CN110600320A - Reverse-drive transverse permanent magnet vacuum circuit breaker - Google Patents
Reverse-drive transverse permanent magnet vacuum circuit breaker Download PDFInfo
- Publication number
- CN110600320A CN110600320A CN201910718766.6A CN201910718766A CN110600320A CN 110600320 A CN110600320 A CN 110600320A CN 201910718766 A CN201910718766 A CN 201910718766A CN 110600320 A CN110600320 A CN 110600320A
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- iron core
- permanent magnet
- circuit breaker
- vacuum circuit
- transverse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a reverse driving transverse permanent magnet vacuum circuit breaker, which comprises a transverse insulator, a transmission mechanism and a driving mechanism, wherein a moving contact in the transverse insulator is connected with the driving mechanism through the transmission mechanism; two ends of the steering plate are respectively hinged with the transverse rod and the vertical rod, the middle part of the steering plate is hinged on the transmission head, and the hinge point of the middle part of the steering plate is far away from the transverse insulator compared with the hinge point hinged with the vertical rod. The reverse driving transverse permanent magnet vacuum circuit breaker has the advantages of simplicity, practicability, compact structure, excellent electrical performance, quick and accurate opening and closing operation and the like.
Description
Technical Field
The invention relates to the field of vacuum circuit breakers, in particular to a reverse-drive transverse permanent magnet vacuum circuit breaker.
Background
The existing vacuum circuit breakers for locomotives and motor trains usually adopt a cylinder driving electromagnetic maintaining mode, dynamic performance indexes are difficult to improve by adopting cylinder driving due to the compressibility of air, pneumatic pipelines are complicated, the driving reliability of the vacuum circuit breakers is influenced by the quality of an air source provided by the locomotives and motor trains, air leakage is easy, the failure rate is increased, in addition, the sealing failure of pneumatic elements in alpine regions is also a big problem, and the problems greatly influence the reliability of product application, so the application of the permanent magnet type vacuum circuit breakers is a trend of technical development.
The traditional vertical vacuum circuit breaker is generally characterized in that a driving mechanism is directly connected with a moving contact end of an arc extinguish chamber, the structure is simple and easy to implement, fault points are few, but the voltage resistance level of a high-voltage switch is limited, the influence of the installation height of a locomotive is avoided, and the electric gap is small. In the existing horizontal vacuum circuit breaker, as shown in fig. 1, the inner space of the transmission head is mainly occupied by the steering plate which is unreasonably arranged, so that the energy storage spring component cannot be accommodated in the transmission head, and only a part of the horizontal insulator can be extended to accommodate the energy storage spring component, so that the horizontal insulator is lengthened, the probability that the horizontal insulator is damaged by aerodynamic force is increased, and the manufacturing and maintenance costs are increased.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a reverse driving transverse permanent magnet vacuum circuit breaker which is simple and practical, has a compact structure, excellent electrical performance and quick and accurate opening and closing operation.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a reverse drive horizontal permanent magnet vacuum circuit breaker comprises a horizontal insulator, a transmission mechanism and a driving mechanism, wherein a moving contact in the horizontal insulator is connected with the driving mechanism through the transmission mechanism, and the transmission mechanism comprises a steering plate, a transverse rod connected with the moving contact through an energy storage spring component, a vertical rod connected with the driving mechanism and a transmission head which covers the steering plate and the energy storage spring component and is connected with the horizontal insulator; two ends of the steering plate are respectively hinged with the transverse rod and the vertical rod, the middle part of the steering plate is hinged on the transmission head, and the hinge point of the middle part of the steering plate is far away from the transverse insulator compared with the hinge point hinged with the vertical rod.
As a further improvement of the above technical solution:
the transverse rod comprises a rod body and a guide head which are hinged with each other, the rod body is hinged with the steering plate, the guide head is connected with the moving contact through an energy storage spring component, a transverse guide groove is formed in the transmission head, and the guide head connected with the energy storage spring component is arranged in the transverse guide groove and moves back and forth along the transverse guide groove.
The transmission head is provided with a vertical guide hole, and the vertical rod penetrates through the vertical guide hole and reciprocates along the axial direction of the vertical rod; the hinge hole of the steering plate connected with the vertical rod is a strip-shaped hole with a long axis vertical to the vertical guide hole.
The driving mechanism comprises a shell and a driving shaft connected with the vertical rod, the driving shaft penetrates through a through hole formed in the two end faces of the shell and can move along the axial direction to drive the vertical rod, a fixed adsorption piece is arranged on one end face in the shell, a movable iron core is arranged on the driving shaft, and an elastic piece is arranged between the inner wall of the end face of the shell provided with the fixed adsorption piece and the movable iron core.
Decide and adsorb the piece and decide the iron core including first certain iron core, permanent magnetism steel, coil and second, first certain iron core is for having the platelike structure who allows the through-hole that the drive shaft passed, the peripheral face dress of first certain iron core is equipped with the permanent magnetism steel, the bottom surface of first certain iron core and the terminal surface inner wall fixed connection of shell, top surface and coil fixed connection, the second is decided the iron core and is enclosed in the periphery of permanent magnetism steel and coil.
The inner surrounding surface of the coil and the top surface of the first fixed iron core are surrounded to form an accommodating area, the movable iron core enters or departs from the accommodating area along with the movement of the driving shaft, and the depth of the accommodating area is not less than the movement travel distance of the driving shaft.
And a protruding step is arranged on the outer side of the top end of the movable iron core, and the movable iron core enters the accommodating area along with the movement of the driving shaft and is attached to the top surface of the second fixed iron core through the step.
The elastic part is a spring wound on the periphery of the driving shaft, one end of the spring is fixedly connected with the inner wall of the end face of the shell, and the other end of the spring is supported on the movable iron core.
The bottom of drive shaft is equipped with first through-hole, be equipped with the manual divide-shut brake supporting shoe of the bottom surface of a perpendicular to shell on the bottom surface of shell, be equipped with the second through-hole on the manual divide-shut brake supporting shoe, the axis of second through-hole is parallel with the axis of first through-hole, and is perpendicular with the axis of drive shaft.
And the shell is provided with a gasket on the inner wall of the end surface opposite to the movable iron core.
Compared with the prior art, the invention has the advantages that:
the invention provides a reverse driving transverse permanent magnet vacuum circuit breaker, wherein a moving contact of the reverse driving transverse permanent magnet vacuum circuit breaker is connected with a driving mechanism through a transmission mechanism, the transmission mechanism comprises a steering plate, a transverse rod connected with the moving contact through an energy storage spring component and a vertical rod connected with the driving mechanism, two ends of the steering plate are respectively hinged with the transverse rod and the vertical rod, the middle part of the steering plate is hinged on a transmission head, and a hinge point in the middle part of the steering plate is far away from a transverse insulator compared with a hinge point hinged with the vertical rod. When the opening operation is carried out, the driving mechanism jacks the vertical rod to enable the steering plate to rotate around a hinge point on the shell to drive the transverse rod to move so as to enable the moving contact and the static contact to be separated; when the switch is switched on, the vertical rod is pulled down by the driving mechanism to enable the steering plate to rotate around a hinge point on the shell to drive the transverse rod to move so as to enable the movable contact to be in contact with the fixed contact.
The steering plate motion center of the reverse driving transverse permanent magnet vacuum circuit breaker is positioned at the rear part of the transmission head, and the steering plate motion center occupies small space inside the transmission head, so that the energy storage spring component can be directly arranged inside the transmission head, the length of the transverse insulator is effectively reduced, the probability of the transverse insulator being damaged by aerodynamic force is reduced, and the manufacturing and maintenance cost is also reduced. And the overall occupied space of the vacuum circuit breaker is reduced, and the layout can be reasonably carried out on the premise of ensuring various high-voltage electrical performance parameters and functional indexes, so that good comprehensive performance is obtained.
Drawings
Fig. 1 is a schematic view of an internal structure of a transmission head of a conventional horizontal permanent magnet vacuum circuit breaker;
fig. 2 is a schematic structural view of a reverse driving horizontal permanent magnet vacuum circuit breaker according to the present invention;
fig. 3 is a schematic structural diagram of a driving mechanism in the reverse driving horizontal permanent magnet vacuum circuit breaker according to the present invention.
Illustration of the drawings: 1. a transverse insulator; 2. a transmission mechanism; 21. a steering plate; 22. a transverse bar; 221. a shaft body; 222. a guide head; 23. a vertical rod; 24. a drive head; 3. a drive mechanism; 31. a housing; 311. a first fixed iron core; 312. permanent magnet steel; 313. a coil; 314. a second stationary core; 315. a manual opening and closing brake supporting block; 3151. a second through hole; 32. a drive shaft; 321. a movable iron core; 322. a first through hole; 33. an elastic member.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Example (b):
as shown in fig. 2, the reverse driving horizontal permanent magnet vacuum circuit breaker of this embodiment includes a horizontal insulator 1, a transmission mechanism 2 and a driving mechanism 3, a moving contact in the horizontal insulator 1 is connected to the driving mechanism 3 through the transmission mechanism 2, the transmission mechanism 2 includes a steering plate 21, a horizontal rod 22 connected to the moving contact through an energy storage spring component, a vertical rod 23 connected to the driving mechanism 3, and a transmission head 24 covering the steering plate 21 and the energy storage spring component and connected to the horizontal insulator 1; two ends of the steering plate 21 are respectively hinged with the transverse rod 22 and the vertical rod 23, the middle part of the steering plate is hinged on the transmission head 24, and the hinged point of the middle part of the steering plate 21 is far away from the transverse insulator 1 compared with the hinged point hinged with the vertical rod 23.
When the reverse driving transverse permanent magnet vacuum circuit breaker is opened, the driving mechanism 3 jacks the vertical rod 23 to enable the steering plate 21 to rotate around a hinge point on the transmission head 24 to drive the transverse rod 22 to move so as to enable the moving contact and the static contact to be separated; when the switch is switched on, the vertical rod 23 is pulled down by the driving mechanism 3 to enable the steering plate 21 to rotate around a hinge point on the transmission head 24 to drive the transverse rod 22 to move so as to enable the movable contact to be in contact with the fixed contact. The motion center of the steering plate 21 is positioned at the rear part of the transmission head 24, and the limited space in the transmission head 24 is utilized to the maximum extent, so that the energy storage spring component can be directly arranged in the transmission head 24, the length of the transverse insulator 1 is effectively reduced, the probability that the transverse insulator 1 is damaged by aerodynamic force is reduced, and the manufacturing and maintenance cost is also reduced. And the overall occupied space of the vacuum circuit breaker is reduced, and the layout can be reasonably carried out on the premise of ensuring various high-voltage electrical performance parameters and functional indexes, so that good comprehensive performance is obtained.
In this embodiment, the transverse rod 22 includes a rod 221 and a guide head 222 hinged to each other, the rod 221 is hinged to the steering plate 21, the guide head 222 is connected to the movable contact through an energy storage spring member, the transmission head 24 is provided with a transverse guide slot, and the guide head 222 connected to the energy storage spring member is disposed in the transverse guide slot and reciprocates along the transverse guide slot. The transverse guide groove limits the moving direction of the guide head 222, so that the moving contact can move along the horizontal direction all the time, the position accuracy during closing is ensured, the influence of lateral force on the moving contact is eliminated, the friction between the moving contact and the inner wall of the transverse insulator 1 is avoided, and the service life of the vacuum arc extinguisher is prolonged.
In this embodiment, the transmission head 24 is provided with a vertical guide hole, and the vertical rod 23 is inserted into the vertical guide hole and reciprocates along the axial direction thereof; similar to the above, the vertical guide hole limits the moving direction of the vertical rod 23, eliminates the influence of lateral force on the vertical rod 23, avoids the friction between the vertical rod 23 and the inner wall of the transmission head 24, and prolongs the service life of the vacuum arc extinguisher. The hinge hole of the steering plate 21 connected with the vertical rod 23 is a strip-shaped hole with a long axis vertical to the vertical guide hole, so that the situation that the vertical rod 23 is difficult to move and even is blocked due to the fact that the hinge hole generates transverse displacement in the rotation process of the steering plate 21 is prevented.
In this embodiment, as shown in fig. 3, the driving mechanism 3 includes a housing 31 and a driving shaft 32 connected to the vertical rod 23, the driving shaft 32 penetrates through holes formed in two end surfaces of the housing 31 and can move in the axial direction to drive the vertical rod 23, the arrangement of the closed housing 31 can prevent dust particles from entering the mechanism, prevent the driving shaft 32 from being worn and difficult to move in the movement process, and improve the integrity of the mechanism itself to prevent parts from falling off.
A fixed adsorption part is arranged on one end surface in the shell 31, a movable iron core 321 is arranged on the driving shaft 32, and an elastic part 33 is arranged between the inner wall of the end surface of the shell 31 provided with the fixed adsorption part and the movable iron core 321. The fixed adsorption piece and the movable iron core 321 are adsorbed to be attached or the fixed adsorption piece and the movable iron core 321 are propped by the elastic piece 33, so that the opening and closing operation of the mechanism can be realized. The device is simple and convenient to operate, simple in structure, very suitable for the rail transit fields of high-speed rails, motor train units, electric locomotives, subways and the like, and also capable of being expanded and applied to the power industry.
In this embodiment, the fixed adsorbing member includes a first fixed iron core 311, a permanent magnetic steel 312, a coil 313 and a second fixed iron core 314, the first fixed iron core 311 is a plate-shaped structure with a through hole allowing the driving shaft 32 to pass through, the permanent magnetic steel 312 is installed on the peripheral surface of the first fixed iron core 311, the bottom surface of the first fixed iron core 311 is fixedly connected with the inner wall of the end surface of the housing 31, the top surface of the first fixed iron core is fixedly connected with the coil 313, and the second fixed iron core 314 surrounds the peripheries of the permanent magnetic steel 312 and the coil 313.
When in adsorption, the coil 313 is electrified with positive current to lead the generated electromagnetic field to be superposed with the permanent magnetic field of the permanent magnetic steel 312 in the same direction, so that the movable iron core 321 and the fixed adsorption part are adsorbed and attached together, and then the coil 313 is not electrified any more and only needs to be kept by the permanent magnetic steel 312; when separation is needed, reverse current is conducted in the coil 313 to enable the generated electromagnetic field to be reversely offset with the permanent magnetic field of the permanent magnetic steel 312, so that the movable iron core 321 is separated from the fixed adsorption part under the action of the elastic part 33, an air gap is formed between the fixed adsorption part and the fixed adsorption part, the adsorption action of the permanent magnetic steel 312 on the movable iron core 321 is rapidly weakened to a useless degree, then the coil 313 does not need to be electrified any more, and the separation can be carried out only by the elastic part 33. The embodiment combines the electric permanent magnet for application, and only the switch-on and switch-off are carried out instantly, so that a large amount of electric energy is saved, and the safety performance in the use process is improved.
In this embodiment, the inner surface of the coil 313 and the top surface of the first fixed iron core 311 are enclosed to form an accommodation area, and the movable iron core 321 enters or departs from the accommodation area along with the movement of the driving shaft 32, so that the stability of the opening and closing state is further ensured by the snap-in opening and closing mode, the use performance and the effect of the mechanism are improved, the depth of the accommodation area is not less than the movement travel distance of the driving shaft 32, and the movement of the driving shaft 32 is not interfered.
In this embodiment, the top outer side of the movable iron core 321 is provided with a protruding step, and the movable iron core 321 enters the accommodating area along with the movement of the driving shaft 32, and the back step is attached to the top surface of the second fixed iron core 314, so as to play a role of limiting, and meanwhile, the adsorption area is also enlarged, which is helpful to ensure the stability of the opening and closing state.
In this embodiment, the elastic element 33 is a spring wound around the driving shaft 32 to provide a uniform and stable elastic force, one end of the spring is fixedly connected to the inner wall of the end face of the housing 31, and the other end of the spring is supported on the movable iron core 321.
In this embodiment, the bottom end of the driving shaft 32 is provided with a first through hole 322, the bottom surface of the housing 31 is provided with a manual opening and closing support block 315 perpendicular to the bottom surface of the housing 31, the manual opening and closing support block 315 is provided with a second through hole 3151, and an axis of the second through hole 3151 is parallel to an axis of the first through hole 322 and perpendicular to an axis of the driving shaft 32. When the switching operation of switching on and switching off can not be realized after the electrification, an operator can take a crowbar-like rod-shaped object to pass through the second through hole 3151 and the first through hole 322, then the lever principle is utilized to carry out manual switching on and switching off operation, the dangerous fault condition is prevented from occurring when the mechanism fails, and the safety performance of the mechanism is further improved.
In this embodiment, the housing 31 is provided with a spacer on the inner wall of the end face opposite to the movable iron core 321 to buffer the collision force when the movable iron core 321 moves, thereby prolonging the service life of the mechanism.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. It should be apparent to those skilled in the art that modifications and variations can be made without departing from the technical spirit of the present invention.
Claims (10)
1. The utility model provides a horizontal formula permanent magnetism vacuum circuit breaker of reverse drive, includes horizontal insulator (1), drive mechanism (2) and actuating mechanism (3), links to each other its characterized in that through drive mechanism (2) between moving contact in horizontal insulator (1) and actuating mechanism (3): the transmission mechanism (2) comprises a steering plate (21), a transverse rod (22) connected with the movable contact through an energy storage spring component, a vertical rod (23) connected with the driving mechanism (3), and a transmission head (24) which is covered outside the steering plate (21) and the energy storage spring component and connected with the transverse insulator (1); two ends of the steering plate (21) are respectively hinged with the transverse rod (22) and the vertical rod (23), the middle part of the steering plate is hinged on the transmission head (24), and the hinged point of the middle part of the steering plate (21) is far away from the transverse insulator (1) compared with the hinged point hinged with the vertical rod (23).
2. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 1, wherein: the transverse rod (22) comprises a rod body (221) and a guide head (222) which are hinged with each other, the rod body (221) is hinged with the steering plate (21), the guide head (222) is connected with the movable contact through an energy storage spring component, a transverse guide groove is formed in the transmission head (24), and the guide head (222) connected with the energy storage spring component is arranged in the transverse guide groove and moves back and forth along the transverse guide groove.
3. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 1, wherein: the transmission head (24) is provided with a vertical guide hole, and the vertical rod (23) penetrates through the vertical guide hole and moves in a reciprocating manner along the axial direction of the vertical rod; the hinge hole of the steering plate (21) connected with the vertical rod (23) is a strip-shaped hole with a long axis vertical to the vertical guide hole.
4. The reverse driving horizontal type permanent magnet vacuum circuit breaker according to any one of claims 1 to 3, wherein: actuating mechanism (3) include shell (31) and drive shaft (32) that are connected with vertical pole (23), drive shaft (32) wear to locate in the through-hole that shell (31) both ends face was seted up to can follow axial displacement in order to drive vertical pole (23), be equipped with on the terminal surface in shell (31) and decide the absorption piece, be equipped with on drive shaft (32) and move iron core (321), the top is equipped with elastic component (33) between the terminal surface inner wall of shell (31) and the movable iron core (321) that are equipped with and decide the absorption piece.
5. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 4, wherein: decide the adsorption member and include first certain iron core (311), permanent magnet steel (312), coil (313) and second and decide iron core (314), first certain iron core (311) are for having the platelike structure who allows drive shaft (32) to pass, the peripheral face dress of first certain iron core (311) is equipped with permanent magnet steel (312), the bottom surface of first certain iron core (311) and the terminal surface inner wall fixed connection of shell (31), top surface and coil (313) fixed connection, second is decided iron core (314) and encloses the periphery of locating permanent magnet steel (312) and coil (313).
6. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 5, wherein: the inner peripheral surface of the coil (313) and the top surface of the first fixed iron core (311) are enclosed to form an accommodating area, the movable iron core (321) enters or departs from the accommodating area along with the movement of the driving shaft (32), and the depth of the accommodating area is not less than the movement stroke distance of the driving shaft (32).
7. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 6, wherein: the outer side of the top end of the movable iron core (321) is provided with a protruding step, and the movable iron core (321) enters the accommodating area along with the movement of the driving shaft (32) and the back step is attached to the top surface of the second fixed iron core (314).
8. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 4, wherein: the elastic piece (33) is a spring wound on the periphery of the driving shaft (32), one end of the spring is fixedly connected with the inner wall of the end face of the shell (31), and the other end of the spring is supported on the movable iron core (321).
9. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 4, wherein: the bottom end of the driving shaft (32) is provided with a first through hole (322), the bottom surface of the shell (31) is provided with a manual opening and closing brake supporting block (315) perpendicular to the bottom surface of the shell (31), the manual opening and closing brake supporting block (315) is provided with a second through hole (3151), and the axis of the second through hole (3151) is parallel to the axis of the first through hole (322) and perpendicular to the axis of the driving shaft (32).
10. The reverse drive horizontal permanent magnet vacuum circuit breaker according to claim 4, wherein: and the shell (31) is provided with a gasket on the inner wall of the end surface opposite to the movable iron core (321).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910718766.6A CN110600320B (en) | 2019-08-05 | 2019-08-05 | Reverse-drive transverse permanent magnet vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910718766.6A CN110600320B (en) | 2019-08-05 | 2019-08-05 | Reverse-drive transverse permanent magnet vacuum circuit breaker |
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| Publication Number | Publication Date |
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| CN110600320A true CN110600320A (en) | 2019-12-20 |
| CN110600320B CN110600320B (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910718766.6A Active CN110600320B (en) | 2019-08-05 | 2019-08-05 | Reverse-drive transverse permanent magnet vacuum circuit breaker |
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| CN203950733U (en) * | 2014-06-26 | 2014-11-19 | 西一电气有限公司 | A kind of side-mounted high-pressure vacuum breaker |
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| CN205230938U (en) * | 2015-12-21 | 2016-05-11 | 北京赛德高科铁道电气科技有限责任公司 | A wedge type turns to device and vacuum circuit breaker for vacuum circuit breaker |
| CN205428820U (en) * | 2015-12-17 | 2016-08-03 | 北京赛德高科铁道电气科技有限责任公司 | Husky vacuum circuit breaker of anti high and cold anti -wind |
| CN109859983A (en) * | 2018-12-29 | 2019-06-07 | 国网河南省电力公司新乡供电公司 | A kind of 10 KV hot-line work arc-extinction devices |
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2019
- 2019-08-05 CN CN201910718766.6A patent/CN110600320B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201383467Y (en) * | 2009-02-19 | 2010-01-13 | 陕西中恒电气有限公司 | Monostable and monocoil permanent magnetic mechanism |
| CN201374280Y (en) * | 2009-03-30 | 2009-12-30 | 常州市明及电气技术开发有限公司 | Four-bar mechanism of horizontal vacuum breaker |
| CN203950733U (en) * | 2014-06-26 | 2014-11-19 | 西一电气有限公司 | A kind of side-mounted high-pressure vacuum breaker |
| CN205428820U (en) * | 2015-12-17 | 2016-08-03 | 北京赛德高科铁道电气科技有限责任公司 | Husky vacuum circuit breaker of anti high and cold anti -wind |
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| Publication number | Publication date |
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| CN110600320B (en) | 2022-08-09 |
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