KR100390459B1 - circuit trip device with function for controlling trip time in MCCB - Google Patents

Abstract

The present invention relates to an instantaneous temporarily adjustable trip device for a circuit breaker, and to detect an abnormal current caused by an overload or a short circuit on an electric line and to adjust an instantaneous breaking current value of a circuit breaker that is an electrical device that cuts off a circuit. The instantaneous adjustable trip device is designed to adjust the instantaneous cutoff current value by adjusting the dial to move the moving core in a straight line and to change the distance from the fixed core.

To this end, the present invention, the coil 21 for passing the current, the fixed core 22 is a magnetic force is generated when an abnormal current flows in the coil, and the fixed core while moving linearly when the magnetic force is generated in the fixed core A movable core 23 sucked by the 22, an instant bar 24 connected to the movable core to linearly move the movable core 23, and a instant bar 24 rotated while being connected to the instant bar and moving. Comprising a cross bar 26 and an adjustment dial 27 for moving the cross bar to vary the distance between the movable core 23 and the fixed core 22, the periphery of the movable core 23 in the coil 21 The upper core 29 is fixed to the portion to reinforce the magnetic force generated from the fixed core 22 and the torsion spring 30 is installed at one end of the cross bar 26 to add a restoring force when the cross bar is rotated. And work of instant bar (24) Characterized in that installed on the hayeoseo further comprising a tension spring (31) to bar the instant the additional restoring force during pivoting.

Description

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

The present invention relates to a circuit circuit breaker for wiring, which is an electric 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.

First, the present invention is an improved invention of patent 99-049246 (filed date; 1999.11.08) filed by the applicant of the present invention.

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 circuit breaker for a conventional wiring. The circuit breaker includes a base 1 and a cover 2 for accommodating parts, an opening and closing mechanism part 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 opening / closing 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. Armature 13 which is attracted to the fixed core side while rotating about pin 14, Instant bar 15 moving with the armature, and tension spring 18 that exerts a reaction force on the rotational force of the armature. ), An adjustment dial 17 for connecting the one end of the instant bar and moving the instant bar to adjust the gap between the armature and the fixed core, and a function of tripping the opening / closing mechanism in connection with the rotation operation of the armature. Cross bar (16), and a 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. It is configured.

Therefore, when an abnormal current such as overcurrent, instantaneous current or short circuit current flows through 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 has a pin 14. It is attracted to the fixed core 12 while rotating about.

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 occurs in the fixed core 12, the armature 13 is centered around the pin 14. While rotating, the distal end portion 13a strikes the cross bar 16. At this time, the latch holder 19 of the opening / closing mechanism part is released by the impact of the cross bar 16, thereby releasing the latch and simultaneously opening and closing the contact. The operation is made.

When the user wants to adjust the instantaneous breaking 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 breaking 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 the upper surface 15a of the instant bar 15 in the drawing. And 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 breaking current is drawn 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 spiral cam portion 17a, whereby the instant bar 15 is connected to the pin 14. It rotates clockwise around the drawing, and the armature 13 also rotates like the instant bar 15 so that the gap G2 between the armature 13 and the fixed core 12 is at the same time and instantaneously. The breaking current value is also 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 device as described above is simply fixed with 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 cores 12, 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, the conventional device is difficult to maintain a constant magnetic force according to each rating (1.6A ~ 80A), so it is stored a variety of springs for the instantaneous trip characteristics of each rating and replaced each time the trip current value of the breaker is adjusted It is understood that the number of parts increases accordingly, and the adjustment process becomes more complicated.

On the other hand, the conventional instantaneous adjustable trip device described above adjusts the trip current value according to the method of adjusting the distance between the fixed core by rotating the armature by a certain amount, in this case, the magnetic force in the inclined state as the armature is rotated Since the suction force is increased very irregularly according to the fixed core and the armature spacing, the operator has a problem that it is very difficult to accurately adjust the instantaneous interruption current value.

That is, since it is very difficult to load the accurate instantaneous interruption current value by the conventional method, the problem that the operation reliability of the device is very weak is bound to occur.

In addition, the above-mentioned reason is that the operator has to prepare a separate tension spring for the instantaneous trip characteristic of each rating, and it is troublesome to replace the tension spring every time to meet the trip characteristic when adjusting. In order not to increase the number of parts required, there was a problem that the above adjustment work is very cumbersome from the operator's point of view.

The present invention has been made to solve the above-described problems, to adjust the instantaneous breaking current value of the circuit breaker for the circuit breaker that detects when the abnormal current occurs due to overload or short circuit on the electric line to cut off the circuit. The instantaneous adjustable trip device is designed to adjust the instantaneous cut-off current value by adjusting the adjustment dial so that the instantaneous cut-off current value can be accurately adjusted by changing the distance from the fixed core while the moving core moves linearly. have.

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;

Figure 9a is a graph showing the result of the suction force measurement of the conventional device

9b is a graph showing the result of suction force measurement of the present invention device

<Explanation of symbols for the main parts of the drawings>

21: coil 22: fixed core

23: movable core 24: instant bar

24a: connection protrusion 26: cross bar

26a: rack 26b: slope

27: Adjustment dial 27a: Pinion

According to the present invention for achieving the above object, a coil passing through the current, a fixed core that generates a magnetic force when an abnormal current flows in the coil, and a fixed core while linearly moving when a magnetic force is generated in the fixed core A movable bar being sucked and an instant bar connected to the movable core to linearly move the movable core, a cross bar connected to the instant bar to rotate the instant bar while being moved, and moving the cross bar to vary the distance between the movable core and the fixed core The upper body is fixed to the circumference of the movable core in the coil to reinforce the magnetic force generated from the fixed core, and the torsion is provided at one end of the cross bar to add restoring force when the cross bar rotates. The instant that is installed on one end of the instant bar, with a spring It is the instantaneous rotation when blocked expression of the circuit breaker trip unit, characterized in that the hayeoseo further comprising: a tension spring configured to add a restoring force is provided.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 4 to 9.

Hereinafter, the main configuration of the apparatus according to the present invention will be described in detail.

4, the base 1 and cover 2 for accommodating parts, the opening and closing mechanism part 3 for mechanically opening and closing the converter, and the extinguishing part for extinguishing the arc generated between the contacts during the breaking operation. The basic configuration of (5) is the same as that of a general wiring breaker.

As shown in FIGS. 5 to 7, the trip unit 20 includes a coil 21 through which a current passes, a fixed core 22 generating magnetic force when an abnormal current flows through the coil, and a fixed core 22. A movable core 23 attracted to the fixed core 22 side when a magnetic force is generated, an upper core 29 installed around the movable core in the coil 21 to reinforce the magnetic force generated from the movable core, and An instant bar 24 for controlling the movement of the movable core 23, a cross bar 26 connected to the instant bar to rotate the instant bar 24, and an adjustment dial for moving the cross bar to rotate the instant bar ( 27), a shooter 28 for hitting the latch holder 19 during the trip operation to block the converter, and a restoring force provided at one side of the cross bar 26 to add restoring force to return to the original state when the cross bar is rotated. Torsion Springs (30) And a tension spring 31 provided at one end of the instant bar 24 to add a restoring force so that the instant bar returns to its original state during rotation.

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.

Here, the upper end of the fixed core 22 has a concave concave shape toward the movable core 23, the lower end of the movable core 23 opposed to this corresponds to the concave shape of the fixed core 22 As the tapered upward so that the fixed core 22 wraps around the lower end of the movable core 23, the magnetic core working area of the fixed core 22 and the movable core 23 is sufficiently secured. The operation reliability of the movable core 23 is improved.

As shown in FIG. 8, the pinion 27a is integrally formed on the adjusting dial 27, and the rack 26a is formed on the cross bar 26 so as to be separated from 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 according to the rotation direction of the adjustment dial 27.

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

Therefore, when the cross bar 26 is moved by the rotation of the adjusting dial 27, the connecting projection 24a connected to the inclined surface 26b is located at a high position of the inclined surface 26b according to the moving direction of the cross bar 26. The connection position changes from a low place or a low place to a high place, and the instant bar 24 rotates about the pin 25 in accordance with the variable connection position of the connection protrusion 24a and the inclined surface 26b as described above. The movable core 23 connected to one side of the instant bar 24 by the rotational movement of the instant bar 24 is to move up and down.

Referring to the operation of the present invention as described above, Figure 7a is a plan view and a front view of the trip portion 20 showing a state in which the adjustment dial 27 is adjusted to the minimum, the connection projection 24a of the instant bar 24 Is located at the lowest position among the inclined surfaces 26b of the cross bar 26, and the gap GAP1 between the movable core 23 and the fixed core 22 is kept to a minimum state. Minimum.

When the adjustment dial 27 is rotated in the maximum direction as described above, the pinion 27a formed on the adjustment 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, since the movable core 23 connected to one side of the instant bar 24 is vertically moved upward according to the rotation of the instant bar 24, the gap GAP2 between the movable core 23 and the fixed core 22. Is the maximum.

9A is a graph showing a suction force measurement result of the conventional apparatus, and FIG. 9B is a graph showing a suction force measurement result of the inventive device.

Here, when the trip unit 20 includes only the movable core 23 and the fixed core 22, another problem occurs in that suction force gradients are different from each other according to the change in the number of coil turns as shown in the result graph of FIG. 9A. However, when the operator adjusts the various rated currents (1.6A ~ 100A), there is an inconvenience that must be replaced with another core suitable for the rated current characteristics, because the inclination of the suction force does not coincide with each other.

To this end, the present invention further includes an upper core 29 that reinforces the suction force above the fixed core 22, so that the suction force according to the number of coil turns of the upper core 29 matches each other according to a predetermined ratio as shown in FIG. 9B. The configuration was improved.

That is, simply changing the distance between the fixed core 22 and the movable core 23 does not exactly match the inclination of the suction force according to the change in the number of coil turns, so there is a limit to accurately adjust the trip current value, so reinforce it. In addition to the fixed core 22 in addition to the upper core 29 is further installed to eliminate the difference in the suction force gradient according to the number of coil turns.

As a result, the user can adjust the trip current value accurately without changing the core even if the coil turns at various desired currents, thereby ensuring the operation reliability of the device. There is an advantage that the adjustment work becomes very convenient.

In addition, the torsion spring 30 installed at one end of the cross bar 26 is twisted when the cross bar 26 is rotated to one side by the instant bar 24, so that the cross bar 26 is returned to its original state. The tension spring 31 installed at the bottom of the instant bar 24 serves to add a restoring force to return to the tension bar when the instant bar 24 is rotated to one side by vertical movement of the movable core 23. It is understood that the instant bar 24 is operated to return to its original state because reaction force is generated.

The instantaneous adjustable trip device of the circuit breaker of the present invention is movable with the fixed core by linear movement of the movable core, unlike the conventional apparatus for adjusting the instantaneous breaking current value by changing the distance between the fixed core and the armature according to the rotation of the armature. Since the instantaneous breaking current value is adjusted by changing the gap between the cores, the suction force according to the change of the gap between the fixed core and the movable core can be kept constant.

In addition, since the upper core for reinforcing the magnetic force of the movable core is further installed in the circumferential portion of the movable core in the coil, the suction force slope remains constant even when the coil turns number of the core changes, so that the core must be replaced according to each rated current. Accurate trip current can be adjusted.

Therefore, it is possible to set a certain number of times according to the rated current of the adjusting dial, so that the instantaneous adjustable trip device operates at the correct setting current value, thereby greatly improving the operation reliability of the circuit breaker and reducing the number of parts required. In addition, it is very effective because the trouble of having to replace parts every time when adjusting the instantaneous breaking current value is eliminated.

Claims (2)

A coil penetrating a current, a fixed core in which magnetic force is generated when an abnormal current flows in the coil, a movable core sucked in the fixed core while linearly moving when a magnetic force is generated in the fixed core, and connected to the movable core And an instant bar for linearly moving the movable core, a cross bar for rotating the instant bar while moving in connection with the instant bar, and an adjusting dial for moving the cross bar to vary the distance between the movable core and the fixed core. An upper core fixed to a portion around the movable core in the coil to reinforce the magnetic force generated from the fixed core, a torsion spring installed at one end of the cross bar to provide a restoring force when the cross bar rotates, and one end of the instant bar The instantaneous tripping device of the circuit breaker, characterized in that the instant bar further comprises a tension spring to add a restoring force during rotation. The method of claim 1, The upper end of the fixed core has a concave concave shape toward the movable core, the lower end of the movable core opposite to this is formed so as to taper upward to correspond to the concave shape of the fixed core Shut off trip device.