CN114068229A - Three-station isolating switch integrated operating mechanism for circuit breaker for switch cabinet - Google Patents
Three-station isolating switch integrated operating mechanism for circuit breaker for switch cabinet Download PDFInfo
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- CN114068229A CN114068229A CN202111397986.7A CN202111397986A CN114068229A CN 114068229 A CN114068229 A CN 114068229A CN 202111397986 A CN202111397986 A CN 202111397986A CN 114068229 A CN114068229 A CN 114068229A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005381 potential energy Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a three-station disconnecting switch integrated operating mechanism for a circuit breaker for a switch cabinet, relates to the field of circuit breakers, and aims to solve the problems that a circuit breaker in the circuit breaker cannot be operated in a three-station integrated mode and the like. This device possesses the cross main shaft and will drive first gear revolve when the pivoted, the rotation in two second gear opposite directions of first gear engagement, it is the same with the second curved arm that opens circuit simultaneously, first curved arm that opens circuit also is connected with two other stations on the circuit breaker through first fixing bolt, and receive the rotation effect of cross countershaft down, first curved arm that opens circuit breaks two other circuit breaker stations, and then realize the integrative operation that opens circuit of three stations, and reset spring's elastic potential energy, force first pivot can be quick gyration to original position, realize quick realization combined floodgate.
Description
Technical Field
The invention relates to the field of circuit breakers, in particular to a three-station disconnecting switch integrated operating mechanism for a circuit breaker for a switch cabinet.
Background
The circuit breaker is widely used in industrial production and daily life, and has the main functions of closing and opening a circuit, namely an air switch, a safety catch and a fuse-free switch, and the circuit breaker can cut off the circuit under the conditions of short circuit and serious overload, so that electric appliances in the circuit, a high-voltage circuit breaker, most commonly a gas circuit breaker and a vacuum circuit breaker, and vacuum circuit breakers are mostly adopted in power systems of 35kV and below; more than 35kV electric power system then adopts gas circuit breaker (SF6 circuit breaker) more, and the multistation knife switch concurrent operation can't be realized to most circuit breakers to and when the circuit breaker closes a floodgate, can't accomplish fast closing, and for this reason propose one kind be used for circuit breaker three-station isolator integration operating device for cubical switchboard now.
Disclosure of Invention
Objects of the invention
The device is provided with a cross main shaft which rotates and drives a first gear to rotate, two second gears meshed with the first gear rotate in opposite directions and are the same as second breaking bent arms, the first breaking bent arms are connected with the other two stations on the breaker through first fixing bolts, and under the rotation action of a cross auxiliary shaft, the other two breaker stations are broken by the first breaking bent arms, so that the three-station integrated breaking operation is realized, the elastic potential energy of a reset spring and the extrusion force between a first movable plate and a second movable plate force the first rotating shaft to quickly rotate to the original position, the quick switching-on is realized, and the screwing switch can obviously feel the reset spring and the screwing force formed between the first movable plate and the second movable plate during the breaking Resistance, and thus the progress of the disconnection operation can be sensed.
(II) technical scheme
The invention provides a three-station isolating switch integrated operating mechanism for a circuit breaker for a switch cabinet, which comprises a first side plate and a second side plate, wherein support columns are welded at four corners of one side of the first side plate and one side of the second side plate, which are close to each other, one ends of the support columns, which are far away from the first side plate, penetrate through and extend to the left side of the second side plate, one ends of the support columns, which are positioned at the left side of the second side plate, are welded with a limiting panel, one side of the limiting panel, which is close to the second side plate, is respectively and rotatably connected with two cross auxiliary shafts and a cross main shaft, which penetrate through and extend to the right side of the second side plate, one ends, which are positioned at the right side of the second side plate, of the first side plate and one side of the second side plate are both and rotatably connected with one side of the first side plate, first fixing sleeves are welded on outer rings of the first fixing sleeves, first disconnection bent arms are welded on outer rings of the cross main shafts, and a second open-circuit bent arm is welded on the outer ring of the second fixed sleeve.
As a preferable scheme of the invention, the second gears are welded on the outer rings of the cross auxiliary shaft section far away from the first fixed sleeve, the first gear is welded on the outer ring of the cross main shaft section far away from the second fixed sleeve, and the first gear and the two second gears are meshed with each other.
As a preferable scheme of the present invention, a second fixing bolt is sleeved on one end of the second open-circuit bent arm away from the second fixing sleeve, first nuts are respectively disposed on two ends of the second fixing bolt, a first fixing bolt is sleeved on one end of the first open-circuit bent arm away from the first fixing sleeve, and second nuts are respectively sleeved on two ends of the first fixing bolt.
As a preferable scheme of the invention, the connection parts of the cross auxiliary shaft and the cross main shaft with the limiting panel are both provided with rotating columns, and the rotating columns on the cross main shaft are welded with screwing switches.
As a preferred scheme of the present invention, a first rotating shaft is welded at one end of the cross main shaft located on the right side of the first side plate, two first movable plates are welded at one end of the first rotating shaft away from the cross main shaft, a second movable plate is hinged at one end of the first movable plate away from the first rotating shaft, a second rotating shaft is hinged at one end of the second movable plate away from the first movable plate, one end of the second rotating shaft away from the second movable plate is respectively welded with one end of the cross auxiliary shaft close to the first side plate, and a return spring is arranged at one side of the first movable plate and one side of the second movable plate close to each other.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
1. the device realizes that the second fixed sleeve bears force and rotates the second open-circuit bent arm when the cross main shaft rotates by installing the structures of the cross main shaft, the second open-circuit bent arm and the like, the second breaking bent arm is fixed with a knife switch in a first station of the circuit breaker through a second fixing bolt, so that the first station realizes breaking, the cross spindle drives the first gear to rotate while rotating, and the two second gears meshed with the first gear rotate in opposite directions, so that the two first fixed sleeves start to rotate to further rotate the first disconnecting bent arm, meanwhile, the first breaking bent arm is connected with the other two stations on the circuit breaker through a first fixing bolt as the second breaking bent arm, and under the rotation action of the cross auxiliary shaft, the first circuit-breaking bent arm breaks the other two circuit breaker stations, so that the three-station integrated circuit-breaking operation is realized.
2. When the circuit breaker is switched on, the screwing switch is screwed reversely, the elastic potential energy of the reset spring and the extrusion force between the first movable plate and the second movable plate force the first rotating shaft to quickly rotate to the original position while the screwing switch performs reverse screwing action, switching-on is quickly realized, and resistance formed between the reset spring and the first movable plate and the second movable plate can be obviously sensed by screwing the screwing switch during circuit breaking, so that the circuit breaking operation can be sensed.
In summary, the device has the advantages that the cross spindle drives the first gear to rotate while rotating, the two second gears meshed with the first gear rotate in opposite directions, meanwhile, the first breaking bent arm is connected with the other two stations on the circuit breaker through a first fixing bolt as the second breaking bent arm, under the rotation action of the cross auxiliary shaft, the first breaking bent arm breaks the other two circuit breaker stations, further realizing the three-station integrated circuit breaking operation, and the elastic potential energy of the reset spring and the extrusion force between the first movable plate and the second movable plate force the first rotating shaft to quickly rotate to the original position to realize the quick switch-on, when the circuit breaker is disconnected, the resistance formed between the return spring and the first movable plate and the second movable plate can be obviously sensed by screwing the screwing switch, and then the proceeding of the circuit breaker operation can be sensed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an integrated operating mechanism of a three-position disconnecting switch of a circuit breaker for a switch cabinet, which is provided by the invention.
Fig. 2 is a schematic structural view of a cross spindle of the three-position disconnecting switch integrated operating mechanism of the circuit breaker for the switch cabinet.
Fig. 3 is a schematic structural view of a cross auxiliary shaft of the three-position disconnecting switch integrated operating mechanism of the circuit breaker for the switch cabinet.
Fig. 4 is a schematic diagram of a limiting panel structure of an integrated operating mechanism of a three-position disconnecting switch of a circuit breaker for a switch cabinet according to the present invention.
Fig. 5 is a schematic structural view of a return spring of the three-position disconnecting switch integrated operating mechanism of the circuit breaker for the switch cabinet.
Reference numerals: 1. a first side plate; 2. a cross auxiliary shaft; 3. a first open circuit bent arm; 4. a first fixing bolt; 5. a limiting panel; 6. a first fixed sleeve; 7. a second side plate; 8. a second trip arm; 9. a second fixed sleeve; 10. a second fixing bolt; 11. a cross-shaped main shaft; 12. a first gear; 13. rotating the column; 14. screwing a switch; 15. a second gear; 16. a support pillar; 17. a first rotating shaft; 18. a first movable plate; 19. a return spring; 20. a second rotating shaft; 21. a second movable plate.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, identical or similar reference numerals indicate identical or similar parts and features. The drawings are only schematic representations of the concepts and principles of the embodiments of the disclosure, and do not necessarily show specific dimensions or proportions of the various embodiments of the disclosure. Certain features that are part of a particular figure may be exaggerated in order to illustrate relevant details or structures of embodiments of the present disclosure.
The first embodiment is as follows: referring to fig. 1-5, an integrated operating mechanism for a three-station disconnecting switch of a circuit breaker for a switch cabinet comprises a first side plate 1 and a second side plate 7, wherein four corners of one side of the first side plate 1, which is close to the second side plate 7, are welded with supporting columns 16, one end of each supporting column 16, which is far away from the first side plate 1, penetrates through and extends to the left side of the second side plate 7, one end of each supporting column 16, which is located at the left side of the second side plate 7, is welded with a limiting panel 5, one side of each limiting panel 5, which is close to the second side plate 7, is respectively and rotatably connected with two cross countershafts 2 and a cross main shaft 11, which penetrate through and extend to the right side of the second side plate 7, one ends of the cross main shaft 11 and the cross countershafts 2, which are located at the right side of the second side plate 7, are both rotatably connected with one side of the first side plate 1, which is close to the second side plate 7, first fixing sleeves 6 are welded with first disconnection bent arms 3, the outer ring of the cross spindle 11 is welded with a second fixed sleeve 9, and the outer ring of the second fixed sleeve 9 is welded with a second open-circuit bent arm 8.
Example two: referring to fig. 1-5, on the basis of the first embodiment, an integrated operating mechanism for a three-position disconnecting switch of a circuit breaker for a switch cabinet is provided, wherein a section of outer ring of a cross auxiliary shaft 2 away from a first fixing sleeve 6 is welded with a second gear 15, a section of outer ring of a cross main shaft 11 away from a second fixing sleeve 9 is welded with a first gear 12, the first gear 12 and the two second gears 15 are meshed with each other, one end of a second disconnecting bent arm 8 away from the second fixing sleeve 9 is sleeved with a second fixing bolt 10, the second fixing sleeve 9 is stressed and rotates the second disconnecting bent arm 8 while the cross main shaft 11 rotates, and the second disconnecting bent arm 8 is fixed with a knife switch in a first position of the circuit breaker through the second fixing bolt 10, so that the first position is disconnected, two ends of the second fixing bolt 10 are provided with first nuts, one end of the first disconnecting bent arm 3 away from the first fixing sleeve 6 is sleeved with a first fixing bolt 4, the two ends of the first fixing bolt 4 are respectively sleeved with a second nut, the joints of the cross auxiliary shaft 2, the cross main shaft 11 and the limiting panel 5 are respectively provided with a rotating column 13, the cross main shaft 11 drives the first gear 12 to rotate while rotating, two second gears 15 meshed with the first gear 12 rotate in opposite directions, then two first fixing sleeves 6 start to rotate the first breaking bent arm 3, the first breaking bent arm is the same as the second breaking bent arm 8, the first breaking bent arm 3 is also connected with the other two stations on the circuit breaker through the first fixing bolt 4, and under the rotating action of the cross auxiliary shaft 2, the other two circuit breaker stations are broken by the first breaking bent arm 3, so that the three-station integrated circuit breaking operation is realized, and the rotating column 13 on the cross main shaft 11 is further welded with a screwing switch 14.
Example three: referring to fig. 1-5, on the basis of the second embodiment, an integrated operating mechanism for a three-position disconnecting switch of a circuit breaker for a switch cabinet is provided, wherein a first rotating shaft 17 is welded at one end of a cross spindle 11, which is located on the right side of a first side plate 1, two first movable plates 18 are welded at one end of the first rotating shaft 17, which is away from the cross spindle 11, a second movable plate 21 is hinged at one end of each first movable plate 18, which is away from the first rotating shaft 17, and a second rotating shaft 20 is hinged at one end of each second movable plate 21, which is away from the first movable plate 18, when the circuit breaker is switched on, the screwing switch 14 is screwed reversely, and the screwing switch 14 is screwed along with the reverse screwing motion, and the elastic potential energy of the return spring 19 and the pressing force between the first movable plates 18 and the second movable plates 21 force the first rotating shaft 17 to be quickly rotated to the original position, so as to realize quick switching on, when the circuit breaker is disconnected, the resistance formed between the return spring 19 and the first movable plate 18 and the second movable plate 21 can be obviously sensed by screwing the screw switch 14, so that the progress of the circuit breaker operation can be sensed, one end of the second rotating shaft 20, which is far away from the second movable plate 21, is respectively welded with one end of the cross auxiliary shaft 2, which is close to the first side plate 1, and the sides, which are close to each other, of the first movable plate 18 and the second movable plate 21 are both provided with the return spring 19.
The working principle and the concrete explanation of the invention are as follows:
when the device carries out the circuit breaking operation on the circuit breaker, the screwing switch 14 is screwed, the cross spindle 11 which is pulled by the rotating force of the screwing switch 14 rotates according to the screwing direction of the screwing switch 14, the second fixing sleeve 9 is stressed and the second circuit breaking bent arm 8 is rotated while the cross spindle 11 rotates, the second circuit breaking bent arm 8 is fixed with a knife switch in a first station of the circuit breaker through a second fixing bolt 10, the circuit breaking is realized in the first station, the cross spindle 11 drives the first gear 12 to rotate while rotating, the rotation of two second gears 15 which are meshed with the first gear 12 is opposite to the rotation of the two first fixing sleeves 6, the first circuit breaking bent arm 3 is rotated, the rotation is the same as that of the second circuit breaking bent arm 8, the first circuit breaking bent arm 3 is also connected with the other two stations on the circuit breaker through the first fixing bolt 4, and under the rotation action of the cross auxiliary shaft 2, the first circuit-breaking bent arm 3 breaks the other two circuit breaker stations, so that the three-station integrated circuit-breaking operation is realized.
And at the same time when the cross secondary shaft 2 and the cross main shaft 11 rotate to realize the disconnection, the first rotating shaft 17 at the end of the cross main shaft 11 is forced to rotate two first movable plates 18 under the influence of the rotation of the cross main shaft 11, the first movable plates 18 apply extrusion and rotation forces to the second movable plates 21 at both sides, and along with the extrusion to the return spring 19, when the circuit breaker is operated to close, the screw switch 14 is reversely screwed, and along with the reverse screwing action of the screw switch 14, the elastic potential energy of the return spring 19 and the extrusion forces between the first movable plates 18 and the second movable plates 21 force the first rotating shaft 17 to rapidly rotate to the original position, so as to realize the rapid closing, and the resistance formed between the return spring 19 and the first movable plates 18 and the second movable plates 21 can be obviously felt by the screwing of the screw switch 14 during the disconnection, and further the progress of the disconnection operation can be sensed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A three-station isolating switch integrated operating mechanism for a circuit breaker for a switch cabinet comprises a first side plate (1) and a second side plate (7), and is characterized in that supporting columns (16) are welded at four corners of one side, close to each other, of the first side plate (1) and the second side plate (7), wherein one ends, far away from the first side plate (1), of the supporting columns (16) penetrate through and extend to the left side of the second side plate (7), limiting panels (5) are welded at one ends, located at the left side of the second side plate (7), of the supporting columns (16), one sides, close to the second side plate (7), of the limiting panels (5) are respectively and rotatably connected with two cross auxiliary shafts (2) and one cross main shaft (11), penetrating through and extending to the right side of the second side plate (7), one ends, located at the right side of the second side plate (7), of the cross main shafts (11) and one ends, located at the right side of the second side plate (7), of the cross auxiliary shafts (2) are rotatably connected with one side, close to the second side plate (7), of the first side plate (1), the outer lane of cross countershaft (2) all welds first fixed sleeving (6), the outer lane welding of first fixed sleeving (6) has first open circuit curved arm (3), the outer lane welding of cross main shaft (11) has second fixed sleeving (9), the outer lane welding of second fixed sleeving (9) has second open circuit curved arm (8).
2. The three-position disconnecting switch integrated operating mechanism for the circuit breaker for the switch cabinet is characterized in that a second gear (15) is welded on a section of outer circle, away from the first fixed sleeve (6), of the cross auxiliary shaft (2), a first gear (12) is welded on a section of outer circle, away from the second fixed sleeve (9), of the cross main shaft (11), and the first gear (12) and the two second gears (15) are meshed with each other.
3. The three-station disconnecting switch integrated operating mechanism for the circuit breaker for the switch cabinet is characterized in that one end, away from the second fixing sleeve (9), of the second disconnecting bent arm (8) is sleeved with a second fixing bolt (10), first nuts are arranged at two ends of the second fixing bolt (10), one end, away from the first fixing sleeve (6), of the first disconnecting bent arm (3) is sleeved with a first fixing bolt (4), and second nuts are arranged at two ends of the first fixing bolt (4) in a sleeved mode.
4. The three-position disconnecting switch integrated operating mechanism for the circuit breaker for the switch cabinet is characterized in that the connection parts of the cross auxiliary shaft (2) and the cross main shaft (11) and the limiting panel (5) are respectively provided with a rotating column (13), and the rotating column (13) on the cross main shaft (11) is welded with a screwing switch (14).
5. The integrated operating mechanism of the three-position disconnecting switch of the circuit breaker for the switch cabinet as claimed in claim 1, the cross spindle is characterized in that a first rotating shaft (17) is welded at one end, located on the right side of the first side plate (1), of the cross spindle (11), two first movable plates (18) are welded at one end, away from the cross spindle (11), of the first rotating shaft (17), one end, away from the first rotating shaft (17), of each first movable plate (18) is hinged to a second movable plate (21), one end, away from the first movable plate (18), of each second movable plate (21) is hinged to a second rotating shaft (20), one end, away from the second movable plate (21), of each second rotating shaft (20) is welded with one end, close to the first side plate (1), of the cross auxiliary shaft (2), and one side, close to each other, of the first movable plates (18) and the second movable plates (21) is provided with a reset spring (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111397986.7A CN114068229B (en) | 2021-11-19 | 2021-11-19 | Three-station isolating switch integrated operating mechanism for breaker for switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111397986.7A CN114068229B (en) | 2021-11-19 | 2021-11-19 | Three-station isolating switch integrated operating mechanism for breaker for switch cabinet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114068229A true CN114068229A (en) | 2022-02-18 |
| CN114068229B CN114068229B (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111397986.7A Active CN114068229B (en) | 2021-11-19 | 2021-11-19 | Three-station isolating switch integrated operating mechanism for breaker for switch cabinet |
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| CN (1) | CN114068229B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009026578A (en) * | 2007-07-19 | 2009-02-05 | Mitsubishi Electric Corp | Device for operating three-position switch |
| CN103177901A (en) * | 2012-12-24 | 2013-06-26 | 刘晓颖 | Three-position switch operating mechanism |
| CN203179777U (en) * | 2012-12-07 | 2013-09-04 | 浙宝电气(杭州)集团有限公司 | Three-station operation mechanism |
| CN103325588A (en) * | 2013-07-01 | 2013-09-25 | 北京电研华源电力技术有限公司 | Three-station insulation earthing switch |
| CN203871254U (en) * | 2014-05-29 | 2014-10-08 | 厦门兴厦控电气有限公司 | Operating mechanism of three-station isolation switch |
| CN204441173U (en) * | 2015-03-27 | 2015-07-01 | 湖北网安科技有限公司 | A kind of two Three-Position Switch Operate Institutions |
| CN214012814U (en) * | 2021-01-12 | 2021-08-20 | 苏州兰姆达电气有限公司 | Three-station isolation grounding switch operating mechanism |
-
2021
- 2021-11-19 CN CN202111397986.7A patent/CN114068229B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009026578A (en) * | 2007-07-19 | 2009-02-05 | Mitsubishi Electric Corp | Device for operating three-position switch |
| CN203179777U (en) * | 2012-12-07 | 2013-09-04 | 浙宝电气(杭州)集团有限公司 | Three-station operation mechanism |
| CN103177901A (en) * | 2012-12-24 | 2013-06-26 | 刘晓颖 | Three-position switch operating mechanism |
| CN103325588A (en) * | 2013-07-01 | 2013-09-25 | 北京电研华源电力技术有限公司 | Three-station insulation earthing switch |
| CN203871254U (en) * | 2014-05-29 | 2014-10-08 | 厦门兴厦控电气有限公司 | Operating mechanism of three-station isolation switch |
| CN204441173U (en) * | 2015-03-27 | 2015-07-01 | 湖北网安科技有限公司 | A kind of two Three-Position Switch Operate Institutions |
| CN214012814U (en) * | 2021-01-12 | 2021-08-20 | 苏州兰姆达电气有限公司 | Three-station isolation grounding switch operating mechanism |
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| CN114068229B (en) | 2024-01-02 |
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