JP2000067716A - Gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker which maintains high extinction and insulation capacities at extinguishing arc and reduces the usage of an arc- extinguishing gas. SOLUTION: A gas-blast circuit breaker has a closed insulating housing 26 of which both ends are closed and in which an arc-extinguishing gas is filled, and a conductive housing 24 in which either the arc-extinguishous gas or mixed gas of the arc-extinguishing gas and gas which minimizes an effect on global warming is filled. A fixed contact and a movable contact are housed in the closed insulating housing, the closed insulating housing 26 is housed in the conductive housing 24. Gas filled in the insulating housing 26 and gas filled in the conductive housing 24 are separated, and means for supporting the insulating housing 26 and means for reinforcing a withstand voltage of the insulating housing 26 are provided. Thus, when closing and opening the fixed contact and the movable contact, operation can be taken while making the insulating housing stable, and usage of gas filled in the insulating housing 26 can be reduced in comparison with a conventional gas-blast circuit breaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker and, more particularly, to an arc-extinguishing gas while maintaining a high arc-extinguishing ability of an arc generated when a movable contact section is separated from a fixed contact section. The present invention relates to a gas circuit breaker having a reduced amount of use.

[0002]

2. Description of the Related Art A gas circuit breaker shuts off a high current in order to protect a power transmission system and a distribution system in the event of a ground fault or a short circuit between lines. Many puffer-type fuel cells having excellent shutoff capability are used in power plants, and the configuration is shown in FIG.

[0003] This gas circuit breaker is formed as a double cylinder with a long cylindrical conductive vessel 1 called a tank type and an insulating vessel 3 having both ends opened and an intermediate portion connected by a pole insulating cylinder 2. In addition, an arc-extinguishing gas having a high insulating property and arc-extinguishing property, for example, SF ₆ gas, is sealed in the double cylinder, and the fixed contact part 4 and the movable contact part 5 are arranged so as to face each other. Has become.

The fixed contact portion 4 includes a fixed current-carrying contact 7 and a fixed arc contact 8 fixed to the end surface conductor 6a of the insulating container 3. In addition, the end surface conductor 6a is provided with a fixed current-carrying contact 7 formed in a cylindrical shape to form a space 9 between the end surface conductor 6a and the insulating container 3 and a passage 1 for escaping SF ₆ gas or the like.
0 is formed.

On the other hand, the movable contact portion 5 includes a movable cylinder 11 housed in the insulating container 3 and a movable arc contact 1 housed in the movable cylinder 11 and having a finger-shaped tip.
2 and a hollow operating rod 13 provided with an insulating nozzle 1 concentrically surrounding the outside of the movable arc contact 12.
4, a movable electrical contact 14 a that abuts on the outside of the nozzle 14 and concentrically surrounds the nozzle 14, and a piston 15 that is fixed with respect to the advance and retreat of the movable cylinder 11.

The piston 15 is provided with a piston support 16
When the movable cylinder 11 and the operating rod 13 are integrally moved forward and backward, the SF ₆ gas is compressed in a compression chamber (puffer chamber) 18 in the movable cylinder 11. It has become.

The hollow operation rod 13 extends long along the inside of the supporting insulating cylinder 18 provided on the end surface conductor 6b of the insulating container 3, and the driving unit (not shown) is provided with the insulating rod 19 interposed in the middle. ) Is connected to the drive shaft 20 and shields 21a for shielding leakage current generated during operation.
21b. In addition, the end surface conductor 6 of the insulating container 3
a and 6b are provided with connection conductors 22a and 22b for conducting to a control circuit (not shown).

In the gas circuit breaker having the above configuration, when the opening command is input, the operating rod 13 and the movable cylinder 1
1 to move the movable arc contact 12 away from the fixed arc contact 8. Fixed arc contact 8 with opening
An arc is generated between the movable arc contact 12 and the movable arc contact 12. In the meantime, the piston 15 moves in the compression chamber (puffer chamber) 2 with the movement of the operating rod 13 and the movable cylinder 11.
The pressure of SF ₆ gas in 3 is increased. When the gas pressure of the SF ₆ gas is sufficiently increased and the stroke of the insulating nozzle 14 is sufficiently long, the SF ₆ gas in the compression chamber 23 flows toward the arc and starts extinguishing the arc.

During the extinction of the arc, the gas circuit breaker moves the operating rod 13 and the movable cylinder 11 faster, during which the SF ₆ gas is pressurized by the compression force of the piston 15, and the high-pressure gas is continuously discharged. To extinguish the arc reliably and terminate the arc-extinguishing motion.

As described above, the conventional gas circuit breaker utilizes the SF ₆ gas, which has excellent arc extinguishing properties and insulating properties, to reliably extinguish the arc and to quickly restart the power system. Was being dealt with.

[0011]

Recently, as awareness of global environmental protection has increased on a global level, the so-called global warming potential (GWP) of SF ₆ gas used for gas circuit breakers has been increasing.
bal Warming Potentials has attracted attention, and was designated as a regulatory factor at the International Kyoto Conference on Global Warming Prevention (COP3) as a factor in global warming. This SF ₆ gas is currently C
Although the consumption itself is smaller than O ₂ gas, CO ₂
If the set to 1 the global warming potential, its SF ₆ gas is made to 24900.

As described above, even if SF ₆ gas has a remarkably high global warming potential, considering the arc extinguishing ability and insulating ability, arc-extinguishing gas instead of SF ₆ gas is presently available. I can't find it. For this reason, recent gas circuit breakers
To the design, to take advantage of SF ₆ gas more effectively, the improvement in the structure surface addition, SF ₆ as a result
There is a strong demand for measures to protect the global environment by reducing the amount of gas used.

The present invention has been made based on the demands of the world level as described above. When extinguishing an arc, the amount of the arc-extinguishing gas used is reduced while maintaining high extinguishing ability and insulating ability. It is an object of the present invention to provide a gas circuit breaker having a reduced number.

[0014]

According to a first aspect of the present invention, there is provided a gas circuit breaker in which an insulating container having both ends opened in a conductive container is provided. At the same time, in a gas circuit breaker in which a fixed contact portion and a movable contact portion are housed facing each other in this insulating container, both ends of the insulating container are closed and formed in a closed state, and the closed state is formed. While enclosing the arc-extinguishing gas in the formed insulating container, separate one of the arc-extinguishing gas and the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas into the conductive container. Filled.

According to another aspect of the present invention, there is provided a gas circuit breaker, comprising: an arc-extinguishing gas filled in an insulating container; and an arc-extinguishing gas filled in a conductive container. Either one of the gas and the mixed gas obtained by adding the gas with low global warming potential to the arc-extinguishing gas is 1
The pressure is equal to or higher than the atmospheric pressure.

Further, in order to achieve the above object, a gas circuit breaker according to the present invention is characterized in that the arc-extinguishing gas is SF ₆ gas.

Further, in order to achieve the above object, a gas circuit breaker according to the present invention, wherein the gas having a low global warming potential is nitrogen gas, argon gas, helium gas, carbon dioxide. And at least one of oxygen gas.

Further, in order to achieve the above object, a gas circuit breaker according to the present invention, as described in claim 5, the insulating container is made of a fiber reinforced plastic material.

Further, in order to achieve the above object, a gas circuit breaker according to the present invention, as set forth in claim 6, accommodates an insulating container having both ends opened in a conductive container. In the container, in the gas circuit breaker in which the fixed contact portion and the movable contact portion are accommodated facing each other, both ends of the insulating container are closed and formed in a sealed state, and the insulating container formed in the sealed state is closed. While encapsulating the arc-extinguishing gas, while filling one of the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas and the arc-extinguishing gas to the conductive container, The insulating container is provided with fixing means.

Further, in order to achieve the above object, according to the gas circuit breaker according to the present invention, the fixing means comprises an insulating container having an insulating conductor provided on an end surface conductor of the insulating container. It is a spacer.

Further, in order to achieve the above object, the gas circuit breaker according to the present invention is characterized in that the fixing means is an insulating support provided at the bottom of the insulating container. Is what you do.

Further, in order to achieve the above object, the gas circuit breaker according to the present invention, as described in claim 9, wherein the fixing means is provided between the end surface conductor of the insulating container and the conductive container, It is an insulating support cylinder surrounding the operation rod.

According to the gas circuit breaker of the present invention, in order to achieve the above object, an insulating container having both ends opened in a conductive container is provided. In the container, in the gas circuit breaker in which the fixed contact portion and the movable contact portion are accommodated facing each other, both ends of the insulating container are closed and formed in a sealed state, and the insulating container formed in the sealed state is closed. While encapsulating the arc-extinguishing gas, while filling one of the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas and the arc-extinguishing gas to the conductive container, A corrugated portion is formed on the outer surface of the insulating container.

According to the gas circuit breaker of the present invention, in order to achieve the above object, an insulating container having both ends opened in a conductive container is provided. In the container, in the gas circuit breaker in which the fixed contact portion and the movable contact portion are accommodated facing each other, both ends of the insulating container are closed and formed in a sealed state, and the insulating container formed in the sealed state is closed. While encapsulating the arc-extinguishing gas, while filling one of the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas and the arc-extinguishing gas to the conductive container, A porcelain tube portion in which a cap portion is covered with a jacket is formed on the outer surface of the insulating container.

Further, in order to achieve the above object, the gas circuit breaker according to the present invention, both the cap portion and the outer cover are made of a polymer material.

According to the gas circuit breaker of the present invention, in order to achieve the above object, an insulating container having both ends opened is housed in a conductive container. In the container, in the gas circuit breaker in which the fixed contact portion and the movable contact portion are accommodated facing each other, both ends of the insulating container are closed and formed in a sealed state, and the insulating container formed in the sealed state is closed. While encapsulating the arc-extinguishing gas, while filling one of the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas and the arc-extinguishing gas to the conductive container, An optical pressure gauge is provided in the insulating container.

Further, in order to achieve the above object, a gas circuit breaker according to the present invention, as described in claim 14, an optical applied pressure gauge is a combination of a sensor constituted by a diaphragm and an optical fiber cable. It is.

According to the gas circuit breaker of the present invention, in order to achieve the above object, an insulating container having both ends opened in a conductive container is accommodated in the conductive container. In the container, in the gas circuit breaker in which the fixed contact portion and the movable contact portion are accommodated facing each other, both ends of the insulating container are closed and formed in a sealed state, and the insulating container formed in the sealed state is closed. While encapsulating the arc-extinguishing gas, while filling one of the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas and the arc-extinguishing gas to the conductive container, An arc-extinguishing gas supply / discharge means for supplying / discharging the arc-extinguishing gas from the outside of the conductive container to the insulating container is provided.

Further, in order to achieve the above object, the gas circuit breaker according to the present invention, the arc extinguishing gas supply / discharge means is provided on the bottom side of the insulating container. .

Further, in order to achieve the above object, a gas circuit breaker according to the present invention comprises an arc extinguishing gas supply / discharge means including an operating rod for driving a movable contact portion and an insulating rod. It is provided by covering the rod.

Further, in order to achieve the above object, the gas circuit breaker according to the present invention is characterized in that the arc-extinguishing gas supply / discharge means is an insulating cylinder. It is.

Further, in order to achieve the above object, a gas circuit breaker according to the present invention, as set forth in claim 19, accommodates an insulating container having both ends opened in a conductive container. In the container, in the gas circuit breaker in which the fixed contact portion and the movable contact portion are accommodated facing each other, both ends of the insulating container are closed and formed in a sealed state, and the insulating container formed in the sealed state is closed. While encapsulating the arc-extinguishing gas, while filling one of the mixed gas obtained by adding a gas having a low global warming potential to the arc-extinguishing gas and the arc-extinguishing gas to the conductive container, A pressure detector is provided in the conductive container.

[0033]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gas circuit breaker according to an embodiment of the present invention.

FIG. 1 is a schematic cross-sectional view showing a first embodiment of the gas circuit breaker according to the present invention.

In the gas circuit breaker according to the present embodiment, both ends are placed in endless conductors 25a, 25b in a horizontally long tubular conductive container 24.
The insulating container 26 which is closed and formed in a sealed state is concentrically arranged and accommodated in a double cylinder, and the fixed contact portion 27 and the movable contact portion 28 are accommodated in the insulating container 26 so as to face each other. It has a configuration.

The fixed contact portion 27 is a closed insulating container 26.
Fixed electric contact 2 fixed to end conductor 25a
9 and a fixed arc contact 30 and a connection conductor 31 that is connected to the end surface conductor 25a of the insulating container 26 and conducts to a control circuit (not shown).

Further, the conductive container 24, arc extinguishing gas, eg SF ₆ gas or SF ₆ gas low global warming potential to the gas, such as nitrogen gas, argon gas, helium gas, oxygen gas and carbon dioxide Among them, a mixed gas to which at least one kind of gas is added is filled at a pressure of 1 atm or more, and an arc-extinguishing gas, for example, SF ₆ gas is separated at a pressure of 1 atm or more in the insulating container 26. It is enclosed. The inside of the conductive container 24 may be maintained in a vacuum state.

On the other hand, the movable contact portion 28 includes a movable cylinder 32 accommodated in a closed insulating container 26, and a movable arc contact 33 accommodated in the movable cylinder 32 and having a finger-shaped tip. A hollow operating rod 34, an insulating nozzle 35 concentrically surrounding the outside of the movable arc contact 33, an abutting outside of the nozzle 35,
And a piston 36 fixed concentrically with respect to the movable cylinder 32.

Further, the piston 36 is
When the movable cylinder 32 and the operating rod 34 move forward and backward integrally, the SF ₆ gas is compressed in a compression chamber (puffer chamber) 39 in the movable cylinder 32. It is made to let.

The hollow operating rod 34 is provided with a sealing portion 40 provided on the end surface conductor 25b of the closed insulating container 26.
Are extended long by being inserted, and provided on the outside of the conductive container 24 with an insulating rod 41 interposed on the way, and connected to a drive shaft 42 of a drive unit (not shown). Note that a seal portion 43 is provided on the conductive container 24 through which the drive shaft 42 is inserted. Further, each of the hollow operation rod 34 and the insulating rod 41 is provided with shield portions 44a, 44b
To shield leakage current generated during operation. Furthermore, the end surface conductor 2 of the insulating container 26
5b includes a connection conductor 45 which is electrically connected to a control circuit (not shown).
Is provided.

In the gas circuit breaker having such a configuration, when there is an opening command, the operating rod 34 moves together with the movable cylinder 32, the movable arc contact 33, the nozzle 35, and the movable energizing contact 35a. The contact 28 is separated from the fixed contact 27. At the time of separation, an arc is generated between the movable contact portion 28 and the fixed contact portion 27. During the movement of the movable cylinder 32 of the movable contact portion 28, S
F ₆ gas is compressed by a piston 36 which is fixed through the piston support 37 to the conductive cylindrical body 38, is high pressure in the compression chamber (puffer chamber) 39, SF ₆ gas which is high pressure in the compression chamber 39 Is applied to the arc to extinguish the arc.

By the way, the insulating container 26 according to the present embodiment, which accommodates the fixed contact portion 27 and the movable contact portion 28,
Both ends are in a sealed state closed by end face conductors 25a and 25b. In a closed state, the gas circuit breaker
A high current is applied to the fixed contact portion 27 and the movable contact portion 28, and a high voltage is applied to the arc generated between the fixed contact portion 27 and the movable contact portion 28 during opening. SF
_Six gases are being introduced. For this reason, it is necessary to select an appropriate material for the insulating container 26 according to the present embodiment that withstands a high current and also withstands the impact force of the high-pressure SF ₆ gas.

In the present embodiment, in consideration of such points, a fiber reinforced plastic material manufactured by, for example, a filament winding method is selected when manufacturing the insulating container 26. The fiber reinforced plastic material produced by this filament winding method, gas fibers impregnated with resin in advance are wound in layers,
After the resin is cured, it is formed on a cylindrical body. In addition, if the fiber-reinforced plastic material has voids or voids, the electrical characteristics deteriorate, so in this case, impregnate the fat in a vacuum and heat and cure, or select a glass fiber with good wettability to the resin. Alternatively, a glass fiber which has been subjected to a surface treatment for improving wettability may be selected.

As described above, in the present embodiment, both ends of the insulating container 26 accommodating the fixed contact portions 27 and the movable contact portions 28 are formed in a sealed state in which both ends are closed by the end surface conductors 25a and 25b.
The sealed insulating container 26 is housed in a conductive container 24, and the conductive container 24 is filled with SF ₆ gas or a mixed gas obtained by adding another gas to SF ₆ gas, and the insulating container 26 is filled with SF ₆ gas. Is sealed and separated from each other, and a fiber reinforced plastic material is selected and manufactured for the insulating container 26 to enhance the dielectric breakdown resistance, so that the arc extinguishing ability and the insulating ability are maintained at a high level during the arc extinguishing operation. Can SF
₆ The amount of gas used can be reduced.

Further, in the present embodiment, the insulating container 26 accommodating the fixed contact portion 27 and the movable contact portion 28 is hermetically sealed to reduce the size and facilitate the transfer into and out of the conductive container 24. In case of repair, inspection, etc., it can be taken back to the factory and the work can be performed quickly. At that time, the insulating container 26
The SF ₆ gas encapsulated in the substrate can be appropriately processed, and the emission of SF ₆ gas to the atmosphere can be reduced.

FIG. 2 is a schematic cross-sectional view showing a second embodiment of the gas circuit breaker according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

In the gas circuit breaker according to the present embodiment, the insulating spacer 46 is grounded to the connection conductor 31 that is connected to the end surface conductor 25a of the insulating container 26, and the insulating container 2 is
6 is fixed. The other components are the same as the components of the first embodiment, and the description is omitted.

As described above, in the present embodiment, the insulating container 2
Because through the connection conductor 31 provided on the end face conductor 25a of 6 is fixed by an insulating spacer 46, extinguishing time of arc operation, the insulating container even if an impact force of the high pressure has been SF ₆ gas charged into an arc is generated 26 can be maintained in a stable state.
In the present embodiment, the insulating container 26 is fixed by the insulating spacer 46 via the connection conductor 31.
For example, as shown in FIG. 3, an insulating support 47 may be provided at the bottom of the conductive container 24 to support the insulating container 26. Further, for example, as shown in FIG. An insulating support tube 48 surrounding the operation rod 34 may be provided between the conductive container 25b and the conductive container 24, and the insulating container 26 may be fixed by the insulating support tube 48.

FIG. 5 is a schematic cross-sectional view showing a third embodiment of the gas circuit breaker according to the present invention. The same parts as those of the first embodiment are denoted by the same reference numerals.

The gas circuit breaker according to the present embodiment has a corrugated portion 4 on the outer surface of an insulating container 26 mounted in a conductive container 24.
9 is formed.

As described above, in this embodiment, the insulating container 2
6, a corrugated portion 49 is formed on the outer surface, and the surface area of the insulating container 26 is further increased to increase the withstand voltage of the insulating container 26. Therefore, the poles between the fixed contact portion 27 and the movable contact portion 28 are closed. Sufficiently cope with the dielectric breakdown caused by the high current flowing therein, and also the dielectric breakdown caused by the impact force generated when the SF ₆ gas is applied to the arc at a high pressure during opening. be able to. In order to increase the withstand voltage of the insulating container 26, for example, as shown in FIG. 6, a cap portion 50 made of a polymer material is formed on the outer surface of the insulating container 26 along the axial direction thereof. A porcelain tube portion 52 in which a jacket 51 made of a polymer material is covered may be provided in the portion 50.

FIG. 7 is a schematic cross-sectional view showing a fourth embodiment of the gas circuit breaker according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

In the gas circuit breaker according to the present embodiment, an optical applied pressure gauge 53 is installed in an insulating container 26, and the optical applied pressure gauge 53 is provided.
The pressure in the vessel is monitored by the optical signal detected in step (1).

The optical applied pressure gauge 53 includes a sensor 54 such as a diaphragm and an optical fiber cable 55. When the SF ₆ gas in the insulating container 26 fluctuates, the fluctuation is detected by the sensor 54, and the detected signal is detected. Fluctuations in the internal pressure can be monitored via the optical fiber cable 55.

As described above, in the present embodiment, the insulating container 2
Since the optical applied pressure gauge 53 is installed in the chamber _{6 and} the pressure fluctuation of the SF ₆ gas in the vessel is monitored, even if the pressure of the SF ₆ gas becomes an abnormal pressure for some reason, it is possible to quickly take measures.
The dielectric breakdown of the insulating container 26 can be suppressed low.

FIG. 8 is a schematic cross-sectional view showing a fifth embodiment of the gas circuit breaker according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

The gas circuit breaker according to this embodiment is provided with an insulating tube 56 for supplying or discharging SF ₆ gas from the outside of the conductive container 24 to the bottom side of the insulating container 26 or for replenishing the gas.

As described above, in the present embodiment, since the insulating tube 56 for supplying or discharging or replenishing SF ₆ gas is provided from the outside of the conductive container 24 to the inside of the insulating container 26, the movable contact with the fixed contact portion 27 is provided. The internal pressure can be maintained at an appropriate value even during closing or opening of the insulating container 2 and the insulating container 2.
6 can be operated in a stable state. In order to supply or discharge or replenish the SF ₆ gas from the outside of the conductive container 24 to the inside of the insulating container 26, for example, as shown in FIG. 9, the operation rod 34, the shield portions 44 a and 44 b, and the insulating rod 41 are surrounded. The insulating tubular body 56 formed and having a wider space portion of the insulating container 26 may be provided on the end surface conductor 25b of the insulating container 26. This is effective in that the insulating container 26 can be securely fixed and the withstand voltage of the insulating rod 41 is improved.

FIG. 10 shows a sixth embodiment of the gas circuit breaker according to the present invention.
1 is a schematic cross-sectional view showing an embodiment. The same components as those of the first embodiment are denoted by the same reference numerals.

In the gas circuit breaker according to the present embodiment, a pressure detector 57 is provided in the conductive container 24, the internal pressure of the conductive container 24 is detected by the pressure detector 57, Was monitored for leakage of SF ₆ gas.

[0061] Thus, in the present embodiment, the conductive container 24 is provided the pressure detector 57, so was monitored SF ₆ gas insulated container 26, faster even SF ₆ gas leak from the insulated container 26 The fixed contact part 2
Upon closing or opening of the movable contact portion 7 and the movable contact portion 28, the insulating container 26 can be operated in a stable state.

[0062]

As described above, in the gas circuit breaker according to the present invention, the fixed contact portion and the movable contact portion are accommodated in the hermetically sealed insulating container, and the hermetically sealed insulating container is formed. In a conductive container, the gas to be filled in the insulating container and the gas to be filled in the conductive container are separated from each other, while the means for supporting the insulating container and the means for strengthening the withstand voltage of the insulating container are provided. When closing or opening the contact portion and the movable contact portion, the insulating container can be operated in a stable state, and the amount of gas to be filled in the insulating container can be reduced as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of a gas circuit breaker according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a second embodiment of the gas circuit breaker according to the present invention.

FIG. 3 is a schematic cross-sectional view showing a first modification of the gas circuit breaker according to the second embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view showing a second modification of the gas circuit breaker according to the second embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing a third embodiment of the gas circuit breaker according to the present invention.

FIG. 6 is a schematic cross-sectional view showing a modification of the gas circuit breaker according to the third embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view showing a fourth embodiment of the gas circuit breaker according to the present invention.

FIG. 8 is a schematic cross-sectional view showing a fifth embodiment of the gas circuit breaker according to the present invention.

FIG. 9 is a schematic cross-sectional view showing a modification of the gas circuit breaker according to the fifth embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view showing a sixth embodiment of the gas circuit breaker according to the present invention.

FIG. 11 is a schematic cross-sectional view showing a conventional gas circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive container 2 Insulated cylinder between poles 3 Insulating container 4 Fixed contact part 5 Movable contact part 6a End conductor 6b End conductor 7 Fixed energizing contact 8 Fixed arc contact 9 Space part 10 Passage 11 Movable cylinder 12 Movable arc contact Element 13 Operating rod 14 Nozzle 14a Movable energizing contact 15 Piston 16 Piston support 17 Conductive cylinder 18 Support insulating cylinder 19 Insulating rod 20 Drive shaft 21a Shield 21b Shield 22a Connection conductor 22b Connection conductor 23 Compression chamber 24 Conductivity Container 25a End conductor 25b End conductor 26 Insulating container 27 Fixed contact part 28 Movable contact part 29 Fixed energizing contact 30 Fixed arc contact 31 Connection conductor 32 Movable cylinder 33 Movable arc contact 34 Operation rod 35 Nozzle 35a Movable electric Contact 36 Piston 37 Piston Supporting part 38 Conductive cylindrical body 39 Compression chamber 40 Sealing part 41 Insulating rod 42 Drive shaft 43 Sealing part 44a Shielding part 44b Shielding part 45 Connection conductor 46 Insulating spacer 47 Insulating support 48 Insulating support cylinder 49 Wave part 50 Shade part 51 Outside 52 covered insulator 53 optical pressure gauge 54 sensor 55 optical fiber cable 56 insulating cylinder 57 pressure detector

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsumi Suzuki, Inventor 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Yoshihiko Hirano No. 2, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 F-term in Toshiba Hamakawasaki Plant (reference) 5G001 AA06 BB04 BB07 CC03 DD03 EE01 FF04 GG01 GG16 GG17 5G017 DD12 DD14

Claims (19)

[Claims] 1. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container, and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. In the above, both ends of the insulating container are closed to form a sealed state, and the arc-extinguishing gas is sealed in the insulating container formed in a closed state, and the arc-extinguishing gas and the arc-extinguishing gas are filled in the conductive container. A gas circuit breaker characterized in that one of a mixed gas to which a gas having a low global warming coefficient has been added is separately charged. 2. An arc-extinguishing gas filled in an insulating container or an arc-extinguishing gas filled in a conductive container or a mixed gas obtained by adding a gas having a low global warming potential to an arc-extinguishing gas. The gas circuit breaker according to claim 1, wherein both of the pressures are 1 atm or more. 3. The gas circuit breaker according to claim 1, wherein the arc-extinguishing gas is SF ₆ gas. 4. The gas according to claim 1, wherein the gas having a low global warming potential is at least one or more of nitrogen gas, argon gas, helium gas, carbon dioxide, and oxygen gas. Gas circuit breaker. 5. The gas circuit breaker according to claim 1, wherein the insulating container is made of a fiber reinforced plastic material. 6. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container, and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. The two ends of the insulating container are closed to form a sealed state, the sealed container is filled with an arc-extinguishing gas, and the conductive container is filled with an arc-extinguishing gas and an earth-extinguishing gas. A gas circuit breaker, characterized in that one of a mixed gas to which a gas with a low global warming coefficient is added is filled separately and fixing means is provided in the insulating container. 7. The gas circuit breaker according to claim 6, wherein the fixing means is an insulating spacer having a connecting conductor provided on an end surface conductor of the insulating container. 8. The gas circuit breaker according to claim 6, wherein the fixing means is an insulating support provided on a bottom of the insulating container. 9. The gas circuit breaker according to claim 6, wherein the fixing means is an insulating support cylinder provided between the end surface conductor of the insulating container and the conductive container and surrounding the operation rod. . 10. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container, and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. The two ends of the insulating container are closed to form a sealed state, the sealed container is filled with an arc-extinguishing gas, and the conductive container is filled with an arc-extinguishing gas and an earth-extinguishing gas. A gas circuit breaker, characterized in that a gas mixture having a low global warming coefficient added thereto is filled with one of the mixed gases separately, and a corrugated portion is formed on the outer surface of the insulating container. 11. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container, and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. The two ends of the insulating container are closed to form a sealed state, the sealed container is filled with an arc-extinguishing gas, and the conductive container is filled with an arc-extinguishing gas and an earth-extinguishing gas. A gas mixture having a low global warming coefficient added thereto, one of which is separated and filled, and a porcelain tube portion in which a cap is covered with a jacket is formed on the outer surface of the insulating container. Gas circuit breaker. 12. The gas circuit breaker according to claim 11, wherein both the cap portion and the outer cover are made of a polymer material. 13. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container, and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. The two ends of the insulating container are closed to form a sealed state, the sealed container is filled with an arc-extinguishing gas, and the conductive container is filled with an arc-extinguishing gas and an earth-extinguishing gas. A gas circuit breaker, characterized in that one of a mixed gas to which a gas with a low global warming coefficient has been added is charged separately, and an optical pressure gauge is provided in the insulating container. 14. The gas circuit breaker according to claim 13, wherein the optical applied pressure gauge combines a sensor formed of a diaphragm and an optical fiber cable. 15. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container, and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. The two ends of the insulating container are closed to form a sealed state, the sealed container is filled with an arc-extinguishing gas, and the conductive container is filled with an arc-extinguishing gas and an earth-extinguishing gas. An arc-extinguishing gas supply / discharge for supplying / discharging an arc-extinguishing gas to / from the insulating container from the outside of the conductive container while filling one of the mixed gases to which a gas having a low global warming coefficient is added separately. A gas circuit breaker provided with a means. 16. The gas circuit breaker according to claim 15, wherein the arc-extinguishing gas supply / discharge means is provided on a bottom side of the insulating container. 17. The gas circuit breaker according to claim 15, wherein the arc-extinguishing gas supply / discharge means is provided so as to cover an operation rod for driving the movable contact portion and an insulating rod. 18. The gas circuit breaker according to claim 15, wherein the arc-extinguishing gas supply / discharge means is an insulating cylinder. 19. A gas circuit breaker in which an insulating container having both ends opened is accommodated in a conductive container and a fixed contact portion and a movable contact portion are accommodated in the insulating container so as to face each other. The two ends of the insulating container are closed to form a sealed state, the insulating container formed in a closed state is filled with an arc-extinguishing gas, and the conductive container is filled with an arc-extinguishing gas and an earth-extinguishing gas. A gas circuit breaker, characterized in that one of the mixed gases to which a gas with a low global warming coefficient is added is charged separately, and a pressure detector is provided in the conductive container.