Drive unit for driving switching contacts of a high-voltage circuit breaker

Abstract

The invention relates to a drive unit (10) for driving switching contacts of a high-voltage circuit breaker (50), having a handling element (12), a plurality of adjusting elements (16, 18, 20) for adjusting the switching contacts, wherein at least two adjusting elements (16, 18, 20) are arranged spaced apart from one another with respect to an axis (24), and a mechanism (22), in particular a lever mechanism, for transmitting a movement of the handling element (12) into a corresponding movement of the adjusting elements (16, 18, 20), wherein the mechanism (22) comprises at least one shaft (26) which is rotatably supported on the axis (24) and serves to transmit a movement of the handling element (12) into a corresponding movement of at least one adjusting element (18, 20) which is arranged spaced apart from the handling element (12) in the axis direction of the axis (24). It is provided that the drive unit (10) further has a compensation coupling (36) for compensating for a delay in the transmission of movement between at least two adjusting elements (16, 18, 20) of the adjusting elements (16, 18, 20) which are arranged spaced apart from one another with respect to the axis (24).

Description

Technical Field

[0001] The present invention relates to a drive unit for driving the switch contacts of a high-voltage circuit breaker, comprising (i) an actuating element; (ii) a plurality of adjusting elements for adjusting the switch contacts, wherein at least two adjusting elements are arranged spaced apart from each other about an axis; and (iii) a mechanism, particularly a lever mechanism, for transmitting the movement of the actuating element to the corresponding movement of the adjusting elements, wherein the mechanism has at least one shaft rotatably supported on the axis for transmitting the movement of the actuating element to the corresponding movement of at least one adjusting element, the at least one adjusting element being arranged spaced apart from the actuating element in the axial direction of the axis. Background Technology

[0002] DE 10 2018 205 910 A1 discloses a single-pole high-voltage circuit breaker in the form of a housing-grounded structure, having a switching unit, a closing resistor unit, and a drive unit for driving the switching contacts of the switching unit and the closing resistor unit. The longitudinal axes of the switching unit and the closing resistor unit extend spaced apart from each other, and the corresponding switching contacts also move along these longitudinal axes. The drive unit has: (i) an actuating element capable of axial movement about the longitudinal axis of the switching unit; (ii) adjusting elements arranged spaced apart from each other about the transverse axis for adjusting the switching contacts; and a mechanism for transmitting the movement of the actuating element to the corresponding movement of the adjusting elements. This mechanism includes at least one shaft rotatably supported on the axis for transmitting the movement of the actuating element to the corresponding movement of the adjusting elements for the closing resistor unit's switching contacts, the adjusting elements being arranged offset from the actuating element axis. The movement of the switching contacts of the switching unit, not directly shown in this document, is generated, for example, directly by the movement of the actuating element through a rigid intermediate element. However, this is not so critical in this type of application if the switching of the switching elements is not performed precisely simultaneously or does not have a well-defined delay.

[0003] The switching movement of the switching contacts in a high-voltage circuit breaker is extremely rapid. Therefore, the initial switching movement results in a sudden force and consequently, very high acceleration. When motion is transmitted via the rotation of a shaft or similar component, inertia-induced shaft torsion occurs, causing a delay in motion transmission depending on the length of the section crossing the shaft. This is particularly critical in multi-pole high-voltage circuit breakers, where, for example, the switching contacts of the interrupter units for each pole are switched by such a drive unit.

[0004] Document DE 199 13 059 A1 discloses a high-voltage circuit breaker with three switching poles, wherein each switching pole has at least one interruptor unit whose drivable switching contacts can be manipulated by a switching lever via a common switching driver such that a delayed connection occurs between the interruptor units of at least two switching poles during closing, wherein the switching lever of at least the first switching pole is connected to the switching driver via a lever. To achieve delayed connection of the interruptor units of a switching pole or from one switching pole to another during closing, only the switching levers of the second and / or third switching poles are connected to the switching driver via a spring element that can be compressed during closing and expands after contact connection. Summary of the Invention

[0005] Starting from the aforementioned inertia problem related to the axis, the technical problem to be solved by the present invention is to provide a drive unit having an axis for motion transmission, in which the drive of adjustment elements arranged spaced apart from each other about the axis can be precisely synchronized.

[0006] According to the present invention, this technical problem is solved by the features of independent claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

[0007] In a drive unit for driving the switching contacts of a high-voltage circuit breaker according to the invention, the drive unit includes (i) an actuating element, (ii) a plurality of adjusting elements for adjusting the switching contacts, wherein at least two adjusting elements are arranged spaced apart from each other about an axis, and (iii) a mechanism, particularly a lever mechanism, for transmitting the movement of the actuating element to the corresponding movement of the adjusting elements, wherein the mechanism includes at least one shaft rotatably supported on the axis for transmitting the movement of the actuating element to the corresponding movement of at least one adjusting element, which is arranged spaced apart from the actuating element in the axial direction of the axis. Specifically, the drive unit also has a compensating coupling device for compensating for delays in the transmission of movement between at least two adjusting elements arranged spaced apart from each other about the axis. Here, the mechanism particularly includes a compensating coupling element.

[0008] Compensating coupling devices are used particularly as push rods and / or pull rods. This compensating coupling device "replaces" other rigid coupling rods (push rods and / or pull rods) used in practice.

[0009] According to a preferred embodiment of the invention, the compensating coupling device has a spring device having at least one spring element, particularly a disc spring. This spring element serves as a temporary energy storage device and is responsible for delaying energy or force transmission. Alternatively, the compensating coupling device has an additional energy storage device having at least one energy storage element.

[0010] Specifically, the compensating coupling device further includes a component for pre-tensioning at least one spring element. This component is specifically configured to pre-tension at least one spring element in an adjustable manner.

[0011] Furthermore, it is advantageously specified that different delays can be achieved through a pre-selected number and / or shape of spring elements or energy storage elements. Therefore, the motion process can be variably adjusted. Among other things, the on and off movements can be designed to be variably adjusted separately from each other. For this purpose, for example, spring elements with different spring constants are used and / or the spring travel of each spring element is specifically specified.

[0012] According to another preferred embodiment of the invention, the axial orientation of one of the adjusting elements about the axis is not far from the actuating element. There are also no axis-related torsional or inertial problems in the motion transmission to this adjusting element.

[0013] In this design, it is specifically specified that the compensation coupling device is arranged in the transmission path between the actuating element and the adjusting element, which has no distance relative to the actuating element about its axis. Therefore, compensation / equalization is performed in this transmission path.

[0014] According to another preferred embodiment of the invention, the mechanism designed as a lever mechanism has a main lever arranged on a shaft and coupled to an actuating element, and at least one additional lever spaced axially from the main lever. These levers are typically used as return levers.

[0015] Advantageously, it is stipulated here that the operating element, the main lever, the compensating coupling device, and the adjusting element, which are axially incompatible with the operating element, are arranged in a plane. The transmission path in this plane does not extend axially through a shaft and can be achieved by only one linkage.

[0016] According to the design scheme of the lever mechanism, the compensation coupling device is directly coupled to the main lever.

[0017] Furthermore, it is advantageously specified that the main lever is designed as a double-sided lever. Preferably, the actuating element is coupled to one side, and the compensating coupling device and the adjusting element, which have no axial distance relative to the actuating element, are coupled to the other side.

[0018] Another embodiment of the invention specifies that a lever, preferably used as a return lever, is also arranged in the transmission path between the actuating element and the adjusting element which is axially incompatible with the actuating element.

[0019] The present invention also relates to a high-voltage circuit breaker having at least two switching poles, particularly a three-pole design, and the high-voltage circuit breaker also having the aforementioned drive unit for driving the switching contacts of the high-voltage circuit breaker. Attached Figure Description

[0020] The features, characteristics, advantages, and implementations of the invention described above will become clearer and more apparent in conjunction with the following description of embodiments, which are illustrated in more detail with reference to the accompanying drawings. In the drawings:

[0021] Figure 1 A preferred design of a drive unit for driving the switching contacts of a high-voltage circuit breaker according to the present invention is shown.

[0022] Figure 2 The drive unit is shown in cross-section, with the cross-section passing through the compensation coupling device of the drive unit.

[0023] Figure 3 Details of the compensation coupling device are shown.

[0024] Figure 4 The drive unit and drive actuator are shown, as well as

[0025] Figure 5 A portion of a high-voltage circuit breaker with a drive unit and a drive actuator is shown. Detailed Implementation

[0026] Figure 1 A drive unit 10 is shown for driving the switching contacts of a high-voltage circuit breaker 50 designed in a multi-stage configuration. Figure 5 It is shown in at least part of the text.

[0027] The drive unit 10 includes an actuating element 12, a drive actuator 14 for driving the actuating element 12, multiple (three in this example) adjusting elements 16, 18, and 20 for adjusting switch contacts, and a mechanism 22 designed as a lever mechanism for transmitting the motion of the actuating element 12 to the corresponding motion of the adjusting elements 16, 18, and 20. The central element of the mechanism 22 is a shaft 26 rotatably supported on an axis 24 and a main lever 28 fixedly or at least torsionally connected to the shaft 26. The main lever 28 is designed as a double-sided lever about the axis 24. The mechanism 22 also includes three levers 30, 32, and 34 and a compensating coupling device 26, which is associated with one of the adjusting elements 16, 18, and 20 respectively, and functions as a coupling rod, i.e., as a pull rod and / or push rod. The actuating element 12 acts directly on the main lever 28, more precisely, on one side of the main lever 28. The three levers 30, 32, and 34 function as return levers in the drive unit 10.

[0028] One of the adjusting elements, adjusting element 16, is axially aligned with the main lever 28 about axis 24. The actuating element 12, main lever 28, compensating coupling device 36, and adjusting element 16 are arranged in a plane perpendicular to axis 24, with the adjusting element having no axial distance relative to the actuating element 12 and the main lever. Here, the motion transmission between the actuating element 12 and the adjusting element 16 is achieved via a pure linkage arrangement rather than through axis 26. The corresponding linkage arrangement is formed by the main lever 28, compensating coupling device 26, and one of the three levers, lever 30.

[0029] Two of the three levers, 32 and 34, are axially spaced on the shaft 26 relative to the main lever 28 and are fixedly or at least torsionally connected to the shaft. The adjusting elements 18 and 20 (hereinafter referred to as "other adjusting elements") associated with the levers 32 and 34 are also axially spaced relative to the main lever 28.

[0030] Therefore, all three adjusting elements 16, 18, and 20 used to adjust the switch contacts are arranged spaced apart from each other about axis 24, wherein one of the adjusting elements 16 has no distance relative to the actuating element 12 about axis 24, and the other adjusting elements 18, 20 and their associated levers 32, 34 are arranged axially about axis 24 on the right and left sides of the plane having the main lever 28. In this example, the distances (in magnitude) between the other adjusting elements 18, 20 and their associated levers 32, 34 are equal.

[0031] The compensating coupling device 36 compensates for the delay in motion transmission between the adjusting element 16 and other adjusting elements 18, 20, which are controlled more directly via a linkage arrangement, while the other adjusting elements are controlled slightly delayed via shaft 26 due to inertia-related torsion. The compensating coupling device 36 has a spring device 38 with at least one spring element (two disc springs in this example). This spring device acts as a temporary energy storage device and is responsible for the delay in energy or force transmission to the adjusting element 16. The compensating coupling device 36 here acts as a coupling rod (push rod and / or pull rod) and thus "replaces" other rigid coupling rods used.

[0032] The compensating coupling device 36 consists of two rod components arranged sequentially on a common axis and coupled by a spring device 38. Two spring elements 42, designed as disc springs, are threaded onto a pin-shaped shaft element 40 of one rod component, wherein a portion of a housing 44 of the other rod component, spanning one spring element 42, is arranged between the two spring elements 42. Furthermore, the compensating coupling device 36 has a component for pre-tensioning at least one spring element 42. This component is specifically configured to pre-tension the spring element 42 in an adjustable manner. In the present case, this component is designed with particular simplicity. The pin-shaped shaft element 40 has external threads that form a threaded connection 46 with at least one nut or other mating element, through which the spring element 42 can be pre-tensioned in an adjustable manner.

[0033] Figure 2 The drive unit 10 is shown in cross-section, where the cross-section is the plane mentioned, in which the actuating element 12, the main lever 28, the compensating coupling device 36 and the adjusting element 16 are arranged, the adjusting element having no axial distance relative to the actuating element 12 and the main lever.

[0034] Figure 3 Details of the compensating coupling device 36 are shown. This diagram further clarifies that the compensating coupling device 36 functions as a coupling rod in the linkage arrangement. Two rod components arranged sequentially on a common axis, coupled by a spring device 38, are also clearly visible. Two spring elements 42 are arranged on the pin-shaped shaft element 40 of one rod component, with an element of the other rod component arranged between the two spring elements 42. Furthermore, the threaded connection 46 formed by the pin-shaped shaft element 40 with its external thread and nut is clearly visible.

[0035] Figure 4 The drive unit 10 and most of the drive actuator 14, which is designed as a spring energy storage drive, are shown in a side view.

[0036] Figure 5Finally, the drive unit 10 and drive actuator 14 at the end of the switching unit 48 of the corresponding high-voltage circuit breaker 50 are shown. This high-voltage circuit breaker currently has a casing-grounded structure.

[0037] The key features of the invention will now be discussed again in another expression based on the embodiments shown.

[0038] The shaft 26 is brought into rotational motion by the force exerted by the actuator 14 at the main lever 28. The high force and speed cause a torsional angle at the levers 32 and 34 at the ends of the shaft 26 through the moment of inertia of the shaft 26.

[0039] If lever 30 is directly coupled to main lever 28, for example, via a rigid coupling device, direct force transmission is achieved. In the other levers 32 and 34, the force action of the spring-loaded actuator is delayed due to the torsional angle of shaft 26. Therefore, levers 30, 32, and 34 move with different starting points or speeds, resulting in different current contact times at different poles.

[0040] To address this issue, instead of a rigid coupler, a coupler that responds with a delayed response to the force applied to the spring accumulator is used. This coupler is formed by a compensating coupling device 36.

[0041] Based on the torsion angle of shaft 26, coupler 36 is decoupled via spring element 42 (here, a disc spring). Therefore, any delay, particularly within the millisecond range (ms range), can be generated by the spring travel of spring element 42 and subsequent locking. This is possible in both the disconnecting and connecting directions, or only in either the disconnecting or connecting direction. Thus, the delayed response behavior of levers 32 and 34 can be synchronized with the response behavior of lever 30.

Claims

1. A drive unit (10) for driving the switch contacts of a high-voltage circuit breaker (50), comprising: - Control element (12). - A plurality of adjusting elements (16, 18, 20) for adjusting the switch contacts, wherein at least two adjusting elements (16, 18, 20) are arranged spaced apart from each other about axis (24), and - Mechanism (22) for transmitting the motion of the actuating element (12) to the corresponding motion of the adjusting elements (16, 18, 20), wherein, The mechanism (22) includes at least one shaft (26) rotatably supported on the axis (24), the shaft for transmitting the movement of the actuating element (12) to corresponding movements of at least one adjusting element (18, 20), the at least one adjusting element being spaced apart from the actuating element (12) in the axial direction of the axis (24). The feature is a compensating coupling device (36) for compensating for delays in motion transmission between at least two adjusting elements (16, 18, 20), namely adjusting elements arranged spaced apart from each other about the axis (24) and adjusting elements that have no distance relative to the actuating element (12) about the axis (24), so that there are no torsional or inertial problems associated with the axis (26) in the motion transmission to the adjusting elements.

2. The driving unit according to claim 1, Its features are, The compensation coupling device (36) has a spring device (38) having at least one spring element (42).

3. The driving unit according to claim 2, Its features are, The compensation coupling device (36) has a component (46) for pre-tensioning the at least one spring element (42).

4. The drive unit according to any one of claims 1 to 3, Its features are, One of the adjustment elements (16) has no distance relative to the control element (12) about the axis (24).

5. The driving unit according to claim 4, Its features are, The compensation coupling device (36) is arranged in the transmission path between the actuating element (12) and the adjusting element (16), the adjusting element having no distance relative to the actuating element (12) about the axis (24).

6. The drive unit according to any one of claims 1 to 3, Its features are, The mechanism (22) designed as a lever mechanism has - Main lever (28), which is arranged on the shaft (26) and coupled to the actuating element (12), and - At least one additional lever (32, 34) spaced axially apart from the main lever (28).

7. The driving unit according to claim 6, Its features are, The actuating element (12), the main lever (28), the compensating coupling device (36), and the adjusting element (16) which has no axial distance relative to the actuating element (12) are arranged in a plane.

8. The driving unit according to claim 6, Its features are, The compensation coupling device (36) is directly coupled to the main lever (28).

9. The driving unit according to claim 6, Its features are, The main lever (28) is designed as a double-sided lever.

10. The driving unit according to claim 5, Its features are, A lever (30) is also arranged in the transmission path between the actuating element (12) and the adjusting element (16) which has no axial distance relative to the actuating element (12).

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