Gas-insulated apparatus

Abstract

Provided is a gas-insulated apparatus that uses an insulation gas that includes CO2 gas and makes it possible to safely perform inspection and maintenance work. According to the present invention, a gas-insulated apparatus causes a first contact and a second contact that are inside a first container to come into contact with each other to cause current to flow between the first contact and the second contact during energization, causes the first contact and the second contact to separate from each other and extinguishes an arc produced by the separation by means of an enclosed insulation gas during shutoff, and discharges the enclosed insulation gas through a gas in / outlet of the first container during exposure to the air, and a gas purification device is attached so as to be connected to the gas in / outlet to reduce the amount of carbon monoxide gas that is generated from carbon dioxide gas by the arc and included in the insulation gas discharged from the first container during exposure to the air and is removed so as to be disconnected from the gas in / outlet during energization and shutoff.

Description

Gas-insulated equipment

[0001] An embodiment of the present invention relates to gas-insulated equipment.

[0002] In power transmission, distribution, and transformation systems, sulfur hexafluoride (SF) is used as an insulating medium in sealed containers. ６ ) gas-filled equipment such as gas-insulated switchgear, gas circuit breakers, gas disconnecting switches, gas-insulated transformers, and gas-insulated power transmission pipes are used. ６ Gas is not only used as a high-voltage insulating medium, but also as a cooling medium that cools heat generated when electricity is passed through it by convection, and in devices that switch current, such as gas circuit breakers and gas disconnecting switches, it also functions as an arc-extinguishing medium that extinguishes arc discharges that occur during switching operations.

[0003] science fiction ６ Gas is an extremely stable, inert gas that is non-toxic and non-flammable, and at the same time, has excellent electrical insulation properties and the ability to extinguish electrical discharges (hereinafter referred to as arc-extinguishing properties), making a significant contribution to the high performance and compactness of power transmission, distribution, and transformation equipment.

[0004] However, it is known to have a high global warming effect, and in recent years there has been a desire to reduce its use. The magnitude of the global warming effect is generally measured by the global warming potential, or CO ２ It is expressed as a relative value when the gas is set to 1, and SF ６ The gas's global warming potential is known to be as high as 24,300 (AR6; the latest value from the IPCC Sixth Assessment Report).

[0005] In light of the above, SF is being used as an insulating gas in power transmission, distribution and transformation equipment. ６ Instead of carbon dioxide (CO ２ It has been proposed to apply CO ２ Gas has global warming effect ６ It is 24,300 times smaller than gas, so CO ２ Gas SF ６ By applying it instead of gas to power transmission, distribution, and transformation equipment, it is possible to significantly reduce the impact on global warming.

[0006] Also, CO ２The insulating and arc-extinguishing properties of the gas are ６ Although it is inferior to gas, SF ６ It is known that CO2 has far superior arc-extinguishing performance compared to air, which was the main insulating and arc-extinguishing medium before its application to gas-insulated equipment, and that its insulating performance is equal to or even superior to that of CO2. ２ Gas SF ６ By using it instead of gas, it is possible to provide environmentally friendly power transmission, distribution, and transformation equipment that has generally good performance and reduces the impact on global warming.

[0007] In devices that have the function of switching current, such as gas circuit breakers and gas disconnecting switches, arc discharge inevitably occurs within the sealed container during operation. When an arc discharge occurs within the sealed container, the gas filled within the container becomes plasma during the discharge process, causing molecular dissociation and recombination.

[0008] SF, which is conventionally used in substation equipment ６ The gas has a very stable molecular structure, so even if the molecules are dissociated by discharge, most of them remain in the original SF under normal conditions. ６ It is known that CO dissociated by arc discharge recombines into molecules. ２ is the original CO ２ However, it is difficult for the gas to completely recombine with oxygen, and some of it dissociates into carbon monoxide (CO) gas and oxygen gas. The oxygen gas is consumed through an oxidation reaction with metals such as copper and iron inside the sealed container, but the toxic CO gas may remain.

[0009] If CO gas remains, the CO ２ During internal inspection of gas-insulated equipment, there is a possibility that CO gas may be inhaled when the insulating gas is released to the atmosphere. Currently, it is necessary to limit the location and direction of CO gas emission, or to recover the CO gas, which reduces the work efficiency of gas exchange and maintenance inspection. ６ There is a problem that there is no improvement compared to gas circuit breakers.

[0010] science fiction ６In gas-filled equipment, synthetic zeolite is used as an adsorbent to absorb SF suspended in the filled gas due to differences in molecular diameter. ６ It was possible to adsorb and separate the decomposition gases. ２ Since CO gas and CO gas have similar molecular diameters, it is difficult to select an adsorbent that can selectively adsorb and separate CO gas.

[0011] JP 2015-73348 A

[0012] Uchii, Kono, Nakamoto, and Mizoguchi, "Basic Characteristics of CO2 Gas as an Arc-Extinguishing Medium and Verification of Thermal Interruption Performance Using a Full-Scale Model Circuit Breaker," IEEJ Transactions B, Vol. 124, No. 3, pp. 469-475, 2004.

[0013] The problem that the present invention aims to solve is ２ The present invention provides gas-insulated equipment that uses an insulating gas containing a gas, and that allows inspection and maintenance work to be carried out safely.

[0014] A gas-insulated apparatus according to an embodiment includes a first container filled with an insulating gas containing carbon dioxide, a first contact provided within the first container, a second contact provided within the first container, and a gas purifier connectable to a gas inlet / outlet of the first container. When energized, the gas-insulated apparatus brings the first contact into contact with the second contact to allow a current to flow between the first contact and the second contact, when interrupted, separates the first contact from the second contact, and an arc generated by the separation is extinguished by the enclosed insulating gas. When opened to the atmosphere, the enclosed insulating gas is discharged through the gas inlet / outlet. When opened to the atmosphere, the gas purifier is attached to be connected to the gas inlet / outlet and reduces the amount of carbon monoxide gas contained in the insulating gas discharged from the first container and generated from the carbon dioxide gas due to the arc. When energized and when interrupted, the gas purifier is detached to disconnect from the gas inlet / outlet.

[0015] FIG. 1 is a schematic diagram showing a configuration example of a first embodiment of a gas circuit breaker. FIG. 2 is a schematic diagram showing a configuration example of a gas purifying device in a second embodiment of the gas circuit breaker. FIG. 3 is a schematic diagram showing a configuration example of a gas purifying device in a third embodiment of a gas insulated device. FIG. 4 is a schematic diagram showing a configuration example of a gas purifying device in a fourth embodiment of a gas insulated device. FIG. 5 is a schematic diagram showing a configuration example of a fifth embodiment of a gas insulated device. FIG. 6 is a schematic diagram showing a configuration example of a sixth embodiment of a gas insulated device. FIG. 7 is a schematic diagram showing a configuration example of a seventh embodiment of a gas insulated device. FIG. 8 is a schematic diagram showing a configuration example of an eighth embodiment of a gas insulated device. FIG. 9 is a schematic diagram showing a configuration example of a ninth embodiment of a gas insulated device. FIG. 10 is a schematic diagram showing a configuration example of a tenth embodiment of a gas insulated device. FIG. 11 is a schematic diagram showing a configuration example of an eleventh embodiment of a gas insulated device. FIG. 12 is a schematic diagram showing a configuration example of a twelfth embodiment of a gas insulated device.

[0016] (First embodiment) Fig. 1 is a schematic diagram showing a configuration example of a first embodiment of gas insulated equipment. Fig. 1 shows gas insulated equipment 1. An example of the gas insulated equipment 1 includes a puffer-type gas circuit breaker that is used mainly to interrupt fault currents in systems such as high-voltage systems. The gas insulated equipment 1 has a container 2 made of a grounded metal, insulators, etc. An insulating gas 3 is sealed inside the container 2. The insulating gas 3 is carbon dioxide (CO ) that acts as an electrical insulating medium and an arc extinguishing medium. ２ ) gas. An example of the insulating gas 3 is CO ２ gas or CO ２ This includes mixed gases mainly composed of CO ２ The mixed gas mainly contains CO ２ The ratio of gas is the highest. ２ Examples of other gases that can form a gas mixture with the gas include nitrogen (N ２ The insulating gas 3 sealed in the container 2 preferably does not contain gases such as water vapor.

[0017] A fixed part 4, which is composed of a fixed current-carrying part 4a, a fixed arc contact 4b, etc., is insulated and fixed within the vessel 2 via a support insulator 8. A movable part 5 is movably installed within the vessel 2, insulated and supported from the vessel 2, and opposed to the fixed part 4. The movable part 5 can be configured by attaching an insulating nozzle 5a, a movable arc contact 5b, a current-carrying contact 5c, and a puffer cylinder 5d to a drive rod 5e. The mobility of the movable part 5 is achieved by connecting the drive rod 5e to a movable part within a drive device 9 via the support insulator 8.

[0018] The driving device 9 can drive the movable part 5 to control the switching operation of the gas insulated equipment 1. The driving device 9 may be configured, for example, by a control device having hardware with an arithmetic unit such as a processor. Note that each operation may be stored as an operation program in a computer-readable recording medium such as a memory, and the switching operation of the gas insulated equipment 1 may be executed by appropriately reading the operation program stored in the recording medium using hardware.

[0019] The gas-insulated equipment 1 has a valve 13 connected via a pipe 12 to an inlet / outlet (gas inlet / outlet) GT near the right end of the bottom of the container 2 and installed to fill with insulating gas 3 or release to the atmosphere. The inlet / outlet GT may be an opening connecting the inside and outside of the container 2. The end of the pipe 12 may be connected to, for example, the atmospheric atmosphere. The gas-insulated equipment 1 has a gas purifying device GP having a container 14 and a catalyst 15 arranged in the container 14. The catalyst 15 purifies CO gas by converting it into CO ２ In this embodiment, the inlet / outlet GT and the gas purifying device GP are disposed near the right end of the bottom of the container 2 as shown in FIG.

[0020] The gas purifier GP can purify the gas discharged from the inlet / outlet GT when the gas is open to the atmosphere (for example, during maintenance and inspection). The gas purifier GP is provided, for example, so as to be connectable to the container 2, and is attached, for example, to the atmosphere side of the valve 13 as a carbon monoxide reduction mechanism. The gas purifier GP has, for example, a connecting end connectable to the pipe 12, and can be used by fitting the connecting end of the gas purifier GP to the connecting end of the pipe 12.

[0021] The connecting end of the gas purifier GP may be an opening that corresponds to the inlet of the gas purifier GP and allows the connecting end of the piping 12 to be inserted and detached. Alternatively, the connecting end of the piping 12 may be one of a convex portion or a concave portion, and the connecting end of the gas purifier GP may be the other of the convex portion or the concave portion, and the inlet / outlet GT and the gas purifier GP may be connected by fitting the convex portion and the concave portion together. Alternatively, the piping 12 may be formed of a plurality of pipes, one of the plurality of pipes connected to the inlet / outlet GT, another of the plurality of pipes connected to the inlet of the gas purifier GP, and another of the plurality of pipes connected to the outlet of the gas purifier GP, and the inlet / outlet GT and the gas purifier GP may be connected by fitting one of the plurality of pipes with the other of the plurality of pipes.

[0022] Next, we will explain an example of the operation of the gas-insulated equipment 1. The gas-insulated equipment 1 has an energizing period during which the gas-insulated equipment 1 performs an energizing operation, a shutoff period during which the gas-insulated equipment 1 performs a shutoff operation, and an inspection period (open-to-atmosphere period) during which the gas-insulated equipment 1 is opened to the atmosphere.

[0023] When energized (when power is turned on), after insulating gas 3 is filled and power is turned on, the gas insulated equipment 1 moves the fixed part 4 and the movable part 5 relatively to each other, bringing the fixed arcing contact 4 b and the movable arcing contact 5 b into contact with each other, thereby allowing a current to flow between the fixed arcing contact 4 b and the movable arcing contact 5 b. The current may be drawn out of the gas insulated equipment 1 through a current-carrying conductor or bushing that is in contact with the fixed part 4 or the movable part 5.

[0024] Next, at the time of breaking, the gas-insulated equipment 1 moves the fixed part 4 and the movable part 5 relative to each other, causing the fixed arc contact 4b and the movable arc contact 5b to separate (detach), thereby generating an arc discharge 7 between the fixed arc contact 4b and the movable arc contact 5b.

[0025] At the time of breaking, the internal space between the piston 6 and the puffer cylinder 5d is compressed, and the pressurized insulating gas 3 in this section forms a gas flow, which is rectified by the insulating nozzle 5a and sprayed onto the arc caused by the arc discharge 7. As a result, the conductive arc is extinguished (extinguished) and the current is broken. The insulating gas 3 sprayed onto the arc discharge 7 forms a gas flow 10, which passes through the interior of the fixed part 4 and the exhaust tower 11, and is dispersed into the vessel 2.

[0026] Next, the insulating gas 3 (enclosed insulating gas 3) dispersed in the container 2 during inspection (when the gas-insulated equipment 1 is not operating) is discharged from the gate GT. During the inspection period, the power supply to the gas-insulated equipment 1 is shut off, and then the gas is released to the atmosphere, and maintenance including inspection of the gas-insulated equipment 1 is carried out. After the maintenance is completed, insulating gas is sealed into the container 2, and power is turned on to the gas-insulated equipment 1, thereby restoring the function of the gas-insulated equipment 1 as a circuit breaker.

[0027] CO ２ When arc discharge 7 occurs in the gas, CO, which should be present as an insulating gas, ２ The amount of gas decreases, and instead, CO ２ The amount of CO gas, which is a decomposition gas generated from the gas, increases, but CO ２ The change in insulation performance due to the conversion (conversion) of CO gas to CO gas is slight, and the CO gas is oxidized in the container 2 to CO ２ There is little need to convert it into gas. However, CO gas may be dangerous to humans when exposed to the atmosphere during internal inspections, etc.

[0028] Therefore, in this embodiment, a gas purification device GP in which a catalyst 15 is disposed is installed when the gas is open to the atmosphere, and the insulating gas 3 containing CO gas is introduced into the gas purification device GP through the pipe 12 and the valve 13, whereby the CO gas is oxidized by the catalyst 15 to produce CO２ As a result, the CO gas contained in the insulating gas 3 is removed, and the risk of danger to the human body when the insulating gas 3 is exposed to the atmosphere can be avoided.

[0029] The catalyst 15 can promote a reaction that converts CO gas into a carbon compound gas different from CO gas. For example, the catalyst 15 oxidizes CO gas to CO ２ The catalyst 15 can promote the reaction of converting the CO gas into CO 2 gas. Examples of the catalyst 15 include a substance (oxidation catalyst) containing at least one metal element selected from platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), manganese (Mn), titanium (Ti), and cesium (Ce). The shape and form of the substance are not particularly limited. The gas purifying device GP converts the CO gas and water vapor in the insulating gas 3 into CO 2 gas. ２ Gas and hydrogen gas may be produced.

[0030] Because the gas purifier GP is removable, it can be disconnected from the inlet / outlet GT of the container 2 during operation of the gas-insulated equipment 1, such as when the gas is energized or cut off, or after maintenance and inspection, and can be attached so that it is connected to the inlet / outlet GT only when the gas is open to the atmosphere. The removed gas purifier GP can be used, for example, for another gas-insulated equipment having a similar structure to the gas-insulated equipment 1. In this way, using a removable gas purifier GP can improve the convenience of the gas purifier GP. Furthermore, by attaching the gas purifier GP outside the container 2, deterioration of the gas purifier GP can be suppressed compared to another gas-insulated equipment in which the gas purifier GP is attached inside the container 2.

[0031] The gas purification device GP uses a gas flow 10 resulting from the pressure difference between the atmospheric pressure and the gas pressure of the insulating gas 3 inside the container 2 when the insulating gas 3 is released to the atmosphere, and therefore can introduce a large amount of CO gas into the gas purification device GP in a short time without using a power source and convert the CO gas into a carbon compound gas. This reduces the amount of CO gas, allowing the discharged insulating gas 3 to be purified.

[0032] As described above, in this embodiment, CO is used as an insulating medium. ２In gas-insulated equipment, CO caused by arcs ２ It is possible to provide an environmentally friendly gas-insulated device that can be inspected and maintained safely by removing CO gas generated by gas dissociation.

[0033] CO ２ Oxygen (O ２ ) Gas may be generated. ２ The gas oxidizes, for example, metals, particularly copper and iron, in the container 2 to form oxides such as CuO and FeO. It also has the effect of oxidizing the wall surface of the pipe 12 to form FeO and the like.

[0034] In this embodiment, when the CO gas introduced from the gas insulated equipment 1 comes into contact with the catalyst 15, the CO gas is oxidized to CO ２ In this process, the catalyst 15 remains unchanged, so it can be used semi-permanently. ２ The catalyst 15 is attached only when the gas-insulated equipment 1 is open to the atmosphere, so that one gas purifier GP can be shared by multiple pieces of gas-insulated equipment 1. Because the catalyst 15 is expensive, the cost of the gas-insulated equipment 1 can be reduced by sharing the gas purifier GP.

[0035] 2 is a schematic diagram showing a configuration example of a gas purifying apparatus according to a second embodiment of the gas insulated apparatus. This embodiment differs from the gas insulated apparatus 1 of the first embodiment in that a catalyst 15 is supported by a carrier 16 in a container 14 of the gas purifying apparatus GP.

[0036] The components and shape of the support 16 are not particularly limited. The support 16 is made of, for example, aluminum oxide (Al ２ O ３ ) and titanium oxide (TiO ２ The catalyst 15 can be formed from a metal oxide such as a palladium or a palladium-containing metal. Examples of methods for supporting the catalyst 15 on the support 16 include, but are not limited to, impregnation, liquid phase methods such as deposition-precipitation and deposition-reduction, methods using an organometallic complex as a starting material, and methods using a metal target by sputtering.

[0037] Examples of the shape of the support 16 include a spherical shape, a cylindrical shape, and a cylindrical shape. The catalyst 15 may be disposed or packed in the container 14 without being supported by the support 16. For example, as shown in Fig. 2, by supporting the catalyst 15 on the surface of the support 16 to form a spherical structure, the contact efficiency between the catalyst 15 and CO gas can be improved. Therefore, the conversion efficiency of CO gas can be improved.

[0038] The rest of the description of the second embodiment can be appropriately cited from the description of the first embodiment.

[0039] 3 and 4 are schematic diagrams showing a configuration example of a gas purifier according to a third embodiment of gas insulated equipment. This embodiment differs from the first embodiment in that a catalyst 15 is supported on a carrier 16 having a honeycomb structure in a container 14 of the gas purifier GP.

[0040] The shape of the openings of the honeycomb structure of the carrier 16 may be hexagonal, polygonal, or circular. When using such a honeycomb structure carrier 16, the catalyst 15 is disposed by adhering to the inner wall surface of the openings S of the honeycomb structure, as shown in Figure 4.

[0041] In this embodiment, the CO gas easily diffuses within the openings S of the honeycomb structure of the carrier 16, thereby improving the contact efficiency between the catalyst 15 and the CO gas. Therefore, the conversion efficiency of the CO gas by the catalyst 15 is improved.

[0042] The catalyst 15 can be attached to the openings S of the honeycomb-structured carrier 16, as in the second embodiment, by using, for example, an impregnation method, a liquid phase method such as a deposition-precipitation method or a deposition-reduction method, a method using an organometallic complex as a starting material, or a method of sputtering a metal target.

[0043] The other explanations of the third embodiment can be appropriately cited from the explanations of the first embodiment.

[0044] 5 is a schematic diagram showing a configuration example of a gas purifier according to a fourth embodiment of the gas insulated equipment. This embodiment differs from the first embodiment in that, in the container 14 of the gas purifier GP, the catalyst 15 is not supported on a carrier 16, but is granulated and molded into pellets and filled into the container 14.

[0045] In this embodiment, unlike the third embodiment, there is no need to perform a process of supporting the catalyst 15 on the carrier 16, and the gas purification device GP can be made to function by filling the container 14 with the pellet-shaped catalyst 15, thereby reducing the manufacturing cost of the gas purification device GP and making it easier to replace the gas purification device GP.

[0046] The other explanations of the fourth embodiment can be appropriately cited from the explanations of the first embodiment.

[0047] 6 is a schematic diagram showing a configuration example of a fifth embodiment of gas insulated equipment. This embodiment differs from the first embodiment in that a cover 17 is provided in the container 2 of the gas insulated equipment 1 near the exhaust tower 11 and an adsorbent 18 is provided inside the cover 17.

[0048] The cover 17 preferably has a structure that allows the insulating gas 3 to pass through and supports the adsorbent 18. The cover 17 may be provided in contact with the inner wall of the container 2.

[0049] The adsorbent 18 is provided, for example, in contact with the inner surface of the cover 17. Examples of the adsorbent 18 include synthetic zeolite. Note that the locations where the cover 17 and the adsorbent 18 are arranged are not particularly limited.

[0050] As explained in the first embodiment, CO ２ When arc discharge 7 occurs in the gas, CO, which should be present as an insulating gas, ２ The amount of CO gas decreases, and instead the amount of CO gas, which is a decomposition gas, increases. ２ The gas is introduced into the gas purification device GP, and the CO gas in the gas is purified by CO ２However, in addition to CO gas, hydrogen fluoride (HF) gas is generated from the decomposition gas, which is composed of F element contained in the insulating nozzle 5a and H element contained in traces of moisture contained in the sealed container. When HF gas is introduced into the gas purifying device GP when the container is opened to the atmosphere, the catalyst 15 deteriorates, and the CO gas is oxidized to CO ２ In other words, the components of the insulating gas such as HF gas oxidize the CO gas by the catalyst 15 and convert it into CO ２ It inhibits the reaction that converts it into gas.

[0051] In this embodiment, by placing an adsorbent 18 inside the container 2, the HF gas contained in the decomposition gas can be adsorbed while the gas-insulated equipment 1 is operating (when the gas-insulated equipment 1 is in operation), for example, when power is supplied or cut off, thereby suppressing the HF gas introduced into the gas purification device GP when the gas is opened to the atmosphere, and suppressing deterioration of the catalyst 15.

[0052] The other explanations of the fifth embodiment can be appropriately cited from the explanations of the first embodiment.

[0053] 7 is a schematic diagram showing a sixth embodiment of gas-insulated equipment. This embodiment differs from the first or fifth embodiment in that a pipe 20 is provided upstream of the gas purifying apparatus GP, through which a gas containing oxygen gas and moisture (water vapor) flows and which is supplied to the gas purifying apparatus GP. The pipe 20 is connected to the pipe 12 downstream of the valve 13 and upstream of the gas purifying apparatus GP.

[0054] When an oxidation catalyst containing a metal element such as Pt is used as the catalyst 15, the oxidation efficiency (CO conversion efficiency) of the oxidation catalyst can be improved by supplying a gas containing oxygen gas and water vapor. Therefore, in this embodiment, the function of the gas purification device GP can be improved by introducing a gas such as compressed air containing oxygen gas and water vapor into the gas purification device GP from the pipe 20 via the pipe 12.

[0055] The other explanations of the sixth embodiment can be appropriately cited from the explanations of the first or fifth embodiment.

[0056] 8 is a schematic diagram showing a seventh embodiment of the gas insulated apparatus 1. This embodiment differs from the first or fifth embodiment in that it includes a heater 19 disposed in the container 14 that houses the catalyst 15.

[0057] The heater 19 can adjust the temperature of the container 14 and the catalyst 15. The heater 19 may be provided, for example, in contact with the outside of the container 14. The heater 19 may have a temperature sensor that measures the temperature of the container 14.

[0058] The CO gas is oxidized by the catalyst 15 to produce CO ２ The efficiency of the function of promoting the reaction to convert the catalyst into gas varies depending on the temperature of the catalyst 15. Furthermore, the temperature range (also called the active temperature range) in which the catalyst 15 has the maximum conversion efficiency also differs depending on the type of catalyst 15. Therefore, in this embodiment, the gas purification device GP is provided with a heater 19, which, for example, heats the catalyst 15 and adjusts the temperature of the catalyst 15 to the active temperature range, thereby improving the function of the gas purification device GP.

[0059] The other explanations of the seventh embodiment can be appropriately cited from the explanations of the first or fifth embodiment.

[0060] 9 is a schematic diagram showing an eighth embodiment of gas insulated equipment. This embodiment differs from the first or fifth embodiment in that a gas purifier GPa is further provided in the downstream (outlet side) of the gas purifier GP. The gas purifier GPa is connected in series to the gas purifier GP.

[0061] The gas purifier GPa has a container 14a through which the insulating gas 3 flows and a catalyst 15a disposed in the container 14a. The gas purifier GPa may have a structure that allows it to be connected to the inlet / outlet GT, similar to the gas purifier GP.

[0062] The inlet of the container 14a is connected to the outlet of the container 14. The description of the container 14 can be used for other descriptions of the container 14a as appropriate.

[0063] Catalyst 15a contains at least one metal element from the group of catalysts applicable to catalyst 15, namely Pt, Pd, Ru, Rh, Fe, Co, Ni, Cu, Zn, Mn, Ti, and Ce. Catalyst 15 preferably has a different composition from catalyst 15a.

[0064] The CO gas is oxidized by the catalyst 15 to produce CO ２ The efficiency of the function of promoting the reaction of converting the insulating gas 3 into gas varies depending on the temperature. Therefore, in this embodiment, the gas purifier GP and the gas purifier GPa are filled with catalysts 15 and 15a, which have different temperature ranges (active temperature ranges) at which the conversion efficiency is maximized. This allows the gas purifier GP and the gas purifier GPa to function in different active temperature ranges, thereby enabling the insulating gas 3 to be purified over a wide temperature range without, for example, providing a heater or power source. The description of the gas purifier GP can be used as appropriate for other descriptions of the gas purifier GPa.

[0065] The other explanations of the eighth embodiment can be made by appropriately referencing the explanations of the first or fifth embodiment.

[0066] 10 is a schematic diagram showing a ninth embodiment of gas insulated equipment. This embodiment differs from the eighth embodiment in that a gas purifier GPb is provided in series with the outlet side (rear side) of the gas purifier GP, instead of the gas purifier GPa.

[0067] The gas purification device GPb has a container 14b through which the insulating gas 3 flows and a catalyst 15b disposed in the container 14b. The gas purification device GPb may have a structure that allows it to be connected to the inlet / outlet GT, similar to the gas purification device GP.

[0068] The inlet of the container 14b is connected to the outlet of the container 14. The description of the container 14 can be used for other descriptions of the container 14b as appropriate.

[0069] Nitrogen (N ２ ) If a small amount of gas is mixed in, CO ２ Gas and N ２ The catalyst 15b converts NOx gas into N ２ Gas and oxygen (O２ ) gas. The catalyst 15b can be formed from a substance containing a metal element such as vanadium (V) or tungsten (W) instead of the catalyst group applicable to the catalyst 15. The reaction promoted by the catalyst 15b does not have to be the decomposition reaction of NOx, and the catalyst 15b may promote a reaction that decomposes a specific harmful gas. The catalyst 15b may be supported on the carrier 16 in the same manner as the catalyst 15. The other explanations of the catalyst 15b can be appropriately cited from the explanation of the catalyst 15.

[0070] In this embodiment, by filling the gas purifier GPb with a catalyst 15b that promotes reactions other than the oxidation reaction of CO gas, it becomes possible for the gas purifier GP to purify the CO gas contained in the insulating gas 3, and for the gas purifier GPb to purify harmful gases other than CO gas contained in the insulating gas 3. Note that this embodiment is not limited to a configuration in which the gas purifier GPb is connected in series downstream of the gas purifier GP, and the gas purifier GPb may be connected in series upstream of the gas purifier GP. The description of the gas purifier GP can be used as appropriate for other descriptions of the gas purifier GPb.

[0071] The rest of the description of the ninth embodiment can be appropriately cited from the description of the first or fifth embodiment.

[0072] 11 is a schematic diagram showing a gas insulated apparatus according to a tenth embodiment of the present invention. This embodiment differs from the first or fifth embodiment in that it includes a pipe 21 connected to the pipe 12 upstream of the gas purifying apparatus GP and downstream of the valve 13, and a gas purifying apparatus GPc connected to an end of the pipe 21.

[0073] The pipe 21 connects the pipe 12 and the gas purifying device GPc. The pipe 21 carries the insulating gas 3 supplied from the inlet / outlet GT to the gas purifying device GPc.

[0074] Like the gas purifier GP, the gas purifier GPc can purify the discharged insulating gas 3. The gas purifier GPc is connected in parallel to the gas purifier GP. In this embodiment, a plurality of gas purifiers GPc may be connected in parallel to the gas purifier GP.

[0075] The gas purification device GPc has a container 14c through which the insulating gas 3 flows, and a catalyst 15c disposed in the container 14c.

[0076] The inlet of the vessel 14c is connected to the pipe 12. The description of the vessel 14 can be used for other descriptions of the vessel 14c as appropriate.

[0077] The catalyst 15c is the same type of catalyst as the catalyst 15. The description of the catalyst 15 can be used for other explanations of the catalyst 15c as appropriate. The catalyst 15c may be supported on the support 16, similar to the catalyst 15.

[0078] In this embodiment, the insulating gas 3 introduced through the valve 13 is introduced into the gas purifier GP and the gas purifier GPc, respectively, and the CO gas in the insulating gas 3 is converted and released into the atmosphere. At this time, the flow path area for the CO gas is increased compared to when the gas purifier GPc is not provided, so that the release of the insulating gas 3 to the atmosphere can be completed more quickly than in the first embodiment, for example. The description of the gas purifier GP can be used as appropriate for other explanations of the gas purifier GPc.

[0079] The rest of the description of the tenth embodiment can be appropriately cited from the description of the first or fifth embodiment.

[0080] 12 is a schematic diagram showing a gas insulated apparatus according to an eleventh embodiment of the present invention. This embodiment differs from the first or fifth embodiment in that a pipe 22 is connected to the upstream or downstream of the gas purifying apparatus GP.

[0081] The pipe 22 is connected to an end of the piping 12, for example, at a stage subsequent to the gas purifying apparatus GP. The pipe 22 extends from the gas purifying apparatus GP to the outside of the gas-insulated equipment 1. An example of the pipe 22 includes a rubber hose.

[0082] CO contained in the discharged insulating gas 3 ２ The gas is harmless, but when exposed to the atmosphere, CO ２ The concentration increases, and CO ２ Therefore, in this embodiment, by extending the part open to the atmosphere using the pipe 22, it is possible to open to the atmosphere at any position in the substation, and the CO ２The increase in concentration can be suppressed.

[0083] The rest of the description of the eleventh embodiment can be appropriately cited from the description of the first or fifth embodiment.

[0084] 13 is a schematic diagram showing a gas insulated apparatus according to a twelfth embodiment of the present invention. This embodiment differs from the first or fifth embodiment in that it further includes a gas recovery device 23 arranged downstream of the gas purification device GP.

[0085] An inlet of the gas recovery device 23 is connected to an outlet of the gas purification device GP via a pipe 12. The gas recovery device 23 has a container that stores the insulating gas 3, for example.

[0086] Insulating gas 3 is CO ２ gas or CO ２ In the case of a mixed gas containing a gas, the insulating gas 3 that is released to the atmosphere by attaching the gas purifier GP when the container is opened to the atmosphere is the same as the insulating gas 3 that is sealed (supplied) into the container 2 before the energizing or shutoff operation. Therefore, in this embodiment, a gas recovery device 23 is provided downstream of the gas purifier GP, and the insulating gas 3 that has been treated by the gas purifier GP when the container is opened to the atmosphere (purified insulating gas 3) is recovered and supplied again to the container 2 before the energizing or shutoff operation, thereby allowing the insulating gas 3 to be reused.

[0087] The rest of the description of the twelfth embodiment can be appropriately cited from the description of the first or fifth embodiment.

[0088] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. ２ In addition to oxidation to gas, other methods such as hydrogenation reactions for synthesizing methane or methanol from CO gas exist, and these may also be applied.

[0089] In the above-described embodiments, a puffer-type gas circuit breaker has been described as an example of the gas-insulated equipment 1. However, even in electric power equipment that does not switch current, CO gas may be generated due to an internal accident (discharge in a sealed container), etc., so CO may be used as an insulating gas.２ The gas purifying apparatus GP similar to the gas purifying apparatus GP of each embodiment can be applied to gas-insulated equipment such as gas-insulated switchgear, gas disconnecting switch, gas-insulated transformer, gas-insulated power pipe (gas-insulated power line (GIL)), etc. Furthermore, the above-described embodiments can be combined as appropriate.

[0090] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

[0091] 1...gas-insulated equipment, 2...vessel, 3...insulating gas, 4...fixed part, 4a...fixed current-carrying part, 4b...fixed arc contact, 5...movable part, 5a...insulating nozzle, 5b...movable arc contact, 5c...current-carrying contact, 5d...puffer cylinder, 5e...drive rod, 6...piston, 7...arc discharge, 8...support insulator, 9...drive device, 10...gas flow, 11...exhaust tower, 12...piping, 13...valve, 14...vessel, 14a...vessel, 14b...vessel, 14c...vessel, 15...catalyst, 15a...catalyst, 15b...catalyst, 15c...catalyst, 16...carrier, 17...cover, 18...adsorbent, 19...heater, 20...piping, 21...piping, 22...tube, 23...gas recovery device, GP...gas purification device, GPa...gas purification device, GPb...gas purification device, GPc...gas purification device, GT...inlet / outlet

Claims

1. A gas-insulated equipment comprising: a first container filled with insulating gas containing carbon dioxide gas; a first contactor provided in the first container; a second contactor provided in the first container; and a gas purifying device connectable to a gas inlet / outlet of the first container, wherein the gas-insulated equipment: when energized, brings the first contactor and the second contactor into contact with each other to allow current to flow between the first contactor and the second contactor; when interrupted, separates the first contactor and the second contactor, and an arc generated by the separation is extinguished by the enclosed insulating gas; when opened to the atmosphere, discharges the enclosed insulating gas from the gas inlet / outlet; and the gas purifying device is attached to be connected to the gas inlet / outlet and reduces the amount of carbon monoxide gas contained in the insulating gas discharged from the first container and generated from the carbon dioxide gas due to the arc when opened to the atmosphere, The gas insulated equipment is removed so as to be disconnected from the gas inlet / outlet port during the energization and the shutdown.

2. The gas insulated equipment according to claim 1, wherein the gas purifying device comprises: a second container through which the discharged insulating gas flows; and a catalyst disposed in the second container, which promotes a reaction that converts the carbon monoxide gas into the carbon dioxide gas.

3. The gas insulated equipment according to claim 2, wherein the catalyst contains at least one metal element selected from the group consisting of platinum, palladium, ruthenium, rhodium, iron, cobalt, nickel, copper, zinc, manganese, titanium, and cesium.

4. The gas insulated equipment according to claim 2, wherein the gas purifying device further comprises a carrier that supports the catalyst, and the carrier has a honeycomb structure.

5. The gas insulated equipment according to claim 2, wherein the catalyst has a pellet shape.

6. The gas insulated equipment according to claim 2, further comprising an adsorbent disposed within the first container for adsorbing components contained in the enclosed insulating gas and inhibiting a reaction of converting the carbon monoxide gas into the carbon dioxide gas, the reaction being promoted by the catalyst.

7. The gas insulated equipment according to claim 1, further comprising: a first pipe connected to the gas inlet / outlet, connectable to the gas purifying device, and through which the discharged insulating gas flows; and a second pipe connected to the first pipe, which is supplied to the gas purifying device and through which a gas containing oxygen gas and water vapor flows.

8. The gas insulated equipment according to claim 2, further comprising a heater for adjusting the temperature of the catalyst.

9. The gas insulated equipment according to claim 1, comprising a plurality of the gas purifying devices, the plurality of gas purifying devices being connected in series with each other, each of the plurality of gas purifying devices having a second container through which the discharged insulating gas flows and a catalyst disposed in the second container, the catalyst of each of the plurality of gas purifying devices promoting a reaction that converts the carbon monoxide gas into the carbon dioxide gas, and the catalysts of the plurality of gas purifying devices having compositions different from one another.

10. The gas insulated equipment according to claim 8, wherein the catalysts of the plurality of gas purifying devices have different active temperature ranges.

11. The gas insulated equipment according to claim 1, comprising a plurality of the gas purifying devices, the plurality of gas purifying devices being connected in series with each other, each of the plurality of gas purifying devices having a second container through which the discharged insulating gas flows and a catalyst disposed in the second container, the catalyst of one of the plurality of gas purifying devices promoting a reaction that converts the carbon monoxide gas into the carbon dioxide gas, and the catalyst of another of the plurality of gas purifying devices promoting a reaction that converts nitrogen oxides contained in the discharged insulating gas into nitrogen gas and oxygen gas.

12. The gas insulated equipment according to claim 1, comprising a plurality of the gas purifying devices, the plurality of gas purifying devices being connected in parallel with one another, each of the plurality of gas purifying devices having a second container through which the discharged insulating gas flows and a catalyst disposed in the second container, the catalyst of each of the plurality of gas purifying devices promoting a reaction that converts the carbon monoxide gas into the carbon dioxide gas, and the catalysts of the plurality of gas purifying devices having the same composition as one another.

13. The gas-insulated equipment according to claim 1, further comprising a pipe connected to the gas purifying device and extending from the gas purifying device to the outside of the gas-insulated equipment.

14. The gas insulated equipment according to claim 1, further comprising a gas recovery device connected downstream of the gas purification device, the gas recovery device recovering the insulating gas treated by the gas purification device.

15. Gas-insulated equipment comprising: a first container filled with insulating gas containing carbon dioxide gas; and a gas purifying device connectable to a gas inlet / outlet of the first container, wherein the gas-insulated equipment discharges the sealed insulating gas from the gas inlet / outlet when open to the atmosphere; the gas purifying device is attached to be connected to the gas inlet / outlet when open to the atmosphere, and reduces the amount of carbon monoxide gas contained in the insulating gas discharged from the first container and generated from the carbon dioxide gas due to discharge within the first container; and is detached to cut off the connection with the gas inlet / outlet when the gas-insulated equipment is in operation.

16. The gas-insulated equipment according to claim 15, which is a gas-insulated switchgear, a gas-insulated disconnector, a gas-insulated transformer, or a gas-insulated power transmission pipe.

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