Quick switch based on three magnetic control mechanisms and action method

Abstract

The invention relates to the technical field of medium-high voltage switches, in particular to a high-speed switch based on three magnetic control mechanisms and an operation method.The high-speed switch comprises a switch body, the three magnetic control mechanisms are arranged at the upper end of the switch body and correspondingly matched with an A-phase circuit, a B-phase circuit and a C-phase circuit respectively, and each magnetic control mechanism comprises a driving part, a transmission part and a shell; an insulation support is arranged on the inner side of the switch body, a vacuum arc-extinguishing chamber is arranged at the upper end of the insulation support, a static contact and a moving contact are arranged in an inner cavity in the vacuum arc-extinguishing chamber, and an isolation assembly is arranged at the lower end of the vacuum arc-extinguishing chamber. A three-phase power supply scene of the power system is adapted; the magnetic control mechanism can quickly drive the vacuum arc-extinguishing chamber to act by means of the synergistic effect of the driving part and the transmission part, the effect of completing circuit breaking within 5ms is achieved, and fault current can be quickly cut off.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medium and high voltage switch, in particular to a fast switch based on three magnetic control mechanisms and an operation method. BACKGROUND

[0002] In the current power system, the medium and high voltage switch as the core control and protection equipment directly affects the system operation stability and equipment safety, but the existing technology still has many shortcomings, which is difficult to meet the efficient and safe operation demand.

[0003] Firstly, the existing switch adopts a single driving mechanism to link ABC three-phase contacts through a connecting rod, which is easy to cause three-phase action out of synchronization due to transmission chain deformation and component wear, causing phase deviation or on-off delay, which not only affects the power supply quality of the power system, but also may cause impact on sensitive equipment such as frequency converter and transformer, secondly, in terms of driving mode, the traditional mechanical transmission mechanism has long transmission chain and large inertia, so the opening time is generally long, which cannot complete the cut-off in a very short time when the fault current occurs, which is easy to cause fault diffusion and cause equipment burning or more serious system accidents, so a targeted technical solution is needed to solve the above problems, therefore we propose a fast switch based on three magnetic control mechanisms. SUMMARY

[0004] In view of the above or the problems existing in the prior art, the present application is proposed.

[0005] Therefore, the purpose of the present application is to provide a fast switch based on three magnetic control mechanisms.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a switch body is provided, three magnetic control mechanisms are arranged at the upper end of the switch body, the three magnetic control mechanisms are respectively adapted to ABC three-phase circuits, the magnetic control mechanism comprises a driving part, a transmission part and a shell, an insulating support is arranged at the inner side of the switch body, a vacuum arc-extinguishing chamber is arranged at the upper end of the insulating support, static contacts and moving contacts are respectively arranged in the inner cavity of the vacuum arc-extinguishing chamber, an isolation assembly is arranged at the lower end of the vacuum arc-extinguishing chamber, the isolation assembly comprises a contact knife rotating shaft arranged below the switch body, an isolation contact knife is arranged at the upper end of the contact knife rotating shaft, an isolation contact is arranged on one side of the isolation contact knife, the isolation contact is connected with the static contact of the vacuum arc-extinguishing chamber, and the contact knife rotating shaft is used to drive the isolation contact knife to act to realize the isolation switch together with the isolation contact.

[0007] As a preferred scheme of the fast switch based on three magnetic control mechanisms of the present application, the driving part is composed of an electromagnetic coil and a core, the electromagnetic coil and the core are arranged in the middle part of the inner cavity of the shell, the electromagnetic coil is arranged on the outer side of the core, and the moving contact of the vacuum arc-extinguishing chamber is driven to realize the fast on-off of the circuit.

[0008] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, the transmission part comprises an insulating pull rod and a connecting pull rod, two ends of the connecting pull rod are connected with the magnetic control mechanism and the insulating pull rod respectively, one end of the insulating pull rod away from the connecting pull rod is connected with the moving contact of the vacuum arc-extinguishing chamber, a spring is arranged in the insulating pull rod, and the spring is used for transmitting a pulling force, guaranteeing the contact pressure of the vacuum arc-extinguishing chamber and inhibiting the contact bounce, and the spring is an overtravel spring.

[0009] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, a adjusting nut is arranged below the connecting pull rod, a clamping groove is formed in the adjusting nut, a hexagonal opening and closing shaft is arranged, and six driving arms are arranged on the opening and closing shaft, and the six driving arms are clamped into the clamping grooves of the adjusting nut.

[0010] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, the sliding surface of the moving contact is treated by a diamond-like carbon (DLC) coating, the static contact, the moving contact, the isolation contact and the isolation contact knife are all made of red copper T2 material, and the static contact, the moving contact, the isolation contact and the isolation contact knife have cyanide bright silver plating layers.

[0011] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, the insulating support is made of high-strength sheet molding compound (SMC composite material), and the insulating support is arranged in the middle of the switch body.

[0012] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, the switch body is provided with a first fixed plate and a second fixed plate on two sides respectively, and the first fixed plate has the same size as the second fixed plate.

[0013] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, the vacuum arc-extinguishing chamber is provided with a connecting seat on each side, and the connecting seat corresponds to the insulating pull rod one by one.

[0014] As a preferred scheme of the fast switch based on the three magnetic control mechanisms of the application, the lower end of the switch body is provided with an insulating cross beam, two ends of the insulating cross beam are detachably connected with the lower ends of the first fixed plate and the second fixed plate respectively, and the contact knife rotating shaft is arranged above the insulating cross beam.

[0015] The contact surface of the static contact, the moving contact, the isolation contact and the isolation contact knife has a cyanide bright silver plating layer, so as to improve the corrosion resistance and the conductivity.

[0016] The isolation assembly at the lower end of the vacuum arc-extinguishing chamber drives the isolation contact knife to move through the contact knife rotating shaft, the contact knife rotating shaft drives the isolation contact knife to separate from the isolation contact, and physical isolation of the circuit is realized.

[0017] The operation method of the quick switch of the three magnetic control mechanisms is as follows:

[0018] Under normal working conditions, the switch is turned on and off depending on the magnetic control mechanism, when the switch is closed, the magnetic control mechanism is attracted to drive the connecting pull rod and the insulating pull rod to operate, the adjusting nut moves synchronously with the connecting pull rod, when the switch is opened, the magnetic control mechanism is demagnetized, the spring pulls the parts back to the original position, and the adjusting nut returns to the original position with the connecting pull rod, when the magnetic control mechanism fails, the hexagonal opening shaft and the adjusting nut are matched to realize manual opening: rotate the hexagonal opening shaft, the six driving arms on the hexagonal opening shaft rotate synchronously, because the driving arms are clamped in the adjusting nut slot, the adjusting nut will move upward during the rotation process; the adjusting nut pulls the connecting pull rod and the insulating pull rod synchronously, and finally drives the moving contact and the static contact of the vacuum arc chamber to separate, and the manual opening is completed.

[0019] The quick switch based on the three magnetic control mechanisms has the following advantages: the three magnetic control mechanisms are matched with the ABC three-phase circuit one by one, the independent on-off control of the three-phase circuit can be realized, and the three-phase power supply scene of the power system can be matched; the magnetic control mechanism can quickly drive the vacuum arc chamber to operate by the cooperation of the driving part and the transmission part, the circuit breaking can be completed within 5 ms, and the fault current can be quickly cut off; the insulating support is made of high-strength sheet molding compound (SMC composite material), which can stably fix the vacuum arc chamber and meet the high insulation performance requirement; the isolation assembly drives the isolation contact to cooperate with the isolation contact through the contact knife shaft, realizes the circuit isolation protection, further improves the operation safety of the power system, and reduces the risk of fault expansion. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 It is a whole schematic view of the switch body of the quick switch based on the three magnetic control mechanisms.

[0022] Figure 2 It is a front view structural schematic view of the switch body of the quick switch based on the three magnetic control mechanisms.

[0023] Figure 3 It is a rear view structural schematic view of the switch body of the quick switch based on the three magnetic control mechanisms.

[0024] Figure 4 It is a local enlarged view of A in the quick switch based on the three magnetic control mechanisms. Figure 3 ​

[0025] Figure 5 The side view structure diagram of the switch body of the fast switch based on three magnetic control mechanisms.

[0026] Figure 6 The top view structure diagram of the switch body of the fast switch based on three magnetic control mechanisms.

[0027] Figure 7 The internal structure diagram of the magnetic control mechanism of the fast switch based on three magnetic control mechanisms.

[0028] Figure 8 The internal structure diagram of the insulating support of the fast switch based on three magnetic control mechanisms.

[0029] Label: 100, switch body; 101, magnetic control mechanism; 102, opening and closing rotating shaft; 103, insulating pull rod; 104, vacuum arc-extinguishing chamber; 105, insulating support; 106, first fixed plate; 107, second fixed plate; 108, contact knife rotating shaft; 109, connecting pull rod; 110, adjusting nut; 111, driving support arm; 112, connecting seat; 113, isolation contact; 114, isolation contact knife; 115, insulating crossbeam; 101a, shell; 101b, iron core; 101c, electromagnetic coil; 110a, clamping groove; 105a, moving contact; 105b, stationary contact. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0031] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0032] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or selective embodiment mutually exclusive with other embodiments.

[0033] REFERENCE Figures 1 to 8The utility model provides a kind of fast switch based on three magnetic control mechanisms, it includes switch body 100, the upper end of switch body 100 is provided with three magnetic control mechanisms 101, three magnetic control mechanisms 101 are respectively corresponding adaptation with ABC three-phase circuit, magnetic control mechanism 101 includes drive part, transmission part and shell 101a, the inside of switch body 100 is provided with insulating support 105, the upper end of insulating support 105 is provided with vacuum interrupter 104, the inner cavity in vacuum interrupter 104 is provided with static contact 105b and moving contact 105a respectively, the lower end of vacuum interrupter 104 is provided with isolation assembly, isolation assembly includes contact blade rotating shaft 108 being arranged below switch body 100, the upper end of contact blade rotating shaft 108 is provided with isolation contactor 114, one side of isolation contactor 114 is provided with isolation contact 113, isolation contact 113 is connected with static contact 105b of vacuum interrupter 104, contact blade rotating shaft 108 is used to drive isolation contactor 114 to act to realize isolating switch with isolation contact 113.

[0034] In the embodiment, by the design that three magnetic control mechanisms 101 are one-to-one adapted with ABC three-phase circuit, independent control of three-phase circuit is realized, when circuit needs to be closed, positive current is injected to the drive part of magnetic control mechanism 101, the drive force is generated in the drive part and is transmitted to vacuum interrupter 104 through transmission part, moving contact 105a in the arc extinguishing chamber is driven to move towards static contact 105b until the two are contacted to realize circuit conduction; after conduction, magnetic control mechanism 101 is permanent magnetic material after excitation, the magnetic force line is closed, and no continuous power supply is needed to keep the attraction state, when fault current is detected or needs to be opened, reverse small current is injected to magnetic control mechanism 101 to demagnetize it, the circuit breaker is quickly pulled by the built-in spring to separate moving contact 105a and static contact 105b, combined with the arc extinguishing capability of vacuum interrupter 104, the circuit breaking operation is completed within 5ms, and the insulating support 105 is made of high-strength SMC composite material, which has high insulation performance and mechanical strength, and can stably fix vacuum interrupter 104 to avoid the deviation of arc extinguishing chamber due to vibration or external force; the isolation assembly at the lower end of vacuum interrupter 104 drives isolation contactor 114 to act through contact blade rotating shaft 108, when the arc extinguishing chamber is broken, contact blade rotating shaft 108 drives isolation contactor 114 to separate from isolation contact 113, to realize physical isolation of circuit, prevent the risk of electric shock during subsequent maintenance or fault handling, and meet the safe operation requirements in the three-phase power supply scene of power system.

[0035] Specifically, the driving part is composed of the electromagnetic coil 101c and the core 101b, and the electromagnetic coil 101c and the core 101b are arranged in the middle part of the inner cavity of the shell 101a, the electromagnetic coil 101c is arranged outside the core 101b, and the dynamic contact 105a of the vacuum arc-extinguishing chamber 104 is driven to realize the fast on-off of the circuit, the transmission part includes the insulating pull rod 103 and the connecting pull rod 109, the two ends of the connecting pull rod 109 are respectively connected with the magnetic control mechanism 101 and the insulating pull rod 103, the end of the insulating pull rod 103 away from the connecting pull rod 109 is connected with the dynamic contact 105a of the vacuum arc-extinguishing chamber 104, and the insulating pull rod 103 is internally provided with an over-travel spring, which is used for transmitting the pulling force, guaranteeing the contact pressure of the vacuum arc-extinguishing chamber 104 and inhibiting the bounce of the contact.

[0036] In the embodiment, when closing, the electromagnetic coil 101c is injected with a forward current, the magnetic field generated by the current rapidly excites the core 101b, the core 101b after excitation has permanent magnetism and generates sufficient driving force; the driving force is transmitted to the dynamic contact 105a of the vacuum arc-extinguishing chamber 104 through the transmission part, and the dynamic contact 105a is pushed to quickly contact the static contact 105b, and the circuit is turned on; after the circuit is turned on, the magnetic force line is closed due to the excitation of the core 101b, and the magnetic control mechanism 101 remains in the attracted state, so that the circuit is not released even if the coil loses power, thereby avoiding the mis-trip caused by the loss of power; when opening, only a small reverse current is injected into the electromagnetic coil 101c, the reverse current demagnetizes the core 101b (the core 101b becomes non-magnetic material after demagnetization), the magnetic control mechanism 101 loses the attraction force, the built-in spring of the circuit breaker pulls the dynamic contact 105a and the static contact 105b to separate, the circuit is broken, and the effect of quickly cutting off the fault current is achieved; the transmission part is connected with the magnetic control mechanism 101 and the insulating pull rod 103 through the two ends of the connecting pull rod 109, the driving force generated by the magnetic control mechanism 101 is first transmitted to the connecting pull rod 109, then transmitted to the insulating pull rod 103 through the connecting pull rod 109, and finally the dynamic contact 105a of the vacuum arc-extinguishing chamber 104 is driven to move by the insulating pull rod 103, so as to realize the on-off of the circuit, guarantee the efficient and lossless transmission of the driving force, and compensate the error of the dynamic and static contacts 105b when contacting by using the spring elasticity while transmitting the pulling force; the spring pre-pressure can effectively guarantee the contact pressure of the arc-extinguishing chamber, ensure the close contact of the dynamic and static contacts 105b, and reduce the contact resistance; the impact energy can be absorbed at the moment of contact closure, the bounce of the contact can be inhibited, and the instantaneous flow breakage or arc ablation caused by the bounce can be avoided.

[0037] Further, the adjusting nut 110 is arranged below the connecting pull rod 109, the adjusting nut 110 is provided with the clamping groove 110a, the opening shaft 102 is a hexagonal opening shaft, the opening shaft 102 is provided with six driving arms 111, and the six driving arms 111 are respectively clamped into the clamping grooves 110a of the adjusting nut 110.

[0038] In the embodiment, under normal working condition, the switch is turned on and off by the magnetic control mechanism 101. When the switch is closed, the magnetic control mechanism 101 is attracted to drive the connecting pull rod 109 and the insulating pull rod 103 to move, and the adjusting nut 110 moves synchronously with the connecting pull rod 109. When the switch is opened, the magnetic control mechanism 101 is demagnetized, the spring pulling part is reset, and the adjusting nut 110 returns to the initial position with the connecting pull rod 109. When the magnetic control mechanism 101 fails, the manual opening is realized by the cooperation of the hexagonal opening shaft 102 and the adjusting nut 110. The hexagonal opening shaft 102 is rotated, and the six driving arms 111 on the hexagonal opening shaft are synchronously rotated. Because the driving arms 111 are clamped in the adjusting nut 110, the adjusting nut 110 is pulled up during the rotation process. The connecting pull rod 109 and the insulating pull rod 103 are pulled up synchronously, and finally the moving contact 105a of the vacuum arc-extinguishing chamber 104 and the static contact 105b are separated, and the manual opening is completed.

[0039] In the embodiment, the sliding surface of the moving contact 105a is coated with a diamond-like carbon (DLC) film, the static contact 105b, the moving contact 105a, the isolation contact 113, and the isolation contact knife 114 are made of red copper T2, the surfaces of the static contact 105b, the moving contact 105a, the isolation contact 113, and the isolation contact knife 114 are plated with silver, and the insulating support 105 is made of high-strength sheet molding compound (SMC composite material) and is arranged in the middle of the switch body 100.

[0040] In the embodiment, the red copper T2 has the characteristics of good electrical conductivity and high thermal conductivity, which can reduce current transmission loss when the current passes through, and quickly discharge the heat generated by contact at the same time, avoiding the burning of the contact due to overheating. The hardness of more than 110 HB caused by cold extrusion forming can improve the mechanical wear resistance of the contact and prolong the service life. Since the electrical conductivity of silver is better than that of red copper, and it has good oxidation resistance, it can reduce the generation of the oxidation layer on the surface of the contact and reduce the contact resistance, ensuring stable transmission of the current. The DLC coating on the sliding surface of the moving contact 105a has excellent wear resistance and self-lubricity, which can reduce the friction loss between the contact and the inner wall of the arc-extinguishing chamber during frequent sliding of the moving contact 105a, avoid the displacement or poor contact of the contact due to wear, and ensure the long-term stable operation of the switch. The insulating support 105 is made of high-strength SMC composite material, which can effectively isolate the high-voltage end of the vacuum arc-extinguishing chamber 104 from the grounding end of the switch body 100, prevent high-voltage leakage, avoid electric shock or short circuit failure caused by insulation failure, stably bear the weight of the vacuum arc-extinguishing chamber 104, resist mechanical vibration, external impact and other disturbances during the operation of the power system, and prevent displacement of the arc-extinguishing chamber.

[0041] It is worth noting that the DLC is a functional coating material with high hardness and low friction coefficient. By coating the moving contact sliding surface with DLC, the hardness of the sliding surface is significantly improved, the wear resistance is enhanced, and the mechanical wear caused by frequent opening and closing of the switch is resisted.

[0042] Preferably, the first fixed plate 106 and the second fixed plate 107 are arranged on both sides of the switch body 100, and the size of the first fixed plate 106 is the same as that of the second fixed plate 107.

[0043] In this embodiment, during assembly, the symmetrical structure can quickly realize the positioning and docking of the fixed plate and the insulating support 105 and the insulating cross beam 115, reduce assembly errors, and improve production efficiency; during operation, the two fixed plates evenly share the weight and stress of the insulating support 105, the vacuum arc-extinguishing chamber 104, the isolation assembly and other components, avoiding deformation or displacement of the fixed plate due to excessive unilateral stress, and through symmetrical stress distribution, ensuring the rigidity and stability of the overall structure of the switch, preventing the structural deformation from affecting the action accuracy of the magnetic control mechanism 101 and the transmission part, and further ensuring the reliability of the long-term operation of the switch.

[0044] It should be noted that the two sides of the vacuum arc-extinguishing chamber 104 are provided with connecting seats 112, and the connecting seats 112 correspond one-to-one with the insulating pull rods 103.

[0045] In this embodiment, when the magnetic control mechanism 101 drives the transmission part to act, the insulating pull rod 103 is connected with the arc-extinguishing chamber moving contact 105a through the connecting seat 112, and the alignment design of the connecting seat 112 ensures that the driving force of the insulating pull rod 103 is transmitted along the axis direction of the arc-extinguishing chamber, avoiding the contact deviation of the moving contact 105a and the static contact 105b due to the deviation of the transmission direction.

[0046] It is worth noting that the lower end of the switch body 100 is provided with the insulating cross beam 115, the two ends of the insulating cross beam 115 are detachably connected with the lower ends of the first fixed plate 106 and the second fixed plate 107, and the contact blade rotating shaft 108 is arranged above the insulating cross beam 115.

[0047] In this embodiment, during normal operation, the insulating cross beam 115 provides stable support for the contact blade rotating shaft 108; when the lower isolation assembly of the switch needs to be repaired or replaced, the connecting structure of the insulating cross beam 115 and the fixed plate can be removed to quickly expose the isolation assembly, reducing the difficulty and cost of maintenance; when the circuit needs to be isolated, the contact blade rotating shaft 108 is driven to rotate, driving the isolation contact blade 114 to rotate around the rotating shaft, so that the isolation contact blade 114 is separated from the isolation contact 113 connected with the static contact 105b of the vacuum arc-extinguishing chamber 104, realizing physical isolation of the circuit; the stable support of the insulating cross beam 115 ensures that the contact blade rotating shaft 108 does not deviate during rotation, ensuring the alignment accuracy of the isolation contact blade 114 and the isolation contact 113, further improving the reliability of the action of the isolation assembly, and strengthening the protection capability of the power system.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fast switch based on a three-magnetic-control mechanism, characterized in that, The switch body (100) includes a switch body (100), the upper end of which is provided with three magnetic control mechanisms (101), the three magnetic control mechanisms (101) are respectively adapted to the ABC three-phase circuit, the magnetic control mechanism (101) includes a driving part, a transmission part and a housing (101a), the inner side of the switch body (100) is provided with an insulating support (105), the upper end of the insulating support (105) is provided with a vacuum interrupter (104), the inner cavity of the vacuum interrupter (104) is respectively provided with a stationary contact (105b) and a moving contact (105a), and the lower end of the vacuum interrupter (104) is provided with an isolation component; The isolation assembly includes a contact blade shaft (108) disposed below the switch body (100). An isolation contact blade (114) is disposed at the upper end of the contact blade shaft (108). An isolation contact (113) is disposed on one side of the isolation contact blade (114). The isolation contact (113) is connected to the stationary contact (105b) of the vacuum interrupter (104). The contact blade shaft (108) is used to drive the isolation contact blade (114) to move in coordination with the isolation contact (113) to realize the isolation switch.

2. The fast switch based on a three-magnetic-control mechanism according to claim 1, characterized in that, The driving unit consists of an electromagnetic coil (101c) and an iron core (101b), and the electromagnetic coil (101c) and the iron core (101b) are located in the middle of the inner cavity of the housing (101a). The electromagnetic coil (101c) is located on the outside of the iron core (101b), thereby driving the moving contact (105a) of the vacuum interrupter (104) to realize the rapid switching of the circuit.

3. The fast switch based on a three-magnetic-control mechanism according to claim 2, characterized in that, The transmission unit includes an insulating pull rod (103) and a connecting pull rod (109). The two ends of the connecting pull rod (109) are connected to the magnetic control mechanism (101) and the insulating pull rod (103) respectively. The end of the insulating pull rod (103) away from the connecting pull rod (109) is connected to the moving contact (105a) of the vacuum interrupter (104).

4. The fast switch based on a three-magnetic-control mechanism according to claim 2, characterized in that, The insulating pull rod (103) has a built-in spring, which is used to transmit tension, ensure the contact pressure of the vacuum interrupter (104), and suppress contact bounce.

5. The fast switch based on a three-magnetic-control mechanism according to claim 3 or 4, characterized in that, An adjusting nut (110) is fixedly installed below the connecting rod (109). The adjusting nut (110) has a slot (110a). The tripping shaft (102) is a hexagonal tripping shaft. The tripping shaft (102) is provided with six drive arms (111). The six drive arms (111) are respectively inserted into the slots (110a) of the adjusting nut (110).

6. The fast switch based on a three-magnetic-control mechanism according to claim 1, characterized in that, The sliding surface of the moving contact (105a) is treated with a diamond-like thin film coating, and the stationary contact (105b), moving contact (105a), isolation contact (113) and isolation blade (114) are all made of copper T2 material.

7. The fast switch based on a three-magnetic-control mechanism according to claim 1, characterized in that, The insulating support (105) is made of sheet molding compound and is located in the middle of the switch body (100).

8. The fast switch based on a three-magnetic-control mechanism according to claim 6, characterized in that, The switch body (100) is provided with a first fixing plate (106) and a second fixing plate (107) on both sides respectively. The size of the first fixing plate (106) is the same as that of the second fixing plate (107).

9. The fast switch based on a three-magnetic-control mechanism according to claim 1, characterized in that, Both sides of the vacuum interrupter (104) are provided with connecting seats (112), and the connecting seats (112) correspond one-to-one with the insulating pull rods (103).

10. The fast switch based on a three-magnetic-control mechanism according to claim 1, characterized in that, An insulating beam (115) is provided at the lower end of the switch body (100). The two ends of the insulating beam (115) are detachably connected to the lower ends of the first fixing plate (106) and the second fixing plate (107), respectively, and the contact blade shaft (108) is located above the insulating beam (115).

11. The fast switch based on a three-magnetic-control mechanism according to claim 6, characterized in that, The contact surfaces of the stationary contact (105b), moving contact (105a), isolation contact (113), and isolation blade (114) have a cyanide bright silver plating layer, thereby improving corrosion resistance and conductivity.

12. The fast switch based on a three-magnetic-control mechanism according to claim 1, characterized in that, The isolation assembly at the lower end of the vacuum interrupter (104) drives the isolation contact (114) to move through the contact shaft (108). The contact shaft (108) causes the isolation contact (114) to separate from the isolation contact (113), thereby achieving physical isolation of the circuit.

13. A method for operating a fast switch based on a three-magnetic-control mechanism, characterized in that, Under normal operating conditions, the switching on and off depends on the magnetic control mechanism (101). When the switch is closed, the magnetic control mechanism (101) engages and drives the connecting rod (109) and the insulating rod (103) to move. The adjusting nut (110) moves synchronously with the connecting rod (109). When the switch is opened, the magnetic control mechanism (101) demagnetizes, the spring pull component resets, and the adjusting nut (110) returns to its initial position with the connecting rod (109). When the magnetic control mechanism (101) fails, the hexagonal opening shaft (102) cooperates with the slot (110a) of the adjusting nut (110). To achieve manual tripping: Rotate the hexagonal tripping shaft (102), and the six drive arms (111) on the hexagonal tripping shaft (102) will rotate synchronously. Since the drive arms (111) are stuck in the slot (110a) of the adjusting nut (110), the adjusting nut (110) will be driven to move upward during the rotation. When the adjusting nut (110) is pulled up, the connecting rod (109) and the insulating rod (103) will be pulled simultaneously, which will eventually drive the moving contact (105a) and the stationary contact (105b) of the vacuum interrupter (104) to separate, thus completing the manual tripping.

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