KR20130133555A - Arc-extinguishing device in air circuit breaker - Google Patents

Abstract

The present invention realizes an arc-extinguishing device for an air circuit breaker, including multiple grids with a first cut unit open towards a driving contact maker of an air circuit breaker; a side plate on which the multiple grids are fixed; a supporting unit, on which a first outlet are formed to discharge gas upwards, connected to the side plate; and an arc runner on which a second cut unit is formed, wherein the second cut unit is overlapped with the first cut unit to form a second outlet discharging gas to the side, thereby further extinguishing arcs, which take place when power is cut out, and increasing the safety of the extinguishing process.

Description

Arc-extinguishing device in Air Circuit Breaker}

The present invention relates to an apparatus for extinguishing an arc of a circuit breaker.

The air circuit breaker is a device that protects the circuit and the load by automatically cutting off the circuit in the event of an electrical overload or short circuit. In general, the electric current flowing through an electric circuit is divided into an electric current and an abnormal current flowing when a short circuit or ground fault occurs. The breaker is designed to be able to block both the lightning current and the abnormal current because it is difficult to block because the abnormal current is much larger than the lightning current.

The power system consists of various devices such as generators, transformers, and transmission lines. To stop some of them, the generator or transmission line must be shut off and disconnected from the power system. In addition, if a fault such as a short circuit or ground occurs in the power system, a large abnormal current flows. If it is left as it is, damage to the damaged part is increased and the remaining part may be broken by a large current. Therefore, in this case, the air circuit breaker is used.

FIG. 1 is an exploded perspective view of a fire protection device of the air circuit breaker of Korean Patent No. 945346, and FIG. 2 is a side cross-sectional view of the air circuit breaker having the arc protection device of Korean Patent No.

The arc extinguishing device 10 of the air circuit breaker of Korean Patent No. 945346 includes a plurality of grids 11, first and second chamber members 12a and 12b, a blocking part 13, an insulating plate 14, a filter 15, And an exhaust cover 16 and a first arc runner 17. The grid 11 is a plate-like body which divides, cools and extinguishes an arc generated at the time of current interruption. The first and second chamber members 12a and 12b have grooves for fixing the stacked grids 11 on the side surfaces thereof, and are coupled to each other to form gas outlets on the upper surfaces thereof. The blocking unit 13 is provided in the sawtooth shape in the gas discharge port to block the space between the grid (11). The first arc runner 17 is a plate for inducing an arc.

The air circuit breaker 20 further includes an approximately fixed contactor 21, a movable contactor 22, a second arcer 23, and a rotating shaft 24 together with the above-described extinguishing device 10.

1 and 2, the arc arcing process will be described. When an abnormal current is generated in the air circuit breaker, the movable contactor 22 rotates about the rotating shaft 24 and is opened from the fixed contactor 21. At this time, an arc is generated between the contact of the fixed contactor 21 and the movable contactor 22. The generated arc is guided to the grid 11 by the first and second arc runners 17 and 23. The induced arc is divided and cooled by the grid 11. At this time, a part of the grid 11 is melted by the high temperature arc and the pressure is increased. The heated arc gas and hot melt metal fugitive, which is scattered, move to the upper outlet. Arc gas is suppressed by the blocking part 13, the insulating plate 14, and the filter 15, and the scattering direction and scattering range of the scattering products are also controlled.

The arc extinguishing device 10 provided with such a conventional air circuit breaker has a problem in that arcing is not properly performed as the arcing time is generated to the outside of the grid 11 and the extinguishing time becomes longer.

KR945346 10

The present invention was created to solve the above problems, and aims to improve arc extinguishing performance and safety by concentrating the arc around the grid.

On the other hand, an object of the present invention is to increase arc extinguishing performance by elongating an arc and releasing arc gas more smoothly.

As an embodiment of the present invention, a plurality of grids having a first cutout open toward the movable contactor of the air circuit breaker; Side plates for fixing the grid; And a top plate having a first discharge port for discharging gas upwardly and coupled to the side plate. And an arc runner fixed to the support and having a second cutout, wherein the second cutout overlaps the first cutout at intervals to form a second discharge port for releasing gas to the side. The arc extinguishing device of the air circuit breaker may be provided.

On the other hand, the arc runner is an arc induction plate at least partially inclined toward the movable contact; And an emission plate extending from one end of the arc induction plate toward the top plate, stacked with the grid, and having a second cutout.

In this case, the second cutout may be formed in an open shape toward the first discharge port, or may be formed in a through hole shape.

In addition, the longitudinal width from the end of the first discharge port side of the discharge plate to the point where it meets the second cutout may be greater than or equal to 1/3 times the vertical width of the discharge plate and smaller than one time.

And as another embodiment of the present invention, it may further include a blocking means fixed to the side plate to prevent the arc generated during the opening of the movable contact to move toward the end of the movable contact side of the grid.

At this time, the blocking means is fixed to the side plate at the bottom of the grid; And a blocking plate provided between the movable contact side of the grid and the movable contact and extending obliquely upward from the fixed plate.

And an insulating plate provided at the first discharge port and having a distribution part for uniformly discharging the gas, wherein the distribution part is formed to face the arc runner side end of the insulating plate, and the area of the distribution part is 1/2 times the area of the insulating plate. It can be greater than or equal to and less than 1 times.

According to one embodiment of the present invention, since the arc is easily extended by the discharge port formed in the side and the gas is discharged to the side as well as the upper side, there is an effect of increasing the blocking performance and safety.

In addition, according to another embodiment of the present invention, the arc is blocked by the blocking means flowing into the outside of the grid is induced to the center of the grid has the effect of reducing the extinguishing time.

Further, according to another embodiment of the present invention, since the distribution part of the insulating plate is formed to be biased toward the arc runner side, the arc is evenly introduced into the plurality of grids, and gas is discharged to the upper side, thereby improving the extinguishing performance and safety.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be interpreted.
1 is an exploded perspective view of the arc extinguishing device of the air circuit breaker of Korean Patent No. 945346;
Figure 2 is a side cross-sectional view of the air circuit breaker with the extinguishing device of Figure 1,
Figure 3 is a front perspective view of the arc extinguishing device of the air circuit breaker according to a preferred embodiment of the present invention,
4 is a rear perspective view of the embodiment shown in FIG. 3;
5 is a rear view of the embodiment shown in FIG.
6 is a side cross-sectional view of the embodiment shown in FIG.
Figure 7 is an exploded perspective view of the embodiment shown in Figure 3,
8 is a perspective view of the grid of FIG.
9 is a perspective view of the support of FIG.
10 is a perspective view of the arc runner of FIG.
11 is a perspective view of the blocking means of FIG.
12 is a perspective view of the insulating plate of FIG.
FIG. 13 is a side sectional view of the air circuit breaker provided with the arc extinguishing device of the air circuit breaker shown in FIG.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

<Configuration and Function>

Figure 3 is a front perspective view of the arc extinguishing device of the air circuit breaker according to a preferred embodiment of the present invention, Figure 4 is a rear perspective view of the embodiment shown in Figure 3, Figure 5 is an embodiment shown in Figure 3 For the rear view. 6 is a side cross-sectional view of the embodiment shown in FIG. 3, and FIG. 7 is an exploded perspective view of the embodiment shown in FIG. 3.

3 to 7 will be described in detail the arc arcuating apparatus of the air circuit breaker according to a preferred embodiment of the present invention. The arc extinguishing device 1 of the air circuit breaker according to the preferred embodiment of the present invention includes a grid 100, a support part 200, an arc runner 300, a blocking means 400, an insulating plate 500, a filter 600 and An exhaust cover 700 is included.

8 is a perspective view of the grid of FIG. The grid 100 will be described in detail with reference to FIGS. 3 to 8.

The grid 100 is a metal plate, and the first cutout 110, the side end protrusions 120, and the top protrusion 130 are formed. The first cutout 110 is intended to facilitate the introduction and extension of the arc. The first cutout 110 has a substantially asymmetric Λ shape as shown. In addition, the peak portion of the first cutout 110 is further formed with grooves as shown to easily extend the induced arc. However, the shape of the first cutout 110 is not limited thereto, and may be any shape for easily expanding and extending the arc to the plurality of grids 100. As shown in FIG. 8, three side end protrusions 120 are formed at each side. The upper protrusion 130 is formed at the top of the grid 100. The side end protrusions 120 and the top protrusion 130 are not limited thereto, and the shape and number thereof may be changed to fix the grid 100 to the support part 200 to be described later.

9 is a perspective view of the support of FIG. 7. The support 200 will be described in detail with reference to FIGS. 3 to 9. The support 200 is provided to fix the grid 100 and to control the emission of arc gas and fly ash. The support part 200 includes side plates 210a and 210b and a top plate 220.

The side plates 210a and 210b are metal plates, and first insertion grooves 211a and 211b, second insertion grooves 212a and 212b, and third insertion grooves 213a and 213b are formed. The first insertion grooves 211a and 211b are formed in a rectangular shape as shown. However, the first insertion grooves 211a and 211b may have any shape in which the side end protrusion 120 and the insertion protrusion 312 of the arc runner 300 to be described later are inserted and fixed. The first insertion grooves 211a and 211b are formed in plural at regular intervals corresponding to the side end protrusions 120 described above so that the grid 100 is stacked. The second insertion grooves 212a and 212b are formed on the side plates 210a and 210b to couple the side plates 210a and 210b to the top plate 220. The second insertion grooves 212a and 212b may have a rectangular shape, and may have any shape corresponding to the fastening protrusion 222 formed on the upper plate 220. The third insertion grooves 213a and 213b are holes for fixing the blocking means 400 to the side plates 210a and 210b to be described later, and are formed at the lower ends of the side plates 210a and 210b as shown.

The upper plate 220 is coupled to the side plates 210a and 210b to support the grid 100. The upper plate 220 includes a first discharge port 221 and a fastening protrusion 222. The first discharge port 221 is a hole in which the arc gas is discharged and is formed in a square in the center of the upper plate 220. In addition, the height of the first discharge port 221 is slightly larger than the height of the upper protrusion 130 described above. In addition, a space for stacking the insulating plate 500 and the filter 600 to be described later is further formed on the first discharge opening 221.

FIG. 10 is a perspective view of the arc runner of FIG. 7. The arc runner 300 will be described in detail with reference to FIGS. 3 to 10. The arc runner 300 is a metal plate that guides the arc generated when the air circuit breaker operates to the grid 100 described above. The arc runner 300 includes a discharge plate 310 and the arc guide plate 320.

The discharge plate 310 is a plate constituting the body of the arc runner (300). The discharge plate 310 is formed with a second cutout 311 and the insertion protrusion 312. As shown in FIG. 10, the second cutout 311 has an approximately V shape having an upper end open and a lower end rounded. However, the shape of the second cutout 311 may be any shape that overlaps the above-described first cutout 110 such as the U-shaped or O-shaped to form the second discharge port 350 for gas discharge. In this case, the vertical width B of the second cutout 311 is greater than or equal to 1/3 times the vertical width A of the emission plate 310 and is determined in a range smaller than 1 times. If the vertical width B of the second cutout 311 is smaller than 1/3 of the vertical width A of the emission plate 310, gas induction through the emission plate 310 is not smoothly performed, leading to good arc induction. It doesn't work. As shown in FIG. 10, the vertical width B of the second cutout 311 is 3/4 times the vertical width A of the emission plate 310. However, when the second cutout 311 is formed in the form of a through hole, the width from the upper end of the discharge plate 310 to the lower end of the second cutout 311 becomes the vertical width B. Insertion protrusion 312 is provided for fixing the arc runner 300 to the side plates (210a, 210b) described above. The insertion protrusions 312 are formed in each of the three sides in the same shape as the side end projections 120 of the grid 100 described above. However, the shape and number of the insertion protrusions 312 may be appropriately changed to fix the arc runner 300 to the side plates 210a and 210b described above.

The arc guide plate 320 is a plate extending downward from the bottom of the discharge plate 310 inclined downward. The arc induction plate 320 is bent and extended at right angles to the discharge plate 310 as shown, is extended to be inclined downward about 45 degrees and bent horizontally again. The arc induction plate 320 may have any shape for easily inducing an arc generated between the fixed contactor and the movable contactor of the air circuit breaker, and is formed to include a surface inclined toward the movable contactor.

11 is a perspective view of the blocking means of FIG. Referring to Figures 3 to 11 will be described in detail the blocking means. The blocking means 400 includes a fixing plate 410 and a blocking plate 420. The fixing plate 410 is rectangular as shown as a plate for fixing the blocking means 400 to the side plates 210a and 210b described above. The fixing plate 410 is formed with two fastening holes 411 in which a fastening means such as a bolt is inserted. The blocking plate 420 is a plate extending from the fixing plate 410 to block the progress of the arc. The blocking plate 420 is concave bent toward the distal end of the first cutout 110 as shown in FIG. 3 or 7. However, the shape of the blocking plate 420 may be an inclined plate without being curved. The vertical width of the blocking plate 420 extends to a sufficient extent to cover the distal end of the first cutout 110, and the horizontal width extends to the arc guide plate 320 as shown in FIG. 6.

12 is a perspective view of the insulating plate of FIG. 7. An insulation plate will be described in detail with reference to FIGS. 3 to 12. The insulating plate 500 is a rectangular plate made of an insulating material, and a distribution part for uniformly dividing the gas is formed. As shown in FIG. 12, the distribution part includes a plurality of distribution holes 510. Such a distribution part is formed at the end of the arc runner 300 side as shown in FIG. If the distribution part is formed at the end portion opposite to the arc runner 300 side of the insulating plate 400, the arc may be discharged to the first discharge port 221 before the arc moves along the grid 100. The width of this distribution is greater than or equal to one half the width of the insulation plate and less than one time. In other words, the width E of the distribution portion is greater than or equal to half the width F of the insulating plate and less than one times. If the width of the distribution portion is smaller than 1/2 of the width of the insulating plate, the gas is not properly discharged through the first discharge port 221.

The filter 600 is a metal fabric filter for cooling the arc and filtering the metal molten by-products. Specifically, the filter 600 is formed by intersecting the metal yarns (wires) with each other as if to be taken over. As illustrated in FIG. 7, four filters 600 are stacked. At this time, the pores of each filter 600 may be formed to be the same, or the diameter of the pores located on the upper portion may be formed smaller.

The exhaust cover 700 is a plate for fixing the arc extinguishing device 1 of the air circuit breaker to the air circuit breaker. The exhaust cover 700 is formed with a plurality of exhaust holes for the gas passing through the first discharge port 221 to be discharged to the outside. In addition, the exhaust cover 700 is formed with a plurality of through holes necessary for fixing the arc extinguishing device 1 of the air circuit breaker to the air circuit breaker.

<Manufacturing Method>

Referring to Figures 3 to 12 will be described in detail the manufacturing method of the arc extinguishing device of the air circuit breaker according to a preferred embodiment of the present invention. The manufacturing method includes a grid 100 and an arc runner 300 fixing step, a blocking means 400 fixing step, an insulating plate 500 and a filter 600 laminated step, and a finishing step on the support part 200.

In the grid and arc runner fixing step, a plurality of grids 100 are stacked by first inserting an upper protrusion 130 formed on the grid 100 into the upper plate 220. In this case, the grids 100 are stacked in a manner that the shapes of the first cutouts 110 of the neighboring grids 100 are shifted from each other. Thereafter, the side end protrusion 110 of the grid 100 is inserted into the first insertion groove 211a of the side plate 210a, and the fastening protrusion 222 of the upper plate 220 is inserted into the second insertion groove 212a. . The insertion protrusion 312 of the arc runner 300 is inserted into the first insertion groove 211a of the side plate 210a. At this time, the arc guide plate 320 is fixed to the first cutout 110 and the discharge plate 310 to be the rear of the arc arc device (1). In addition, the discharge plate 310 and the grid 100 facing it is fixed to be spaced apart as shown in FIG. Accordingly, as shown in FIGS. 4 and 5, the first cutout 110 and the second cutout 311 overlap with each other to form a second discharge port 350. Then, the other side end protrusions 120, the insertion protrusions 312, and the fastening protrusions 222 are respectively inserted into the first and second insertion grooves 211b and 212b formed in the other side plate 210b. After that, by pressing the fastening protrusion 222 protruding out of the second insertion grooves 212a and 212b, the side plates 210a and 210b and the top plate 220 are firmly fixed.

In the blocking means fixing step, the blocking means 400 is fixed to each of the side plates 210a and 210b, respectively. In detail, the fixing plate 410 is fixed to the lower portion of the first cutout 110 while the blocking plate 420 surrounds the end of the first cutout 110. At this time, the blocking means 400 is a fastening means such as a bolt is fixed through the fastening hole 411 and the third insertion groove (213a, 213b).

In the insulating plate and filter stacking step, the insulating plate 500 is first stacked on the first discharge opening 221. In this case, as shown in FIG. 6, the insulating plate 500 is disposed to be adjacent to the arc runner 300. Thereafter, the plurality of filters 600 are sequentially stacked on the insulating plate 500.

In the finishing step, the upper surface of the upper plate 200 in which the insulating plate 500 and the filter 600 are stacked is finished with the exhaust cover 700.

FIG. 13 is a side sectional view of the air circuit breaker provided with the arc extinguishing device of the air circuit breaker shown in FIG. 3 to 13 will be described in detail the operating state of the arc extinguishing device of the air circuit breaker according to a preferred embodiment of the present invention.

The air circuit breaker includes a fixed contactor 51, a movable contactor 52, a fixed contactor side arc runner 53, a rotating shaft 54, and an arc extinguishing device 1. When an abnormal current occurs, first, the movable contact 52 is opened with the fixed contact 51 while rotating about the rotating shaft 54. At this time, an arc occurs between the contact between the fixed contact 51 and the movable contact 52. The generated arc is guided to the grid 100 by the arc guide plate 320 to be divided and cooled. At this time, since the arc is blocked by the blocking means 400 is introduced into the outside of the grid 100, the extinguishing time is shortened. When a part of the grid 100 is melted by the high temperature arc guided to the center of the grid 100, the pressure rises and the arc gas moves to the first outlet 221 and the second outlet 350. do. At this time, the insulating plate 500 adds resistance to the movement of the arc gas so that the gas is also discharged to the second discharge port 350. Since the arc gas is discharged not only to the first discharge port 221 facing upwards, but also to the second discharge port 350 facing toward the side, rapid discharge of the gas is performed, and the extinguishing performance is improved. In addition, the arc is extended to the second discharge port 350 along the recesses of the first cutouts 110 arranged to be offset from each other so that the arc voltage is increased and the short circuit current is suppressed to increase the breaking performance and safety.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims, rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalents of the claims are to be construed as being included within the scope of the present invention do.

1: Arc extinguishing device of the air circuit breaker according to a preferred embodiment of the present invention
10: Air circuit breaker extinguishing device of Korea Patent 945346
11: grid 12a, 12b: first and second chamber members
13: breaker 14: insulation plate
15 filter 16 exhaust cover
17: first arc runner 20: crane breaker
21,51: fixed contactor 22,52: movable contactor
23: first and second arc runner 24,54: rotation axis
53: fixed contact side arc runner
100: grid 110: first incision
120: side projection 130: upper projection
200: support portion 210a, 210b: side plate
211a, 211b: first insertion groove 212a, 212b: second insertion groove
213a, 213b: third insertion groove 220: top plate
221: first outlet 222: fastening protrusion
300: arc runner 310: discharge plate
311: second incision 312: insertion protrusion
320: arc induction plate 350: second outlet
400: blocking means 410: fixed plate
411: fastener 420: blocking plate
500: insulation plate 510: distribution hole
600: filter 700: exhaust cover

Claims (7)

A plurality of grids having a first cutout opened toward the movable contactor of the air circuit breaker;
A side plate for fixing the grid; And a top plate having a first discharge port for discharging gas upwardly and coupled to the side plate. And
And an arc runner fixed to the support part and having a second cutout part formed therein.
And the second cutout overlaps the first cutout to form a second discharge port for releasing gas to the side. The method of claim 1,
The arc runner is
An arc induction plate at least partially inclined toward the movable contact; And
And an emission plate extending from one end of the arc induction plate toward the top plate and laminated with the grid, wherein the second cutout part is formed. 3. The method of claim 2,
The vertical width B from the end of the first discharge port side of the discharge plate to the point of contact with the second cutout is greater than or equal to 1/3 and less than 1 times the vertical width A of the discharge plate. Arc extinguishing device of the air circuit breaker, characterized in that. The method of claim 1,
The second cutout is arc arcuate protection device of the air circuit breaker, characterized in that open to the first outlet or formed in the form of through holes. The method of claim 1,
And a blocking means fixed to the side plate to prevent an arc generated when opening the movable contactor from moving toward the end of the movable contactor side of the grid. 6. The method of claim 5,
The blocking means
A fixed plate fixed to the side plate at the bottom of the grid; And
And a blocking plate provided between the end of the movable contact side and the movable contact of the grid and extending obliquely upward from the fixed plate. The method of claim 1,
An insulation plate provided at the first discharge port and having a distribution part for uniformly discharging gas;
The distribution part is formed to be biased to the arc runner side end portion of the insulating plate,
And the area of the distribution part is greater than or equal to 1/2 times the area of the insulating plate and less than 1 time.

Images