KR101040592B1 - Hybrid extinction type gas circuit breaker - Google Patents

Abstract

PURPOSE: A hybrid-extinction type gas circuit breaker is provided to block efficiently fault current by separating a heated gas of a heat expansion room from an arc area and discharging the heat gas of the arc area to an outside of a nozzle. CONSTITUTION: A partition(121) is extended from a piston(120) to a fixing arc contact(130) to surround an outer circumference of a cylinder rod(110) and includes a cooling gas discharge hole(121a) for discharging a cooling gas of a compression room(B). One or more cooling gas inflow hole(111) is formed at the cylinder rod to receive the cooling gas through the cooling gas discharge hole. When the fixing arc contact is separated from a nozzle neck(153) and the heated gas is discharged to an outside of a nozzle(150), a heated gas outlet(151) of a heat expansion room(A) is closed by the separation to prevent the discharge of the heated gas from the heat expansion room.

Description

Hybrid extinction type gas circuit breaker

The present invention relates to a complex extinguishing type gas circuit breaker, and more particularly, to a gas circuit breaker for effectively breaking and efficiently breaking fault current.

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

The gas circuit breaker is provided with a breaker that can be classified into a compression type, a thermal expansion type, a rotary arc type, and a combined extinguishing type of a combination of these extinguishing methods according to the method of extinguishing the fault current.

Among them, the complex extinguishing type breaker is a breaker that reduces the operating force of the operating device by utilizing the heat gas heated by the electric arc in the fault current blocking process. When a fault or accident occurs and a fault current that reaches about 20 times more than normal current flows, it blocks the fault current.

1 is a schematic diagram illustrating a blocker of a conventional SOHO gas circuit breaker.

As shown, the conventional gas circuit breaker has a thermal expansion chamber 17 in which a gas is expanded by a heat gas generated by a fault current to increase the pressure, and a cold gas required for blocking while breaking the fault current. Compression chamber 18 is compressed and the check valve 16 is operated by the pressure difference between the thermal expansion chamber 17 and the compression chamber 18 is provided.

When such a conventional gas circuit breaker blocks a small current, since the arc energy generated by the fault current is small, the expansion pressure of the thermal gas generated in the thermal expansion chamber 17 is relatively small.

Therefore, the pressure of the cold gas compressed in the compression chamber 18 is always greater than the pressure of the thermal expansion chamber 17 so that the check valve 16 is opened, and the cold gas (compressed gas) compressed in the compression chamber 18 is The gas of the thermal expansion chamber 17 is pushed into the arc region between the two arc contacts (movable arc contact 14 and fixed arc contact 13) to perform the blocking.

In the case of interrupting a large current, since the arc energy due to the fault current is very large, the insulation gas is heated and expanded by the arc to generate heat gas, and the generated heat gas flows backward to increase the pressure in the thermal expansion chamber 17. Let's do it.

When the pressure in the thermal expansion chamber 17 is greater than the pressure of the compressed gas produced in the compression chamber 18, the check valve 16 is closed and the compressed gas in the compression chamber 18 passes through the thermal expansion chamber 17. Prevent leakage into the arc area between the contacts.

Then, the heat gas flowing back to the thermal expansion chamber 17 is cooled by itself in the thermal expansion chamber 17, and when the fixed arc contact is out of the nozzle 15, specifically, the nozzle neck 15a, The hot gas is blown out by the expanded gas pressure to extinguish the arc.

In addition, when the pressure of the thermal expansion chamber 17 becomes lower than the compression chamber 18 as the heat gas is released from the blocking portion, the check valve 16 opens and the cold gas of the compression chamber 18 passes through the thermal expansion chamber 17 to the arc contact point. As it is supplied to the area of, the fault current is blocked.

In the case of the existing complex extinguishing type breaker, the small current interruption is not a problem, but in the case of breaking a large current, in order to block the fault current more efficiently, the heat gas in the arc region (hereinafter referred to as the 'arc region') between the two arc contacts is called. Must not exist.

However, in the existing composite extinguishing type breaker, since the reversed heat gas is continuously supplied by the pressure of the thermal expansion chamber 17, there is a problem in that the failure current breaking performance is deteriorated.

In other words, at the time when the fault current is interrupted (the time when the fixed arc contact point 14 is removed from the nozzle 15), the compressed gas generated in the compression chamber 18 discharges the heat gas in the thermal expansion chamber 17 out of the blocking portion. There is a structural problem of providing cold gas to the arc area while pushing out.

The present invention has been invented to solve the above problems, the cold gas of the compression chamber is supplied directly to the arc region without passing through the thermal expansion chamber, and at the same time the thermal gas of the thermal expansion chamber at the time when the failure current is interrupted arc region It is an object of the present invention to provide a complex extinguishing gas circuit breaker which can efficiently block the fault current by separating from and ejecting the hot gas present in the arc region out of the nozzle.

It is also an object of the present invention to provide a complex extinguishing type gas circuit breaker which reduces the operating force and stress of the manipulator by using the hot gas to pressurize the cold gas in the compression chamber.

In order to achieve the above object, the present invention provides a complex extinguishing gas circuit breaker for supplying compressed cold gas to an arc generated by separating a fixed arc contact point and a movable arc contact point as a cylinder rod is moved toward a piston.

A partition wall extending from the piston to the fixed arc contact side to surround the outer circumferential surface of the cylinder rod and having at least one cold gas discharge hole through which cold gas of the compression chamber is discharged;

At least one cold gas inlet hole through which the cold gas discharged through the cold gas discharge hole is introduced is formed in the cylinder rod.

When the fixed arc contact exits the nozzle neck and the hot gas starts to be discharged to the outside of the nozzle, the separation wall closes the hot gas entry hole of the thermal expansion chamber to prevent the discharge of the hot gas introduced into the thermal expansion chamber. A composite extinguishing gas circuit breaker is provided.

Preferably, when the pressure of the thermal expansion chamber is increased and greater than the pressure of the compression chamber, the compression chamber is provided with a sliding plate that is pushed and moved by the pressure difference and pressurizes the cold gas of the compression chamber.

In the complex extinguishing type gas circuit breaker according to the present invention, when the fixed arc contact exits the nozzle neck and the fault current can be blocked, the heat gas present in the thermal expansion chamber is separated from the arc region, and in this state, the cold gas of the compression chamber is The gas is pushed out of the nozzle a small amount of hot gas present in the arc area and the blocking of the fault current can be obtained an efficient blocking effect.

In addition, the pressure of the thermal expansion chamber is increased than the compression chamber by the heat gas until the thermal expansion chamber and the arc region are separated, so that the sliding plate is moved in the direction of pressurizing the cold gas of the compression chamber, thereby successfully blocking the operation force of the manipulator. This can greatly contribute to reducing the operating force of the manipulator.

1 is a schematic block diagram showing a blocker of a conventional SO-type gas circuit breaker
Figure 2 is a schematic block diagram showing an embodiment of a composite extinguishing gas circuit breaker according to the present invention
Figure 3 is a partial perspective view showing a moving state of the movable portion including the cylinder rod in the complex extinguishing gas circuit breaker according to the present invention
4A to 4D are cross-sectional views showing an operating state for breaking a large current of the complex extinguishing gas circuit breaker according to the present invention.
5a to 5d is a cross-sectional view showing an operating state for the small current blocking of the complex extinguishing type gas circuit breaker according to the present invention

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.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The composite extinguishing gas circuit breaker according to the present invention allows the cold gas of the compression chamber B to be directly supplied to the arc region without passing through the thermal expansion chamber A when the fault current is cut off, and at the same time, the thermal expansion in which the heat gas flows backward. By separating the seal A from the arc region, a small amount of heat gas remaining in the arc region is blown out of the nozzle 150 and arc extinguished to effectively interrupt the fault current.

To this end, as shown in FIG. 2, in the embodiment of the present invention, the cold gas inlet hole 111 may allow the cold gas compressed in the compression chamber B to flow into the cylinder rod 110. It is provided with one or more along the circumferential direction of (110).

In the present invention, the cold gas of the compression chamber (B) is directly supplied to the arc region through the cold gas inlet hole 111 to extinguish the arc.

In addition, the piston 120 illustrated on the right side of FIG. 2 is provided with a separation wall 121 extending to the left side.

In general, when the fault current is blocked, the fixed arc contact 130 exits the nozzle 150 to block, and at this time, heat gas should not remain in the arc region for efficient blocking.

Therefore, the present invention constitutes the dividing wall 121 to prevent the thermal gas from leaking in the thermal expansion chamber A and continuously being supplied to the arc region.

The separation wall 121 is formed to extend from the piston 120 to the fixed arc contact point 130 to surround the outer circumferential surface of the cylinder rod 110, and the cold gas discharged from the compression chamber B is discharged. The discharge hole 121a is provided.

The dividing wall 121 is formed in a shape corresponding to the outer circumferential surface of the cylinder rod 110, the cylinder rod 110 of the present invention is configured in a hollow cylindrical shape, as shown in Figure 3, the cold gas At least one discharge hole 121a is disposed on an outer circumferential surface of the dividing wall 121.

In addition, the cold gas inlet hole 111 of the cylinder rod 110 is disposed to correspond to the position of the cold gas discharge hole 121a to facilitate the inflow of the cold gas discharged through the cold gas discharge hole 121a. The cold gas inlet hole 111 moves in the moving direction of the cylinder rod 110 so that the cold gas of the compression chamber B can be supplied to the arc region regardless of the movement of the cylinder rod 110. It is formed to elongate.

In addition, as shown in Figure 3, in the embodiment of the present invention, the cylinder rod 110 is assembled in a structure that is partially inserted into the inside of the separation wall 121, the cold gas inlet hole 111 and cold gas Discharge holes 121a are arranged one by one in the up and down position with reference to FIG.

In the embodiment of the present invention, the cold gas discharge hole 121a is disposed at a portion where the piston 120 and the separation wall 121 are connected, and the cold gas inlet hole 111 is a cylinder as illustrated in FIGS. 4A to 4D. Before the rod 110 is moved (at normal current energization), the cold gas discharge hole 121a is positioned at one end of the cold gas inlet hole 111, and the cylinder rod 110 is completely moved (when the fault current is blocked). The gas discharge hole 121a is positioned at the other end of the cold gas inlet hole 111.

In addition, the separation wall 121 is preferably moved in close contact with the inner wall surface of the thermal expansion chamber A in order to reliably separate the heat gas of the thermal expansion chamber A from the arc region.

4A to 5D, when the fault current is interrupted, the remaining parts (cylinder rod 110 and nozzle 150) except for the fixed part of the piston 120, the separating wall 121, and the fixed arc contact 130, As the movable arc contact point 140 and the cylinder 170), that is, the movable part is moved to the right side, the cold gas of the compression chamber B is compressed and discharged through the cold gas discharge hole 121a, thereby allowing the cold gas inlet hole. It is introduced into the cylinder rod 110 through the 111 and is directly supplied to the arc region.

At this time, since the heat gas of the thermal expansion chamber (A) is isolated by the separating wall 121 and does not leak into the arc region, only a small amount of the thermal gas remaining in the arc region may be blown out of the nozzle 150. Heat gas is discharged out of the nozzle 150 only through the cold gas of the compression chamber B without the pressure of) and cuts off the fault current.

Thus, by blocking the heat gas continuously leaking from the thermal expansion chamber (A) through the separation wall 121, the blocking of the fault current is efficiently performed.

The heat gas heated by the arc enters and exits the thermal expansion chamber A through the heat gas entry hole 151 between the nozzle 150 and the movable arc contact 140, and the separation wall 121 enters the heat gas entry and exit. The hole 151 is closed to separate the thermal gas of the thermal expansion chamber A from the arc region.

Therefore, in the present invention, through the above structure, the compressed gas (cold gas) generated in the compression chamber (B) when the fault current is blocked does not pass through the thermal expansion chamber (A), but directly arcs arc arcing, Compression by separating the thermal gas of the thermal expansion chamber (A) from the arc region at the time point at which the cutoff is made (the fixed arc contact point 130 exits the nozzle neck 153 and the heat gas is discharged out of the nozzle 150). Only a small amount of hot gas present in the arc region with the cold gas of the chamber (B) is separated from the blocking portion to enable efficient blocking.

On the other hand, the inside of the compression chamber (B) is provided with a sliding plate 160 which is moved by the gas pressure of the thermal expansion chamber (A).

In the embodiment of the present invention, the sliding plate 160 has a circular ring shape with a center penetrated therein, such that the pressure of the thermal expansion chamber A in which the gas expands by the heat gas is higher than the pressure of the compression chamber B. When the pressure of the compression chamber (B) by reducing the volume of the cold gas generated in the compression chamber (B) serves to press.

To this end, a communication hole 171a for discharging the expanded gas of the thermal expansion chamber A is provided in the fixed wall 171 provided between the thermal expansion chamber A and the compression chamber B to distinguish these areas. Is formed, and the gas discharged through the communication hole 171a is moved by pushing the sliding plate 160 to reduce the volume of the compression chamber B and pressurize the cold gas.

The sliding plate 160 is assembled in a structure penetrated by the cylinder rod 110 and the separating wall 121, the inner wall surface of the cylinder 170 and the separating wall 121 (inner wall surface of the compression chamber (B)). Are kept confidential.

As described above, the present invention uses the hot gas generated by the fault current to pressurize the cold gas compressed in the compression chamber B at the same time, and at the time of interruption of the fault current, the hot gas is separated from the arc region to prevent the fault current. Maximize blocking performance.

Hereinafter, the operating state of the embodiment according to the present invention will be described in detail.

First, a case where a large current with a large fault current is cut off will be described.

4A illustrates an initial state before the gas circuit breaker operates, and the fixed arc contact 130 and the movable arc contact 140 contact each other to enable energization of a normal current.

When the normal current is energized and a fault occurs in the power system, a fault current is generated. As shown in FIG. 4B, the movable part including the cylinder rod 110 moves to the right side (the fixed piston 120 side), and the two arc contact points are moved. It separates and an arc occurs between them.

In the case of a large current interruption, since the arc energy is large, the insulating gas is heated by the arc, and the heated hot gas raises the pressure in the thermal expansion chamber A.

When the pressure in the elevated thermal expansion chamber (A) becomes greater than the pressure in the compression chamber (B), the sliding plate 160 is pushed toward the compression chamber (B) side to reduce the volume of the compression chamber (B) to reduce the compression chamber (B). ) Further pressurizes the cold gas compressed in

The compression chamber B reduced by the sliding plate 160 makes it possible to generate a pressure larger than the pressure generated in the compression chamber B when the fault current is a small current. In other words, it is possible to further pressurize the pressure of the cold gas generated in the compression chamber (B).

Then, as shown in FIG. 4C, the sliding plate 160 is gradually pushed to the right due to the gas pressure of the thermal expansion chamber A inflated by the heat gas, and the cold gas of the compression chamber B is pressurized, and the fixed arc contact point ( When the 130 passes through the nozzle neck 153 and the breakdown current can be blocked, the heat gas entry hole 151 is closed by the separating wall 121 and the heat gas in the thermal expansion chamber A It can be separated and the fault current can be effectively blocked.

In other words, as the movable part including the cylinder rod 110 is moved to the right side, the separating wall 121, which is not fixed, moves to the left side of the thermal expansion chamber A to block the thermal expansion chamber A. The thermal gas introduced into the thermal expansion chamber (A) is separated from the arc region, and the thermal gas of the thermal expansion chamber (A) is isolated together with the sliding plate (160).

4d illustrates a state in which a fault current is interrupted while cold gas compressed in the compression chamber B and pressurized by the gas pressure of the thermal expansion chamber A is supplied to the hot gas existing between two arc contacts. Since the heat gas of the thermal expansion chamber (A) is isolated by the separating wall 121 and the sliding plate 160, it does not leak into the arc area while the fault current is blocked, and does not have any effect on the interruption of the fault current. .

As the heat gas of the thermal expansion chamber (A) is cooled by itself after the failure of the fault current and the pressure of the thermal expansion chamber (A) is reduced, the sliding plate (160) has a position when the normal current is energized (fixed wall ( 171).

As described above, the present invention can efficiently shut off a small amount of hot gas remaining in the arc region by only a small amount of cold gas compressed in the compression chamber B, out of the nozzle 150.

On the other hand, in the case of a small current interruption with a small fault current, the interruption is performed using an increase in pressure generated by the action of the compression chamber B in the same manner as the conventional method.

Specifically, when a failure or an accident occurs in the power system while the normal current is energized as shown in FIG. 5A, the breaker operates and the movable part including the cylinder rod 110 moves to the right as shown in FIG. 5B. The arc contact 130 and the movable arc contact 140 are separated and an arc is generated.

At this time, since the arc energy generated is relatively small, the pressure of the thermal expansion chamber (A) is always smaller than the compression chamber (B), and thus the sliding plate 160 cannot be moved as shown in FIGS. 5C and 5D.

Accordingly, the cold gas compressed in the compression chamber B without being pressurized by the sliding plate 160 is supplied to the arc region to discharge a small amount of hot gas out of the nozzle 150 and to extinguish the arc.

At this time, since the heat gas of the thermal expansion chamber (A) is separated from the arc region by the dividing wall 121, only a small amount of cold gas is supplied to the arc region, and efficient blocking is possible.

As described above, the present invention relates to a complex extinguishing type gas circuit breaker for efficiently using thermal gas generated by an arc to interrupt a fault current. While passing through the thermal expansion chamber and the thermal gas of the thermal expansion chamber out of the nozzle and has a structure to block by arc extinguishment, the composite extinguishing type breaker of the gas circuit breaker according to the present invention is a compression chamber ( The compressed gas of B) is directly supplied to the arc region without passing through the thermal expansion chamber (A) to push the hot gas out of the nozzle (150), and isolate the thermal gas in the thermal expansion chamber (A) efficiently when the fault current is blocked. However, it is utilized to pressurize the cold gas in the compression chamber (B) until the hot gas is separated from the arc region, thereby reducing the operating force of the manipulator and maximizing the blocking performance.

While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to these embodiments, and those of ordinary skill in the art to which the invention pertains within the scope of the claims. It includes all embodiments of various forms that can be practiced.

110: cylinder rod
111: cold gas inlet hole
120: piston
121: dividing wall
121a: Cold gas discharge hole
130: fixed arc contact
140: movable arc contact
150: nozzle
151: heat gas entry hole
153: nozzle neck
160: sliding plate
170: cylinder
171: fixed wall
171a: Communication Hall

Claims (3)

As the cylinder rod 110 is moved toward the piston 120, the fixed arc contact point 130 and the movable arc contact point 140 are separated into a complex extinguishing gas circuit breaker to supply the compressed cold gas to the arc generated by the arc. In
One or more cold gas discharge holes 121a extending from the piston 120 to the fixed arc contact point 130 to surround the outer circumferential surface of the cylinder rod 110 and for discharging the cold gas of the compression chamber B are provided. The partition wall 121 is provided,
The cylinder rod 110 has at least one cold gas inlet hole 111 through which the cold gas discharged through the cold gas discharge hole 121a is introduced,
When the fixed arc contact 130 exits the nozzle neck 153 and the heat gas starts to be discharged to the outside of the nozzle 150, the separation wall 121 is a heat gas entry hole 151 of the thermal expansion chamber A. And) to prevent the discharge of the heat gas introduced into the thermal expansion chamber (A).
The method according to claim 1,
When the pressure in the thermal expansion chamber (A) rises and becomes greater than the pressure in the compression chamber (B), the sliding plate (160) pressurized by the pressure difference and pressurizes the cold gas of the compression chamber (B) is the compression chamber ( B-type gas circuit breaker, characterized in that configured in B).
The method according to claim 1,
Composite reflux type gas circuit breaker, characterized in that the cold gas inlet hole 111 is formed extending in the moving direction of the cylinder rod (110).

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