Insulated Switchgear

Abstract

The insulating switchgear (100) has conductor parts (7A, 7B, 7C, 8) constituting a main circuit having switches (4A, 4B, 4C, 5) and arranged inside a conductive sealed container (10, 11), and the sealed container (10, 11) is configured such that an insulating member (20) is provided on the inner wall side of a first region (R1) set in a wall portion in a discharge direction of an arc that is generated inside the sealed container (10, 11) and discharges from the conductor parts (7A, 7B, 7C, 8) toward a wall portion constituting the sealed container (10, 11), and the arc is guided to a second region (R2) of the wall portion where the insulating member (20) is not provided.

Description

[Technical Field]

[0001] The present disclosure relates to an insulating switchgear. [Background technology]

[0002] An insulated switchgear is composed of switches such as circuit breakers, disconnecting switches, and earthing switches in a main circuit section to which high voltage is applied, an operating mechanism section for driving the switches, and a control circuit section. In particular, the main circuit section of a gas-insulated switchgear is placed in a sealed container in which insulating gas with high insulating performance is pressurized and sealed, and by increasing the pressure of the insulating gas, the insulating performance is improved and the size of the entire gas-insulated switchgear is made smaller (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4193099 Summary of the Invention [Problem to be solved by the invention]

[0004] SF6 gas, which has high insulating properties, is generally used as the insulating gas, but because SF6 gas has a high global warming potential, gas-insulated switchgear that uses pressurized, sealed dry air, which has no environmental impact, has also been commercialized in recent years. If a short circuit occurs inside the above-mentioned conventional insulated switchgear, an arc may occur inside the sealed vessel, and the heat of the arc may cause a burn-through event, in which a hole is created in the sealed vessel. Because the effects of a high-temperature arc may extend to the outside of the sealed vessel, the standards for sealed vessels also require verification of internal arc occurrence events. One way to prevent burn-through is to increase the thickness of the sealed container. However, if the sealed container is made of a material with a low melting point, such as aluminum, the aluminum will melt easily due to the arc, so the sealed container must be made of a material with a high melting point, such as iron or stainless steel. However, because iron and stainless steel are heavier than aluminum, increasing the thickness of the sealed container poses the problem of increasing the weight of the entire product.

[0005] The present disclosure discloses a technique for solving the above-described problems, and aims to provide an insulated switchgear that is lightweight and ensures reliability even when an internal arc occurs. [Means for solving the problem]

[0006] The insulating switchgear of the present disclosure comprises: An insulating switchgear in which a conductor portion constituting a main circuit having a switch is disposed in a conductive sealed container, The sealed container is configured such that an insulating member is provided on the inner wall side of a first region set in the wall in a discharge direction of an arc that occurs inside the sealed container and discharges from the conductor portion toward a wall portion that constitutes the sealed container, and the arc is guided to a second region of the wall where the insulating member is not provided. 、 the second region is provided closer to the center than the periphery of the first region, and a conductive high-melting-point member having a melting point higher than the melting point of the wall portion is disposed on an inner wall side of the second region closer to the center than the periphery of the first region. It is something. [Effects of the Invention]

[0007] According to the insulated switchgear of the present disclosure, it is possible to obtain an insulated switchgear that is lightweight and yet ensures reliability even when an internal arc occurs. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front cross-sectional schematic view showing an example of the configuration of a gas-insulated switchgear according to a first embodiment. [Figure 2] 1 is a cross-sectional view schematically illustrating an internal configuration of a gas-insulated switchgear according to a first embodiment, as viewed from the side. [Figure 3] FIG. 10 is a schematic cross-sectional view showing the internal configuration of the disconnector sealed container of the comparative example as viewed from the side, showing an arc generated in the disconnector sealed container. [Figure 4] FIG. 10 is a schematic cross-sectional view showing the internal configuration of the disconnector sealed container of the comparative example as viewed from the rear side, showing an arc generated within the disconnector sealed container. [Figure 5] FIG. 10 is a schematic cross-sectional view showing the internal configuration of a sealed container for a disconnector of a comparative example, as viewed from the side, illustrating the occurrence of burn-through due to arcing. [Figure 6] FIG. 10 is a schematic cross-sectional view showing the internal configuration of a sealed container for a disconnector according to a comparative example, as viewed from the rear side, illustrating the occurrence of burn-through due to arcing. [Figure 7] 2 is a schematic cross-sectional view showing the internal configuration of the disconnector sealed container of the gas-insulated switchgear of the first embodiment as viewed from the side, showing an arc generated in the disconnector sealed container. FIG. [Figure 8] 1 is a cross-sectional schematic view showing an example of an internal configuration of a sealed container for a disconnector of a gas-insulated switchgear according to Embodiment 1, as viewed from the side. [Figure 9] 2 is a schematic cross-sectional view showing an example of the internal configuration of the disconnector sealed container of the gas-insulated switchgear according to the first embodiment, as viewed from the side, showing an arc generated in the disconnector sealed container. FIG. [Figure 10] 2 is a schematic cross-sectional view showing an example of the internal configuration of the disconnector sealed container of the gas-insulated switchgear according to Embodiment 1 as viewed from the rear side, showing an arc generated in the disconnector sealed container. FIG. [Figure 11] 1 is a schematic cross-sectional view showing an example of an internal configuration of a gas-insulated switchgear according to a first embodiment, as viewed from the side. [Figure 12] FIG. 10 is a schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear of a comparative example, as viewed from the side, illustrating an arc generated in a cable compartment. [Figure 13] FIG. 10 is a schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear of a comparative example, as viewed from the side, illustrating the occurrence of burn-through due to arcing. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 FIG. 1 is a schematic front cross-sectional view showing an example of the configuration of a gas-insulated switchgear 100 according to a first embodiment. The gas-insulated switchgear 100 as an insulating switchgear of this embodiment is installed in a power plant or the like, and is a switchgear in which a circuit breaker, a disconnecting switch, and an electric circuit connecting these are housed in a sealed container filled with insulating gas. The left-right direction of the gas-insulated switchgear 100 shown in FIG.

[0010] As shown in FIG. 1, the gas-insulated switchgear 100 includes a switchgear sealed container 10 as a first sealed container made of metal and grounded, and a cable compartment 11 as a second sealed container made of metal and grounded, as conductive sealed containers.

[0011] The sealed container for switchgear 10 is a combination of sealed containers for disconnecting switches 2A, 2B, and 2C and a sealed container for circuit breaker 3, and each sealed container houses a main circuit equipped with switches such as disconnecting switch earthing switches 4A, 4B, and 4C, and circuit breaker 5. The main circuit of each switch is connected to a bus bar 8 serving as a conductor portion. In the following description, the connection lines connected to the bus bar 8 and each switch may be collectively referred to as a conductor portion.

[0012] 1 shows the configuration of the main circuit having each switch as a single line diagram, but in reality, a three-phase main circuit is arranged. The main circuit inside the switchgear sealed container 10 is insulated by pressurizing and sealing an insulating gas such as SF6 gas or dry air, which has high insulating performance, inside the switchgear sealed container 10.

[0013] The cable compartment 11 includes cable compartments 11A, 11B, and 11C, each of which is an independent sealed container. The cable compartments 11A, 11B, and 11C accommodate cables 7A, 7B, and 7C as conductors constituting the main circuit, which extend from the disconnector sealed containers 2A, 2B, and 2C, respectively.

[0014] In the following explanation, when it is not necessary to distinguish between the sealed containers for disconnectors 2A, 2B, 2C, the disconnector earthing switches 4A, 4B, 4C, and the cables 7A, 7B, 7C, they will be referred to as the sealed container for disconnectors 2, the disconnector earthing switches 4, and the cables 7.

[0015] The cable compartments 11A, 11B, and 11C are covered with a metal housing 12 at locations corresponding to the ranges in which the cables 7 are arranged. A ground layer 7G is formed on the surface of the cable 7. An electrically insulating layer such as insulating rubber is formed inside this ground layer 7G, which insulates the high-voltage core wire inside the cable 7 from the surface ground layer 7G. Therefore, within the cable compartment 11, there is no need to consider electrical insulation between the metal housing 12 and the cable 7, or between the individual cables 7, and the cables 7 can be arranged close to the metal housing 12 or close to each other.

[0016] Unlike the sealed container 10 for the switchgear, which seals pressurized insulating gas inside, the cable compartment 11, which does not seal pressurized insulating gas, is at atmospheric pressure. For this reason, a thin metal plate is used for the cable compartment 11.

[0017] Bushings 6A, 6B, and 6C are provided at the connection between the switchgear enclosure 10 and the cable compartment 11, where cables 7A, 7B, and 7C connected to the main circuits extend, respectively. Each bushing 6A, 6B, 6C has a metal conductor disposed in the center of insulating resin, thereby hermetically sealing the insulating gas inside the sealed container 10 for the switchgear, and enabling the cable 7, which is the high-voltage main circuit conductor, to be pulled out while maintaining insulation between the grounded metal sealed container 10 for the switchgear and the cable 7. In the following description, when there is no need to distinguish between the bushings 6A, 6B, and 6C, they will be referred to as bushing 6.

[0018] In this way, the gas-insulated switchgear 100 supplies the power received through the cable 7A to the disconnector earthing switch 4A and the circuit breaker 5, which serve as the feeder panel, to be branched inside the disconnector sealed containers 2B and 2C, and outputs the power to the cables 7B and 7C, respectively.

[0019] FIG. 2 is a schematic cross-sectional view showing an example of the internal configuration of the disconnector sealed container 2 of the gas-insulated switchgear 100 according to the first embodiment, as viewed from the side. For simplicity of illustration, the cable compartment 11 is omitted. As shown in FIG. 2, an insulating plate 20 is disposed as an insulating member on the inner wall side of a first region R1 in which the wall portion constituting the disconnector sealed container 2 is set.

[0020] Hereinafter, the first region R1 of the disconnector sealed container 2 in which the insulating plate 20 is arranged in this manner will be described using a comparative disconnector sealed container 2REF that is different from the disconnector sealed container 2 of this embodiment.

[0021] FIG. 3 is a schematic cross-sectional view showing the internal configuration of the gas-insulated switchgear 100REF1 of the comparative example as viewed from the side, showing an arc Arc generated in the disconnector sealed container 2REF. FIG. 4 is a schematic cross-sectional view showing the internal configuration of the gas-insulated switchgear 100REF1 of the comparative example as viewed from the rear side, showing an arc Arc generated in the disconnector sealed container 2REF. FIG. 5 is a schematic cross-sectional view showing the internal configuration of the gas-insulated switchgear 100REF1 of the comparative example as viewed from the side, illustrating the occurrence of burn-through B due to an arc. FIG. 6 is a schematic cross-sectional view showing the internal configuration of the gas-insulated switchgear 100REF1 of the comparative example as viewed from the rear side, illustrating the occurrence of burn-through B due to an arc. The schematic diagram of the disconnector sealed container 2REF as seen from the rear side is not a single-line diagram but shows a diagram in which a three-phase main circuit is arranged.

[0022] When an arc occurs inside the disconnector sealed container 2REF due to a short circuit or other event, the electromagnetic force of the current flowing through the conductors that make up the main circuit moves the arc to the position shown in Figures 3 and 4. Then, as shown in Figures 5 and 6, the arc is extended by the electromagnetic force E, causing a ground fault on the wall that makes up the disconnector sealed container 2REF, and when the metal at the ground-faulted location melts, burn-through B occurs. As a result, a hole is made in the wall of the disconnector sealed container 2REF of the comparative example.

[0023] Therefore, in this embodiment, the approximate discharge direction of the arc Arc, which is caused to cause a ground fault from the conductor part toward the wall part of the disconnector sealed container 2 due to the electromagnetic force of the current flowing through the conductor part constituting the main circuit part, is estimated, and a first region R1 is set in advance in the wall part of the disconnector sealed container 2 on the side of the estimated discharge direction of the arc. 2, the disconnector sealed container 2 of the gas-insulated switchgear 100 of this embodiment has an insulating plate 20 disposed on the inner wall side of the set first region R1. That is, the insulating plate 20 is disposed in the wall region of the disconnector sealed container 2 where an arc discharged from a conductor portion may fall to the ground.

[0024] FIG. 7 is a schematic cross-sectional view showing the internal configuration of the disconnector sealed container 2 of the gas-insulated switchgear 100 according to the first embodiment, as viewed from the side, illustrating an arc Arc generated within the disconnector sealed container 2. 7, in the gas-insulated switchgear 100 of this embodiment, the arc cannot cause a ground fault at the insulating plate 20, so the insulating plate 20 is not provided, and the arc is guided to the second region R2 in the lower wall of the metal disconnector sealed container 2, where a ground fault can occur, and then causes a ground fault. In this configuration, the second region R2 is farther from the location where the arc occurs than the first region R1, so it takes time for the arc to extend, shortening the time that the lower surface of the disconnector sealed container 2 is exposed to arc heat, and burn-through can be suppressed if the time is short.

[0025] Here, the time obtained by subtracting the propagation time t1, which is the time it takes for the arc Arc to propagate from the conductor portion to the second region R2 of the wall portion, from the set first time T is defined as time t2. This first time T is the maximum time for which an internal arc occurs based on, for example, customer requirements, specifications, etc., and the sealed container and other components constituting the gas-insulated switchgear 100 are configured to withstand even if an arc occurs over this first time T. Therefore, the time t2 obtained by subtracting the progression time t1 from the first time T corresponds to the maximum contact discharge time during which the arc is in contact with the second region R2 of the wall portion. Therefore, the shape of the first region R1 where the insulating plate 20 is provided may be adjusted so as to lengthen the arc propagation time t1, that is, to reduce the ratio of time t2, which is the contact discharge time at the wall of the arc, to the set first time T. By providing an insulating plate 20 whose shape is adjusted in this way, it is possible to obtain a reliable effect of suppressing burn-through.

[0026] The insulating plate 20 is made of a material such as phenol resin or glass epoxy. The estimation of the arc discharge direction and the corresponding setting of the first region R1 may be estimated and set in advance by simulation or the like, including information such as circuit information indicating the direction of current flow through the conductor portion, shape information of the sealed container 2 for the disconnector itself, and position information indicating the positional relationship between the wall portion constituting the sealed container 2 for the disconnector and the conductor portion.

[0027] A disconnector sealed container 2A having a different configuration from that shown in FIG. 2 will be described below. FIG. 8 is a schematic cross-sectional view showing an example of the internal configuration of the disconnector sealed container 2A of the gas-insulated switchgear 100A according to the first embodiment, as viewed from the side. FIG. 9 is a schematic cross-sectional view showing an example of the internal configuration of the disconnector sealed container 2A of the gas-insulated switchgear 100A according to embodiment 1, as viewed from the side, showing an arc Arc generated within the disconnector sealed container 2A. FIG. 10 is a schematic cross-sectional view showing an example of the internal configuration of the disconnector sealed container 2A of the gas-insulated switchgear 100A according to embodiment 1, as viewed from the rear side, showing an arc Arc generated within the disconnector sealed container 2A.

[0028] 8 to 10, the second region R2 for guiding the arc is set closer to the center than the periphery of the first region R1 in a plane perpendicular to the Z direction, which is the thickness direction of the wall. That is, a second region R2 in which the insulating plate 20 is not placed is intentionally set inside the first region R1 where the insulating plate 20 is placed, and this portion is set as a location where the arc can cause a ground fault. Then, a high-melting-point metal material 21 is placed on the inner wall side of the wall of the second region R2 as a conductive high-melting-point member having a melting point higher than that of the wall.

[0029] With this configuration, as shown in Figures 9 and 10, the arc Arc is grounded to the portion of the high-melting-point metal material 21 arranged in the second region R2, but since the metal in that portion is a high-melting-point material, a structure can be achieved in which burn-through does not easily occur. The high melting point metal material may be stainless steel, iron, tungsten, or the like.

[0030] The above has described configuration examples of the gas insulated switchgear 100 and the gas insulated switchgear 100A in which the insulating plate 20 is provided inside the sealed switchgear container 10 in which the switch is disposed. In the following, a configuration in which a first region R1 is defined and an insulating plate 20 is provided in a cable compartment 11B in which the cable 7 is housed will be described. FIG. 11 is a schematic cross-sectional view showing an example of the internal configuration of the gas-insulated switchgear 100B according to the first embodiment as viewed from the side.

[0031] As described above, since the ground layer 7G is formed on the surface of the cable 7, it is not necessary to consider electrical insulation between the wall of the cable compartment 11B and the cable 7, or between the individual cables 7 within the cable compartment 11B. This makes it possible to arrange the cables 7 close to the wall of the cable compartment 11B, or to arrange the cables 7 close to each other. Therefore, as shown in FIG. 11, the distance between the upper wall of the cable compartment 11B and the cable 7 is also short.

[0032] In the gas-insulated switchgear 100B, a first region R1 is defined in the upper wall of the cable compartment 11B adjacent to the cable 7 and in the wall on the left side in FIG. 11, and an insulating plate 20 is provided therein. In this configuration, the second region R2 that guides the arc Arc is set at a location that is closer to the center than the periphery of the region formed by the upper first region R1 and the left first region R1.

[0033] The effect of the gas-insulated switchgear 100B having such a configuration will be described using a gas-insulated switchgear 100REF2 in which the insulating plate 20 is not arranged in the cable compartment 11. FIG. 12 is a schematic cross-sectional view showing the internal configuration of the gas-insulated switchgear 100REF2 of the comparative example as viewed from the side, showing an arc Arc generated in the cable compartment 11REF2. FIG. 13 is a schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear 100REF2 of the comparative example as viewed from the side, illustrating the occurrence of burn-through B due to an arc.

[0034] In the cable compartment 11REF2, the distance between the upper wall and the cable 7 is short. Therefore, if a short circuit occurs in the cable 7 due to a malfunction of the cable 7 as shown in FIG. 12, an arc Arc will cause a ground fault to the metal housing 12 that forms the upper wall of the nearby cable compartment 11, causing a burn-through B, as shown in FIG. 13.

[0035] 11, a gas-insulated switchgear 100B according to the present embodiment has an insulating plate 20 disposed in a portion of the metal casing 12 adjacent to the cable 7 inside the cable compartment 11B to prevent a ground fault from occurring due to the arc, and further has a high-melting-point metal material 21 disposed in a second region R2 provided in the direction in which the arc is induced and extends. This causes the arc to be induced to a ground fault at the high-melting-point metal material 21, and the high-melting-point metal material 21 suppresses burn-through in the cable compartment 11B.

[0036] Although the burn-through suppression configuration in which the high-melting-point metal material 21 is provided inside the first region R1 in the cable compartment 11 has been described above, the present invention is not limited to this. A burn-through suppression configuration without the high-melting-point metal material 21, as shown in FIG. 2, may also be provided in the cable compartment 11. Furthermore, even in such a configuration in which the high-melting-point metal material 21 is provided at the center of the insulating plate 20, the shape of the insulating plate 20 may be adjusted so that the ratio of the time t2, which is the contact discharge time of the arc, to the first time T is small. In other words, even if the arc is not induced to the high-melting-point metal material 21 at the center of the insulating plate 20 and the arc forms a ground fault outside the insulating plate 20, a configuration may be ensured in which the progression time t1 of the arc is long.

[0037] The insulating switchgear of this embodiment configured as described above has the following features: An insulating switchgear in which a conductor portion constituting a main circuit having a switch is disposed in a conductive sealed container, The sealed container is configured such that an insulating member is provided on the inner wall side of a first region set in the wall portion in a discharge direction of an arc that occurs within the sealed container and discharges from the conductor portion toward a wall portion that constitutes the sealed container, and the arc is guided to a second region of the wall portion where the insulating member is not provided. It is something.

[0038] By setting the first region in the wall portion in the arc discharge direction in this way, burn-through due to arc can be suppressed using a lightweight insulating plate. This eliminates the need to increase the plate thickness in a wide area or use high-melting-point, high-mass materials such as stainless steel or iron in a wide area, and limits the location where the arc can cause a ground fault in the sealed container. Therefore, burn-through can be prevented simply by adding insulating plate components in a limited area, without significantly changing the structure, plate thickness, or material of the sealed container of the insulated switchgear. This makes it possible to obtain a highly reliable insulated switchgear without significantly increasing product weight or cost. Burn-through of the sealed container can also be suppressed by using aluminum castings with a low melting point for the sealed container.

[0039] In the insulating switchgear of this embodiment configured as described above, the second region is provided closer to the center than the periphery of the first region, and a conductive high-melting-point member having a melting point higher than the melting point of the wall portion is disposed on an inner wall side of the second region closer to the center than the periphery of the first region. It is something.

[0040] In this way, a second area where no insulating plate is arranged is intentionally provided inside the first area provided on the wall in the direction of arc discharge, and the arc is guided to this area, and then a conductive high-melting-point material with a melting point higher than that of the wall is arranged on the inner wall side of the wall of this second area. This makes it possible to guide the arc to a location where burn-through will not occur, ensuring the reliability of the insulated switchgear.

[0041] In the insulating switchgear of this embodiment configured as described above, When the time t2 is the time obtained by subtracting the propagation time t1, which is the time it takes for the arc to propagate from the conductor portion to the second region, from the set first time T, The shape of the first region is adjusted so that the ratio of the time t2 to the first time T is small. It is something.

[0042] This can improve the effect of suppressing burn-through.

[0043] In the insulating switchgear of this embodiment configured as described above, A plurality of the sealed containers are provided, a first sealed container as the sealed container in which the switch is disposed, and a second sealed container as the sealed container in which the conductor portion extending from the first sealed container is housed, the insulating member is provided in the first region set in at least one of the first sealed container and the second sealed container; It is something.

[0044] In this way, the first region in which the insulating plate is arranged may be provided on either the side of the first sealed container in which the switch is housed and in which insulating gas is sealed, or the side of the second sealed container in which the cable is housed and in which insulating gas is sealed.

[0045] In the insulating switchgear of this embodiment configured as described above, a ground layer is formed on the outer periphery of the conductor portion via an electrical insulating layer; At least one of the position and the shape of the first region in the wall portion within the sealed container is derived based on the discharge direction of the arc based on structural information of the sealed container and structural information of the conductor portion. It is something.

[0046] In this way, the first region in which the insulating plate is disposed is set in advance, including structural information such as circuit information indicating the direction of current flow through the conductor portion, shape information of the sealed container itself, and positional information indicating the positional relationship between the wall portion constituting the sealed container and the conductor portion. This makes it possible to set the first set area based on structural information such as the proximity of the wall portion constituting the sealed container to the conductor portion, thereby making it possible to provide a highly reliable insulated switching device.

[0047] Although the present disclosure describes exemplary embodiments, the various features, aspects, and functions described in the embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed in this specification, including, for example, modifying, adding, or omitting at least one component. [Explanation of symbols]

[0048] 2A, 2B, 2C sealed container for disconnecting switch (sealed container), 3 sealed container for circuit breaker (sealed container), 4C, 4B, 4A disconnecting switch earthing switch (switch), 5 circuit breaker (switch), 7A, 7B, 7C cable (conductor part), 7G earthing layer, 8 bus bar (conductor part), 10 sealed container for switch (first sealed container), 11 cable compartment (second sealed container), 20 insulating plate (insulating member), 21 refractory metal material (refractory material), 100, 100A, 100B gas insulated switchgear (insulating switchgear).

Claims

1. An insulating switchgear in which a conductor portion constituting a main circuit having a switch is disposed in a conductive sealed container, the sealed container is configured such that an insulating member is provided on an inner wall side of a first region set in a wall portion in a discharge direction of an arc that is generated within the sealed container and discharges from the conductor portion toward a wall portion that constitutes the sealed container, and the arc is guided to a second region of the wall portion where the insulating member is not provided, the second region is provided closer to the center than the periphery of the first region, and a conductive high-melting-point member having a melting point higher than the melting point of the wall portion is disposed on an inner wall side of the second region closer to the center than the periphery of the first region. Insulated switchgear.

2. When a time t2 is defined as a time obtained by subtracting a propagation time t1, which is a time required for the arc to propagate from the conductor portion to the second region, from a set first time T, The shape of the first region is adjusted so that the ratio of the time t2 to the first time T is small. The insulating switchgear according to claim 1 .

3. A plurality of the sealed containers are provided, a first sealed container as the sealed container in which the switch is disposed, and a second sealed container as the sealed container in which the conductor portion extending from the first sealed container is housed, the insulating member is provided in the first region set in at least one of the first sealed container and the second sealed container; The insulating switchgear according to claim 1 .

4. A plurality of the sealed containers are provided, a first sealed container as the sealed container in which the switch is disposed, and a second sealed container as the sealed container in which the conductor portion extending from the first sealed container is housed, the insulating member is provided in the first region set in at least one of the first sealed container and the second sealed container; The insulating switchgear according to claim 2.

5. a ground layer is formed on the outer periphery of the conductor portion via an electrical insulating layer; At least one of the position and the shape of the first region in the wall portion of the sealed container is Derived based on the discharge direction of the arc based on structural information of the sealed container and structural information of the conductor portion. The insulating switchgear according to any one of claims 1 to 4.

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