JP2020126801A - Puffer type gas circuit breaker - Google Patents

Abstract

To prevent interfering with operation of an insulated nozzle, make it less likely to be damaged, prevent high-temperature, high-pressure gas from flowing around the insulating nozzle, and prevent a backflow of an arc-extinguishing gas around a main contactor of a stationary side main contactor or a drive side main contactor.SOLUTION: A puffer type gas circuit breaker includes: an insulating nozzle 1, installed on a driving-side main contactor 4, for causing an arc-extinguishing gas to flow when a stationary-side arc contactor 5 and a driving-side arc contactor 6 separate from each other and extinguishing arc discharge by blowing the arc-extinguishing gas between the fixed side arc contactor 5 and the driving side arc contactor 6; and a guide 2 for installing a stationary-side main contactor 3 and the stationary-side arc contactor 5 at a position facing the driving-side main contactor 4 and the driving-side arc contactor 6. The insulating nozzle 1 includes a thin-walled part 10 that contacts the guide when it is open.SELECTED DRAWING: Figure 1

Description

The present invention relates to a puffer type gas circuit breaker.

Power circuit breakers are installed in key points of current circuits that make up various power transmission networks, such as power plants, substations, and household switchboards, and are used to conduct current in the current circuits and interrupt current during lightning strikes and accidents. Is a device that does.

Then, the power breaker conducts current from the upstream side to the downstream side of the power transmission network during normal operation (current conduction). On the other hand, the power circuit breaker shuts off the current circuit when a large current flows in the current circuit due to a short-circuit current due to a lightning strike or an accident, and prevents a lightning strike and the spread of the accident upstream of the power transmission network. .. In this way, the power circuit breaker is a protective device that helps the early restoration of the power transmission network that requires a long time for restoration.

In particular, for high-voltage circuits (current circuits) upstream of power transmission networks such as power plants and substations, inside the tank filled with insulating arc-extinguishing gas, for example, sulfur hexafluoride gas. The mainstream is a gas circuit breaker that includes a breaker. Since the gas circuit breaker has a circuit breaker inside the tank as compared with the air circuit breaker, it is possible to save labor for maintenance against environmental corrosion such as salt damage. Further, the gas circuit breaker disconnects one of the arc electrodes of the opposing breaker, which is energized during normal operation, by the operation of the linear motion mechanism of the breaker to interrupt the energization of current.

Then, the gas circuit breaker blows an arc-extinguishing gas on the arc discharge generated between the arc electrodes to extinguish the arc discharge at the time of disconnection. An operating device using hydraulic pressure or a spring is used as a drive source of the direct-acting mechanism of the shutoff portion. The method of spraying the arc-extinguishing gas on the arc discharge includes a mechanical puffer method, a thermal puffer method, or a combination thereof.

2. Description of the Related Art In recent years, gas circuit breakers have become smaller and more sophisticated, and gas circuit breakers of the same rating tend to be smaller in size. The smaller the gas circuit breaker, the smaller the cross-sectional area of the exhaust gas flow passage for the arc-extinguishing gas.

Normally, in a gas circuit breaker, the arc-extinguishing gas blown to the arc discharge flows from the puffer chamber to the inside of the insulating nozzle, and the arc-extinguishing gas increases in temperature and pressure due to the arc discharge, from the downstream side of the insulating nozzle. Exhausted. However, when the cross-sectional area of the exhaust gas flow path for arc-extinguishing gas becomes smaller due to the downsizing of the gas circuit breaker, high-temperature, high-pressure arc-extinguishing gas accumulates, circulates around the insulating nozzle, and the main contact (fixed side main contact and There is a possibility that it will flow around the drive side main contactor and destroy the insulation of the main contactor.

Japanese Patent Application Laid-Open No. 2004-119290 (Patent Document 1) is a background art of this technical field. In this patent document 1, a main contact including a fixed contact and a movable contact, an arc contact including a fixed contact and a movable contact that generates an arc by transferring a current when the main contact is opened, and a movable contact of the main contact. , A substantially cylindrical nozzle composed of an insulator that introduces an arc-extinguishing gas when the arc contacts are opened and sprays the arc between the arc contacts to extinguish the arc, and the fixed contact and arc of the main contact. In a gas circuit breaker provided with a conductive structural member having a substantially cylindrical inner surface provided at a position where the fixed contact of the contact faces each movable contact, in a gas circuit breaker, the nozzle at the downstream end of the nozzle is always made of a conductive structural member. A contact means (O-ring) that is configured to have a size and shape that slides while maintaining a small gap with the inner surface and that holds an electrical connection with the conductive structural member is provided on the outer peripheral surface of the downstream end of the nozzle. It is described (see summary).

JP 2004-119290 A

In the gas circuit breaker described in Patent Document 1, an O-ring is installed in the gap between the downstream end of the nozzle and the conductive structural member, and the O-ring contacts the conductive structural member, It is intended to prevent backflow of arc-extinguishing gas and prevent deterioration of insulation performance.

However, in the gas circuit breaker described in Patent Document 1, the O-ring may be damaged by heat of the arc extinguishing gas. Even when the O-ring is sealed and heat of the arc-extinguishing gas is prevented, partial displacement may occur due to misalignment between the center of the drive shaft of the nozzle and the center of the conductive structure member, which may cause damage. There is a nature.

Therefore, the present invention prevents the insulating nozzle from hampering the operation of the insulating nozzle, is less likely to be damaged, and prevents the high-temperature, high-pressure arc-extinguishing gas from wrapping around the insulating nozzle. A puffer-type gas circuit breaker for preventing backflow of arc-extinguishing gas is provided around the main contact of the.

In order to solve the above problems, a puffer type gas circuit breaker of the present invention includes a fixed side main contactor, a drive side main contactor capable of contacting and separating from the fixed side main contactor, a fixed side main contactor and a drive side main contactor. When the contact is separated from the contact, the fixed side arc contactor that transfers the current flow to generate the arc discharge, the drive side arc contactor that can be contacted and separated from the fixed side arc contactor, and the drive side main contactor The arc-extinguishing gas is flowed when the fixed-side arc contactor and the drive-side arc contactor are separated from each other, and the arc-extinguishing gas is sprayed between the fixed-side arc contactor and the drive-side arc contactor. An insulating nozzle having an insulating nozzle for extinguishing arc discharge, and a guide for installing the fixed-side main contactor and the fixed-side arc contactor at positions facing the driving-side main contactor and the driving-side arc contactor, respectively. In addition, it is characterized in that it has a thin-walled part that comes into contact with the guide in the open state.

According to the present invention, the operation of the insulating nozzle is not hindered, the insulating nozzle is less likely to be damaged, the high-temperature, high-pressure arc-extinguishing gas is prevented from wrapping around the insulating nozzle, and the fixed-side main contactor and the drive-side main contactor are provided. It is possible to provide a puffer-type gas circuit breaker that prevents backflow of arc-extinguishing gas around the main contact of the.

The problems, configurations and effects other than those described above will be clarified by the following description of the embodiments.

3 is a schematic view showing a cross section of the gas circuit breaker described in Example 1 in a closed state. FIG. 3 is a schematic view showing a cross section of the gas circuit breaker described in Example 1 in an open circuit state. FIG. 5 is a schematic view showing a cross section of a gas circuit breaker described in Example 2 in a closed state. FIG. It is a schematic diagram which shows the cross section of the closed state of the gas circuit breaker described in Example 3. It is a schematic diagram which shows the cross section of the closed state of the gas circuit breaker described in Example 4.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same or similar configurations are denoted by the same reference numerals, and when the description is duplicated, the description may be omitted.

FIG. 1 is a schematic diagram showing a cross section of the gas circuit breaker described in the first embodiment in a closed state.

The puffer type gas circuit breaker (hereinafter, may be simply referred to as “gas circuit breaker”) described in the present embodiment includes an insulating nozzle 1 and a conductive structural member (hereinafter, may be referred to as “guide”) 2. , Fixed side main contact 3, fixed side main contact 3 and drive side main contact 4 which can be contacted and separated, and when these main contacts (fixed side main contact 3 and drive side main contact 4) are separated It has a fixed-side arc contactor 5 that transfers an electric current and generates an arc discharge, and a fixed-side arc contactor 5 and a drive-side arc contactor 6 that can be brought into contact with and separated from the fixed-side arc contactor 5, and these are concentric cylinders whose central axes 8 coincide. Arranged in a shape.

The insulating nozzle 1 is installed in the drive side main contactor 4, and when the fixed side arc contactor 5 and the drive side arc contactor 6 are separated from each other, an arc extinguishing gas is caused to flow inside thereof and these arc contactors are An arc-extinguishing gas is blown in between to extinguish the arc discharge, and it is made of an insulating material and has a substantially cylindrical shape.

Further, the guide 2 is installed at a position where the fixed-side main contactor 3 and the fixed-side arc contactor 5 face the drive-side main contactor 4 and the drive-side arc contactor 6, respectively, and the inner surface has a substantially cylindrical shape. It is composed of a conductive structural member.

Then, in contact with the insulating nozzle 1 (on the right side in the drawing), a puffer chamber 7 that constitutes a puffer chamber for boosting the arc-extinguishing gas is installed.

Since the arc extinguishing gas flows from the puffer chamber 7 into the insulating nozzle 1, the buffer chamber 7 side of the insulating nozzle 1 is referred to as the upstream side, and the opposite side is referred to as the downstream side.

Since the gas circuit breaker shown in FIG. 1 shows a closed state, the fixed-side main contactor 3 and the drive-side main contactor 4 are in contact with each other, and current flows through the contact surface. Similarly, the fixed arc contact 5 and the drive arc contact 6 are also in contact.

The insulating nozzle 1 is installed so as to be sandwiched between the main contactor and the arc contactor so as to electrically insulate the both. Although not shown here, the fixed main contact 3, the guide 2, and the fixed arc contact 5 are electrically connected.

In addition, the insulating nozzle 1, together with the drive side main contactor 4 and the drive side arc contactor 6, operate in parallel with the central axis 8 in the upstream direction of the insulating nozzle 1 in the open state by an operating mechanism (not shown). .. Further, when shifting from the open state to the closed state, the operation is performed in the downstream direction in parallel with the central axis 8.

In the gas circuit breaker described in the present embodiment, the thin-walled component 10 is formed especially on the downstream end portion of the insulating nozzle 1.

In the present embodiment, the thin-walled component 10 spreads to the outer peripheral side due to the pressure of the arc extinguishing gas and comes into contact with the guide 2 when the closed state is changed to the open state. This suppresses the high-temperature, high-pressure arc-extinguishing gas from flowing around the insulating nozzle 1, and prevents the arc-extinguishing gas from flowing back around the main contacts of the fixed-side main contactor 3 and the drive-side main contactor 4. be able to.

The thin-walled component 10 described in the present embodiment is formed in an arcuate shape at the downstream tip portion of the insulating nozzle 1 so as to project downstream. In the closed state, there is a slight gap between the tip of the thin-walled component 10 and the guide 2. Then, when the closed state is changed to the open state, the thin-walled component 10 spreads to the outer peripheral side due to the pressure of the arc extinguishing gas, and the tip of the thin-walled component 10 contacts the guide 2.

By forming the thin-walled component 10 so as to project to the downstream side, it is possible to efficiently prevent the backflow of the arc-extinguishing gas. Further, by forming the thin-walled component 10 on an arc, it is possible to efficiently prevent backflow of the arc-extinguishing gas and reduce the contact area between the tip of the thin-walled component 10 and the guide 2. Friction between the tip of 10 and the guide 2 can be reduced.

In addition, the thin-walled component 10 is tapered from the root (the portion in contact with the insulating nozzle 1) toward the tip. As a result, the thin-walled component 10 efficiently spreads to the outer peripheral side due to the pressure of the arc extinguishing gas.

Furthermore, the root length 100 of the thin-walled component 10 is shorter than the circumferential length 101 of the tip portion of the insulating nozzle 1. Further, the rigidity of the thin-walled component 10 is smaller than the rigidity of the insulating nozzle 1. Then, the thin-walled component 10 spreads largely toward the outer peripheral side with respect to the pressure of the arc extinguishing gas, as compared with the insulating nozzle 1.

In addition, the thin-walled component 10 has a convex shape in the upstream side, in the direction orthogonal to the axis (circumferential direction), in the vicinity of the tip portion on the downstream side of the insulating nozzle 1. The thin-walled component 10 is thinner than the insulating nozzle 1, does not contact the guide 2 in the closed state, and spreads to the outer peripheral side by the pressure of the arc-extinguishing gas in the open state to come into contact (close contact) with the guide 2. Moreover, the thin-walled component 10 is formed of the same heat-resistant resin as that of the insulating nozzle 1.

This suppresses the high-temperature and high-pressure arc-extinguishing gas from wrapping around the insulating nozzle 1 and ensures the reverse flow of the arc-extinguishing gas around the main contacts of the fixed-side main contactor 3 and the drive-side main contactor 4. It can be prevented, does not hinder the operation of the insulating nozzle 1, and does not damage the thin-walled component 10.

FIG. 2 is a schematic diagram illustrating a cross section of the gas circuit breaker described in the first embodiment in an open circuit state.

When transitioning from the closed state to the open state, the insulating nozzle 1, the drive side main contact 4, the drive side arc contact 6 and the like are moved in the upstream direction in parallel with the central axis 8 by an operating mechanism (not shown). Operate.

The drive-side main contactor 4 operates in a direction away from the fixed-side main contactor 3. Further, the driving side arc contactor 6 also operates in a direction away from the fixed side arc contactor 5.

The fixed-side main contactor 3 and the driving-side main contactor 4 are separated first, and the fixed-side arc contactor 5 and the driving-side arc contactor 6 remain in contact with each other. At this time, the electric current is switched so as to flow through the arc contactor side (the fixed side arc contactor 5 and the driving side arc contactor 6). Then, the fixed side arc contactor 5 and the driving side arc contactor 6 separate.

When a large current is flowing, even if the fixed-side arc contactor 5 and the driving-side arc contactor 6 are separated from each other, the current is not immediately interrupted and arc discharge occurs. In order to extinguish the arc discharge in a short time, the extinguished gas compressed from a puffer chamber (not shown here) is blown into the inside of the insulating nozzle 1. The extinguished arc gas is guided to the inside of the insulating nozzle 1 to extinguish the arc discharge generated between the fixed-side arc contact 5 and the driving-side arc contact 6. The arc-extinguishing gas that has extinguished the arc discharge flows along the inner side of the insulating nozzle 1 to the downstream side of the insulating nozzle 1.

Then, at this time, the pressure of the arc-extinguishing gas increases in the vicinity of the distal end portion on the downstream side of the insulating nozzle 1.

Due to the arc extinguishing gas having increased pressure, the thin-walled component 10 formed in the vicinity of the downstream end portion of the insulating nozzle 1 spreads to the outer peripheral side and contacts the guide 2. Then, the high-temperature, high-pressure arc-extinguishing gas is prevented from flowing around the downstream end portion of the insulating nozzle 1 and flowing back to the main contactor side (the fixed-side main contactor 3 and the drive-side main contactor). ..

At this time, the operation of the insulating nozzle 1 is almost completed. The thin-walled component 10 is preferably an elastic body and has a smooth shape. As a result, even if the insulating nozzle 1 is in operation, it does not hinder the operation of the insulating nozzle 1.

On the other hand, when the open state is closed, the arc extinguishing gas has already been exhausted, and the pressure of the arc extinguishing gas is reduced near the downstream tip of the insulating nozzle 1, so that the thin wall thickness is reduced. The component 10 returns to its original state, and a slight gap is created between the tip of the thin-walled component 10 and the guide 2. Therefore, even if the open state is changed to the closed state, the operation of the insulating nozzle 1 is not hindered.

The thin-walled component 10 may be integrally formed with the insulating nozzle 1, or may be separately formed and joined by, for example, screwing.

As described above, in the gas circuit breaker described in the present embodiment, when the closed state is changed to the open state, the tip of the thin-walled component 10 and the guide 2 are in close contact with each other, so that the high-temperature, high-pressure arc-extinguishing gas It is possible to prevent the insulating nozzle 1 from wrapping around, prevent backflow of arc-extinguishing gas around the main contacts of the fixed-side main contactor 3 and the drive-side main contactor 4, and from the open state to the closed state. Even when the transition is made, the operation of the insulating nozzle 1 is not hindered and the thin-walled component 10 is not damaged.

As described above, the gas circuit breaker described in the present embodiment drives the fixed-side main contactor 3, the drive-side main contactor 4 that can be brought into contact with and separated from the fixed-side main contactor 3, and the fixed-side main contactor 3. When the side main contactor 4 separates from each other, a fixed side arc contactor 5 that transfers an electric current to generate an arc discharge, and a driving side arc contactor 6 that can be contacted and separated from the fixed side arc contactor 5. When the stationary arc contactor 5 and the driving arc contactor 6 are installed on the driving side main contactor 4, the arc-extinguishing gas is caused to flow, and the stationary side arc contactor 5 and the driving side arc contactor 6 are provided. Arc extinguishing gas to extinguish the arc discharge, and drives the substantially cylindrical insulating nozzle 1 made of an insulator, the fixed side main contactor 3 and the fixed side arc contactor 5, respectively. The guide 2 is installed at a position facing the side main contactor 4 and the driving side arc contactor 6 and has an inner surface formed of a conductive structural member and having a substantially cylindrical shape.

The gas circuit breaker described in the present embodiment has the thin-walled component 10 that does not contact the guide 2 in the closed state and contacts the guide 2 in the open state due to the pressure of the arc-extinguishing gas.

As a result, the gas circuit breaker described in the present embodiment does not contact the guide 2 in the closed state in the vicinity of the downstream end of the insulating nozzle 1 and does not contact the guide 2 in the open state due to the pressure of the arc-extinguishing gas. By having the thin-walled component 10 that contacts the insulating nozzle 1, it is possible to prevent high-temperature, high-pressure arc-extinguishing gas from flowing around the insulating nozzle 1 and flowing back to the main contact side without disturbing the operation of the insulating nozzle 1. You can

FIG. 3 is a schematic view showing a cross section of the gas circuit breaker described in the second embodiment in a closed state.

The gas circuit breaker described in the present embodiment differs from the gas circuit breaker described in the first embodiment in that the tip of the thin-walled component 10 contacts the guide 2 even in the closed state.

Accordingly, when the closed state is changed to the open state, the tip of the thin-walled component 10 spreads to the outer peripheral side due to the pressure of the arc extinguishing gas, and the contact pressure between the tip of the thin-walled component 10 and the guide 2 increases (Example 1). In comparison with the main contact of the fixed-side main contactor 3 and the drive-side main contactor 4, the arc-extinguishing gas that reliably suppresses the high-temperature, high-pressure arc-extinguishing gas from wrapping around the insulating nozzle 1. It is possible to more reliably prevent the backflow of.

Even in the closed state, the thin-walled component 10 in this embodiment contacts the guide 2 to the extent that it does not hinder the operation of the insulating nozzle 1. When shifting from the closed state to the open state, the pressure of the arc-extinguishing gas in the vicinity of the downstream end portion of the insulating nozzle 1 causes the thin-walled component 10 to spread to the outer peripheral side and the contact pressure with the guide 2 to increase.

This can prevent high-temperature, high-pressure arc-extinguishing gas from flowing around the insulating nozzle 1 and flowing back to the main contact side.

When transitioning from the closed state to the open state, the pressure of the arc-extinguishing gas causes the thin-walled component 10 installed near the downstream tip of the insulating nozzle 1 to spread to the outer peripheral side and contact pressure with the guide 2. This prevents the high-temperature, high-pressure arc-extinguishing gas from flowing around the downstream tip portion of the insulating nozzle 1 and flowing back to the main contact side.

Further, when the open state is closed, the arc-extinguishing gas is already exhausted, and the pressure of the arc-extinguishing gas near the downstream tip of the insulating nozzle 1 is reduced. Since the component 10 returns to its original state and the contact pressure is reduced, the operation of the insulating nozzle 1 is not hindered even when the open state is changed to the closed state.

As described above, the gas circuit breaker described in the present embodiment makes perturbable contact with the guide 2 even in the closed state, and contacts the guide 2 due to the pressure of the arc-extinguishing gas in the open state and spreads further to the outer peripheral side. , Having a thin part 10 that increases the contact pressure.

As a result, the gas circuit breaker described in the present embodiment comes into contact with the guide 2 near the downstream end portion of the insulating nozzle 1 even in the closed state, and in the open state due to the pressure of the arc extinguishing gas, the guide 2 By having the thin-walled component 10 that increases the contact pressure that contacts the insulating nozzle 1, the high-temperature, high-pressure arc-extinguishing gas flows around the insulating nozzle 1 and flows back to the main contact side without disturbing the operation of the insulating nozzle 1. This can be reliably prevented.

FIG. 4 is a schematic diagram showing a cross section of the gas circuit breaker described in the third embodiment in a closed state.

In the gas circuit breaker described in the present embodiment, as compared with the gas circuit breaker described in the second embodiment, the thin-walled component 10 is not formed at the tip portion on the downstream side of the insulating nozzle 1, but the insulating nozzle 1 It is different in that it is formed on the upstream side of the downstream end portion of the.

That is, the tip of the thin-walled component 10 may be formed so as to be substantially at the same position as the tip of the insulating nozzle 1 on the downstream side, or the tip of the thin-walled component 10 may be positioned on the downstream side of the insulating nozzle 1. You may form so that it may become a position upstream of a part.

Accordingly, when the closed state is changed to the open state, the tip of the thin-walled component 10 spreads to the outer peripheral side due to the pressure of the arc extinguishing gas, the contact pressure between the tip of the thin-walled component 10 and the guide 2 increases, and high temperature, The high-pressure arc-extinguishing gas is surely prevented from wrapping around the insulating nozzle 1, and the backflow of the arc-extinguishing gas around the main contacts of the fixed-side main contactor 3 and the drive-side main contactor 4 is more reliably prevented. be able to.

FIG. 5: is a schematic diagram which shows the cross section of the closed state of the gas circuit breaker described in Example 4. As shown in FIG.

The gas circuit breaker described in the present embodiment is different from the gas circuit breaker described in the first embodiment in that the thin-walled component 10 is not formed in an arc shape but in a rectangular shape. ..

That is, in the gas circuit breaker described in the present embodiment, when the contact area between the tip of the thin-walled component 10 and the guide 2 increases and the closed-circuit state changes to the open-circuited state, the pressure of the arc-extinguishing gas causes the thin-walled component 10 to move. The front end spreads to the outer peripheral side, the contact surface pressure between the front end of the thin-walled component 10 and the guide 2 increases, and the high-temperature, high-pressure arc-extinguishing gas is more reliably suppressed from wrapping around the insulating nozzle 1, and the fixed-side main contactor It is possible to more reliably prevent the backflow of the arc-extinguishing gas around the main contactor 3 and the drive-side main contactor 4.

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

1... Insulating nozzle, 2... Guide, 3... Fixed side main contactor, 4... Driving side main contactor, 5... Fixed side arc contactor, 6... Driving side arc Contact, 7... Puffer chamfer, 8... Center axis, 10... Thin-walled parts

Claims (6)

When the fixed-side main contact, the drive-side main contact that can be brought into contact with and separated from the fixed-side main contact, and the fixed-side main contact and the drive-side main contact are separated from each other, energization of current is transferred. A fixed arc contactor for generating an arc discharge, a drive side arc contactor that can be brought into contact with and separated from the fixed side arc contactor 5, and a fixed side arc contactor installed on the drive side main contactor. When the drive side arc contact is separated, an arc extinguishing gas is caused to flow, and an arc extinguishing gas is blown between the stationary side arc contactor and the drive side arc contactor to extinguish the arc discharge. A nozzle, and a guide that installs the fixed-side main contactor and the fixed-side arc contactor at positions facing the drive-side main contactor and the drive-side arc contactor,
A puffer-type gas circuit breaker, wherein the insulating nozzle has a thin-walled component that comes into contact with the guide in an open state. The puffer-type gas circuit breaker according to claim 1, wherein the thin-walled component does not contact the guide in a closed state and contacts the guide by the pressure of the arc-extinguishing gas in an open state. The puffer-type gas circuit breaker according to claim 1, wherein the thin-walled component is in perturbable contact with the guide in the closed state and spreads to the outer peripheral side by the pressure of the arc-extinguishing gas in the open state. .. The puffer-type gas circuit breaker according to claim 1, wherein the thin-walled component is formed at a tip portion of the insulating nozzle. The puffer type gas circuit breaker according to claim 1, wherein the thin-walled component is formed in an arc shape. The puffer type gas circuit breaker according to claim 1, wherein the thin-walled component is formed in a rectangular shape.

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