WO2013057147A1

WO2013057147A1 - Range of multi-pole circuit breakers

Info

Publication number: WO2013057147A1
Application number: PCT/EP2012/070587
Authority: WO
Inventors: Gregor FLEITMATANN
Original assignee: Eaton Electrical Ip Gmbh & Co. Kg
Priority date: 2011-10-17
Filing date: 2012-10-17
Publication date: 2013-04-25
Also published as: CN103875053B; EP2584582A1; EP2769399B1; BR112014009331A2; CN103875053A; EP2769399A1

Abstract

The invention relates to a range of multi-pole circuit breakers of different sizes and different nominal current capacity. In order to reduce the cost in terms of deployable U/A tripping devices, a U/A tripping device (10) of the same type is provided for all sizes (1, 2, 3) of the range. For this purpose, at least one model size (3) of a higher rated current capacity is equipped with a power storage device (52), which is arranged in the functional chain between the trip plunger (16) of the U/A tripping device (10) and the lock pawl (43) of the latching mechanism (25). Furthermore, in the at least one model size (3) equipped with the energy storage device (52), a second release element (35) is connected to the latching mechanism (25) thereof, said second release element effecting the release of the U/A tripping device (10) during activation of the circuit breaker at an earlier stage than is the case in the other model groups (1, 2) using a first release element (34) connected to the latching mechanism (24) thereof.

Description

CONSTRUCTION SERIES MULTIPOOL POWER SWITCHES

The invention relates to a series of multi-pole circuit breaker different sizes different nominal current capacity with an undervoltage or shunt trip, hereinafter referred to as U / A trigger.

As is known, circuit breakers other than thermomagnetic actuators may also be equipped with a U / A trigger, e.g. according to document EP 619590 Bl.

An undervoltage release is an electromagnet which actuates the tripping mechanism of the circuit breaker when the power is interrupted. In the current-carrying state, the system is in rest position. The control takes place with a normally closed contact. Undervoltage release trigger in case of power failure, the switch to z. B. to prevent the automatic restart of engines. A shunt release is an electromagnet which, when a voltage is applied, triggers the tripping mechanism of the

Circuit breaker actuated. When de-energized, the system is at rest. The activation takes place with a closing contact. Shunt releases are used for remote release when z. B. a voltage interruption not to

automatic shutdown. If the undervoltage release is de-energized or if the residual current release is energized, the circuit breaker can not be switched on. For this purpose, when switching on the circuit breaker via the switch lock of the U / A trigger leading to touching the main contacts of the

Release circuit breaker. The disadvantage is that for circuit breaker different nominal current capacity because of the increasing size with increasing size of the required tripping energy differently designed U / A triggers must be used. The required number of types of U / A triggers requires a lot of effort for the large number of individual parts and their logistical integration into the manufacturing process of the U / A triggers. In order to achieve the required high tripping forces or tripping paths for circuit breakers of higher nominal current capability, US Pat. No. 5,512,720 A proposes a U / A release in which a force accumulator is integrated. The energy storage consists of a latch lever, a release lever and a tension spring. By switching on the circuit breaker is the power on the

Switch lock on the one hand, the latch lever against the force of the tension spring latched to the release lever and thus tensioned the energy storage and on the other brought the armature of the U / A release in its rest position. When activating the U / A trigger is brought by the armature of the latch lever out of the engagement area with the release lever. With the released force of the tension spring causes the

Triggers the triggering of the switch latch with an energy that far exceeds the energy that can be applied by the solenoid of the U / A trigger. The disadvantage is that the proposed U / A trigger requires many items due to the integrated energy storage, takes up a large amount of space and that for

Circuit breaker with low nominal current capacity of the energy storage is not required or otherwise occupied space.

From the document DE 4202049 Cl is a thermal release for

Power switching devices known. The thermal release contains in the main flow paths bimetallic strip, which bend in overcurrent and act on a trip bridge, adjusting means for setting the trigger conditions and a force accumulator, which consists of a latch lever and a clamping lever, which can be mutually braced by means of a tension spring. If the overcurrent exceeds the set value

Overload limit, the trip bridge is moved and pivots the pawl lever from the engagement area with the clamping lever, causing it under the influence of the tension spring performs a movement that triggers the switching mechanism of the power switching device, which has the opening of the main contacts of the power switching device result. When resetting the power switching device from the tripped state acts connected to the switching mechanism clamping element against the force of the tension spring on the clamping lever and transferred the energy storage again in the clamped state. The invention has for its object to reduce the design and manufacturing costs in terms of the use of U / A triggers in a circuit breaker series. Starting from a circuit breaker series of the type mentioned, the object is achieved by the features of the independent claim, while the dependent claims advantageous developments of the invention can be seen. As a result, a U / A release of the same design is provided for all sizes of the series, so that at least one larger size of the series is available

Nennstromvermögens is equipped with a power storage, which consists of a

Release lever, a latch lever and a tensioned tension spring between both whose release lever is acted upon to latch with the latch lever from the latch when resetting from the tripped condition against the force of the tension spring, that in the at least one equipped with energy storage size on the one hand, both the thermal release, The magnetic release and the U / A trigger with the pawl lever to relax the energy accumulator in operative connection and on the other hand, the release lever with the switch lock triggering in

Active connection occurs and that in the at least one equipped with power storage size instead of the effective in the other sizes first release element associated with the switching lock second release element with the U / A trigger to release the same is provided, wherein the effective before closing the main contacts release position of the second release element with respect to

Release position of the first release element is leading the way, all breakers of the series can be equipped with the same U / A release. This U / A trip unit is designed so that its tripping energy is sufficient to transfer the non-powered circuit-breaker of the series to the tripped state. In the case of the at least one circuit breaker of the series, which is equipped with a force accumulator, the tripping energy of this U / A trigger in conjunction with the energy accumulator is in turn sufficient for triggering this circuit breaker. By the inventive series multi-pole

Circuit breaker is the cost of manufacture, storage and assembly the parts of the integrated U / A trigger significantly reduced. The effort for the energy storage is irrelevant, since such is usually provided in the sizes higher rated current capacity for the thermal tripping. Depending on the spatial conditions inside the at least one

Circuit breaker higher Nennstromvermögens and the necessary tripping paths and forces to trigger the switching mechanism, it is advantageous to one with the

Magnetic armature of the U / A trigger coupled release plunger to interact either directly or indirectly with the latch lever. In the latter case, it is expedient to store an intermediate slide or an intermediate lever between the trigger plunger and latch lever.

It is also advantageous that, depending on the spatial conditions inside the at least one circuit breaker higher nominal current capacity and the

required triggering paths and forces to trigger the switching mechanism of the trigger lever of the energy storage device is either directly or via an intermediate member triggering operatively connected to the switching mechanism.

Further details and advantages of the invention will become apparent from the following, explained with reference to figures embodiment. Show it

Figure 1: an inventive series in perspective view;

Figure 2: belonging to the series of FIG. 1 U / A trigger in perspective

Presentation;

FIG. 3 shows a size of low rated current capacity from the series according to FIG. 1 in a broken perspective sectional representation;

Figure 4: the tripping action chain of the size of FIG. 3 in perspective

Presentation;

Figure 5: a detail of the size of FIG. 3 in the region of its switching mechanism in

broken sectional view;

Figure 6: a size higher rated current capacity from the series of Figure 1 in broken perspective sectional view. Figure 7: the tripping action chain of the size of Figure 6 in perspective.

8 shows a detail of the size of FIG. 6 in the region of its switching mechanism in FIG

broken sectional view.

Fig. 1 shows a series of three-pole circuit breaker, which consists of three sizes 1, 2 and 3 different Nennstromvermögens. Of the three sizes 1, 2 and 3, the small size 1 has the lowest nominal current capacity, the medium size 2 the medium and the large size 3 the highest rated current capacity. Each size 1, 2 and 3 is of a switch housing 4, 5 and 6 of insulating

Form material surrounded, from the front of a control knob 7, 8 and 9 projects, with the main contacts of the circuit breaker can be closed and opened via a switching mechanism. At the respective switch housing 4, 5 and 6, connections for three main conductors are accessible from above and from below. In contrast to Figures 3 to 8, the sizes 1, 2 and 3 in Fig. 1 are shown in a natural scale ratio.

Each of the three sizes 1, 2 and 3 is optionally equipped with a U / A release 10 of the same design, which can be designed as an undervoltage release or as a shunt release. The U / A trigger 10 is in one of the front of the

Switch housing 4, 5 and 6 accessible receiving space 11 to use and connected to outwardly guided control lines 12.

The U / A trigger 10 of the same type is shown in Fig. 2 on an enlarged scale. The U / A trigger 10 is surrounded by a trigger housing 14 made of insulating molding material. From the trigger housing 14 reaches firstly the outer end of a connected to the armature of the U / A trigger 10 release plunger 16 and on the other the Betätigungsfiäche 19 of a release lever. If, upon the occurrence of a trip condition, the U / A trigger transitions from its idle state to the trip state, the movement of the trigger plunger 16 causes the latch to transition to the tripped state. The main contacts of the circuit breaker are forced open. Before switching the circuit breaker back on, the switch lock must be reset using the control buttons 7, 8 or 9. At rest, the release lever holds the Trigger plunger 16 and thus the armature while in the rest position until the circuit breaker releases the armature of the U / A trigger 10 via the release lever in the course of switching on the circuit breaker, so that in the event of a trigger condition (undervoltage or working current), the release plunger 16 can move from the rest position.

In the following, the size 1 with low Nennstromvermögens will be described with reference to Figures 3 to 5 of the inventive series. That over his

Swing lever 22 associated with the control knob 7 switch lock 24 causes the closing and opening of the main contacts, of which in Fig. 3, a fixed contact 26 and a movable contact 28 which moves in a equipped with arc quenching 30 contact space 32 to see an outer Schaltpols are. Fig. 4 shows how in the resting state of the U / A trigger 10 of the trigger plunger 16 and the magnet armature 17 connected thereto is held on the release lever 20 in its rest position. For this purpose, the release lever 20 mounted in the trigger housing 14 and designed as a two-sided lever is acted upon by a trigger tension spring 18 unilaterally fixed in the trigger housing 14 (in the illustration of FIG. 3 in the clockwise direction and in the illustration of FIG. 4 in the counterclockwise direction). On the pivot lever 22, a first release member 34 is attached. Of the

Swivel lever 22 is supported in the switch lock 24 in a pivot bearing 36 (FIG. 5). When the circuit breaker is turned on, the pivot lever 22 is pivoted, i. according to Fig. 3 and Fig. 5 in the counterclockwise direction. In the course of the switch-on movement of the pivot lever 22 reaches a designated by the reference numeral 38

Release angle and shortly thereafter its designated by the reference numeral 40

Tilt angle at which the switch latch 24 can tip over to close the main contacts. Upon reaching the release angle 38 of the pivot lever 22, the first release element 34 lays against the actuating surface 19 of the U / A trigger 10 and starts leading prior to closing the main contacts to release the release lever 20 against the spring force of the Auslöserzugfeder 18 of the trigger plunger 16, by the release lever 20 of FIG. 3 in the counterclockwise direction and according to FIG. 4 in

Is pivoted clockwise. As a result, the armature 17 is released, so that in the event of a trigger situation leading the closing of the main contacts Magnetic armature 17 and trip rod 16 can move from its rest position (according to FIG. 3 to the right and according to FIG. 4 to the left). In the absence of a trigger situation, however, remain the armature 17 and the trigger plunger 16 in its rest position. In the case of a triggering situation, the release plunger 16 strikes a lock pawl 42 latchable with the latching mechanism 24. With its rotary movement, the latch pawl 42 releases from the latching mechanism 24, so that it switches over to the tripped state before the main contacts are closed. For each switching pole is both a thermal

Trigger provided with a bimetallic strip 48 and a magnetic release with a hinged armature 50, which also act triggering when an overload or a short circuit. For this purpose, one of a mounted in the switch housing 4 release shaft 44 is pivoted as shown in FIG. 4 against the restoring action of a torsion spring 46 in the counterclockwise direction and unlatches by means of a protruding from the trigger shaft 44 extension 52, the lock pawl 42 from the switch lock 24. In Fig. 3 and Fig. 4, not all bimetallic strips 48 and hinged anchors 50 of all three poles can be seen or shown for better illustration.

In the off or triggered state stands by the occupied

Angular position of the pivot lever 22, the first release element 34 out of communication with the actuating surface 19, so that by the action of the trigger tension spring 18 of the

Release lever 20, the trigger plunger 16 and the magnet armature 17 again take the rest position shown in Fig. 3 and Fig. 4.

The size 2 average rated current capacity also has on the size of 1 described and cooperating functional elements and can be equipped with the U / A trigger 10 type described above. Therefore does not need to be discussed in detail on the size 2.

Hereinafter, the size 3 with high Nennstromvermögens will be described with reference to Figures 6 to 8 of the inventive series. Likewise and the same effect as in size 1, the size 3 has the following details: a in

Switch housing 6 mounted switch lock 25 with a connected to the control knob 9 and mounted in a pivot bearing 37 pivot lever 23; Farther fixed contacts 27, movable contacts 29, arc extinguishing plates 31 in each case a contact space 33; furthermore a verklinkbare with the latching mechanism 25

Locking pawl 43 and further thermal release with bimetallic strip 49 and magnetic release with hinged anchors 51. In FIG. 6 and FIG. 7, not all bimetallic strip 49 and hinged armature 51 of all three poles can be seen or shown for better illustration.

In contrast to the other two sizes 1 and 2, the size 3 in addition to an energy storage 52. This energy accumulator 52 consists of a switch housing 6 with a latch lever 56 pivotally mounted with its pawl lever axis 54, also in the switch housing 6 with a tripping lever 60 pivotally mounted with its trigger lever axis 58 and a tension spring 62 in the form of a spiral compression spring, under the action of which pawl lever 56 and Release lever 60 are held in mutual tensioned state. The bimetallic strip 49 and the hinged armature 51 act in overload or short circuit on suitably arranged extensions 64 and 65 of the pawl lever 56. The latch lever 56 is pivoted in the illustration of FIG. 6 in the clockwise direction and in FIG. 7 in the counterclockwise direction. By this pivoting, the release lever 60 releases from the

Tension with the pawl lever 56 and is under the action of the

Relaxing tension spring 62 pivoted in the illustration of FIG. 6 in the clockwise direction and in FIG. 7 in the counterclockwise direction. The release lever 60 hits due to the relaxing tension spring 62 with sufficient force on the lock pawl 43 of the switching mechanism 25 and brings this to trigger. In the switch housing 6, an intermediate lever 67 is further mounted between the U / A trigger 10 and the latch lever 56. If the U / A trigger 10 reacts to a trigger situation, its trigger plunger 16 strikes the free end of the intermediate lever 67, pivots it in the clockwise direction according to FIG. 7, so that the intermediate lever 67 strikes the latch lever 56. As a result, the energy storage 52 is relaxed and the

Switch lock 25 triggered.

The switching mechanism 25 size 3 requires higher forces to trigger than the switching mechanism of sizes 1 and 2. These higher forces can be used by the Bimetallic strip 49 and hinged anchors 51 as well as for the entire series

provided U / A triggers 10 are not applied by itself. The

Interposing the force accumulator 52 between the described triggers and the lock pawl 43 makes it possible, using the stored force of the relaxing tension spring 62, sufficiently high forces to trigger the switching mechanism lock 25 Series 3 have available. Here is a special advantage

It should be emphasized that the U / A release 10 of the same type and size can be used for all series 1, 2 and 3. To reset the force accumulator 52 after a trigger case hits when

Resetting operation of the switching mechanism 25, which must precede the switch-on, connected to the pivot lever 23 reset nose 66 on the release lever 60 (in Fig. 8 with movement to the right) and thereby brings the release lever 60 against the force of the tension spring 62 back into the tense Engaging with the

Pawl lever 56. The energy storage 52 is now available for a new triggering process.

Instead of the first release element 34 on the pivot lever 22 of the switch lock 24 in the small size 1 (and also correspond to the average size 2) is on the pivot lever 23 of the switch lock 25 in the large size 3, a second

Release member 35 attached. When the circuit breaker is turned on, the pivot lever 23 is pivoted, i. as shown in FIG. 8 in the counterclockwise direction. In the course of the switch-on movement of the pivot lever 23 reaches a designated by the reference numeral 39 release angle and then its designated by the reference numeral 41 tilt angle at which the switching mechanism 25 can tip over to close the main contacts. Upon reaching the release angle 39 of the pivot lever 23, the second release element 35 sets to the actuating surface 19 of the U / A trigger 10 and starts leading the closing of the main contacts, the release lever 20 against the

Spring force of the Auslöserzugfeder 18 of the release plunger 16 to solve by the release lever 20 is pivoted in accordance with FIG. 7 in the clockwise direction. As a result, the magnet armature 17 is released, so that in the event of a trigger situation leading before the closing of the main contacts magnet armature 17 and trip rod 16 can move from its rest position (as shown in FIG. 7 to the left). In the absence of a Tripping situation, however, remain the armature 17 and the trigger plunger 16 in its rest position.

In the off or triggered state stands by the occupied

Angular position of the pivot lever 23, the second release element 35 out of connection with the actuating surface 19, so that by the action of the Auslöserzugfeder 18 of the release lever 20, the trigger plunger 16 and the armature 17 again take the rest position shown in Fig. 6 and Fig. 7. A comparison between Figures 5 and 8 reveals that the angular distance between the release angle 39 and tilt angle 41 in the key switch 25 size 3 is much greater than the comparable angular distance between the release angle 38 and tilt angle 40 in the key switch 24 of size 1. Das in other words, that the release of the U / A trigger 10 in the course of the power-on in size 3 with greater lead over the closing of the main contacts than in the size 1 (and in size 2). This larger lead in the size 3 compensated in time the extended chain of effects, the addition of energy storage 52 and intermediate lever 67 between U / A triggers 10 and

Lock pawl 43 results. Otherwise, the mentioned effect chain would lead to a delayed releasing of the U / A release and is caused by the switch-on direction of the

Swing lever 22 and 23 (according to Figures 5 and 8 in the counterclockwise direction) advanced arrangement of the second release element 35 against the first release element 34 compensated in time. The invention described above finds application for the protection of

Low-voltage switchgear and consumers.

The present invention is not limited to the embodiments described above, but also includes all the same in the context of the invention

Embodiments. Thus, for example, the invention can be designed such that the release plunger 16 of the U / A release 10 acts directly on the latch lever 56 of the energy accumulator 52 without the use of an intermediate lever. It is also in accordance with the invention, if instead of an intermediate lever 67, an intermediate slide between Release plunger 16 and latch lever 56 is arranged. Also within the meaning of the invention, a stored in the switch housing 6 and between the release lever 60 of the energy accumulator 52 and the lock pawl 43 mounted intermediate member.

LIST OF REFERENCE NUMBERS

1; 2; 3 size 32; 33 contact space

4; 5; 6 switch housing 34; 35 release element

7; 8th; 9 control knob 36; 37 pivot bearings

10 U / A triggers 38; 39 release angle

11 receiving space 40; 41 tilt angle

12 control lines 42; 43 Pawl

14 Release housing 44 Release shaft

16 trip plunger 46 torsion spring

17 magnet armature 48; 49 bimetallic strips

18 trigger tension spring 50; 51 hinged anchor

19 B action surface 52 Energy storage

20 release lever 54 ratchet lever axis

22; 23 pivot lever 56 latch lever

24; 25 Switch lock 58 Release lever axis

26; 27 fixed contact 60 release lever

28; 29 movable contact 62 tension spring

30; 31 arc plate 64; 65 extension

66 Reset nose 67 Intermediate lever

Claims

claims

Series of multi-pole circuit-breakers of different sizes with different nominal current capacities, the individual sizes (1, 2, 3) being each in a switch housing (4, 5, 6)

- A switch lock (24, 25) for closing and opening of main contacts

exhibit,

- With the switching mechanism (24) triggering operatively connected thermal and

magnetic triggers (48; 50) for causing the main contacts to open when overcurrents occur,

- If necessary, one with the switching mechanism (24) triggering operatively connected U / A trigger (10) to prevent the occurrence of an undervoltage or a working current in the U / A trigger (10) closing the main contacts or opening the To allow main contacts, including the U / A trigger (10) by means of a with the switch lock (24) connected first

Release element (34) is released in advance before closing the main contacts,

characterized,

- that for all sizes (1, 2, 3) of the series a U / A release (10) of the same design is provided,

- that from the series at least one size (3) higher

Rated current capability is provided with a force accumulator (52) consisting of a pawl lever (56), a trigger lever (60) and a tension spring (62), wherein the trigger lever (60) for effecting the tensioned state with the pawl lever (56) from the switch latch (25) when reset from the tripped state against the force of the tension spring (62) is acted upon,

- That in the at least one with energy storage device (52) equipped size (3) on the one hand, both the thermal release (49), the magnetic release (51) and the U / A trigger (10) with the pawl lever (56) for relaxing the Force accumulator (52) come into operative connection and on the other hand, the trigger lever (60) under the action of the relaxing tension spring (62) with the switching mechanism (25) triggering operatively connected and

- that in the case of the at least one with energy storage device (52) equipped size (3) instead of the first release element (34) acting on the other sizes (1; 2), a second release element (35) connected to its switch lock (25) is provided for releasing the U / A release (10), the front of the

Closing the main contacts effective release position (39) of the second release element (35) relative to the release position (38) of the first

Release element (34) is leading to a greater extent.

Series multipole circuit breaker according to claim 1, characterized in that one with the magnet armature (17) of the U / A trigger (10) coupled

Trigger plunger (16) is directly operatively connected to the latch lever (56).

Trigger plunger (16) is indirectly operatively connected to the latch lever (56).

Series multipolar circuit breaker according to claim 3, characterized in that between the trigger plunger (16) and latch lever (56) an intermediate slide linearly in the switch housing (6) is mounted.

Series multipole circuit breaker according to claim 3, characterized in that between the trigger plunger (16) and latch lever (56), an intermediate lever (67) is pivotally mounted in the switch housing (6).

Series multi-pole circuit breaker according to one of the preceding claims, characterized in that the release lever (60) of the energy accumulator (52) is directly triggering with the switching mechanism (25) operatively connected.

Series multi-pole circuit breaker according to one of the preceding claims, characterized in that the release lever (60) of the energy accumulator (52) via a in the switch housing (6) mounted intermediate member triggering with the switching mechanism (25) is operatively connected.