WO2013100504A1

WO2013100504A1 - Instant adjusting device for molded case circuit breaker

Info

Publication number: WO2013100504A1
Application number: PCT/KR2012/011331
Authority: WO
Inventors: 김세용; 전영민
Original assignee: 현대중공업 주식회사
Priority date: 2011-12-28
Filing date: 2012-12-23
Publication date: 2013-07-04
Also published as: EP2800122A4; KR101206540B1; EP2800122B1; EP2800122A1; RU2573642C1

Abstract

A molded case circuit breaker of the disclosed technology is connected to a main circuit to allow current to flow through the circuit breaker. The molded case circuit breaker comprises a fixed contact, a movable contact, a switching device, a handle, a trip unit and an arc quenching unit. The trip unit includes a fixed magnet fixed at the main circuit and generates an electromagnetic force when an abnormal current flows through the main circuit; an armature, one end of which is spaced apart from the fixed magnet by a fixed spacing and the other end of which has a stepped tilt surface for enabling the other end to contact the fixed magnet during rotation; and an instant bar which contacts the stepped tilt surface of the armature and moves linearly in left and right directions to rotate the armature such that the spacing between the fixed magnet and the armature can be adjusted. The molded case circuit breaker of the present invention is configured such that the armature has the stepped tilt surface having a tilt angle and such that the instant bar rotates the armature through left and right linear motions, and thus can adjust the spacing between the fixed magnet and the armature and set the size of the abnormal current where a trip may occur.

Description

Instantaneous adjustable device of circuit breaker

The present application relates to an instantaneous adjustment device for a circuit breaker, and more particularly, to an instantaneous temporary adjustment device for a circuit breaker that can improve the stability of the circuit breaker by precisely adjusting the distance between the fixed magnet and the amateur using the instant bar of the trip part. will be.

In general, a circuit breaker is an electrical safety device that protects a circuit and a load by automatically blocking a circuit when an abnormal current (i.e., overcurrent, instantaneous current, or short circuit current) flows between the power supply and the load.

The tripping of the instantaneous current among abnormal currents means detecting when the current of a certain magnification of the rated current is instantaneously applied to the circuit breaker and tripping it within a reasonable time without damaging the circuit or load for that magnification. The function is called instantaneous trip function.

Korean Patent Laid-Open No. 10-2006-0101035 discloses an instantaneous temporary adjusting device for a circuit breaker.

1 is a longitudinal cross-sectional view of an instantaneous temporary adjusting device of a conventional circuit breaker.

Referring to FIG. 1, the instantaneous temporary adjusting device 100 of the conventional circuit breaker is a magnet that is fixed to the main circuit and rotates by an electromagnetic force of the magnet 110 and the magnet 110, which generate an electromagnetic force when an abnormal current is generated. 120, the crossbar 130 to rotate in conjunction with the operation of the amateur 120, the shooter 140 to cause the operation of the mechanism in conjunction with the operation of the crossbar 130 to perform a circuit breaking operation, the amateur ( The instant spring 150 to limit the operating range to the current by applying a load in the opposite direction to the rotation direction 130, the instant bar 160 to adjust the operating current value by adjusting the load of the instant spring 150 and the user It consists of an instant dial 170 to specify the position of the instant bar (160).

By such a configuration, the electromagnetic force generated between the magnet 110 and the amateur 120 when an abnormal current is generated is inversely proportional to the load applied by the amateur spring 150. Therefore, in order for the user to trip at a higher current, the instant dial 170 is rotated to face the bottom surface of the inclination angle, and the instant bar 160 is contacted to raise the initial load value of the instant spring 150. Induce.

After setting the magnitude of the abnormal current in which the trip occurs in the above manner, when an abnormal current is generated on the line, the electromagnetic force is generated in the magnet 110, at this time due to the attraction force by the electromagnetic force of the magnet 110 By doing so, the amateur 120 is pulled and rotated counterclockwise to come into contact with the magnet 110. At this time, since the armature 120 is supported by the instant spring 150, the electromagnetic force should act as a force greater than the elastic force of the instant spring 150.

Since the instantaneous temporary adjusting device 100 of the conventional circuit breaker uses the elastic force of the instant spring 150, it is difficult to maintain the consistency of the load value due to the deviation (± 10%) of the instant spring 150 itself, the magnet and the amateur There is a problem that the interval between them cannot be adjusted constantly.

The present application is to solve the above-described problems, it is an object of the present invention to provide an instantaneous temporary adjusting device of a circuit breaker that can adjust the interval between the magnet and the amateur by using an instant bar.

Among the embodiments, the wiring breaker is connected to the main circuit to flow current, and includes a fixed contactor, a movable contactor, an opening / closing mechanism part, a handle, a tripping part and a extinguishing part, wherein the tripping part is fixed to the main circuit and is connected to the main circuit. Fixed magnet generating electromagnetic force when abnormal current occurs, one end is spaced apart from the fixed magnet at fixed intervals and the other end is formed with a stepped slope and the stepped slope of the amateur and the amateur to make contact with the fixed magnet during rotation And an instant bar that rotates the armature by performing a left and right linear motion to contact and adjust the distance between the fixed magnet and the armature.

In one embodiment, the wiring breaker further comprises an amateur support for supporting one end of the amateur and an amateur spring for connecting the amateur and the amateur support to provide elasticity for the rotation of the amateur according to the movement of the instant bar. can do.

In one embodiment, the instant dial may further include an instant dial formed with a groove formed on the top of the instantaneous current.

According to the disclosed technology of the present application, from the configuration of the amateur having a stepped inclined surface having an inclination angle and the instant bar for rotating the armature by performing the right and left linear movement of the abnormal current that the trip occurs by adjusting the distance between the fixed magnet and the amateur It has the effect of setting the size.

In addition, by forming a groove in which the instantaneous current is shaped on the top of the instant dial, there is an effect that can accurately set the magnitude of the abnormal current that the trip occurs.

1 is a longitudinal cross-sectional view of a trip part of a conventional circuit breaker.

2 is a cross-sectional view showing the structure of a typical circuit breaker.

3 is a perspective view illustrating a structure of a trip part of a circuit breaker according to an exemplary embodiment of the disclosed technology.

4 is a side view illustrating an operation of a trip part of the circuit breaker of FIG. 3.

5 is a perspective view illustrating an operation of a trip part of the circuit breaker of FIG. 3.

FIG. 6 is a diagram illustrating a state in which a plurality of tripping units of the circuit breaker of FIG. 3 are combined.

Description of the disclosed technology is only an embodiment for structural or functional description, the scope of the disclosed technology should not be construed as limited by the embodiments described in the text. That is, since the embodiments may be variously modified and may have various forms, the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea.

On the other hand, the meaning of the terms described in the present application should be understood as follows.

Terms such as "first" and "second" are intended to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, the first component may be named a second component, and similarly, the second component may also be named a first component.

The term “and / or” should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of "first item, second item and / or third item" may be given from two or more of the first, second or third items as well as the first, second or third items. Any combination of the possible items.

When a component is referred to as being "connected" to another component, it should be understood that there may be other components in between, although it may be directly connected to the other component. On the other hand, when a component is said to be "directly connected" to another component, it should be understood that there is no other component in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring", should be interpreted as well.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as "include" or "have" refer to features, numbers, steps, operations, components, parts, or parts thereof described. It is to be understood that the combination is intended to be present and does not exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

In each step, an identification code (e.g., a, b, c, etc.) is used for convenience of description, and the identification code does not describe the order of the steps, and each step clearly indicates a specific order in context. Unless stated otherwise, they may occur out of the order noted. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Generally, the terms defined in the dictionary used are to be interpreted to coincide with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present application.

2 is a cross-sectional view showing the structure of a typical circuit breaker.

Referring to FIG. 2, the circuit breaker includes a stator contactor 210 connected to a power supply side and a load side, a mover contactor 220 and a mover contactor 220 contacted and separated from the stator contactor 210 through a rotational motion. Opening and closing mechanism 230 for opening and closing the circuit by adjusting the, tripping unit 240 to detect the abnormal current (that is, overcurrent or instantaneous current and short-circuit current) to generate the operation of the opening and closing mechanism 230 to cut off the circuit The extinguishing arc 250 is configured to extinguish the arc generated when the circuit is cut off.

Referring to FIG. 3, the trip unit 240 of the circuit breaker has a fixed magnet 310 and a stepped inclined surface 321 which generate an electromagnetic force when an abnormal current occurs in the main circuit. An amateur 320 to be contactable and an instant bar 330 to rotate the amateur are included.

In one embodiment, the amateur support 340 and may further include an amateur spring 350 to connect the amateur 320 and the amateur support 340 to provide elasticity for the rotation of the amateur (320). In an embodiment, the instant bar 330 may further include an instant dial 360 having a groove 361 formed thereon with a value for the instantaneous current at the top.

The fixed magnet 310 is fixed to the main circuit. The fixed magnet 310 generates an electromagnetic force when an abnormal current occurs in the main circuit.

The armature 320 is spaced apart from the fixed magnet 310 at a fixed interval and is installed to be rotatable. The armature 320 comes into contact with the fixed magnet 310 when rotated. The other end of the amateur 320 is a stepped slope 321 is formed. In one embodiment, the amateur 320 may further include a coupling protrusion 322 to fix the instant spring 350.

When the instant bar 330 performs the left and right linear motion, one end is in contact with the stepped inclined surface 321 of the armature 320, and the fixed magnet 310 is rotated by rotating the armature 320 according to the height difference of the stepped inclined surface 321. And the distance between the armature (320). In one embodiment, the instant bar 330 is in contact with the stepped slope 321 of the plurality of amateurs 320 to adjust the spacing of each of the plurality of amateurs 320 and each of the plurality of stationary magnets 310. Can be.

The amateur support 340 supports one end of the amateur and fixes one end of the amateur spring 350.

The amateur spring 350 connects the amateur 320 and the amateur support 340 to provide elasticity for the rotation of the amateur 320 according to the movement of the instant bar 330.

The instant dial 360 is coupled to the instant bar 330, and when the instant dial 360 rotates, the instant bar 330 is linearly moved left and right. In an embodiment, the instant dial 360 may have a groove 361 formed at a top thereof in which a value for instantaneous current is shaped. Therefore, the instant dial 360 can be easily rotated by engaging the driver.

4 is a side view illustrating an operation of the trip unit of the circuit breaker of FIG. 3, and FIG. 5 is a perspective view illustrating an operation of the trip unit of the circuit breaker of FIG. 3.

4 and 5, when the instant dial 360 is rotated, the instant bar 330 performs left and right linear movements, and one end of the instant bar 330 is a stepped slope 321 of the armature 320. In contact with each other, the armature 320 is rotated according to the height difference of the stepped slope 321 to adjust the distance between the fixed magnet 310 and the armature 320. That is, the magnitude of the abnormal current in which the trip occurs is set.

When the abnormal current is generated, the electromagnetic force generated by the fixed magnet 310 increases in inverse proportion to the distance between the fixed magnet 310 and the amateur 320. Therefore, to cause the trip to occur at a higher current than the preset current, the instant dial 360 is rotated so that the one side of the high side 321b and the instant bar 330 of the stepped slope 321 of the armature 320 is rotated. Make contact.

When the height 321b of the stepped slope 321 of the armature 320 and the one end of the instant bar 330 are in contact with each other, the armature 320 rotates toward the stationary magnet 310 and the stationary magnet 310 and the armature ( The spacing between 320 becomes narrower, and therefore, the amateur spring 350 is further tensioned to greatly increase the elastic force.

On the contrary, in order to cause the trip to occur at a current lower than the preset current, the instant dial 360 is rotated so that the lower side 321a of the stepped slope 321 of the armature 320 and the one end of the instant bar 330 are rotated. Make contact.

When the lower side 321a of the stepped inclined surface 321 of the armature 320 and the one end of the instant bar 330 are in contact with each other, the armature 320 rotates to the opposite side of the stationary magnet 310 and the stationary magnet 310. The spacing between the armatures 320 becomes wider, and therefore, the armature springs 350 are more compressed so that the elastic force acts less.

After setting the magnitude of the abnormal current in which the trip occurs in the same manner as described above, when an abnormal current occurs in the main circuit, an electromagnetic force is generated in the fixed magnet 310, and the armature At work 320).

Since the armature 320 is supported by the armature spring 350, when the attraction force acting on the armature 320 by the electromagnetic force of the fixed magnet 310 acts with a force greater than the elastic force of the armature spring 350, the armature ( 320 is rotated to contact the fixed magnet 310.

FIG. 6 is a diagram illustrating a cross bar and a shooter connected to a plurality of trip parts of FIG. 3.

Referring to FIG. 6, one end of the amateur 320 is connected to the crossbar 610, and the other end of the crossbar 610 is connected to the shooter 620.

In one embodiment, when the armature 320 of the tripping part 240 rotates to contact the fixed magnet 310, the armature 320 may press the lower end of the crossbar 610. In one embodiment, the crossbar 610 restrains the shooter 620, and the shooter 620 is connected to the opening and closing mechanism so that when the crossbar 610 rotates, the restrained state of the shooter 620 restrained on the crossbar 610 is rotated. Is released and the opening and closing mechanism 240 may be tripped.

Therefore, when the armature 320 rotates to contact the fixed magnet 310, the armature 320 presses the lower end of the crossbar 610 to rotate the crossbar 610 clockwise, and the crossbar 610 clockwise. Rotation of the release mechanism releases the restraint state of the shooter 620 restrained on the crossbar 610 and trips the opening and closing mechanism.

In addition, by forming a groove in which the instantaneous current value is shaped at the top of the instant dial, there is an effect of setting the magnitude of the abnormal current in which the trip occurs.

Although described above with reference to a preferred embodiment of the present application, those skilled in the art various modifications and changes to the present application without departing from the spirit and scope of the present application described in the claims below I can understand that you can.

Claims

In the circuit breaker for connecting the main circuit, the current flows, and includes a fixed contactor, a movable contactor, an opening and closing mechanism, a tripping portion and a arc extinguishing portion,

The trip part

A fixed magnet fixed to the main circuit and generating an electromagnetic force when an abnormal current occurs in the main circuit;

An arm having one end spaced apart from the fixed magnet at a fixed interval and the other end having a stepped inclined surface and making contact with the fixed magnet during rotation; And

And an instant bar contacting the stepped inclined surface of the amateur to perform the left and right linear movements to adjust the distance between the fixed magnet and the amateur to rotate the amateur.
The method of claim 1,

An amateur support for supporting one end of the amateur; And

And an amateur spring which connects the amateur and the amateur support to provide elasticity for the rotation of the amateur according to the movement of the instant bar.
The method of claim 1, wherein the instant bar

The circuit breaker of claim 2, further comprising the instant dial formed with a groove formed at the top of the instantaneous current value.