KR20070075278A - Gas insulated electrical machinery - Google Patents

Abstract

A gas insulated electric device is provided to prevent the insulation deterioration and improve the conducting performance by absorbing the moisture and using a mixture gas containing the CF3I. A gas insulated electric device includes a sealed vessel, a vacuum breaker(22) and a disconnector. An insulated gas is inserted and sealed into the sealed vessel. The vacuum breaker(22) and the disconnector are installed to be electrically insulated from the sealed vessel. The vacuum breaker does not expose arc light outward from the vacuum vessel in current-breaking. The insulated gas is a mixed gas having CF3I over 40%, and another insulated gas of which a GWP(Global Warming Potential) is smaller than SF6. A gas pressure of the mixed gas is 0.1-0.3MPa.abs.

Description

GAS INSULATED ELECTRICAL MACHINERY}

1 is a partial cross-sectional view of a gas insulated switchgear according to an embodiment of the present invention;

2 is a partial cross-sectional view of a gas insulated switchgear according to another embodiment of the present invention;

3 is a longitudinal side view showing an embodiment of a cubicle type gas insulated switchgear which is a gas insulated electric machine according to an embodiment of the present invention;

4 is a front view showing, in partial cross section, an adsorption device provided in one embodiment of the gas insulated switchgear of the present invention shown in FIG. 3;

5 is a plan view of the adsorption device shown in FIG. 4;

6 is a longitudinal side view showing another embodiment of a cubicle type gas insulated switchgear which is a gas insulated electric machine according to another embodiment of the present invention;

7 is a side view showing another embodiment of the adsorption device;

8 is a plan view of the adsorption device of FIG. 7.

※ Explanation of code for main part of drawing

1: busbar 2: breaker

3: Line side cable 4: Bus side disconnector

5: line disconnector 22: vacuum breaker

100: adsorption device 101: adsorbent

102: bag 200: moisture absorption device

300: adsorption device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated electric device insulated with electric insulating gas used in a substation or switchgear, and more particularly, to a gas insulated switchgear suitable for suppressing warming in consideration of the effect on global warming.

In the gas insulated switchgear in substations and switching stations, SF ₆ gas was used as the insulating gas enclosed in the sealed container. This insulating gas is chemically stable, extremely low in toxicity, and has excellent electrical insulation and arc extinguishing performance.

However, SF ₆ gas has no problems with the destruction of the ozone layer or toxicity, but it is an excellent gas, but the disadvantage that the only global warming coefficient is 23,900 times that of CO ₂ is an environmental problem. Gas containing trifluoromethane (CF ₃ I) has been used (see Patent Document 1, for example).

[Patent Document 1]

Japanese Patent Application Laid-Open No. 2000-166033

Since CF ₃ I has a boiling point of -22.5 ° C, is a gas at room temperature, has a higher dielectric strength than SF ₆ , and has a very small global warming coefficient, the CF ₃ I is a mixed gas of CF ₃ I and another insulating gas (hereinafter referred to as CF _{3 I).} By using I-containing mixed gas) as an insulating gas for a gas insulated electric device, it is possible to provide a gas insulated electric device which is excellent in electric insulation and can suppress the influence on global warming.

While the above gas has the above advantages, it has been found to have the following disadvantages. That is, when the above-mentioned gas is enclosed in an airtight container having a switchgear, the molecules of CF ₃ I are decomposed by arc light and heat generated during the opening / closing operation of the switchgear to generate iodine gas or fluorine gas. Sun or fluorine gas may react with traces of moisture in a sealed container to produce hydrogen iodide gas or hydrogen fluoride gas.

When this iodine gas, fluorine gas, hydrogen iodide gas, or hydrogen fluoride gas is in the sealed container which has a switchgear, it is attached to the inner surface of a sealed container, the movable contact in a sealed container, and a fixed contact. These iodine and fluorine have similar chemical properties to those of chlorine and bromine. As described above, in particular, when attached to the movable contact and the fixed contact in the sealed container there is a regret that the movable contact and the fixed contact is corroded to reduce the conduction performance.

This invention is made | formed based on the above-mentioned matter, and an object of this invention is to provide the gas insulated electric apparatus which can suppress the increase of global environmental load, and does not deteriorate an electricity supply performance.

The present invention provides a gas insulated switchgear comprising a sealed container in which insulating gas is sealed and a vacuum circuit breaker and a disconnecting device installed in the sealed container in an electrically insulated state from the sealed container. Is a light-shielding type that does not leak arc light out of a vacuum container, and the insulating gas is composed of CF ₃ I or more by volume ratio and another insulating gas having a liquefaction temperature lower than that of CF ₃ I and a global warming coefficient lower than SF ₆ . It is a mixed gas and provides the gas insulated electric equipment characterized by the gas pressure of this mixed gas being 0.1-0.3 Mpa * abs.

In addition, the present invention is a low-pressure container is formed in the airtight container encapsulated with a mixture gas of CF ₃ I and other insulating gas, and installed in the airtight container and produced by decomposition of the insulating gas and / or reaction in the airtight container. The present invention provides a gas insulated electric apparatus comprising an adsorption device having an adsorbent for selectively adsorbing molecular weight gas.

Best Mode for Carrying Out the Invention Best embodiments of the present invention are collectively described below.

(1) A gas insulated electric machine comprising a sealed container insulated with insulating gas and a vacuum circuit breaker and a disconnecting device installed in the sealed container in an electrically insulated state from the sealed container, wherein the vacuum circuit breaker is arced when the current is interrupted. Light-shielding type that does not leak light out of the vacuum container, and the insulating gas is a mixture of CF ₃ I or more by volume ratio and another insulating gas having a liquefaction temperature lower than that of CF ₃ I and a global warming coefficient lower than SF _6. Gas, which has a gas pressure of 0.1 to 0.3 MPa · abs. It is preferable that other insulating gases have a lower boiling point than CF ₃ I, are electrically insulating, and are less difficult to decompose than CF ₃ I as non-condensation or low condensation. Examples thereof include air, nitrogen, and carbon dioxide, and nitrogen is particularly preferable.

(2) In the gas insulated electric machine, the mixed gas contains 40 to 70% of CF ₃ I by volume, and the balance is another insulating gas. If CF ₃ I is less than 40%, insulation is insufficient, and if it exceeds 70%, condensation may be a problem.

(3) In the gas insulated electric machine, the other insulating gas is at least one selected from air, carbon dioxide, and nitrogen. These are preferably highly dried.

(4) In the gas insulated electric machine, the other insulating gas is nitrogen, CF ₃ I is 40 to 70% by volume, and the other insulating gas is residual.

(5) In the gas insulated electric machine, the gas insulated device is provided with a plurality of sealed containers, each sealed container is arranged to be electrically connected to constitute a gas insulated device, and the insulation of each sealed container is provided. The gas has a different mixing ratio between CF ₃ I and another insulating gas. As a result, gas insulation suitable for the use conditions of each switch can be realized.

(6) In the gas insulated electric machine, the gas pressure of the insulated gas of the respective sealed containers is different, and is designed to be a gas pressure suitable for each switch. As a result, gas insulation suitable for the use conditions of each switch can be realized.

(7) In the gas insulated electric device, the sealed container in which a mixed gas of CF ₃ I and other insulating gas is sealed in the sealed container, the gas provided by decomposition of the insulating gas and / or sealed in the sealed container. An adsorbent for selectively adsorbing low molecular weight gas generated by the reaction in the vessel. The adsorbent preferably adsorbs low molecular weight substances present in the closed vessel.

(8) In the gas insulated electric apparatus, the low molecular weight gas generated by the reaction in the cracked gas and / or the sealed container contains at least one of iodine gas, fluorine gas, hydrogen iodide gas, and hydrogen fluoride gas.

(9) In the gas insulated electric machine of (1) to (6), the adsorbent is activated carbon.

(10) The gas insulated electric machine of (1) to (9), wherein a moisture adsorbent for adsorbing moisture in at least one sealed container is provided in the sealed container.

(11) In the gas insulated electric apparatus of (l) to (9), the adsorption device includes an adsorbent, a bag for storing the adsorbent, and a container for holding the bag and installed in the sealed container. that.

(12) In the gas insulated electric machine of (1) to (9), the breaker is a vacuum circuit breaker, and the gas is in a sealed container enclosed insulated gas by CF ₃ I-containing mixed gas, and the circuit breaker and the grounding device. a, CF ₃ I, each disposed in a said closed container filled with an insulating gas by a mixed gas containing, and the reaction in the CF ₃ I decomposition and / or the closed vessel in each of the hermetically sealed container of said disconnecting switch and the earthing switch The adsorbent which adsorb | suck the low molecular weight gas produced | generated by this was provided.

(13) In the gas insulated electric equipment of (1) to (9), the low volume produced by the decomposition of CF ₃ I of the mixed gas and / or the reaction in the sealed container in a sealed container accommodating the breaker. An adsorbent for selectively adsorbing molecular weight gas was installed in a sealed container of a disconnecting device and a grounding device.

(14) In the gas insulated electric machine, an adsorbent for adsorbing a small amount of moisture in the sealed container is provided in each sealed container of the breaker, disconnector, and grounding device.

(15) In the gas insulated electric machine provided with the adsorbent, the insulating gas is composed of CF ₃ I of 40% or more by volume ratio and other insulating gas having a liquefaction temperature lower than that of CF ₃ I and a global warming coefficient lower than SF ₆ . It is a mixed gas formed, and the gas pressure of this mixed gas was 0.1-0.3 MPa * abs.

(16) In the gas insulated electric machine provided with the adsorbent, the mixed gas contains 40 to 70% of the CF ₃ I by volume, and the balance is another insulating gas.

(17) In the gas insulated electric machine provided with the adsorbent, the other insulating gas is at least one selected from dry air, carbon dioxide, and nitrogen.

(18) In a gas insulated electric machine provided with the adsorbent, at least one of the sealed containers includes an adsorbent for selectively adsorbing a gas generated by decomposition of the insulating gas and / or a low molecular weight gas generated by a reaction in the closed container. Equipped with.

(19) In the gas insulated electric machine provided with the adsorbent, the low molecular weight gas generated by the reaction in the cracked gas and / or the sealed container is at least one of iodine gas, fluorine gas, hydrogen iodide gas, and hydrogen fluoride gas. It contains.

(20) In the gas insulated electric machine provided with the adsorbent, the adsorbent is activated carbon.

(21) In a gas insulated electric machine provided with the adsorbent, a moisture adsorbent for adsorbing moisture in the hermetic container is provided in the hermetic container.

(22) In a gas insulated electric machine provided with the adsorbent, the adsorbent comprises an adsorbent, a bag for storing the adsorbent, and a container holding the bag and installed in the sealed container.

Other insulating gas to be mixed with the CF ₃ I, the warming coefficient than SF ₆ gas is small, had a boiling point below the CF ₃ I, and the insulating property, so that condensable or of the non-condensable gas, for example air, nitrogen gas Carbon dioxide gas is used. They are used highly dry or dehumidified.

According to the gas insulated electric device of the present invention, the use of CF ₃ I-containing mixed gas as the insulating gas has a low global warming coefficient, excellent arc extinguishing performance and electrical insulation performance, and a CF ₃ I gas or a CF ₃ I-containing gas. By selectively adsorbing and removing at least one of iodine gas, fluorine gas, hydrogen iodide gas and hydrogen fluoride gas generated from decomposition, and adsorbing and removing water if necessary, it is possible to provide a gas insulated electric device having good conduction performance.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the gas insulated electric equipment of this invention is described using drawing.

1 is a partial cross-sectional view showing a gas insulated switchgear according to an embodiment of the present invention. The gas insulated switchgear configured as a general-use power receiving unit is constructed by supporting a high voltage conductor in an electrically insulated state from an hermetic container by an insulating support in an hermetic container filled with insulating gas for each gas division. In the first hermetically sealed container 1, a vacuum circuit breaker 2 is disposed, and the cable head 5 connects the high voltage conductor 4 connected to one end of the vacuum circuit breaker 2 via the disconnector 3. 1 It is insulated and drawn out of the airtight container 1, and is connected to the cable 5. As shown in FIG. In the first hermetic container 1, a grounding switch 7 for grounding the high voltage conductor therein is also provided. The high-voltage conductors in the first hermetically sealed container 1 constituting these vacuum circuit breakers 2, the disconnectors 3, the ground switch 7, and the like are properly positioned at the first hermetically sealed container 1 by the insulating support 8. It is supported in an electrically insulated state.

The other end of the vacuum circuit breaker 2 is introduced into the second airtight container 9 which is separated by gas and provided with an insulating spacer 10 between the first airtight container 1, and the busbar side breaker 11 is provided. Is connected to one end of the bus bar, and the other end of the bus bar disconnector 11 is connected to the main bus side separated from the second hermetically sealed container 9 by the insulating spacer 13 via the conductor 12. have. In the bus-side disconnecting unit 11, the high voltage conductor in the second hermetically sealed container 9 is supported in an electrically insulated state from the second hermetically sealed container 9 by the insulating support 14. The movable electrode side of the vacuum circuit breaker 2, the movable contact side of the disconnector 3, the movable ground contact side of the ground switch 7, and the movable contact side of the bus bar disconnector 11 are provided with a link mechanism (not shown). It is connected to each manipulator which was guide | induced through the holding | maintenance of the 1st airtight container 1 and the 2nd airtight container 9, and arrange | positioned in the operating panel 15, respectively.

The vacuum circuit breaker 2 disposed in the first hermetically sealed container 1 creates a vacuum container with opaque ceramics, arranges a fixed electrode and a movable electrode therein, and maintains the degree of vacuum in the vacuum container during the opening and closing operation of the movable electrode. Shielding type vacuum circuit breaker (2), which is constructed by using bellows to allow the operation of movable electrode, or shielding or covering arc light so that it does not leak out of the vacuum container even if a vacuum container is made of transparent ceramics or glass (2) I'm using. The gas insulated switchgear is a three-phase collective type in which three phases are collectively arranged.

A first closed vessel (1) and a second closed vessel (9) in, respectively, and charging the mixed insulating gas, and the mixed insulating gas are both CF ₃ I of 65% by volume ratio of each gas compartment, than SF ₆ It is a mixture of 35% nitrogen gas with a low global warming coefficient and a lower liquefaction temperature than CF ₃ I. The gas pressure is 0.17 MPa · abs.

CF ₃ I as described above, is from about 1.1 to 1.3 times the amount of the SF ₆ gas insulation strength of the gas pressure 0.1 MPa · abs as compared with SF ₆ gas. The rated gas pressure of the phenomenon of the gas insulated switchgear using SF ₆ gas is generally about 0.2 MPa · abs or more. For example, a gas insulated switchgear using SF ₆ gas of 0.17 MPa · abs as the insulating medium is used. In order to achieve an equivalent dielectric strength using CF ₃ I, it is necessary to set the rated gas pressure to 0.15 MPa · abs or more, assuming that the dielectric strength of CF ₃ I is about 1.1 times that of SF ₆ gas.

However, under the pressure of 0.15 MPa · abs, since the liquefaction temperature of CF ₃ I is about -10 ° C, the application range is limited because it cannot be used at -20 ° C, which is the general ambient temperature specification for gas insulated switchgear. Therefore, in order to address the specifications for the -20 ℃ global warming coefficient smaller than SF _6, it is possible by using corresponding mixed with the liquid temperature is lower than the insulating gas CF ₃ I CF ₃ I. SF ₆ for example of phenomenon Considering the mixing ratio without liquefying at the ambient temperature of -20 ° C at the rated gas pressure of 0.17 MPa · abs, which is about the same as the gas pressure, in the case of the mixed gas of CF ₃ I and nitrogen gas, CF ₃ I is 65% by volume, When nitrogen gas is used at a mixing ratio of 35%, the liquefaction temperature is about -20 ° C, and SF ₆ Compared to the development of gas, the dielectric strength is improved by several percent.

Moreover, in order to obtain the equivalent insulation performance by setting the rated gas pressure at 0.17 MPa · abs at the same gas pressure as that of SF ₆ gas, for example, a mixed gas containing 50% of CF ₃ I by volume and about 50% of nitrogen gas may be used. . In the case where the liquefaction temperature is set to a cold specification special specification corresponding to −30 ° C., for example, CF ₃ I may be used as a mixed gas having a volume ratio of 40% and nitrogen gas of about 60%. Therefore, if at least CF ₃ I is set to 40% or more by volume ratio, and a mixed gas containing another insulating gas having a lower global warming coefficient than SF ₆ and a lower liquefaction temperature than CF ₃ I is used, The developing specification can be fully satisfied.

As an insulating gas enclosed in the sealed container 1 in which the vacuum circuit breaker 2 is disposed, CF ₃ I is made into 40% or more by volume ratio, and the liquefaction temperature is lower than that of CF ₃ I and the global warming coefficient is SF _6. As the insulating gas smaller than the gas, for example, a mixed gas containing nitrogen gas is used, the liquefaction temperature is lowered while maintaining the insulating performance equal to or higher than that of the case where SF ₆ gas is used as the insulating gas. In addition, it is possible to obtain a gas insulated switchgear which can be made compact while using an insulating gas having a small contribution to global warming without increasing the gas pressure as compared with the case where no conventional mixed gas is used.

In this way, since the predetermined performance can be satisfied without increasing the gas pressure in the sealed container 1 in which the breaker is arranged, for example, if the rated gas pressure is approximately equal to that of the developed product, the vacuum of the vacuum circuit breaker 2 is reduced. Since the airtightness and mechanical strength are also the same as those of the conventional design, the gas insulated switchgear of the prepaid product is replaced with SF ₆ gas, which is an insulating gas, and the gas pressure is 0.17 MPa · abs, and the mixed gas of CF ₃ I and nitrogen gas. Easily realize a gas insulated switchgear with a small contribution to global warming.

On the other hand, since the dielectric strength of the mixed gas of CF ₃ I and nitrogen gas is improved by several percent compared with the conventional product, when manufacturing it as a new gas insulated switchgear, it is possible to realize a compact product as compared with the conventional one, and also insulate gas. Liquefaction temperature of about -20 ℃, can meet the general specifications of gas insulated switchgear.

As described above, CF ₃ I is easily decomposed into light, and its lifetime is one day or less in the air. Even if it leaks to the outside from the first hermetically sealed container 1 or the second hermetically sealed container 9, There is little adverse effect on the natural environment. In the gas insulated switchgear, since the sealed container filled with the insulating gas is made of an opaque metal, the CF ₃ I in the sealed container is not decomposed by sunlight in the normal state, and stable insulation performance can be maintained. However, considering the use of the gas insulated switchgear, the vacuum circuit breaker 2 cuts off an accidental current of several tens of kA, so it can be considered that CF ₃ I is decomposed by the arc light at the time of interrupting the current. Therefore, the vacuum container of the vacuum circuit breaker 2 arrange | positioned in the 1st airtight container 1 is made of opaque ceramics, and the fixed electrode and the movable electrode are arrange | positioned inside it. When the opening and closing operation of the movable electrode is made of a light impermeable material that maintains the degree of vacuum in the vacuum container to allow the operation of the movable electrode, and also prevents arc light from leaking outside of the vacuum circuit breaker, transparent ceramics or Even if a vacuum vessel is made of glass, arc light does not leak out of the vacuum vessel. A light shielding vacuum circuit breaker is constituted as described above.

When the gas insulated switchgear is configured using the light-shielding vacuum circuit breaker as described above, an arc is generated in the vacuum chamber of the light-shielding vacuum circuit breaker 2 when the current is interrupted. CF ₃ I in the shell) is not decomposed and a gas insulated switchgear having stable insulation performance can be obtained.

In the case of civil gas insulated switchgear, the bus-side disconnector 11 only interrupts current by about 0.2 A residual charge, and little consideration is given to decomposition of CF ₃ I by arc light. However, in the case of the high-voltage large-capacity power gas insulated switchgear, for example, when the 1200 A loop current is interrupted by the bus-side disconnector 11, the CF ₃ I is decomposed by the arc light at the time of the loop current interruption. Need to be considered.

In this case, what is necessary is just to be comprised like the gas insulated switchgear of embodiment shown in FIG. The same reference numerals as those in the above embodiment are given the same reference numerals, and detailed descriptions are omitted, but the vacuum disconnector 3a is used as the disconnector 3 and the vacuum disconnector 11a is used as the busbar disconnector 11. If necessary, a vacuum ground switch 7a is used as the ground switch 7. As each vacuum switch, a vacuum container is made of opaque ceramics. It has a bellows which arrange | positions a fixed electrode and a movable electrode in it, maintains the degree of vacuum in a vacuum container at the time of opening / closing operation of a movable electrode, and permits operation | movement of a movable electrode. If the bellows is a material which does not transmit light, the vacuum container may be made of transparent ceramics or glass. As the vacuum breaker or the vacuum ground switch, it is possible to select and use the one corresponding to the used voltage or the breaking current from among those known as a vacuum breaker or a vacuum breaker.

According to the gas insulated switchgear of such a structure, even if an arc generate | occur | produced in the vacuum vessel of the light-shielding vacuum circuit breaker 2 at the time of electric current interruption, and in the vacuum vessel of the other disconnectors 3 and 11, respectively. Since the light of the arc does not leak into the first hermetically sealed container 1 as a light shielding type, CF ₃ I in the first hermetically sealed container 1 is not decomposed, and a gas insulated switchgear having stable insulation performance can be provided. .

3 is a partial cross-sectional view showing a gas insulated switchgear according to another embodiment of the present invention.

A power gas insulated switchgear having a high voltage class is shown in the civil gas insulated switchgear according to the above-described embodiment, and the vacuum breaker 22 is disposed in the first sealed container 80, and the vacuum breaker 22 is provided. Is supported in an electrically insulated state from the first hermetically sealed container 80 by a suitable insulating support 81. A pair of upper and lower openings are formed in the first hermetically sealed container 80, and the second hermetically sealed container 40 is connected to the upper opening through an insulating spacer 41. In the second hermetically sealed container 40, a bus bar-side disconnecting device 404 electrically connected to the terminal side above the vacuum circuit breaker 22 in the first hermetically sealed container is constituted. In addition, the third hermetically sealed container 210 is connected to the second hermetically sealed container 40 via an insulating spacer 213, and a main bus conductor 211 is disposed in the third hermetically sealed container 210.

The fourth hermetically sealed container 52 is connected to the opening portion of the lower portion of the first hermetically sealed container 80 via an insulating spacer 50, and the vacuum interrupter in the first hermetically sealed container 80 is connected to the fourth hermetic container 52. The disconnecting device 505 electrically connected to the terminal side lower than 22, and the ground switch 56 which ground the high voltage conductor which forms a main circuit are arrange | positioned. The cable head 30 is insulated out of the fourth sealed container 52 and connected to the cable 303. The movable electrode side of the vacuum circuit breaker 22, the movable contact side of the disconnector 505, the movable ground contact side of the ground switch 56, and the movable contact side of the bus bar disconnector 404 are provided with a link mechanism (not shown). Through the first sealed container 80, the second sealed container 44, and the fourth sealed container 52, respectively, the airtight leads to each of the manipulators disposed in the operation panel 208.

The vacuum container of the vacuum circuit breaker 22 arrange | positioned in the 1st airtight container 80 is made of opaque ceramics similarly to the case of said embodiment, and a fixed electrode and a movable electrode are arrange | positioned inside it. In the case of using a light impermeable bellows that permits the operation of the movable electrode while maintaining the degree of vacuum in the vacuum vessel during the opening and closing operation of the movable electrode, the arc light is vacuumed even if a vacuum vessel is made of transparent ceramics or glass. It may be shielded or covered to prevent leakage out of the container. By these methods, the light-shielding vacuum circuit breaker 22 is constituted. According to this structure within the vacuum chamber of the vacuum circuit breakers 22 of the light blocking during the current blocking one arc is generated, the arc light is no work to decompose the CF ₃ I in the first closed vessel 80, a stable insulating A gas insulated switchgear having performance can be provided.

In the gas insulated switchgear according to the present embodiment, the mixed insulating gas is studied to maintain the insulation performance in each sealed container while maintaining the liquefaction temperature of -20 ° C. That is, in the first hermetically sealed container 80 having the vacuum circuit breaker 22, the volumetric ratio of CF ₃ I is 65%, the global warming coefficient is smaller than SF ₆ , and the liquefaction temperature is lower than CF ₃ I. In the mixed gas, the gas pressure was set to 0.17 MPa · abs, and the second and fourth sealed containers 44 and 52 having the disconnecting device were mixed with 65% CF ₃ I by volume and 35% nitrogen gas by volume. gas in, the gas pressure was 0.15 MPa · abs, and also a third closed container 210 to 70%, the nitrogen gas to CF ₃ I in a volume ratio that a 30% gas mixture, the gas pressure is 0.15 MPa · It is abs.

As such, by changing the mixed gas ratio and gas pressure for each sealed container housing each switchgear, each arc extinguishing and insulation performance can be satisfied while maintaining the specification of the liquefaction temperature -20 ° C, and the tank strength of each sealed container can be satisfied. It becomes possible to design optimally.

In each of the above embodiments, the insulating gas is filled into the first hermetically sealed container in which the light shielding vacuum circuit breaker 22 is disposed. The mixed gas is 65% CF ₃ I by volume and 35% nitrogen gas. The gas pressure was 0.17 MPa · abs, but the gas mixed with CF ₃ I is not limited to nitrogen gas, has the same insulation performance, the global warming coefficient is smaller than SF ₆ gas, and the liquefaction temperature is lower than CF ₃ I. CO ₂ Other insulating gases such as these may be used, or nitrogen gas and mixed gas thereof. Therefore, a mixed gas at a 40% or more by volume ratio of CF ₃ I, 0.1 to 0 to the gas pressure. If it is set to 3 MPa · abs, the same effect can be achieved without increasing the gas pressure much compared with the case where no mixed gas is used.

In addition, with respect to the gas insulated switchgear of a pre-loaded product having a relatively low rated gas pressure having a rated gas pressure of about 0.2 MPa · abs, CF ₃ I is a mixed gas having a volume ratio of 40 to 65%, and the gas pressure is 0.1 to 0.3. By setting MPa · abs, a gas insulated switchgear having approximately the same performance can be obtained simply by replacing the insulating gas, and a gas insulated switchgear having a small contribution to global warming can be easily obtained.

In FIG. 3, a bus 201, a breaker 22, a line side cable 303, a bus side breaker 404, a line side breaker 505, and a breaker are placed on the gas insulated switchgear base 201. The breaker operation box 207 which accommodated the operation device 606, and the gas monitoring box 208 are provided.

On the front side of the gas insulated switchgear base 201, a gas monitoring box 208 is fixed. On this gas monitoring box 208, a circuit breaker operation box 207 containing the circuit breaker manipulator 606 is fixed. The breaker 22 is provided by the mount 220 on the gas insulated switchgear base 201 on the back side of the breaker operation box 207. The bus bar 301 is connected to one side of this breaker 22 (upper side in FIG. 3) via the bus bar side disconnector 404. The line-side cable 303 is connected to the other side (downward in FIG. 3) of the breaker 22 via the line-side disconnector 505.

The bus bar 301 described above is a bus bar container 210, a bus bar conductor 211 arranged in a direction perpendicular to the plane of Fig. 3 in the bus bar container 210, and from these bus bar conductors 211. The branch buses 212 branched in the left direction on the ground of 1 are provided. The busbar container 210 is fixed to the busbar side disconnector container 40 of the busbar side disconnector 404 via an insulating spacer 213.

The bus-side disconnector container 40 of the bus-side disconnector 404 is fixed to the breaker container 80 of the breaker 22 via an insulating spacer 41 for maintaining airtightness. The bus bar disconnector container 40 is provided with a fixed electrode 42 connected to the branch bus bar 212 and a movable electrode 43 which comes into contact with and detached from the fixed electrode 42. Three fixed electrodes 42 and movable electrodes 43 are arranged in the bus bar-side disconnector container 40 in the direction perpendicular to the page of FIG. 3.

The circuit breaker 22 described above includes a circuit breaker container 80 fixed on the mount 220 and three vacuum circuit breakers 22 disposed in the circuit breaker container 80 in a vertical direction on the surface of Fig. 3 in the vertical direction. Equipped. The vacuum circuit breaker 22 is in contact with and detached from the vacuum breaker container 23 holding the inside in a vacuum state, the fixed electrode 24 provided in the vacuum breaker container 23, and the fixed electrode 24. The movable electrode 25 is provided. The movable electrode 43 side of the bus bar side disconnector 404 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 505. The vacuum circuit breaker 22 is opened and closed by the circuit breaker manipulator 606 stored in the circuit breaker operation box 207.

The line-side disconnector 505 is connected to the breaker container 80 via the insulating spacer 50 and at the same time, the line-side disconnector container 52 fixed on the mount 51 and the movable electrode 25 in the vacuum breaker container 23. The movable electrode 53 connected to the ()) and the fixed electrode 54 which this movable electrode 53 comes out of contact with are provided. Three fixed electrodes 54 and movable electrodes 53 are arranged in the line-side disconnector container 52 in the direction perpendicular to the surface of FIG. 3. Each fixed electrode 54 is connected to the line-side cable 303 via an insulator 505 provided between the line-side disconnector container 52 and the line-side cable 303. In the line side disconnector container 52, a grounding device 56 is provided.

The line side cable 303 is connected to the cable head 30 connected to the fixed electrode 54 of the line side disconnector 505, and is drawn out downward. The measuring current transformer 31 is provided in the outer periphery of this cable 303.

The busbar container 210, the circuit breaker container 80, the busbar side disconnector container 40, and the line side disconnector container 52 form a partition space in which the inside thereof is enclosed. CF 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. In the gas mixture as the good electrical insulating properties to inhibit liquefaction of CF ₃ I, it is a mixture of carbon dioxide and so on of the low-incompressible air or nitrogen gas, or a low boiling point than CF ₃ I compressible.

Among the busbar container 210, the breaker container 80, the busbar side disconnector container 40 and the line side disconnector container 52, in particular, the busbar side disconnector container 40 and the lineside disconnector container 52, respectively. The opening and closing portion consisting of the fixed electrode 42 and the movable electrode 43 and the opening and closing portion consisting of the movable electrode 53 and the fixed electrode 54 are provided, and a grounding device 56 is provided in the line side disconnector container 52. It is. These opening and closing portions generate an arc when the electrode is detached from the atmosphere of the CF ₃ I gas and the mixed gas in each sealed container. This arc generates a cracked gas of CF ₃ I from a CF ₃ I-containing gas in a sealed container, but the cracked gas (iodine gas I ₂ , fluorine gas F ₂ ) and hydrogen iodide gas that may be purified in the sealed container. In order to adsorb the hydrogen fluoride gas and the trace water, the adsorption device 100 is provided in the busbar side disconnector vessel 40 and the line side disconnector vessel 52, respectively.

In this example, the adsorption | suction apparatus 100 installed in the bus bar side disconnector container 40 is being fixed to the inner surface of the cover 44 of the bus bar side disconnector container 40 in relation to the installation space. Moreover, the adsorption | suction apparatus 100 installed in the track side disconnector container 52 is mounted on the bottom surface of the track side disconnector container 52 in relation to the installation space.

As shown in Fig. 4 and Fig. 5, for example, the adsorption device 100 includes an adsorbent 101 such as activated carbon, a breathable bag 102 containing the adsorbent 101, It consists of the base 103 which hold | maintains this bag body 102, and the container which consists of the cylindrical body 104 fixed on the base 103 by welding etc. The air permeable bag body 102 containing the adsorbent 101 is placed in a space formed by the base 103 and the cylindrical body 104 fixed by welding or the like on the base 103. The adsorbent 101 in the bag 102 passes through each of the sealed containers via a vent hole 105 provided in the bag 102 and the cylindrical body 104.

In addition, the above-mentioned adsorption apparatus 100 provided the bolt hole 106 in the base 103 for fixing to the inner surface of the cover 44, but omits this bolt hole 106 when it mounts in a sealed container. can do.

Next, operation | movement of one Embodiment of the cubicle type gas insulated switchgear which is the gas insulated electric apparatus of above this invention is demonstrated.

In the gas insulated switchgear, when an overcurrent occurs in the line side cable 303 side, the vacuum circuit breaker 22 is blocked to prevent the overcurrent from being transmitted to the bus bar 301, and the gas insulated switchgear is repaired. At the time of inspection, the vacuum circuit breaker 22 in the circuit breaker container 80 is cut off, the bus-side disconnector 404 and the line-side disconnector 505 provided separately from the breaker 22 are opened, and a grounding device ( By grounding 56), residual charges and induction currents on the power supply side flow to the ground, preventing reapplied from the power supply side, and the worker's safety is achieved.

In the maintenance inspection of the gas insulated switchgear, the fixed electrode 42 and the movable electrode 43 of the bus-side disconnector 404 are further connected to the fixed electrode 54 and the movable electrode 53 of the line-side disconnector 505. In addition, the grounding device 56 performs contact release operation, respectively, to generate an arc in the atmosphere of the CF ₃ I-containing gas in each of the sealed containers 40 and 52.

In response to this arc generation, the CF ₃ I-containing gas exhibits arc extinguishing performance and electrical insulation performance. On the other hand, CF ₃ I-containing gas, by the arc energy comprising CF ₃ I CF ₃ I in the gas to produce iodine gas, fluorine gas as a decomposition gas.

The dissociated iodine gas and fluorine gas are 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 free of corrosive or poorly insulating materials, the bus-side disconnector 404 and the line-side disconnector 505 Arc extinguishing performance and electrical insulation performance can be maintained.

In addition, iodine gas or fluorine gas is prevented from adhering to the fixed electrode 42 and the movable electrode 43 of the bus-side disconnector 404 and the fixed electrode 54 and the movable electrode 53 of the line-side disconnector 505. Therefore, it can hold | maintain without degrading predetermined | prescribed electricity supply performance. In addition, since adhesion of cracked gases (iodine gas, fluorine gas) to the inner surfaces of the respective sealed containers 40 and 52 can be suppressed, corrosion of the inner surfaces of the respective sealed containers 40 and 52 can also be suppressed. Long life of the group is possible.

In addition, the iodine gas and the fluorine gas produced by decomposition may react with the trace moisture in the sealed container again to purify the hydrogen iodide gas or the hydrogen fluoride gas. These gases, like iodine gas and fluorine gas, are also highly corrosive, and may corrode structural members per electrode. However, as a result of adsorption removal of these by the adsorption apparatus, such a problem disappears.

As described above, according to one embodiment of the present invention, the use of CF ₃ I-containing gas as insulation gas results in low global warming coefficient, excellent arc extinguishing performance and electrical insulation performance, and decomposition gas from CF ₃ I-containing mixed gas. Adsorption of the gas can provide a gas insulated switchgear having good conduction performance. Further, a gas insulated switchgear having a size equivalent to or less than that in the case of using a conventional SF ₆ insulated gas can be provided.

Fig. 6 is a longitudinal side view showing another embodiment of a cubicle type gas insulated switchgear which is a gas insulated electric machine of the present invention. In Fig. 6, since the same reference numerals as those in Figs. 3 to 5 are the same parts, their detailed description is omitted.

In this embodiment, the moisture in the sealed container is also adsorbed. A moisture absorbing device 200 having an absorbent such as silica gel and zeolite is provided in the breaker container 80 of the breaker 22, and the bus bar disconnector container 40 is provided. ) And an adsorption device 300 including an absorbent such as silica gel and zeolite, and an adsorbent such as activated carbon.

The moisture absorption apparatus 200 is comprised similarly to the said adsorption apparatus 100, and puts a moisture absorbent in a bag body, and stores this bag body in a container. In addition, although the structure of the adsorption apparatus 300 is shown to FIG. 7 and FIG. 8, the code | symbol same as the code | symbol of FIG. 4 and FIG. 5 in these drawings is the same part.

In FIG. 7 and FIG. 8, the cylinder 304 constituting the adsorption device 300 is divided into two by the partition wall 307, and two chambers are formed. A bag body 301 containing a moisture absorbent is provided in this one room, and a bag body 102 containing an iodine adsorbent 101 shown in FIGS. 4 and 5 described above is provided in the other chamber. In the case where the particle diameters of the moisture absorbent and the iodine adsorbent are significantly different, the adsorption area can be increased by increasing the adsorption area of each of the containers housed in different containers.

According to this embodiment, similarly to the above-described embodiment, the use of CF ₃ I-containing mixed gas as the insulating gas results in low global warming coefficient, excellent arc extinguishing performance and electrical insulation performance, and CF from CF ₃ I-containing mixed gas. Adsorption of cracked gas and water of ₃ I can provide a gas insulated switchgear with good conduction performance.

In addition, iodine and fluorine decomposed from a mixed gas containing CF ₃ I may generate hydrogen iodide gas and hydrogen fluoride gas by combining with moisture in an airtight container, but these gases are adsorbent 101 of the adsorption device 100. In this case, the same effects as in the above-described embodiments can be obtained.

In addition, in the above-described embodiment, the adsorbent 101 and the absorbent are accommodated in the bag in consideration of the convenience of scattering and recovery of the adsorbent 101 and the absorbent, but the adsorbent 101 and the absorbent are not used without the bag 102. Can be directly put into the space formed by the base 303 and the cylindrical body 104 on the base 303. Moreover, without using the holding container which consists of the base 303 and the cylindrical body 304 on this base 303, the bag 102 which accommodated the adsorbent 101, and the bag 102 which accommodated the moisture absorbent It is also possible to install in a sealed container.

In the above-described embodiment, since the vacuum-closed vacuum circuit breaker 22 is provided in the circuit breaker container 80 of the circuit breaker unit, the electrode of the circuit breaker in which the high current interruption arc is generated comes into contact with the CF ₃ I-containing mixed gas. since there is no work, the sealing CF ₃ in no generation of iodine gas, sealed with a small sealed container, the earthing switch of a current cut-off disconnecting switch unit for the arc is animated at the time of a small opening and closing the barrier current by the breaker container in the container Since the I-containing mixed gas is sealed, the iodine gas as the whole gas insulated switchgear can be minimized.

As a result, the global warming potential as in the above-described embodiment is small, the arc excellent extinguishing performance and electrical insulation performance, CF ₃ I by the suction function of the CF ₃ I decomposition gas and moisture from the containing gas mixture in good also energized performance A gas insulated switchgear can be provided.

According to the present invention, an effective means for preventing insulation deterioration in a gas insulated electric apparatus using an insulation gas containing CF ₃ I, which is an insulation gas having a small warming coefficient, can be provided.

Claims (15)

In the gas insulated switchgear provided with the airtight container which sealed the insulating gas, and the vacuum circuit breaker and the disconnector which were installed in the airtight container in the state electrically insulated from the said airtight container, The vacuum breaker is a light blocking does not leak to the arc light at the time of current interruption out of the vacuum chamber, the insulating gas is lower than 40% CF ₃ I, and a liquefaction temperature than that of the CF ₃ I in a volume ratio, a global warming factor SF _A gas insulated from an insulating gas smaller than ₆ gases, wherein the gas pressure of the gas is 0.1 to 0.3 MPa · abs. The method of claim 1, The mixed gas contains 40 to 70% of CF ₃ I by volume, and the balance is another insulating gas. The method of claim 1, And said other insulating gas is at least one selected from dry air, carbon dioxide, and nitrogen. The method of claim 1, The low molecular weight gas generated by the reaction in the cracked gas and / or the sealed container contains at least one of iodine gas, fluorine gas, hydrogen iodide gas and hydrogen fluoride gas. In the gas insulated electric device comprising a switch in a sealed container, A mixed gas of CF ₃ I and another insulating gas is sealed in the sealed container, and the gas generated by decomposition of the insulating gas in the sealed container and / or a low molecular weight gas generated by reaction in the sealed container is selectively A gas insulated electric machine comprising an adsorbent for adsorbing. The method of claim 5, The adsorbent is gas insulated electrical equipment, characterized in that the activated carbon. The method of claim 5, The low molecular weight gas generated by the reaction in the cracked gas and / or the sealed container contains at least one of iodine gas, fluorine gas, hydrogen iodide gas and hydrogen fluoride gas. In the gas insulated electrical equipment containing the circuit breaker, disconnector, and grounding device in a sealed container, The breaker is a vacuum circuit breaker and disposed in the sealed container enclosed with the mixed gas containing CF ₃ I, and the disconnector and the grounding device are respectively placed in the closed container enclosed with insulating gas by the mixed gas containing CF ₃ I. And an adsorbent for adsorbing low molecular weight gas generated by decomposition of CF ₃ I and / or reaction in the sealed container in each sealed container of the disconnecting device and the grounding device. . The method of claim 8, The mixed gas contains 40 to 70% of CF ₃ I by volume, and the balance is another insulating gas. The method of claim 8, And said other insulating gas is at least one selected from dry air, carbon dioxide, and nitrogen. The method of claim 8, The gas insulated electric device is provided with a plurality of hermetically sealed containers, and each hermetically sealed container is arranged to be connected to constitute a gas insulated electric device, and the mixed gas of each hermetic container is an insulating gas different from CF ₃ I. Gas insulated electrical equipment, characterized in that the mixing ratio is different. The method of claim 11, Gas insulated electrical equipment, characterized in that the gas pressure of the insulating gas of each sealed container is different. The method of claim 8, The insulating gas is a mixed gas comprising 40% or more of CF ₃ I by volume ratio and another insulating gas having a liquefaction temperature lower than that of the CF ₃ I and a global warming coefficient lower than SF ₆ , and the gas pressure of the mixed gas is 0.1 to A gas insulated electric machine comprising 0.3 MPa · abs. The method of claim 8, The low molecular weight gas generated by the reaction in the cracked gas and / or the sealed container contains at least one of iodine gas, fluorine gas, hydrogen iodide gas and hydrogen fluoride gas. The method of claim 8, The adsorbent is gas insulated electrical equipment, characterized in that the activated carbon.

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