoom forwarded according Fig.3. The ortsfeste articulation point (35) of the Kniehebelpaare (31) is between two of these Laufschiene (23) zugeordneten Laufrädern (22) of the chassis (21) is provided. The distance between the stationary pivot point (35) and the in each case thereon zurollenden impeller (22) is greater than the respective still zurückzulegende travel path of the chassis (21).