KR20110037114A - Assist device to improve the dielectric strength of circuit braker - Google Patents

Abstract

PURPOSE: An auxiliary circuit breaker is provided to easily intercept current between tow arc contacts by surrounding a first arc contact when intercepting a fault current to block the flow of electrons. CONSTITUTION: An auxiliary circuit breaker includes an attractors(200), an insulating cover(100), and a guide bar(300). A first insulating cover is comprised of a first cover body and a first blade. The first cover body surrounds the outer circumference of one side of a first arc contact(1). The insulating cover is decided according to the first arc contact. The insulating cover is moved in horizontal direction and is ascended in oblique direction at the end of the first arc contact.

Description

Assist device to improve the dielectric strength of circuit braker

The present invention relates to a secondary circuit breaker for improving the insulation strength of the circuit breaker, and more particularly, to improve the breaking performance by increasing the insulation performance of the arc contact in the process of the existing circuit breaker to block the fault current and recover the insulation. It relates to an auxiliary blocking device.

In general, when a breakdown occurs in the power system, a circuit breaker is used to cut off the fault current and protect the power equipment.

The breaker normally delivers electricity while supplying rated current under normal conditions, and when a fault or accident occurs in the power system and a fault current that reaches about 10 times more than the normal current flows, the breaker uses a compression chamber and a thermal expansion chamber. Will be blocked.

Usually, the compression chamber of a breaker is used for breaking a small current, and a thermal expansion chamber is used for breaking a large current.

1 is a schematic block diagram showing a conventional circuit breaker structure.

As shown in FIG. 1, a conventional circuit breaker includes a first arc contact 1, a second arc contact 2, a first nozzle 4, a second nozzle 5, a cylinder rod 3, and a piston ( 7) and a check valve 6a mounted on the separating wall 6 separating the thermal expansion chamber 8 and the compression chamber 9 and a pressure reducing valve 7a provided on the piston 7.

When the breaker breaks down in the power system, when the breaker is a unidirectional breaker, all the portions except the first arc contact point 1 and the piston 7 (hereinafter referred to as moving parts) move from right to left with reference to FIG. 1. Thus, the gas in the compression chamber 9 is automatically compressed by the piston 7.

At this time, when the gas pressure of the compression chamber 9 is higher than the gas pressure of the thermal expansion chamber 8, the check valve 6a of the separation wall 6 is opened, and the gas compressed in the compression chamber 9 is the thermal expansion chamber ( 8) and the first nozzle 4 are injected between the first arc contact (1) and the second arc contact (2).

Then, as the movable part moves, the first arc contact 1 and the second arc contact 2 are separated and the contact is released, thereby generating an arc between the two arc contacts 1 and 2, and the two arc contacts 1 The arc generated between and 2) is extinguished by the compressed gas of the compression chamber 9 to block the fault current.

The interruption of the fault current is possible only when the fault current generated in the power system is small, and the injected gas expands due to an arc generated between the first arc contact point 1 and the second arc contact point 2 and expands thermally. This is possible only when no backflow into the yarn 8 occurs.

When the fault current to be interrupted is large, the arc energy generated between the first arc contact 1 and the second arc contact 2 becomes large so that the surrounding gas is expanded so that the gas flows back into the thermal expansion chamber 8.

At this time, the pressure of the thermal expansion chamber 8 is higher than that of the compression chamber 9 by the backflow gas, and the check valve 6a is closed by this.

The gas flowing back to the thermal expansion chamber 8 is cooled in the thermal expansion chamber 8 and injected into the arc between the first arc contact 1 and the second arc contact 2 again to extinguish the arc.

In this process, if the pressure in the compression chamber 9 is high, stress is applied to the manipulator (not shown), and mechanical pressure may be applied to the blocking part 10 itself, so that the pressure in the compression chamber 9 is constant (for example, For example, the pressure of the compression chamber 9 is adjusted by blowing the gas of the compression chamber 9 backward by opening the pressure reducing valve 7a of the piston 7 when the pressure exceeds 15 bar).

In other words, when the magnitude of the fault current is small, the arc current is blocked by the compressed gas in the compression chamber 9 to cut off the fault current. When the fault current is large, the first arc contact 1 and the second arc contact are Using the arc energy generated between (2), the surrounding gas is expanded to flow back to the thermal expansion chamber (8), and then flowed back to cool the compressed and compressed gas in the thermal expansion chamber (8) again to extinguish the arc and breakdown current To block.

However, the successful breaking of the fault current by the existing circuit breaker strictly blocks the fault current and withstands (blocks) the transient recovery voltage (TRV) applied between the poles (arc contacts) immediately after the fault current is blocked. ) It is the case that no current flows anymore.

That is, immediately after the breaker interrupts the fault current, a large transient recovery voltage is applied between the first arc contact 1 and the second arc contact 2 having a rapid rise rate determined by the circuit conditions of the system. In order to withstand voltage, a gas is blown between the first arc contact point 1 and the second arc contact point 2 to cool the gas, thereby increasing the gas density.

However, if the circuit breaker does not withstand such a transient recovery voltage, insulation breakdown occurs between the two arc contacts and a fault current flows again, causing the fault current to fail.

The present invention has been invented to solve the above problems, the existing circuit breaker wants an arc contact (first arc contact) is moved to the outside of the first nozzle to be separated from the second arc contact in the process of blocking the fault current The purpose of the present invention is to provide an auxiliary circuit breaker for improving the insulation strength of the circuit breaker to increase the breaking performance by not only facilitating the breaking of the fault current but also increasing the insulation strength for the insulation recovery.

In order to achieve the above object, the present invention, the drawer 200 is fixed to the end of the first nozzle (4); Insulation cover 100 is moved in conjunction with the movement of the drawer 200 to surround the first arc contact (1); It is configured to include; guide bar 300 for guiding the movement of the insulating cover 100,

When the fault current of the circuit breaker is interrupted, the auxiliary cover device is characterized in that the insulating cover 100 covers the first arc contact (1) as the first nozzle (4) is moved.

The auxiliary blocking device according to the present invention wraps the arc contact (first arc contact) on one side in the fault current blocking process of the existing circuit breaker, thereby interrupting the flow of electrons and facilitating current blocking between the two arc contacts, and the two arc contacts. With the release of, the insulation strength at the end of the arc contact with the highest field strength can be improved to cut off the transient recovery voltage applied immediately after the fault current is interrupted.

Accordingly, the fault current breaking performance of the existing circuit breaker can be significantly increased.

In addition, the auxiliary circuit breaker according to the present invention can be easily installed in the case of the existing one-way circuit breaker without modification or additional addition device, and can be easily configured, as well as a two-way circuit breaker that can be moved both arc contact as well as one-way circuit breaker. The same kind of circuit breaker can be applied at low cost and simple process.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as used in the singular and the plural unless the context clearly indicates otherwise.

There may be a plurality of embodiments of the present invention, and overlapping descriptions of the same parts as in the prior art may be omitted.

The present invention relates to an auxiliary circuit breaker that can improve the breaking performance by increasing the insulation performance of the arc contact in the process of breaking the fault current and recovering the insulation, the first arc contact during the fault current breaking operation of the breaker (1) is wrapped to facilitate current blocking and to increase insulation strength for insulation recovery.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, only the second arc contact 2 is moved and the first arc contact 1 is connected to the breaker. It is made of a structure installed in the one-way breaker is fixed to the fixing portion (not shown).

Figure 2 is a side cross-sectional view showing a circuit breaker with an auxiliary blocking device according to the present invention, Figure 3 is an exploded perspective view showing an embodiment of the auxiliary blocking device according to the present invention, Figure 4 is an auxiliary blocking device of Figure 3 Is a perspective view showing a state in which it is fixed and mounted to the first nozzle of the circuit breaker.

In addition, Figure 5a is a perspective view showing an embodiment of the insulating cover according to the present invention, Figure 5b is a perspective view and an internal sectional view showing a state in which the insulating cover according to the invention wrapped the first arc contact when a fault current occurs.

As shown in the illustrated embodiment, the auxiliary circuit breaker according to the present invention has a drag 200 which is fixed to an end of the first nozzle 4 of the circuit breaker so as to increase the insulation strength for insulation recovery when the circuit breaker is turned off. ), An insulating cover 100 which is interlocked with the movement of the dragger 200 to surround the first arc contact 1, and guide holes 311a and 321a for guiding the movement of the insulating cover 100. It may be configured to include a guide 300 formed.

In the auxiliary blocking device, when the fault current of the circuit breaker is blocked, the first nozzle 4 is moved to the left side with reference to FIG. ) Is moved to surround the first arc contact (1) to withstand the transient recovery voltage applied after the current interruption.

2 to 5, in the present invention, the insulating cover 100 includes a first insulating cover 110 covering the upper end of the first arc contact 1 and a lower end of the first arc contact 1. It is formed to cover the outer circumferential surface of the first arc contact (1) made of a second insulating cover 120 to cover the.

In detail, the first insulating cover 110 may include a first cover body 111 formed to cover an outer circumferential surface of one side of the first arc contact point 1, and a rear end portion of the first cover body 111. A first wing 113 protruding vertically upward is formed, and the second insulating cover 120 has a second cover body 121 formed to cover the outer peripheral surface of the other side of the first arc contact 1, and The second wing 123 protruding vertically downward from the rear end of the second cover body 121 is formed.

The insulating cover 100 is connected to the first blade 113 and the second blade 123 so that the insulating cover 100 can be interlocked and moved along the drawer 200. A first fastening hole 113a and a second fastening hole 123a through which the first interlocking member 141 and the second interlocking member 142 are respectively installed are formed.

In the present invention, the size of the insulating cover 100 is determined based on the first arc contact (1), preferably in order for the insulating cover 100 to completely wrap the first arc contact (1), The sum of the inner circumferences of the first insulating cover 110 and the second insulating cover 120 is greater than the outer circumference of the first arc contact 1.

For example, the inner circumference of the first insulating cover 110 and the second insulating cover 120 is formed to slightly exceed the center line of the first arc contact 1 (about 2mm or so), as shown in Figure 5b, the first insulation The radius of the cover 110 and the second insulating cover 120 is formed to be about 1 mm larger than the radius of the first arc contact (1), so that the electrons in the first arc contact (1) when a fault current or a transient recovery voltage occurs This makes it possible to more reliably stop reaching.

To this end, a stepped portion 115 is formed at an edge of the first cover body 111 to cover the edge of the second insulating cover 120, and the stepped portion 115 of the first insulating cover 110 is formed. The edges of the second insulating cover 120 and the overlapping allow.

6 is a perspective view showing an embodiment of a drag to move the insulating cover 100 when the fault current is blocked in the present invention.

In the present invention, the drawer 200 pulls or pushes the first drawer 210 and the second insulating cover 120 to pull or push the first insulating cover 110 in accordance with the movement of the first nozzle (4). It is composed of a second pawl 220.

As long as the first latch 210 and the second latch 220 are extended to the rear of the latch fixture (213, 223) fixed to the end of the first nozzle (4) of the circuit breaker, respectively, the latch anchor (213, 223) It consists of a pair of drag bodies 211 and 221, and an input hook 217 and 227 and a blocking hook 215 and 225 which are vertically deployed downwardly (or upwardly) at the rear ends of the dragger bodies 211 and 221.

Here, the closing hooks 217 and 227 are movable parts including the second arc contact point 2 when the breaker including the first nozzle 4 is closed for energizing rated current (the first arc contact point in FIG. 2). (1) and the remaining portion except the piston (7) is moved to the state as shown in Figure 2) by pushing the interlocking member 140 to rear the insulating cover 100 (first arc contact 1) Exposure direction), and the blocking hooks 215 and 225 push the interlocking member 140 when the fault current is interrupted so that the insulation cover 100 is moved forward (in the direction surrounding the first arc contact 1). Let it move

Figure 7 is a perspective view showing an embodiment of the guide bar to determine the movement path of the insulating cover according to the present invention.

The guide 300 is a second guide to guide the movement of the first guide band 310 and the second insulating cover 120, the first guide hole 311a is formed to guide the movement of the first insulating cover 110. The guide hole 321a is formed of a second guide band 320.

The first judo belt 310 has a pair of first judo bar bodies 311 having a first guide hole 311 a and a first judo bar coupled to a rear end of the first judo bar body 311. The second guide stand body 321 is formed of a fixed stand 313, the second guide stand 321a is also formed with a second guide hole 321a, respectively, and the rear end of the second guide stand body 321 It is made of a second induction bar fixture 323 coupled to, the guide bar fixtures (313,323) may be fixed to the fixed portion (not shown) of the circuit breaker to which the first arc contact (1) is fixed.

The first guide hole 311a and the second guide hole 321a may be moved along the outer circumferential surface of the first arc contact point 1, respectively, at the distal end portions of the first insulating cover 110 and the second insulating cover 120. The end portions of the guide holes 311a and 321a are tapered so that the first insulating cover 110 and the second insulating cover 120 can be gathered in the direction surrounding the first arc contact 1 when the fault current is interrupted. Is formed.

That is, the first guide hole 311a and the second guide hole 321a are along the outer circumferential surfaces of the first insulating cover 110 and the second section soft cover 120, and the guide bar fixing bars 313 and 323 (induction guide 300). It is formed to extend horizontally in the forward direction from the rear of the back), and is moved obliquely along the shape of the tip of the first arc contact (1) and is developed obliquely to surround the first arc contact (1).

Accordingly, the insulating cover 100 moves horizontally in a straight line along the longitudinal direction of the first arc contact point 1, and then moves up and down in an oblique direction at the distal end of the first arc contact point 1.

Hereinafter, the operating state of the embodiment according to the present invention configured as described above are as follows.

8 is a plan view sequentially showing the operating state of the auxiliary blocking device according to the present invention, Figure 8 (a) shows a stroke at the start of the linear movement of the insulating cover 100, (b) shows the stroke at the end of the linear movement of the insulating cover 100, Figure 8 (c) is a time during the process of covering the first arc contact (1) in which the insulating cover 100 is moved in an oblique direction 8 (d) shows the time point at which the stroke is completed because the insulating cover 100 completely covers the first arc contact 1.

As shown in FIG. 4, an interlocking member 140 penetrating the first wing 113 and the second wing 123 of the insulating cover 100 is disposed between the dragging bodies 211 and 221. Assembled through the guide holes (311a, 321a), the interlocking member 140 is located in the rear end of the guide holes (311a, 321a) is in contact with the insertion hook (217,227).

The assembling 200 mounted as described above starts to move to the left side according to the movement of the first nozzle 4 for blocking the fault current, but the insulating cover 100 is interlocking member 140 as shown in FIG. ) Is moved along the path of the guide holes (311a, 321a) after being pushed in contact with the blocking hooks (215, 225) of the dragger 200, as shown in (b) and (c) and (d) of FIG. It is moved to surround the first arc contact (1).

On the other hand, the process of inserting the circuit breaker for the energization of the rated current is made of the reverse process of Figure 8, wherein the insulating cover 100 is guide holes (311, 321a) by the insertion hooks (217, 227) of the drawer 200 It is operated along.

As described above, the insulating cover 100 is moved together with the interlocking member 140 which is moved by the drawer 200, the starting point of the movement of the insulating cover 100 to move the interlocking member 140 It can be set by the interval (L1, L3) between the input hanger (217,227) and the blocking hanger (215,225).

That is, the starting point of the movement of the insulation cover 100 may be delayed according to the intervals L1 and L3, and the stroke length L2 of the insulation cover 100 and the insulation cover according to the overall stroke length of the dragger 200. The intervals L1 and L3, which are the movement delay lengths of 100, may be determined.

In other words, if the total stroke length is L, L = L1 + L2 and L = L2 + L3 have a relationship, and the start point of the first insulation cover 110 is determined according to the length of L1, and the length of L3 is determined. The start point of the movement of the second insulating cover 120 is determined.

When L1 and L3 are the same, the moving point of the first insulating cover 110 and the second insulating cover 120 may be the same, but it is not necessarily the case. If necessary, the first insulating cover has a different length from L1 and L3. The moving point of the 110 and the second insulating cover 120 may be separately.

In addition, when L1 (or L3) is '0', the insulation cover 100 may be moved from the beginning with the operation of the circuit breaker, but in this case, the flow of gas flow through the first nozzle 4 may be prevented. Therefore, it is preferable to leave a margin of about 10 mm or more at the interval (the interval between the insertion hooks 217 and 227 and the blocking hooks 215 and 225).

Therefore, in order to prevent the flow of gas through the fourth nozzle (), the input hooks 217 and 227 and the blocking hooks 215 and 225 of the dragger 200 are spaced at a predetermined interval (L1 and L3 in FIG. 4). Spaced apart.

That is, in the present invention, a gap may be set between the input hooks 217 and 227 and the blocking hooks 215 and 225 as much as the delay time of the insulation cover 100 is delayed.

On the other hand, when the auxiliary blocking device according to the present invention is applied to the two-way breaker moving not only the second arc contact (2) but also the first arc contact (1), the latch anchors (213, 223) of the drag puller 200, the first arc By connecting and installing the contact 1 to the moving link means, the auxiliary blocking device according to the present invention can be easily applied.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all the various forms of embodiments that can be implemented without departing from the spirit.

1 is a schematic diagram showing a conventional circuit breaker structure

Figure 2 is a side cross-sectional view showing a breaker equipped with a secondary blocking device according to the invention

3 is an exploded perspective view showing an embodiment of the auxiliary blocking device according to the present invention;

4 is a perspective view illustrating a state in which the auxiliary blocking device of FIG. 3 is fixed and mounted to the first nozzle of the circuit breaker;

Figure 5a is a perspective view showing an embodiment of the insulating cover according to the present invention

5B is a perspective view and an internal sectional view showing a state in which the insulating cover according to the present invention wraps the first arc contact when a fault current occurs;

Figure 6 is a perspective view showing an embodiment of a drag for moving the insulating cover when the fault current cut in the present invention

Figure 7 is a perspective view showing an embodiment of the guide bar to determine the movement path of the insulating cover according to the present invention

8 is a plan view sequentially showing an operating state of the auxiliary blocking device according to the present invention;

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

100: insulation cover 110: first insulation cover

111: first cover body 113: first wing

113a: first fastening hole 115: stepped portion

120: second insulating cover 121: second cover body

123: second wing 123a: second fastening hole

140: interlocking member 141: first interlocking member

142: second interlocking member

200: drawer

210: first drag 211: first drag body

213: first latch hook 215: first blocking hook

217: first feed hanger 220: second drawer

221: second latch body 223: second latch body

225: second block hanger 227: second input hanger

300; Judo stand 310: First Judo

311: first guide band body 311a: first guide hole

313: 1st judo stationary station 320: 2nd judo unit

321: the second guide band body 321a: the second guide hole

323: 2nd Judo Station Lock

Claims (8)

A chisel 200 fixed to an end of the first nozzle 4; Insulation cover 100 is moved in conjunction with the movement of the drawer 200 to surround the first arc contact (1); Induction stand 300 to guide the movement of the insulating cover 100; It is configured to include, When the fault current of the circuit breaker is interrupted, the auxiliary shield device is characterized in that the insulating cover 100 covers the first arc contact (1) as the first nozzle (4) is moved. The method according to claim 1, The insulating cover 100, A first cover body 111 formed to cover the outer circumferential surface of the upper end of the first arc contact 1 and a first wing 113 protruding vertically from one end of the first cover body 111 are provided. A first insulating cover 110; The second cover body 121 is formed so as to surround the outer peripheral surface of the lower end of the first arc contact 1, and the second wing 123 is formed to protrude vertically from one end of the second cover body 121. A second insulating cover 120; Auxiliary blocker, characterized in that consisting of. The method according to claim 2, The first insulating cover 110 and the second insulating cover 120 are each formed to have an inner circumference larger than the half length of the outer circumference of the first arc contact 1, and the edge of the first cover body 111 An auxiliary blocking device, characterized in that the step portion 115 is formed to cover the edge of the second insulating cover (120). The method according to any one of claims 1 to 3, The dragger 200 is composed of a first drag 210 to move the first insulating cover 110 and a second drag 220 to move the second insulating cover 120, The first dragger 210 and the second dragger 220 are each of the dragging rods 213 and 223 fixed to the ends of the first nozzle 4, and a pair of dragging bodies extending from the dragging rods 213 and 223, respectively. 211,221, and the auxiliary blocking device comprising an input hook (217,227) and a blocking hook (215,225) extending in the vertical direction from the other end of the drag body (211,221). The method according to claim 4, The blocking hooks 215 and 225 move the interlocking member 140 installed through the blades of the insulating cover 100 when the fault current is blocked, and the closing hooks 217 and 227 are interlocking members 140 when the rated current is energized. A secondary blocking device, characterized in that to be moved. The method according to any one of claims 1 to 3, The guide 300 is composed of a first induction guide 310 to guide the movement of the first insulating cover 110, the second induction guide 320 to guide the movement of the second insulating cover 120 , The first guide hole 310 is formed with a first guide hole (311a) for guiding the movement of the first interlocking member 141 through the first blade 113 of the first insulating cover 110, In the second judo 320, a second guide hole 321a for guiding the movement of the second interlocking member 142 through the second blade 123 of the second insulating cover 120 is formed Blocking device. The method according to claim 6, The first guide hole 311a and the second guide hole 321a may be moved along the outer circumferential surface of the first arc contact point 1 at the distal ends of the first insulation cover 110 and the second insulation cover 120, respectively. When the fault current is interrupted, the auxiliary insulating device, characterized in that the first insulating cover 110 and the second insulating cover 120 can be gathered in the direction surrounding the first arc contact (1). The method according to claim 4, The input hanging hooks 217 and 227 and the blocking hooks 215 and 225 are spaced apart from each other, and the starting point of the movement of the insulating cover 100 is set by the interval between the input hanging hooks 217 and 227 and the blocking hooks 215 and 225. Auxiliary breaker.

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