EP1562210A2 - Electrical installation apparatus with optimised torques and corresponding triggering methode in the precense of a fault current - Google Patents

Abstract

The device has a trip component (8) movable from a reset position to a trigger position in the event of a fault current by carrying out a trigger movement and a switch lock for converting the trigger movement into a switching movement of a pawl (1) for moving at least one electrical contact (5). The pawl is mounted on a first axle (14b) and rotatable between an ON position and an OFF position. The switch lock has a restoring lever (7) rotatably mounted on a second axle (14c) for moving the trip component to the reset position by moving from a first to a second position. The device has a first coil spring (11) between the pawl and restoring lever. An independent claim is also included for a method of triggering an installation device if there is a fault current.

Description

The present invention relates to an installation device with a trigger component that is in the presence of a fault current under execution of a release movement from a reset position is movable in a triggering position, and a Switch lock for implementing the release movement of the trigger component in a switching movement of a pawl to move at least one electrical contact, wherein the latch on an axle mounted and between an ON position and a OFF position is rotatable. In addition, the concerns The present invention provides a method of triggering an installation device in the presence of a fault current through execution a triggering movement of a trigger component of a Reset position to a release position and unlock a pawl in ON position by the tripping motion. In particular, the present invention is suitable for RCCB (fault current / line circuit breaker).

a) dem Summenstromwandler zur Fehlerstromerfassung;

b) dem FI-Auslöser zur Umsetzung der elektrischen Messgröße in eine mechanische Entklinkung. In seiner Ruhestellung, die einer fehlerfreien Anlage entspricht, hält ein magnetischer Kraftfluss im Haltemagnet (FI-Auslöser) einer Federkraft entgegenwirkend einen Anker fest. Im Fehlerfall wird der magnetische Kraftfluss soweit geschwächt, dass die Federkraft den Anker von den Polflächen abzieht und der abfallende Anker die Verriegelung eines Schaltschlosses (z. B. durch Klinke und Halbwelle) löst. Die Kontakte des Schalters werden geöffnet und der Strompfad getrennt.

c) dem Schaltschloss mit dem angekoppelten Kontaktsystem, über das einerseits die Kontakte geöffnet bzw. geschlossen und andererseits die hohen Kontaktkräfte auf möglichst kleine Auslösekräfte reduziert werden; und

d) dem magnetischen und thermischen Auslösesystem für den Leitungsschutz.

An RCCB consists of 4 main functional modules:

a) the summation current transformer for fault current detection;

b) the FI trigger to implement the electrical parameter in a mechanical unlatching. In its rest position, which corresponds to a fault-free system, a magnetic flux in the holding magnet (FI trigger) of a spring force counteracts an anchor firmly. In the event of a fault, the magnetic flux is weakened to such an extent that the spring force pulls the armature away from the pole faces and the falling armature releases the locking mechanism of a switching mechanism (eg by pawl and half-wave). The contacts of the switch are opened and the current path is disconnected.

c) the switching mechanism with the coupled contact system, on the one hand, the contacts opened or closed and on the other hand, the high contact forces are reduced to the smallest possible triggering forces; and

d) the magnetic and thermal tripping system for line protection.

On the one hand, there is a very high contact force in a RCD circuit breaker necessary, on the other hand, however, from technical and economic reasons a trigger circuit with very small transducer and holding magnet (i.e. Triggering forces) is a very large one Gear ratio required in the switch lock. To the triggering must be certain functional parts of the switching mechanism, z. B. jack and half-wave back to a position where they are locked so that one Switching on the device, d. H. Close the contacts via a start lever or coupling member is possible again. Furthermore, the anchor of the trigger must be re-applied and released when the device is switched on.

For combination devices, such as the mentioned RCCB devices, is additionally z. B. on the latch a circuit breaker LS unlocked. For the safe function of the switch lock is an exact tuning of the forces and ways of the Function elements required to each other.

Usually, the required high gear ratio by switching locks with knee joints or other Gear elements and realized in PCB solution. The necessary Tripping and restoring forces are for the individual Functions due to several, assembly-unfriendly springs (Tension or torsion spring) generated. This is an undesirable one Force increase or decrease with increasing or decreasing Travel calculated.

For the realization of such switching locks is also a relatively large number of items required. Of Further, often the L and N contacts become common Support part (shift shaft) stored or own both contacts the same fulcrum. As a consequence, that the degree of freedom for the arrangement of the FI modules is severely restricted.

The object of the present invention is therefore to to propose an installation device with fault current release, optimized in its power storage, the movement and, if possible, the number of individual parts of the switch lock is reduced.

According to the invention this object is achieved by an installation device with a trigger component in place a fault current under execution of a tripping movement of a reset position is movable to a release position, and a switch lock for implementing the release movement of Trigger component in a switching movement of a pawl for Moving at least one electrical contact, wherein the Latch mounted on a first axle and between an ON position and an OFF position is rotatable, and wherein the Switch lock comprises a reset lever, which is connected to a rotatably mounted second axis and with the trigger component is movable to the reset position by the reset lever from a first position to a second position is moved, a first tension spring between a first attachment point on the latch and a second attachment point is tensioned on the return lever, the first tension spring on the reset lever in the first position a substantial lower torque causes than in the second position and the first tension spring on the pawl in the ON position lower torque than in the OFF position.

In addition, the invention provides a method for triggering an installation device in the presence of a Fault current by executing a tripping of a trigger component from a return position to a release position, and unlocking one in ON position Latch by the release movement, as well as turning the latch by the spring force of a first tension spring from the ON position in an OFF position, which by the spring force generated torque increases during this rotational movement and a Switching the installation device by turning the Pawl is triggered, turning a reset lever, prompted through the switching process, with feedback of the trigger component in the return position, wherein the first tension spring also causes the turning of the reset lever and that of the tension spring on the return lever torque applied this rotation in the reset position increases.

The advantage of the invention is that in the realization the energy storage device of an installation device the number The items can be reduced, which is positive on the manufacturing costs reflected. The reduction of Parts can be especially through the multiple function certain items, such. B. the first spring reach. An advantage of the invention is also that a Optimization of the power budget through variable lever arms achieved during the switching on or off of the device can be.

In a preferred embodiment, the pawl in the ON position by a half-wave with suitable latching surface locked and through one with the help of the trigger component initiatable rotary motion of the half-wave unlocked. With the help of this half-wave it is possible through the Relatively low forces the trigger clearly to overcome higher Verklinkungskraft the latch.

The installation device according to the invention can in a special Embodiment an LS-switching device and an N-switching device have, by a connecting element coupled together. This can, for example, a FI / LS (1 + N) combination device can be realized.

Conveniently, a pull rod connects said connection element or a component of the LS or N-switching device with the reset lever, so that in the off State of the LS or N-switching device of the reset lever moved to the second position. In this second position the reset lever pushes the trigger component into its Reset position. This means that it is with the drawbar is possible, the switch-off movement of the LS or N-switching device to use with the reset lever the trigger component to move to the reset position.

If there is an N-switching device in the installation device is, it has an N contact whose contact force applied by a second tension spring and the at his Opening movement to push the latch to the ON position can be designed. In this way, the N-contact gets also an additional function, whereby the number of Individual parts of the installation device can be reduced again can.

FIG 1

ein FI-Schaltschloss eines FI/LS-(1+N)-Schutzschalters in der Schalterstellung "EIN";

FIG 2

einen Ausschnitt des FI-Schaltschlosses in der Stellung von FIG 1 mit abgeänderter Bauform;

FIG 3

das FI-Schaltschloss von FIG 1 bei FI-Auslösung; und

FIG 4

das FI-Schaltschloss in der auf den N-Kontakt bezogenen Schalterstellung "AUS".

The present invention will now be explained in more detail with reference to the accompanying drawings, in which:

FIG. 1

a residual current circuit breaker of a FI / LS (1 + N) circuit breaker in the "ON"position;

FIG. 2

a detail of the FI switching mechanism in the position of FIG 1 with modified design;

FIG. 3

the FI switching mechanism of FIG 1 at FI tripping; and

FIG. 4

the FI-switch lock in the N-contact related switch position "OFF".

The embodiments described in more detail below represent preferred embodiments of the present invention represents.

a) durch Einsatz von Multifunktionsfedern und

b) durch veränderliche Hebelarme an den einzelnen Funktionselementen während des Bewegungsablaufes realisiert wurde.

A switching mechanism with a contact system of a FI / LS (1 + N) circuit breaker is shown in FIGS. 1 to 4, in which a reduction in the number of parts and the required gear ratio in the power budget

a) by using multifunctional springs and

b) was realized by variable lever arms on the individual functional elements during the movement sequence.

Figures 1, 3 and 4 show the switch lock with the contact system in 3 different switch positions.

In Figure 1, the protective switching device is in a so-called rest position corresponding to a switch position "ON", in which the N-contact 5 and the L-contact, not shown, abut the respective mating contact. A pawl 1 and a half shaft 2 are locked together by a latching surface 3 formed on the half shaft 2. It sets a latching force F ₆ on the Verklinkungsfläche 3, which is caused by a force acting on the pawl 1 multi-function spring 11.

The half-wave 2 is on an axis 14a and the pawl. 1 rotatably mounted on an axle 14b. Via a connecting element 4 is when switching on the LS contact, not shown at the same time the N-contact 5 is turned on. This Connecting element 4 allows a very variable arrangement of N contact 5 in the device. Furthermore, when switching on the Device via a suspended in the connecting element 4 drawbar Fig. 6 shows a return lever rotatably mounted on an axle 14c 7 away from a plunger 8 of a trigger 9. Of the Tappet 8 of the trigger 9 is released and can in case of error Release the catch 1 / half-shaft 2. The drawbar 8 can also be at another, any position of the N-contact 5 or on a patch on the N-contact Additional part 10 are arranged according to FIG 2.

a) das für die Entriegelung des LS-Schaltschlosses erforderliche Auslösemoment M₁ an der Klinke 1 und

b) das erforderliche Rückstellmoment M₂ am Rückstellhebel 7 für den zur Fehlerstromauslösung vorgesehenen Auslöser 9 erzeugt.

A multi-function spring 11 is clamped between a molded-in to the pawl 1 suspension point 12 and an integrally formed on the return lever 7 Einhängezapfen 13. By this arrangement is via the spring 11 according to FIG. 3

a) required for the unlocking of the LS switch lock release torque M ₁ on the pawl 1 and

b) generates the required restoring moment M ₂ on the reset lever 7 for the trigger 9 provided for the fault current release.

This arrangement has the advantage that, in the ON position (see FIG. 1), the latching force F ₁ and the restoring force F ₂ (see FIG. 3) can be designed to be very low by a corresponding fixing of lever arms a and b. The lever arm a corresponds to the distance of the force line F _{4 of} the multifunction spring 11 from the axis 14b of the pawl 1 and the lever arm b the distance of the force line F _{4 of} the multi-function spring 11 from the axis 14c of the reset lever 7. The triggering force of the trigger 9 can be correspondingly small be interpreted. An additional load on the N-contact 5 and an increase in the latching forces on the LS switch lock in the ON position is avoided (see FIG. 1) due to the very small lever arm b (return moment M ₂ approaching 0).

A second tension spring 15 generates in the ON position the required contact force F ₃ for the N-contact.

From Figure 3, the advantageous enlargement of the lever arm a on the pawl 1 at FI tripping is visible. In the event of an error, the half-shaft 2 is rotated via the plunger 8 of the trigger 9 and the latching of the pawl 1 is released. By acting from the spring 11 to the pawl 1 force F ₄ , this is put into a rotational movement and the LS-lock via a coupling element 16 which is connected to the pawl 1, unlocked. For the greatest possible safety trigger unwanted drop in torque M _{1 is} avoided on the pawl by the arrangement of the spring 11 shown. The loss of force of the spring 11 when contracting is largely eliminated by the permanent enlargement of the lever arm a. The torque M ₁ thus remains approximately constant.

a) über die Lasche 18, bzw. das Zusatzteil 10 gemäß FIG 2, die Klinke 1 soweit zurückgestellt, dass sie beim Wiedereinschalten des Gerätes mit der Halbwelle 2 verklinkt und

b) die Drehbewegung des Rückstellhebels 7 durch die Zugstange 6 in Richtung Auslöser 9 freigegeben. Die Zugstange 6 kann die Drehbewegung gegebenenfalls unterstützen. Die Hebelarme a und b verändern sich dabei so, dass mit zunehmenden Drehwinkel des N-Kontaktes 5 der Hebelarm a ständig kleiner und der Hebelarm b größer wird. Das hat den Vorteil, dass die aufzubringende Rückstellkraft F₅ (vgl. FIG 3) für die Klinke 1 immer kleiner wird, dagegen die Rückstellkraft F₂ (ebenfalls FIG 3) für das Wiederanlegen des Stößels 8 stetig zunimmt. Der Kräfteverlauf/-haushalt kann daher mit dieser Anordnung der Einzelteile optimal auf die einzelnen Funktionselemente abgestimmt werden.

In FIG 4, the tripping operation is completed and the protection device is in the switch position "OFF". This position is achieved as follows:
After unlocking the LS switch lock, the N-contact 5 rotates about its axis 17 in the OFF position. It will

a) on the tab 18, and the additional part 10 according to FIG 2, the latch 1 set back so far that they latched when restarting the device with the half-wave 2 and

b) the rotational movement of the reset lever 7 released by the pull rod 6 in the direction of trigger 9. The pull rod 6 may optionally support the rotational movement. The lever arms a and b change so that with increasing angle of rotation of the N-contact 5 of the lever arm a constantly smaller and the lever arm b is larger. This has the advantage that the restoring force F _{5 to be applied} (see FIG 3) for the pawl 1 is getting smaller, whereas the restoring force F ₂ (also FIG 3) for the reapplication of the plunger 8 increases steadily. The flow of forces / household can therefore be optimally adapted to the individual functional elements with this arrangement of items.

1. das wirksame Drehmoment an der Klinke 1 während des Bewegungsablaufes annähernd konstant bleibt, wodurch eine größere Auslösesicherheit erzielt werden kann;

2. das Drehmoment am Rückstellhebel 7 für den Haltemagneten des Auslösers 9 von annähernd Null in Schalterstellung "EIN" kontinuierlich auf das erforderliche Moment bis zur Schalterstellung "AUS" ansteigt (FIG 3 und 4) und

3. das erforderliche Rückstellmoment für die Klinke 1 auf ein Minimum reduziert wird, d. h. der N-Kontakt ist mit einer kleineren Kraft F₅ beaufschlagt (FIG 3 und 4).

In summary, it can thus be achieved according to the invention that

1. the effective torque on the pawl 1 remains approximately constant during the course of movement, whereby a greater triggering safety can be achieved;

2. the torque at the reset lever 7 for the holding magnet of the trigger 9 of approximately zero in switch position "ON" continuously increases to the required torque to the switch position "OFF" (Figures 3 and 4) and

3. The required restoring torque for the pawl 1 is reduced to a minimum, ie the N-contact is acted upon by a smaller force F ₅ (Figures 3 and 4).

Claims (10)

Installation device with a trigger component (8) which is movable in the presence of a fault current under execution of a release movement from a reset position to a release position, and a switch lock for converting the release movement of the trigger component (8) into a switching movement of a pawl (1) for moving at least one electrical contact (5), wherein the pawl (1) mounted on a first axis (14b) and between an ON position and an OFF position is rotatable, characterized in that the switch lock comprises a reset lever (7) which is rotatably mounted on a second axis (14c) and with which the trigger component (8) is movable to the reset position by moving the reset lever (7) from a first position to a second position, a first tension spring (11) between a first attachment point (12) on the pawl (1) and a second attachment point (13) on the return lever (7) is stretched, the first tension spring (11) on the reset lever (7) in the first position causes a substantially lower torque (M ₂ ) than in the second position and the first tension spring (11) on the pawl (1) in the ON position causes a lower torque (M ₁ ) than in the OFF position. Installation device according to claim 1, wherein the pawl (1) in the ON position by a half-wave (2) with appropriate Locking surface (3) locked and by a with help the trigger component (8) initiatable rotational movement of the Half-wave (2) can be unlocked. Installation device according to claim 1 or 2, which is an LS-switching device and an N-switching device (5, 17, 18) having, by a connecting element (4) with each other are coupled. Installation device according to claim 3, wherein a pull rod (6) the connecting element (4) or a component of the LS or N-switching device connects to the reset lever (7), so that when switched on the LS or N-switching device the reset lever (7) in the first position is moved. Installation device according to claim 3 or 4, wherein the N-switching device an N-contact (5) whose contact force is applied by a second tension spring (15) and in its opening movement to press the latch in the ON position is designed. A method for triggering an installation device in the presence of a fault current through Performing a triggering movement of a trigger component (8) from a reset position to a triggering position, and Unlocking a pawl (1) in ON position by the release movement, marked by Turning the pawl (1) by the spring force of a first tension spring (11) from the ON position to an OFF position, wherein the torque generated by the spring force (M ₁ ) increases in this rotational movement and a switching operation of the installation device by rotating the Pawl (1) is triggered Turning a reset lever (7), caused by the switching operation, with the trigger component (8) in the return position, wherein the first tension spring (11) causes the turning of the reset lever (7) and the tension spring (11) on the reset lever (11) 7) applied torque (M ₂ ) in this rotation in the reset position increases. The method of claim 6, wherein the pawl (1) in the ON position by a half-wave (2) with suitable latching surface (3) locked and by one with the help of the triggering movement the trigger component (8) initiated rotational movement the half-wave (2) is unlocked. The method of claim 6 or 7, wherein the installation device an LS switching device and an N-switching device has, coupled with each other perform the switching operation. The method of claim 8, wherein the LS or N-switching device the reset lever (7) so entrains that he himself in the on state of the LS or N-switching device located in the first position. Method according to claim 8 or 9, wherein the N-switching device has an N-contact (5) whose contact force (F ₃ ) is applied by a second tension spring (15) and which in its opening movement engages the pawl (1) in the ON position. Position presses.

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