DE102020212116A1 - Coupling device and high-voltage circuit breaker with such a coupling device - Google Patents

Abstract

The invention relates to a coupling device (16) with a coupling mechanism (22) for coupling a movement of an actuating element (18) of a switch-on resistor arrangement (14) to a movement of an actuating element of a switching unit (12) of the switching unit (12) and the switch-on resistor arrangement (14) comprehensive high-voltage circuit breaker (10). It is provided that the coupling device (16) also has a resetting device (44) for automatically resetting the actuating element (18) after a defined movement position has been reached during a switch-on process. The invention also relates to a high-voltage circuit breaker (10) with such a coupling device (16) .

Description

The invention relates to a coupling device with a coupling mechanism for coupling a movement of an actuating element of a switch-on resistor arrangement to a movement of an actuating element of a switching unit of a high-voltage circuit breaker comprising the switching unit and the switch-on resistor arrangement.

The invention further relates to a corresponding high-voltage circuit breaker with a switching unit, which has an actuating element that can be moved axially with respect to a longitudinal axis of this switching unit, and an on-resistance arrangement that has an actuating element that can be moved axially with respect to a longitudinal axis of this on-resistance arrangement for actuating the on-resistance arrangement, the actuating element for moving the actuating element via a coupling device with a coupling gear is coupled to this actuating element.

In the case of high-voltage circuit breakers, turn-on resistances of a turn-on resistor arrangement are used to limit overvoltages when they are switched on. In this case, a switch-on resistor with an associated auxiliary contact gap is used in the switch-on resistor arrangement for each switching unit of the circuit breaker.

A mechanical coupling gear (intermediate gear) has the task of controlling the contact movement in the auxiliary contact gap depending on the movement of the contacts in the main contact gap of the switching unit. The contact movement in the main switching gap of the switching unit results from the movement of the actuating element, the contact movement in the auxiliary switching gap of the on-resistance arrangement results from the movement of the actuating element.

The previously available solutions for mechanical coupling gears are either not durable or they require breaking energy, which is then lacking in the main switching gap of 2-cycle circuit breakers in particular.

The pamphlet DE 10 2018 205 910 A1 shows a coupling device with a coupling mechanism for coupling a movement of an actuating element of a switch-on resistance arrangement to a movement of an actuating element of a switching unit of a high-voltage circuit breaker comprising the switching unit and the switch-on resistance arrangement. The linkage consists of a shaft and several levers. During the switch-on process, the auxiliary contact gap also closes first. After the subsequent closing of the main contact gap, the on-resistance remains ON. The auxiliary contact gap is only switched off when it is switched off and must move faster than the main contact gap. Furthermore, this publication also shows the complete high-voltage circuit breaker.

Such a coupling mechanism is mechanically extremely reliable, but since the auxiliary switching gap is switched off in parallel with the main switching gap being switched off, part of the breaking energy is required for this. In the case of fast circuit breakers (2-cycle circuit breakers) in particular, however, all available energy is required for the main switching gap. Furthermore, a rest phase must be observed for subsequent circuits in order to ensure contact coordination.

It is the object of the invention to specify measures by which the main switching path in the switching unit is given the full breaking energy.

The object is solved by the features of the independent claims. Advantageous configurations are specified in the dependent claims.

In the coupling device according to the invention with a coupling gear for coupling a movement of an actuating element of a switch-on resistor arrangement to a movement of an actuating element of a switching unit of a high-voltage circuit breaker comprising the switching unit and the switch-on resistor arrangement, it is provided that this coupling device also has a resetting device for automatically resetting the actuating element after a defined movement position has been reached has during a switch-on process. With a coupling device of this type, the resetting device thus ensures that the actuating element is automatically reset. This usually happens after closing the main contact gap of the switching unit, but still during the switch-on process. Thus, during a subsequent switch-off process, the main switching path in the switching unit receives the full switch-off energy and the rest phases required for a sequence of switching operations are automatically maintained.

In particular, it is provided that the restoring device for restoring has an energy store, in particular a compression spring, which is prestressed via the switch-on movement. This energy store provides the energy to reset the actuating element and is "charged" via the switch-on movement.

It is advantageously provided that the compression spring is arranged coaxially with respect to the actuating element. The compression spring preferably surrounds the actuating element at least partially circumferentially in the defined movement position.

According to a preferred embodiment of the invention, the coupling mechanism has a locking structure for the detachable connection of coupling elements that couple the movement of the adjusting element and the movement of the actuating element. In the locked state, the locking structure couples the coupling elements and their movement and releases this coupling in the released state.

Furthermore, the coupling device preferably has a triggering mechanism for triggering the reset device. The triggering mechanism therefore specifies when the actuating element is reset.

The triggering mechanism preferably has a triggering stop marking the defined movement position and a triggering lever and is set up to activate the resetting device when the triggering lever hits the triggering stop.

Furthermore, it is advantageously provided that the triggering mechanism, in particular its triggering lever, acts on the locking structure to trigger the resetting device. To put it more precisely, it releases the corresponding coupling elements, so that the movement or position of the actuating element is no longer coupled to the movement or position of the actuating element. Now, for example, the prestressed energy store can ensure that the actuating element is returned to an open position (OFF position).

According to a further preferred embodiment of the invention, the linkage has at least one shaft and/or at least one lever element. The use of linkages with shafts and lever elements has proven itself in high-voltage circuit breakers.

According to a further preferred embodiment of the invention, the coupling mechanism has a toggle lever arrangement on the actuating element side, which includes at least one of the lever elements. The use of toggle lever arrangements has also proven itself in high-voltage circuit breakers.

In the high-voltage circuit breaker according to the invention, with a switching unit that has an actuating element that can be moved axially with respect to a longitudinal axis of the switching unit and a switch-on resistor arrangement that has an actuating element that can be moved axially with respect to a longitudinal axis of this switch-on resistor arrangement for actuating the switch-on resistor arrangement, the actuating element for moving the actuating element having a coupling device with a linkage is coupled to this actuating element, it is provided that this coupling device is designed as the above-mentioned coupling device. With this high-voltage circuit breaker, the main switching gap in the switching unit receives the full breaking energy.

• 1 eine Teilansicht eines Hochspannungsleistungsschalters im Bereich seiner Koppeleinrichtung gemäß einer ersten bevorzugten Ausführungsform der Erfindung,
• 2 einen an einer Einschaltwiderstandsanordnung des Hochspannungsleistungsschalters angeordneten Teil der Koppeleinrichtung bei ausgeschalteter Schaltstrecke der Einschaltwiderstandsanordnung,
• 3 den in 2 gezeigten Teil der Koppeleinrichtung am Beginn des Einschaltvorgangs,
• 4 den in den 2 und 3 gezeigte Teil der Koppeleinrichtung beim Erreichen eines Auslösepunktes einer Rückstelleinrichtung der Koppeleinrichtung,
• 5 den in den 2 bis 4 gezeigte Teil der Koppeleinrichtung bei einem Schritt des Auslösens der Rückstelleinrichtung und
• 6 den in den 2 bis 5 gezeigte Teil der Koppeleinrichtung bei einem Rückstellschritt der Rückstelleinrichtung.

In the following, exemplary embodiments of the invention are shown schematically in drawings and described in more detail below. show:

• 1 a partial view of a high-voltage circuit breaker in the area of its coupling device according to a first preferred embodiment of the invention,
• 2 a part of the coupling device arranged on an on-resistance arrangement of the high-voltage circuit breaker when the contact gap of the on-resistance arrangement is switched off,
• 3 the in 2 shown part of the coupling device at the beginning of the switch-on process,
• 4 the in the 2 and 3 shown part of the coupling device when a triggering point of a reset device of the coupling device is reached,
• 5 the in the 2 until 4 shown part of the coupling device in a step of triggering the reset device and
• 6 the in the 2 until 5 part of the coupling device shown in a resetting step of the resetting device.

the 1 shows a partial view of a high-voltage circuit breaker 10 in dead-tank design with a switching unit 12 referred to as an interrupter unit and an on-resistance arrangement 14 in the area of a coupling device 16 for coupling a movement of a 2 until 6 Actuating element 18 of on-resistance arrangement 14 (EWID arrangement) shown to a movement of an actuating element (not shown) of switching unit 12. In this high-voltage circuit breaker 10 in dead-tank design, switching unit 12 is therefore designed as a dead-tank switch. The switching unit 12 and the on-resistance arrangement 14 are arranged side by side, with their longitudinal axes aligned in parallel. The switching unit 12 designed as a dead tank switch has a switch (not shown) in an encapsulating housing 20 .

The actuating element of the switching unit 12, which can be moved axially with respect to the longitudinal axis of the switching unit 12, actuates the actual switch (not shown) of this switching unit 12, the so-called main switching path. The pin-shaped actuating element 18 of the on-resistance arrangement 14, which can be moved axially with respect to the longitudinal axis of the on-resistance arrangement 14, actuates the on-resistances (EWIDs) of this on-resistance arrangement 14 via the so-called auxiliary contact gap.

The coupling device 20 has a in the 2 until 6 partially shown linkage 22 on. This comprises at least one lever element (not shown) on the side of switching unit 12, a shaft 24 on a first axis 26 running transversely to the longitudinal axes of switching unit 12 and on-resistance arrangement 14, and on the side of on-resistance arrangement 14 a first lever element 28 which is connected to the shaft 24 is non-rotatably connected and is thus mounted pivotably with respect to the first axis 26, and a second lever element 30 which is mounted pivotably with respect to a displaceable second axis 32 which runs parallel to the first axis 26. The two lever elements 28 , 30 shown are coupled to one another via a releasable locking structure 34 .

The coupling mechanism 22 has a toggle lever arrangement 36 on the actuating element side, which includes the second lever element 30 . Via this toggle lever arrangement 36 and a guide 38 (designed here in the example as a slide) the actuating element 18 is moved linearly, ie shifted.

A compression spring 40 is arranged coaxially with respect to the linear displacement path of the actuating element 18 or the longitudinal extent of the actuating element 18 . This is an energy store 42 of a restoring device 44 for restoring the actuating element 18 and is prestressed via the switch-on movement. The resetting device 44 ensures that the actuating element 18 is automatically reset after a defined movement position has been reached when the high-voltage switch 10 is switched on.

For this purpose, the coupling device 16 also has a triggering mechanism 46 for triggering the reset device 44 . The triggering mechanism 46 in turn has a triggering stop 48 defining a triggering position (corresponding to the defined movement position of the actuating element 18 ) and a triggering lever 50 . The triggering mechanism 46 is set up to activate the resetting device 44 when the triggering lever 50 hits the triggering stop 48 .

the 2 shows the part of the coupling device 16 arranged on the on-resistance arrangement 14 when the auxiliary switching path of the on-resistance arrangement 14 is switched off. This is the initial situation when the high-voltage circuit breaker 10 is switched on, in which the actuating element 18 is in a maximum extended position with respect to the on-resistance arrangement 14.

the 3 until 6 now show the timing of the switch-on process and the associated reset process in the area of the in 2 shown part of the coupling device 16.

The 3 said part of the coupling device 16 at the beginning of the switch-on process. In the linkage 22, a drive of the actuating element of the switching unit 12 ensures a rotary movement of the shaft 24 (arrow 52), which in turn, via the other components 28, 30, 34, 36 of the linkage 22 shown, causes a linear movement of the actuating element 18 (arrow 54) cares. The locking structure 34 is in the locked state and couples the movements of the two lever elements 28, 30. The release lever 50 arranged on the first lever element 28 is held in a basic position by a reset element 58 and is in a position spaced from the release stop 48. The compression spring 40 is pretensioned by the linear movement of the actuating element 18 (arrow 56).

the 4 shows the part of the coupling device 16 when a trigger point of the reset device 44 is reached. In this position, the first lever element 28 is pivoted so far that the free end of the trigger lever 50 has reached the trigger stop 48 . The compression spring 40 is further biased.

5 shows said part of the coupling device 16 in a step of triggering the reset device 44. A further rotation of the shaft 24 (arrow 54) now also pivots the trigger lever 50 against the restoring force of the reset element 58 and acts on the locking structure 34. The compression spring 40 is thereby further biased.

the 6 finally shows the part of the coupling device 16 during/after a resetting step of the resetting device 44. The triggering mechanism 46 has now acted on the locking structure 34 with its triggering lever 50, so that the locking between the two lever elements 28, 30 is released. The part of the linkage 22 connected to the actuating element 18 and the restoring device 44 (here in the example the toggle lever arrangement 36) can now continue to move independently of the move the remaining part of the linkage 22 coupled to the actuating element of the switching unit 12 (including the components shaft 24 and the first lever element 28). Driven by the restoring force of the energy store 42, embodied as a compression spring 40, of the restoring device 44, the actuating element 18 moves back into its in 2 shown starting positions. Although the main switching path of the switching unit 12 is still closed, the auxiliary switching path of the on-resistance arrangement 14 is already open again. This is also the main difference from the situation of the 2 , where the main contact gap and the auxiliary contact gap are open.

The switch-on process of the high-voltage circuit breaker 10 usually has the following course over time: if the switch-on process is started, the auxiliary contact gap of the on-resistance arrangement 14 closes first and only then does the main contact gap of the switching unit 12 (interrupter unit). Then, as the final step in the switch-on process, the auxiliary contact gap is opened again. When the high-voltage circuit breaker 10 is switched off, the main switching gap is opened and the locking structure 34 is brought into a locking state in which it couples the two lever elements 28, 30 again. During this switching-off process, the main switching path in the switching unit 12 receives the full switching energy used. The rest phases that are required for subsequent switching operations are also automatically maintained.

Reference List

10

high voltage circuit breaker

12

switching unit

14

on-resistance arrangement

16

coupling device

18

actuator

20

encapsulating housing (switching unit)

22

linkage

24

wave

26

axis, first

28

Lever element, first

30

lever element, second

32

axis, second

34

locking structure

36

toggle assembly

38

guide

40

compression spring

42

energy storage

44

reset device

46

trigger mechanism

48

trigger stop

50

release lever

52

axis

54

arrow

56

arrow

58

return element

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102018205910 A1 [0006]

Claims (10)

Coupling device (16) with a coupling mechanism (22) for coupling a movement of an actuating element (18) of a switch-on resistor arrangement (14) to a movement of an actuating element of a switching unit (12) of a high-voltage circuit breaker (10 ), characterized by a resetting device (44) for automatically resetting the actuating element (18) after a defined movement position has been reached during a switch-on process. coupling device claim 1 , characterized in that the restoring device (44) for restoring an energy store (42), in particular a compression spring (40), which is biased by the switch-on movement. coupling device claim 2 , characterized in that the compression spring (40) is arranged coaxially with respect to the actuating element (18). Coupling device according to one of Claims 1 until 3 , characterized in that the linkage has a locking structure (34) for the detachable connection of the movement of the adjusting element (18) and the movement of the actuating element coupling coupling elements (28, 30). Coupling device one of Claims 1 until 4 , characterized by a trigger mechanism (46) for triggering the resetting device (44). coupling device claim 5 , characterized in that the release mechanism (46) has a release stop (48) marking the defined movement position and a release lever (50) and is set up to activate the restoring device (44) when the release lever (50) hits the release stop (48). . coupling device claim 5 or 6 , characterized in that the triggering mechanism (46), in particular its triggering lever (50), acts on the locking structure (34) to trigger the restoring device (44). Coupling device according to one of Claims 1 until 7 , characterized in that the linkage (22) has at least one shaft (24) and/or at least one lever element (28, 30). coupling device claim 8 , characterized in that the linkage (22) has a toggle lever arrangement (36) on the actuating element side, which comprises at least one of the lever elements (30). High-voltage circuit breaker (10) with a switching unit (12), which has an actuating element that can be moved axially with respect to a longitudinal axis of this switching unit (12), and a switch-on resistor arrangement (14) that has an actuating element (18) that can be moved axially with respect to a longitudinal axis of this switch-on resistor arrangement (14). the switch-on resistance arrangement (14), the actuating element for moving the actuating element (18) being coupled to this actuating element (18) via a coupling device (16) with a coupling gear (22), characterized in that the coupling device (16) acts as a coupling device ( 16) after one of Claims 1 until 9 is trained.

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