Locking device for a switch cabinet and switch cabinet with such a locking device

Abstract

Locking device (100) for a switchgear compartment (599) with a circuit breaker (999), wherein the locking device (100) comprises a main locking lever (200) which can be in at least one locking position and in a trip prevention position, characterized in that the main locking lever (200) comprises at least two legs (210; 220), wherein the first leg (210) in the locking position blocks the transition of the locking device (100) to the trip prevention position if the circuit breaker (999) is in the OFF position, and wherein the second leg (220) in the switch-off prevention position blocks the transition of the circuit breaker (999) to the OFF position.

Description

[0001] The invention relates to a locking device for a switch room with a circuit breaker and a switch room with such a locking device.

[0002] There are electrical switchgear assemblies with circuit breakers that do not have explicit grounding. In such switchgear assemblies, grounding can be achieved via the circuit breaker. To ground the relevant switchgear bay or section of the switchgear, a three-position switch (with the three positions ON - OFF - GROUND) of the switchgear is moved to the grounding position, and then the circuit breaker is moved to the ON position.

[0003] For maintenance work on such switchgear with the described grounding concept, it must be ensured that, for safety reasons, this work is only permitted when the system is grounded. To ensure that the grounding is and remains active, certain safety mechanisms must be implemented.

[0004] Firstly, a cover or door of the switchgear compartment of the relevant switchgear panel may only be removed or opened when the circuit breaker is in the ON position. If the circuit breaker is in the OFF position, it must be ensured that the cover or door cannot be removed or opened. Furthermore, an interlock must prevent the circuit breaker from being switched off when the relevant switchgear panel of the switchgear is grounded and open.

[0005] DE 198 58 688 C1 discloses an electrical switchgear assembly with at least one device insert, in particular carrying switching devices, which can be inserted into a slot of a frame and is equipped with electrical contacts that can be engaged with mating electrical contacts held in the frame, with a mechanical insertion aid supported in the frame, by which the device insert can be moved from a disconnected position, in which the electrical contacts are separated from the mating contacts, to an operating position in which the electrical contacts are engaged with the mating contacts, wherein, in order to reduce the space requirement of the switchgear assembly, the insertion aid is fixedly installed in the frame and can be coupled to the device insert after it has been inserted into the frame for the purpose of advancing it.

[0006] The safety switch with misclosing protection disclosed in DE 40 29 344 A1 comprises a switch housing and a control element for actuating the switch, which can be rotated by an actuating element that can be inserted into a cutout in the switch housing. To prevent unintentional insertion of the actuating element into the cutout, a detent element and an activation lock with a locking bar and a release slide are provided, arranged in the cutout. The locking bar can be engaged in the detent element, and the detent element with the engaged locking bar can be actuated by inserting the release slide into the cutout to release the locking bar.

[0007] In DE 43 13 659 A1, a control panel features a door assembly with a door lock, which includes a locking element with a locking shaft. A first driver and a second driver, axially displaceable on the locking shaft, are mounted on the locking shaft. The first driver actuates a door bolt, while the second driver, depending on its axial position, interacts with a control slide that is dependent on a closing flap for an access opening of a drive mechanism. A sensing element, depending on the presence of a switching device in the switch compartment, actuates a control fork for the second driver.

[0008] DE 196 17 575 A1 relates to a door lock for a switchgear panel of a low-voltage or medium-voltage switchgear assembly, with a disconnecting and / or earthing switch, each of which can be manually or motor-driven by a drive shaft. In the switchgear panel, the door is first lowered or raised to open. A cam disc is attached to the earthing switch drive shaft, which interacts with a slide that is vertically slidable on the front wall of the switchgear panel. The slide has a recess that interacts with a bolt attached to the door, such that when the earthing switch is deactivated, the cam disc holds the slide in the "door closed" position by means of the bolt, thus preventing the door from being lowered or raised to open.

[0009] The invention is based on the objective of providing a locking device that meets the aforementioned safety mechanisms.

[0010] This problem is solved according to the invention by a locking device for a switch compartment with a circuit breaker having the features of claim 1. Advantageous embodiments of the locking device according to the invention are specified in the dependent claims. Likewise, the problem is solved according to the invention by a switch compartment having the features of claim 5. Advantageous embodiments of the switch compartment according to the invention are specified in the dependent claims.

[0011] The locking device for a switchgear compartment with a circuit breaker according to claim 1 comprises a main locking lever, which can be in at least one locking position and one trip prevention position, and at least two legs, wherein the first leg, in the locking position, blocks the transition of the locking device to the trip prevention position if the circuit breaker is in the OFF position, and wherein the second leg, in the trip prevention position, blocks the transition of the circuit breaker to the OFF position. An advantage of this is that the locking device according to the invention can circumvent space restrictions within a switchgear compartment, and the installation of the locking device does not require any intervention in the circuit breaker drive but can be carried out with the drive housing completely closed.Nevertheless, a simple and cost-effective solution exists with only a few components. The locking device according to the invention also offers the advantage of being very compact and only minimally increasing the overall size of the switch drive despite external mounting.

[0012] In one embodiment, the first leg is designed as a support leg, which blocks the transition of the locking device into the trip prevention position by being hindered in its movement by an assembly of the circuit breaker when the circuit breaker is in the OFF position.

[0013] In a further embodiment of the locking device, the second leg includes a lug that blocks an actuating element of the circuit breaker in the trip-prevention position, thus preventing the circuit breaker from moving to the OFF position. The actuating element can be actuated either manually or by an electrical trip release. The advantage is that both types of tripping (manual and electrical) are prevented simultaneously.

[0014] In one embodiment of the locking device according to the invention, it additionally includes a push button which is only actuated by the main locking lever in the locking position.

[0015] The object of the invention is also solved by a switch room comprising a circuit breaker, a housing, a housing door and a locking device according to the invention which locks or releases the housing door.

[0016] In one embodiment, the switch compartment includes a lock receptacle with a first bore, and the locking lever has a second bore, so that in the switch-off prevention position, the first bore is positioned next to the second bore, allowing a lock to be pulled through both bores. An advantage of this design is that, after removing the housing door, the locking device can be fixed in the switch-off prevention position, i.e., in the grounding position, by means of the lock.

[0017] In a further embodiment, the circuit breaker comprises a switching shaft and a trip spring assembly with a spring plate, wherein the first leg in the locking position blocks the transition of the locking device to the trip prevention position by supporting the first leg on the spring plate in such a way that actuation of the main locking lever is blocked.

[0018] The properties, features, and advantages of this invention described above, as well as the manner in which they are achieved, will become clearer and more readily understandable in connection with the following description of the exemplary embodiments, which are explained in more detail in conjunction with the figures. These figures show: Fig. 1 switch room with circuit breaker and locking device; Fig. 2 Locking device in locked position with housing door; Fig. 3 Locking device in locked position and circuit breaker in OFF position; Fig. 4. Locking device in the locked position and circuit breaker in the ON position; and Fig. 5. Interlocking device in the switch-off prevention position and circuit breaker in the ON position; and Fig. 6. Assembly of the locking device with push button.

[0019] Fig. Figure 1 shows a switchgear compartment 599 with a housing 500 and a housing door 600. A circuit breaker 999 is located in the switchgear compartment 599. A locking device 100 with a locking main lever 200 can lock or unlock the housing door 600.

[0020] In Fig. Figure 2 explains the locking device 100 in more detail. The main locking lever 200 is shown, along with how it locks the housing door 600 in the housing 500 when it cannot be actuated, i.e., when the circuit breaker 999 is switched off. Fig. 2. The main locking lever 200 is in the locked position. In this position, it is not possible to open or remove the housing door 600. The housing door 600 may, for example, have hooks 610; 620 that engage in openings 510; 520 of the housing 500. According to the Fig. 2. The housing door 600 is locked. To open and remove the housing door 600, it would have to be moved according to the instructions. Fig. 2 upwards in the direction of the arrow. The locking main lever 200 prevents movement of the housing door 600 in the direction of the arrow, because the first leg 210 of the locking main lever 200 is supported against an element of the deactivated circuit breaker 999 and therefore cannot be moved.

[0021] The main locking lever 200 is rotatably mounted about the axis 250. According to the Fig. 2. The main locking lever 200 can therefore be rotated counterclockwise around the axis 250 if it is released for rotation.

[0022] In Fig. Figure 3 shows the locking device 100 with the main locking lever 200 in the locked position. The main locking lever 200 comprises at least two legs 210; 220.

[0023] The first leg 210, in the locking position, blocks the movement of the locking device 100 into the trip prevention position if the circuit breaker 999 is in the OFF position. The locking device 100 or the main locking lever 200 is located in the Fig. 3 in the locked position.

[0024] In Fig. Figure 3 shows the switching shaft 990 and a trip spring assembly 900 with a spring plate 910 of the circuit breaker 999. The first leg 210 blocks the transfer of the locking device 100 from the locking position to the trip prevention position by bearing on the spring plate 910. According to the Fig. 3. Therefore, the locking device 100 cannot be moved from the locking position to the switching-off prevention position because the circuit breaker 999 is in the OFF position.

[0025] In Fig. 4. The circuit breaker 999 was moved to the ON position. By rotating the switching shaft 990, the switch, and thus also the trip spring assembly 900, was moved to the ON position. The spring plate 910 moved away from the second leg 210. This now allows the locking main lever 200 to be moved from the locking position to a trip prevention position.

[0026] This is accordingly in the Fig. Figure 5 shows the main locking lever 200 in the switch-off prevention position. According to the Fig. 2. The main locking lever 200 is located in the recess 530 in the upper position, and the housing door 600 can now be opened in the direction of the arrow according to the Fig. 2. They can be moved upwards and removed.

[0027] The second leg 220 of the locking main lever 200 includes a lug which blocks an actuating element 980 of the circuit breaker 999 in this trip prevention position, thus preventing the circuit breaker 999 from moving from the ON position to the OFF position. The actuating element 980 is used by the circuit breaker 999 to move it from the ON position to the OFF position. To move the circuit breaker 999 to the OFF position, the actuating element 980 would have to move in the direction of the arrow accordingly. Fig. Move 5 to the left, as shown in the illustration. This tab on the second leg 220 prevents such movement. Therefore, the circuit breaker 999 cannot be moved into the OFF position.

[0028] The switch compartment 599 can further include a lock receptacle 800, which contains a first bore 870. In the trip prevention position, this bore 870 can be positioned next to a second bore 270 of the locking main lever 200 such that a lock can be pulled through both bores 870 and 270. This prevents, for example, the locking main lever 200 from being moved into the locked position when the housing door 600 is removed, which would allow the actuating element 980 to be operated and the circuit breaker 999 to be moved into the OFF position.

[0029] The locking device 100 according to the invention can include a push button 700. In the switch-off prevention position according to Fig. 5. If the button is not pressed, it remains in the locked position according to the Fig. 3 and Fig. 4. The push button is actuated by the main locking lever 200. The push button 700 is designed as a normally open contact and ensures that the electrical trip release (not shown) is de-energized when the push button 700 is not actuated. When energized, the electrical trip release acts on the actuating element 980, which, however, is blocked when the circuit breaker 999 is switched on and the locking mechanism is actuated. An additional de-energization via the push button 700 prevents burnout in the event of continuous energization.

[0030] In Fig. Figure 6 shows the assembly of the locking device 100 with locking main lever 200 and first leg 210 and second leg 220. The push button 700 is also shown. Likewise, the lock receptacle 800 with the bore 870 is shown. This assembly offers the advantage of being very compact and only minimally increasing the overall volume of the switch drive despite its external mounting. The assembly according to Fig.6 can be retrofitted to the circuit breaker 999.

Claims

[1] Locking device (100) for a switchgear compartment (599) with a circuit breaker (999), wherein the locking device (100) comprises a main locking lever (200) which can be in at least one locking position and in a trip prevention position, characterized by , that the main locking lever (200) comprises at least two legs (210; 220), wherein the first leg (210) in the locking position blocks the transition of the locking device (100) to the trip prevention position if the circuit breaker (999) is in the OFF position, and wherein the second leg (220) in the switch-off prevention position blocks the transition of the circuit breaker (999) to the OFF position. [2] Locking device (100) according to claim 1, wherein the first leg (210) is designed as a support leg which blocks the transfer of the locking device (100) into the switch-off prevention position by being hindered in its movement by an assembly of the circuit breaker (999) when the circuit breaker (999) is in the OFF position. [3] Locking device (100) according to claim 1 or 2, wherein the second leg (220) comprises a lug which can block an actuating element (980) of the circuit breaker (999) in the off-prevention position in such a way as to prevent the circuit breaker (999) from being moved into the OFF position. [4] Locking device (100) according to one of the preceding claims, which additionally comprises a push button (700) which can only be actuated by the main locking lever (200) in the locking position. [5] Switch room (599) comprising a circuit breaker (999), a housing (500), a housing door (600) and a locking device (100) according to any of the preceding claims, which locks or releases the housing door (600). [6] Switch compartment (599) according to claim 5, wherein the switch compartment (599) comprises a lock receptacle (800) with a first bore (870) and the locking main lever (200) a second bore (270), such that in the switch-off prevention position the first bore (870) is located next to the second bore (270) in such a way that a lock can be pulled through the two bores (870; 270). [7] Switch chamber (599) according to claim 5 or 6, wherein the circuit breaker (999) comprises a switching shaft (990) and a trip spring assembly (900) with a spring plate (910), wherein the first leg (210) in the locking position blocks the transition of the locking device (100) to the trip prevention position by supporting the first leg (210) on the spring plate (910) in such a way as to block actuation of the main locking lever (200).

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