JP2020091939A - Gas circuit breaker - Google Patents

Abstract

To improve insulation resistance between electrodes by preventing hot gas from being directly exhausted to a high electric field part even if the hot gas is leaked from a gap between a fixed-side main contact and an insulation nozzle.SOLUTION: A gas circuit breaker comprises: a main contact constituted of a movable-side main contact and a fixed-side main contact which are disposed opposite inside of a gas tank so as to perform electrode opening and electrode closing operation; a pair of fixed-side and movable arc contacts for generating an arc by electrifying a current after separation of the main contact; a puffer cylinder coaxially provided in an outer periphery of the movable arc contact; a puffer chamber constituted of the puffer cylinder, a piston and a hollow rod; and an insulation nozzle forming a space communicating with the puffer chamber. The gas circuit breaker is characterized in providing a structure protruding in a radial direction oppositely to gas which is formed between the fixed-side main contact and the insulation nozzle, in an outer peripheral part of the insulation nozzle.SELECTED DRAWING: Figure 3

Description

The present invention relates to a gas circuit breaker, and more particularly to a gas circuit breaker suitable for extinguishing an arc generated between contacts by extinguishing an insulating gas during current interruption.

2. Description of the Related Art In recent years, high voltage and large current of power systems have been advanced, and the capacity of gas circuit breakers has been increased in order to obtain necessary breaking performance. Further, in order to reduce the cost, miniaturization is being promoted by optimizing the blocking section structure, the exhaust, and the shield structure.

A schematic structure of such a gas circuit breaker is shown in FIG.

As shown in FIG. 1, the gas circuit breaker is arranged in the movable arc contactor 2 on the operating device side (right side in FIG. 1) housed in a gas tank 1 filled with insulating gas, and on the opposite side. The fixed arc contactor 3 is electrically connected, and the movable main contact 5 and the fixed main contact 4 arranged on the opposite side are electrically connected (movable side). The main contact 5 and the fixed-side main contact 4 constitute a main contact).

Then, when an opening command is transmitted at the time of a power system short-circuit failure, the movable side is operated by the operating device via the hollow rod 6 and the insulating rod (not shown), and the fixed arc contactor 3 on the fixed side and the movable side on the movable side are moved. The arc contactor 2, the movable side main contactor 5, and the fixed side main contactor 4 move to a physically separated state.

Even after the movable side main contactor 5 and the fixed side main contactor 4 are separated from each other, a current flows between the fixed arc contactor 3 and the movable arc contactor 2 to generate an arc 30. The gas circuit breaker is for extinguishing the generated arc 30 by blowing high-pressure insulating gas, and when the movable side operation is performed, the inside of the puffer cylinder 8 coaxially provided on the outer periphery of the movable arc contactor 2 is moved. The moving puffer piston 7 compresses the insulating gas in the puffer chamber 9, and the compressed insulating gas is blown to the arc 30 through the insulating nozzle 10 that forms a space communicating with the puffer chamber 9, whereby the arc 30 Is extinguished. The puffer chamber 9 is composed of a puffer cylinder 8, a puffer piston 7, and a hollow rod 6.

The hot gas 31 generated when the insulating gas is sprayed from the insulating nozzle 10 to the arc 30 has a low density at a high temperature and a low dielectric strength. In order to prevent deterioration of the insulation performance between the electrodes (between the fixed-side main contact 4 and the shield 11 and the movable-side main contact 5), after the arc 30 is successfully extinguished, the hot gas 31 is discharged into the fixed-side exhaust stack. It is necessary to promptly discharge through 12.

The role of the fixed exhaust stack 12 is to quickly discharge the generated hot gas 31 without accumulating it between the electrodes (between the fixed arc contact 3 and the movable arc contact 2) and to efficiently discharge the hot gas 31. Is to cool to.

Next, the generation mechanism of the dielectric breakdown 32 that occurs between the fixed-side main contact 4 and the movable-side main contact 5 or between the shield 11 and the movable-side main contact 5 will be described with reference to FIG.

As shown in FIG. 2, the hot gas 31 generated between the fixed arc contactor 3 and the movable arc contactor 2 is discharged into the gas tank 1 while being cooled through the fixed side exhaust stack 12, but With the increase in capacity and miniaturization, the amount of hot gas 31 generated increases, while the exhaust capacity decreases.

Therefore, the risk of discharging the hot gas 31 between the electrodes (between the fixed-side main contact 4 and the shield 11 and the movable-side main contact 5) is high, and when a high voltage is applied after the current is cut off, Dielectric breakdown 32 may occur from the hot gas 31 as a starting point.

In addition, when the current is cut off, the insulating nozzle 10, the fixed arc contactor 3, and the movable arc contactor 2 are exposed to the high-temperature arc 30, so that a part (for example, the surface of the insulating nozzle 10 or the fixed arc contactor 3) is exposed. The tip) melts and is discharged into the gas tank 1 together with the hot gas 31.

The substances discharged together with the hot gas 31 are recombined during the cooling process, diffused in the gas tank 1 as decomposition products, and are deposited as deposits 33 on the outer peripheral surface of the insulating nozzle 10. The decomposition products deposited on the outer peripheral surface of the insulating nozzle 10 include metal foreign matters and the like. When the decomposition products are deposited on the outer peripheral surface of the insulating nozzle 10, the dielectric strength decreases and the insulating nozzle 10 May cause dielectric breakdown 32 on the surface of the.

To solve this problem, by providing a filter that collects the decomposition products in the gap formed between the tip of the insulating nozzle and the structure on the outer periphery of the insulating nozzle, the decomposition products are deposited on the insulator between the electrodes. Patent Document 1 describes a technique for preventing this.

In addition, a flange is provided at the tip of the insulating nozzle to maintain a narrow gap with respect to the structures arranged on the outer periphery of the nozzle, so that the amount of gas flowing between the electrodes can be suppressed and the gap between the electrodes due to hot gas can be reduced. A technique for suppressing dielectric breakdown is disclosed in Patent Document 2.

JP, 2017-91988, A JP, 2011-222247, A

As described above, in the conventional gas circuit breaker shown in FIG. 1, the high-pressure insulating gas compressed in the puffer chamber 9 is sprayed onto the arc 30 generated between the fixed arc contactor 3 and the movable arc contactor 2. The high-temperature hot gas 31 generated after being blown to the arc 30 is discharged from the insulating nozzle 10, the hot gas 31 is discharged into the fixed side exhaust cylinder 12, and is discharged to the fixed side exhaust cylinder 12. The hot gas 31 is mixed with the gas in the fixed side exhaust pipe 12, and is discharged into the gas tank 1 through the exhaust holes 18a of the fixed side conductor 18 while being cooled.

However, as shown in FIG. 2, the hot gas 31 generated by being blown to the arc 30 is generated between the fixed-side main contact 4 and the insulating nozzle 10 in addition to the exhaust holes 18 a of the fixed-side conductor 18. Since the gas leaks from the gap G, the hot gas 31 may be directly discharged to the high electric field portion between the electrodes, and the dielectric strength of the electrode and the insulating nozzle 10 may decrease.

In Patent Document 1 described above, the accumulation of decomposition products on the insulator (for example, an insulating nozzle) between the electrodes is prevented, and in Patent Document 2, the amount of gas flowing between the electrodes is suppressed, and between the electrodes by hot gas. Although it is possible to suppress the dielectric breakdown, in any of the patent documents, there is no countermeasure against the hot gas generated by being blown to the arc from leaking from the gap formed between the fixed side main contactor and the insulating nozzle. Since it is not done, the hot gas leaking from the gap between the fixed side main contactor and the insulating nozzle is directly discharged to the high electric field part between the electrodes, which lowers the dielectric strength of the electrode and the insulating nozzle. The challenges remain.

The present invention has been made in view of the above points, and an object of the present invention is to improve high temperature even if hot gas leaks from a gap formed between a fixed main contactor and an insulating nozzle or between a nozzle connecting portion and an insulating nozzle. An object of the present invention is to provide a gas circuit breaker capable of improving the dielectric strength between electrodes without being directly discharged to the electric field section.

In order to achieve the above object, the gas circuit breaker of the present invention has a main contact composed of a movable side main contactor and a fixed side main contactor, which are arranged to face each other in a gas tank so as to be capable of opening and closing. A pair of stationary and movable arc contacts that generate an arc by passing an electric current after the contacts are separated, a puffer cylinder coaxially provided on the outer circumference of the movable arc contact, the puffer cylinder, a piston, and a hollow. A gas circuit breaker comprising a puffer chamber constituted by a rod and an insulating nozzle forming a space communicating with the puffer chamber, wherein the fixed-side main contactor and the insulating member are provided on an outer peripheral portion of the insulating nozzle. It is characterized in that a structure protruding in the radial direction is provided so as to face a gap formed between the nozzles.

Further, the gas circuit breaker of the present invention, in order to achieve the above object, a main contact composed of a movable side main contactor and a fixed side main contactor that are arranged to face each other in the gas tank to enable opening and closing operations. A pair of fixed and movable arc contacts for passing an electric current to generate an arc after the main contact is opened, a puffer cylinder coaxially provided on the outer circumference of the movable arc contact, the puffer cylinder and a piston, A puffer chamber constituted by a hollow rod, an insulating nozzle that forms a space communicating with the puffer chamber, and a bidirectional drive mechanism that drives the fixed arc contact in a direction opposite to the drive direction of the movable arc contact. And a connecting rod connected to a nozzle connecting portion provided at the tip of the insulating nozzle, and the connecting rod and the fixed arc contactor are connected via a pin. A gas circuit breaker comprising a lever, the fixed arc contactor moving in a fixed side direction in accordance with the operation of the movable arc contactor during the breaking operation, and the nozzle connecting to the outer peripheral portion of the insulating nozzle. It is characterized in that a structure projecting in a radial direction is provided so as to face a gap formed between the portion and the insulating nozzle.

According to the present invention, even if hot gas leaks through the gap formed between the fixed-side main contactor and the insulating nozzle, it is not directly discharged to the high electric field portion, and the dielectric strength between the electrodes can be improved. ..

It is sectional drawing which shows schematic structure of the conventional gas circuit breaker. It is a fragmentary sectional view showing the schematic structure of the part between poles in the conventional gas circuit breaker. It is a fragmentary sectional view showing a schematic structure of a portion between electrodes in Example 1 of a gas circuit breaker of the present invention. It is a partial cross section figure which shows schematic structure of the inter-electrode part in Example 2 of the gas circuit breaker of this invention. It is a fragmentary sectional view showing the schematic structure of the part between electrodes in Example 3 of the gas circuit breaker of the present invention. It is sectional drawing which shows schematic structure of the twin drive type gas circuit breaker as Example 4 of the gas circuit breaker of this invention. It is a fragmentary sectional view showing the schematic structure of the part between poles in the conventional twin drive type gas circuit breaker. It is a partial cross section figure which shows schematic structure of the interelectrode part of the twin drive type gas circuit breaker in Example 4 of the gas circuit breaker of this invention. It is a partial cross section figure which shows schematic structure of the interelectrode part of the twin drive type gas circuit breaker in Example 5 of the gas circuit breaker of this invention.

Hereinafter, the gas circuit breaker of the present invention will be described based on the illustrated embodiments. In each embodiment described below, the same reference numerals are used for the same components.

Further, the following is merely an example of the embodiment, and is not intended to limit the content of the invention to the following specific embodiments. It goes without saying that the invention itself can be implemented in various modes as long as it complies with the contents described in the claims.

The gas circuit breaker of the present embodiment is similar to the conventional gas circuit breaker shown in FIG. 1, and is fixed on the side opposite to the movable arc contactor 2 on the operator side housed in the gas tank 1 filled with insulating gas. The arc contactor 3, the movable side main contactor 5 and the fixed side main contactor 4 are electrically connected, but when an opening command is transmitted at the time of a short circuit failure of the power system, the hollow rod 6 and the insulating rod are used. The movable side is operated by the operation device, and the fixed side fixed arc contactor 3 and the movable side movable arc contactor 2, and the movable side main contactor 5 and the fixed side main contactor 4 are physically separated. It is a transition.

Even after the movable side main contactor 5 and the fixed side main contactor 4 are separated from each other, a current flows between the fixed arc contactor 3 and the movable arc contactor 2 to generate an arc 30. The gas circuit breaker blows a high-pressure insulating gas to the generated arc 30 to extinguish the arc. When the movable side operation is performed, the insulating gas in the puffer chamber 9 is compressed by the puffer piston 7, and the compressed gas is compressed. The arc 30 is extinguished by spraying the arc 30 on the arc 30.

Further, as in FIG. 1, in the gas circuit breaker, the hollow rod 6 is connected to the operating device via the insulating rod, and the entire gas circuit breaker is arranged in the gas tank 1 filled with SF ₆ gas or the like. A fixed arc contactor 3 and a movable arc contactor 2, a puffer cylinder 8, a puffer chamber 8, a puffer cylinder 8, a puffer piston 7, a hollow rod 6 and an insulating nozzle 10, and a movable side main contact 5 and The fixed-side main contact 4, the fixed-side exhaust pipe 12, and the fixed-side conductor 18 are roughly configured.

The fixed side exhaust pipe 12 is electrically connected to the fixed arc contactor 3 through the support structure, and the movable side arc contactor 2, the hollow rod 6, the puffer piston 7, the puffer cylinder 8 and the movable part which are electrically connected. The side main contactors 5 are electrically connected to the fixed side in the energized state (closed state).

The above-mentioned puffer chamber 9 is arranged coaxially with the puffer cylinder 8 on the inner circumference of the puffer cylinder 8 and has a hollow interior, and the hollow rod 6 into which the insulating gas flows and the puffer cylinder 8. 8 is formed by a puffer piston 7 that slides in a space formed between the hollow rod 6 and the hollow rod 6. The puffer piston 7 is fixed to a mounting seat provided on the inner peripheral surface of the gas tank 1.

The pressure of the insulating gas blown to the arc 30 in the puffer chamber 9 is formed by the puffer cylinder 8 moving relative to the puffer piston 7. More specifically, the driving force of the operating device is transmitted to the puffer cylinder 8 from the insulating rod connected to the operating device (not shown) through the hollow rod 6, and the insulating gas in the puffer chamber 9 is compressed. It

The high-pressure insulating gas compressed in the puffer chamber 9 is blown onto the arc 30 generated between the fixed arc contactor 3 and the movable arc contactor 2. The high-temperature hot gas 31 generated after being blown onto the arc 30 is discharged from the insulating nozzle 10 and discharged into the fixed side exhaust pipe 12. The hot gas 31 discharged to the fixed side exhaust pipe 12 is mixed with the gas in the fixed side exhaust pipe 12 and discharged into the gas tank 1 through the exhaust holes 18a of the fixed side conductor 18 while being cooled.

As described above, as shown in FIG. 2, the hot gas 31 generated by being blown to the arc 30 is generated between the fixed main contactor 4 and the insulating nozzle 10 in addition to the exhaust holes 18a of the fixed conductor 18. It also leaks from the generated gap G.

Therefore, in this embodiment, as shown in FIG. 3, on the outer peripheral portion of the insulating nozzle 10, in the radial direction facing the gap G formed between the fixed main contactor 4 and the insulating nozzle 10 (the upper portion of FIG. 3). The structure 20 is provided so as to project in the direction).

The structure 20 has a disk shape, the outer diameter of which is less than or equal to the inner diameter of the fixed-side main contactor 4, and the fixed-side main contact from the center between the movable-side main contactor 5 and the fixed-side main contactor 4. It is arranged on the outer peripheral portion of the insulating nozzle 10 on the child 4 side. Further, the structure 20 is formed integrally with the insulating nozzle 10 and is made of the same material as that of the insulating nozzle 10 (the insulating nozzle 10 is a composite in which an inorganic filler is added to a resin having heat resistance lower than that of fluororesin). The material, for example, is formed of fluororesin mixed with boron nitride (BN) powder).

As in the present embodiment, by providing the structure 20 protruding radially in the outer peripheral portion of the insulating nozzle 10 so as to face the gap G formed between the fixed main contactor 4 and the insulating nozzle 10, As shown by the gas flow A1 in FIG. 3, the hot gas 31 leaking from G once collides with the structure 20 and is then discharged between the poles, so that the hot gas 31 reaches the movable-side main contact 5. It can be delayed, and the insulation performance can be improved by cooling by mixing with the room temperature gas between the electrodes.

A typical potential distribution in a gas circuit breaker is shown by a broken line in FIG.

As indicated by the broken line in FIG. 3, since the electric field becomes higher near the center of the pole due to the concentration of equipotential lines, the structure 20 is fixed side, that is, the insulating nozzle 10 on the fixed side main contactor 4 side. If it is arranged on the outer peripheral side, it is possible to prevent the hot gas from reaching the high electric field portion.

In addition, the structure 20 can increase the creepage distance of the outer peripheral portion of the insulating nozzle 10, and can also form a surface (side surface of the structure 20) on which the deposit 33 is less likely to deposit. Since the deterioration of the dielectric strength due to the deposition on the top is suppressed, the creeping dielectric strength can be improved.

With this embodiment, the hot gas 31 generated by being blown to the arc 30 when the current is cut off and leaking between the electrodes is provided on the outer peripheral portion of the insulating nozzle 10 so as to project in the radial direction. With 20, it is possible to circulate around the gap like the gas flow A1 and cool and discharge it, rather than directly between the gaps. As a result, the high temperature hot gas 31 does not directly reach the high electric field portion between the electrodes.

As a result, the temperature of the hot gas 31 when reaching the high electric field portion can be lowered by mixing with the gas between the electrodes, and the dielectric strength between the electrodes can be improved. Even when a decomposition product that causes a decrease in dielectric strength is deposited on the surface of the insulating nozzle 10, a gap G formed between the stationary main contact 4 and the insulating nozzle 10 in the outer peripheral portion of the insulating nozzle 10. By providing the structure 20 facing in the radial direction and protruding in the radial direction, it is possible to increase the creeping distance, and it is possible to improve the dielectric strength even when the dielectric strength decreases due to the volume of degradable organisms.

Therefore, according to the present embodiment, even if the hot gas 31 leaks from the gap G formed between the fixed main contactor 4 and the insulating nozzle 10, it is not directly discharged to the high electric field portion, and insulation between the electrodes is not provided. The yield strength can be improved.

Although SF ₆ was used as the insulating gas in the present embodiment, it goes without saying that the type of insulating gas is not limited to SF ₆ and other insulating gases such as dry air and nitrogen gas can be used.

Example 2 of the gas circuit breaker of this invention is shown in FIG.

In the present embodiment shown in FIG. 4, the structure 20 is provided on the outer peripheral portion of the insulating nozzle 10 described in the first embodiment so as to face the gap G formed between the fixed main contactor 4 and the insulating nozzle 10. In addition, the second structure 21 is arranged parallel to the structure 20 on the movable side main contact 5 side.

In addition, in the present embodiment, two of the structure 20 and the second structure 21 are arranged on the outer peripheral portion of the insulating nozzle 10, but the number of structures is not particularly limited, and a plurality may be arranged.

Further, the second structure 21 of the present embodiment has a disk shape similar to the structure 20 of the first embodiment, and its outer diameter is equal to or smaller than the inner diameter of the fixed-side main contactor 4 and is movable. It is arranged on the outer peripheral portion of the insulating nozzle 10 on the fixed side main contact 4 side with respect to the center between the side main contact 5 and the fixed side main contact 4. Further, the structure 20 is formed integrally with the insulating nozzle 10 and is made of the same material as the insulating nozzle 10.

With such a configuration of this embodiment, the same effect as that of the first embodiment can be obtained, and by providing the second structure 21, the creeping distance of the insulating nozzle 10 can be further extended. Further, it is possible to further improve the surface dielectric strength.

FIG. 5 shows Embodiment 3 of the gas circuit breaker of the present invention.

In Examples 1 and 2, by disposing the structure 20 and the second structure 21 that obstruct the gas flow on the outer peripheral portion of the insulating nozzle 10, it is possible to prevent the hot gas leaked between the electrodes from reaching the high electric field portion. By extending the creepage distance, the insulation performance between the poles is improved.

In the present embodiment shown in FIG. 5, the outer peripheral portion of the insulating nozzle 10 faces the gap G formed between the fixed-side main contact 4 and the insulating nozzle 10 and has a taper formed at the radial end portion to straighten the flow. The third structure 22 that acts is arranged.

The taper formed on the third structure 22 is inclined from the central axis side in the radial direction, that is, is inclined so as to expand from the fixed side main contactor 4 side toward the movable side main contactor 5 side. Is formed.

It should be noted that the third structure 22 of the present embodiment has a disk shape similar to the structure 20 of the first embodiment, and its outer diameter is equal to or smaller than the inner diameter of the fixed-side main contactor 4 and is movable. It is arranged on the outer peripheral portion of the insulating nozzle 10 on the fixed side main contact 4 side with respect to the center between the side main contact 5 and the fixed side main contact 4. Further, the structure 20 is formed integrally with the insulating nozzle 10 and is made of the same material as the insulating nozzle 10.

With such a configuration of this embodiment, the same effect as that of the first embodiment can be obtained and, of course, it is formed on the outer peripheral portion of the insulating nozzle 10 between the fixed main contactor 4 and the insulating nozzle 10. Since the third structure 22 having a taper is provided in the radial direction from the center axis so as to face the gap G, the gas flow of the hot gas 31 in the third structure 22 is arranged. By making A3 the direction of the gas tank 1 (radial direction in FIG. 5), it is possible to prevent gas from flowing into the high electric field portion.

FIG. 6 shows a schematic configuration of a twin drive type gas circuit breaker as Example 4 of the gas circuit breaker of the present invention.

Although the first to third embodiments described above are the examples of the single-drive type circuit breaker in which only the movable side operates, in this example, the fixed arc contactor 3 is the movable arcuate contactor 2 on the movable side. This is an example of application to a so-called twin drive type gas circuit breaker that is movable in the direction opposite to.

As shown in FIG. 6, the twin-drive type gas circuit breaker has a main contact composed of a movable side main contactor 5 and a fixed side main contactor 4 which are arranged to face each other in the gas tank 1 so as to be capable of opening and closing. A pair of fixed and movable arc contacts 3 and 2 for generating an arc by passing an electric current after the main contact is opened, a puffer cylinder 8 coaxially provided on the outer periphery of the movable arc contact 2, and a puffer. The puffer chamber 9 constituted by the cylinder 8, the puffer piston 7 and the hollow rod 6, the insulating nozzle 10 forming a space communicating with the puffer chamber 9, the fixed arc contact 3 and the driving direction of the movable arc contact 2. And a bidirectional drive mechanism portion that drives in the opposite directions.

The above-mentioned bidirectional drive mechanism unit connects the connecting rod 14 connected to the nozzle connecting unit 13 provided at the tip of the insulating nozzle 10, the connecting rod 14 and the fixed arc contactor 3 to the driven pin 16 and the driven side. It is composed of a lever 15 connected through a side pin 17, and the fixed arc contactor 3 moves in the fixed side direction in accordance with the operation of the movable arc contactor 2 during the breaking operation.

In Embodiments 1 to 3 described above, hot gas leaks from the gap G between the tip outer peripheral portion of the insulating nozzle 10 and the inner peripheral portion of the fixed-side main contactor 4. However, as shown in FIG. In the case of a circuit breaker, since the insulating nozzle 10 is made of an insulating material such as resin with respect to the nozzle connecting portion 13 and the connecting rod 14 made of a metal member, the nozzle connecting portion is caused by the stress applied during the breaking operation. A minute gap G may occur between the insulating nozzle 10 and the insulating nozzle 10.

For this reason, the hot gas 31 generated when sprayed on the arc may leak from the gap G, causing dielectric breakdown between the electrodes.

In view of this, in the present embodiment, as shown in FIG. 8, a structure 23 that protrudes radially in the outer peripheral portion of the insulating nozzle 10 so as to face the gap G formed between the nozzle connecting portion 13 and the insulating nozzle 10. Is provided.

According to this embodiment, the structure 23 is provided on the outer peripheral portion of the insulating nozzle 10 so as to radially protrude so as to face the gap G formed between the nozzle connecting portion 13 and the insulating nozzle 10. Since the hot gas 31 leaking from the gap G once collides with the structure 23 and is discharged between the gaps, it is possible to delay the arrival of the hot gas 31 at the movable-side main contactor 5, and thus the gap between the gaps is increased. Insulation performance can be improved by cooling by mixing with a room temperature gas.

The structure 23 of this embodiment is provided with the structure 20 and the second structure 21 arranged in the above-described second embodiment, or the third structure 22 having the rectifying function arranged in the third embodiment. As a result, the effects obtained in Examples 2 and 3 can be obtained, and the dielectric strength between the electrodes can be improved.

Further, the structure 23 of the present embodiment, like the structures of the first to third embodiments, has a disk shape, the outer diameter of which is less than or equal to the inner diameter of the fixed-side main contact 4, and the movable-side main contact. It is arranged on the outer peripheral portion of the insulating nozzle 10 on the side of the fixed-side main contact 4 with respect to the center between the contact 5 and the fixed-side main contact 4. Further, the structure 20 is formed integrally with the insulating nozzle 10 and is made of the same material as the insulating nozzle 10.

FIG. 9 shows a fifth embodiment of the gas circuit breaker of the present invention. Embodiment 5 shown in FIG. 9 is applied to the twin drive type gas circuit breaker of FIG.

As shown in FIG. 9, also in the present embodiment, the structure 23a is provided on the outer peripheral portion of the insulating nozzle 10 so as to protrude in the radial direction so as to face the gap G formed between the nozzle connecting portion 13 and the insulating nozzle 10. However, in the structure 23a in the present embodiment, a protrusion protruding toward the fixed-side main contact 4 side is integrally provided at the distal end portion in the radial direction.

Then, a space 34 is formed by the structure 23a integrally provided with the protrusion, the nozzle connecting portion 13 and the insulating nozzle 10, and the hot gas leaked from the gap G formed between the nozzle connecting portion 13 and the insulating nozzle 10. However, after it is folded back in the space 34, it is discharged between the electrodes.

According to the present embodiment having such a configuration, the same effect as that of the fourth embodiment can be obtained, and when the hot gas 31 leaks from the minute gap G formed between the nozzle connecting portion 14 and the insulating nozzle 10. Since the structure 23a has a structure in which it is folded back toward the fixed side by the protrusion protruding toward the fixed side main contactor 4, the hot gas 31 is composed of the nozzle connecting portion 14, the insulating nozzle 10 and the structure 23a. Since the air is returned in the space 34 and then discharged between the electrodes, it is possible to delay the discharge of hot gas into the electrodes.

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. For example, in each of the above-described embodiments, a puffer type gas circuit breaker that obtains a blowing gas pressure by mechanical compression of the puffer piston 7 is used as an example, but either or both of a fixed volume thermal expansion chamber and a mechanical compression chamber may be used. It can also be applied to a gas circuit breaker having a structure.

1... Gas tank, 2... Movable arc contactor, 3... Fixed arc contactor, 4... Fixed side main contactor, 5... Movable side main contactor, 6... Hollow rod, 7... Puffer piston, 8... Puffer cylinder, 9... Puffer chamber, 10... Insulation nozzle, 11... Shield, 12... Fixed side exhaust pipe, 13... Nozzle connecting part, 14... Connecting rod, 15... Lever, 16... Driving side pin, 17... Driven side pin, 18 ... Fixed-side conductor, 18a... Fixed-side conductor exhaust holes, 20, 23, 23a... Structure, 21... Second structure, 22... Third structure, 30... Arc, 31... Hot gas, 32... Dielectric breakdown, 33... Deposit, 34... Space.

Claims (12)

A main contact consisting of a movable side main contactor and a fixed side main contactor, which are arranged to face each other in the gas tank so as to be capable of opening and closing, and a pair of pairs of currents that flow after the main contact is opened to generate an arc. Fixed and movable arc contacts, a puffer cylinder coaxially provided on the outer circumference of the movable arc contact, a puffer chamber constituted by the puffer cylinder, a piston and a hollow rod, and a space communicating with the puffer chamber. A gas circuit breaker having an insulating nozzle forming
A gas circuit breaker, characterized in that a structure protruding radially is provided on an outer peripheral portion of the insulating nozzle so as to face a gap formed between the fixed-side main contactor and the insulating nozzle. A main contact consisting of a movable side main contactor and a fixed side main contactor, which are arranged to face each other in the gas tank so as to be capable of opening and closing, and a pair of pairs of currents that flow after the main contact is opened to generate an arc. A fixed and movable arc contactor, a puffer cylinder coaxially provided on the outer circumference of the movable arc contactor, a puffer chamber constituted by the puffer cylinder, a piston and a hollow rod, and a space communicating with the puffer chamber. An insulating nozzle to be formed and the fixed arc contactor, and a bidirectional drive mechanism unit for driving the movable arc contactor in a direction opposite to the driving direction,
The bidirectional drive mechanism unit includes a connecting rod connected to a nozzle connecting unit provided at the tip of the insulating nozzle, and a lever connecting the connecting rod and the fixed arc contactor via a pin. A gas circuit breaker in which the fixed arc contactor operates in the fixed side direction in accordance with the operation of the movable arc contactor during the breaking operation,
A gas circuit breaker, characterized in that a structure protruding radially is provided on an outer peripheral portion of the insulating nozzle so as to face a gap formed between the nozzle connecting portion and the insulating nozzle. The gas circuit breaker according to claim 1 or 2, wherein
The gas circuit breaker, wherein the structure is arranged at least on the outer peripheral portion of the insulating nozzle on the fixed main contact side with respect to the center between the main contacts. The gas circuit breaker according to any one of claims 1 to 3,
A plurality of the structures are arranged in an axial direction of an outer peripheral portion of the insulating nozzle, wherein the gas circuit breaker is characterized. The gas circuit breaker according to any one of claims 1 to 3,
A gas circuit breaker, wherein the structure has a taper formed at a radial end thereof. The gas circuit breaker according to claim 5,
The gas circuit breaker, wherein the taper is formed so as to be inclined in a radial direction from a central axis side. The gas circuit breaker according to claim 6,
The gas circuit breaker, wherein the taper is formed so as to be inclined so as to expand from the fixed-side main contact side toward the movable-side main contact side. The gas circuit breaker according to claim 2,
The gas breaker according to claim 1, wherein the structure is provided with a protrusion protruding toward the fixed side main contact side integrally with the structure at a radial end portion thereof. The gas circuit breaker according to claim 8,
A space is formed by the structure in which the protrusion is integrally provided, the nozzle connecting portion, and the insulating nozzle,
A gas circuit breaker characterized in that hot gas leaking from the gap generated between the nozzle connecting portion and the insulating nozzle is turned back in the space and then discharged between the electrodes. The gas circuit breaker according to any one of claims 1 to 9,
The gas circuit breaker, wherein the structure has a disk shape and an outer diameter thereof is equal to or smaller than an inner diameter of the fixed-side main contactor. The gas circuit breaker according to any one of claims 1 to 10,
The gas circuit breaker, wherein the structure is formed integrally with the insulating nozzle. The gas circuit breaker according to claim 11,
The gas circuit breaker, wherein the structure and the insulating nozzle are made of the same material.

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