WO2021176687A1 - ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法 - Google Patents

ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法 Download PDF

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Publication number
WO2021176687A1
WO2021176687A1 PCT/JP2020/009689 JP2020009689W WO2021176687A1 WO 2021176687 A1 WO2021176687 A1 WO 2021176687A1 JP 2020009689 W JP2020009689 W JP 2020009689W WO 2021176687 A1 WO2021176687 A1 WO 2021176687A1
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WO
WIPO (PCT)
Prior art keywords
grounding
gas
charging terminal
power charging
insulated switchgear
Prior art date
Application number
PCT/JP2020/009689
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
輝明 江波戸
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to GB2208527.8A priority Critical patent/GB2606290B/en
Priority to JP2022504914A priority patent/JP7254241B2/ja
Priority to CN202080097566.4A priority patent/CN115152110B/zh
Priority to PCT/JP2020/009689 priority patent/WO2021176687A1/ja
Publication of WO2021176687A1 publication Critical patent/WO2021176687A1/ja

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/16—Earthing arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/065—Means for detecting or reacting to mechanical or electrical defects
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/075—Earthing arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear

Definitions

  • This application relates to a cable withstand voltage test method for a gas-insulated switchgear and a gas-insulated switchgear.
  • a gas-insulated switchgear is provided with a power charging terminal for a withstand voltage test or the like (see, for example, Patent Document 1).
  • the power charging terminal provided on the gas-insulated switch is always used as a ground terminal, and at the time of the withstand voltage test, the insulating gas is sealed in the gas sealing chamber formed in the bushing, and this power charging terminal is used.
  • a test bushing is attached so as to cover the above.
  • Patent Document 2 describes a grounding switch and the ground in a gas-insulated switch in which a grounding switch is housed in a tank and a grounding circuit led out from the grounding switch to the ground is led out to the outside of the tank. A disconnecting portion connected between them is provided so that a test terminal can be connected to a terminal provided on the grounding switch side of the disconnecting portion. By the operation of opening and closing the disconnector, the terminals for the test can be easily connected, and the test can be easily carried out.
  • Patent Document 2 the three-phase blade of the disconnector moves upward and is opened by rotating around the rotation shaft, but the rotation shaft remains near the terminal, so that the insulation distance is increased during the withstand voltage test. There is a risk of inadequacy.
  • the present application discloses a technique for solving the above-mentioned problems, and an object of the present application is to provide a gas-insulated switchgear in which test terminals can be connected with a simple structure and an insulation distance can be secured. ..
  • the gas-insulated switch includes a circuit breaker and a circuit breaker with a grounding switch housed inside the tank, and a circuit breaker with a grounding switch connected to the circuit breaker with a grounding switch to ground the circuit breaker with a grounding switch.
  • a gas-insulated switch provided with a power charging terminal, one end of the circuit breaker is connected to a cable outside the tank so that it can be electrically connected, and one end is used as a rotation shaft. It has a grounding bar that is horizontally inserted and connected to the power charging terminal, and grounds the power charging terminal via a grounding conductor connected to the rotation shaft side of the grounding bar. ..
  • the cable withstand voltage test method for a gas-insulated switch is the cable withstand voltage test method for the gas-insulated switch described above, wherein the disconnector with a grounding switch is connected to the power charging terminal and grounded.
  • FIG. 2A is a diagram showing a state in which the door of the terminal chamber is opened.
  • FIG. 2B is a diagram showing a state in which the ground bar is open. It is a figure which shows the connection state of the power charging terminal of the gas insulation switchgear which concerns on Embodiment 1, and the ground bar, and is the cross-sectional view seen from the direction BB in FIG. 2A.
  • FIG. 2A is a view seen from the CC direction in FIG. 2A, showing the structure of the interlock device.
  • FIG. 5A is a view seen from the EE direction in FIG. 5A.
  • FIG. 2C is a view seen from the DD direction in FIG. 2C and shows the structure of the interlock device. It is a figure for demonstrating operation of the interlock device in the gas insulation switchgear which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating operation of the interlock device in the gas insulation switchgear which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating operation of the interlock device in the gas insulation switchgear which concerns on Embodiment 1.
  • FIG. 1 is a figure for demonstrating operation of the interlock device in the gas insulation switchgear which concerns on Embodiment 1.
  • FIG. 9 is a cross-sectional view seen from the FF direction in FIG. 9A. It is a top view which shows the structure of the test terminal attached to the power charging terminal of the gas insulation switchgear which concerns on Embodiment 1. FIG. It is a side view which shows the structure of the test terminal.
  • FIG. 1 is a right side view showing the configuration of the gas-insulated switchgear according to the first embodiment.
  • the gas-insulated switchgear 1 has a plurality of compartments inside the housing.
  • the bus 3 of the bus chamber 3a is connected to the conductor inside the tank 2 via the bus bushing 4.
  • An insulating gas is sealed inside the tank 2, and a disconnector 5 with a grounding switch and a circuit breaker 6 connected to the disconnector 5 with a grounding switch are provided.
  • the circuit breaker 6 is via a cable bushing 7. , It is connected to the cable 8 of the cable chamber 8a, and power is supplied from the cable 8 to the load.
  • a disconnector may be further connected between the circuit breaker 6 and the cable 8.
  • the disconnector 5 with a grounding switch is connected to the bus 3 side during the operation of the gas-insulated switch 1, but when the circuit breaker 6 is grounded, it is released from the bus 3 and power is applied outside the tank 2. It is connected to the terminal 9 side and is grounded via the ground conductor 11.
  • a controller 5a for controlling the disconnector 5 with a grounding switch and a controller 6a for controlling the circuit breaker 6 are housed in the control equipment room 5b in front of the housing of the tank 2, a controller 5a for controlling the disconnector 5 with a grounding switch and a controller 6a for controlling the circuit breaker 6 are housed.
  • the door 9a of the terminal chamber 9b which is the compartment in which the power charging terminal 9 is housed, is opened, and test instruments such as a test terminal and a test power supply, which will be described later, are connected.
  • the door 9a may also serve as the front door of the housing of the gas-insulated switchgear 1.
  • FIG. 2A, 2B, and 2C are views showing the structure of the terminal chamber 9b in which the power charging terminal 9 is housed, and are views taken from the direction AA in FIG. 1, respectively.
  • 2B is a diagram showing a state in which the door 9a is opened in FIG. 2A
  • FIG. 2C is a diagram showing a state in which the grounding bar 10 is opened in FIG. 2B.
  • FIG. 2A shows a state in which the ground bar 10 is connected to the power charging terminals 9 for three phases.
  • One end of the grounding bar 10 is rotatably attached to the grounding bar support 12, and when connected to the power charging terminal 9, the other end is engaged in the interlock device 13. Further, a grounding conductor 11 is attached to the grounding bar support 12, and the grounding bar 10 is grounded via the grounding conductor 11.
  • FIG. 3 is a view seen from the direction BB in FIG. 2A.
  • the connection portion 91 of the power charging terminal 9 has a junction structure, and the ground bar 10 is sandwiched and connected to the junction structure from the horizontal direction.
  • the power charging terminal 9 is short-circuited to the ground by the ground bar 10 in all three phases, and is used as the ground terminal of the disconnector 5 with a ground switch.
  • the disconnector 5 with a grounding switch is turned on to the power charging terminal 9
  • the circuit breaker 6 is turned on (the circuit breaker is closed), and then the grounding bar 10 is opened for power charging.
  • the terminal 9 and the test instrument will be connected.
  • FIG. 2B shows a state in which the disconnector 5 with a grounding switch is inserted into the power charging terminal 9 side, the circuit breaker 6 is inserted (the circuit breaker is closed), and then the door 9a is opened.
  • the grounding bar 10 is disengaged from the interlocking device 13 side, rotated horizontally around the grounding bar support 12 side, and the grounding bar 10 is released from the power charging terminal 9. Will be done.
  • FIG. 4A is a plan view showing the structure of the tip of the grounding bar 10
  • FIG. 4B is a side view showing the structure of the tip of the grounding bar.
  • an L-shaped metal fitting 10a protruding upward and an engaging metal fitting 10b having a hook-shaped tip are attached to the tip of the grounding bar 10, and the tip of the engaging metal fitting 10b is inside the interlock device 13. Engage.
  • FIG. 5A is a diagram showing the structure of the interlock device 13, and is a view seen from the CC direction in FIG. 2A.
  • FIG. 5B is a view seen from the EE direction in FIG. 5A.
  • FIG. 6 is a view seen from the DD direction in FIG. 2C, and shows a state in which the ground bar 10 is opened.
  • the grounding bar 10 is connected to the power charging terminal 9
  • the L-shaped metal fitting 10a of the grounding bar 10 hits the frame of the interlock device 13 due to the horizontal rotation of the grounding bar 10. It touches and acts as a stopper.
  • the actuator of the microswitch 13a protrudes from the surface of the frame of the interlock device 13 that comes into contact with the L-shaped metal fitting 10a, and detects the insertion state, that is, the connected state and the open state of the grounding bar 10 into the power charging terminal 9. It plays the role of a sensor.
  • the detected signal is output as an interlock signal to the controller 5a that controls the disconnector 5 with a grounding switch and the controller 6a that controls the circuit breaker 6.
  • the L-shaped metal fitting 10a comes into contact with the frame of the interlock device 13 and pushes the actuator of the microswitch 13a protruding from the contact surface. Further, the tip of the engaging metal fitting 10b engages with the solenoid movable iron core 13b1 below the solenoid 13b.
  • the solenoid 13b of the interlock device 13 receives an interlock signal from the controller 5a that controls the disconnector 5 with a grounding switch and the controller 6a that controls the circuit breaker 6, and the circuit breaker 6 is turned on (the circuit breaker is closed).
  • FIGS. 7A to 7D are views showing the relationship between the interlock device 13 having the microswitch 13a and the solenoid 13b and the ground bar.
  • FIG. 7A shows a state in which the tip of the engaging metal fitting 10b of the grounding bar is engaged with the solenoid movable iron core 13b1. This indicates that, for example, the gas-insulated switchgear 1 is in operation during normal operation, the grounding bar 10 is inserted into the power charging terminal 9, and the power charging terminal 9 is grounded.
  • the circuit breaker 6 is closed, the disconnector 5 with a grounding switch is connected to the bus 3, the solenoid 13b is not excited, and the grounding bar 10 cannot be opened. It prevents the grounding of the power charging terminal 9 from being inadvertently released.
  • FIG. 7B shows the state when the cable withstand voltage test is performed.
  • the circuit breaker 6 When conducting a cable withstand voltage test, the circuit breaker 6 is turned on (the circuit breaker is closed), the disconnector 5 with a grounding switch is connected to the power charging terminal 9, and the power charging terminal 9 is connected to the cable 8. Form a circuit.
  • the solenoid 13b receives an interlock signal from each of the controllers 5a and 6a and is excited, and the solenoid movable iron core 13b1 rises, so that the grounding bar 10 can be opened.
  • the microswitch 13a detects the opening of the grounding bar 10 as shown in FIG. 7C, and outputs an interlock signal indicating that the grounding is released to the controllers 5a and 6a. ..
  • the controllers 5a and 6a cannot operate the disconnector 5 with a grounding switch and the circuit breaker 6, and the grounding bar 10 is again operated. Until it is inserted, the disconnector 5 with a grounding switch and the circuit breaker 6 cannot be operated carelessly.
  • FIG. 8 is a diagram showing a configuration in which a pedestal 30 composed of insulating parts is arranged in front of and in front of the power charging terminal 9 in a state where the ground bar 10 of FIG. 2C is open.
  • FIG. 9A shows a state in which the test terminals 31 corresponding to each phase are arranged on the pedestal 30 shown in FIG. 8 and the test terminals 31 are inserted into the junction of the connection portion 91 of the power charging terminal 9. It is a figure.
  • FIG. 9B shows a cross-sectional view seen from the FF direction in FIG. 9A. The ground conductor 11 in FIGS. 8 and 9A is omitted.
  • FIG. 9A shows a state in which the test terminals 31 corresponding to each phase are arranged on the pedestal 30 shown in FIG. 8 and the test terminals 31 are inserted into the junction of the connection portion 91 of the power charging terminal 9. It is a figure.
  • FIG. 9B shows a cross-sectional view seen from the FF direction in FIG. 9A. The
  • FIG. 10A is a plan view showing the structure of the test terminal 31, and FIG. 10B is a side view showing the structure of the test terminal 31.
  • the test terminal 31 is made of a conductive material and has a plug portion 31b made of a rod-shaped part and a power connection portion 31a made of a plate-shaped part. As shown in FIGS. 9A and 9B, the plug portion 31b of the test terminal 31 is inserted into the junction of the connection portion 91 of the power charging terminal 9, and the power supply connection portion 31a fixed by the pedestal 30 is tested outside the housing. It is connected to the power supply 32.
  • a predetermined voltage (DC voltage) is applied to the cable from the test power supply 32, and a withstand voltage test is performed.
  • the test power supply 32 is removed from the test terminal 31, and the plug portion 31b of the test terminal 31 is pulled out from the connection portion 91 of the power charging terminal 9.
  • the pedestal 30 arranged in front of the power charging terminal 9 is removed to prepare for the connection of the ground bar 10.
  • the test terminal 31 is moved to the power charging terminal 9. Since the cable withstand voltage test is performed by connecting to the cable, it is possible to secure the insulation distance between each phase of the test terminal 31 and the ground bar. Further, in FIGS. 2C, 9A, and 9B, if the grounding bar 10 is fastened to the rotating shaft of the grounding bar 10 and the grounding bar support 12 so that the grounding bar 10 can be removed from the grounding bar support 12, the insulation distance can be obtained. It is effective in securing the above, and the operation of the withstand voltage test becomes easy.
  • a rail may be provided inside the grounding bar support 12 so that the grounding bar 10 can be stored along the grounding bar support 12.
  • the interlock device 13 that regulates the grounding and opening operations of the grounding bar 10 since the interlock device 13 that regulates the grounding and opening operations of the grounding bar 10 is provided, the grounding and opening states of the grounding bar 10 and the circuit breaker 5 with the grounding switch and the circuit breaker are cut off. Since the controllers 5a and 6a of the device 6 are interlocked with each other to regulate the operation of the grounding bar 10 or the circuit breaker 5 with the grounding switch and the circuit breaker 6, careless operation can be avoided and a short circuit occurs. It is possible to avoid accidents and the like, and it is possible to provide a highly reliable gas-insulated switchgear.
  • the interlock device 13 is provided with the solenoid 13b, and the tip of the grounding bar 10 engages the hook-shaped engaging metal fitting 10b with the solenoid movable iron core 13b1, but the present invention is not limited to this. Even if the tip of the engaging metal fitting 10b is not hook-shaped, it may have a hole shape that can be engaged and disengaged by raising and lowering the solenoid movable iron core 13b1.
  • the ground switch 5 and the circuit breaker 6 between the bus 3 and the cable 8 are grounded.
  • the circuit breaker 5 with a device is opened 3 from the bus, grounded via the power charging terminal 9, the circuit breaker 6 is turned on (closed), and the circuit breaker 5 with a grounding switch and the circuit breaker are closed.
  • a circuit to the cable 8 is formed via the cable 8, and then the grounding bar for grounding the power charging terminal 9 is horizontally rotated from the power charging terminal 9 in the terminal chamber to retract the power charging terminal 9, and then the unit is charged.
  • the test equipment Since the test equipment is connected to the electrical terminal 9, it is possible to easily switch to the withstand voltage test mode, and the insulation distance from the power charging terminal 9 of each phase can be secured in the terminal chamber 9b. , The withstand voltage test of the cable 8 can be easily carried out. Further, since the disconnector 5 with a grounding switch and the controllers 5a and 6a of the circuit breaker 6 are interlocked with each other by an interlock signal according to the closing and opening states of the grounding bar 10, the operation of the grounding bar 10 or the disconnecting with a grounding switch is performed. Regulate the operation of the device 5 and the disconnector 6. As a result, careless operation during the withstand voltage test can be avoided, a short circuit accident or the like can be avoided, and a highly reliable withstand voltage test method for the cable 8 of the gas-insulated switchgear can be provided. ..

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas-Insulated Switchgears (AREA)
PCT/JP2020/009689 2020-03-06 2020-03-06 ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法 WO2021176687A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2208527.8A GB2606290B (en) 2020-03-06 2020-03-06 Gas-insulated switchgear and cable withstand voltage testing method for gas-insulated switchgear
JP2022504914A JP7254241B2 (ja) 2020-03-06 2020-03-06 ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法
CN202080097566.4A CN115152110B (zh) 2020-03-06 2020-03-06 气体绝缘开闭装置以及气体绝缘开闭装置的电缆耐电压试验方法
PCT/JP2020/009689 WO2021176687A1 (ja) 2020-03-06 2020-03-06 ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/009689 WO2021176687A1 (ja) 2020-03-06 2020-03-06 ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法

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Publication Number Publication Date
WO2021176687A1 true WO2021176687A1 (ja) 2021-09-10

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PCT/JP2020/009689 WO2021176687A1 (ja) 2020-03-06 2020-03-06 ガス絶縁開閉装置及びガス絶縁開閉装置のケーブル耐電圧試験方法

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JP (1) JP7254241B2 (enrdf_load_stackoverflow)
CN (1) CN115152110B (enrdf_load_stackoverflow)
GB (1) GB2606290B (enrdf_load_stackoverflow)
WO (1) WO2021176687A1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114217183A (zh) * 2021-11-25 2022-03-22 广东电网有限责任公司广州供电局 一种gis电缆装置
CN114397537A (zh) * 2021-12-02 2022-04-26 中国大唐集团科学技术研究院有限公司火力发电技术研究院 一种海上66kV海缆耐压试验便携性优化方法
CN114428202A (zh) * 2022-01-30 2022-05-03 浙江华仪电器科技有限公司 一种开关柜电缆的检测装置以及检测方法
CN116147708A (zh) * 2023-03-14 2023-05-23 国家能源集团宁夏煤业有限责任公司 气体绝缘开关柜的试验系统
WO2025097698A1 (zh) * 2023-11-10 2025-05-15 许继德理施尔电气有限公司 一种气体绝缘环网柜及接地开关

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JPS5822008U (ja) * 1981-07-28 1983-02-10 株式会社小保工業所 高電圧機器類の安全装置
JPH0186414U (enrdf_load_stackoverflow) * 1987-11-28 1989-06-08
JPH0363014U (enrdf_load_stackoverflow) * 1989-10-18 1991-06-20
JPH07222315A (ja) * 1994-02-02 1995-08-18 Nissin Electric Co Ltd ガス絶縁開閉装置
JP2002374605A (ja) * 2001-06-13 2002-12-26 Toko Electric Corp 開閉器

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JPH06335125A (ja) * 1993-03-12 1994-12-02 Mitsubishi Electric Corp 開閉装置
JP3286223B2 (ja) * 1997-10-15 2002-05-27 三菱電機株式会社 開閉装置
JP2000067708A (ja) * 1998-08-13 2000-03-03 Meidensha Corp 断路器、接地開閉器及び接地開閉器付断路器
JP2000350318A (ja) * 1999-05-31 2000-12-15 Toshiba Corp ガス絶縁接地開閉器
JP4556614B2 (ja) * 2004-10-25 2010-10-06 富士電機機器制御株式会社 漏電遮断器

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Publication number Priority date Publication date Assignee Title
JPS5822008U (ja) * 1981-07-28 1983-02-10 株式会社小保工業所 高電圧機器類の安全装置
JPH0186414U (enrdf_load_stackoverflow) * 1987-11-28 1989-06-08
JPH0363014U (enrdf_load_stackoverflow) * 1989-10-18 1991-06-20
JPH07222315A (ja) * 1994-02-02 1995-08-18 Nissin Electric Co Ltd ガス絶縁開閉装置
JP2002374605A (ja) * 2001-06-13 2002-12-26 Toko Electric Corp 開閉器

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114217183A (zh) * 2021-11-25 2022-03-22 广东电网有限责任公司广州供电局 一种gis电缆装置
CN114217183B (zh) * 2021-11-25 2024-05-28 广东电网有限责任公司广州供电局 一种gis电缆装置
CN114397537A (zh) * 2021-12-02 2022-04-26 中国大唐集团科学技术研究院有限公司火力发电技术研究院 一种海上66kV海缆耐压试验便携性优化方法
CN114428202A (zh) * 2022-01-30 2022-05-03 浙江华仪电器科技有限公司 一种开关柜电缆的检测装置以及检测方法
CN116147708A (zh) * 2023-03-14 2023-05-23 国家能源集团宁夏煤业有限责任公司 气体绝缘开关柜的试验系统
WO2025097698A1 (zh) * 2023-11-10 2025-05-15 许继德理施尔电气有限公司 一种气体绝缘环网柜及接地开关

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Publication number Publication date
CN115152110B (zh) 2025-08-22
GB202208527D0 (en) 2022-07-27
GB2606290A (en) 2022-11-02
GB2606290B (en) 2025-04-16
CN115152110A (zh) 2022-10-04
JPWO2021176687A1 (enrdf_load_stackoverflow) 2021-09-10
JP7254241B2 (ja) 2023-04-07

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