CN114142385A - 10kV sulfur hexafluoride gas pressure relief ring main unit - Google Patents
10kV sulfur hexafluoride gas pressure relief ring main unit Download PDFInfo
- Publication number
- CN114142385A CN114142385A CN202111386638.XA CN202111386638A CN114142385A CN 114142385 A CN114142385 A CN 114142385A CN 202111386638 A CN202111386638 A CN 202111386638A CN 114142385 A CN114142385 A CN 114142385A
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- China
- Prior art keywords
- pressure relief
- cabinet body
- cover
- sulfur hexafluoride
- hexafluoride gas
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- Legal status (The legal status 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 status listed.)
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- 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
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- 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
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
-
- 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
- H02B13/045—Details of casing, e.g. gas tightness
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Pressure Vessels And Lids Thereof (AREA)
- Patch Boards (AREA)
Abstract
The invention relates to a 10kV sulfur hexafluoride gas pressure relief ring main unit, and belongs to the technical field of power distribution equipment. The cabinet comprises a cabinet body and a U-shaped cover, wherein a cabinet door is arranged on the cabinet body, pressure relief openings are respectively formed in two sides of the cabinet body, a pressure relief window is fixedly arranged outside each pressure relief opening, the U-shaped cover is arranged outside the cabinet body and fixedly connected with the cabinet body, a through hole is formed in the top of the U-shaped cover, a second pressure relief assembly is arranged above each through hole and comprises an installation frame and a top cover, square air outlets are formed in the periphery of the installation frame, the bottom ends of the square air outlets are fixedly connected with the U-shaped cover, side cover plates are arranged on the outer sides of the square air outlets, the top ends of the side cover plates are rotatably connected with the installation frame, the top cover is sleeved on the top ends of the installation frame and the side cover plates, and a reset assembly for resetting the top cover is further arranged in the installation frame; the invention solves the problems of poor safety and the like during pressure relief of the ring main unit in the prior art.
Description
Technical Field
The invention relates to a 10kV sulfur hexafluoride gas pressure relief ring main unit, and belongs to the technical field of power distribution equipment.
Background
At present, the insulation of the 10kV ring main unit mainly comprises gas insulation, return body insulation and environment-friendly gas insulation. The gas insulation is mainly SF6 gas at present, and SF6 gas has very stable chemical properties, excellent insulation and arc extinguishing performance, and the SF6 gas insulation ring main unit is small in size, compact in structure and extremely strong in adaptability.
In the traditional gas ring main unit, for the rear part of a sulfur hexafluoride gas ring main unit body in a 10kV power distribution project room, a switch pressure relief opening is arranged at the middle lower part and the middle upper part, and when a fault occurs in the switch, SF6 gas generates higher pressure, and then the pressure is released from the pressure relief opening; when the pressure relief port releases pressure, the baffle fixed on the pressure relief port can be separated due to the pressure, and the baffle is easy to hurt people in a high-pressure environment.
The prior art application No. 201810290565.6 discloses an interlocking pressure relief ring main unit with good protection performance, which comprises a main body and a pressure relief interlocking structure, wherein the main body is of a double-layer structure consisting of an outer side plate and an inner side plate, the outer side plate and the inner side plate surround a longitudinal air exchange channel at the left side and the right side of the main body and a transverse air exchange channel at the top of the main body, the longitudinal air exchange channel and the transverse air exchange channel are communicated, an air inlet is arranged at the middle part of the longitudinal air exchange channel and on the outer side plate, an axial flow fan is arranged inside the air inlet, pressure relief ports communicated with the outside of the main body are arranged at the middle part of the transverse air exchange channel, the outer side plate and the inner side plate, a base used for air outlet is arranged at the lower part of the main body, a vent communicated with the main body is arranged at the upper end face of the base, and exhaust ports are arranged at the left side and the right side of the base; the pressure relief interlocking structure comprises a first pressure elastic piece, a second pressure elastic piece, a ventilation sealing plate, a pressure relief cover plate and a controller, wherein the ventilation sealing plate is arranged at two ends of a transverse ventilation channel, the ventilation sealing plate is vertically arranged, the upper end of the ventilation sealing plate is hinged to the inner side of an outer side plate at the top, the lower end of the ventilation sealing plate is a free end and is used for sealing and isolating the communication between the transverse ventilation channel and a longitudinal ventilation channel, the first pressure elastic piece is transversely arranged, the fixed end of the first pressure elastic piece is arranged at the inner side of an outer side plate at the upper part of the longitudinal ventilation channel, the elastic end of the first pressure elastic piece is fixedly connected with the free end of the ventilation sealing plate, the pressure relief cover plate covers the upper part of a pressure relief opening, the second pressure elastic piece is vertically arranged, the fixed end of the second pressure elastic piece is fixed on the upper surface of the inner side plate of the pressure relief opening, and the elastic end of the second pressure relief cover plate is fixed on the lower surface of the pressure relief cover plate; first pressure elastic component, second pressure elastic component are electric pressure sensing device, and first pressure elastic component is the form of stretching out under the normal condition, and second pressure elastic component is the compression form under the normal condition, and the two all is connected with the controller electricity, and the controller is through gathering the state of first pressure elastic component and then whether control second pressure elastic component moves.
The looped network cabinet in the prior art has the problems of poor safety and the like during pressure relief, so the invention provides a 10kV sulfur hexafluoride gas pressure relief looped network cabinet for solving the problems.
Disclosure of Invention
In order to overcome the defects of poor safety and the like in pressure relief of the conventional ring main unit, the invention designs the 10kV sulfur hexafluoride gas pressure relief ring main unit, and when a fault occurs, SF6 gas in the main unit body can pass through a specific pressure relief channel, so that the safety of field workers is not endangered, and meanwhile, adjacent equipment is not influenced by the fault equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a 10kV sulfur hexafluoride gas pressure release looped netowrk cabinet, includes the cabinet body and U-shaped cover, be provided with the cabinet door on the cabinet body, open respectively the cabinet body both sides has the pressure release mouth, the outer equal fixed mounting of pressure release mouth has the pressure release window, the U-shaped cover set up the external and with cabinet body fixed connection of cabinet, open at the U-shaped cover top has the through-hole, the through-hole top is equipped with second pressure release subassembly, second pressure release subassembly includes installing frame and top cap, square gas outlet and bottom and U-shaped cover fixed connection have all been opened all around to the installing frame, the square gas outlet outside all is equipped with the side cap board, the side cap board top rotates with the installing frame to be connected, the top cap cup joints on installing frame and side cap board top, the top cap is the looks adaptation with the assembly of installing frame and side cap board, still is provided with the reset assembly who is used for making the top cap reset in the installing frame.
The utility model discloses a cabinet body, including cabinet body, articulated seat, reset spring, hinge seat, connecting pipe, hemisphere cover, connecting pipe bottom, the cabinet body is inserted to the cabinet body, and the cabinet body is internal, the hemisphere cover sets up at the connecting pipe top, articulated seat set up in one side of connecting pipe and with cabinet body fixed connection, hemisphere cover one side is articulated with articulated seat, second stand fixed connection is at internal wall of cabinet, the second stand sets up in articulated seat below, hemisphere cover inner wall fixedly connected with arc pole, the internal and reset spring that is connected with of cabinet is inserted to the arc pole bottom, the reset spring other end is connected with the second stand.
The reset assembly comprises a sleeve, the bottom end of the sleeve is fixedly connected with the U-shaped cover, a tension spring and a connecting rod are sleeved in the sleeve, the bottom end of the tension spring is connected with the U-shaped cover, the top end of the tension spring is connected with the connecting rod, and the connecting rod is fixedly connected with the top cover.
The U-shaped cover is internally provided with a guide plate, the guide plate is arranged below the through hole, two ends of the guide plate are connected with the inner wall of the U-shaped cover, and the bottom end of the U-shaped cover is abutted against the top end of the cabinet body.
The sleeve is provided with a long hole, a limiting block is arranged between the tension spring and the connecting rod, and two ends of the limiting block extend outwards and penetrate out of the long hole.
A plurality of first pressure release components are distributed in a rectangular array.
And sulfur hexafluoride gas is filled in the cabinet door and the U-shaped cover, and the air pressure of the sulfur hexafluoride gas in the cabinet door and the U-shaped cover is the same.
And a circle of rubber ring for sealing is fixedly arranged at the top end of the connecting pipe.
The number of the pressure relief ports on two sides of the cabinet body is two.
The pressure relief window is fixedly connected with the cabinet body through a plastic nail.
Compared with the prior art, the invention has the following characteristics and beneficial effects: according to the invention, through the arrangement of the U-shaped cover and the second pressure relief assembly, the injury of a pressure relief window to personnel caused by high-pressure explosion can be prevented, meanwhile, the side cover plate and the top cover in the second pressure relief assembly can seal the inside of the U-shaped cover, the reset assembly can reset the top cover, and after pressure is discharged, oxygen in air is prevented from entering, so that the flame-retardant effect is achieved;
according to the invention, through the arrangement of the first pressure relief assembly, the first pressure relief assembly can be opened before the pressure relief window due to the arrangement of the reset spring and the hemispherical cover when the internal pressure of the cabinet is low, so that the internal pressure of the cabinet is relieved, the replacement of the pressure relief window is avoided, and meanwhile, the first pressure relief assembly and the pressure relief window can be opened together when the internal pressure of the cabinet is high, so that the pressure relief efficiency and speed are increased;
according to the invention, the top cover can be automatically reset through the arrangement of the reset assembly, so that the side cover plate is pressed to block the air outlet, and the long hole and the limiting block of the sleeve can ensure that the top cover is not separated and can accurately reset.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the cabinet of the present invention;
FIG. 3 is a front elevational view, in full section, of the present invention;
fig. 4 is a partial enlarged view of a in fig. 3 according to the present invention.
Wherein the reference numerals are: 10. a cabinet body; 11. a cabinet door; 12. a pressure relief port; 13. a pressure relief window; 14. plastic nails; 20. a first pressure relief assembly; 21. a connecting pipe; 211. a rubber ring; 22. a hemispherical cover; 23. a hinged seat; 24. an arcuate bar; 25. a second upright post; 26. a return spring; 30. a U-shaped cover; 31. a through hole; 32. a guide plate; 40. a second pressure relief assembly; 41. installing a frame; 411. a square air outlet; 42. a top cover; 43. a side cover plate; 44. a reset assembly; 441. a sleeve; 442. a tension spring; 443. a long hole; 444. a limiting block; 445. a connecting rod.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-4, the 10kV sulfur hexafluoride gas pressure relief ring main unit of this embodiment includes a main body 10 and a U-shaped cover 30, a cabinet door 11 is disposed on the main body 10, pressure relief openings 12 are respectively opened on two sides of the main body 10, the number of the pressure relief openings 12 on two sides of the main body 10 is two, pressure relief windows 13 are fixedly mounted outside the pressure relief openings 12, the pressure relief windows 13 are fixedly connected with the main body 10 through plastic nails 14, the U-shaped cover 30 is disposed outside the main body 10 and fixedly connected with the main body 10, a through hole 31 is formed at the top of the U-shaped cover 30, a second pressure relief assembly 40 is disposed above the through hole 31, the second pressure relief assembly 40 includes a mounting frame 41 and a top cover 42, square air outlets 411 are respectively formed around the mounting frame 41, the bottom ends of the mounting frame are fixedly connected with the U-shaped cover 30, side cover plates 43 are respectively disposed outside the square air outlets 411, the top ends of the side cover plates 43 are rotatably connected with the mounting frame 41, the top cover 42 is sleeved on the top ends of the mounting frame 41 and the side cover 43, a reset assembly 44 for resetting the top cover 42 is also provided in the mounting frame 41.
Further, a plurality of first pressure relief assemblies 20 are arranged at the top end of the cabinet 10, the plurality of first pressure relief assemblies 20 are distributed in a rectangular array, each first pressure relief assembly 20 comprises a connecting pipe 21 and a hemispherical cover 22, the bottom end of the connecting pipe 21 is inserted into the cabinet body 10 and communicated with the inside of the cabinet body 10, the hemispherical cover 22 is arranged at the top of the connecting pipe 21, a circle of rubber ring 211 for sealing is fixedly arranged at the top end of the connecting pipe 21, the hinged base 23 is arranged at one side of the connecting pipe 21 and fixedly connected with the cabinet body 10, one side of the hemispherical cover 22 is hinged with the hinged base 23, the second upright post 25 is fixedly connected to the inner wall of the cabinet body 10, the second upright post 25 is arranged under the hinged base 23, the inner wall of the hemispherical cover 22 is fixedly connected with an arc-shaped rod 24, the bottom end of the arc-shaped rod 24 is inserted into the cabinet body 10 and connected with a reset spring 26, and the other end of the reset spring 26 is connected with the second upright post 25; when the pressure in the cabinet 10 is too high, the hemispherical cover 22 is pushed away by the pressure, and then the hemispherical cover 22 drives the arc rod 24 to rotate, so that the return spring 26 is stretched, and after the pressure is reduced, the hemispherical cover 22 can return under the action of the return spring 26.
Further, the reset assembly 44 comprises a sleeve 441, the bottom end of the sleeve 441 is fixedly connected with the U-shaped cover 30, a tension spring 442 and a connecting rod 445 are sleeved in the sleeve 441, the bottom end of the tension spring 442 is connected with the U-shaped cover 30, the top end of the tension spring 442 is connected with the connecting rod 445, the top end of the connecting rod 445 is fixedly connected with the top cover 42, a long hole 443 is formed in the sleeve 441, a limit block 444 is arranged between the tension spring 442 and the connecting rod 445, and two ends of the limit block 444 extend outwards and penetrate out of the long hole 443; when the internal pressure of the U-shaped cover 30 is too high, the top cover 42 is jacked up and moves upwards by the pressure, the top cover 42 drives the connecting rod 445 to move upwards in the process of moving upwards, the tension spring 442 is stretched, then the top cover 42 does not block the side cover plate, the side cover plate can release the pressure, the long hole 443 and the limiting block 444 can guide and limit the movement of the top cover 42, the top cover 42 is prevented from being separated, and the top cover 42 is ensured to be accurately returned.
Further, a guide plate 32 is arranged in the U-shaped cover 30, the guide plate 32 is arranged right below the through hole 31, two ends of the guide plate 32 are connected with the inner wall of the U-shaped cover 30, and the bottom end of the U-shaped cover 30 abuts against the top end of the cabinet body 10.
Furthermore, sulfur hexafluoride gas is filled in the cabinet door 11 and the U-shaped cover 30, and the gas pressure of the sulfur hexafluoride gas in the cabinet door 11 and the U-shaped cover 30 is the same.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a 10kV sulfur hexafluoride gas pressure release looped netowrk cabinet which characterized in that: the cabinet comprises a cabinet body (10) and a U-shaped cover (30), wherein a cabinet door (11) is arranged on the cabinet body (10), pressure relief openings (12) are respectively opened at two sides of the cabinet body (10), a pressure relief window (13) is fixedly installed outside each pressure relief opening (12), the U-shaped cover (30) is arranged outside the cabinet body (10) and fixedly connected with the cabinet body (10), a through hole (31) is opened at the top of the U-shaped cover (30), a second pressure relief assembly (40) is arranged above the through hole (31), the second pressure relief assembly (40) comprises a mounting frame (41) and a top cover (42), a square air outlet (411) and the bottom end of the mounting frame (41) are fixedly connected with the U-shaped cover (30), a side cover plate (43) is arranged at the outer side of the square air outlet (411), the top end of the side cover plate (43) is rotatably connected with the mounting frame (41), and the top cover (42) is sleeved on the top of the mounting frame (41) and the side cover plate (43), a resetting component (44) for resetting the top cover (42) is also arranged in the mounting frame (41).
2. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 1, wherein: the cabinet body (10) top is provided with a plurality of first pressure relief assemblies (20), first pressure relief assembly (20) includes connecting pipe (21), hemisphere cover (22), articulated seat (23) and second stand (25), the cabinet body (10) and the inside intercommunication of the cabinet body (10) are inserted to connecting pipe (21) bottom, hemisphere cover (22) sets up at connecting pipe (21) top, articulated seat (23) set up in one side of connecting pipe (21) and with cabinet body (10) fixed connection, hemisphere cover (22) one side is articulated with articulated seat (23), second stand (25) fixed connection is at cabinet body (10) inner wall, second stand (25) set up in articulated seat (23) below, hemisphere cover (22) inner wall fixed connection has arc pole (24), arc pole (24) bottom is inserted in the cabinet body (10) and is connected with reset spring (26), the other end of the return spring (26) is connected with the second upright post (25).
3. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 1, wherein: the reset assembly (44) comprises a sleeve (441), the bottom end of the sleeve (441) is fixedly connected with the U-shaped cover (30), a tension spring (442) and a connecting rod (445) are sleeved in the sleeve (441), the bottom end of the tension spring (442) is connected with the U-shaped cover (30), the top end of the tension spring is connected with the connecting rod (445), and the connecting rod (445) is fixedly connected with the top cover (42).
4. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 1, wherein: be provided with deflector (32) in U-shaped cover (30), deflector (32) set up in through-hole (31) below, deflector (32) both ends and U-shaped cover (30) inner wall connection, U-shaped cover (30) bottom is contradicted on cabinet body (10) top.
5. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 3, wherein: a long hole (443) is formed in the sleeve (441), a limiting block (444) is arranged between the tension spring (442) and the connecting rod (445), and two ends of the limiting block (444) extend outwards and penetrate out of the long hole (443).
6. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 2, wherein: the first pressure relief assemblies (20) are distributed in a rectangular array.
7. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 1, wherein: sulfur hexafluoride gas is filled in the cabinet door (11) and the U-shaped cover (30), and the air pressure of the sulfur hexafluoride gas in the cabinet door (11) and the U-shaped cover (30) is the same.
8. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 2, wherein: the top end of the connecting pipe (21) is fixedly provided with a circle of rubber ring (211) for sealing.
9. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 1, wherein: the number of the pressure relief openings (12) on the two sides of the cabinet body (10) is two.
10. The 10kV sulfur hexafluoride gas pressure relief ring main unit as claimed in claim 1, wherein: the pressure relief window (13) is fixedly connected with the cabinet body (10) through a plastic nail (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111386638.XA CN114142385B (en) | 2021-11-22 | 2021-11-22 | 10kV sulfur hexafluoride gas pressure relief ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111386638.XA CN114142385B (en) | 2021-11-22 | 2021-11-22 | 10kV sulfur hexafluoride gas pressure relief ring main unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114142385A true CN114142385A (en) | 2022-03-04 |
| CN114142385B CN114142385B (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111386638.XA Active CN114142385B (en) | 2021-11-22 | 2021-11-22 | 10kV sulfur hexafluoride gas pressure relief ring main unit |
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| Country | Link |
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| CN (1) | CN114142385B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116154655A (en) * | 2023-04-13 | 2023-05-23 | 江苏国控电力设备有限公司 | Pressure relief device and switch cabinet thereof |
| CN117239613A (en) * | 2023-08-23 | 2023-12-15 | 衡阳市官慕机电设备有限公司 | Arc extinction switch cabinet |
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| CN203335956U (en) * | 2013-07-02 | 2013-12-11 | 艾默生网络能源有限公司 | Equipment cabinet pressure relief device and equipment cabinet |
| CN108448474A (en) * | 2018-03-30 | 2018-08-24 | 河南金土商贸有限公司 | A kind of interlocking pressure release ring main unit automatically controlled |
| CN209627893U (en) * | 2018-12-10 | 2019-11-12 | 孙九顺 | A kind of Electric Appliance Cabinet with decompression function |
| CN211182862U (en) * | 2019-11-27 | 2020-08-04 | 河南平智电气有限公司 | Pressure release type switch board |
-
2021
- 2021-11-22 CN CN202111386638.XA patent/CN114142385B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203335956U (en) * | 2013-07-02 | 2013-12-11 | 艾默生网络能源有限公司 | Equipment cabinet pressure relief device and equipment cabinet |
| CN108448474A (en) * | 2018-03-30 | 2018-08-24 | 河南金土商贸有限公司 | A kind of interlocking pressure release ring main unit automatically controlled |
| CN209627893U (en) * | 2018-12-10 | 2019-11-12 | 孙九顺 | A kind of Electric Appliance Cabinet with decompression function |
| CN211182862U (en) * | 2019-11-27 | 2020-08-04 | 河南平智电气有限公司 | Pressure release type switch board |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116154655A (en) * | 2023-04-13 | 2023-05-23 | 江苏国控电力设备有限公司 | Pressure relief device and switch cabinet thereof |
| CN116154655B (en) * | 2023-04-13 | 2023-06-27 | 江苏国控电力设备有限公司 | Pressure relief device and switch cabinet thereof |
| CN117239613A (en) * | 2023-08-23 | 2023-12-15 | 衡阳市官慕机电设备有限公司 | Arc extinction switch cabinet |
| CN117239613B (en) * | 2023-08-23 | 2024-04-05 | 国网宁夏电力有限公司石嘴山供电公司 | Arc extinction switch cabinet |
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| CN114142385B (en) | 2023-09-22 |
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