WO2010118843A1

WO2010118843A1 - Coupling of a tripping unit to a circuit breaker

Info

Publication number: WO2010118843A1
Application number: PCT/EP2010/002229
Authority: WO
Inventors: Ralf Wieland; Klaus-Peter Eppe
Original assignee: Abb Ag
Priority date: 2009-04-16
Filing date: 2010-04-09
Publication date: 2010-10-21
Also published as: DE102009017682A1; CN102396042A; EP2419914A1

Abstract

The invention relates to a system for coupling a tripping unit (1) to at least one circuit breaker, wherein the circuit breaker comprises a tripping lever (2, 2', 2", 2'", 2"") which is rotatably mounted between a latching and unlatching position and comprises a hollow shaft in the rotational axis thereof, wherein the tripping unit (1) comprises a coupling lever (3) rotatably mounted between an idle and a tripping position, wherein a tripping finger (4) that is coupled to the coupling lever (3) is inserted into the hollow shaft. The tripping finger (4) is a shaft (4), the rotational axis (5) of which is congruent with the rotational axis of the tripping lever (2), and the outside diameter of which is adapted to the inside diameter of the hollow shaft such that the shaft (4) is held rotatably in the hollow shaft. The tripping lever (2) comprises a guide pin (7) that extends into the free inner space (6) of the hollow shaft and has a first and a second guide edge (8, 9) extending in the radial direction. The shaft (4) comprises a segment-like recess (10) which extends in the axial direction and is delimited by first and second shaft contact edges (11, 12) extending in the radial direction. The opening angle α of the recess (10) formed between the projection lines of the shaft contact edges (11, 12) on the axis (5) is greater than the angle ß that is formed in the region of the guide pin (7) between the projection lines of the guide edges (8, 9) on the axis (5). The invention further relates to a tripping pin, to a tripping lever, and to the combination of a tripping unit and a circuit breaker.

Description

Coupling of a trip unit to a circuit breaker

description

The invention relates to a system for coupling a trip unit to at least one circuit breaker, wherein the circuit breaker comprises a rotatably mounted between a Verklinkungs- and a Entklinkungsstellung trigger lever having a hollow shaft in its axis of rotation, wherein the trip unit one between a resting and a Triggering position rotatably mounted coupling lever comprises, wherein a coupled to the coupling lever trigger finger is inserted into the hollow shaft, according to the preamble of claim 1.

The invention further relates to a trigger finger for coupling a trip unit to at least one circuit breaker, wherein the circuit breaker comprises a rotatably mounted between a Verklinkungs- and a Entklinkungsstellung trigger lever having a hollow shaft in its axis of rotation, wherein the trip unit one between a rest and a release position rotatably mounted coupling lever, wherein the trigger finger is insertable into the hollow shaft, according to the preamble of claim 4.

In addition, the invention relates to a tripping lever for a circuit breaker ter, which is rotatably storable between a Verklinkungs- and a Entklinkungsstellung in the circuit breaker and having a hollow shaft in its axis of rotation, according to the preamble of claim 6, and a composite between a trip unit and at least a circuit breaker according to claim 8.

A trip unit is known for example under the term shunt release. A shunt release is an electrical service switching device that can be plugged as an additional module to a circuit breaker and with the help of the circuit breaker can be switched. The coupling between see the shunt release and the circuit breaker is designed so that when triggering the shunt trip this brings the trip lever of the circuit breaker in its Entklinkungsstellung, and releases the release lever of the circuit breaker otherwise. DE 10 2006 055 322 A1 describes an electricity meter system which comprises a selective main circuit breaker to which a shunt release is coupled. The shunt release and the circuit breaker are coupled by means of a bar-shaped release finger. When the shunt trip releases, its trip is transmitted via the beam shaped trigger finger to the trip lever of the selective main circuit breaker switch, causing it to unlatch the main line circuit breaker switchgear. However, the beam-shaped release finger can not be positioned unambiguously so that misalignment may occur during the coupling in which the forced release no longer functions.

It is therefore the object of the present invention to develop a generic coupling system so that the trigger finger is clearly positioned. It is a further object of the present invention to provide a suitable trigger finger and an improved release lever.

With regard to the system for coupling a trip unit to a circuit breaker, the object is achieved by a generic system with the characterizing features of claim 1. With respect to the release finger, the object is achieved by claim 4, and with respect to the release lever, the object is achieved by claim 6.

According to the invention, the release finger is a shaft whose axis of rotation coincides with the axis of rotation of the release lever, and whose outer diameter is adapted to the inner diameter of the hollow shaft, so that the shaft is rotatably supported in the hollow shaft, the release lever has a in the free interior the hollow shaft projecting guide pin having a first and a second, extending in the radial direction leading edge, the shaft has an axially extending, segment-like recess, which is bounded by extending in the radial direction of the first and second second wave application edges, which between the projection lines Shaft contact edges formed on the axis opening angle α of the recess is greater than the angle ß, which is formed in the region of the guide pin between the projection lines of the leading edge on the axis.

An advantage of the invention is that in the assembly of the coupling device against rotation and a clear mounting position is given, because the only guide pin can be in exactly one position in the segment-like recess in the shaft, which serves as a trigger finger insert. Due to the design of the release finger as a round shaft whose outer diameter is adapted to the inner diameter of the hollow shaft of the release lever, also a very good guidance of the release finger is given in the release lever. The trigger finger can not tilt.

Due to the fact that the segment-like recess in the shaft extends axially, a long shaft can also be inserted through a plurality of circuit breakers arranged side by side, wherein each guide pin engages each of the release levers of each circuit breaker in the recess.

When the release finger is rotated by the coupling lever from the rest to the release position, such as in a clockwise direction, its Wellenanle- edge comes into engagement with a leading edge on each of the guide pins of all the release lever, through which the shaft has been inserted, and moves Thus, all trip lever simultaneously from their Verklinkungs- in their Entklinkungsstellung. Thus, if, for example, a triple block of three side-by-line line circuit breakers, which have no common release, are coupled via a coupling device according to the invention with a shunt release, all three circuit breakers are triggered simultaneously by the shunt release. If the shunt release is designed so that its coupling lever is held in the tripping position after triggering, until a restart is allowed, then the trigger levers of all three connected circuit breakers are held in their respective Entklinkungsstellung over the coupling device according to the invention.

If the coupling lever of the shunt release is in its rest position, then a clearance is formed because of the larger opening angle α of the recess between the lying in the direction of rotation leading edge of the guide pin and the Wellenanle- edge of the shaft. To this clearance or angle range, a single trip lever of a circuit breaker can rotate freely when a single circuit breaker of the network triggers, for example due to a short-circuit current in the monitored by him circuit. It is thus ensured by the inventive design of the coupling device that each pole of a composite can trigger on their own without affecting the adjacent poles or the trip unit.

Further advantageous embodiments and improvements of the invention and further advantages can be taken from the subclaims. According to an advantageous embodiment of the invention, an axis-side boundary surface of the recess is formed by a segment of a cylinder jacket surface.

According to an advantageous embodiment of the invention, the guide pin has a trapezoidal cross-sectional contour.

An inventive trigger finger for coupling a trip unit to at least one circuit breaker is a shaft having an axially extending, segment-like recess which is bounded by extending in the radial direction first and second shaft contact edges.

According to an advantageous embodiment of the invention with respect to the release finger, an axle-side boundary surface of the recess is formed by a segment of a cylinder jacket surface.

An inventive release lever for a circuit breaker, which is rotatably storable between a Verklinkungs- and a Entklinkungsstellung in the circuit breaker and having a hollow shaft in its axis of rotation, has a projecting into the free interior of the hollow shaft guide pin having a first and a second, in the radial direction extending leading edge.

According to an advantageous embodiment of the invention with respect to the release lever, the guide pin has a trapezoidal cross-sectional contour.

Reference to the drawings, in which an embodiment of the invention is shown, the invention and further advantageous embodiments and improvements of the invention will be explained and described in detail.

It shows

FIG. 1 shows the insight into a triggering unit with a coupling device according to the invention,

FIG. 2 shows an enlarged view of the release finger according to the invention, connected to the coupling lever of the release unit and coupled to the release levers of three circuit breakers,

3 is a view of the position of the release finger on the release lever in the resting would be as well

Figure 4 is a view of the position of the trigger finger on the trigger when triggered circuit breaker.

First, FIG. 1 will be considered. The trip unit 1 has an insulating housing 14, which is composed as a shell housing of two half-shells and corresponds in its peripheral contour and its dimensions to the insulating housing of a selective main line circuit breaker, as described for example in DE 10 2008 117 472 A1. In Fig. 1, the upper half-shell is removed, so that the interior of the trip unit 1 is visible.

The trip unit 1 is attachable to a selective main circuit breaker either right or left, preferably it is attached to the right.

The insulating housing 14 has a front side, narrow sides, broad sides and a fastening side. With regard to the design of the attachment side and provided there assemblies for mounting the trip unit 1 on busbars in a meter box installation distribution, it also corresponds to the housing of a selective main line circuit breaker.

Between an input terminal 15 on a narrow side and an output terminal, of which only the terminal operating lever 16 can be seen in Fig. 1, runs a the main current path of a selective main line circuit breaker modeled signal current path in which a magnetic system, also impact armature system 17 is located. This comprises a magnetic circuit with a coil, a core, a movable armature and a plunger, the latter components are not shown in Figure 1.

Instead of the contact lever of a selective main circuit breaker is in the housing, mounted longitudinally displaceable about a housing fixed axis, a transmission assembly 18. Coupled to the transmission assembly 18, located near the front side a rotatably mounted coupling lever 3. This is arranged so that it Broad side of the housing penetrates approximately vertically.

In the case of a current pulse in the signal current path, the plunger of the impact armature system 17 strikes the transmission subassembly 18 from below. The mechanical coupling of the transmission subassembly with the coupling lever (not described here in detail) causes the dome lever 3 is rotated clockwise and can trigger one or more attached circuit breaker by the coupling lever 3 is coupled through the housing broad sides through a trigger finger 4 with the or the release levers of the circuit breaker or.

The coupling lever 3 is configured as a release lever of a couplable circuit breaker. In the illustration of Figure 1, the trigger finger 4 is inserted in the form of a wave in the direction of the housing broadside opening of the coupling lever 3. On the release finger, three release levers 2, 2 ', 2 "are pushed, representing a triple block of three circuit breakers, which is coupled to the trip unit 1. Fig. 2 shows an enlarged view of the release finger, which is in the coupling lever 3, with the deferred release levers 2, 2 ', 2 ".

Fig. 3 shows in cross-section an enlarged view of a release lever 2 with inserted in its hollow shaft trigger finger 4. The release lever 2 is a double arm, which is in its installed position in the circuit breaker with a first arm with a trigger member in conjunction, and with his second arm with a switch lock to its unlatching cooperates. Both arms are integrally formed on a central part, which has the shape of a hollow cylinder. The interior 6 of the hollow cylinder is also referred to here as a hollow shaft. On the inside of the interior 6 an inwardly facing guide pin 7 is formed. This has a cross-sectional contour approximately in the form of a trapezoid having a height which is smaller than half of the inner radius of the cavity 6. It is bounded by two radially oriented guide edges 8 and 9. If you think the leading edges 8 and 9 extended to the center 5 of the hollow cylinder, then these two projections thus obtained the leading edges together form a squirting angle ß, here about 30 °. Of course, other angular ranges are equally possible and encompassed by the invention.

The trigger finger 4 has the shape of a shaft. Its axis of rotation 5 is congruent with the central axis of the inner space 6 of the hollow shaft. The outer diameter is only slightly smaller than the inner diameter of the inner space 6 of the release lever 2. The shaft 4 carries a segment-like recess 10 which extends in the example of Figure 2 over an angular range α of about 90 °. Of course, other angular ranges are equally possible and encompassed by the invention. The segment-like recess 10 is bounded radially by a first and second wave guide edge 11, 12, and downward, to the axis of rotation 5 of the shaft, by a curved surface which corresponds to a cylinder jacket section. A total velvet, the cross-sectional contour of the recess 10 thus has the appearance of the letter W.

In the position shown in Figure 3, the leading edge 8 of the guide pin 7 is located on the shaft attachment edge 11 in the recess 10 of the shaft 4 at. Since the angle ß is smaller than the angle α, arises between the other, in the clockwise opposite, leading edge 9 and the other shaft contact edge 12, a free space whose angle corresponds to the difference of the angle α and ß.

The position, as shown in Figure 3, corresponds to the rest position of the release lever 2. When the shaft 4 is rotated clockwise, such as by the coupling lever of the trip unit 1, then it takes on the mating surface of the shaft guide edge 11 with the leading edge 8th Release lever also clockwise with. The release lever 2 is thus forcibly rotated in its release position in a clockwise direction. The movement of the release lever stops at the other shaft contact edge 12. The angle range α - ß must be sufficient for the release lever in the circuit breaker, in which it is installed, to release the latch mechanism. By selecting the appropriate angular ratios and thus distances, the coupling device according to the invention can be easily adapted to different triggering mechanisms.

All coupled to the shaft 4 release lever, so all trip lever, through the interior of the shaft 4 is pushed through, are triggered together.

When inserting the shaft 4 by the release lever, it can not lead to a rotation or incorrect assembly, because the one guide pin 7 can be in only one position on the only one recess 10 push.

Nevertheless, when the shaft 4 is fixed, the release lever 2 can rotate about the shaft 4, because of the clearance between the leading edge 9 and the wave leading edge 12. This is important because the triggering of a single circuit breaker must also be possible when the shaft 4 is in its rest position. Fig. 4 shows this state. The shaft 4 still has the same position as that in Fig. 3, but the release lever 2 has been pivoted clockwise. This happened, for example, in that in the circuit breaker in which the trigger lever 2 is installed, a short-circuit current has been detected and then the trigger mechanism of the circuit breaker the release lever 2 is pivoted to its release position. Fig. 2 shows the state in which the release lever 2 'and 2 "are in their rest position, and only the trigger lever 2 in its release position was pivoted.

For coupling the shaft 4 with the coupling element 3, the shaft 4 is simply inserted into the interior of the coupling element 3. The coupling element 3 is otherwise designed exactly like a release lever. However, the guide pin of the coupling element 3 is dimensioned such that there is no free space between it and the shaft contact edges of the shaft 4, so that the shaft 4 is to a certain extent firmly seated in the coupling element 3. It is a further advantage of the invention that for the coupling of the shaft 4 to the coupling element 3 no further precautions on the shaft 4 itself must be made, this can be prepared as a simple molded part with a uniform axially oriented recess 10 on its peripheral side.

LIST OF REFERENCE NUMERALS

1 trip unit

2 release levers

2 'release lever

2 "release lever

3 coupling levers

4 trigger fingers

5 axis of rotation

6 interior

7 guide pins

8 leading edge

9 leading edge

10 recess

11 shaft contact edge

12 shaft contact edge

13 segment

14 housing

15 input terminal

16 Terminal operating lever

17 impact anchor system

18 transmission module

Claims

claims

1. A system for coupling a trip unit (1) to at least one circuit breaker, wherein the circuit breaker a kink between a Verklin- and a Entklinkungsstellung rotatably mounted release lever (2, 2 ',

2 "), which has a hollow shaft in its axis of rotation, wherein the tripping unit (1) comprises a coupling lever (3) rotatably mounted between a rest position and a tripping position, wherein a tripping finger (4) coupled to the coupling lever (3) engages in the Hollow shaft is introduced, characterized

- That the trigger finger (4) is a shaft (4) whose axis of rotation (5) coincides with the axis of rotation of the release lever (2), and whose outer diameter is adapted to the inner diameter of the hollow shaft, so that the shaft (4) in the Hollow shaft is rotatably supported, - that the release lever (2) has a projecting into the free inner space (6) of the hollow shaft guide pin (7) having a first and a second, extending in the radial direction leading edge (8, 9),

- that the shaft (4) has an axially extending, segment-like recess (10) which is bounded by extending in the radial direction of the first and second shaft attachment edges (11, 12),

in that the opening angle α of the recess (10) formed between the projection lines of the shaft attachment edges (11, 12) on the axle (5) is greater than the angle β which exists in the region of the guide pin (7) between the projection lines of the guide edges (8, 9) is formed on the axle (5).

2. System according to claim 1, characterized in that an axis-side boundary surface of the recess (10) by a segment (13) of a cylinder jacket surface is formed.

3. System according to claim 1, characterized in that the guide pin (7) has a trapezoidal cross-sectional contour.

4. trigger finger (4) for coupling a trip unit (1) to at least one

Circuit breaker, wherein the circuit breaker a rotatably mounted between a Verklinkungs- and a Entklinkungsstellung trigger

(2, 2 ', 2 "), which has a hollow shaft in its axis of rotation, wherein the trip unit (1) comprises a rotatably mounted between a rest and a release position coupling lever (3), wherein the trigger finger (4) in the hollow shaft is insertable, characterized in that the trigger finger (4) is a shaft (4) having an axially extending segmental recess (10) bounded by radially extending first and second shaft abutment edges (11, 12).

5. trigger finger (4) according to claim 4, characterized in that an axis-side boundary surface of the recess (10) by a segment (13) of a cylinder jacket surface is formed.

6. release lever (2, 2 ', 2 ") for a circuit breaker which is rotatably storable between a Verklinkungs- and a Entklinkungsstellung in the circuit breaker and having in its axis of rotation a hollow shaft, characterized in that the release lever (2) has a in the guide rail (7) projecting the free interior (6) of the hollow shaft has first and second guide edges (8, 9) extending in the radial direction.

7. release lever (2, 2 ', 2 ") according to claim 1, characterized in that the guide pin (7) has a trapezoidal cross-sectional contour.

8. composite between a trip unit (1) and at least one circuit breaker, wherein the trip unit (1) is laterally queued to the at least one circuit breaker and wherein the trip unit (1) and the at least one circuit breaker are coupled to a coupling system according to claim 1.