JP2021051945A - Gas circuit breaker, twin-drive type gas circuit breaker and method of disassembling twin-drive type gas circuit breaker - Google Patents

Abstract

To enhance the strength against internal pressure by firmly holding an insulation nozzle.SOLUTION: In order to solve the above problem, a gas circuit breaker includes a puffer cylinder and a puffer piston which are arranged in a container filled with an insulating gas, a pressure generation unit having a gas-blowing insulating nozzle fixed to the tip of the puffer cylinder, a movable energizing contact and a movable arc contact, and a fixed energizing contact and a fixed arc contact which are arranged to face the movable energizing contact and the movable arc contact. The gas circuit breaker drives the movable energizing contact in an axial direction in relation to an operation of the pressure generation unit, and blowing the insulating gas of the pressure generation unit to arc generated when the movable arc contact and the fixed arc contact are separated from each other, thereby extinguishing the arc. The outer circumference of the insulating nozzle is held by a divisible connection adapter, and the movable energizing contact and the insulating nozzle are fixed to each other via the connection adapter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas circuit breaker, a dual-drive gas circuit breaker, and a method for disassembling the dual-drive gas circuit breaker, and is particularly suitable for a gas circuit breaker in which an insulating nozzle is fixed by using a movable energizing contactor. The present invention relates to a twin-drive gas circuit breaker and a method for disassembling the twin-drive gas circuit breaker.

The gas circuit breaker is used to cut off the accident current caused by a short circuit between phases or a ground fault in the electric power system, and a puffer type gas circuit breaker has been widely used conventionally.

In this puffer-type gas circuit breaker, a high-pressure gas flow is generated by mechanically compressing the arc-extinguishing gas by a movable puffer cylinder directly connected to a movable arc contactor. Then, this high-pressure gas flow is blown to the arc generated between the movable arc contactor and the opposite arc contactor, and the current is cut off.

In the above-mentioned puffer type gas circuit breaker, it is considered that the insulating nozzle may fall off due to gas pressure, and as a means for preventing the insulating nozzle from falling off due to this gas pressure, for example, Patent Document 1 describes insulation with a movable energizing contact. A structure for fixing the nozzle via an elastic packing is described.

Japanese Unexamined Patent Publication No. 11-111128

In general, a gas circuit breaker physically separates a fixed arc contactor and a movable arc contactor arranged opposite to each other by the driving force of an actuator, and then blows a high-pressure insulating gas onto an arc generated between the arc contacts. The current is cut off by extinguishing the arc. At this time, since pressure is applied to the insulating nozzle from the inside by the insulating gas, if the strength of the insulating nozzle is insufficient, the insulating nozzle may be broken or deformed, and the gas airtightness of the pressure generating portion may be impaired.

In order to prevent this, it is effective to hold the outer diameter of the insulating nozzle with other parts, but in the structure of Patent Document 1 in which the movable energizing contact and the insulating nozzle are fixed via the packing of the elastic material, the insulating nozzle is used. Since a gap is generated between the ring-shaped movable energizing contacts, there is a problem that it is difficult to assemble the insulating nozzle while firmly holding the insulating nozzle with an external component.

The present invention has been made in view of the above points, and an object of the present invention is a gas circuit breaker, a dual-drive gas circuit breaker, and a dual-drive gas circuit breaker capable of firmly holding an insulating nozzle to improve the strength against internal pressure. The purpose is to provide a method for disassembling the vessel.

In order to achieve the above object, the gas breaker of the present invention has a container filled with an insulating gas, a puffer cylinder and a puffer piston arranged in the container, and a gas fixed to the tip of the puffer cylinder. A pressure generating unit having an insulating nozzle for spraying, a movable energizing contact and a movable arc contact, and the movable energizing contact and the movable arc contact are arranged to face each other, and the movable energizing contact and the movable arc contact and electricity. A fixed energizing contact and a fixed arc contact that can be specifically connected to each other, and the movable energizing contact is driven in the axial direction in relation to the operation of the pressure generating unit, and the movable energizing contact and the movable arc contact are provided. The fixed energizing contact and the fixed arc contact are brought into contact with each other, and the insulating gas of the pressure generating portion is sprayed on the arc generated when the movable arc contact and the fixed arc contact are opened to extinguish the arc. It is a gas circuit breaker, and is characterized in that the outer periphery of the insulating nozzle is held by a divisible connection adapter, and the movable energizing contact and the insulating nozzle are fixed via the connection adapter.

Further, in order to achieve the above object, the dual drive type gas circuit breaker of the present invention includes a container filled with an insulating gas, a puffer cylinder and a puffer piston arranged in the container, and a tip of the puffer cylinder. A pressure generating unit having an insulating nozzle for gas blowing fixed to, a movable energizing contact and a movable arc contact, and the movable energizing contact and the movable arc contact are arranged to face each other, and the movable energizing contact and the movable arc contact are movable. A fixed energizing contactor and an opposing arc contactor that can be electrically connected to the arc contactor are provided, and the opposing arc contactor is the movable energizing contact in relation to the operation of the pressure generating unit and the movable energizing contactor. A dual-drive gas circuit that drives in the axial direction at the same time as the child. The outer periphery of the insulating nozzle is held by a splittable connection adapter, and the movable energizing contact and the insulating nozzle are fixed via the connection adapter. It is characterized by being done.

Further, in the method of disassembling the dual drive gas circuit breaker of the present invention, in order to achieve the above object, a container filled with an insulating gas, a puffer cylinder and a puffer piston arranged in the container, and the puffer A pressure generating unit having an insulating nozzle for gas blowing fixed to the tip of a cylinder, a movable energizing contact and a movable arc contact, and the movable energizing contact and the movable arc contact are arranged to face each other, and the movable energizing contact is provided. A fixed energizing contactor and an opposing arc contactor that can be electrically connected to the child and the movable arc contactor are provided, and the opposed arc contactor is the opposed arc contactor in relation to the operation of the pressure generating unit and the movable energizing contactor. It is driven in the axial direction at the same time as the movable energizing contact, and the outer periphery of the insulating nozzle is held by a divisible connection adapter, and the movable energizing contact and the insulating nozzle are fixed via the connection adapter. The maximum outer diameter of the insulating nozzle is smaller than the inner diameter of the movable energizing contact, the connection adapter is arranged inside the movable energizing contact, and the movable energizing contact is via the connecting adapter. When disassembling the twin-drive gas breaker fixed to the puffer cylinder with a bolt, the step 1 of removing the bolt fixing the movable energizing contact and the connection adapter to the puffer cylinder, and the connection. The step 2 of dividing the adapter and removing the divided connection adapter from the gap between the parts of the pressure generating portion and the movable electrode portion having the movable energizing contact, and the step 2 of removing the insulating nozzle from the inside of the movable energizing contact. 3 and a step 4 of removing the movable energizing contact from which the insulating nozzle has been removed from the gap between the parts of the movable electrode portion.

According to the present invention, the insulating nozzle can be firmly held and the strength against internal pressure can be improved.

It is sectional drawing which shows Example 1 of the gas circuit breaker of this invention. It is a figure which shows the connection adapter used in Example 1 of the gas circuit breaker of this invention. It is a figure which shows the process 1 of the disassembly procedure in the twin drive type gas circuit breaker which is Example 2 of this invention. It is a figure which shows the step 2 of the disassembly procedure in the twin drive type gas circuit breaker which is Example 2 of this invention. It is a figure which shows the step 3 of the disassembly procedure in the twin drive type gas circuit breaker which is Example 2 of this invention. It is a figure which shows the step 4 of the disassembly procedure in the twin drive type gas circuit breaker which is Example 2 of this invention.

Hereinafter, a method of disassembling the gas circuit breaker, the dual-drive gas circuit breaker, and the dual-drive gas circuit breaker of the present invention will be described based on the illustrated examples. In each figure, the same reference numerals are used for the same components.

In addition, the following is just an example of implementation, and it is not intended to limit the content of the invention to the following specific aspects. The invention itself can be implemented in various aspects in accordance with the contents described in the claims.

FIG. 1 shows Example 1 of the gas circuit breaker of the present invention.

As shown in the figure, the gas breaker of this embodiment includes a container filled with an insulating gas (not shown), a puffer cylinder 6 and a puffer piston 7 arranged in the container, and a puffer cylinder 6. A pressure generating unit 11 having an insulating nozzle 1 for gas blowing fixed to the tip of the cylinder, a movable arc contact 5 connected to a movable energizing contact 2 and an operation rod 8, a movable energizing contact 2 and a movable arc. It is roughly configured with a movable energizing contact 2 and a fixed energizing contact and a fixed arc contact (not shown) that are electrically connected to the movable arc contact 5 and are arranged to face the contact 5.

Then, the movable current-carrying contact 2 is driven in the axial direction in relation to the operation of the pressure generating unit 11, and the movable current-carrying contact 2 and the movable arc contact 5 are separated from each other and the fixed current-carrying contact and the fixed arc contact are moved. The insulating gas of the pressure generating unit 11 is blown against the arc generated when the arc contact 5 and the fixed arc contact are separated to extinguish the arc and cut off the current.

In the gas circuit breaker of the present embodiment configured as described above, the outer circumference of the insulating nozzle 1 is held by a splittable connection adapter 3, and the movable energizing contact 2 and the insulating nozzle 1 are fixed via the connection adapter 3. ing.

Further, the connection adapter 3 is arranged inside the movable energizing contact 2, and the movable energizing contact 2 is fixed to the puffer cylinder 6 via the connecting adapter 3 with a fixing bolt 4.

Further, a protrusion 1a and a screw portion 1b are provided on the side opposite to the tip of the insulating nozzle 1 (on the puffer piston 7 side), and the inner diameter of the connection adapter 3 is smaller than the outer diameter of the protrusion 1a. The insulating nozzle 1 is pressed and held by the puffer cylinder 6 via the connection adapter 3 by the fixing bolt 4, and is connected to the puffer cylinder 6 by the screw portion 1b.

Further, the inner circumference of the connection adapter 3 is in close contact with the outer circumference of the insulation nozzle 1 to hold the insulation nozzle 1.

Further, as shown in FIG. 2, the connection adapter 3 is formed in a donut shape and is divided into two by the dividing portion 3a in the circumferential direction, and is further fixed to the connection adapter 3 formed in the donut shape. A plurality of bolt holes 3b into which the bolts 4 are inserted are formed at predetermined intervals in the circumferential direction.

More specifically, in the gas circuit breaker of this embodiment, as shown in FIG. 1, the movable energizing contact 2 is fixed to the puffer cylinder 6 with a fixing bolt 4 via a connection adapter 3. Further, the insulating nozzle 1 is provided with a protrusion 1a and a screw portion 1b, and the inner diameter of the connection adapter 3 is made smaller than the outer diameter of the protrusion 1a, and the screw portion 1b connects to the puffer cylinder 6. The insulation nozzle 1 is prevented from falling off. The inner circumference of the connection adapter 3 is in close contact with the outer circumference of the insulating nozzle 1 and firmly holds the insulated nozzle 1.

As shown in FIG. 2, the connection adapter 3 is divided into two in the circumferential direction by the dividing portion 3a. For example, in the case of a ring-shaped component having no divided portion 3a, it is necessary to design the inner diameter of the ring to be larger than the outer diameter of the insulating nozzle 1 so that the insulating nozzle 1 can pass through the inner diameter of the ring. However, by providing the connecting adapter 3 with the split portion 3a, the insulating nozzle 1 can be assembled so as to be sandwiched between the connection adapters 3, and the gap in the split portion 3a and the play of the bolt holes 3b are used to provide radial directions. Since the dimensions can be finely adjusted, the insulating nozzle 1 can be held more firmly than in the conventional structure.

In this embodiment, the connection adapter 3 is divided into two in the circumferential direction by the division portion 3a, but the number of divisions is not limited to this. However, considering the ease of assembly, the connection adapter 3 is preferably divided into two or three parts.

As described above, according to the present embodiment, since it is not necessary for the insulating nozzle 1 to pass through the inside of the connection adapter 3 at the time of assembly, the insulating nozzle 1 is assembled in a state where the inner circumference of the connection adapter 3 and the outer circumference of the insulating nozzle 1 are in close contact with each other. be able to. As a result, since the insulating nozzle 1 can be held more firmly than the conventional structure, the strength against the internal pressure is improved.

Further, by dividing the connection adapter 3 that holds the insulating nozzle 1, the degree of freedom in the structure of the movable energizing contact 2 is increased. That is, in the conventional structure, the movable energizing contact 2 needs to be designed to satisfy both the performance of holding the insulating nozzle 1 and the electric field performance, but according to this embodiment, the movable energizing contact 2 is used. Since it is not necessary to hold the insulating nozzle 1, it is only necessary to satisfy the electric field performance, and the structure can be freely designed.

During the shutoff operation, a small arc is generated between the movable energized contact 2 and the fixed energized contact, but the connection adapter 3 in this embodiment is located inside the movable energized contact 2. Therefore, since there is no concern of being directly exposed to the arc, a lightweight material such as aluminum, which cannot be applied to a place directly exposed to the arc, can be adopted as the material of the connection adapter 3.

In addition, according to the present embodiment, even when the insulating nozzle 1 is deformed by the internal pressure, the parts of the movable electrode portion 9 including the pressure generating portion 11 and the movable energizing contact 2 can be removed, and maintenance work can be performed. It can be simplified.

An example of a dual-drive gas circuit breaker as Example 2 of the present invention will be described with reference to FIGS. 3 (a), 3 (b), 3 (c) and 3 (d) together with a method for disassembling the twin-drive gas circuit breaker. ..

The configuration of the dual-drive gas circuit breaker of this embodiment is substantially the same as the configuration of the gas circuit breaker described in the first embodiment, but in the case of the dual-drive gas circuit breaker, the pressure generating unit 11 and the movable energizing contact 2 are used. The movable electrode portion 9 having the movable electrode portion 9 and the opposed arc contactor (not shown) arranged to face each other are connected by a connecting rod 10, and the opposed arc contact is related to the operation of the pressure generating portion 11 and the movable energizing contactor 2. It is a dual drive type in which the child is driven in the axial direction at the same time as the movable energizing contact 2.

In the dual drive type gas circuit breaker having such a configuration, in this embodiment, the outer circumference of the insulating nozzle 1 is held by a splittable connection adapter 3, and the movable energizing contact 2 and the insulating nozzle 1 are held via the connection adapter 3. Is fixed.

Further, in the dual drive type gas circuit breaker, since the connecting rod 10 passes through the inside of the movable energizing contact 2, the movable energizing contact 2 cannot be removed in the conventional structure, and the movable electrode portion 9 can be easily removed. Could not be disassembled.

On the other hand, in this embodiment, the outer circumference of the insulating nozzle 1 is held by the splittable connection adapter 3, and the movable energizing contact 2 and the insulating nozzle 1 are fixed via the splittable connection adapter 3. Therefore, by performing the procedure shown in FIGS. 3 (a), 3 (b), 3 (c) and 3 (d), each component of the movable electrode portion 9 can be disassembled.

That is, first, as shown in FIG. 3A, the step 1 of removing the fixing bolt 4 fixing the movable energizing contact 2 and the connection adapter 3 to the puffer cylinder 6 is performed, and secondly, FIG. As shown in 3 (b), the connection adapter 3 is divided into two, and the divided connection adapter 3 is divided into parts of the movable electrode portion 9 (for example, between shields arranged around the movable electrode portion 9). The step 2 of removing from the gap is performed, and thirdly, as shown in FIG. 3C, the step 3 of passing the insulating nozzle 1 through the inside of the movable energizing contact 2 to remove the insulating nozzle 1 is performed, and fourthly, FIG. 3 (d) is performed. ), The step 4 of removing the movable energizing contact 2 from which the insulating nozzle 1 has been removed from the gap between the parts of the movable electrode portion 9 (for example, between the shields arranged around the movable electrode portion 9) is performed. This makes it possible to disassemble each component of the movable electrode portion 9.

The present invention is not limited to the above-described examples, and includes various modifications. For example, the above-described examples 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, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Insulated nozzle, 1a ... Insulated nozzle protrusion, 1b ... Insulated nozzle screw, 2 ... Movable energizing contact, 3 ... Connection adapter, 3a ... Connection adapter split, 3b ... Connection adapter bolt hole, 4 ... Fixing bolt, 5 ... Movable arc contactor, 6 ... Puffer cylinder, 7 ... Puffer piston, 8 ... Operating rod, 9 ... Movable electrode part, 10 ... Connecting rod, 11 ... Pressure generating part.

Claims (15)

A container filled with insulating gas and
With the puffer cylinder and puffer piston arranged in the container,
A pressure generating unit having an insulating nozzle for gas blowing fixed to the tip of the puffer cylinder,
Movable energizing contacts and movable arc contacts,
A fixed energizing contact and a fixed arc contact which are arranged to face the movable energizing contact and the movable arc contact and which can be electrically connected to the movable energizing contact and the movable arc contact are provided.
The movable energizing contact is driven in the axial direction in relation to the operation of the pressure generating unit, and the movable energizing contact and the movable arc contact are brought into contact with and separated from the fixed energizing contact and the fixed arc contact.
A gas circuit breaker that extinguishes an arc generated by opening and detaching the movable arc contactor and the fixed arc contactor by spraying an insulating gas from the pressure generating portion.
A gas circuit breaker characterized in that the outer circumference of the insulating nozzle is held by a divisible connection adapter, and the movable energizing contact and the insulating nozzle are fixed via the connection adapter. The gas circuit breaker according to claim 1.
The connection adapter is a gas circuit breaker, characterized in that it is arranged inside the movable energizing contact. The gas circuit breaker according to claim 2.
The movable energizing contact is a gas circuit breaker characterized in that the movable energizing contact is bolted to the puffer cylinder via the connection adapter. The gas circuit breaker according to claim 3.
A protrusion and a screw portion are provided on the side opposite to the tip of the insulating nozzle, the inner diameter of the connection adapter is made smaller than the outer diameter of the protrusion, and the insulating nozzle is connected by the bolt. A gas circuit breaker characterized in that it is pressed and held by the puffer cylinder via an adapter and is connected to the puffer cylinder by the screw portion. The gas circuit breaker according to claim 4.
A gas circuit breaker characterized in that the inner circumference of the connection adapter is in close contact with the outer circumference of the insulating nozzle to hold the insulated nozzle. The gas circuit breaker according to any one of claims 1 to 5.
The connection adapter is a gas circuit breaker characterized in that a donut-shaped one is divided into at least two in the circumferential direction. The gas circuit breaker according to claim 6.
The connection adapter formed in a donut shape is a gas circuit breaker characterized in that a plurality of bolt holes into which bolts are inserted are formed at predetermined intervals in the circumferential direction. The gas circuit breaker according to any one of claims 2 to 7.
The connection adapter is a gas circuit breaker, characterized in that it is made of aluminum. A container filled with insulating gas and
With the puffer cylinder and puffer piston arranged in the container,
A pressure generating unit having an insulating nozzle for gas blowing fixed to the tip of the puffer cylinder,
Movable energizing contacts and movable arc contacts,
A fixed energizing contact and an opposed arc contact that are arranged to face the movable energizing contact and the movable arc contact and are electrically connectable to the movable energizing contact and the movable arc contact are provided.
A twin-drive gas circuit breaker in which the opposed arc contactor is driven axially at the same time as the movable energizing contact in relation to the operation of the pressure generating unit and the movable energizing contact.
A dual-drive gas circuit breaker in which the outer circumference of the insulating nozzle is held by a splittable connection adapter, and the movable energizing contact and the insulating nozzle are fixed via the connection adapter. The twin-drive gas circuit breaker according to claim 9.
A dual-drive gas circuit breaker characterized in that the maximum outer diameter of the insulating nozzle is smaller than the inner diameter of the movable energizing contactor. The twin-drive gas circuit breaker according to claim 9 or 10.
The connection adapter is arranged inside the movable energizing contact, and the movable energizing contact is bolted to the puffer cylinder via the connecting adapter. .. The twin-drive gas circuit breaker according to claim 11.
A protrusion and a screw portion are provided on the side opposite to the tip of the insulating nozzle, the inner diameter of the connection adapter is made smaller than the outer diameter of the protrusion, and the insulating nozzle is connected by the bolt. A dual-drive gas circuit breaker characterized in that it is pressed and held by the puffer cylinder via an adapter and is connected to the puffer cylinder by the screw portion. The twin-drive gas circuit breaker according to any one of claims 9 to 12.
The connection adapter formed in a donut shape is divided into at least two in the circumferential direction, and the connection adapter formed in a donut shape has a plurality of bolt holes into which bolts are inserted at predetermined intervals in the circumferential direction. A twin-drive gas circuit breaker that is characterized by being The twin-drive gas circuit breaker according to any one of claims 11 to 13.
The connection adapter is a dual-drive gas circuit breaker, characterized in that it is made of aluminum. A container filled with insulating gas and
With the puffer cylinder and puffer piston arranged in the container,
A pressure generating unit having an insulating nozzle for gas blowing fixed to the tip of the puffer cylinder,
Movable energizing contacts and movable arc contacts,
A fixed energizing contact and an opposed arc contact that are arranged to face the movable energizing contact and the movable arc contact and are electrically connectable to the movable energizing contact and the movable arc contact are provided.
In connection with the operation of the pressure generating unit and the movable energizing contact, the opposed arc contact is driven in the axial direction at the same time as the movable energizing contact.
The outer circumference of the insulating nozzle is held by a splittable connection adapter, and the movable energizing contact and the insulating nozzle are fixed via the connection adapter.
The maximum outer diameter of the insulating nozzle is smaller than the inner diameter of the movable energizing contact, the connection adapter is arranged inside the movable energizing contact, and the movable energizing contact is via the connecting adapter. When disassembling the twin-drive gas circuit breaker that is bolted to the puffer cylinder
Step 1 of removing the bolt fixing the movable energizing contact and the connection adapter to the puffer cylinder, and
Step 2 of dividing the connection adapter and removing the divided connection adapter from the gap between the parts of the pressure generating portion and the movable electrode portion having the movable energizing contact.
Step 3 of removing the insulating nozzle by passing it through the inside of the movable energizing contact.
A method for disassembling a dual-drive gas circuit breaker, which comprises a step 4 of removing the movable energizing contact from which the insulating nozzle has been removed from a gap between parts of the movable electrode portion.

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