KR100323739B1 - ciruit trip device with function for controlling trip time in MCCB - Google Patents

Abstract

The present invention relates to an instantaneous adjustable trip device for adjusting an instantaneous breaking current value of a circuit breaker, which is an electric device that detects an abnormal current caused by an overload or a short circuit on an electric line and cuts off a circuit. By adjusting the instantaneous interruption current value, the moving core moves linearly, and the distance from the fixed core is changed so that the setting current value can be adjusted accurately.

The present invention provides a coil through which a current passes, a fixed core in which a magnetic force is generated when an abnormal current flows in the coil, a movable core sucked in the fixed core by linear movement when a magnetic force is generated in the fixed core, and the movable core. A circuit breaker having an instant bar connected to the linear bar to move the movable core, a cross bar connected to the instant bar to rotate the instant bar, and an adjustment dial for moving the cross bar to vary the distance between the movable core and the fixed core. Instantaneous adjustable trip device.

Description

Instantaneous adjustable trip device of circuit breaker {ciruit trip device with function for controlling trip time in MCCB}

The present invention relates to a circuit circuit breaker for wiring, which is an electrical device that protects a circuit and a load by automatically detecting a circuit when an abnormal current occurs due to an overload or a short circuit on an electric line. An instantaneous adjustable trip device for a user to adjust an instantaneous breaking current value in a trip part that detects an instantaneous current and trips a mechanism part.

In general, wiring breakers are divided into terminal parts connecting the power supply side and the load side, a mechanism part that opens and closes the contact between the stator and the mover, and detects when an abnormal current such as overcurrent, instantaneous current, or short-circuit current occurs on the power supply side. It consists of a trip part which induces a trip so that a power supply may be cut off by operating a mechanism part.

In addition, such a circuit breaker detects this in the breaker and automatically cuts off the current regardless of the artificial opening and closing of the breaker when an abnormal current is generated. This is called a normal trip. Means that the current applied to the circuit breaker is momentarily applied at a certain magnification of the rated current and trips at a suitable time for a certain magnification. This function is called instantaneous trip function.

1 is an overall configuration diagram showing an example of a conventional circuit breaker, wherein the circuit breaker includes a base 1 and a cover 2 for accommodating parts, an opening and closing mechanism 3 for mechanically opening and closing a converter, and an abnormality. It consists of a trip part 4 which detects this when a current or an accident current is generated, and makes the mechanism part operate, and a extinguishing part 5 which extinguishes the arc generated between the contacts during the breaking operation.

FIG. 2 is a block diagram illustrating a trip part, wherein the trip part includes a coil 11 through which a current passes, a fixed core 12 generating magnetic force when an abnormal current flows through the coil, and a magnetic force generated on the fixed core. Amateur 13, which is sucked toward the fixed core side while rotating about the pin 14, Instant Bar 15 moving together with the Amateur, and tension that exerts a reaction force on the rotational force of the Amateur. A spring 18, an adjustment dial 17 connected to one end of the instant bar and moving the instant bar to adjust a gap between the armature and the fixed core, and an opening / closing mechanism in association with the rotation operation of the armature. Cross bar (16) that serves to trip the (Cross Bar) and the latch holder (19) for restraining or releasing the latch (Latch) of the opening and closing mechanism portion while operating in conjunction with the cross bar Consists of.

Therefore, when an abnormal current such as overcurrent, instantaneous current, or short circuit current flows in the coil 11 in the trip part, a magnetic force is generated in the fixed core 12 to attract the armature 13, and the armature 13 is a pin ( It is attracted to the fixed core 12 while rotating about 14).

At this time, when a magnetic force greater than the tension of the tension spring 18 connected between the armature 13 and the instant bar 15 is generated in the fixed core 12, the armature 13 is centered around the pin 14. While rotating, the distal end portion 13a strikes the crossbar 16. At this time, the latch holder 19 of the opening / closing mechanism part is released by the impact received by the crossbar 16, and the latch is released. Is done.

When the user wants to adjust the instantaneous current value (trip current value) in the circuit breaker as described above, the adjustment is made by turning the adjusting dial 17, which will be described with reference to FIG. 3.

3A is a state diagram in which the instantaneous current value is set to the minimum, and the smallest diameter portion of the spiral cam portion 17a integrally formed on the adjusting dial 17 is connected to the upper surface 15a of the instant bar 15 in the drawing. The gap GAP1 between the armature 13 and the fixed core 12 is minimized. In this state, even though a small instantaneous current flows, the instantaneous current is sucked by the armature 13 and the fixed core 12. The value is minimum.

When the adjusting dial 17 is rotated in the maximum direction in the above state, the instant bar 15 gradually connects with the large diameter portion of the helical cam portion 17a, whereby the instant bar 15 is connected to the pin 14. It rotates in the clockwise direction to the center, and the armature 13 also rotates like the instant bar 15 to maximize the gap (GAP2) between the armature 13 and the fixed core 12 at the same time. The instantaneous current value also becomes maximum.

That is, the trip current value is set by rotating the adjustment dial 17 to adjust the distance between the armature 13 and the fixed core 12.

However, the conventional apparatus as described above simply uses the armature 13 because the armature 13 does not move linearly but rotates about the pin 14 when adjusting the trip current value by turning the adjusting dial 17. It is very difficult to adjust the magnification of the trip current value only by adjusting the interval between the fixed core 120 and the fixed core 120, and therefore, it is difficult to specify the trip current value of a constant magnification between the minimum and maximum range of the adjustment dial 17.

In addition, since the conventional device is difficult to maintain a constant magnetic force according to each rating (1.6A ~ 80A), it was necessary to manage and replace the springs of various commutation for the instantaneous trip characteristics of each rating and accordingly It led to an increase in the number of adjustments and adjustments.

Disclosure of Invention An object of the present invention is to provide an instantaneous adjustable trip device of a circuit breaker that can accurately adjust a trip current value by a linear motion of a movable core, unlike a conventional device that adjusts a trip current value by an armature rotation. will be.

According to an embodiment of the present invention for achieving the above object, a fixed core that generates a magnetic force when an abnormal current flows through the coil, and fixed while moving linearly when the magnetic force is generated in the fixed core A movable core attracted by the core, an instant bar connected to the movable core to linearly move the movable core, a crossbar connected to the instant bar to rotate the instant bar while moving, and a distance between the movable core and the fixed core by moving the crossbar Provided is an instantaneous adjustable trip device for a circuit breaker having an adjustment dial for varying the speed of the circuit.

1 is an overall configuration diagram showing an example of a conventional circuit breaker

2 is a block diagram of a conventional circuit breaker

Figure 3a is a state in which the adjustment dial is adjusted to the minimum in the conventional trip part

Figure 3b is a state in which the adjustment dial is adjusted to the maximum in the conventional trip part

Figure 4 is an overall configuration diagram of a circuit breaker to which the present invention is applied

Figure 5 is a perspective view of the device of the present invention

6 is a front view showing the device of the present invention;

7A is a plan view and a front view of a trip part showing a state in which the adjustment dial is adjusted to the minimum in the device of the present invention;

7B is a plan view and a front view of a trip part showing a state in which the adjustment dial is adjusted to the maximum in the device of the present invention;

8 is a perspective view of an adjustment dial;

Explanation of symbols for main parts of drawings

21: coil 22: fixed core

23: movable core 24: instant bar

24a: connection protrusion 26: crossbar

26a: rack 26b: slope

27: adjustment dial 27a: pinion

4 is a schematic diagram of a circuit breaker according to the present invention, which includes a base 1 and a cover 2 for accommodating parts, an opening and closing mechanism 3 for mechanically opening and closing a converter, and an abnormal current or an accident current. The basic structure of the trip part 4 which detects this when it occurs and makes the mechanism part operate, and the extinguishing part 5 which extinguishes the arc which generate | occur | produces between contacts in the interruption | operation operation is the same as a general circuit breaker.

The trip unit 20 includes a coil 21 through which a current passes through as shown in FIGS. 5 and 6, a fixed core 22 generating magnetic force when an abnormal current flows through the coil, and the fixed core. A movable core 23 attracted to the fixed core side when a magnetic force is generated, an instant bar 24 for controlling the movement of the movable core, a crossbar 26 connected to the instant bar to rotate the instant bar, and the crossbar And an adjustment dial 27 for rotating the instant bar by moving the, and a shooter 28 for hitting the latch holder to block the converter during trip operation.

The movable core 23 is installed in a straight line above the fixed core 22 and is connected to one side of the instant bar 24 that rotates about the pin 25 to rotate the instant bar 24. It moves up and down vertically according to the operation.

As shown in FIG. 8, the pinion 27a is integrally formed on the adjusting dial 27, and the rack 26a is formed on the crossbar 26 to be engaged with the pinion 27a.

Therefore, when the adjustment dial 27 is rotated, the rotational movement thereof is changed into a linear motion, and the crossbar 26 moves forward or backward in accordance with the rotation direction of the adjustment dial 27.

Incidentally, the inclined surface 26b is formed on the crossbar 26, and the connection bar 24a for connecting with the inclined surface 26b is integrally formed on the instant bar 24.

Therefore, when the crossbar 26 is moved by the rotation of the adjusting dial 27, the connecting protrusion 24a connected to the inclined surface 26b moves from the high place to the low place of the inclined surface 26b according to the moving direction of the crossbar 26. Alternatively, the connection position is changed from a low position to a high position, and the instant bar 24 rotates around the pin 25 according to the connection position of the connection protrusion 24a and the inclined surface 26b as described above. By the rotational movement of the instant bar 24, the movable core 23 connected to one side of the instant bar 24 moves up and down.

The operation of the present invention as described above will be described.

FIG. 7A is a plan view and a front view of a trip part showing a state in which the adjusting dial 27 is adjusted to the minimum, and the connecting protrusion 24a of the instant bar 24 is located at the lowest position among the inclined surfaces 26b of the crossbar 26. The gap GAP1 between the movable core 23 and the fixed core 22 is kept in a minimum state.

At this time, the instantaneous current value is minimum.

When the adjusting dial 27 is rotated in the maximum direction in the above state, the pinion 27a formed on the adjusting dial 27 rotates and the crossbar 26 where the rack 26a is engaged with the pinion 27a is When the linear bar is moved and the crossbar 26 moves linearly, the high part of the inclined surface 26b is connected to the connecting protrusion 24a. Thus, the instant bar 24 is shown in FIG. It will rotate counterclockwise.

Therefore, the movable core 23 connected to one side of the instant bar 24 ascends as the instant bar 24 rotates, so that the gap GAP2 between the movable core 23 and the fixed core 22 is maximized.

The present invention, unlike the conventional device that adjusts the instantaneous breaking current value by the change of the distance between the fixed core and the armature according to the rotation of the armature, the movable core 23 and the movable core 23 by the linear movement Since the interval between the cores 23 is changed to adjust the instantaneous breaking current value, the gap GAP between the fixed core 22 and the movable core 23 is fixed only by a change in the distance of the movable core 23. The magnetic force generated between the gaps can be constantly adjusted by adjusting the upper and lower distances of the movable core 23.

Therefore, it is possible to set a certain number of times according to the rated current of the adjusting dial 27, so that the instantaneous trip device operates at the correct setting current value, thereby improving the operation reliability of the breaker and unifying the tension springs required for each rating. Can be easily managed.

Claims (3)

A coil 21 through which a current passes, a fixed core 22 which generates a magnetic force when an abnormal current flows in the coil, and a movable core sucked by the fixed core while linearly moving when a magnetic force is generated in the fixed core ( 23), an instant bar 24 connected to the movable core to linearly move the movable core, a crossbar 26 connected to the instant bar to rotate the instant bar while moving, and a movable core and a fixed core by moving the crossbar. Instantaneous adjustable trip device of a circuit breaker, characterized in that consisting of a control dial 27 for varying the interval between. 2. The instant bar 24 according to claim 1, wherein an inclined surface 26b is formed on the crossbar 26, and an instant bar 24 is formed with a connecting protrusion 24a for connecting to the inclined surface. The instantaneous adjustable trip device of the circuit breaker characterized by the above-mentioned. 2. The crossbar (26) according to claim 1, wherein the pinion (27a) is formed on the adjusting dial (27) and the rack (26a) is engaged on the crossbar (26) to engage the pinion. The instantaneous adjustable trip device of the circuit breaker characterized by the linear movement.