KR100631829B1 - Pressure trip device of the circuit breaker - Google Patents

Abstract

The present invention relates to a pressure trip device for a circuit breaker, and shortens the trip time of the circuit breaker during a short circuit current, thereby improving breaking performance and preventing fusion between contacts.

The pressure trip device for a circuit breaker according to the present invention for this purpose, the opening and closing mechanism portion including a movable contactor and a fixed contactor for opening and closing each current circuit, and arcs generated when the contact between the movable contactor and the fixed contactor is opened. And a phase single pole blocking unit configured to seal and store the arc extinguishing portion in a case of an insulator, and at least one of the phase single pole blocking units has an arc gas introduction hole formed at a position of the arc extinguishing portion on a side of the case. And a main circuit opening and closing mechanism connected to the single pole blocking unit to interlock the single pole blocking unit, wherein the main circuit opening and closing mechanism trips the side wall supporting the main circuit opening and closing mechanism on both sides and the main circuit opening and closing mechanism. A trip bar on the side of the case provided with the arc gas exhaust hole; It is installed to be movable in the vertical direction opposite the bar and provided with a gas pressure shooter for pressing and rotating the trip bar by moving upward by the arc gas pressure from the arc gas introduction hole when the arc is generated, the arc gas introduction hole is provided On the side of the case is formed to extend vertically long from the formation position of the arc gas introduction hole, the first groove for guiding the vertical movement of the gas pressure shooter, and on the side of the case provided with the arc gas introduction hole A second groove which is spaced downward from the first groove and vertically shorter than the first groove, and which limits a vertical movement distance of the gas pressure shooter, and is provided in the gas pressure shooter and provided in the first groove. Vertical movement is guided, and by arc gas pressure from the arc gas introduction hole In addition, the fitting portion is pressed upwards, and the gas pressure shooter is formed to protrude lower than the fitting portion, and is fitted into the second groove and the locking jaw to guide the vertical movement and at the same time limit the vertical movement distance It is composed.

Description

PRESSURE TRIP DEVICE OF THE CIRCUIT BREAKER}

1 and 2 are a side configuration view and a perspective view of a circuit breaker according to the prior art

Figure 3 is an operating state diagram showing a state of forming the engaging portion of the circuit breaker according to the prior art

Figure 4 is an operating state diagram showing a latch release state of the circuit breaker according to the prior art

5 is a perspective view of a pressure trip device for a circuit breaker according to the present invention;

6 is a view showing the operating state of the movable contactor and the fixed contactor assembled in the single-pole breaking unit of the circuit breaker according to the present invention,

  6A is an operation state diagram when a steady current flows in a closed state;

  6b is a current-limiting operation diagram between the movable contactor and the fixed contactor when an accident current occurs;

  6C is a state diagram illustrating a state in which an arc is generated due to separation between contacts attached to the movable contactor and the fixed contactor, respectively.

  Figure 6d is a state diagram showing a state in which the arc gas generated by the arc is discharged to the outside of the monopole blocking unit.

7A and 7B are diagrams illustrating a configuration of a single pole blocking unit in which a shooter is assembled in the circuit breaker for wiring according to the present invention and a shooter assembled in the groove of the single pole blocking unit;

8A and 8B are views illustrating an operation state in which the shooter is displaced by arc pressure due to an arc in the circuit breaker according to the present invention.

9A and 9B illustrate an operation in which a shooter acts in a vertical direction and is displaced by an arc pressure caused by an arc in the circuit breaker for wiring according to the present invention, and an operation in which the trip bar rotates by tripping by the displacement generated in the shooter to trip the mechanism part.

<< Explanation of symbols for main part of drawing >>

2: single pole blocking unit 3: side plate

4: trip bar 10: movable contactor

11: fixed contactor 12: gas pressure shooter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, a pressure trip device of a circuit breaker that trips a circuit breaker faster by using an arc gas pressure generated when the movable contact and the fixed contact are separated with respect to an accident current. ).

1 and 2 are a side configuration view and a perspective view of a circuit breaker according to the prior art.

As shown in FIG. 1 and FIG. 2, a wiring circuit breaker composed of a conventional single-pole breaking unit 2 is provided with respect to an enclosure 1 for protecting a mechanism and a current flowing into the circuit breaker by being assembled inside the enclosure 1. A magnetic core (5) for generating an electromagnetic force, an armature (6) sucked into the magnetic core (5) due to the electromagnetic force, and a crossbar driven due to the driving of the armature (6) 7), a trip shooter 8 driven by the crossbar 7, a spring 9 causing the driving force of the trip shooter 8, and the trip shooter 8 to rotate, It consists of a trip bar 4 which trips a mechanism part.

Next, FIG. 3 is an operational state diagram showing a state of forming a latching portion of the circuit breaker according to the prior art, and FIG. 4 is an operating state diagram showing a state of releasing the latching portion of the circuit breaker according to the prior art.

In the conventional circuit breaker, as shown in FIG. 3, when the steady current flows, the trip shooter 8 is constrained by the crossbar 7 so that the trip bar 4 can maintain the reset position. However, as shown in FIG. 4, in the instantaneous current and the excess current, the electromagnetic force of the magnetic core 5 sucks the armature 6 so that a part of the armature 6 is connected to the crossbar 7. By rotating, the locking portion of the trip shooter 8 restrained by the crossbar 7 is released to release the restraint, and the trip shooter 8 rotated by the elastic force of the spring 9 assembled to the trip shooter 8. ) Rotates the trip bar 4, which causes the trip bar 4 to trip out of the reset position, thereby tripping the mechanism part.

In this conventional technology, when a short circuit current flows, the mechanism part is tripped through a multi-step mechanism operation, and thus a lot of breaking energy is generated due to time delay, and fusion between the movable contactor and the stator contact due to time delay may also occur.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to reduce the trip time of the circuit breaker in the short circuit current to improve the breaking performance and prevent the welding between the circuit breaker pressure tripping device To provide.

The pressure trip device for a circuit breaker according to the present invention for achieving the above object is generated at the time of opening and closing a contact portion between the movable contactor and the fixed contactor, the opening and closing mechanism including a movable contactor and a fixed contactor for opening and closing each current circuit. And a phase single pole blocking unit for sealing an arc arc for extinguishing an arc into a case of an insulator, wherein at least one of the phase single pole blocking units is formed at the arc extinguishing position on a side of the case. A main circuit opening / closing mechanism connected to the single pole blocking unit and interlocking with the single pole blocking unit, wherein the main circuit opening / closing mechanism has sidewalls supporting the main circuit opening / closing mechanism from both sides and the main circuit opening / closing mechanism; A trip bar for tripping the mechanism, the side of the case having the arc gas exhaust hole; And a gas pressure shooter installed on the surface so as to be movable in the vertical direction opposite to the trip bar, and moving upwardly by the arc gas pressure from the arc gas introduction hole when the arc is generated to pressurize and rotate the trip bar. The first groove is formed to extend vertically from the position of the arc gas introduction hole is formed on the side of the case having an introduction hole to guide the vertical movement of the gas pressure shooter, and the arc gas introduction hole A second groove formed on the side surface of the case and spaced downward from the first groove and vertically shorter than the first groove, the second groove restricting a vertical movement distance of the gas pressure shooter; The vertical movement is guided by being inserted into the first groove, and when arcing occurs, the arc from the arc gas introduction hole The fitting portion of which the bottom surface is pressurized upward by the gas pressure and protruding lower than the fitting portion in the gas pressure shooter, are fitted into the second groove to guide the vertical movement and at the same time limit the vertical movement distance. It is configured to include additionally.

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Hereinafter, the configuration of the present invention with reference to the drawings in detail.

As shown in FIGS. 5 and 6, the pressure trip device of the circuit breaker includes a movable contactor (10 of FIGS. 6A-6D) and a fixed contactor (11 of FIGS. 6A-6D) to open and close current circuits of respective phases. It comprises a phase-specific single-pole blocking unit (2) sealed and embedded in the outer case (case) made of an electrical insulator, and equipped with an arc gas discharge hole and / or an arc gas introduction hole 2b. . The single-pole breaking unit 2 may be provided with two or three when the circuit breaker for three phases is used, and in the state of accommodating the movable contactor, the fixed contactor, and the arc extinguisher section therein, the resin material of the electrical insulation material may be molded ( It can be manufactured by moulding, and the parts other than the arc gas discharge hole and / or the arc gas introduction hole 2b are completely sealed in order to effectively use the arc gas generated when the contact is opened. Each of the single pole blocking units 2 is configured to simultaneously connect with each other by connecting a separate shaft (not shown) to a separate shaft for rotatably supporting the movable contactor or the movable contact in each single pole blocking unit 2.

The pressure trip device of the circuit breaker for wiring according to the present invention is connected to the single-pole breaking unit 2 to open and close the main circuit for opening and closing the movable contact in the single-pole breaking unit 2 to a position in contact with the fixed contactor or to be separated from the fixed contactor. And a trip bar 4 for tripping the main circuit opening and closing mechanism. The main circuit opening and closing mechanism includes a handle not designated on the drawing installed between the side plates 3, a latch connected to the handle, a movable contact 10 connected to the handle by a latch and a link, and the handle. And a spring mounted between the links, wherein the trip bar 4 operates the main circuit opening and closing mechanism to a circuit connection or a circuit breaking (trip) position by restraining or restraining the latch. The configuration of the main circuit opening and closing mechanism and the trip bar are well-known configurations, and detailed description thereof will be omitted.

Here, at least one of the phase single pole blocking units 2 is formed at the arc extinguishing position on the side of the case, and is provided with an arc gas introduction hole 2b for obtaining power of the trip using gas pressure. The pressure trip device of the circuit breaker according to the present invention includes side walls 3 for supporting the main circuit opening and closing mechanism and the trip bar 4 on both sides. In addition, the pressure trip device of the circuit breaker according to the present invention is installed to be movable in the vertical direction opposite the trip bar 4 on the side of the case provided with the arc gas introduction hole (2b), when the arc is generated And a gas pressure shooter 12 which moves upward by the arc gas pressure from the gas introduction hole 2b to pressurize and rotate the trip bar.

In the circuit breaker according to the present invention, the single pole blocking unit 2 having the first groove 2a and the second groove 2c to which the gas pressure shooter 12 is assembled, and the first groove 2a of the single pole blocking unit 2 are formed. 7A and 7B, which illustrate the configuration of the gas pressure shooter 12 assembled to the second groove 2c, are as follows.

As shown in FIG. 7A, the first groove 2a extends vertically long from the formation position of the arc gas introduction hole 2b on the side of the case provided with the arc gas introduction hole 2b. The vertical movement of the gas pressure shooter 12 is guided.

The pressure trip device of the circuit breaker according to the present invention is vertically spaced downward from the first groove 2a on the side surface of the case provided with the arc gas introduction hole 2b as shown in FIG. 7A. The second groove 2c is formed to have a predetermined length shorter than the groove 2a. The second groove 2c is formed in advance by a vertical distance necessary for the tip end portion of the gas pressure shooter 12 to move vertically upward to press and rotate the trip bar 4, and thus, the gas pressure shooter ( When 12) moves upwards, the movement distance is limited by the length of the second groove 2c. The arc gas introduction hole 2b is formed obliquely upwardly from the arc extinguishing mechanism part in the monopole blocking unit 2 to the outside of the case as shown in the right sectional view and enlarged A part of FIG. It is formed in communication with the lower end of 2a).

In addition, the pressure trip device of the circuit breaker according to the present invention, as shown in Figure 7b, is provided in the gas pressure shooter 12 and fitted into the first groove (2a) to guide the vertical movement, when the arc gas introduction hole The fitting part 12a which a bottom face is pressurized upward by the arc gas pressure from (2b) is included.

A pair of locking projections 12b protruding lower than the fitting portion 12a in the gas pressure shooter 12 and fitted in the second groove 2c to guide the vertical movement and limit the vertical movement distance are provided. .

On the other hand, with reference to Figures 6, 8 and 9 will be described the operation of the pressure trip device of the circuit breaker according to the present invention.

The pressure trip device of the circuit breaker is applied to the electromagnetic repulsive force between the fixed contact 11 and the movable contact 10 inside the single-pole breaking unit 2 when an accident current such as a short circuit current flows. The arc occurs due to the gap between the contacts. As shown in FIG. 8, the arc gas by the arc is a gas pressure shooter 12 assembled outside the single pole blocking unit 2 through an arc gas introduction hole (2b of FIG. 7A) of the single pole blocking unit 2. It acts on the bottom face of the intermediate | middle fitting part 12a, ie, presses a bottom face. As a result, the gas pressure shooter 12 is displaced vertically upward by the length of the second groove 2c along the outer surface of the case of the single-pole blocking unit 2, and as shown in FIG. 9. The inclined surface is pressed against a part of the trip bar 4 to rotate the trip bar 4 so that the trip bar 4 is out of the reset position so that the main circuit opening and closing mechanism operates in the trip position. According to the trip position operation of the main circuit switchgear, the movable contactor in the lower single pole blocker unit 2 connected to the main circuit switchgear maintains the position separated from the fixed contactor. It is driven to the trip position (circuit blocking position) by interlocking.

On the other hand, when the gas pressure shooter 12, that is, the arc gas pressure acting on the bottom face of the fitting portion 12a is extinguished, the gas pressure shooter 12 automatically returns to the original position downward by its own weight.

Although the present invention described above is limited to one embodiment, the present invention is not limited thereto, and the present invention may be easily modified by those of ordinary skill in the art to which the present invention pertains. It is obvious that it belongs to the technical idea.

As described above, according to the pressure trip device of the circuit breaker according to the present invention, it is caused by the opening between the contacts attached to the movable contactor 10 and the fixed contactor 11 respectively assembled inside the single-pole breaking unit 2. Since the arc pressure that has been driven drives the shooter 12 assembled to the outside of the single-pole breaking unit 2 and rotates the trip bar 4 by the displacement of the shooter 12, the circuit breaker is immediately tripped. Compared to the process of tripping the mechanism part, the mechanism part is tripped in a faster time, which shortens the time the arc stays in the mechanism part, thereby improving the performance of the circuit breaker, and welding phenomenon by contact reconnection due to time delay during short circuit. Can also be prevented.

Claims (2)

delete In the circuit breaker for wiring, A phase opening and closing mechanism including a movable contactor and a fixed contactor for opening and closing each current circuit, and an arc extinguishing portion for enclosing an arc generated when opening a contact between the movable contactor and the fixed contactor in a case of an insulator. A single pole blocking unit, at least one of the phase single pole blocking units includes an arc gas introduction hole formed at a position of the arc extinguishing portion on a side surface of the case; A main circuit opening and closing mechanism connected to the single pole blocking unit and interlocking the single pole blocking unit, wherein the main circuit opening and closing mechanism includes a sidewall supporting the main circuit opening and closing mechanism on both sides and a trip bar for tripping the main circuit opening and closing mechanism. Equipped, The trip bar is installed on the side of the case provided with the arc gas exhaust hole so as to be movable in the vertical direction, and when the arc is generated to move upward by the arc gas pressure from the arc gas introduction hole to pressurize the trip bar and It has a gas pressure shooter to rotate, A first groove formed on the side of the case having the arc gas introduction hole and extending vertically from the formation position of the arc gas introduction hole to guide the vertical movement of the gas pressure shooter, and the arc gas introduction hole A second groove formed on the side surface of the case and spaced downward from the first groove and vertically shorter than the first groove to limit a vertical movement distance of the gas pressure shooter, and the gas pressure shooter And a fitting portion provided in the first groove to guide the vertical movement, the bottom portion being pressed upward by the arc gas pressure from the arc gas introduction hole when the arc is generated, and protruding lower than the fitting portion to the gas pressure shooter. A locking jaw formed in the second groove to guide the vertical movement and at the same time limit the vertical movement distance. Pressure trip device of the circuit breaker, characterized in that comprises a.

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