WO2022268305A1 - Insulator, gas-insulated device, and method for manufacturing insulator - Google Patents
Insulator, gas-insulated device, and method for manufacturing insulator Download PDFInfo
- Publication number
- WO2022268305A1 WO2022268305A1 PCT/EP2021/067027 EP2021067027W WO2022268305A1 WO 2022268305 A1 WO2022268305 A1 WO 2022268305A1 EP 2021067027 W EP2021067027 W EP 2021067027W WO 2022268305 A1 WO2022268305 A1 WO 2022268305A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insulator
- insulating body
- terminal
- conductive inserts
- fixing member
- Prior art date
Links
- 239000012212 insulator Substances 0.000 title claims abstract description 117
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 8
- 238000009826 distribution Methods 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract description 7
- 239000004020 conductor Substances 0.000 description 23
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/06—Totally-enclosed installations, e.g. in metal casings
- H02G5/066—Devices for maintaining distance between conductor and enclosure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G5/00—Installations of bus-bars
- H02G5/06—Totally-enclosed installations, e.g. in metal casings
- H02G5/066—Devices for maintaining distance between conductor and enclosure
- H02G5/068—Devices for maintaining distance between conductor and enclosure being part of the junction between two enclosures
Definitions
- the present disclosure relates to the technical field of high-voltage power transmission. Specifically, the present disclosure relates to an insulator for a gas-insulated device, a gas-insulated device comprising the insulator, and a method for manufacturing the insulator.
- Gas-insulated devices such as Gas-Insulated Switchgear (GIS) and Gas-Insulated Transmission Lines (GIL), are widely used in the field of high-voltage power transmission technology.
- GIS Gas-insulated switchgear
- GIS is a compact metal-encapsulated switchgear consisting of a plurality of high-voltage functional modules such as a disconnector module and a circuit-breaker module, wherein adjacent functional modules are electrically connected to each other generally through at least one conductive insert arranged in an insulator.
- three-phase functional modules (such as a disconnector module) comprise an inner conductor structure with linear phase-position distribution, while other three-phase functional modules comprise an inner conductor structure with various types of triangular phase-position distribution.
- twisting conductors are commonly used as connecting media to realize phase-position transformation function, so as to ensure that the inner conductor structure of one functional module is adapted to that of another functional module connected thereto.
- the use of twisting conductors leads to very complicated design types of the inner conductor structure occupying more internal space of respective functional module, resulting in a larger/longer enclosure of the functional module, which is not conducive to ensure compactness of the functional module. Further, more contact points caused by conductor connections are not conducive to temperature rise.
- a twisting conductor has a complicated 3D geometry and needs to be manufactured by a casting or forging process, thus the cost of a twisting conductor is relatively higher than that of a general machining part due to design of special geometric feature and related investment of mold. Further, many kinds of variants are needed, which brings inconvenience to production and stock maintenance. Moreover, assembly jigs are required to ensure assembly positions, which is not conducive to ensure production efficiency.
- the present disclosure aims to provide an insulator with phase-position transformation function that overcomes the defects of the prior art.
- a first aspect of the present disclosure provides an insulator adapted to be arranged between functional modules of a gas-insulated device and comprising: an outer fixing member; an insulating body surrounded by the outer fixing member and having a first surface and a second surface; and a plurality of conductive inserts, each of the conductive inserts embedded in the insulating body and comprising a first terminal interface and a second terminal interface arranged respectively on the first surface and the second surface, wherein at least one of the plurality of conductive inserts has a non-revolved geometry, such that distribution of the first terminal interfaces of the plurality of conductive inserts on the first surface is different from that of the second terminal interfaces of the plurality of conductive inserts on the second surface.
- the phase-position transformation function is integrated into the insulator by arranging at least one non-revolved conductive insert in the insulating body, which can simplify the design of the inner conductor structure of respective functional module of the gas-insulated device and avoid dependence on twisting conductors, thereby simplifying the inner conductor system of the functional module, realizing compactness thereof, optimizing production efficiency and stock management, and effectively reducing the cost of the gas-insulated device.
- the first terminal interfaces form a triangular or hexagonal distribution on the first surface
- the second terminal interfaces form a linear distribution on the second surface
- the first terminal interfaces form a first triangular distribution on the first surface
- the second terminal interfaces form a second triangular distribution on the second surface, and wherein the first triangular distribution is different from the second triangular distribution with respect to the outer fixing member.
- each of the conductive inserts further comprises a third terminal interface arranged on the first surface, and wherein the third terminal interfaces form a hexagonal distribution on the first surface together with the first terminal interfaces.
- each of the conductive inserts further comprises a fourth terminal interface arranged on the second surface, and wherein the fourth terminal interfaces form a hexagonal distribution on the second surface together with the second terminal interfaces.
- the outer fixing member is a metal flange independent of the insulating body, or the outer fixing member is integrally formed with the insulating body.
- the insulator is a barrier insulator without any gas passage, or the insulator is a support insulator comprising at least one gas passage formed in the insulating body and/or formed between the insulating body and the outer fixing member.
- the insulator further comprises at least one grounding electrode embedded in the insulating body.
- each of the conductive inserts is combined with a shield embedded in the insulating body.
- each of the first terminal interfaces and/or the second terminal interfaces comprises six conductor-connecting holes evenly distributed in a circumferential direction.
- the insulating body comprises a groove arranged on the first connection surface and/or the second connection surface and adjacent to the outer fixing member for placement of a sealing ring.
- a second aspect of the present disclosure provides a gas-insulated device comprising the insulator according to the first aspect of the present disclosure.
- a third aspect of the present disclosure provides a method for manufacturing an insulator adapted to be arranged between functional modules of a gas-insulated device, comprising: providing an outer fixing member; providing an insulating body surrounded by the outer fixing member and having a first surface and a second surface; and providing a plurality of conductive inserts, each of the conductive inserts embedded in the insulating body and comprising a first terminal interface and a second terminal interface arranged respectively on the first surface and the second surface, wherein at least one of the plurality of conductive inserts has a non-revolved geometry, such that distribution of the first terminal interfaces of the plurality of conductive inserts on the first surface is different from that of the second terminal interfaces of the plurality of conductive inserts on the second surface.
- the insulator according to the present disclosure has a simple structure and is easy to manufacture, thus can be widely used in various types of gas-insulated device.
- FIG. 1 shows a schematic perspective view of a first embodiment of the insulator according to the present disclosure.
- Fig. 2 shows a sectional view taken along the section Zl-Zl shown in Fig.1.
- FIG. 3 shows another perspective view of the insulator shown in Fig.l.
- Fig. 4 shows a perspective view of a conductive insert of the insulator shown in Fig.l.
- Fig. 5 shows one of the side surfaces of the insulator shown in Fig.l.
- Fig. 6 shows the other of the side surfaces of the insulator shown in Fig.l.
- Fig. 7 shows an application of the insulator shown in Fig.l.
- Fig. 8 shows a schematic perspective view of a second embodiment of the insulator according to the present disclosure.
- Fig. 9 shows a lateral view of the insulator shown in Fig.8.
- Fig. 10 shows one of the side surfaces of the insulator shown in Fig.8.
- Fig. 11 shows the other of the side surfaces of the insulator shown in Fig.8.
- Fig. 12 shows a schematic perspective view of a third embodiment of the insulator according to the present disclosure.
- Fig. 13 shows another perspective view of the insulator shown in Fig.12.
- Fig. 14 shows one of the side surfaces of the insulator shown in Fig.12.
- Fig. 15 shows a sectional view taken along the section Z2-Z2 shown in Fig.14.
- Fig. 16 shows the other of the side surfaces of the insulator shown in Fig.12.
- FIG. 17 shows a schematic perspective view of a fourth embodiment of the insulator according to the present disclosure.
- Fig. 18 shows another perspective view of the insulator shown in Fig.17.
- Fig. 19 shows one of the side surfaces of the insulator shown in Fig.17.
- Fig. 20 shows a lateral view of the insulator shown in Fig.17.
- Fig. 21 shows the other of the side surfaces of the insulator shown in Fig.17.
- Fig. 22 shows a first application of the insulator shown in Fig.17.
- Fig. 23 shows a second application of the insulator shown in Fig.17.
- Fig. 24 shows a third application of the insulator shown in Fig.17.
- Fig. 25 shows a fourth application of the insulator shown in Fig.17.
- Fig. 26 shows a fifth application of the insulator shown in Fig.17.
- Fig. 27 shows a sixth application of the insulator shown in Fig.17.
- Fig. 28 shows a schematic perspective view of a fifth embodiment of the insulator according to the present disclosure.
- Fig. 29 shows a sectional view taken along the section Z3-Z3 shown in Fig.28.
- Fig. 30 shows another perspective view of the insulator shown in Fig.28.
- Fig. 31 shows a perspective view of a conductive insert of the insulator shown in Fig.28.
- Fig. 32 shows one of the side surfaces of the insulator shown in Fig.28.
- Fig. 33 shows the other of the side surfaces of the insulator shown in Fig.28.
- an “insulator” refers to a basin insulator arranged between two functional modules of a gas-insulated device, such as Gas-Insulated Switchgear (GIS) and Gas-Insulated Transmission Lines (GIL), and comprising at least one conductive insert, for example three conductive inserts for a three-phase gas-insulated device described in the embodiments of the present disclosure, for providing electrical connection between respective inner conductor systems of the two functional modules.
- a gas-insulated device such as Gas-Insulated Switchgear (GIS) and Gas-Insulated Transmission Lines (GIL)
- GIS Gas-Insulated Switchgear
- GIL Gas-Insulated Transmission Lines
- Figs. 1-6 show a first embodiment of the insulator according to the present disclosure.
- the insulator according to the present disclosure mainly comprises: an outer fixing member 1, an insulating body 2 surrounded by the outer fixing member 1 and having a first surface 21 and a second surface 22; and a plurality of conductive inserts 3, each of which is embedded in the insulating body 2 and comprises a first terminal interface 31 and a second terminal interface 32 arranged respectively on the first surface 21 and the second surface 22.
- a terminal interface arranged on a surface refers to a terminal interface substantially flush with, or slightly protruded or recessed from the surface for being adapted to connect a conductor.
- the insulator is a barrier insulator without any gas passage configured to provide fluidic communication between two adjacent functional modules of a gas-insulated device.
- the outer fixing member 1 is generally a round-shaped metal flange independent of the insulating body 2, and is provided with a plurality of screwing holes 11, preferably evenly distributed in a circumferential direction, for fixing the insulator to an enclosure of a functional module.
- the insulating body 2, such as an epoxy resin body, is an entire solid member casted inside the metal flange without any gas hole.
- the outer fixing member 1 is integrally formed with the insulating body 2. That is to say, the outer fixing member 1 is radially extended from the material of the insulating body 2 so as to form an outer-contour flange structure with screwing holes.
- outer fixing member 1 as well as the insulating body 2 are not limited to be round-shaped. Alternatively, the outer fixing member 1 and the insulating body 2 may have other geometric shapes, such as triangle, rectangle, hexagon, etc.
- At least one of the plurality of conductive inserts 3 has a non-revolved geometry as shown in Fig. 4, such that the distribution of the first terminal interfaces 31 of the plurality of conductive inserts 3 on the first surface 21 is different from that of the second terminal interfaces 32 of the plurality of conductive inserts 3 on the second surface 22 with respect to the outer fixing member 1 or the geometric central axis of the insulator.
- a conductive insert with a “non-revolved” geometry refers to a conductive insert in which the central axis of its first interface terminal deviates from that of its second interface terminal.
- each of the three conductive inserts is a conductive insert for a three-phase gas-insulated device.
- the three first terminal interfaces 31 form a equilateral triangular distribution on the first surface 21, and the three second terminal interfaces 32 form a linear distribution on the second surface 22.
- one of the second terminal interfaces 32 is arranged substantially in the center of the second surface 22.
- the first terminal interface 31 is electrically connected to the second terminal interface 32 so as to provide electrical connection between the inner conductor system of one functional module and that of another.
- Fig. 7 shows an application of the insulator shown in Fig.l.
- a first functional module Ml and a second functional module M2 each of which has an inner conductor system with a linear phase-position (P-A, P-B, P-C) distribution
- a third functional module M3 which has an inner conductor system with a triangular phase-position distribution, from two opposite sides.
- phase-position transformation is expediently achieved between the functional modules Ml and M3 as well as between the functional modules M2 and M3, which can avoid dependence on twisting conductors, thereby significantly simplifying the inner conductor system of each of the modules and realizing compactness thereof.
- the insulator further comprises at least one grounding electrode embedded in the insulating body 2, such as at least one spring electrodes electrically connected to the metal flange of the insulator, so as to reduce electric field intensity of local area, thereby optimizing dielectric performance of the insulator.
- each of the conductive inserts 3 is combined with a shield embedded in the insulating body 2 for playing a similar role, that is to say, three shields embedded in the insulating body 2 are configured to be respectively electrically connected to the three conductive inserts 3 so as to reduce electric field intensity of local area.
- the insulator further comprises a plurality of marks 12 formed on the outer peripheral edge of the outer fixing member 1 to indicate the positions of the first terminal interfaces 31 and/or the second terminal interfaces 32 for users from outside.
- each of the first terminal interfaces 31 and/or the second terminal interfaces 32 comprises six conductor-connecting holes 34 evenly distributed in a circumferential direction so as to improve flexibility for connecting various types of conductors or to be adapted to various types of conductor orientations.
- the insulating body 2 comprises a groove 24 arranged on the first connection surface 21 and/or the second connection surface 22 and adjacent to the outer fixing member 1 for placement of a sealing ring, so as to ensure gas tightness between the enclosures of adjacent functional modules.
- Figs. 8-11 show a second embodiment of the insulator according to the present disclosure.
- the insulator according to the second embodiment has a similar overall structure as that of the insulator according to the first embodiment, thus the features identical to those in the first embodiment will not be repeated here.
- the distinguishing feature lies in that, according to the second embodiment, the insulator is a support insulator comprising at least one gas passage formed in the insulating body 2 and/or formed between the insulating body 2 and the outer fixing member 1.
- the insulator according to the second embodiment comprises a plurality of gas holes 23 provided in the insulating body 2 and adjacent to the outer fixing member 1, and preferably evenly distributed in a circumferential direction, so as to provide fluidic communication between two adjacent functional modules of a gas-insulated device.
- the gap between the insulating body 2 and the outer fixing member 1 forms the gas passage to provide the above-mentioned fluidic communication.
- Figs. 12-16 show a third embodiment of the insulator according to the present disclosure.
- the insulator according to the third embodiment has a similar overall structure as that of the insulator according to the first embodiment, thus the features identical to those in the first embodiment will not be repeated here.
- each of the three conductive inserts 3 embedded in the insulating body 2 has a non-revolved geometry, such that the three first terminal interfaces 31 form a first equilateral triangular distribution on the first surface 21, and the three second terminal interfaces 32 form a second equilateral triangular distribution on the second surface 22, wherein the first triangular distribution is different from the second triangular distribution with respect to the outer fixing member 1 or the geometric central axis of the insulator.
- Figs. 17-21 show a fourth embodiment of the insulator according to the present disclosure.
- the insulator according to the fourth embodiment has a similar overall structure as that of the insulator according to the third embodiment, thus the features identical to those in the third embodiment will not be repeated here.
- the distinguishing feature lies in that, according to the fourth embodiment, the insulator is a support insulator comprising at least one gas passage formed in the insulating body 2 and/or formed between the insulating body 2 and the outer fixing member 1.
- the insulator according to the fourth embodiment comprises a plurality of gas holes 23 provided in the insulating body 2 and adjacent to the outer fixing member 1, and preferably evenly distributed in a circumferential direction, so as to provide fluidic communication between two adjacent functional modules of a gas-insulated device.
- Figs. 22-27 show six applications of the insulator according to the fourth embodiment.
- the first terminal interfaces of the three conductive inserts form an equilateral triangular distribution on the first surface of the insulating body 2, wherein the first terminal interface 31A of the A-phase insert forms the upper vertex of the equilateral triangle.
- the first terminal interfaces of the three conductive inserts form a equilateral triangular distribution on the first surface of the insulating body 2, wherein the first terminal interface 3 IB of the B-phase insert forms the left vertex of the equilateral triangle.
- the second terminal interface 32A of the A-phase insert arranged on the second surface of the insulating body 2 is rotated by 180° compared with the first terminal interface 31A of the A-phase insert arranged on the first surface of the insulating body 2
- the second terminal interface 32B of the B-phase insert arranged on the second surface of the insulating body 2 is rotated by -60° compared with the first terminal interface 3 IB of the B-phase insert arranged on the first surface of the insulating body 2
- the second terminal interface 32C of the C-phase insert arranged on the second surface of the insulating body 2 is rotated by 60° compared with the first terminal interface 31C of the C-phase insert arranged on the first surface of the insulating body 2.
- the second terminal interface 32A of the A-phase insert arranged on the second surface of the insulating body 2 is rotated by -60° compared with the first terminal interface 31A of the A-phase insert arranged on the first surface of the insulating body 2
- the second terminal interface 32B of the B-phase insert arranged on the second surface of the insulating body 2 is rotated by 60° compared with the first terminal interface 3 IB of the B-phase insert arranged on the first surface of the insulating body 2
- the second terminal interface 32C of the C-phase insert arranged on the second surface of the insulating body 2 is rotated by 180° compared with the first terminal interface 31C of the C-phase insert arranged on the first surface of the insulating body 2.
- the second terminal interface 32A of the A-phase insert arranged on the second surface of the insulating body 2 is rotated by 60° compared with the first terminal interface 31A of the A-phase insert arranged on the first surface of the insulating body 2
- the second terminal interface 32B of the B-phase insert arranged on the second surface of the insulating body 2 is rotated by 180° compared with the first terminal interface 3 IB of the B-phase insert arranged on the first surface of the insulating body 2
- the second terminal interface 32C of the C-phase insert arranged on the second surface of the insulating body 2 is rotated by -60° compared with the first terminal interface 31C of the C-phase insert arranged on the first surface of the insulating body 2.
- Figs. 28-33 show a fifth embodiment of the insulator according to the present disclosure.
- the insulator according to the fifth embodiment has a similar overall structure as that of the insulator according to the first embodiment, thus the features identical to those in the first embodiment will not be repeated here.
- the distinguishing feature lies in that, according to the fifth embodiment, each of the conductive inserts 3 further comprises a third terminal interface 33 arranged on the first surface 21 and electrically connected to the first terminal interface 31 and the second terminal interface 32, such that the third terminal interfaces 33 form a equilateral hexagonal distribution on the first surface 21 together with the first terminal interfaces 31, which improves adaptability of the insulator to various types of functional modules.
- the second terminal interface 32 is aligned with the third terminal interface 33, such that the third terminal interfaces 33 can be used for connecting conductors when phase-position transformation is not necessary.
- such a conductive insert 3 with three terminal interfaces may be configured to transform the phase positions into a linear distribution, wherein the first terminal interfaces form an hexagonal distribution on the first surface of the insulating body 2 together with the third terminal interfaces, and the second terminal interfaces form a linear distribution on the second surface of the insulating body 2.
- each of the conductive inserts 3 further comprises a fourth terminal interface arranged on the second surface 22, such that the fourth terminal interfaces form a hexagonal distribution on the second surface 22 together with the second terminal interfaces 32, which further improves adaptability of the insulator to various types of functional modules.
- the present disclosure further relates to a method for manufacturing an insulator adapted to be arranged between functional modules of a gas-insulated device, comprising the steps of: providing said outer fixing member 1; providing said insulating body 2; and providing said plurality of conductive inserts 3.
- an outer fixing member 1 made of metal and a plurality of conductive inserts 3 are firstly provided and placed into a mould, then liquid of epoxy resin is injected into the mould to form an insulating body 2, and finally the insulator is obtained after being cured and demoulded.
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2021/067027 WO2022268305A1 (en) | 2021-06-22 | 2021-06-22 | Insulator, gas-insulated device, and method for manufacturing insulator |
EP21736575.8A EP4360176A1 (en) | 2021-06-22 | 2021-06-22 | Insulator, gas-insulated device, and method for manufacturing insulator |
CN202180099115.9A CN117501568A (en) | 2021-06-22 | 2021-06-22 | Insulator, gas-insulated device, and method for manufacturing insulator |
KR1020237044423A KR20240011183A (en) | 2021-06-22 | 2021-06-22 | Insulators, gas-insulated devices and methods of manufacturing insulators |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2021/067027 WO2022268305A1 (en) | 2021-06-22 | 2021-06-22 | Insulator, gas-insulated device, and method for manufacturing insulator |
Publications (1)
Publication Number | Publication Date |
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WO2022268305A1 true WO2022268305A1 (en) | 2022-12-29 |
Family
ID=76730551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/067027 WO2022268305A1 (en) | 2021-06-22 | 2021-06-22 | Insulator, gas-insulated device, and method for manufacturing insulator |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4360176A1 (en) |
KR (1) | KR20240011183A (en) |
CN (1) | CN117501568A (en) |
WO (1) | WO2022268305A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61227622A (en) * | 1985-04-01 | 1986-10-09 | 三菱電機株式会社 | Three-phase insulation space for gas insulated switchgear |
JPH0739210U (en) * | 1993-12-25 | 1995-07-14 | 日新電機株式会社 | Gas insulated switchgear |
JP2019165534A (en) * | 2018-03-19 | 2019-09-26 | 富士電機株式会社 | Distribution panel |
-
2021
- 2021-06-22 CN CN202180099115.9A patent/CN117501568A/en active Pending
- 2021-06-22 WO PCT/EP2021/067027 patent/WO2022268305A1/en active Application Filing
- 2021-06-22 EP EP21736575.8A patent/EP4360176A1/en active Pending
- 2021-06-22 KR KR1020237044423A patent/KR20240011183A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61227622A (en) * | 1985-04-01 | 1986-10-09 | 三菱電機株式会社 | Three-phase insulation space for gas insulated switchgear |
JPH0739210U (en) * | 1993-12-25 | 1995-07-14 | 日新電機株式会社 | Gas insulated switchgear |
JP2019165534A (en) * | 2018-03-19 | 2019-09-26 | 富士電機株式会社 | Distribution panel |
Also Published As
Publication number | Publication date |
---|---|
KR20240011183A (en) | 2024-01-25 |
EP4360176A1 (en) | 2024-05-01 |
CN117501568A (en) | 2024-02-02 |
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