JP2020092069A - Mobile gas circuit breaker - Google Patents

Abstract

To provide a mobile gas circuit breaker that simplifies filling and recovery of gas during transportation.SOLUTION: A mobile gas circuit breaker includes a circuit breaker body 11, a gas tank 20 having a double structure including an inner tank 21 made of an inflatable bag such as rubber and an outer tank 22 covering the inner tank 21, and a compressor 30 that injects gas into a space between the inner tank 21 and the outer tank 22, and when a SFgas is recovered from the circuit breaker body 11, a connection valve 25 between the circuit breaker body 11 and the inner tank 21 is opened to allow the SFgas to flow from the circuit breaker body 11 to the inner tank 21, and when the circuit breaker body 11 is filled with the SFgas, the connection valve 25 is opened and the air in the outer tank 22 is flowed in by the compressor 30 to crush the inner tank 21 to cause the SFgas to flow from the inner tank 21 to the circuit breaker body 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas circuit breaker for cutting off a large current, and more particularly to a mobile gas circuit breaker that is transported to a disaster area or the like for use.

The gas circuit breaker is filled with an insulating gas such as SF ⁶ gas at a high pressure (for example, 5 kgf/cm ² ), and in order to move such a gas circuit breaker, the SF ⁶ gas is once recovered. There is a need. This is because the internal structure of the gas circuit breaker is complicated, and when the high-pressure gas is transported while being filled, gas may leak due to vibration or the like.

Therefore, conventionally, when a gas circuit breaker was transported, SF ⁶ gas was collected from the gas circuit breaker before transportation, and the gas circuit breaker was refilled with SF ⁶ gas at the transport destination.

FIG. 7 is a schematic configuration diagram showing a state in which the conventional gas circuit breaker 100 and the gas recovery device 110 are connected.

Specifically, first, the gas recovery device 110 including the gas tank 111, the vacuum pump 112, and the compressor 113 is connected to the gas circuit breaker 100 to recover SF ⁶ gas in the gas tank 111. Next, the gas recovery device 110 is removed from the gas circuit breaker 100, and the degassed gas circuit breaker 100 and the gas recovery device 110 are transported to the transport destination. Then, at the destination, the gas recovery device 110 is reconnected to the gas circuit breaker 100, and SF ⁶ gas is refilled from the gas recovery device 110 into the gas circuit breaker 100. After the gas circuit breaker 100 is completely filled with SF ⁶ gas, the gas recovery device 110 is disconnected from the gas circuit breaker 100 to enable the gas circuit breaker 100 to operate.

JP, 2011-060725, A

However, since the gas recovery device 110 is composed of the gas tank 111, the vacuum pump 112, the compressor 113, and the like, the gas recovery device 110 itself is large and heavy, and thus the time and effort required for the transportation and the transportation cost are great. .. In addition, there is a problem that it takes time and labor to connect and disconnect the gas circuit breaker 100 and the gas recovery device 110 in the field, and the gas circuit breaker cannot be quickly operated at the destination.

The invention of Patent Document 1 only describes a gas recovery device, and is not provided integrally with the gas circuit breaker, but has the above-mentioned problem. However, the SF ⁶ gas recovery tank is described as a gas collection bag.

However, the gas recovery tank described in Patent Document 1 only has a bag tank (gas collection bag), and there is a problem that the gas recovery tank may be damaged during handling and the handleability may be poor.

In order to solve the above-mentioned problems, the invention of claim 1 is such that a circuit breaker main body that opens and closes a current in a high-voltage insulating gas, and stores the insulating gas in the circuit breaker main body while containing the insulating gas. A gas tank consisting of an inner tank whose accommodation volume is variable and an outer tank covering the inner tank, a connection valve connecting the inner tank and the circuit breaker body, and a reduction for reducing the accommodation capacity of the inner tank When recovering the insulating gas of the circuit breaker body, the connection valve is opened to allow the insulating gas to flow from the circuit breaker body into the inner tank, so that the circuit breaker body is insulated. When the gas is filled, the connection valve is opened and the accommodation volume of the inner tank is reduced by the reducing means so that the insulating gas flows from the inner tank into the breaker body. .

According to the present invention, the insulating gas on the circuit breaker body side of the gas circuit breaker is set to a low pressure, and the gas circuit breaker is conveyed integrally with the gas tank.

According to a second aspect of the present invention, in the mobile gas circuit breaker according to the first aspect, the inner tank is formed of a bag that is expandable and contractable, and the reducing means is provided in a space between the inner tank and the outer tank. It is characterized by comprising a compressor for allowing gas to flow in and reducing the accommodation volume.

According to a third aspect of the present invention, in the mobile gas circuit breaker according to the first aspect, the reducing unit is a pressing unit that presses the inner tank to reduce the accommodation volume.

According to a fourth aspect of the present invention, there is provided a circuit breaker main body for opening and closing an electric current in a high-voltage insulating gas, an inner tank for storing the insulating gas in the circuit breaker main body and a variable accommodation volume, and an inner tank. Insulation in a mobile gas circuit breaker including a gas tank including an outer tank that covers, a connection valve that connects the inner tank and the circuit breaker body, and a reduction unit that reduces the accommodation volume of the inner tank. A method for recovering and filling gas, wherein the connecting valve is opened to recover insulating gas from the main body of the circuit breaker to the inner tank before the moving gas circuit breaker is moved, and the connecting valve is closed. Moving the mobile gas circuit breaker, and after moving the mobile gas circuit breaker, opening the connection valve and reducing the accommodation volume of the inner tank by the reducing means to fill the circuit breaker body with insulating gas; It is characterized by

According to the invention of claim 1 and claim 4, since the inner tank for collecting the SF ⁶ gas to the expansion and contraction freely bag, the SF ⁶ gas flows into the inner tank, the volume of the inner tank is gradually increased The internal pressure is gradually increased, and the SF ⁶ gas is transferred smoothly. Therefore, as compared with the conventional case, the pressure reduction on the circuit breaker body side can be further promoted, and the circuit breaker body can be further reduced in pressure. As a result, the insulating gas in the movable gas circuit breaker remains, but the pressure is low, so there is no gas leakage due to vibration during transportation.

According to the invention of claim 2, since the reducing means for reducing the inner tank is the compressor and the gas is caused to flow into the space between the outer tank and the inner tank, the compressor is relatively small. It is possible to suppress the increase in size of the entire device.

According to the third aspect of the present invention, since the reducing means for reducing the inner tank is used as the pressing means, the insulating gas filled in the inner tank can be reliably discharged to the circuit breaker main body side with a mechanical structure. it can.

Embodiment 1 of this invention is shown with FIG.2 and FIG.3, and this figure is a block diagram which shows the outline of the whole. It is a principal part enlarged view which shows the state before filling a circuit breaker main body with gas. It is a principal part enlarged view which shows the state after filling the circuit breaker main body with gas. A second embodiment of the present invention will be described with reference to FIGS. 5 and 6, and this figure is a configuration diagram showing an overall outline. It is a principal part enlarged view which shows the state before filling a circuit breaker main body with gas. It is a principal part enlarged view which shows the state after filling the circuit breaker main body with gas. It is a block diagram which shows schematically the conventional gas circuit breaker and the gas recovery apparatus.

Hereinafter, the present invention will be described based on the illustrated embodiments.

(Embodiment 1)
1 to 3 show a mobile gas circuit breaker 10 according to the first embodiment, FIG. 1 is a schematic configuration diagram of the whole, and FIG. 2 is a view before charging the circuit breaker body with gas. FIG. 3 is an enlarged view of an essential part showing a state after filling the circuit breaker body with gas.

The mobile gas circuit breaker 10 is transported to a disaster area for use in an emergency such as a disaster.

The mobile gas circuit breaker 10 includes a circuit breaker main body 11 that opens and closes an electric current in a high-pressure insulating gas (for example, SF ⁶ gas), an inner tank 21 that stores the SF ⁶ gas, and has a variable accommodation volume. A gas tank 20 including an outer tank 22 that covers the inner tank 21, a connection valve 25 that connects the inner tank 21 and the circuit breaker body 11, and a space 23 between the inner tank 21 and the outer tank 22. And a compressor 30 into which air flows.

The circuit breaker main body 11 is connected to the gas tank 11 via the connection valve 25. If the circuit breaker main body 11 and the inner tank 21 are all filled with the circuit breaker main body 11, the circuit breaker main body 11 SF ⁶ gas in an amount such that the pressure becomes 5 kgf/cm ² is enclosed.

The inner tank 21 is made of an inflatable and inflatable bag such as rubber, and is housed in the outer tank 22 to form a double-structured gas tank 20. The outer tank 22 is made of metal and can withstand high pressure like a so-called gas cylinder. It is a reward.

A compressor 30 is connected to the outer tank 22 via a valve 31, and when the compressor 30 is started, air flows into the outer tank 22 to have a high pressure. The inner tank 21 is contracted by receiving pressure from its outer surface.

The compressor 30 is for injecting gas into the space 23 between the outer tank 22 and the inner tank 21, and its pressure is 5 kgf/cm ² in the circuit breaker main body 11. Since it suffices that it is approximately the same or slightly higher, a relatively small compressor 30 can be used.

Next, a procedure for filling and collecting SF ⁶ gas in the circuit breaker body 11 will be described.

Since the mobile gas circuit breaker 10 is transported to a disaster area for use in an emergency such as a disaster, normally, the circuit breaker body 11 is not filled with SF ⁶ gas and the inner tank 21 is It is stored while being filled with SF ⁶ gas (see FIG. 2). Therefore, since it is necessary to fill the circuit breaker body 11 side with SF ⁶ gas at the destination, first, the filling of the circuit breaker body 11 with SF ⁶ gas will be described.

In the transferred mobile gas circuit breaker 10, the inner tank 21 of the gas tank 20 is filled with SF ⁶ gas, the circuit breaker body 11 is not filled with SF ⁶ gas, and the connection valve 25 is closed. It is in the state of being (see FIG. 2).

Further, the inner tank 21 is expanded in the outer tank 22, and there is almost no space 23 between the outer tank 22 and the inner tank 21, and a valve 31 connecting the outer tank 22 and the compressor 30 is provided. Is also blocked.

First, the connection valve 25 and the valve 31 are opened, and the compressor 30 is started. By opening the connection valve 25, the inner tank 21 and the circuit breaker main body 11 communicate with each other, the SF ⁶ gas in the inner tank 21 is gradually transferred into the circuit breaker main body 11, and the inner tank 21 begins to contract. . Further, when the compressor 30 is started, air is introduced into the outer tank 22, and the inner tank 21 is pressed from the outer surface thereof. When the pressure in the space 23 between the outer tank 22 and the inner tank 21 increases, the inner tank 21 further contracts, and all the SF ⁶ gas in the inner tank 21 is transferred to the circuit breaker body 11 side (see FIG. 3). .

At this time, the inner tank 21 is almost crushed, and the pressure in the circuit breaker body 11 is set to 5 kgf/cm ² .

In this state, the connection valve 25 is closed, the compressor 30 is stopped, and the valve 31 is closed to complete the filling of the circuit breaker main body 11 with SF ⁶ gas, and the mobile gas circuit breaker 10 is operated. It is made possible.

Although not shown, the outer tank 22 is provided with a valve for releasing the internal pressure, and the valve is opened when the movable gas circuit breaker 10 is in an operable state. The internal pressure of is brought to atmospheric pressure.

Next, a procedure for recovering the SF ⁶ gas from the circuit breaker body 11 of the mobile gas circuit breaker 10 used in the gas tank 20 will be described.

First, the connection valve 25 between the circuit breaker body 11 and the inner tank 21 is opened. In addition, the valve (not shown) provided in the outer tank 22 is also opened. As a result, since the inner tank 21 and the circuit breaker main body 11 communicate with each other, the SF ⁶ gas is gradually transferred from the circuit breaker main body 11 side into the inner tank 21 due to the pressure difference between the two, and the inner tank 21 gradually expands. However, the inside of the circuit breaker main body 11 is gradually decompressed to a low pressure. At this time, the space 23 between the inner tank 21 and the outer tank 22 becomes narrower as the inner tank 21 expands, but since the air in the outer tank 22 flows out by opening the valve, the inner tank 21 expands. Will not be hindered.

Then, with the circuit breaker main body 11 in a low pressure state, the valves 25 and 30 are closed to enable the transfer.

According to the mobile gas circuit breaker 10 according to the first embodiment, since the inner tank 21 for collecting the SF ⁶ gas is a bag that can be expanded and contracted such as rubber, when the SF ⁶ gas flows into the inner tank 21. The volume of the inner tank 21 is gradually increased and the internal pressure thereof is gradually increased, so that the SF ⁶ gas can be transferred smoothly. Therefore, compared with the case where SF ⁶ gas is collected in a metal gas tank as in the related art, the pressure reduction on the circuit breaker body 11 side can be promoted more and the circuit breaker body 11 can be made lower pressure. .

Further, as described above, the gas tank 20 for gas recovery does not require a vacuum pump or a large compressor, and thus can be downsized, and thus the circuit breaker body 11 and the gas tank 20 can be connected. Therefore, unlike the conventional case, it is not necessary to separately transport the movable gas circuit breaker and the gas recovery device, and the connection and disconnection work between the gas circuit breaker and the gas tank before and after the transportation becomes unnecessary. Therefore, it is possible to quickly carry out from transportation to installation and operation start, and it is possible to effectively function even in an emergency such as a disaster.

Further, the inner tank 21 for collecting the SF ⁶ gas is a bag, but since the gas tank 20 has a double structure by being covered with the outer tank 22 made of metal, the inner tank 21 is not damaged.

Since it is preferable that the pressure inside the circuit breaker main body 11 is lower during transportation, it is conceivable to increase the capacity of the gas tank in order to further reduce the pressure. Alternatively, a small pump may be supplementarily used to forcibly transfer the SF ⁶ gas of the circuit breaker main body 11 to the gas tank 20. By doing so, it is possible to reduce the size of the gas tank 20 without increasing the capacity.

Further, in the first embodiment, the compressor 30 is used as the reducing means for reducing the accommodation volume of the inner tank 21, but the present invention is not limited to this, and may be an electric or manual pump. The point is that any gas can be introduced into the space between the outer tank 22 and the inner tank 21, and the pressure can be set to 5 kgf/cm ² or more.

(Embodiment 2)
4 to 6 show a mobile gas circuit breaker 40 according to the second embodiment, FIG. 4 is a schematic configuration diagram of the whole, and FIG. 5 is a diagram before charging the circuit breaker body with gas. FIG. 6 is an enlarged view of an essential part showing a state of FIG. 6, and FIG. 6 is an enlarged view of an essential part showing a state after the breaker body is filled with gas.

The second embodiment differs from the first embodiment in that the reducing means for reducing the inner tank 51 is the pressing means 60 for directly pressing the inner tank 51, and is the same as the first embodiment. With respect to the configuration, the same reference numerals are given and the description thereof is omitted.

The gas tank 50 is similar to the first embodiment in that it is composed of an inner tank 51 and an outer tank 52, but a pressing member 61 for pressing the inner tank 51 toward one end side is provided in the outer tank 52. Has been.

The pressing means 60 includes a pressing member 61 that slides in the outer tank 52, and a drive mechanism 62 that slides the pressing member 61. The drive mechanism 62 and the pressing member 61 are connected by a rod 63. ing.

The drive mechanism 62 is provided at one end of the outer tank 52 opposite to the inner tank 51, and the pressing member 61 is arranged on the inner tank 51 side of the drive mechanism 62.

By driving the driving mechanism 62, the pressing member 61 reciprocates in the outer tank 52 in the direction of pressing the inner tank 51 and in the opposite direction.

First, the procedure for filling the breaker body 11 with SF ⁶ gas will be described.

By opening the connecting valve 25, the breaker body 11 and the the inner tank 51 communicates, in SF ⁶ gas is gradually breaker body 11 gradually SF ⁶ gas is the pressure difference in both the inner tank 51 Be transferred to.

When the drive mechanism 62 of the pressing means 60 is driven, the pressing member 61 moves from the drive mechanism 62 side to the other end side, so that the inner tank 51 is pressed and contracted. As a result, the SF ⁶ gas in the inner tank 51 is further transferred to the circuit breaker body 11 side.

Then, the pressing means 60 is driven until the inner tank 51 is crushed, and when the inner tank 51 is crushed, all the SF ⁶ gas is transferred to the circuit breaker body 11 side.

In this state, the driving of the pressing means 60 is stopped and the connection valve 25 is closed to complete the filling of the circuit breaker body 11 with the SF ⁶ gas, and the movable gas circuit breaker 40 is made operable. It

Next, a procedure for recovering SF ⁶ gas from the circuit breaker body 11 of the movable gas circuit breaker 40 used to the gas tank 50 will be described.

First, the drive mechanism 62 is driven to move the pressing member 61 to a position separated from the inner tank 51. Then, the connection valve 25 between the circuit breaker body 11 and the inner tank 51 is opened. As a result, since the inner tank 51 and the circuit breaker main body 11 communicate with each other, the SF ⁶ gas is gradually transferred from the circuit breaker main body 11 side into the inner tank 51 due to the pressure difference between the two, and the inner tank 51 gradually expands. However, the inside of the circuit breaker main body 11 is gradually decompressed to a low pressure. As described above, since the pressing member 61 is previously moved to the position separated from the inner tank 51, the expansion of the inner tank 51 is not hindered.

Then, with the circuit breaker main body 11 in a low pressure state, the connection valves 25 are closed to enable the transfer.

In the movable gas circuit breaker 40 according to the second embodiment, since the pressing means 60 is the reducing means for reducing the inner tank 51 of the inflatable and inflatable bag body made of rubber or the like, the mechanical structure ensures reliable operation. Further, the SF ⁶ gas with which the inner tank 51 is filled can be discharged to the circuit breaker body 11 side.

Although the respective embodiments of the present invention have been described above, the specific configuration is not limited to the above-mentioned respective embodiments, and there may be a design change or the like within a range not departing from the gist of the present invention. , Included in this invention.

10 Mobile Gas Circuit Breaker 11 Circuit Breaker Main Body 20 Gas Tank 21 Inner Tank 22 Outer Tank 25 Connection Valve 30 Compressor (Reducing Means)
40 Gas Circuit Breaker 41 Circuit Breaker Main Body 50 Gas Tank 51 Inner Tank 52 Outer Tank 60 Pressing Means (Reducing Means)

Claims (4)

A circuit breaker body for opening and closing an electric current in a high-voltage insulating gas, an inner tank for storing the insulating gas in the circuit breaker body, accommodating the insulating gas, and a variable accommodation volume thereof, and the inner tank A gas tank consisting of an outer tank that covers the inner tank, a connection valve that connects the inner tank and the circuit breaker body, and a reducing unit that reduces the accommodation volume of the inner tank,
When recovering the insulating gas of the circuit breaker body, the connection valve is opened to allow the insulating gas to flow from the circuit breaker body into the inner tank,
When filling the insulating gas into the circuit breaker body, the connection valve is opened, and the volume of the inner tank is reduced by the reduction means to reduce the insulating gas from the inner tank to the circuit breaker body. A mobile gas circuit breaker characterized by flowing into the. The inner tank is made of a bag that can be expanded and contracted,
The reducing means comprises a compressor that reduces the accommodation volume by causing gas to flow into a space between the inner tank and the outer tank.
The mobile gas circuit breaker according to claim 1, wherein: The movable gas circuit breaker according to claim 1, wherein the reducing means comprises a pressing means for pressing the inner tank to reduce the accommodation volume. A circuit breaker body for opening and closing an electric current in a high-voltage insulating gas, an inner tank for storing the insulating gas in the circuit breaker body, accommodating the insulating gas, and a variable accommodation volume thereof, and the inner tank In a movable gas circuit breaker, comprising: a gas tank including an outer tank that covers the inner tank; a connection valve that connects the inner tank and the circuit breaker body; and a reduction unit that reduces the accommodation volume of the inner tank. A method of collecting and filling insulating gas,
Before moving the mobile gas circuit breaker, the connection valve is opened to collect the insulating gas from the circuit breaker body into the inner tank,
Moving the mobile gas circuit breaker by closing the connection valve,
After the moving type gas circuit breaker is moved, the connecting valve is opened and the volume of the inner tank is reduced by the reducing means to fill the insulating gas into the circuit breaker body. Recovery and filling method of insulating gas for gas circuit breaker.

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