KR100616086B1 - Circuit breaker with pressure trip device - Google Patents

Abstract

The present invention relates to a pressure trip device of a circuit breaker, wherein the arc gas pressure generated by the opening between the contacts attached to the movable contactor 10 and the fixed contactor 11 assembled inside the single-pole breaking unit 2 is a single pole. A support member 13 for driving the pressure trip unit 12 assembled outside the blocking unit 2 and forming the outside of the pressure trip unit 12 and a gas pressure transmission lever assembled inside the pressure trip unit 12 ( 15) and the gas pressure shooter 14 by rotating the trip bar (4) by the operation of the circuit breaker for the trip immediately because the trip circuit breaker trips the mechanism faster than the trip process through the conventional multi-stage mechanism operation, the arc is the mechanism It can shorten the dwell time and improve the performance of the circuit breaker, and also prevent the welding phenomenon by contact reconnection due to short time delay.

Description

Circuit Breaker with Pressure Trip Device {A CIRCUIT BREAKER HAVING A PRESSURE TRIP DEVICE}

1 is a side cross-sectional view of a circuit breaker according to the related art.

Figure 2 is a perspective view of the main part of the circuit breaker showing the configuration of the single-pole breaking unit and the main circuit switchgear and trip mechanism of the circuit breaker according to the prior art

3 is a perspective view and an enlarged view illustrating an interlocking configuration of a tripping mechanism and a main circuit switching mechanism of a circuit breaker according to the related art, and showing a tripping state of the tripping mechanism during normal current energization on a circuit;

4 is a perspective view and an enlarged view illustrating an interlocking configuration between a trip mechanism part and a main circuit switchgear of a circuit breaker according to the related art, illustrating a state in which a trip mechanism operates when an accident current is energized in a circuit;

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

  5A is a perspective view of a pressure trip device assembled to a single-pole breaking unit of a circuit breaker;

 5B is a perspective view illustrating an outer wall of the press trip device only and an inner wall of the support member with the front cover of the support member removed from the press trip device.

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,

  6B is a current-limiting operation diagram between the movable contactor and the fixed contactor when a current-limiting current flows,

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

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

7A is a view showing a state in which the arc gas generated in the circuit breaker according to the present invention is applied to the pressure plate portion of the pressure trip lever and the gas pressure transmission lever is displaced in the horizontal direction by the arc gas pressure.

7B is a view showing a horizontal displacement of the gas pressure transmission lever due to the arc pressure and a vertical displacement of the gas pressure shooter due to the horizontal displacement of the gas pressure transmission lever.

8a and 8b is a state in which the gas pressure transfer lever is displaced in the horizontal direction by the arc gas pressure in the circuit breaker for wiring according to the present invention (b) and the gas pressure shooter in the vertical direction by the gas pressure transfer lever (c) and the Explanatory drawing of operation (d) in which the trip bar rotates to trip the mechanism by the vertical displacement of the gas pressure shooter

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

2: single pole blocking unit 3: side wall

4: trip bar 10: movable contactor

11: fixed contactor

12: pressure trip unit or pressure trip unit

13 support member 14 gas pressure shooter

15: gas pressure transmission lever

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and in particular, by using an arc gas pressure generated when two contacts are separated by an electromagnetic repulsive force generated between the movable contactor and the fixed contactor against an accident current (called a current-limiting operation). The present invention relates to a circuit breaker having a pressure trip device for quickly tripping a circuit breaker.

Figure 1 is a side cross-sectional view of a circuit breaker according to the prior art, Figure 2 is a perspective view of the main part of the circuit breaker showing the configuration of the single-pole breaking unit and the main circuit opening and closing mechanism of the circuit breaker according to the prior art.

As shown in FIGS. 1 and 2, a circuit breaker for wiring comprising a conventional single-pole breaking unit 2 and a tripping mechanism includes a main enclosure, a movable contactor, a fixed contactor, and an arc extinguishing mechanism for protecting the internal mechanism. Phase single-pole blocking unit 2 and main circuit opening / closing mechanism for driving the single-pole blocking unit 2 (an internal mechanism of reference numeral 3 comprising a handle, a latch, an opening / closing spring, a link, and the like, and a movable contact in the single-pole blocking unit). It is a mechanism that provides a driving force to and simultaneously interlocks the single-pole blocking unit of each phase, not shown), the side plate (3) for supporting the main circuit opening and closing mechanism, and a tripping mechanism assembled inside the enclosure (1) for wiring. A magnetic core 5 that generates an electromagnetic force with respect to an electric current flowing to the breaker, an armature 6 that is attracted to the magnetic core 5 due to the electromagnetic force, and the driving of the amateur 6 Ugh Due to the crossbar (7) driven, the trip shooter (8) driven by the crossbar (7), the spring (9) causing the driving force of the trip shooter 8, and the trip shooter (8) And a trip mechanism including a trip bar 4 for tripping the mechanism part by rotating by &lt; RTI ID = 0.0 &gt;

Next, FIG. 3 is a perspective view and an enlarged view illustrating an interlocking configuration between a tripping mechanism and a main circuit switching mechanism of a circuit breaker according to the prior art, and a diagram showing a non-operating state of a tripping mechanism when a normal current is energized in a circuit. Is a perspective view and an enlarged view of a main part showing an interlocking configuration between a trip mechanism part of a circuit breaker and a main circuit switchgear according to the related art, and shows a state in which the trip mechanism operates when an accident current is energized in a circuit.

As shown in FIG. 3, the magnetic circuit of the magnetic core 5 is weak when the normal current flows on the circuit in which the circuit breaker is installed. The trip bar 4 is restrained so that the trip bar 4 maintains the reset position. However, as shown in FIG. 4, when an accident current such as a short circuit current or a ground fault current flows in the circuit, the magnetic core 5 is strongly magnetized by a large accident current to suck the armature 6, The trip part constrained by the crossbar 7 as the upper end of the suctioned armature 6 presses the lower end of the crossbar 7 so that the crossbar 7 rotates clockwise in the drawing about its axis of rotation. The shooter 8 is released and the trip shooter 8 released by the elastic restoring force of the spring 9 assembled to the trip shooter 8 rotates counterclockwise in the drawing to press the trip bar 4. Rotate clockwise on the drawing. As the trip bar 4 rotates, a trip is performed in which the movable contact in the single-pole breaking unit 2 is separated from the fixed contact by a main circuit opening / closing mechanism (not shown). As is well known because the detailed illustration and description will be omitted, the operation of the series main circuit switchgear will be briefly described. By pressing and rotating the latch holder included in the main circuit opening and closing mechanism to release the latch, the latch is rotated while the opening and closing spring is elastically restored. The rotation of the support shaft supporting the contactor causes a series of tripping operations in which the movable contactor is separated from the fixed contactor.

In the conventional technology, when an accident current flows, the mechanical part is tripped through a multi-step mechanical operation, and thus the breaking energy due to time delay increases rapidly, and excessive increase of the breaking energy damages the main body and the mechanical part of the circuit breaker. Serious problems such as fusion between the contactor and the fixed contactor can be caused, which can have a fatal effect on the reliability of the circuit breaker.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to reduce the tripping time of the circuit breaker in the event of an accident current to minimize the breaking energy, thereby preventing the fusion between the contacts for improved wiring performance The present invention provides a break trip device.

An object of the present invention is a circuit breaker,

A phase opening and closing mechanism including a movable contactor and a fixed contactor for opening and closing a current circuit for each phase, 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, wherein at least one of the phase single pole blocking units is provided with an arc gas exhaust port formed at a position of the arc extinguishing portion of one surface of the case;

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 includes sidewalls supporting the main circuit opening and closing mechanism on both sides, and a trip bar for tripping the main circuit opening and closing mechanism. and;

It is provided at the opposite end portion of the pressure plate to convert the horizontal power obtained from the pressure plate portion to the vertical power and the pressure plate portion receiving the arc gas pressure exhausted and positioned opposite to the arc gas exhaust port to obtain the power to move horizontally A gas pressure transmission lever having a first inclined surface;

A second inclined surface corresponding to the first inclined surface of the gas pressure transmission lever and having a second inclined surface for converting the horizontal power of the gas pressure transmission lever into a vertical power, and pressurizing the trip bar or pressing the trip bar; A gas pressure shooter installed to be movable in a vertical direction to a position for releasing the gas, and converting the horizontal power from the gas pressure transmission lever horizontally moving when the arc is generated into vertical power and moving upward to pressurize and rotate the trip bar;

Achievement by providing a circuit breaker with a pressure trip device according to the invention, characterized in that it comprises a support member having an inner support wall for supporting and guiding the gas pressure transfer lever and the gas pressure shooter. Can be.

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

FIG. 5 is a perspective view of a pressure trip device of a circuit breaker according to the present invention, and FIG. 5A is a perspective view of a pressure trip device assembled to a single-pole breaking unit of a circuit breaker, and FIG. 5B is an external perspective view of the pressure trip device alone and a pressure trip device. A perspective view showing the inner wall of the support member with the front cover of the support member removed.

As shown in FIG. 5, a circuit breaker having a pressure trip device according to the present invention includes a switch including a movable contactor and a fixed contactor (see numerals 10 and 11 of FIGS. 6A and 6B) for opening and closing each current circuit. The phase single pole blocking unit 2, which includes a bent portion and an arc extinguishing portion for enclosing an arc generated when opening a contact between the movable contactor and the fixed contactor in a casing of an insulator, is included in the phase single pole blocking unit 2; At least one arc gas exhaust port formed at a position of the arc extinguishing portion (see a plurality of rectangular members stacked adjacent to both contact portions of FIGS. 6A and 6B) of one surface of the case (see symbol 2a of FIGS. 6A and 6B) And a main circuit switch mechanism connected to the single pole block unit 2 to interlock the single pole block unit 2, wherein the main circuit switch mechanism supports the main circuit switch mechanism from both sides. A side wall (3) and a trip bar (4) for tripping the main circuit opening and closing mechanism, and the pressure trip device (12) according to the present invention, facing the arc gas exhaust port in order to obtain a power to move horizontally Pressure plate portion 15a which receives the arc gas pressure which is located and exhausted, and first inclined surface 15b provided at the opposite end of pressure plate portion 15a to convert the horizontal power obtained from pressure plate portion 15a into vertical power and transfer the same. A gas pressure transmission lever 15 having a; It is provided at the lower end corresponding to the first inclined surface 15b of the gas pressure transmission lever 15, and has a second inclined surface 14a for converting the horizontal power of the gas pressure transmission lever 15 into vertical power and having a trip bar. (4) It is installed so as to be movable in the vertical direction to the position to release the pressure to the trip bar (4), converting the horizontal power from the gas pressure transmission lever 15 that moves horizontally when the arc is generated into vertical power And a gas pressure shooter 14 which presses and rotates the trip bar 4 to move upward, and an internal support wall part for supporting and guiding the gas pressure transmission lever 15 and the gas pressure shooter 14 to be movable. The member 13 is comprised.

As shown in FIGS. 6A and 6B, the phase-unipolar single-block unit 2 includes the movable contactor 10 and the fixed contactor 11 and the extinguishing mechanism part (see a stack of rectangular members located near the contact point of the movable contactor and the fixed contactor). The main configuration is The main circuit opening / closing mechanism for driving the single pole blocking unit 2 (indicated by an internal mechanism of reference numeral 3 is composed of a handle, a latch, an opening / closing spring, a link, etc.) and a driving force on the movable contactor within the single pole blocking unit 2. It is a mechanism for simultaneously interlocking the single-pole blocking unit of each phase at the same time (not shown) is disposed, side plates (3) for supporting the main circuit opening and closing mechanism is provided on both sides of the main circuit opening and closing mechanism. In addition, a gas pressure trip device 12 is provided as a trip mechanism according to the present invention at a position facing the trip bar 4 on one side of the single pole blocking unit 2.

In FIG. 5B, the inner support wall portions of the support member 13 are spaced apart from each other by a predetermined distance larger than the width of the gas pressure shooter 14 (the width of the middle and lower ends excluding the upper end of the gas pressure shooter 14) by a predetermined margin width. Pairs of opposed protruding wall portions 13a and 13b. Therefore, when vertically raising and lowering in conjunction with the horizontal movement of the gas pressure transmission lever 15, the gas pressure shooter 14 guides the pair 13a and 13b of the protruding wall portion with a small margin on the upper, middle and lower portions, respectively. Therefore, it does not tilt and rises and falls in a vertical straight line.

In addition, the support member 13 further includes a horizontal movement limiting wall portion 13c having an inclined surface opposite to the first inclined surface 15b of the gas pressure transmission lever 15 to limit the horizontal movement of the gas pressure transmission lever 15. For this reason, when the arc gas is discharged through the exhaust port 2a, the gas pressure transmission lever 15 can be restricted so as not to move horizontally more than necessary.

Then, the movement of the gas pressure shooter 14 to move in the vertical direction to adjust the stroke of the gas pressure shooter 14 to pressurize the trip bar 4 during the trip operation by adjusting the length of the first inclined surface 15b of the gas pressure transfer lever 15. You can adjust the distance.

6 is a view showing the operating state of the movable contactor and the fixed contactor assembled inside the single-pole breaking unit of the circuit breaker according to the present invention. FIG. 6A is an operation state diagram when a steady current flows, and FIG. FIG. 6C is a state diagram illustrating an arc generated due to separation between the contacts attached to the movable contactor and the fixed contactor, and FIG. 6D shows the generated arc gas as a single pole blocking unit. It is a state diagram showing the state discharged to the outside.

7A is a view showing the arc gas generated in the circuit breaker according to the present invention is applied to the pressure plate portion of the pressure trip lever and the gas pressure transmission lever in a horizontal direction by arc gas pressure, Figure 7b is an arc pressure Figure 2 shows the horizontal displacement of the gas pressure transmission lever and the vertical displacement of the gas pressure shooter by the horizontal displacement of the gas pressure transmission lever.

8a and 8b is a state in which the gas pressure transfer lever is displaced in the horizontal direction by the arc gas pressure in the circuit breaker for wiring according to the present invention (b) and the gas pressure shooter in the vertical direction by the gas pressure transfer lever (c) and the It is an operation explanatory drawing which shows the state (d) in which a trip bar rotates in order to trip a mechanism part by the vertical displacement of a gas pressure shooter. Referring to these drawings will be described the operation of the circuit breaker with a pressure trip device according to the present invention.

When an accident current such as a short-circuit current flows on a circuit in which a circuit breaker according to the present invention flows, as shown in FIG. 6, a contact between the fixed contact 11 and the movable contact 10 inside the single pole breaking unit 2 is shown. An arc occurs due to the opening (also called the current-limiting action) by the interelectron repulsive force. At this time, the arc gas by the arc is the pressure plate 15a of the gas pressure transmission lever 15 assembled inside the pressure trip device 12 through the exhaust port 2a of the single pole blocking unit 2 as shown in FIG. 7. This causes the gas pressure transmission lever 15 to move in the horizontal direction, whereby the first inclined surface 15b of the gas pressure transmission lever 15 obliques the second inclined surface 14a of the gas pressure shooter 14 by the inclination angle. As a result, the pressure component acts on the gas pressure shooter 14 as much as the cosine value of the inclination angle of the second inclined surface 14a of the gas pressure shooter 14 is multiplied by the horizontal movement power of the gas pressure transmission lever 15. Thus, the gas pressure shooter 14 is raised upward. 8, the inclined surface of the tip end (upper end) of the gas pressure shooter 14 contacts one end of the trip bar 4 to rotate the trip bar 4 in a pressurized and clockwise direction, The opening and closing mechanism restrained by the trip bar 4 is operated in a trip state (for example, the latch is released to open the movable contact from the fixed contact using the stored elastic energy of the opening and closing spring).

As described above, when the fault current flows in the circuit breaker according to the present invention, the momentary current is momentarily activated by the electromagnetic repulsive force between the contacts attached to the movable contactor 10 and the fixed contactor 11 assembled inside the single-pole breaking unit 2. The contactor 10 and the fixed contactor 11 may be opened. However, such a surge may cause re-contact of the contact when the duration of the electromagnetic repulsive force is interrupted or weakened, so that the contact and the circuit breaker are required by the reliable trip operation. According to the present invention, the gas pressure transfer lever 15 and the gas pressure shooter 14 in which the arc gas pressure generated by the momentary current-limiting operation are assembled inside the pressure trip unit 12 installed on one side of the single-pole breaking unit 2. Are sequentially driven and the trip bar 4 is rotated by pressing the pressure trip shooter 14 to trip the circuit breaker to firmly block the circuit.

Although the present invention described above has been described with reference to one embodiment, the present invention is not limited thereto, and the present invention may be easily modified by those skilled in the art. It is obvious that it belongs to the technical idea of the.

As described above, according to the circuit breaker with a pressure trip device according to the present invention, the contact between the contacts attached to the movable contactor 10 and the fixed contactor 11 assembled inside the single-pole breaking unit 2, respectively. The generated arc gas pressure drives the pressure trip unit 12 installed on one side of the single-pole blocking unit 2, and the support member 13, the gas pressure transmission lever 15, and the gas pressure shooter 14 of the pressure trip unit 12. By tripping the trip bar (4) by the linkage operation of the wire), the circuit breaker immediately trips, so that the opening / closing mechanism is tripped faster than the conventional tripping process through the multi-step mechanism, which shortens the time for the arc to stay in the opening / closing mechanism. As a result, the performance of the circuit breaker can be improved, and the welding phenomenon due to contact recontact due to the trip time delay can be prevented.

Claims (3)

In the circuit breaker for wiring, A phase opening and closing mechanism including a movable contactor and a fixed contactor for opening and closing a current circuit for each phase, 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, wherein at least one of the phase single pole blocking units is provided with an arc gas exhaust port formed at a position of the arc extinguishing portion of one surface of the case; 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 includes sidewalls supporting the main circuit opening and closing mechanism on both sides, and a trip bar for tripping the main circuit opening and closing mechanism. and; It is provided at the opposite end portion of the pressure plate to convert the horizontal power obtained from the pressure plate portion to the vertical power and the pressure plate portion receiving the arc gas pressure exhausted and positioned opposite to the arc gas exhaust port to obtain the power to move horizontally A gas pressure transmission lever having a first inclined surface; A second inclined surface corresponding to the first inclined surface of the gas pressure transmission lever and having a second inclined surface for converting the horizontal power of the gas pressure transmission lever into a vertical power, and pressurizing the trip bar or pressing the trip bar; A gas pressure shooter installed to be movable in a vertical direction to a position for releasing the gas, and converting the horizontal power from the gas pressure transmission lever horizontally moving when the arc is generated into vertical power and moving upward to pressurize and rotate the trip bar; And a support member having an inner support wall portion for supporting and guiding the gas pressure transfer lever and the gas pressure shooter. According to claim 1, wherein the inner support wall of the support member: And a pair of protruding wall portions for guiding the gas pressure shooter to be moved up and down in a vertical straight line when the support member is vertically moved up and down in association with a horizontal movement of the gas pressure transmission lever. breaker. The method of claim 1, And the support member further includes a horizontal movement limiting wall portion having an inclined surface for limiting horizontal movement of the gas pressure transmission lever.

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