DD272165A1 - ELECTROMAGNETIC RELEASE SWITCH FOR CIRCUIT BREAKER - Google Patents

Abstract

The invention relates to electromagnetic Ausloeser for circuit breakers that accomplish the tripping of the circuit breaker in the absence or applied control voltage. The aim of the invention is an uncomplicated, compact arrangement for the electromagnetic release of a circuit breaker with minimal electrical power consumption. According to the invention this is achieved by a fixed at the ends of the form of spring, which is held at pressed anchor of the magnetic circuit with a small force in Ausloeserichtung. Fig. 1

Description

Position of the switching shaft in the closed state of the switching pieces and in case of drop in the holding force of the magnetic circuit in the arrangement as undervoltage release or when a trigger pulse in the arrangement as shunt trip, takes place during the armature movement, an increase in the restoring force.

Due to the inventive arrangement of the form spring in both arrangements, the release force exceeds the force provided by the electromagnet available.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the drawing show:

Fig. 1: Arrangement of the audiometer for an undervoltage release in position A.

Fig. 2: Arrangement of the trigger for an undervoltage release in position B.

Fig. 3: Arrangement of the trigger for a shunt trip in position A.

Fig. 4: Arrangement of the trigger for a shunt trip in position B.

a) Undervoltage decoder

By the movement of the switching shaft 9 during the opening operation of the main contacts 12, the operating lever 4 is brought by the resilient element 5 in the position A. The armature 3 connected to the actuating lever 4 via the plunger 11 is pressed against the inner pole 8 of the triggering magnet. The coupled with the armature 3 and fixed on both sides form spring 6 with jump characteristic is brought to just before their jump point. Since the coil 1 of the release magnet is energized, the shape spring 6 is held by the holding force of the trigger magnet in this position, where it generates only a small force component in the direction of movement of the armature 3. Consequently, only a small force is applied by the release magnet to hold the form of spring 6. At undervoltage and zero voltage (as a special case of undervoltage), the armature 3 drops off and exerts on the operating lever 4 under action '' he force of the relaxing form spring 6 a left-handed moment, whereby the release pin 10 is actuated by the trigger element 7 (position B ).

b) Workload reader

When installed as a shunt release, the same parts and assemblies as in a) are used. The adaptation to the changing mode of operation is essentially achieved by the rotation of the release magnet by 180 °. By the movement of the switching shaft 9 during the opening operation of the main contacts 12 of the actuating lever 4 is brought by the resilient member 5 in the position A. The armature 3 connected to the actuating lever 4 via the plunger 11 is moved by the inner pole 8 of the release magnet to a certain amount corresponding to its working stroke, which is fixed and limited by a stop 13 moves. In this case, the coupled with the armature 3 and fixed on both sides of the form spring 6 with jump characteristics until shortly over their jump point, that is brought by their dead center, so that a secure self-locking is ensured in this position. This arrangement is ready for work. When triggered, the coil 1 of the trigger magnet receives a voltage pulse, whereby the armature 3 attracts under the influence of the magnetic force generated in this way. In the process, the shape spring 6 is brought back again via its dead center position at the beginning and thus begins to relax abruptly. Anke; 3 and form spring 6 exert on the actuating lever 4 a left-handed torque, wherein the trigger pin 10 is actuated by dab trigger element 7 (position B).

It has been stated that the release force is essentially determined by the shape of spring 6 and can be controlled by them both undercurrent and shunt release.

The dimensioning of the magnetic circuit is the same for both arrangements u. is energetically minimized to the force required to hold the form of spring 6 and to bring about the dead center.

Claims (3)

1. Electromagnetic release for circuit breaker, consisting of Mag netkreis, trip coil, operating lever, pressure mechanism and a known form spring, characterized in that the form spring (6) is fixed at the ends, the restoring force when the armature (3) assumes a value which is smaller than the holding force of the trigger magnet and preferably centrally with the armature (3) of the Magnetki cires (2) is coupled, which at the moment of triggering with the release pin (10) is connected and that the spring force in the release direction compensating resilient element (5) is engaged with the armature (3). 2. Electromagnetic actuator according to claim 1, characterized in that the shaped spring (6) is preferably formed as a flat-shaped spring disc-shaped, with jump characteristic. 3. Electromagnetic actuator according to claim 1, characterized in that the shaped spring (6) is designed as a wire form spring with jump characteristic. For this 2 pages drawings Field of application of the invention The invention relates to triggers for electrical switching devices that accomplish depending on the task whose triggering when the operating voltage drops a predetermined value or in the presence of a tripping pulse. Characteristic of the known state of the art In order to protect consumers against damaging effects of undervoltage or uncontrolled restart after power failures, switching devices are equipped with undervoltage releases. Since they are at auxiliary voltage during the entire duty cycle, and only become active when the voltage to be monitored is removed by acting on the switching mechanism when the armature restoring spring is released, a minimum power consumption is to be sought. For this purpose, it is known that the current consumption to the holding current of the shutter to be defined by 1. an economy circuit by means of auxiliary contact is used or 2. the armature is mechanically moved during the switching to the holding position. All known technical solutions have the disadvantage that the spring force decreases proportionally to the path by covering the path in the fall and thus the usable for actuating (triggering) of the switching mechanism force is always smaller than the required holding force of the trigger, the opposite would be desirable. With very small release force of the magnet remain only the possibilities to increase the performance of the electromagnetic release, which contradicts the task mentioned or interpose a separate power storage, which means an increased cost of individual parts. In both cases, the size is adversely affected. In contrast to undervoltage releases, the power consumption is of secondary importance for the shunt releases provided for the remote tripping of switchgear, as only an erroneous pulse operation is necessary. To ensure this, it is well known to interrupt them via auxiliary switch immediately after tripping, whereby an overload in case of operation is made possible and the size of acceptable sizes, while at any time the required release force is achieved. In order to realize a rational production, the repeatability of the individual parts is largely sought. In the case of the described electromagnets and various accessories, this prohibits itself. An advantageous solution is the arrangement according to DD-PS 45765, in which an arrow-shaped lever depending on the trigger on both sides trigger a power storage is able. The disadvantage here is the spatial and item-wise extent of the arrangement. The described advantages of the existing external Umstellmöglichkeit do not come fully to fruition, since the task (application as U or Α trigger) should be known in the rule before commissioning. Object of the invention The aim of the invention is an arrangement with minimal size and number of parts and low degree of complexity of the items to provide a mechanical energy at a drop of an auxiliary electric voltage or in the presence of a trigger pulse, the permanent electrical power consumption should also be a minimum. Explanation of the essence of the invention The invention has for its object to provide an auxiliary release, which can be used either as undervoltage and as a shunt release and in which the required operating force can be kept small. According to the invention this is achieved by a changing restoring force of the actuating lever, which is effected by a special shape spring whose restoring force reaches a minimum at the moment of the pressed anchor. Due to the opening movement of the switching shaft, the armature is pressed and brought the shape spring to near its jump point, the restoring force of the spring reaches a low value, which corresponds to the holding force of the magnetic circuit. at