JP6338960B2 - Insulating spacer for gas insulated switchgear and method for manufacturing the same - Google Patents

Description

  Embodiments of the present invention relate to an insulating spacer for a gas insulated switchgear that is modeled by a three-dimensional modeling apparatus.

  At present, gas-insulated switchgear using an insulating gas such as SF6 gas as an insulating medium and a quenching medium is widely used in high voltage and large capacity power systems. In the gas insulated switchgear, an insulating spacer for insulatingly supporting the high voltage conductor is used inside the metal container. The insulating spacer for the gas-insulated switchgear also serves as a gas partitioning spacer that separates the metal containers on both sides during operation and maintenance of the gas-insulated switchgear.

  As a device constituting the gas insulated switchgear, a gas insulated bus as shown in FIG. 5 is known. Here, a cone-shaped insulating spacer 3 is employed. The insulating spacer 3 is of a cone type, thereby increasing the creeping distance and reducing the creeping electric field. In the gas insulated bus in FIG. 5, a grounded cylindrical metal container 2 is provided. Insulating gas 4 is enclosed in the metal container 2 and the energizing high-voltage conductor portion 1 is inserted. Has been.

  The outer periphery of the insulating spacer 3 is fixed to the inner wall surface of the metal container 2, and an electric field relaxation shield 5 is provided near the center. A high voltage conductor portion 1 is attached to the electric field relaxation shield 5. The high voltage conductor part 1 and the electric field relaxation shield 5 and the metal container 2 have a coaxial structure, and the ratio of the inner diameters of the high voltage conductor part 1 and the electric field relaxation shield 5 and the metal container 2 is about 1: 3. .

  In general, the electric field distribution in the vicinity of the surface of the insulating spacer 3 is determined by the geometric shapes of the high voltage conductor portion 1, the insulating spacer 3 and the electric field relaxation shield 5, and the dielectric constants of the insulating spacer 3 and the insulating gas 4. In the gas insulated switchgear, the inner diameter ratio of the high voltage conductor portion 1 and the metal container 2 is different, so that the electric field value on the surface of the insulating spacer 3 reflects this inner diameter ratio and the electric field value on the energization side near the high voltage conductor portion 1. And the electric field value on the ground tank side near the inner wall surface of the metal container 2 is low. That is, in the gas-insulated bus in FIG. 5, the ratio of the inner diameter of the high voltage conductor portion 1 and the electric field relaxation shield 5 to the metal container 2 is about 1: 3. However, it is as high as nearly three times the electric field value on the metal container 2 side (see the graph shown by the dotted line in FIG. 6).

  In general, in a gas insulated switchgear, since the maximum electric field value on the surface of the insulating spacer determines the device size and the insulating performance, it is required to reduce the maximum electric field value on the surface of the insulating spacer. Therefore, conventionally, a technique for optimizing the shape of the insulating spacer and a technique for reducing the dielectric constant of the insulating spacer have been proposed.

  For example, when manufacturing an insulating spacer, a technique has been proposed in which a plurality of insulating materials having different blending amounts of epoxy resin and filler are prepared, and the insulating spacer is heat-molded by continuously changing the proportion of the insulating material. (Patent Document 1 etc.). According to this technology, the dielectric constant of the insulating spacer is spatially inclined so that the dielectric constant is increased on the energization side near the high-voltage conductor and the dielectric constant is decreased on the ground tank side near the metal container. Is possible.

  Therefore, if the ratio of the inner diameter of the high voltage conductor part 1 and the electric field relaxation shield 5 to the metal container 2 is about 1: 3 as in the gas insulated bus in FIG. 5, the dielectric constant of the insulating spacer 3 is high voltage conductor part. The insulating spacer 3 is manufactured by spatially inclining the dielectric constant so that the ratio is about 3 to 1 between the 1 side and the metal container 2 side. Thereby, in the insulating spacer 3, only the dielectric constant in the vicinity of the high-voltage conductor portion 1 having a small inner diameter is increased, and the electric field value on the high-voltage conductor portion 1 side, that is, the maximum electric field value on the surface of the insulating spacer 3 can be suppressed. (Refer to the graph shown by the solid line in FIG. 6).

JP 2010-176969 A

  An insulating spacer for a gas insulated switchgear is manufactured by mold casting using an insulating material in which an epoxy resin is mixed with a filler such as alumina or silica. For this reason, when manufacturing complex shapes such as cone molds, high technical skills are required for mold design and casting, resulting in high manufacturing costs. In addition, when manufacturing an insulating spacer in which the ratio of a plurality of insulating materials is continuously changed by mold casting, a more sophisticated manufacturing technique is required, and an increase in manufacturing cost becomes a serious problem. Yes.

  Since the insulating spacer also plays a role as a gas partitioning spacer, it is required to withstand mechanical force due to the differential pressure of gas generated during the partitioning. However, when manufacturing insulating spacers by mold casting, it is possible to manufacture simple shapes such as having relatively large holes, but it is very difficult to manufacture high-strength structures with complicated shapes. It was difficult.

  Embodiments of the present invention have been proposed in order to solve the above-described problems. By simply shaping a structure having a dielectric constant spatially inclined, it is possible to reduce manufacturing costs and improve mechanical characteristics. An object is to provide an insulating spacer for the gas-insulated switchgear.

  In order to achieve the above object, an embodiment of the present invention is used for a gas-insulated switchgear in which an insulating gas is sealed inside a grounded metal container and a high-voltage conductor for energization is inserted. The insulating spacer for a gas-insulated switchgear that insulates and supports the high-voltage conductor portion on the metal container has the following characteristics.

(A) An insulating portion made of an insulating material and a flow path through which the insulating liquid flows are provided.
(B) The ratio of the flow path per unit volume to the insulating portion is increased from the high voltage conductor portion side toward the inner wall surface side of the metal container.

The embodiment of the present invention also includes the following aspects.
(C) It has a laminated structure manufactured from an insulating material by a three-dimensional modeling apparatus.
(D) In the laminated structure, the blending ratio of the insulating material is changed so that the dielectric constant decreases from the high voltage conductor portion side toward the inner wall surface side of the metal container.
(E) Furthermore, a flow path through which the insulating liquid flows is formed.

Sectional drawing of 1st Embodiment. The graph which showed the gradient characteristic of the dielectric constant from the high voltage conductor part side of an insulating spacer to the metal container side. Sectional drawing of 2nd Embodiment. Sectional drawing of 3rd Embodiment. Sectional drawing of gas insulation busbar vicinity of the conventional gas insulation switchgear. The graph which showed the electric field analysis result in the general insulation spacer and the insulation spacer which inclined the dielectric constant spatially.

(First embodiment)
Hereinafter, a first embodiment to which the present invention is applied will be specifically described with reference to FIGS. 1, 2, and 6. FIG. 1 is a cross-sectional view of a gas insulated bus according to the first embodiment. In the gas insulated bus in FIG. 1, the same parts as those in the conventional example shown in FIG.

(Constitution)
The insulating spacer 6 according to the first embodiment has a disk shape as a whole, the outer peripheral portion is fixed to the inner wall surface of the metal container 2, and the electric field relaxation shield 5 is provided near the center. The structural features of the insulating spacer 6 are as follows.
(A) The insulating spacer 6 has a truss structure manufactured from an insulating material by a three-dimensional modeling apparatus. The three-dimensional modeling apparatus is also called a three-dimensional layered modeling apparatus, a 3D printer, or the like, and is an apparatus that models a three-dimensional object by stacking cross-sectional shapes based on 3D data.

(B) The truss structure in the insulating spacer 6 includes an insulating portion made of an insulating material and a hollow portion into which the insulating gas 4 enters. The insulating spacer 6 increases the ratio of the hollow portion per unit volume continuously by gradually increasing the triangular opening from the high voltage conductor portion 1 side toward the inner wall surface side of the metal container 2. ing.

  That is, in the insulating spacer 6, when the ratio between the insulating portion made of the insulating material and the hollow portion into which the insulating gas 4 enters is compared, the ratio of the insulating portion is increased on the energization side near the high voltage conductor portion 1. In addition, the insulating spacer 6 is shaped so that the ratio of the hollow portion gradually increases as it approaches the inner wall portion of the metal container 2.

  In the insulating spacer 6, since the insulating portion made of an insulating material has a high dielectric constant, the dielectric constant is increased on the energization side in the vicinity of the high voltage conductor portion 1. On the other hand, in the cavity, the dielectric constant of the insulating gas 4 existing there is low. Therefore, the insulating spacer 6 has a structure in which the dielectric constant decreases as it approaches the inner wall portion of the metal container 2, as if the relative dielectric constant is continuously inclined and changed.

  Specifically, since the ratio of the inner diameters of the high voltage conductor part 1 and the electric field relaxation shield 5 to the metal container 2 is about 1: 3, the dielectric constant of the insulating spacer 6 is the high voltage conductor part 1 side and the metal container 2 side. The volume of the cavity per unit volume is continuously increased so as to be about 3 to 1. For example, as shown in the graph of FIG. 2, when the inner diameter of the metal container 2 is 300 mm and the inner diameter of the high voltage conductor portion 1 is 100 mm, if the relative dielectric constant on the inner wall surface of the metal container 2 is 4, The volume of the cavity portion is continuously changed so that the relative dielectric constant on the surface of the voltage conductor portion 1 becomes 12, which is three times that.

(C) The atmosphere in the three-dimensional modeling apparatus at the time of manufacturing the insulating spacer 6 is set to 0.2 MPa to 0.5 MPa with SF6 gas.

(Function and effect)
The operation and effects of the first embodiment having the above-described configuration are as follows.
(A) Improvement of insulation performance The insulation spacer 6 has the dielectric constant of the insulation material 4 and the dielectric constant of the insulation gas 4 by changing the ratio of the cavity per unit volume continuously. Due to the difference, the dielectric constant of the insulating spacer 6 can be spatially and continuously inclined.

  That is, the insulating spacer 6 uses the insulating gas 4 present in the cavity and adjusts the amount of the insulating gas 4 that enters the insulating spacer 6 so that the relative permittivity is continuously inclined and changed. Can be realized. As a result, the electric field of the insulating spacer 6 can be optimized, the maximum electric field value on the surface can be reduced as compared with the conventional insulating spacer, and the insulating performance is improved.

  And in this embodiment, the magnitude | size of the cavity part in the insulating spacer 6 can be controlled with high precision by modeling with a three-dimensional modeling apparatus. For this reason, it is possible to set the dielectric constant of the insulating spacer 6 finely. Therefore, in the case where the insulating spacer in which the ratio of the plurality of insulating materials is continuously changed is manufactured by the mold casting, that is, the insulating spacer 6 having the dielectric constant gradient is manufactured by the mold casting. The dielectric constant can be set more finely.

  As a result, the insulating spacer 6 can obtain a more accurate dielectric constant corresponding to the inner diameter ratio of the high voltage conductor portion 1 and the electric field relaxation shield 5 and the metal container 2. For this reason, the electric field value on the high-voltage conductor 1 side, that is, the maximum electric field value on the surface of the insulating spacer 6 can be suppressed to be lower than that of a conventional insulating spacer having a gradient of dielectric constant (shown by a thick solid line in FIG. 6). See graph). Therefore, the insulating spacer 6 can exhibit better insulating performance, and can provide a gas insulated switchgear that is more compact and has high insulating performance.

  By the way, it is necessary to prevent the generation of minute voids called voids in an insulating spacer manufactured by conventional mold casting. Therefore, although it is manufactured by vacuum casting, it is difficult to completely prevent voids from occurring and remaining in the insulating spacer. If a void is generated, it is manufactured by vacuum casting, so the inside of the void is in a vacuum state with a low atmospheric pressure. Therefore, the void becomes a weak point in insulation.

  So, in this embodiment, the atmosphere in the three-dimensional modeling apparatus at the time of manufacturing the insulating spacer 6 by the three-dimensional modeling apparatus is SF6 gas having extremely high insulation performance, and is set to 0.2 MPa to 0.5 MPa. For this reason, the void which arises at the time of modeling of the insulating spacer 6 can be made harmless, and the weak point on insulation can be overcome.

(B) Reduction of manufacturing cost Since the insulating spacer 6 does not use a mold casting, it can be easily modeled by a three-dimensional modeling apparatus even when a complicated shape is manufactured. Further, it is not necessary to use a complicated shape such as a cone shape, and the shape of the insulating spacer 6 can be simplified. Therefore, a reduction in manufacturing cost can be expected.

(C) Improvement of mechanical properties Since the insulating spacer 6 has a truss structure, it can be lightweight and have high strength, and has high mechanical properties. In addition, since a complicated shape can be easily modeled by the three-dimensional modeling apparatus, mechanical characteristics can be improved efficiently compared to an insulating spacer manufactured by conventional mold casting. Therefore, it can contribute to further downsizing of the insulating spacer 6.

(Second Embodiment)
A second embodiment to which the present invention is applied will be specifically described with reference to FIG. FIG. 3 is a cross-sectional view of a gas insulating bus according to the second embodiment. In the gas-insulated bus in FIG. 3, the same reference numerals are used for the same parts as those in the conventional example shown in FIG.

(Constitution)
The insulating spacer 9 according to the second embodiment has a disk shape as a whole, the outer peripheral portion is fixed to the inner wall surface of the metal container 2, and the electric field relaxation shield 5 is provided near the center. The structural features of the insulating spacer 9 are as follows.
(A) The insulating spacer 9 is manufactured from an insulating material by a three-dimensional modeling apparatus, and includes an insulating portion made of the insulating material and a hollow portion. Among these, the hollow portion is a flow path 12 through which the insulating liquid 10 flows.

  The overall shape of the flow path 12 is continuously provided with ring-shaped cavities having different inner diameters. The flow path 12 is set such that the inner diameter on the high voltage conductor portion 1 and the electric field relaxation shield 5 side is narrow, and the inner diameter gradually increases toward the metal container 2 side. For example, in the insulating spacer 9, when the dielectric constant is about 3 to 1 between the high voltage conductor 1 side and the metal container 2 side, the high voltage conductor 1 and the electric field relaxation shield 5 side are realized so as to realize this. The diameter of the channel 12 and the diameter of the channel 12 on the metal container 2 side are continuously changed so as to be about 3: 1.

  Also in the insulating spacer 9 according to the second embodiment, as with the insulating spacer 6, when the inner diameter of the metal container 2 is 300 mm and the inner diameter of the high-voltage conductor portion 1 is 100 mm, the dielectric constant on the inner wall surface of the metal container 2 is set. If the ratio is 4, the diameter of the flow path 12 is continuously changed so that the relative dielectric constant on the surface of the high-voltage conductor portion 1 becomes 12 that is three times that. The insulating material stacking direction by the three-dimensional modeling apparatus may be the radial direction of the insulating spacer 9 (vertical direction in FIG. 4) or the thickness direction of the insulating spacer 9 (horizontal direction in FIG. 4).

(B) A channel port 7 for flowing the insulating liquid 10 into the channel 12 is grounded at the end of the channel 12. A liquid supply unit 11 that supplies the insulating liquid 10 to the flow path 12 is connected to the flow path port 7. Further, the insulating liquid 10 may be replaced at a predetermined interval.

(Function and effect)
The second embodiment having the above configuration has the following unique actions and effects.
(A) Improvement of insulating performance Since the insulating spacer 9 continuously changes the thickness of the flow path 12, the dielectric constant of the insulating material of the insulating spacer 9 and the dielectric of the insulating liquid 10 flowing in the flow path 12 Depending on the difference from the rate, the dielectric constant of the insulating spacer 9 can be inclined and changed spatially continuously.

  That is, the insulating spacer 9 can also easily obtain a structure in which the equivalent relative permittivity is inclined between the high-voltage conductor portion 1 and the electric field relaxation shield 5 for energization and the metal container 2 that is a ground tank. The maximum electric field value on the surface of the spacer 9 can be efficiently suppressed. Thereby, the insulation performance of the insulation spacer 9 can be improved, and it can contribute to the compactness of a gas insulated switchgear and the improvement of insulation performance.

(B) Improvement of cooling performance Since the liquid supply part 11 can forcibly flow the insulating liquid 10 through the flow path 12, the high-voltage conductor part 1 and the electric field relaxation shield 5 in the vicinity of the high-voltage conductor part 1 that become high temperature for power supply. It is possible to suppress the temperature rise.

(Third embodiment)
A third embodiment to which the present invention is applied will be specifically described with reference to FIG. FIG. 4 is a cross-sectional view of a gas-insulated bus according to the third embodiment. In the gas insulated bus in FIG. 4, the same parts as those in the conventional example shown in FIG.

(Constitution)
The insulating spacer 8 according to the third embodiment has a disk shape as a whole, the outer peripheral portion is fixed to the inner wall surface of the metal container 2, and the electric field relaxation shield 5 is provided near the center. The structural features of the insulating spacer 8 are as follows.
(A) The insulating spacer 8 has a laminated structure manufactured from an insulating material by a three-dimensional modeling apparatus. In the laminated structure of the insulating spacer 8, the blending ratio of the insulating material is changed so that the dielectric constant continuously decreases from the high voltage conductor portion 1 side toward the inner wall surface side of the metal container 2.

  Also in the insulating spacer 8 according to the third embodiment, similarly to the insulating spacer 6, when the inner diameter of the metal container 2 is set to 300 mm and the inner diameter of the high voltage conductor portion 1 is set to 100 mm, the ratio on the inner wall surface of the metal container 2 is increased. If the dielectric constant is 4, the compounding ratio of the insulating material is changed so that the relative dielectric constant on the surface of the high-voltage conductor portion 1 is 12 that is three times that.

(B) The insulating material constituting the insulating spacer 8 is made of a plurality of different materials. Although FIG. 4 shows that five types of insulating materials are used for the sake of convenience, a number of different materials are actually used. As an insulating material for satisfying a desired dielectric constant ratio, for example, an insulating material having a high dielectric constant includes a material obtained by filling an epoxy resin with a high dielectric constant material such as titanium oxide as a filler.

  In addition, examples of the low dielectric constant insulating material include a material obtained by filling an epoxy resin with low dielectric constant silica as a filler. By injecting these fillers and changing the density distribution of the fillers, the gradient of the dielectric constant can be realized. In addition, the kind of insulating material which comprises the insulating spacer 8, its compounding ratio, the density of a filler, etc. can be changed suitably.

(C) The insulating material laminated in the insulating spacer 8 has the radial direction of the metal container 2 as the laminating direction.

(Function and effect)
The third embodiment having the above configuration has the following unique actions and effects.
(A) Improvement of insulating performance The insulating spacer 8 uses a plurality of different materials, and the dielectric constant is inclined spatially continuously by changing the mixing ratio of the different materials. In FIG. 4, for the sake of convenience, five types of insulating materials are used. However, since a number of different types of materials are actually used, the dielectric constant of the insulating spacer 8 changes stepwise in five steps. Rather than going, the dielectric constant is inclined spatially continuously.

  Such an insulating spacer 8 can also have a structure with an equivalent relative dielectric constant of 3: 1 on the energization side and the ground tank side of the insulating spacer 8. As a result, the maximum electric field value on the surface of the insulating spacer 8 can be efficiently suppressed. Thereby, the insulation performance of the insulating spacer 8 is greatly improved, and it can contribute to the compactness of the gas insulated switchgear and the improvement of the insulation performance.

(B) Improvement of manufacturing efficiency Since the stacking direction of the insulating material in the insulating spacer 8 is the radial direction of the metal container 2, the spatial change of the dielectric constant can be more smoothly inclined. Therefore, it is possible to increase the manufacturing efficiency and contribute to the reduction of the manufacturing cost.

(Other embodiments)
(1) The above embodiment is presented as an example in the present specification, and is not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

(2) For example, although SF6 gas was used as the insulating gas 4 enclosed in the metal container 2 in the above embodiment, other gases such as air, carbon dioxide, oxygen, nitrogen, which are naturally derived gases, and the like It is also possible to use those mixed gases.

(3) As a method of the three-dimensional modeling apparatus, a heat melting lamination method in which resin materials are injected from a nozzle and stacked to form a model, an ink jet method in which a liquid resin in a tank is hardened with ultraviolet rays, and the like are known. Which method is used can be appropriately selected.

(4) Although the truss structure is used in the first embodiment, a honeycomb structure may be used. In the second and third embodiments, the outer appearance of the insulating spacers 8 and 9 is merely a disk shape, but it may be a truss structure or a honeycomb structure.

(5) In the above embodiment, the ratio of the inner diameter of the high voltage conductor part 1 and the electric field relaxation shield 5 to the metal container 2 is about 1: 3, and the dielectric constant of the insulating spacers 6, 8, 9 is high voltage conductor part 1. The dielectric constant is spatially inclined so that the ratio is about 3 to 1 on the side and the metal container 2 side, but the ratio of the high voltage conductor 1 side and the metal container 2 side can be changed as appropriate.

(6) The hollow structure only needs to be changed so that the proportion of the hollow portion increases from the high voltage conductor portion 1 side toward the inner wall surface side of the metal container 2. The change may be multistage without changing. Moreover, also about a laminated structure, it is not necessary for a dielectric constant to become small continuously toward the inner wall surface side of the metal container 2 from the high voltage conductor part 1 side, and you may make it reduce in steps.

(6) Since the three-dimensional modeling apparatus is manufactured by laminating insulating materials, the insulating spacers 6, 8, 9 and the electric field relaxation shield 5 to be finally assembled can be manufactured in an assembled state. is there. Therefore, it is not necessary to separately manufacture and assemble the insulating spacers 6, 8, 9 and the electric field relaxation shield 5, and the assembly work can be omitted to improve the work efficiency.

DESCRIPTION OF SYMBOLS 1 ... High voltage conductor part 2 ... Metal container 3, 6, 8, 9 ... Insulating spacer 4 ... Insulating gas 5 ... Electric field relaxation shield 7 ... Channel opening 10 ... Insulating liquid 11 ... Liquid supply part 12 ... Channel

Claims (8)

An insulating gas is sealed inside a grounded metal container and used for a gas-insulated switchgear in which a high-voltage conductor for energization is inserted, and the high-voltage conductor is insulated from the metal container In insulating spacers for supporting gas insulated switchgear,
It includes an insulating portion made of insulation material, a flow path through which the insulating liquid, and
An insulating spacer for a gas-insulated switchgear, wherein a ratio of the flow path per unit volume to the insulating portion is increased from the high voltage conductor portion side toward an inner wall surface side of the metal container. An insulating gas is sealed inside a grounded metal container and used for a gas-insulated switchgear in which a high-voltage conductor for energization is inserted, and the high-voltage conductor is insulated from the metal container In insulating spacers for supporting gas insulated switchgear,
It has a laminated structure manufactured from an insulating material by a three-dimensional modeling device,
The laminated structure changes the compounding ratio of the insulating material so that the dielectric constant decreases from the high voltage conductor portion side toward the inner wall surface side of the metal container ,
An insulating spacer for a gas-insulated switchgear characterized in that a flow path through which an insulating liquid flows is formed . The insulating spacer for a gas-insulated switchgear according to claim 2 , wherein the insulating material is made of a plurality of different materials. Insulating spacer for a gas insulated switchgear according to claim 1 or 2, wherein said that connecting a liquid supply portion for supplying the insulating liquid prior SL channel. The insulating spacer for a gas insulated switchgear according to claim 2 or 3, wherein the laminated structure has a radial direction of the metal container as a laminated direction. The insulating spacer for a gas-insulated switchgear according to any one of claims 2 , 3 , and 5 , wherein the insulating spacer has a truss structure or a honeycomb structure. An insulating gas is sealed inside a grounded metal container and used for a gas-insulated switchgear in which a high-voltage conductor for energization is inserted, and the high-voltage conductor is insulated from the metal container In the manufacturing method of the insulating spacer for the gas insulated switchgear to support,
A hollow structure made of an insulating material is produced by a three-dimensional modeling device,
The hollow structure includes an insulating portion made of an insulating material and a hollow portion into which the insulating gas enters, and the ratio of the hollow portion per unit volume with respect to the insulating portion is determined from the high voltage conductor portion side to the metal. Increase toward the inner wall surface of the container,
Features and to Ruga scan insulated switchgear insulating spacer manufacturing method of a device that the atmosphere in the three-dimensional modeling apparatus, at the time of production and 0.2MPa~0.5MPa with SF6 gas.   An insulating gas is sealed inside a grounded metal container and used for a gas-insulated switchgear in which a high-voltage conductor for energization is inserted, and the high-voltage conductor is insulated from the metal container In the manufacturing method of the insulating spacer for the gas insulated switchgear to support,
A hollow structure made of an insulating material is produced by a three-dimensional modeling device,
The hollow structure includes an insulating portion made of an insulating material and a flow path into which an insulating liquid enters, and the ratio of the flow path per unit volume to the insulating portion is determined from the high voltage conductor portion side to the metal container. Increase toward the inner wall side of the
A method of manufacturing an insulating spacer for a gas-insulated switchgear, characterized in that the atmosphere in the three-dimensional modeling apparatus at the time of manufacture is set to 0.2 MPa to 0.5 MPa with SF6 gas.

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