KR910001728B1 - Circuit breaker - Google Patents

Abstract

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Description

Circuit breaker

1 to 3 show a first embodiment of the present invention,

1 is a plan view showing the main part broken.

2 is a plan view showing the main part broken.

3 is a longitudinal sectional view of the main portion taken along the line III-III of FIG. 2;

4 is a perspective view of an iron core for driving a magnetic body according to a second embodiment of the present invention.

5 is a diagram corresponding to FIG. 2 showing another embodiment.

6 to 8 show a conventional example, and FIG. 6 corresponds to FIG.

7 and 8 are perspective views, respectively, of the iron core for driving.

The present invention relates to a circuit breaker having a configuration in which the movable contactor is separated and operated by using the electromagnetic repulsive force of the movable contactor and the fixed contactor.

The circuit breaker is basically configured to open the main circuit by shifting the movable contactor from the closed position to the open position by the trip device when the overcurrent is detected, but recently, the movable contactor is quickly removed from the fixed contactor by using the electromagnetic repulsive force caused by the accident current. The separation operation is provided to improve the overcurrent and breaking performance. An example of the specific structure is shown in FIG. I will explain about this.

1 is a fixed contact fixed in the case 2, one end of which constitutes a terminal to be connected to the main circuit, and the other end of which has a fixed contact 3 at its tip by bending a U-shape. 4 is a movable contact, which extends from the trip device 5.

The movable contact 6 provided at this tip is pressed against the fixed contact 3 of the fixed contact 1.

The fixed contactor 4 is pulled upward by the trip device 5 when overcurrent flows in the main circuit, and is displaced from the closed position to the open position. In addition, since the movable contactor 4 and the fixed contactor 1 are arranged in parallel, and currents flow in opposite directions at opposite portions, an electromagnetic repulsive force between the movable contactor 4 and the fixed contactor 1 when a large accident current flows. This action causes the movable contactor 4 to be rotated separately from the fixed contactor 1 without waiting for the operation of the trip device 5, so that the accident current is quickly interrupted. In this case, the current contact speed is increased by increasing the separation speed of the movable contactor 4, and conventionally, the U-shaped magnetic driving iron core 7 as shown in FIG. , 4) was installed in a state of being sandwiched from the side. In Fig. 6, reference numeral 8 denotes a position away from the magnetic core 7 for space in the case 2 in order to eliminate arcs generated when the movable contact 6 is separated from the fixed contact 3. It is installed grid plate.

In this configuration, however, the separation speed of the movable contactor 4 depends on the difference in the magnetic flux density of the upper and lower spaces of the movable contactor 4, and the larger the difference in the magnetic flux density is, the larger the separation speed becomes. However, in the above description, since the upper portion of the magnetic driving iron core 7 is in an open state, the space between the upper side portions 7a constitutes a part of the magnetic circuit. As a result, the magnetic flux density of the upper space of the movable contactor 4 does not become small enough, and as a result, the difference in magnetic flux density of the upper and lower spaces of the movable contactor 4 becomes small, so that the separation speed of the movable contactor 4 cannot be sufficiently increased.

Thus, since the magnetic flux density of the upper space of the movable contactor 4 is reduced as much as possible, the upper structure of the upper portions of the side portions 7a of the magnetic core 7 for driving is connected by the connecting portion 7b as shown in FIG. An attempt was made to use a self-driving iron core (7). According to this, the magnetic flux in the upper portion of the movable contactor 4 concentrates on the connecting portion 7b in the upper portion of the magnetic driving iron core 7, so that the magnetic flux density of the upper space of the movable contactor 4 is drastically lowered. The separation speed of 4) can be sufficiently increased. On the other hand, in this configuration, however, since the upper portion of the magnetic driving iron core 7 is connected by the connecting portion 7b, the connecting portion 7b of the magnetic driving iron core 7 at the time of assembly of the circuit breaker prevents the assembly. This results in the drawback that the manufacturability is lowered.

In the conventional configuration using the U-shaped driving core 7 as described above, the separation speed of the movable contactor 4 is not sufficient. There was a problem that the sex is greatly reduced.

Therefore, it is an object of the present invention to provide a circuit breaker which increases the disconnection speed of the movable contact in the event of an accident and enables rapid current interruption and yet does not impair assembly.

In the present invention, when the movable contact supported by the rotatable contact with the movable contactor is in contact with the fixed contactor and the movable contactor having a conductor portion substantially parallel to the movable contactor, the contactor extends in the separation direction and is disposed on both sides of the movable contactor. An insulating layer formed on the surface of the magnetic driving iron core and a side circuit of the magnetic driving iron core in a circuit breaker having a pair of side portions having a magnetic drive iron core formed in a substantially U shape and a grid plate for extinguishing separation of the movable contactor. A grid plate provided to hold a small magnetoresistance at least at the top of the section was provided.

When an accident current flows in the main circuit, magnetic flux is distributed around the movable contactor and the fixed contactor, and the electromagnetic repulsive force acts between the movable contactor and the fixed contactor. At this time, the magnetic flux in the upper portion of the movable contactor is concentrated on the grid plate connected by the magnetic driving iron core and the small magnetoresistance, so the magnetic flux density of the upper space of the movable contactor is extremely lowered. As a result, the difference in magnetic flux density in the upper and lower spaces of the movable contactor is greatly increased, so that the repulsive force of the movable contactor is faster than the conventional one. In addition, since the upper portion of the magnetic core for driving is open, the magnetic core for driving the circuit breaker does not interfere with the assembly.

A first embodiment of the present invention will be described below with reference to FIGS. 11 is a fixed contact fixed to the case 12, one end of which is connected to the main circuit outside the case 12 and a fixed contact 13 is provided at the other end which is bent. 14 is a movable contact, which extends in parallel with the fixed contact 11 from within the trip device 15 so that the movable contact 16 provided at this tip contacts the fixed contact 13 of the fixed contact 11. , Detachable. When the accident current flows in the main circuit, the movable contact 14 is pulled up from the closed position to the open and disengaged direction by the trip device 15 to be displaced to the open position. Although not shown, the proximal end of the movable contactor 14 is rotatably provided on the tripper 15 side, and when an accident current flows, the fixed contactor (by the electromagnetic repulsive force) does not wait for the opening and detaching operation by the tripper15. It is to separate rotation from 11). By the way, 17 is a U-shaped magnetic drive iron core, which is equipped with a pair of side portions 17a so as to sandwich both contactors 11 and 14 therebetween, and the pair of side portions 17a and 17a are movable. The contact 14 extends in the contacting and separating direction.

An insulating layer (not shown) is formed on the surface of the magnetic drive iron core 17 by flow coating such as epoxy resin. 18 is a number of extinguished gripping plates, which have U-shaped openings 18a for passing arcs generated at the time of opening and detaching of the movable contact 14, and both open ends of the U-shaped openings 18a. A pair of cutouts 18b are formed in the grooves. As shown in FIG. 1, these grid plates 18 are arranged and disposed close to the side portions 17a of the magnetic driving iron core 17 in the cutout portions 18b, and the spacing thereof is about. It is less than 2mm. In this case, the magnetic driving iron core 17 and the grid plate 18 are electrically insulated, but are magnetically connected with a small magnetoresistance.

Next, the operation of the above configuration will be described. For example, if a short circuit accident occurs and a short-circuit current flows to the movable contactor 14 and the fixed contactor 11 in opposite directions, for example, indicated by arrows in FIG. 2, the movable contactor 14 and the fixed contactor ( 11) The magnetic flux in the direction shown in FIG. The magnetic flux generated by the current flowing through the movable contactor 14 is concentrated on the magnetic driving iron core 17 on both sides of the movable contactor 14, and on the upper side of the movable contactor 14, as shown by the arrow shown in FIG. 1. It concentrates on the grid plate 18 which is almost in contact with the driving iron core 17. Therefore, the upper spatial magnetic flux density of the movable contactor 14 is sufficiently small, and as a result, the difference in magnetic flux density in the upper and lower spaces of the movable contactor 14 becomes large, so that the movable contactor 14 receives a large electromagnetic-based force and quickly fixes the fixed contactor ( 11). As a result, the arc generated between the movable contact 14 and the fixed contact 11 is rapidly cut off due to the long arc length, so that the accident current is quickly interrupted without waiting for the completion of the blocking by the trip device 15.

Moreover, since it is not necessary to connect the opening of the upper part of the self-driven iron core 17, this self-driven iron core 17 does not interfere with assembly at the time of assembling the circuit breaker using this self-driven iron core 17. .

4 shows the main part of the second embodiment of the present invention, and the difference from the first embodiment is that the connecting portion 21 bypasses the opening portion at the upper end of the side portion 17a of the U-shaped magnetic driving iron core 17. It is provided so that it may be integrally provided, and this connection part 21 may be used as a part of the grid board 18 group.

In addition, the magnetic core 17 and the connecting portion 21 for forming the insulating layer on the entire surface by flow coating is the same as in the first embodiment. In the case where the magnetic driving iron core 17 is used, the opening of the upper portion of the side portion 17a of the magnetic driving iron core 17 is connected by bypassing by the connecting portion 21, so that the magnetic driving force is compared with that of the first embodiment. The magnetoresistance between the iron core 17 and the connecting portion 21 is further smaller, which makes it possible to further increase the difference in magnetic flux density in the vertical space of the movable contactor 14 and further increase the separation speed of the movable contactor. Can be. In this case, since the magnetic resistance of the magnetic path through the connecting portion 21 becomes extremely small, the grid plates 18 may be positioned farther from the magnetic driving iron core 17 than in the case of the first embodiment.

In addition, in the present invention, as shown in FIG. 5, the fixed contactor 22 is rotatably installed, and the fixed contactor 22 also moves to the side opposite to the contact and disconnection direction of the movable contactor 14 by the electromagnetic repulsive force due to the accidental current. It may be rotated.

Others The present invention can be embodied in various ways within the scope not departing from the gist of the invention as described above and not limited to those described in the drawings.

As apparent from the above description, the magnetic flux density in the upper space of the movable contactor is increased because the grid plate for extinguishing the magnetic contacting iron core provided in accordance with the contact and separation direction of the movable contactor is provided with a small magnetic resistance. It becomes small enough, and the difference of the magnetic flux density of the upper and lower spaces of a movable contact becomes large enough compared with the conventional thing. As a result, the speed at which the movable contactor is separated is greatly improved, and thus an excellent current / blocking effect can be obtained.

Claims (2)

A movable contactor 14 rotatably supported, a fixed contactor 11 and 22 having a conductor portion substantially parallel to the movable contactor 14 when the movable contactor 14 is in contact with the movable contactor 14, and the movable contactor 14 Of the magnetically driven iron core 17 and the movable contactor 14 extending in the contact and separation directions of the magnetic contactor and having a pair of side edge portions 17a disposed on both sides of the movable contactor 14 and being substantially U-shaped. In a circuit breaker having an arc extinguishing grid plate 18 at the time of opening and dismounting, an insulating layer formed on the surface of the self-driving iron core 17 and at least an upper side of the side portion 17a of the self-driving iron core. A circuit breaker, characterized in that the grid plate (18) is provided to hold a small magnetoresistance. 2. The magnetic drive iron core 17 according to claim 1, characterized in that it has a connecting portion 21 that magnetically connects the both side portions 17a by bypassing an open portion formed between both side portions 17a thereon. Circuit breaker.

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