JP2007288820A - Gas insulated electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas insulated electric apparatus in which an increase in global environmental load can be suppressed while keeping conduction performance. <P>SOLUTION: In the gas insulated electric apparatus where a circuit breaker 2, and disconnectors 4 and 5 are contained in enclosed containers, respectively, the circuit breaker 2 is arranged as a vacuum packaged vacuum circuit breaker 22 in an enclosed container 21 filled with CF<SB>3</SB>I gas or insulating gas containing CF<SB>3</SB>I gas, enclosed containers 40 and 52 of the disconnectors 4 and 5 generating a current interruption arc smaller than the interruption current of the vacuum circuit breaker 22 when an electrode is opened and closed is filled with CF<SB>3</SB>I gas or insulating gas containing CF<SB>3</SB>I gas, and a unit 100 having an adsorbent 101 for adsorbing iodine gas decomposed from insulating gas by arc is provided in the enclosed container 40, 52 of the disconnector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a gas-insulated electrical device that is used in a substation or switching station and is insulated with an electrically insulating gas, and more particularly to a gas-insulated switchgear suitable for suppressing global warming in consideration of the effect on global warming. It is.

In gas insulated switchgears at substations and switchyards, SF ₆ gas is used as the insulating gas sealed in the sealed container. This insulating gas is chemically stable, has extremely low toxicity, and has excellent electrical insulation performance and arc extinguishing performance.

However, the SF ₆ gas, but such problems with the destruction and toxicity of the ozone layer is not excellent gas, a drawback of the only global warming potential as high as 23900 times the C0 ₂ is on environmental issues, In recent years, gas containing trifluoromethane iodide (CF ₃ I) has been used as an alternative insulating gas due to environmental problems (see, for example, Patent Document 1).

JP 2000-166033 A

CF ₃ I described above is a gas at room temperature, has a higher dielectric strength than SF ₆ , and has a very low global warming potential. Therefore, this CF ₃ I gas or a gas of CF ₃ I and a mixed gas (hereinafter referred to as “CF ₃ I”) If CF ₃ I-containing gas) is used as an insulating gas in a gas-insulated electric device, it is possible to provide a gas-insulated electric device that has excellent electric insulation and can suppress the influence on global warming.

The above gas has the above-mentioned advantages, but has been found to have the following problems. That is. When the above gas is enclosed in a closed container having a switch, iodine in the CF ₃ I molecule is decomposed by the light and heat of the arc generated during the opening / closing operation of the switch, and a single iodine gas is contained in the closed container. Occurs.

  When this iodine gas is in a sealed container having a switch, it adheres to the inner surface of the sealed container and the movable contact and the fixed contact in the sealed container. This iodine is similar to chlorine and bromine, but has a similar chemical action. Therefore, as described above, when adhering to the movable contact and the fixed contact in the sealed container, There is a grudge that the fixed contact is corroded and the energization performance is lowered.

  The present invention has been made based on the above-described matters, and an object of the present invention is to provide a gas-insulated electrical apparatus that can suppress an increase in global environmental load and can maintain current-carrying performance.

To achieve the above object, according to a first aspect of the present invention, there is provided a gas-insulated electrical apparatus including a switch in a sealed container, wherein the sealed container is filled with an insulating gas containing CF ₃ I gas or CF ₃ I-containing gas; And an adsorbing device provided with an adsorbent that adsorbs a low decomposition gas from the insulating gas.

According to a second aspect of the present invention, there is provided a gas-insulated electrical apparatus including a switch in a sealed container, the sealed container in which an insulating gas containing a CF ₃ I gas or a CF ₃ I-containing gas is sealed, and the sealed container. And an adsorption device equipped with an adsorbent that adsorbs iodine gas decomposed and generated from the insulating gas.

Furthermore, a third invention is a gas insulated electrical apparatus having a switch in a sealed container, the sealed container in which an insulating gas by CF ₃ I gas or CF ₃ I-containing gas is sealed, and the sealed container is provided in the sealed container. And an adsorbing device having an adsorbent that adsorbs hydrogen iodide gas combined with iodine gas decomposed from the insulating gas.

  Furthermore, a fourth invention is the hydrogen fluoride generated in the second or third invention by hydrogen iodide gas combined with iodine gas from the insulating gas, the insulating gas, and trace moisture in the sealed container. An adsorbing device including an adsorbent for adsorbing gas is provided.

  In a fifth aspect based on any one of the first to fourth aspects, the adsorbing device includes an adsorbent, a bag body that stores the adsorbent, the bag body, and the inside of the sealed container. And a container provided in the container.

Furthermore, a sixth aspect of the present invention, the circuit breaker, disconnecting switch, in a gas insulated electric apparatus is a gas insulated switchgear housed respectively in a sealed container a grounding device, CF ₃ I gas or CF the breaker as a vacuum circuit breaker ₃₎ Arranged in the sealed container filled with an insulating gas containing I gas, and arranged the disconnector and grounding device in the sealed container filled with an insulating gas containing CF ₃ I gas or CF ₃ I containing gas, An adsorption device for adsorbing iodine gas is provided in each sealed container of the disconnector and the grounding device.

The invention of seventh breaker, disconnecting switch, in a gas insulated electric apparatus is a gas insulated switchgear housed respectively in a sealed container a grounding device, CF ₃ I gas or CF the breaker as a vacuum circuit breaker ₃₎ Arranged in the sealed container filled with an insulating gas containing I gas, and arranged the disconnector and grounding device in the sealed container filled with an insulating gas containing CF ₃ I gas or CF ₃ I containing gas, An adsorbing device including an adsorbent that adsorbs hydrogen iodide gas combined with iodine is provided in each sealed container of the disconnector and the grounding device.

  Furthermore, an eighth invention is the sixth or seventh invention, wherein an adsorbing device having an adsorbent for adsorbing hydrogen fluoride gas combined with iodine is provided in each sealed container of the disconnector and the grounding device. It is characterized by that.

The ninth invention relates to a gas-insulated electrical device that is a gas-insulated switchgear in which a circuit breaker and a disconnecting device are housed in sealed containers, respectively, and the circuit breaker is used as a vacuum circuit breaker and contains CF ₃ I gas or CF ₃ I. CF ₃ I gas or CF ₃ I is contained in the closed container of the disconnector that is placed in the sealed container filled with the insulating gas by the gas and generates a current breaking arc smaller than the breaking current of the vacuum circuit breaker when the electrode is opened and closed An insulating gas is sealed, and an adsorbent that adsorbs iodine gas decomposed from the insulating gas by the arc is provided in a sealed container of the disconnector.

According to the gas-insulated electrical apparatus of the present invention, the use of CF ₃ I gas or CF ₃ I-containing gas as an insulating gas has a low global warming coefficient, excellent arc extinguishing performance and electrical insulation performance, and CF ₃ I By adsorbing iodine gas decomposed and generated from gas or CF ₃ I-containing gas, it is possible to provide a gas-insulated electrical apparatus with good current-carrying performance.

Hereinafter, embodiments of the gas-insulated electrical apparatus of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal side view showing an embodiment of a cubicle type gas insulated switchgear which is a gas insulated electrical apparatus of the present invention. In FIG. 1, a bus 1, a circuit breaker 2, a line-side cable 3, a bus-side disconnector 4, a line-side disconnector 5, and a circuit breaker operator 6 are provided on a gas insulated switchgear base 1. A housed circuit breaker operation box 7 and a gas monitoring box 8 are provided.

  A gas monitoring box 8 is fixed to the front side of the gas insulated switchgear base 1. On this gas monitoring box 8, a circuit breaker operation box 7 in which the circuit breaker operation device 6 is accommodated is fixed. On the gas insulated switchgear base 1 on the back side of the circuit breaker operation box 7, a circuit breaker 2 is provided by a gantry 20. The bus bar 1 is connected to one side of the circuit breaker 2 (upper side in FIG. 1) via the bus bar side disconnector 4. The line side cable 3 is connected to the other side (lower side in FIG. 1) of the circuit breaker 2 via the line side disconnector 5.

  The bus 1 described above includes a bus container 10, a three-phase bus conductor 11 disposed in the bus container 10 in a direction perpendicular to the paper surface of FIG. 1, and a left-hand direction of FIG. 1 from these bus conductors 11. And a branched branch bus 12. This busbar container 10 is fixed to the busbar side disconnector container 40 of the busbar side disconnector 4 via an insulating spacer 13.

  The bus-side disconnector container 40 of the bus-side disconnector 4 is fixed to the circuit breaker container 21 of the circuit breaker 2 through an insulating spacer 41 for maintaining airtightness. The busbar side disconnector container 40 includes a fixed electrode 42 connected to the branch busbar 12 and a movable electrode 43 contacting and separating from the fixed electrode 42. Three fixed electrodes 42 and three movable electrodes 43 are arranged in parallel in the direction perpendicular to the paper surface of FIG.

  The circuit breaker 2 described above includes a circuit breaker container 21 fixed on the gantry 20, and three vacuum circuit breakers 22 arranged in parallel in the circuit breaker container 21 in the vertical direction and in the direction perpendicular to the plane of FIG. ing. The vacuum circuit breaker 22 includes a vacuum circuit breaker container 23 whose interior is maintained in a vacuum state, a fixed electrode 24 provided on the vacuum circuit breaker container 23, and a movable electrode 25 that contacts and separates from the fixed electrode 24. Yes. The movable electrode 43 side of the bus-side disconnector 4 is connected to the fixed electrode 24 in the vacuum circuit breaker container 23. The movable electrode 25 in the vacuum circuit breaker container 23 is connected to the line side disconnector 5. The vacuum circuit breaker 22 is opened and closed by the circuit breaker operating device 6 housed in the circuit breaker operating box 7.

  The line-side disconnector 5 is connected to the circuit breaker container 21 via the insulating spacer 50 and is connected to the line-side disconnector container 52 fixed on the gantry 51 and the movable electrode 25 in the vacuum circuit breaker container 23. A movable electrode 53 and a fixed electrode 54 with which the movable electrode 53 contacts and separates are provided. Three fixed electrodes 54 and three movable electrodes 53 are arranged in the line-side disconnector container 52 in a direction perpendicular to the plane of FIG. Each fixed electrode 54 is connected to the line-side cable 3 via an insulating spacer 55 provided between the line-side disconnector container 52 and the line-side cable 3. A grounding device 56 is provided in the line side disconnector container 52.

  The line side cable 3 is connected to the cable head 30 connected to the fixed electrode 54 of the line side disconnector 5 and is drawn downward. A measuring current transformer 31 is provided on the outer periphery of the cable 3.

The above-described busbar container 10, the circuit breaker container 21, the busbar side disconnector container 40, and the line side disconnector container 52 form a partitioned space in which the inside is sealed, and in these partitioned spaces, CF is used as an insulating gas. ₃ I gas or CF ₃ I containing gas is enclosed. This CF ₃ I gas or CF ₃ I-containing gas is excellent in electrical insulation and has a function of suppressing global warming. As the mixed gas, nitrogen gas, carbon dioxide gas, or the like is mixed in order to suppress liquefaction of CF ₃ I.

Of the busbar container 10, the circuit breaker container 21, the busbar side disconnector container 40, and the line side disconnector container 52 described above, in particular, in the busbar side disconnector container 40 and the line side disconnector container 52, the fixed electrode 42. And an open / close portion made up of the movable electrode 43, an open / close portion made up of the movable electrode 53 and the fixed electrode 54, and a grounding device 56 in the line-side disconnector container 52. These open / close portions generate an arc when the electrodes are brought into contact with each other in the atmosphere of the CF ₃ I gas and the mixed gas in each sealed container. This arc generates a single iodine decomposition gas from the CF ₃ I-containing gas in a sealed container. In order to adsorb this single iodine decomposition gas, the bus side disconnector container 40 and the line side disconnector Each container 52 is provided with an adsorption device 100.

  In this example, the suction device 100 provided in the bus-side disconnector container 40 is fixed to the inner surface of the lid 44 of the bus-side disconnector container 40 because of its installation space. Moreover, the adsorption | suction apparatus 100 provided in the track side disconnector container 52 is mounted on the bottom face of the track side disconnector container 52 on the relationship of the installation space.

  2 and 3, for example, the adsorbing apparatus 100 described above holds an adsorbent 101 such as activated carbon, a breathable bag 102 containing the adsorbent 101, and the bag 102. The container is composed of a base 103 and a cylindrical body 104 fixed on the base 103 by welding or the like. A breathable bag body 102 containing the adsorbent 101 is housed in a space formed by a base 103 and a cylindrical body 104 fixed on the base 103 by welding or the like. The adsorbent 101 in the bag body 102 communicates with each sealed container via a vent hole 105 provided in the bag body 102 and the cylindrical body 104.

  In the suction device 100 described above, the bolt hole 106 for fixing to the inner surface of the lid 44 is provided in the base 103. However, the bolt hole 106 may be omitted when it is placed in an airtight container. it can.

Next, the operation of an embodiment of the cubicle type gas insulated switchgear as the above-described gas insulated electrical apparatus of the present invention will be described.
The above-described gas-insulated switchgear shuts off the vacuum circuit breaker 22 in the circuit breaker 2 when an overcurrent occurs on the line side cable 3 side, prevents the overcurrent from being transmitted to the bus 1, and gas-insulated switchgear. During maintenance and inspection of the apparatus, the vacuum circuit breaker 22 in the circuit breaker 2 is disconnected, the bus-side disconnector 4 and the line-side disconnector 5 provided separately from the circuit breaker 2 are opened, and the grounding device 56 is grounded. As a result, the residual charge and induced current on the power supply side are caused to flow to the ground, and re-application from the power supply side is prevented, thereby ensuring the safety of the operator.

During the maintenance inspection of the gas insulated switchgear described above, the fixed electrode 42 and the movable electrode 43 of the bus-side disconnector 4, the fixed electrode 54 and the movable electrode 53 of the line-side disconnector 5, and the grounding device 56 are further connected. , Respectively, and an arc is generated in the atmosphere of the CF ₃ I-containing gas in each of the sealed containers 40 and 52.

The CF ₃ I-containing gas exhibits arc extinguishing performance and electrical insulation performance against this arc generation. On the other hand, CF ₃ I-containing gas, the energy of the arc, a decomposition gas of iodine molecules of CF ₃ I in CF ₃ I-containing gas, to dissociate from CF ₃ I.

The dissociated iodine gas is adsorbed by the adsorbent 101 of the adsorption device 100. As a result, since the CF ₃ I-containing gas atmosphere in each of the sealed containers 40 and 52 can be maintained in a pure state, arc extinguishing performance and electrical insulation performance in the bus-side disconnector 4 and the line-side disconnector 5 Can be maintained.

  Further, since the adhesion of iodine gas to the fixed electrode 42 and the movable electrode 43 of the bus-side disconnector 4 and the fixed electrode 54 and the movable electrode 53 of the line-side disconnector 5 can be suppressed, the energization performance is not deteriorated. Can be maintained. Furthermore, since the iodine decomposition gas can be prevented from adhering to the inner surfaces of the sealed containers 40 and 52, the corrosion of the inner surfaces of the sealed containers 40 and 52 can also be suppressed. is there.

As described above, according to one embodiment of the present invention, the use of CF ₃ I gas or CF ₃ I-containing gas as an insulating gas has a low global warming potential, and arc extinguishing performance and electrical insulation performance. A gas-insulated switchgear having excellent current-carrying performance can be provided by adsorption of iodine decomposition gas from CF ₃ I gas or CF ₃ I-containing gas. Further, it is possible to provide a gas insulated switchgear having a size equal to or smaller than that in the case of using the conventional SF ₆ insulating gas.

FIG. 4 is a longitudinal sectional side view showing another embodiment of a cubicle type gas insulated switchgear which is a gas insulated electrical apparatus of the present invention. In FIG. 4, the same reference numerals as those in FIGS.
In this embodiment, the moisture adhering to the inside of the sealed container is also adsorbed together, and the circuit breaker container 21 of the circuit breaker 2 is provided with a moisture absorption device 200 having a moisture absorbent such as silica gel and zeolite, In the bus-side disconnector container 40 and the line-side disconnector container 52, an adsorption device 300 provided with a hygroscopic agent such as silica gel and zeolite and an iodine adsorbent such as activated carbon is provided.

The hygroscopic device 200 is configured by putting a hygroscopic agent in a bag and storing the bag in a container, similar to the adsorbing device 100 described above. Moreover, although the structure of the adsorption | suction apparatus 300 is shown in FIG.5 and FIG.6, the thing of the same code | symbol as the code | symbol of FIG.2 and FIG.3 is the same part in these figures.
In FIG.5 and FIG.6, the inside of the cylindrical body 104 which comprises the adsorption | suction apparatus 300 is divided into 2 by the partition 107, and 2 chambers are formed. A bag body 301 containing a hygroscopic agent is provided in one chamber, and a bag body 102 containing the iodine adsorbent 101 shown in FIGS. 2 and 3 is provided in the other chamber. Further, when the particle diameters of the hygroscopic agent and the iodine adsorbent are greatly different, the adsorption area is increased and the adsorption effect can be enhanced by storing them in different containers.

According to this embodiment, as in the above-described embodiment, the use of CF ₃ I gas or CF ₃ I-containing gas as an insulating gas has a low global warming potential, and arc extinguishing performance and electrical insulation performance. It is possible to provide a gas-insulated switchgear having excellent current-carrying performance due to adsorption of iodine decomposition gas and moisture from CF ₃ I gas or CF ₃ I-containing gas.

Note that iodine and fluorine decomposed from CF ₃ I gas or CF ₃ I-containing gas may generate hydrogen iodide gas and hydrogen fluoride gas by combining with moisture in the sealed container. Can be adsorbed by the adsorbent 101 of the adsorption device 100, and in this case, the same effect as that of the above-described embodiment can be obtained.

  Furthermore, in the above-described embodiment, the adsorbent 101 and the hygroscopic agent are stored in the bag in consideration of the convenience of scattering and recovery of the adsorbent 101 and the hygroscopic agent, but without using the bag body 102, It is also possible to directly store the adsorbent 101 and the hygroscopic agent in a space formed by the base 103 and the cylindrical body 104 on the base 103. Further, without using a holding container composed of the base 103 and the cylindrical body 104 on the base 103, a bag body 102 containing the adsorbent 101 and a bag body 301 containing a hygroscopic agent are provided in the sealed container. It is also possible.

In the above-described embodiment, since the vacuum circuit breaker 22 of a vacuum-sealed type is provided in the circuit breaker container 21 of the circuit breaker unit, the electrode of the circuit breaker in which a large current break arc occurs is CF _3. Since there is no contact with I gas or CF ₃ I-containing gas, iodine gas is not generated in the sealed container, and a small current breaking arc at the time of switching that is smaller than the breaking current due to the breaker is generated. Since the CF ₃ I gas or the CF ₃ I-containing gas is sealed in each of the hermetic container and the hermetic container having the grounding device, iodine gas as a whole gas-insulated switchgear can be minimized.

As a result, as in the above-described embodiment, the global warming potential is small, the arc extinguishing performance and the electrical insulation performance are excellent, and the function of adsorbing iodine decomposition gas and moisture from CF ₃ I gas or CF ₃ I-containing gas. Thus, it is possible to provide a gas-insulated switchgear having good current-carrying performance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view showing an embodiment of a cubicle type gas insulated switchgear which is a gas insulated electrical device of the present invention. It is a front view which shows the adsorption | suction apparatus provided in one Embodiment of the cubicle type gas insulated switchgear which is the gas insulated electrical apparatus of this invention shown in FIG. 1 in a partial cross section. It is a top view of the adsorption | suction apparatus shown in FIG. It is a vertical side view which shows other embodiment of the cubicle type gas insulated switchgear which is the gas insulated electrical equipment of this invention. It is a front view which shows the adsorption | suction apparatus provided in one Embodiment of the cubicle type gas insulated switchgear which is the gas insulated electrical apparatus of this invention shown in FIG. 4 in a partial cross section. It is a top view of the adsorption | suction apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Busbar 2 Circuit breaker 3 Line side cable 4 Bus side disconnector 5 Line side disconnector 22 Vacuum circuit breaker 100 Adsorption device 101 Adsorbent 102 Bag body 200 Hygroscopic device 300 Adsorption device

Claims (9)

In a gas-insulated electrical apparatus provided with a switch in a hermetic container, the hermetic container in which an insulating gas by CF ₃ I gas or CF ₃ I-containing gas is sealed, and the low-resolution from the insulating gas provided in the hermetic container A gas-insulated electrical apparatus comprising an adsorption device including an adsorbent that adsorbs a gas. In a gas-insulated electrical apparatus having a switch in a hermetic container, the hermetic container in which an insulating gas containing CF ₃ I gas or CF ₃ I-containing gas is sealed, and provided in the hermetic container and decomposed from the insulating gas A gas-insulated electrical apparatus comprising an adsorption device including an adsorbent that adsorbs iodine gas. In a gas-insulated electrical apparatus having a switch in a hermetic container, the hermetic container in which an insulating gas containing CF ₃ I gas or CF ₃ I-containing gas is sealed, and provided in the hermetic container and decomposed from the insulating gas A gas-insulated electrical apparatus comprising an adsorbing device including an adsorbent that adsorbs hydrogen iodide gas combined with iodine gas.   An adsorbing device provided with an adsorbent for adsorbing hydrogen iodide gas combined with iodine gas from the insulating gas and hydrogen fluoride gas generated by the insulating gas and trace moisture is provided in the sealed container. The gas-insulated electrical apparatus according to claim 2 or 3.   The said adsorption | suction apparatus was comprised with the adsorbent, the bag body which accommodates this adsorbent, and the container which hold | maintains this bag body and is provided in the said airtight container, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. Gas-insulated electrical equipment according to crab. In a gas-insulated electrical device that is a gas-insulated switchgear in which a circuit breaker, a disconnecting device, and a grounding device are housed in a sealed container, the insulating circuit is made of CF ₃ I gas or CF ₃ I-containing gas using the circuit breaker as a vacuum circuit breaker. Arranged in the sealed container, the disconnector and the grounding device are respectively disposed in the sealed container filled with an insulating gas by CF ₃ I gas or CF ₃ I-containing gas, and each of the disconnector and grounding device A gas-insulated electrical apparatus comprising an adsorption device for adsorbing iodine gas in a sealed container. In a gas-insulated electrical device that is a gas-insulated switchgear in which a circuit breaker, a disconnecting device, and a grounding device are housed in a sealed container, the insulating circuit is made of CF ₃ I gas or CF ₃ I-containing gas using the circuit breaker as a vacuum circuit breaker. Arranged in the sealed container, the disconnector and the grounding device are respectively disposed in the sealed container filled with an insulating gas by CF ₃ I gas or CF ₃ I-containing gas, and each of the disconnector and grounding device A gas-insulated electrical apparatus comprising an adsorbing device provided with an adsorbent for adsorbing hydrogen iodide gas combined with iodine in a sealed container.   8. The gas-insulated electrical apparatus according to claim 6, wherein an adsorption device having an adsorbent that adsorbs hydrogen fluoride gas combined with iodine is provided in each sealed container of the disconnector and the grounding device. . In the gas-insulated electrical equipment that is a gas-insulated switchgear in which the circuit breaker and the disconnecting device are respectively housed in a sealed container, the circuit breaker is used as a vacuum circuit breaker, and the insulating gas is filled with CF ₃ I gas or CF ₃ I-containing gas Arranged in an airtight container, an insulating gas containing CF ₃ I gas or CF ₃ I-containing gas is sealed in the airtight container of the disconnector in which a current breaking arc smaller than the breaking current of the vacuum circuit breaker occurs when the electrode is opened and closed, A gas-insulated electrical apparatus, wherein an adsorbent that adsorbs iodine gas decomposed from the insulating gas by the arc is provided in a sealed container of the disconnector.

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