KR101072976B1 - Earth leakage breaker capable of instantaneous interruption of large currents - Google Patents

Abstract

The present invention relates to an earth leakage circuit breaker capable of instantaneous interruption when a large current is introduced. The trip device of the earth leakage breaker includes: a trip bar connected to the crossbar and interlocked with the crossbar; It is composed of a magnetic body having a first surface, a second surface, and a third surface connected to each other sequentially, the first surface is disposed to be spaced apart from the bimetal in a position opposite to the bimetal, the third surface is fixed to the body of the trip bar The second surface includes an armature connecting the first surface and the third surface. In the ground fault apparatus, a bimetal is disposed between the trip bar and the first surface of the armature, and the trip bar also rotates as the armature fixed to the trip bar moves.
The circuit breaker according to the present invention, when a large current of about 2.5kA or more is introduced, the armature is instantly magnetized by the bimetal magnetic field and quickly attracted to the bimetal. And moving contacts are disconnected, which quickly interrupts the flow of current.

Description

Leakage breaker for preventing from flowing high current}

The present invention relates to an earth leakage circuit breaker, and more particularly, to an earth leakage circuit breaker capable of instantaneous interruption when a large current of about 2.5 kA or more is introduced.

The earth leakage breaker is a safety device that can prevent the risk of electric shock due to the earth leakage, and it cuts off the electricity within 0.03 seconds even if a minute leakage occurs about 30mA indoors. Such an earth leakage breaker or circuit breaker automatically cuts off the circuit in an overload or short circuit condition, where an overload causes an excessive current caused by a short circuit, an excessive flow of current due to excessive use of a device or a machine, and a lightning or surge ) Means overcurrent.

On the other hand, when the current applied to the earth leakage breaker is instantaneously applied at a constant magnification of the rated current, the earth leakage breaker automatically cuts off the current regardless of artificial opening and closing. This is referred to as a 'trip'. It is called 'trip current'.

1 is a perspective view showing the structure of a conventional earth leakage breaker as a whole, Figure 2 is a perspective view showing a trip device in the earth leakage breaker of FIG.

1 and 2, the conventional circuit breaker 10 includes a fixed contactor 120 having one end connected to a load, and a movable contact 110 rotatable to a position in which the other end of the fixed contactor is in contact with or separated from the other end of the fixed contactor. ), The crossbar 130 for opening and closing the circuit by moving the movable contactor so that the fixed contactor and the movable contactor is in contact or separated, the handle 140 connected to the crossbar to manually open and close the circuit from the outside, fixed installation in the main circuit And a bimetal 150 that causes thermal deformation when an abnormal current such as an overcurrent or a short circuit occurs, and a trip bar 160 that detects an overcurrent or a short circuit in the power supply and moves the handle to induce a trip. The trip bar 160 is spaced apart from the bimetal by a predetermined distance to face each other, and is rotated by the thermal deformation of the bimetal. The trip bar is interlocked with the crossbar, and when the trip bar is rotated, the crossbar interlocked with the trip bar is also rotated together, so that the movable contactor and the fixed contactor are separated from each other, and the circuit is blocked to block the current flow. When the overcurrent flows to the earth leakage breaker, the bimetal is thermally deformed due to the overcurrent and is bent toward the trip bar.The bent bimetal causes the trip bar to rotate, and the cross bar linked with the trip bar also rotates together to fix the fixed contactor and the movable contactor. The circuit breaks as it is disconnected.

In the tripping device of the conventional ground fault circuit breaker having the above-described structure, the circuit is opened and closed by the thermal deformation of the bimetal due to the overcurrent generation. In this case, there is a problem that a delay time of several tens of msec is required until the trip bar rotates due to thermal deformation of the bimetal. However, when a large current of 2.5kA or more is suddenly introduced due to lightning, etc., a circuit breaker burns or breaks down even in a delay time of several tens of msec.

In order to solve the above-mentioned problems, "trip circuit breaker trip device" of Korean Utility Model Registration No. 20-443585 discloses a trip guide member. The trip guide member of the above-described registered utility model moves in the direction in which the bimetal is located when an abnormal current is generated, thereby increasing the rotational force of the trip bar to enable a quick trip. The above-described trip bar of the utility model is provided with a vertical portion having a predetermined length, an extension portion bent and extended at the vertical portion, and a coupling portion bent at the extension portion, and coupling the trip guide member to the coupling portion. It is characterized by. However, the above-described registration utility model has a problem in that the overall structure is complicated by modifying the structure of the trip bar of the conventional earth leakage breaker and combining the trip guide member with the modified trip bar. In addition, since the trip bar of the conventional earth leakage breaker cannot be used as it is, it is troublesome to manufacture parts again.

An object of the present invention for solving the above problems is to provide an earth leakage circuit breaker that can be cut off quickly even if a sudden large current is introduced.

Another object of the present invention is to provide an earth leakage circuit breaker that can be quickly cut off even when a large current is introduced while maintaining the structure of a trip bar of a conventional earth leakage circuit breaker.

A feature of the present invention for achieving the above-described technical problem relates to an earth leakage circuit breaker having a fixed contactor, a movable contactor, a crossbar, a bimetal and a trip device to quickly detect a large current to induce a current interruption. A trip bar connected to the crossbar and interlocked with the crossbar; It is made of a magnetic body having a first surface, a second surface, and a third surface connected to each other sequentially, the first surface is disposed to be spaced apart from the bimetal in a position opposite to the bimetal, the third surface is on the body of the trip bar It is fixed, the second surface; and the armature connecting the first surface and the third surface; having a bimetal is disposed between the trip bar and the first surface of the armature, the trip bar is also accompanied by the armature fixed to the trip bar Rotate

In the ground fault circuit breaker according to the above features, it is preferable that the third surface of the armature is fixed by bolting to the body of the trip bar.

In the earth leakage circuit breaker according to the above features, it is further provided with a fixing plate fixed to the side of the bimetal, the fixing plate is preferably made of a magnetic material.

In the ground fault circuit breaker according to the above-mentioned feature, the area in contact with the trip bar of the second surface of the armature is preferably configured to have a larger area than the area not in contact with the trip bar.

According to the present invention, when a large current is suddenly introduced into the earth leakage breaker, a large current flows through the bimetal, and a magnetic field is formed around the bimetal by the large current, and an armature arranged to face the bimetal by the magnetic field is instantaneously magnetized and bimetallic. You will be quickly dragged to Bimetal. As the armature moves, the tripbar fixedly connected to the armature rotates together, and the crossbar connected to the tripbar also moves together, and as a result, the movable contactor and the fixed contactor are separated, thereby blocking the flow of current.

According to the present invention, when a large current flows suddenly into the earth leakage breaker, the trip bar is rotated by the movement of the armature instead of the trip bar being rotated by the thermal deformation of the bimetal. Accordingly, since the delay time due to the thermal deformation of the bimetal is not required, the trip bar is rotated at the same time as the large current is introduced without the delay time, thereby quickly blocking the flow of the large current to the load.

The circuit breaker according to the present invention maintains the conventional circuit breaker and trip bar as it is, and by adding only the armature of the magnetic body, it is possible to implement the instantaneous interruption at the time of large current inflow. Therefore, according to the present invention, it is possible to implement an instantaneous interruption against a large current without changing the structure of a conventional earth leakage breaker.

1 is a perspective view showing the structure of a conventional earth leakage breaker as a whole, Figure 2 is a perspective view showing a trip device in the earth leakage breaker of FIG.
3 is a perspective view showing an overall structure of an earth leakage breaker according to an exemplary embodiment of the present invention, and FIG. 4 is an enlarged perspective view of a trip device of the earth leakage breaker of FIG. 3.
Figure 5 (a) is a perspective view showing only the trip device of the earth leakage breaker according to a preferred embodiment of the present invention, Figure 5 (b) is an exploded perspective view of the trip device of (a).
6 is a front view illustrating the operation of the ground fault circuit breaker according to a preferred embodiment of the present invention. It is a front view which shows the state in which the bar was rotated.

Hereinafter, with reference to the accompanying drawings will be described in detail the structure and operation of the circuit breaker capable of instantaneous interruption of a large current according to an embodiment of the present invention.

3 is a perspective view showing an overall structure of an earth leakage breaker according to an exemplary embodiment of the present invention, and FIG. 4 is an enlarged perspective view of a trip device of the earth leakage breaker of FIG. 3. Figure 5 (a) is a perspective view showing only the trip device of the earth leakage breaker according to a preferred embodiment of the present invention, Figure 5 (b) is an exploded perspective view of the trip device of (a).

3 to 5, the earth leakage breaker 30 according to the preferred embodiment of the present invention includes a fixed contact 320, a moving contact 310, a cross bar 330, a handle, and a handle. 340, a bimetal 350, a fixed plate 370, and a trip device 360 are provided to quickly detect an overcurrent to induce a current interruption. Except for the trip device 360 and the fixed plate 370 of the earth leakage breaker 30 according to the present invention is the same as the configuration of the conventional earth leakage breaker described above, overlapping description is omitted and corresponds to the gist of the present invention. Only the tripping device and the fixed plate to be described will be described.

The trip device 360 of the earth leakage breaker 30 according to the preferred embodiment of the present invention includes a trip bar 362 and an armature 364 connected to the crossbar and interlocked with the crossbar, and the armature is a trip. It is fixed to the body of the bar using the bolt (366).

Bimetal is made by superimposing two kinds of thin metals having different coefficients of expansion and contraction according to a change in temperature, that is, they expand or contract in one direction according to the change of temperature.

The armature 364 includes a first surface (a), a second surface (b), a third surface (c) sequentially connected to each other and is made entirely of a magnetic material. The first surface (a) is disposed to be spaced apart from the bimetal at a position opposite to the bimetal, the third surface (b) is fixed to the body of the trip bar, the second surface (c) is the first surface and the third surface Connect The bimetal is arranged between the trip bar and the first surface of the armature, and since the armature is fixed to the trip bar, the armature and the trip bar move together. The third surface of the armature is bolted to the body of the trip bar and fixed to the trip bar. The area in contact with the trip bar of the second surface of the armature is configured to have a larger area than the area not in contact with the trip bar, so that the armature is stably fixed to the trip bar.

The fixing plate 370 is made of a magnetic material is fixed to the side of the bimetal. When a current flows into the bimetal, a magnetic field is formed between the bimetal and the fixed plate. The magnetic field thus formed further increases the magnetic field formed between the armature and the bimetal, and as a result, the force for moving the armature is further increased.

Hereinafter, the operation of the earth leakage breaker according to the present invention having the above-described configuration will be described with reference to FIG. 6. 6 is a front view illustrating the operation of the ground fault circuit breaker according to a preferred embodiment of the present invention, (a) is a front view showing a normal state, (b) is a large current flows in trip by the armature movement It is a front view which shows the state in which the bar was rotated.

Referring to (a) of FIG. 6, in a normal state in which a large current is not introduced, the bimetal and the armature are kept at a predetermined distance, and the movable contactor and the fixed contactor are in contact with each other.

Referring to FIG. 6B, when a large current flows into the bimetal, a magnetic field is formed around the bimetal, and the amateurs facing each other at a predetermined distance from the bimetal are magnetized instantaneously by the magnetic field, and the magnetized amateur is bimetallic. You will be dragged away in no time. At this time, the armature and the bolted trip bar are also moved together, the crossbar is moved by the movement of the trip bar, and the movable contact is separated from the fixed contact to block the flow of current.

On the other hand, when a large current flows into the bimetal, a magnetic field is further formed around the bimetal by the fixing plate 350 of the magnetic material fixed to the side of the bimetal. The magnetic field additionally formed by the stationary plate further increases the magnetic field formed between the armature and the bimetal to further increase the moving force of the armature, thereby increasing the speed at which the armature is attracted to the bimetal.

Therefore, when a large current flows into the earth leakage breaker according to the present invention, as the armature moves at a high speed, the trip bar is also rotated to cut off the current flow quickly.

Although the present invention has been described above with reference to preferred embodiments thereof, this is merely an example and is not intended to limit the present invention, and those skilled in the art do not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications which are not illustrated above in the scope are possible. And differences relating to such modifications and applications should be construed as being included in the scope of the invention as defined in the appended claims.

The earth leakage breaker according to the present invention can be instantaneously interrupted even when a large current of 2.5 kA or more is suddenly introduced by lightning, lightning, etc., and thus can be widely used in industrial sites and the like where a large current is likely to flow.

10, 30: earth leakage breaker
110, 310: Movable Contact
120, 320: fixed contact
130, 330: crossbar
140,340: Handle
150, 350: bimetal
160, 362: Tripbar
360: trip device
364: Amateur
366: Bolt
370: fixed plate

Claims (4)

In an earth leakage circuit breaker having a fixed contactor, a movable contactor, a crossbar, a bimetal, and a trip device for quickly detecting an overcurrent and inducing a current interruption, the trip device includes:
A trip bar connected to the crossbar and interlocked with the crossbar;
It is made of a magnetic body having a first surface, a second surface, and a third surface connected to each other sequentially, the first surface is disposed to be spaced apart from the bimetal in a position opposite to the bimetal, the third surface is on the body of the trip bar A second side, the armature connecting the first side and the third side;
And a bimetal is disposed between the trip bar and the first surface of the armature, and the armature is fixed to the trip bar and the trip bar rotates together as the armature moves. The earth leakage breaker of claim 1, wherein the third surface of the armature is fixed by bolting to a body of the trip bar. The earth leakage circuit breaker of claim 1, further comprising a fixing plate fixed to a side of the earth leakage circuit breaker bimetal, wherein the fixing plate is made of a magnetic material. The earth leakage circuit breaker of claim 1, wherein an area of the second surface of the armature that is in contact with the trip bar is configured to have a larger area than an area that is not in contact with the trip bar.

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