DE3036670A1 - Medium voltage switch drive movement - has two co-located levers with springs at two sides and fixed travel tripped by latches - Google Patents

Abstract

The drive mechanism for a medium voltage switch features a reduction of moving parts. A two spring action moves the switch from off to on and vice versa. Two levers (2,3) are co-located on the same shaft (1), one lever (3) is fixed to the shaft (1), the other (2) turns freely on it. An operating lever (4) is attached to the first lever (2) and a spring (5) is attached to a similar point on the second lever (3) then fixed to an anchor point. A second spring (7) is attached between the two levers (2,3) using an arm tensioning arrangement opposing movement between the two levers. An arrangement of latches (8,9,10) and operating levers (11-13) release the levers for changeover movements, between fixed points.

Description

Drive for a medium voltage switch

The invention relates to a drive for a medium-voltage switch with two spring accumulators for switching the medium-voltage switch from the "0" position in at least one switching position and back to the "0" position.

For drives of medium-voltage switches with spring accumulators often the immediate readiness to switch off the medium-voltage switch after Switching on required, with no renewed tensioning between switching on and off of the spring accumulator should be required.

In this way it is achieved, for example, that in the event of a fault, the switch without the the delay caused by the renewed tensioning of the spring accumulator is switched off again can be.

In the case of commercially available drives, there is therefore a spring accumulator in each case provided for switching on and a spring accumulator for switching off, whereby the switch-off spring store is also tensioned when the switch-on spring store is tensioned will. However, these known drives have a complex construction and are for use in three-position switches, apart from the on and off switch for example, still have a grounding position, only suitable to a limited extent, since a Actuation of the switch only in the direction specified by the tension of the spring accumulator Direction is possible.

The object of the invention is therefore to provide a drive of the type mentioned at the beginning Kind to train in such a way that it is simple and reliable from a few components can be produced.

This object is achieved according to the invention by a) two on one Expansion shaft axially spaced levers, of which the first lever is free the expansion shaft rotatably and the second lever rotatably connected to the expansion shaft The first lever is connected to the medium-voltage switch via a drive rod is connected, b) a first spring accumulator between a fixed point and the second lever, cj a second spring accumulator between the first and second lever, the spring action being such that a torque is opposed to the first lever acts on the second lever for torque, d) a first pawl with which the second Lever can be locked in place in the tensioned state of the first spring accumulator, e) a second pawl with which the first lever is cocked with the second lever State of the second spring accumulator can be locked, f) a third pawl with which the first lever can be locked in place in the position, the pawls through a first to third actuating element can be triggered, g) one on the second lever arranged driving pin, which when the second spring accumulator is tensioned on a first Flank and, when the second spring accumulator is relaxed, on a second flank of the first Lever.

In the drive according to the invention, both can via the tensioning shaft Spring accumulator are tensioned at the same time.

At the same time, the first lever is fixed so that the Drive rod is not moved during the clamping process. The drive consists essentially only from the two levers, three pawls with actuating elements and two spring accumulators. All of these elements are easy to manufacture, making the entire drive special production-friendly and at the same time reliable in operation At a Drive for a medium voltage switch, which has a "0" position and two more, Has positions lying in opposite directions of rotation, is advantageous with the first actuating element of the medium-voltage switch from the "0" position into the first switch position or from the second switch position into the "0" position switched, with the second actuating element, the medium-voltage switch of the first switching position is switched to the "0" position and with the third actuating element the medium-voltage switch is switched to the second switch position, the first Actuating element in the first pawl, the second actuating element in the first Switching position of the medium-voltage switch, the second pawl and the third actuating element in the "0" position of the medium-voltage switch, the second and third pawls triggers. The drive according to the invention can also be used particularly advantageously for three-position switching it is used because the switching process from the "0" position when the spring accumulator is tensioned can be triggered in both directions, with a downshift in each case in the "O" position is possible. It should be emphasized that with the When tensioning the spring accumulator, the future switching direction cannot yet be preselected must, the switching direction only depends on which of the two spring accumulators is triggered first.

The first and the second pawl are expediently semi-cylindrical Bolts that engage at the edges in cams of the first and second lever and which are released by twisting around their longitudinal axis. This enables a simple Release of the pawls.

The first pawl can be rotatably mounted on a stationary bolt and connected to an actuating lug be that on a beveled The end of a plunger connected to the first actuating element runs.

This means that the first latch can be triggered by the first Actuator given. The second pawl can be rotatably mounted on the second lever, be provided with a return spring and connected to an actuating lug, which faces a plunger in the position of the medium-voltage switch, which is connected to the third actuating element and which is in the first switching position the medium-voltage switch faces a plunger which is connected to the second actuating element connected is. Depending on the position of the drive, the second pawl is either triggered via the second or via the third actuating element.

The third pawl can be at one edge of a substantially circular arc-shaped Attack part of the first lever and via a reversing lever with the third actuating element stay in contact. This enables the third pawl to be triggered by the third actuating element regardless of the position of the lever.

The second pawl expediently runs in the shape of a circular arc Recess of the first lever, which has a notch at one end into which the Latch engages.

With this arrangement, the second and third pawl can be in the same Area of the first lever can be arranged, so that there is one for the arrangement the actuating elements results in a particularly favorable arrangement.

If the drive is to be operated by hand, the actuators are advantageously designed as snap fasteners.

An embodiment of the invention is exemplified below explained in more detail with reference to FIGS.

Figure 1 shows the drive in the position of the medium-voltage switch, both spring accumulators 5 and 7 are tensioned. On the expansion shaft 1, with which the both spring accumulators 5 and 7 can be tensioned, a lever is freely rotatable 2 arranged, which consists essentially of two interconnected, sickle-shaped Sharing consists. Behind this lever 2 is a second, in Figure 1 only partially Visible lever 3 is arranged, which is non-rotatably connected to the tensioning shaft 1. On one arm of the second lever 3, a compression spring 5 acts against a fixed point 6 is supported. In the state shown, the compression spring 5 is tensioned, the lever 3 being held in place by the pawl 8, which will be described in more detail later. Another compression spring 7 is arranged between the lever 3 and an arm of the lever 2, which thus generates a torque between the two levers 2 and 3. Here is that Torque that is exerted by the compression spring 7 on the lever 2, opposite to the torque of the compression spring 5 on the lever 3. The spring 7 is also in tension State shown, the lever 2 being held in place relative to the lever 3 by the pawl 9 will. The lever 3 also has a driving pin 3a, which is between two flanks 2a and 2b of the lever 2 and, in the state shown, bears against the flank 2a.

The lever 2 is via an actuating rod 4 with a not shown Medium voltage switch connected.

This medium-voltage switch has three switch positions, namely a "0" position, an on position and a ground position. Here lies the On position to the left and the earth position to the right of the "0'2 position. An arrow 2c on lever 2 points to markings of the Drive housing that represent the respective switch position.

In Figures 2 to 5 is the corresponding switch position Position of the drive shown.

Figure 2 shows the on position that is reached when the pawl 8 triggers and thus releases lever 3.

This moves under the action of the spring 5 in a clockwise direction around the tensioning shaft 1. The lever 2 and thus the medium-voltage switch moves with it. The relative position between levers 2 and 3 remains unchanged and the compression spring 7 remains tensioned.

When the pawl 9 is then released, it rotates under the action of the compression spring 7 of the lever 2 counterclockwise, the medium-voltage switch via the drive rod 4 is brought back into the "0" position. So are now both compression springs 5 and 7 relaxed. This state is shown in FIG. This shows that it is possible to use the drive, the medium-voltage switch to the on and then back to the "0" position without in between renewed tensioning of the spring accumulator is necessary.

To tension the spring accumulators 5 and 7 again, must.

only the drive lever 3 rotated counterclockwise are, for example, via the expansion shaft 1 by a not shown, on this attached lever can be done. The compression springs 5 and 7 are tensioned at the same time, the lever 2 and thus the medium-voltage switch by the Pawl 10 is held in the "0" position.

To the medium voltage switch in the grounding position shown in Figure 4 to bring, the pawl 9 is triggered. The compression spring 7 relaxes and rotates the lever 2 counterclockwise, the medium voltage switch is switched to the grounding position via the drive rod 4. The lever 3 is held in place by the pawl 8 during this process.

The compression spring 5 thus also remains tensioned.

To get back to the "0" position shown in Figure 5, the latch 8 is triggered. The lever 3 is under the action of the compression spring 5 turned counterclockwise, whereby the lever 2 and thus the medium-voltage switch is moved along by the driving pin 3a resting against the flank 2b of the lever 2.

It was thus shown that the drive according to the invention from the "0" position can also be brought out into the grounding position and back again, whereby No tensioning of the spring accumulator 5 or 7 necessary between the two switching operations is. It is particularly advantageous that when tensioning the spring accumulators 5 and 7 the future switching direction has not yet been specified. Rather, from the in Figure 1 position shown with tensioned spring stores 5 and 7 in any Direction can be switched depending on which pawl is triggered first. That results in a considerable relief when using the drive It has been shown that to switch the switch from the "0" position to the on position the pawl 8, to switch from the on position to the "0" position, the pawl 9, to switch over from the position to the earthing position, the pawls 9 and 10 and to switch over from the earthing position in the "0" position, the pawl 8 must be triggered. Corresponding the actuating elements must be designed.

In Figure 1 push buttons 11 to 13 are provided for actuation, with which the drive can be operated by hand. The pushbuttons 11 to 13 are equipped with tappets 11a to 13a. The plunger 11a carries a plate at its end 11b, which is inclined to the direction of actuation of the push button 11. On this plate 11b is a flag 8a of the pawl 8. The pawl 8 is in the area in which it engages the lever 3, designed as a half cylinder, with one rotation about the cylinder axis of the lever 3 is released. This rotation is done by the Push button 11 over the plunger 11a, the plate 11b and the flag 8a. By actuation of the push button 11 can thus with the sequence already shown, the medium-voltage switch from the position to the on position or from the earthing position to the position to be brought.

The plunger 12a of the push button 12 is the actuating lug 9a of the The pawl 9 opposite when the lever 3 is pivoted clockwise. The handle 9 is rotatably mounted on the lever 3. She is in the area in which she is on the Lever 2 engages, also semi-cylindrical and is opposite when turned clockwise, release lever 2. The pawl 9 is locked by a spring 9b State held and can on the actuating lug 9a, for example by the Plunger 12a are triggered. With the actuation of the push button 12 so the Medium voltage switch can be switched from the on position to the position.

The push button 12 is connected to the pawl 10 via a reversing lever 10a coupled. The pawl 10 engages an edge of a substantially circular arc Part of lever 2. By pressing the push button 12, the pawl 10 is from Lever 2 pulled away and this released. To a return of the operating button 13 to enable the starting position even when the pawl is released, the plunger runs 13a of the push button 10 in a hole in the reversing lever 10a and the connection between the reversing lever 10a and the push button 13 takes place only in a non-positive manner the pin 13b.

In the basic position shown in Figure 1, when actuated of the push button 13 at the same time with the pawl 10 also triggered the pawl 9, since the Actuating lug 9a of the pawl 9 faces the plunger 13a. With the actuation button 13 the medium-voltage switch can move from the position to the earthing position to be brought.

In order to prevent the pawl 9 from turning even when the lever 3 is triggered by hitting the plunger 13a, the end 9c of the actuating flag 9a turned. The end 9c can therefore move freely when the lever 3 is rotated move past the plunger 13a.

By pressing the three push buttons 11 to 13, each of the switching positions shown can be achieved. Of course, next to one Manual operation, for example, electromagnetic operation is also possible.

5 Figures 8 claims

Claims (8)

Patent claims 1. Drive for a medium-voltage switch with two Spring accumulators for switching the medium-voltage switch from the "O" position to at least one switch position and back to the 0 11 position, g e k e n n -z e i c h n e t by a) two axially spaced apart on an expansion shaft (1) Lever (2, 3), of which the first lever (2) can be freely rotated on the tensioning shaft (1) and the second lever (3) is non-rotatably connected to the tensioning shaft (1), the first lever (2) connected to the medium-voltage switch via a drive rod (4) is, b) a first spring accumulator (5) between a fixed point (6) and the second lever (3), c) a second spring accumulator (7) between the first (2) and the second Lever (3), the spring action being such that a torque is applied to the first lever (2) opposite to the torque on the second lever (3) acts, d) a first pawl, with which the second lever (3) is stationary in the tensioned state of the first spring energy store can be locked, e) a second pawl (9), with which the first lever (2) with the second Lever (3) can be locked in the tensioned state of the second spring accumulator (7), f) a third pawl (10) with which the first lever (3) can be locked in place in the position is, wherein the pawls (8-10) by a first to third actuating element (11 - 13) can be triggered, g) one arranged on the second lever (3) Driving pin (3a) which, when the second spring accumulator (7) is tensioned, is attached to a first Flank and, with the second spring accumulator (7) relaxed, on a second flank of the first lever. 2. Drive according to claim 1 for a medium-voltage switch that a "0" -Siellung and two more, in opposite directions of rotation Has switching positions, d u r c h e k e n n -z e i c h n e t that with the first actuating element (11) of the medium-voltage switch from the "0" position into the first switch position or from the second switch position to the "0" position is switched that the medium voltage switch with the second retainer (12) is switched from the first switch position to the "0" position and that with the third actuating element (13) of the medium voltage switch in the second switch position is switched, wherein the first actuating element (11) the first pawl (8), the second actuating element (12) in the first switching position of the medium-voltage switch the second pawl (9) and the third actuating element (13) in the "0" position of the medium-voltage switch triggers the second and third pawls (9, 10). 3. Drive according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the first and the second pawl (8, 9) semi-cylindrical bolts are, the edges of which engage in cams of the first and second lever (2, 3) and which are released by twisting around their longitudinal axis. 4. Drive according to claim 3, d a d u r c h e g e -k e n n z e i c h n e t that the first pawl (8) is rotatably mounted on a stationary bolt and with a Actuating lug (8a) is connected, which is on a beveled End (11b) of a plunger (11a) connected to the first actuating element (11) runs. 5. Drive according to claim 3 or 4, d a d u r c h g e k e n n z e i c h n e t that the second pawl (9) rotatably mounted on the second lever (3), with a return spring (9b) and connected to an actuating lug (9a) which, in the "0" position of the medium-voltage switch, faces a plunger (13a), which is connected to the third actuating element (13) and which is in the first Switching position of the intermediate voltage switch is opposite a plunger (12a) which with your second actuating element (12) which is bound. 6. Drive according to one of claims 3 to 5, d a -d u r c h g e k It is noted that the third pawl (10) on one edge of a substantially engages circular arc-shaped part of the first lever and a reversing lever (1 Ca) is in communication with the third actuating element (2). 7. Drive according to one of claims 1 to 6, d a -d u r c h g e k e n n z e 1 c h ne t that the second pawl (9) is in a circular arc-shaped recess of the first lever (2) runs, which has a notch at one end into which the pawl (9) intervenes. 8. Drive according to one of claims 1 to 7, d 2 d u r c h g e k e n n z e i h n e t that the actuating elements (11 - 13) as push buttons - aus-geF forms are.