JP6996525B2 - Gas insulation switching equipment - Google Patents

Description

The present invention relates to a gas-insulated opening / closing device that supplies and shuts off electric power by performing an opening / closing operation. In particular, the present invention relates to a gas-insulated switching device using an insulating gas containing carbon (C) such as carbon dioxide (CO ₂ gas).

In the conventional gas-insulated opening / closing device, two electrodes that can be mechanically separated from each other are arranged in an insulating gas filled in a closed container, and energization is performed by connecting these electrodes to separate these electrodes. By letting it cut off the current. If an arc discharge occurs between the electrodes when the current is cut off, an insulating gas is blown onto the arc discharge to extinguish the arc discharge and perform current cutoff.
When CO ₂ gas is used as the insulating gas, the CO ₂ gas is decomposed by the arc discharge generated between the electrodes, and fine particle carbon is generated. This carbon is a conductive substance, and when it adheres to an insulating component, particularly an insulating nozzle, the electrical insulation of the adhered portion may be significantly deteriorated.
In order to suppress such deterioration of insulation, an oxidant gas holding means in which an oxidant gas is sealed inside a gas-insulated opening / closing device is provided, and the oxidant gas is released when the current is cut off to oxidize carbon and gasify it. By doing so, it is possible to prevent carbon from adhering to the insulating nozzle or the like (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-721666

As described above, in the conventional gas-insulated switchgear, the amount of carbon adhering to the insulating component can be reduced by releasing the oxidant gas when the current is cut off to oxidize and gasify the carbon. However, unreacted carbon exists in the generated carbon and adheres to the inside of the gas-insulated opening / closing device.
Further, when the electrode connection operation and the opening / detachment operation of the gas-insulated switching device are repeated, unreacted carbon is accumulated inside the gas-insulated switching device. Further, there is a problem that unreacted carbon is diffused by the air flow of the insulating gas and adheres to the insulating component to reduce the electrical insulation property during the connection operation of the electrodes of the gas-insulated switching device.

The present invention has been made to solve these problems, and an object of the present invention is to provide a gas-insulated switching device that reduces carbon adhesion to insulating parts and maintains high electrical insulation. It is to be.

The gas-insulated switching device according to the present invention includes a conductive fixed electrode, a movable electrode that operates on the axis of the fixed electrode and can be brought into contact with and separated from the fixed electrode, and a movable electrode in a tank filled with insulating gas. A movable side housing that is interlocked and surrounds the axis, a support cylinder that supports the movable side housing, a piston that forms a mechanical puffer chamber with the movable side housing, and a spout that ejects the insulating gas in the mechanical puffer chamber. And, the first intake port for sucking the insulating gas into the mechanical puffer chamber, the second intake port passing through the inside and the outside of the support cylinder, and the insulating gas taken in from the second intake port are filtered. Equipped with a filter .
Further, when the fixed electrode and the movable electrode are separated from each other and the fixed electrode and the movable electrode are connected to each other, the insulating gas filtered by the filter is sucked in from the first intake port and fixed. When the fixed electrode and the movable electrode change from the connected state to the movable electrode, the insulating gas taken in from the ejection port is ejected.

INDUSTRIAL APPLICABILITY According to the present invention, a gas-insulated switching device that maintains high electrical insulation and has high reliability even after repeated operation is provided.

It is sectional drawing of the closed state of the gas insulation switching apparatus 100 which concerns on Embodiment 1 of this invention. FIG. 3 is a cross-sectional view of the position of the alternate long and short dash line C1 shown in FIG. 1 of the gas-insulated switching device 100. FIG. 3 is a cross-sectional view of the position of the alternate long and short dash line C2 shown in FIG. 1 of the gas-insulated switching device 100. It is sectional drawing at the time of opening pole operation of a gas insulation switching apparatus 100. It is sectional drawing of the open state after completion of the opening operation of a gas insulation switching apparatus 100. It is sectional drawing which is in the closed pole operation of the gas insulation switching apparatus 100. It is sectional drawing of the closed state after the closing operation of a gas insulation switching apparatus 100 is completed. It is sectional drawing in the closed pole operation of the gas insulation opening / closing device 101 which concerns on Embodiment 2 of this invention. It is sectional drawing in the opening operation around the insulation nozzle 26 of the gas insulation switching apparatus 102 which concerns on Embodiment 3 of this invention. It is sectional drawing in the opening operation around the insulation nozzle 27 of the gas insulation switching apparatus 103 which concerns on Embodiment 4 of this invention.

Embodiment 1.
1 to 7 show the first embodiment for carrying out the present invention.
The structure of the gas-insulated switchgear 100 according to the first embodiment for carrying out the present invention will be described with reference to FIGS. 1 to 3, and gas insulation will be described with reference to FIGS. 1 and 4 to 7. The opening and closing operations of the opening / closing device 100 will be described.

First, the structure of the gas-insulated switching device 100 according to the first embodiment will be described with reference to FIGS. 1 to 3.
FIG. 1 is a cross-sectional view of a gas-insulated opening / closing device 100 according to a first embodiment for carrying out the present invention in a closed state, and shows a cross-sectional view of a surface including an axis A, which will be described later. As will be described later, FIG. 1 also describes a portion showing a perspective view of the inside 1n of the tank 1 from a direction perpendicular to the axis A. FIG. 2 is a cross-sectional view of the gas-insulated opening / closing device 100 in a direction parallel to the axis A at the position shown by the alternate long and short dash line C1 shown in FIG. It is sectional drawing of the gas insulation opening / closing device 100 in the direction parallel to.

As will be described later, the closed state of the gas-insulated opening / closing device 100 means that the movable arc electrode 21 and the fixed arc electrode 31 configured to be detachable are combined and electrically connected, and the movable portion 2 described later is provided. Indicates a stopped state. Further, the open state of the gas-insulated opening / closing device 100 indicates a state in which the movable arc electrode 21 and the fixed arc electrode 31 are separated from each other, electrically insulated, and the movable portion 2 is stopped. Further, the opening operation of the gas-insulated opening / closing device 100 means an operation of shifting from the closed state to the open state, and the closing operation of the gas-insulated opening / closing device 100 means an operation of shifting from the open state to the closed state.
Further, the current cutoff means to cut off the current flowing between the movable arc electrode 21 and the fixed arc electrode 31 by the opening operation. If an arc discharge E is generated between the movable arc electrode 21 and the fixed arc electrode 31 during the opening operation, the arc discharge E is extinguished and between the movable arc electrode 21 and the fixed arc electrode 31. It means to cut off the flowing current.

With reference to FIG. 1, the tank 1 is made of a cylindrical metal or the like and is generally electrically grounded. The inside 1n of the tank 1 is filled with an insulating gas such as CO ₂ gas.
The drive rod 23 is connected to the drive mechanism 6. Further, the drive rod 23 is driven and operated by the drive mechanism 6 on the axis A of the fixed arc electrode 31 shown by the alternate long and short dash line. In other words, the axis A is a flow line of the movable arc electrode 21 when the fixed arc electrode 31 and the movable arc electrode 21 are connected and disconnected, and is an extension of this flow line. The drive rod 23 and the drive mechanism 6 are configured to be electrically insulated.

A movable arc electrode 21 is arranged on the rod head 23h at the tip of the drive rod 23, and the movable arc electrode 21 and the drive rod 23 are electrically connected to each other. Further, an insulating movable energizing contact 22 is arranged on the rod head 23h so as to cover the movable arc electrode 21. Further, an insulating insulating nozzle 25 is arranged at the tip of the movable energizing contact 22 so as to surround the fixed arc electrode 31.
Further, the cylindrical puffer cylinder 24 is arranged so as to surround the drive rod 23, and one end of the puffer cylinder 24 is attached to the rod head 23h. In other words, the puffer cylinder 24 is arranged so as to surround the axis A and interlocks with the movable arc electrode 21.
The movable arc electrode 21, the movable energizing contact 22, the drive rod 23, the puffer cylinder 24, and the insulating nozzle 25 constitute the movable portion 2. The movable portion 2 is driven by the drive mechanism 6 to operate.

The cylindrical support cylinder 41 meshes with the puffer cylinder 24 to support the operation of the movable portion 2. Further, the support cylinder 41 is formed with a second intake port 41p that allows the inside and the outside of the support cylinder 41 to communicate with each other. Further, the filter 41f is arranged so as to cover the second intake port 41p.
Further, the fixed piston 42 is arranged in the cylinder of the support cylinder 41. The support cylinder 41 and the fixed piston 42 form a support portion 4. The side surface 41d of the support cylinder 41 is a part of the above-mentioned perspective view.
Further, the space surrounded by the piston head 42h of the fixed piston 42 and the wall surface of the puffer cylinder 24 forms the mechanical puffer chamber Mp. Further, as will be described later, the volume of the mechanical puffer chamber Mp is configured to be compressed when the gas-insulated opening / closing device 100 executes the opening operation.

Further, the support portion 4 is supported by the insulating movable portion side spacer 72 and fixed to the tank 1. Further, the support cylinder 41 is electrically connected to one end of the movable portion side conductor 52. Further, the movable portion side conductor 52 is supported by an insulating conductor spacer 74 so as not to come into contact with the tank 1, and the other end of the movable portion side conductor 52 is connected to a first terminal (not shown). The movable portion side spacer 72 is a portion of the above-mentioned perspective view.

The fixed arc electrode 31 is fixed to the conductive fixed current-carrying plate 33 and is also electrically connected. Further, the fixed energizing plate 33 is fixed to the conductive fixed energizing contact 32 and is electrically connected.
The fixed arc electrode 31, the fixed energizing contact 32, and the fixed energizing plate 33 constitute the fixing portion 3. The side surface 32d of the fixed energizing contact 32 is a part of the above-mentioned perspective view.
Further, the fixing portion 3 is supported by the insulating fixing portion side spacer 71 and fixed to the tank 1. Further, the fixed energizing contact 32 is electrically connected to one end of the fixed portion side conductor 51. Further, the fixed portion side conductor 51 is supported by an insulating conductor spacer 73 so as not to come into contact with the tank 1, and the other end of the fixed portion side conductor 51 is connected to a second terminal (not shown). The movable portion side fixing portion side spacer 71 is a portion of the above-mentioned perspective view.

Further, referring to FIG. 2, the piston head 42h is provided with a first intake port 42p so that the inside of the mechanical puffer chamber Mp and the outside of the mechanical puffer chamber Mp communicate with each other, and further, the first intake port 42p is provided with the first intake port 42p. A check valve 43 that opens and closes the first intake port 42p is arranged.
When the pressure inside the machine puffer chamber Mp is higher than the pressure outside the machine puffer chamber Mp communicating through the first intake port 42p, the check valve 43 is opened. Further, when the pressure inside the machine puffer chamber Mp is equal to or less than the pressure outside the machine puffer chamber Mp communicating through the first intake port 42p, the check valve 43 is closed.

Further, referring to FIG. 3, the rod head 23h is provided with a spout 23p so that the inside of the mechanical puffer chamber Mp and the outside of the mechanical puffer chamber Mp communicate with each other.

The fixed arc electrode 31 is an example of the fixed electrode described in the claims, the movable arc electrode 21 is an example of the movable electrode described in the claims, and the puffer cylinder 24 is a patent claim. The fixed piston 42 is an example of the piston described in the claims, and the first intake port 42p is an example of the first intake port described in the claims. The second intake port 41p is an example of the second intake port described in the claims, and the filter 41f is an example of the second filter described in the claims, and is insulated. The nozzle 25 is an example of the insulating nozzle described in the claims.

Next, with reference to FIGS. 1 and 4 to 7, the opening and closing operations of the gas-insulated switching device 100 will be described.
As described above, FIG. 1 shows a cross-sectional view of the gas-insulated opening / closing device 100 in a closed state. FIG. 4 shows a cross-sectional view of the gas-insulated switching device 100 during the opening operation, and FIG. 5 shows a cross-sectional view of the gas-insulated switching device 100 in the opened state after the opening operation is completed.
Further, FIG. 6 shows a cross-sectional view of the gas-insulated switching device 100 during the closing operation, and FIG. 7 shows a cross-sectional view of the gas-insulated switching device 100 in the closed state after the closing operation is completed.

First, the opening operation of the gas-insulated opening / closing device 100 will be described with reference to FIGS. 1 and 4 to 5. Further, the mechanism by which the carbon Pc adheres to the portion of the inside 1n of the tank 1 will be described.
With reference to FIG. 1, the above-mentioned first terminal and the above-mentioned second terminal are connected to an external circuit, a voltage is applied between the first terminal and the second terminal, and a movable arc is applied. It is assumed that a current is flowing between the electrode 21 and the fixed arc electrode 31.

With reference to FIG. 4, the state of the gas-insulated opening / closing device 100 during the opening pole operation will be described.
When the gas-insulated switching device 100 executes the opening operation, the movable portion 2 moves to the left of the paper surface from the closed state in which the movable arc electrode 21 and the fixed arc electrode 31 are in contact with each other, and is fixed to the movable arc electrode 21. The arc electrode 31 is separated from the arc electrode 31 and the state shifts to the open state. At this time, it is assumed that an arc discharge E is generated between the movable arc electrode 21 and the fixed arc electrode 31, and a current flows between the movable arc electrode 21 and the fixed arc electrode 31 via the arc discharge E. ..

Next, the mechanism of current cutoff for extinguishing the arc discharge E will be described.
During the opening operation, the position of the piston head 42h of the fixed piston 42 does not change, and the movable portion 2 moves from the left to the right of the paper surface, so that the volume of the mechanical puffer chamber Mp is compressed. Therefore, the pressure inside the mechanical puffer chamber Mp is higher than the pressure outside the mechanical puffer chamber Mp, and the check valve 43 keeps the closed state. That is, when the check valve 43 is closed, the volume of the mechanical puffer chamber Mp is compressed.
Due to the compression of the volume of the mechanical puffer chamber Mp, the insulating gas in the mechanical puffer chamber Mp generates a gas flow Sm ejected from the ejection port 23p, and the gas flow Sm passes between the movable arc electrode 21 and the insulating nozzle 25. Then, it is sprayed on the arc discharge E. Further, the gas flow Sm is blown to the arc discharge E until the movable portion 2 is stopped. The arc discharge E is extinguished by the gas flow Sm blowing off the ions and electrons of the insulating gas constituting the arc discharge E. That is, the gas insulation switching device 100 performs current cutoff.

With reference to FIG. 5, the state of the gas-insulated switching device 100 after the current cutoff is performed and the pole opening operation is completed will be described.
When CO ₂ gas is used as the insulating gas, the CO ₂ gas is decomposed by the arc discharge generated between the electrodes, and fine particle carbon Pc is generated. The carbon Pc is blown off by the gas flow Sm and adheres to the portion inside 1n of the tank 1. Further, the carbon Pc adheres to the fixed portion 3 which is directly hit by the gas flow Sm as compared with the other internal 1n portions. The carbon Pc shown in FIG. 5 is displayed larger than the portion of the gas-insulated opening / closing device 100 in order to explain the effect of the present invention.

Next, the closing operation of the gas-insulated opening / closing device 100 will be described with reference to FIGS. 5 to 7. Further, a mechanism for suppressing the diffusion of carbon Pc will be described.
As described above, FIG. 5 shows an open state after the completion of the opening operation of the gas-insulated opening / closing device 100, which is the same state as before the closing operation.
With reference to FIG. 6, the state of the gas-insulated opening / closing device 100 during the closed pole operation will be described.
When the gas-insulated switching device 100 executes the closed electrode operation, the movable portion 2 moves to the left of the paper surface from the open state in which the movable arc electrode 21 and the fixed arc electrode 31 are separated from each other, and is fixed to the movable arc electrode 21. The arc electrode 31 and the arc electrode 31 are aligned with each other to shift to the closed state.
At this time, the position of the piston head 42h of the fixed piston 42 does not change, and the movable portion 2 moves from the right to the left of the paper surface, so that the volume of the mechanical puffer chamber Mp is expanded. Therefore, the pressure inside the mechanical puffer chamber Mp is lower than the pressure outside the mechanical puffer chamber Mp, so that the check valve 43 is opened and a gas flow St of the insulating gas is generated.
The gas flow St flows from the outside of the support cylinder 41 through the filter 41f and the second intake port 41p, further through the first intake port 42p, and into the inside of the mechanical puffer chamber Mp. Further, by generating the gas flow St, it is possible to reduce the gas flow Sr flowing into the inside of the mechanical puffer chamber Mp between the movable arc electrode 21 and the insulating nozzle 25 and via the ejection port 23p.

The state of the gas-insulated opening / closing device 100 after the completion of the closing pole operation will be described with reference to FIG. 7.
Since the movable portion 2 is stopped, the pressure inside the machine puffer chamber Mp and the outside of the machine puffer chamber Mp are the same. Therefore, the check valve 43 is closed and the gas flow St is extinguished.
Even when the carbon Pc adhering to the portion of the inside 1n of the tank 1 is diffused to the inside 1n by the gas flow St, if the filtration performance of the filter 41f is set according to the particle size of the carbon Pc, the second The amount of carbon Pc that invades the mechanical puffer chamber Mp via the intake port 41p can be reduced.

The particle size of the carbon Pc is believed to be 1 μm to 500 μm. If the filtration performance of the filter 41f is set to remove solids having a particle size of 100 μm or more, carbon Pc having a particle size of 100 μm or more and other foreign substances can be suppressed from entering the inside of the mechanical puffer chamber Mp. Can be done.

Therefore, since the amount of carbon Pc staying in the mechanical puffer chamber Mp can be reduced, it is possible to reduce the carbon Pc diffused by the gas flow Sm and ejected from the ejection port 23p during the opening operation. That is, it is possible to prevent the carbon Pc from adhering to the insulating component such as the insulating nozzle 25.
The carbon Pc on the filter 41f in FIG. 7 is a schematic representation of the carbon Pc remaining in the filter 41f after being filtered by the filter 41f.

Further, as described above, during the closing operation of the gas-insulated opening / closing device 100, the gas flows into the inside of the mechanical puffer chamber Mp via the first intake port 42p, so that the gas flow Sr can be reduced. That is, it is possible to prevent the carbon Pc adhering to the fixing portion 3 from being diffused by the gas flow Sr and adhering to the insulating component such as the insulating nozzle 25.
Further, since the carbon Pc adhering to the fixing portion 3 can be suppressed from entering the inside of the mechanical puffer chamber Mp, the carbon Pc is diffused by the gas flow Sm during the opening operation, and the insulating property of the insulating nozzle 25 or the like is obtained. It is possible to suppress the adhesion to the parts of.

That is, according to the first embodiment, a highly reliable gas-insulated opening / closing device that suppresses carbon adhesion to insulating parts and maintains high electrical insulation even after repeated opening and closing operations is provided. can do.

Embodiment 2.
In the first embodiment, it has been described that the second intake port 41p is formed on the wall surface of the support cylinder 41, and the filter 41f is arranged so as to cover the second intake port 41p.
In the second embodiment, a mode in which the filter 41g is arranged in the space between the support cylinder 41 and the fixed piston 42 will be described.

FIG. 8 is a cross-sectional view of the gas-insulated opening / closing device 101 according to the second embodiment of the present invention during closed pole operation.
Since the same symbols and the same reference numerals as those in FIGS. 1 to 7 in the drawings are the same as or equivalent to those in the first embodiment, detailed description thereof will be omitted.
Further, since the opening and closing operations of the gas-insulated switching device 101 are the same as those of the gas-insulated switching device 100, detailed description thereof will be omitted.

With reference to FIG. 8, as described above, the filter 41g is arranged in the space between the support cylinder 41 and the fixed piston 42. In other words, the filter 41g is arranged between the first intake port 42p and the second intake port 41p. The space Ta is a space closed by the filter 41g and a part of the support cylinder 41. Further, since the installation angle of the filter 41g can be selected, it is possible to set the opening area of the filter 41g to be larger than the opening area of the second intake port 41p.
The filter 41g is an example of the second filter described in the claims.

During the closing operation, the gas flow St enters the space Ta from the second intake port 41p, passes through the filter 41g, and flows into the inside of the mechanical puffer chamber Mp. At this time, of the carbon Pc initially adhering to the portion of the inside 1n of the tank 1, the carbon Pc is diffused by the gas flow St and flows in from the second intake port 41p, and inside the space Ta, the wall surface of the support cylinder 41 and the support cylinder. There is something that sticks to the wall surface of 41.
The carbon Pc retained inside the space Ta is the second intake because the opening area of the second intake port 41p is smaller than the opening area of the filter 41g even when the carbon Pc stays inside the space Ta is diffused by the gas flow St during the re-closed operation. It is unlikely that it will flow out from the mouth 41p. The retained carbon Pc is filtered by the filter 41g or is adsorbed again on the wall surface of the support cylinder 41. That is, the gas-insulated opening / closing device 101 has an effect of filtering the carbon Pc by the filter 41g and an effect of accumulating the carbon Pc inside the space Ta.
As with the filter 41f of the first embodiment, if the filtration performance of the filter 41g is set according to the particle size of the carbon Pc, the carbon that penetrates into the mechanical puffer chamber Mp via the second intake port 41p. The amount of Pc can be reduced.

As described above, the particle size of carbon Pc is considered to be 1 μm to 500 μm. If the filtration performance of the filter 41 g is set to remove solids having a particle size of 100 μm or more, carbon Pc having a particle size of 100 μm or more and other foreign substances can be suppressed from entering the inside of the mechanical puffer chamber Mp. Can be done.

That is, in the second embodiment, it is possible to provide a gas-insulated opening / closing device that suppresses the adhesion of carbon to the insulating component even if the opening and closing operations are repeated and maintains high electrical insulation. ..
That is, the second embodiment has the effect of accumulating carbon Pc inside the space Ta in addition to the effect of the first embodiment. Therefore, it is possible to provide a highly reliable gas-insulated opening / closing device that suppresses the adhesion of carbon Pc to the insulating component even if the opening and closing operations are repeated and maintains high electrical insulation.

Embodiment 3.
In the first embodiment, it has been described that the second intake port 41p is formed on the wall surface of the support cylinder 41, and the filter 41f is arranged so as to cover the second intake port 41p. Further, in the second embodiment, the embodiment in which the filter 41g is arranged in the space between the support cylinder 41 and the fixed piston 42 has been described.
In the third embodiment, a mode in which the insulating nozzle 26 having the ablation property 26a is arranged instead of the insulating nozzle 25 of the gas-insulated opening / closing device 100 will be described.

FIG. 9 is a cross-sectional view of the gas-insulated opening / closing device 102 according to the third embodiment of the present invention in the vicinity of the insulating nozzle 26 during the opening operation.
Since the same symbols and the same reference numerals as those in FIGS. 1 to 7 in the drawings are the same as or equivalent to those in the first embodiment, detailed description thereof will be omitted.
Further, since the opening and closing operations of the gas-insulated switching device 102 are the same as those of the gas-insulated switching device 100, detailed description thereof will be omitted.
With reference to FIG. 9, as described above, the gas-insulated switching device 102 is the same as or equivalent to the gas-insulated switching device 100 except that the insulating nozzle 26 is arranged instead of the insulating nozzle 25, and the arc of the insulating nozzle 26 is used. The ablating material 26a is provided at the portion exposed to the discharge E.

Examples of the ablatorable material 26a include polytetrafluoroethylene (PTFE) and perfluoroalkyl vinyl ether copolymer (PFA).
Further, as the ablation material 26a, at least one compound selected from the group consisting of a perfluoroether-based polymer, a fluoroelastomer, and a 4-vinyloxy-1-butene (BVE) cyclized polymer can be used. can.

During the opening operation, the ablatorable material 26a generates a large amount of decomposition gas due to the high heat generated by the arc discharge E. At the same time, the volume of the mechanical puffer chamber Mp is compressed, so that a gas flow Sh to be blown to the arc discharge E is generated. Since the gas flow Sh is superposed on the gas flow Sm by the decomposition gas, the gas flow Sh becomes a larger amount of gas flow than the gas flow Sm.
By the gas flow Sh, the ions and electrons of the insulating gas constituting the arc discharge E are blown off, and the arc discharge E is extinguished. Further, since the gas flow Sh flows on the surface of the insulating nozzle 26, the carbon Pc is swept toward the fixed arc electrode 31 without adhering to the surface of the insulating nozzle 26 by the gas flow Sh. The carbon Pc in the figure is a schematic representation of the carbon Pc that is swept away, and is shown larger than the portion of the gas-insulated opening / closing device 102 in order to explain the effect of the present invention.

That is, in the third embodiment, in addition to the effect of the first embodiment, the carbon Pc has an effect of adhering to the surface of the insulating nozzle 26 during the opening operation and suppressing the adhesion. Therefore, it is possible to provide a highly reliable gas-insulated opening / closing device that suppresses the adhesion of carbon Pc to the insulating component even if the opening and closing operations are repeated and maintains high electrical insulation.

Embodiment 4.
In the third embodiment, the embodiment in which the insulating nozzle 26 having the ablation property 26a is arranged instead of the insulating nozzle 25 of the gas-insulated opening / closing device 100 has been described.
In the fourth embodiment, a mode in which an insulating nozzle 27 that generates oxygen (O) during the opening operation is arranged instead of the insulating nozzle 25 of the gas-insulated switching device 100 will be described.

FIG. 10 is a cross-sectional view of the gas-insulated opening / closing device 103 according to the third embodiment of the present invention in the vicinity of the insulating nozzle 27 during the opening operation.
Since the same symbols and the same reference numerals as those in FIGS. 1 to 7 in the drawings are the same as or equivalent to those in the first embodiment, detailed description thereof will be omitted.
Further, since the opening and closing operations of the gas-insulated switching device 103 are the same as those of the gas-insulated switching device 100, detailed description thereof will be omitted.
With reference to FIG. 10, as described above, the gas-insulated switching device 103 is the same as or equivalent to the gas-insulated switching device 100 except that the insulating nozzle 27 is arranged instead of the insulating nozzle 25.

The insulating nozzle 27 is an insulator composed of, for example, a fluororesin such as polytetrafluoroethylene as a main material, and is formed by mixing an oxygen-containing additive containing oxygen in its molecular structure. As the oxygen-containing additive, for example, at least one compound selected from boron oxide, calcium oxide, silicon oxide, beryllium oxide, tantalum oxide, and niobium oxide is used.

During the opening operation, the insulating nozzle 27 generates a large amount of decomposition gas due to the high heat generated by the arc discharge E, and releases oxygen (O). At the same time, by compressing the volume of the mechanical puffer chamber Mp, a CO ₂ gas stream is blown onto the arc discharge E to generate gaseous carbon (C) and oxygen (O) before the generation of fine particle carbon Pc. By binding to CO molecules or CO ₂ molecules, the generation of carbon Pc is suppressed.

That is, in the fourth embodiment, in addition to the effect of the first embodiment, by suppressing the generation of carbon Pc, the effect of suppressing the carbon Pc from adhering to the surface of the insulating nozzle 26 during the opening operation is obtained. Be prepared. Therefore, it is possible to provide a highly reliable gas-insulated opening / closing device that suppresses the adhesion of carbon Pc to the insulating component even if the opening and closing operations are repeated and maintains high electrical insulation.

In the first to fourth embodiments, CO ₂ is exemplified as the insulating gas, but the insulating gas is CO ₂ , C ₅ F ₁₀ O, C ₄ F ₇ N, HFO 1234ze, HFO 1234yf, HFE245ccb2, HCFO1233zd, O. The present invention is effective even if it is any one of ₂ or a mixed gas thereof.

Further, in the present invention, within the scope of the invention, each embodiment can be freely combined, and each embodiment can be appropriately changed or omitted.
For example, the insulating nozzle 26 having the ablatorable material 26a shown in the third embodiment may be arranged in the gas-insulated opening / closing device 101 shown in the second embodiment. Further, the gas-insulated opening / closing device 101 shown in the second embodiment may be provided with the insulating nozzle 27 that discharges the oxygen shown in the fourth embodiment. Further, the ablating material 26a may be provided in the insulating nozzle 27 that discharges oxygen shown in the fourth embodiment.

Further, in the first to fourth embodiments, the first intake port 42p is arranged on the piston head 42h of the fixed piston 42, and the check valve 43 for opening and closing the first intake port 42p is further arranged. However, at the intake port, the check valve is closed when the gas-insulated switching device (100 to 103) is opened, and the check valve is opened when the gas-insulated switching device (100 to 103) is closed. If so, the check valve arrangement position does not have to be the piston head 42h.
For example, an intake port that directly communicates with the inside of the machine puffer chamber Mp and the outside of the machine puffer chamber Mp may be arranged on the cylinder surface of the puffer cylinder 24, and a check valve may be further arranged. In this case, the second intake air is provided. It is not necessary to arrange the mouth 41p. The cylinder surface of the puffer cylinder 24 is a portion that partitions the inside of the machine puffer chamber Mp and the outside of the machine puffer chamber Mp.
The intake port in this case is an example of the first intake port described in the claims.
Further, although the check valve is exemplified in the first to fourth embodiments, the check valve is closed when the gas-insulated switching device (100 to 103) is opened, and the gas-insulated switching device (100 to 103) is closed. If it is a mechanism that opens during operation, it does not have to be a check valve. For example, a solenoid valve is arranged instead of the check valve, and this solenoid valve is closed when the gas-insulated switching device (100 to 103) is opened, and the gas-insulated switching device (100 to 103) is closed. It may be controlled by a higher-level control device so that it is sometimes opened.

In the first to fourth embodiments, the hole is arranged in the rod head 23h of the drive rod 23 and defined as the ejection port 23p, but the position between the movable arc electrode 21 through which the gas flow Sm passes and the insulating nozzle 25 is ejected. It may be defined as an exit. Further, the position where the gas flow Sm passes from the mechanical puffer chamber Mp to the arc discharge E may be defined as an ejection port. In other words, any position from between the movable arc electrode 21 and the fixed arc electrode 31 to the mechanical puffer chamber Mp may be defined as the ejection port.

Further, in the first embodiment and the third to fourth embodiments, the embodiment in which the second intake port 41p is formed on the wall surface of the support cylinder 41 and the filter 41f is arranged so as to cover the second intake port 41p has been described. Further, in the second embodiment, the embodiment in which the filter 41g is arranged in the space between the support cylinder 41 and the fixed piston 42 has been described. However, the position of the filter may be before the gas flow Sm flows into the mechanical puffer chamber Mp, and may not be the wall surface of the support cylinder 41 or the inside of the support cylinder 41 in this way.
For example, a filter may be arranged between the inner wall of the tank 1 and the support cylinder 41, and the gas flow Sm may be filtered before the gas flow Sm flows into the second intake port 41p. Further, in this case, one end side of the filter comes into contact with the inner wall of the tank 1 to be installed, and the other end side of the filter comes into contact with the support cylinder 41 to which the voltage is applied. It is necessary to electrically insulate the cylinder 41 from the cylinder 41.
The filter in this case is an example of the first filter described in the claims. Similar to the filter 41f and the filter 41g, if the filtration performance of the first filter is set according to the particle size of the carbon Pc, the amount of carbon Pc invading the machine puffer chamber Mp can be reduced. ..

As described above, the particle size of carbon Pc is considered to be 1 μm to 500 μm. If the filtration performance of the first filter is set to remove solids having a particle size of 100 μm or more, carbon Pc having a particle size of 100 μm or more and other foreign substances are suppressed from entering the inside of the mechanical puffer chamber Mp. can do.

Further, in the first and third to fourth embodiments, the embodiment in which the second intake port 41p is formed on the wall surface of the support cylinder 41 and the filter 41f is arranged so as to cover the second intake port 41p will be described. In the second embodiment, the embodiment in which the filter 41g is arranged in the space between the support cylinder 41 and the fixed piston 42 has been described. However, in the present invention, it may not be necessary to arrange the filter.
The distance between the second intake port 41p and the fixed portion 3 to which a relatively large amount of carbon Pc adheres is farther than the distance between the fixed portion 3 and the insulating nozzles (25, 26, 27). Therefore, the amount of carbon Pc flowing from the fixed portion 3 to the machine puffer chamber Mp via the second intake port 41p is smaller than that of the conventional gas-insulated opening / closing device, and adheres to the insulating nozzles (25, 26, 27). Carbon Pc can also be reduced.

That is, in the gas-insulated opening / closing device of the present invention, the arrangement position of the intake port, the type and arrangement position of the valve, the arrangement position of the filter and the presence / absence of the filter are appropriately determined in designing the gas-insulated opening / closing device.

1 tank, 21 movable arc electrode, 23p spout, 24 puffer cylinder, 25 insulating nozzle, 26a ablation material, 31 fixed arc electrode, 41 support cylinder, 41f, 41g filter, 42h piston head, 41p second intake port, 42 Fixed piston, 42p first intake port, 43 check valve, 100-103 gas-insulated switchgear, A-axis line, Mp mechanical puffer chamber.

Claims (8)

In the tank filled with insulating gas,
Conductive fixed electrodes and
A movable electrode that operates on the axis of the fixed electrode and can be contacted and separated from the fixed electrode,
A movable side housing that works with the movable electrode and surrounds the axis,
A support cylinder that supports the movable housing and
A piston forming a mechanical puffer chamber with the movable housing,
The ejection port for ejecting the insulating gas in the mechanical puffer chamber,
A first intake port for sucking the insulating gas into the mechanical puffer chamber ,
A second intake port passing through the inside and the outside of the support cylinder ,
A filter for filtering the insulating gas taken in from the second intake port is provided.
When the fixed electrode and the movable electrode change from a separated state to a state in which the fixed electrode and the movable electrode are connected , the insulating gas filtered by the filter is introduced from the first intake port. Inhale and
A gas characterized by ejecting the insulating gas taken in from the ejection port when the fixed electrode and the movable electrode change from the connected state to the state in which the fixed electrode and the movable electrode are separated from each other. Insulated opening and closing equipment. The filter is characterized in that, among foreign substances having a particle size of 1 μm to 500 μm contained in the insulating gas, foreign substances having a particle size larger than a preset size are removed and the insulating gas is filtered. The gas-insulated opening / closing device according to claim 1 . The gas-insulated opening / closing device according to claim 1 or 2 , wherein the first intake port is provided on the tubular surface of the movable side housing. It is equipped with an insulating nozzle made of an insulating material that works with the movable electrode and surrounds the movable electrode.
The gas-insulated opening / closing device according to any one of claims 1 to 3 , wherein the insulating nozzle has an ablatorable material. It is equipped with an insulating nozzle made of an insulating material that works with the movable electrode and surrounds the movable electrode.
The gas-insulated opening / closing device according to any one of claims 1 to 3 , wherein the insulating nozzle is mixed with an oxygen-containing additive containing oxygen in its molecular structure. The gas-insulated switchgear according to claim 4 , wherein the ablatorable material is a polytetrafluoroethylene or a perfluoroalkyl vinyl ether copolymer. The ablationable material is characterized by being at least one compound selected from the group consisting of a perfluoroether-based polymer, a fluoroelastomer, and a 4-vinyloxy-1-butene (BVE) cyclized polymer. The gas-insulated opening / closing device according to claim 4 . The gas-insulated switchgear according to claim 5 , wherein the oxygen-containing additive is a compound of at least one of boron oxide, calcium oxide, silicon oxide, beryllium oxide, tantalum oxide, and niobium oxide. ..

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