Middle-high voltage rapid circuit breaker

Abstract

The invention belongs to the technical field of medium-high voltage switches, and discloses a medium-high voltage quick circuit breaker, which comprises a static contact, a moving contact and an operating mechanism connected with the moving contact in a vacuum arc extinguish chamber, and is characterized in that the operating mechanism comprises a repulsive force mechanism which comprises a rechargeable opening coil and a rechargeable closing coil, the repulsive force disc is arranged between the two parts and is pushed by electromagnetic force generated after the two parts are electrified respectively; the permanent magnet mechanism comprises a permanent magnet, a permanent magnet coil, a static iron core wrapping the permanent magnet and the permanent magnet coil, and a movable iron core capable of moving up and down relative to the permanent magnet, and electromagnetic force generated by positive and negative electrification of the permanent magnet coil eliminates or strengthens magnetic force of the permanent magnet, so that the movable iron core is far away from or close to the permanent magnet; and the driving shaft penetrates through the repulsive force mechanism and the permanent magnetic mechanism and synchronously moves up and down along with the repulsive force disc and the movable iron core so as to push the movable contact and the static contact to be switched on or switched off. According to the circuit breaker, electromagnetic repulsive force driving is combined with permanent magnet, so that the switching-on and switching-off speed is high, no bounce during switching-on is ensured, and the fault rate is extremely low.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium and high voltage switchgear in electrical equipment, and particularly relates to a medium and high voltage fast circuit breaker. Background Art

[0002] The function of a circuit breaker is to cut off and connect the load circuit, as well as cut off the fault circuit to prevent the accident from expanding and ensure safe operation. With the increasing complexity of the current power grid structure and load characteristics, it is required that the circuit breaker switch has both a fast opening and a non-bouncing closing and a long service life. A fast circuit breaker can not only quickly switch the line to improve power supply reliability or achieve fault current limiting, but also accurately control the closing and opening phases to achieve synchronous operation, greatly reducing the switching overvoltage and inrush current.

[0003] The core component of a fast circuit breaker is the operating mechanism. At present, the operating mechanism generally adopts a spring operating mechanism, a permanent magnet operating mechanism or a hydraulic operating mechanism. The electromagnetic repulsion operating mechanism has an operating time that is only one-tenth of that of a conventional operating mechanism, and has a simple structure and high reliability, and is widely used in the market.

[0004] However, the existing electromagnetic repulsion operating mechanism has the following disadvantages: 1. Fast circuit breakers based on the electromagnetic repulsion principle mostly adopt a disc spring bistable structure. The opening and closing need to first overcome the huge energy storage of the disc spring, so a very high DC voltage is required to generate a huge repulsive force, which is likely to cause an increase in volume and fracture of the repulsive disc, and is more likely to lead to serious closing bounce, opening rebound and damage to the contacts of the fast switch.

[0005] 2. The adjustment of the overtravel distance of the existing fast circuit breaker structure is very troublesome. A special endoscope needs to be extended into the solid-sealed pole column to detect the relevant parts to check whether the overtravel is qualified or the overtravel cannot be adjusted at all.

[0006] 3. The actual application product external shape interface of the existing structure is very different from that of the mature conventional circuit breakers on the market, which limits the application range of the fast circuit breaker and hinders its popularization and application. Summary of the Invention

[0007] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a medium and high voltage fast circuit breaker. Its operating mechanism combines the electromagnetic repulsion drive technology with the permanent magnet holding technology, and through fewer moving parts, the opening and closing speeds are both fast and the closing is ensured to be non-bouncing and have a long service life, and the failure rate is extremely low.

[0008] To achieve the above object, the present invention is realized by the following technical solutions: A medium and high voltage fast circuit breaker includes a static contact and a moving contact in a vacuum arc extinguishing chamber, and an operating mechanism connected to the moving contact. The operating mechanism includes: The repulsive force mechanism includes a rechargeable opening coil and closing coil, and a repulsive force disk located between the two and pushed by the electromagnetic forces generated when the two are energized respectively. The permanent magnet mechanism includes a permanent magnet, a permanent magnet coil, a static iron core that wraps the permanent magnet and the permanent magnet coil, and a moving iron core that can move up and down relative to the permanent magnet. The electromagnetic forces generated when the permanent magnet coil is energized in the forward and reverse directions eliminate or strengthen the magnetic force of the permanent magnet, causing the moving iron core to move away from or close to the permanent magnet. The drive shaft passes through the repulsive force mechanism and the permanent magnet mechanism, and moves up and down synchronously with the repulsive force disk and the moving iron core, thereby pushing the moving contact to close or open with the static contact.

[0009] Furthermore, the permanent magnet mechanism further includes a pole shoe. The permanent magnet is wrapped outside the pole shoe. A circumferential accommodation groove is provided in the static iron core, and the permanent magnet coil is arranged in the accommodation groove. The outer wall of the static iron core wraps the permanent magnet and the pole shoe.

[0010] Furthermore, the permanent magnet mechanism further includes a closing spring. The closing spring is sleeved on the drive shaft and is limited between the pole shoe and the moving iron core.

[0011] Furthermore, the permanent magnet mechanism further includes an upper end cover, a bushing, and a lower end cover. The static iron core is connected to the upper end cover, and the moving iron core, the bushing, and the lower end cover are sequentially arranged on the lower side of the static iron core.

[0012] Furthermore, the repulsive force mechanism is arranged on the upper side or the lower side of the permanent magnet mechanism.

[0013] Furthermore, the bottom of the drive shaft is detachably connected to a closing buffer mechanism.

[0014] Furthermore, the circuit breaker further includes an overtravel adjustment mechanism. The overtravel adjustment mechanism is an overtravel adjustment rod. Its upper end is threadedly connected to the insulating pull rod, and its lower end is threadedly connected to the drive shaft. The thread directions of the upper and lower ends are opposite. The insulating pull rod is connected to the moving contact of the vacuum interrupter.

[0015] Furthermore, the circuit breaker further includes a secondary signal transmission component. The secondary signal transmission component includes a signal auxiliary transmission structure, an auxiliary switch, a secondary aviation plug outlet elbow, and a secondary aviation plug. The signal auxiliary transmission structure connects the drive shaft and the auxiliary switch. The opening and closing states of the circuit breaker are summarized to the secondary aviation plug through the auxiliary switch and the secondary aviation plug outlet elbow and then transmitted.

[0016] Further, the signal auxiliary transmission structure includes a connection head, a connecting plate, and a switching toggle arm. The connection head is fixed to the upper end of the drive shaft and moves up and down synchronously with the drive shaft. The connecting plate is installed on the connecting plate mounting frame to form a seesaw structure. The switching toggle arm is rotatably installed on the auxiliary switch mounting frame. One end of the connecting plate is slidably connected to the connection head, and the other end is slidably connected to one end of the switching toggle arm. One end of the switching toggle arm is connected to the contact of the auxiliary switch.

[0017] Further, the circuit breaker further includes an intelligent control unit and an energy storage capacitor. The energy storage capacitor charges the opening coil, closing coil, and permanent magnet coil respectively, and the intelligent control unit controls the charging and discharging of the energy storage capacitor.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The circuit breaker of the present invention has strong structural versatility, fully considers product compatibility, can be interchanged with mature spring operating mechanism series products, and its appearance and installation dimensions are also consistent with the industry mainstream products, with wide adaptability and convenient for wide application in the market.

[0019] 2. The circuit breaker of the present invention combines the electromagnetic repulsion drive technology with the permanent magnet holding technology, has extremely few moving parts, extremely low failure rate, and the switching opening and closing speeds are both fast and ensure no bounce during closing and long service life.

[0020] 3. The opening time of the circuit breaker of the present invention is less than 4 ms, and the opening and closing speeds are high, meeting the requirements of sensitive industrial loads and improving the power quality of the power system.

[0021] 4. The overtravel adjustment structure of the circuit breaker of the present invention is simple and convenient, and there is no need to use a dedicated endoscope additionally. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the schematic diagram of the overall assembly of the circuit breaker according to Embodiment 1 of the present invention.

[0023] Figure 2 is Figure 1 side sectional view.

[0024] Figure 3 is the schematic diagram of the circuit breaker according to Embodiment 1 of the present invention.

[0025] Figure 4 is the installation schematic diagram of the operating mechanism according to Embodiment 1 of the present invention.

[0026] Figure 5 is the sectional view of the operating mechanism according to Embodiment 1 of the present invention in the opening state.

[0027] Figure 6 is the sectional view of the operating mechanism according to Embodiment 1 of the present invention in the closing state.

[0028] Figure 7 It is an exploded view of the repulsive mechanism of the present invention.

[0029] Figure 8 It is an exploded view of the permanent magnet mechanism of the present invention.

[0030] Figure 9 It is Figure 8 a sectional view of

[0031] Figure 10 It is a sectional view of the overtravel adjusting rod of the present invention.

[0032] Figure 11 It is an exploded view of the signal auxiliary transmission structure of the present invention.

[0033] Figure 12 It is a sectional view of the operating mechanism in the closing state of the second embodiment of the present invention.

[0034] Wherein: 1. Frame; 1-1. Valve; 1-2. Wheel frame; 1-3. Frame cover plate; 2. Propulsion mechanism; 3. Chassis; 4. Contact arm and contact; 5. Solid-sealed pole column; 5-1. Insulating pull rod; 6. Repulsive mechanism; 6-1. Tripping coil; 6-2. Repulsive disc; 6-2-1. Copper repulsive disc; 6-2-2. Aluminum repulsive disc; 6-3. Closing coil; 6-4. Support sleeve; 7. Permanent magnet mechanism; 7-1. Upper end cover; 7-2. Permanent magnet; 7-3. Pole shoe; 7-4. Permanent magnet coil; 7-5. Static iron core; 7-6. Bushing; 7-7. Tripping spring; 7-8. Moving iron core; 7-9. Lower end cover; 8. Driving shaft; 8-1. Upper driving shaft; 8-2. Lower driving shaft; 8-3. Bush; 9. Long bolt; 10. Energy storage capacitor; 11. Intelligent control unit; 12. Overtravel adjusting rod; 13. Oil buffer; 14. Oil buffer mounting bracket; 15. Secondary aviation plug outlet elbow; 16. Secondary aviation plug; 17. Auxiliary switch; 17-1. Auxiliary switch mounting bracket; 18. Link plate; 18-1. Round hole on the link plate; 18-2. Waist hole on the link plate; 18-3. Link plate mounting bracket; 19. Connector; 19-1. Waist hole on the connector; 20. Switching toggle arm. Detailed implementation mode

[0035] The following further clarifies the detailed implementation mode of the present invention in conjunction with the attached drawings. Embodiment 1

[0036] As Figures 1 to 11 shown, it is a medium and high voltage fast circuit breaker, mainly including a frame 1, a propulsion mechanism 2, a chassis 3, a primary conductive component, an operating mechanism, an overtravel adjustment mechanism, a closing buffer mechanism, a secondary signal transmission component, an energy storage capacitor 10, and an intelligent control unit 11.

[0037] The propulsion mechanism 2 and the chassis 3 are arranged on the frame 1. Above the chassis 3, multiple groups of primary conductive components are arranged. The primary conductive component serves as the electrical main circuit of the circuit breaker and includes a contact arm, a contact 4, and a solid-sealed pole column 5. A vacuum interrupter and an insulating pull rod 5-1 are arranged in the solid-sealed pole column 5. Inside the vacuum interrupter, there are a static contact on the upper side and a moving contact on the lower side. The upper end of the insulating pull rod 5-1 is connected to the moving contact, and the lower end is connected to the operating mechanism or the overtravel adjustment mechanism on the lower side. The operating mechanism is installed inside the frame 1 and the chassis 3. On the left and right sides of the frame 1, a shutter 1-1 and a wheel bracket 1-2 are installed. The shutter 1-1 is used to cooperate with the interlock structure inside the electrical cabinet, and the wheel bracket 1-2 facilitates the overall movement of the circuit breaker. The propulsion mechanism 2 is used for the overall circuit breaker to be rocked in and out of the electrical cabinet.

[0038] The contact state of the static contact and the moving contact in the vacuum interrupter of the solid-sealed pole column 5 determines the closing or opening of the circuit breaker, that is: when the static and moving contacts are pressed together, the circuit breaker is in the closed state; when the static and moving contacts are separated, the circuit breaker is in the open state.

[0039] The circuit breaker includes a test position and a working position. In the test position, the whole circuit breaker has just been moved into the electrical cabinet, and the contact arm and the contact 4 do not contact the static contact inside the electrical cabinet, and the electrical system cannot form a complete loop. In the working position, the propulsion mechanism 2 rocks the whole circuit breaker into the electrical cabinet, and the contact arm, the contact 4, and the static contact inside the electrical cabinet are meshed and contacted, meeting the working prerequisite conditions; when the circuit breaker is in the working position and in the closed state, the primary conductive component is conducting and is connected to the electrical system to form a complete loop, that is, the circuit breaker is connected to the electrical system to work.

[0040] The operating mechanism includes a repulsive force mechanism 6, a permanent magnet mechanism 7, and a drive shaft 8. The repulsive force mechanism 6 and the permanent magnet mechanism 7 are arranged up and down, respectively arranged inside the frame 1 and the chassis 3, and their up and down positions can be freely arranged. The drive shaft vertically penetrates the centers of both from top to bottom. The repulsive force mechanism 6 mainly serves as the drive unit for closing and opening, and the permanent magnet mechanism 7 mainly serves as the holding unit for closing and opening.

[0041] In this embodiment, the repulsive force mechanism 6 is arranged above, and the permanent magnet mechanism 7 is arranged below, that is, the repulsive force mechanism 6 is arranged inside the chassis 3, and the permanent magnet mechanism 7 is arranged inside the frame 1.

[0042] The drive shaft 8 vertically penetrates through the centers of the repulsive force mechanism 6 and the permanent magnet mechanism 7 from top to bottom, and includes an upper drive shaft 8-1 and a lower drive shaft 8-2, which are threadedly connected. The upper end of the upper drive shaft 8-1 is provided with a thread for fixedly connecting with the overtravel adjusting mechanism or the insulating pull rod 5-1. When the operating mechanism drives the opening and closing of the circuit breaker, the insulating pull rod 5-1 is lifted for closing and pulled down for opening, thereby realizing the opening and closing movement of the circuit breaker. The lower end of the lower drive shaft 8-2 is detachably connected to the opening buffer mechanism.

[0043] The upper drive shaft 8-1 penetrates through the repulsive force mechanism 6 on the upper side and the permanent magnet mechanism 7 on the lower side, and the lower drive shaft 8-2 penetrates through the permanent magnet mechanism 7 on the lower side and the repulsive force mechanism 6 on the upper side. The two shafts meet at the moving iron core of the permanent magnet mechanism 7 and are threadedly connected.

[0044] The drive shaft 8 can be designed as a whole, but a two-piece design is more convenient for the assembly of parts. For example, the opening spring 7-7 of the permanent magnet mechanism 7 can be inserted into the upper drive shaft 8-1 before the upper drive shaft 8-1 and the lower drive shaft 8-2 are fixed. After the two shafts are fixed, the opening spring 7-7 is limited between the pole shoe 7-3 of the permanent magnet mechanism 7 and the moving iron core 7-8 of the permanent magnet mechanism 7.

[0045] The repulsive force mechanism 6 is arranged on the upper side of the permanent magnet mechanism 7. The repulsive force mechanism 6 includes a tripping coil 6-1, a closing coil 6-3, and a repulsive force disc 6-2. The tripping coil 6-1 and the closing coil 6-3 are arranged vertically, and the distance between them is fixed by a support sleeve 6-4. The repulsive force disc 6-2 is arranged between them and can move up and down.

[0046] The permanent magnet mechanism 7 is arranged on the lower side of the repulsive force mechanism 6 and includes an upper end cover 7-1, a permanent magnet 7-2, a pole shoe 7-3, a permanent magnet coil 7-4, a static iron core 7-5, a bushing 7-6, an opening spring 7-7, a moving iron core 7-8, and a lower end cover 7-9.

[0047] Specifically, the upper end cover 7-1 is fixedly connected to the frame 1. Correspondingly, the bottom plate of the chassis 3 and the frame cover plate 1-3 of the frame 1 are respectively provided with a relief groove, the size of which is adapted to the repulsive force mechanism 6 and the permanent magnet mechanism 7, facilitating the fixed connection of the two to form a whole.

[0048] The permanent magnet 7-2 is wrapped around the outer side of the pole shoe 7-3. The permanent magnet 7-2 is not suitable for multiple impacts. The suction force of the permanent magnet 7-2 is conducted through the pole shoe 7-3. A circular receiving groove is provided in the static iron core 7-5. The permanent magnet coil 7-4 is arranged in the receiving groove. At the same time, the outer wall of the static iron core 7-5 wraps the permanent magnet 7-2 and the pole shoe 7-3 until the static iron core 7-5 can be fixedly connected to the upper end cover 7-1. Thus, the upper end cover 7-1, the permanent magnet 7-2, the pole shoe 7-3, the permanent magnet coil 7-4 and the static iron core 7-5 form a whole, constituting the "permanent magnet static structure" with a relatively fixed position in the permanent magnet mechanism 7.

[0049] The moving iron core 7-8, the bushing 7-6, and the lower end cover 7-9 are sequentially arranged on the lower side of the static iron core 7-5. The bushing 7-6 is placed between the static iron core 7-5 and the lower end cover 7-9 to adjust the distance between the static iron core 7-5 and the lower end cover 7-9. The three form a whole, constituting the "permanent magnet moving structure" that can move up and down relative to the permanent magnet "static structure" in the permanent magnet mechanism 7.

[0050] A pole shoe cylindrical boss protruding downward is provided at the center of the bottom surface of the pole shoe 7-3. A static iron core hole for making way is provided on the bottom surface of the static iron core 7-5. A moving iron core cylindrical boss protruding upward and adapted to the pole shoe cylindrical boss is provided at the center of the top surface of the moving iron core 7-8. At the same time, in addition to the through hole for installing the drive shaft 8 provided at the center of the pole shoe cylindrical boss and the moving iron core cylindrical boss, a groove for accommodating the closing spring 7-7 is also provided. The closing spring 7-7 is sleeved on the drive shaft 8 and is limited between the pole shoe 7-3 and the moving iron core 7-8, so that the moving iron core 7-8 can move up and down relative to the pole shoe 7-3.

[0051] Since the closing spring 7-7 is limited between the pole shoe 7-3 and the moving iron core 7-8, when the circuit breaker switches from the open state to the closed state, the moving iron core 7-8 is lifted upward by the magnetic suction force, and the closing spring 7-7 is compressed to store energy for the next opening. When the circuit breaker switches from the closed state to the open state, the magnetic suction force originally acting on the moving iron core 7-8 disappears and it moves downward, and the closing spring 7-7 resets to release energy, accelerating the downward movement of the moving iron core 7-8.

[0052] The upper drive shaft 8-1 is fixedly connected to the repulsive disk 6-2. At the same time, the upper drive shaft 8-1 and the lower drive shaft 8-2 are fixedly connected to the moving iron core 7-8 at the intersection. Specifically, the upper drive shaft 8-1 is threadedly connected to the repulsive disk 6-2 and the two are completely fixed by riveting the two ends of the repulsive disk. After the two shafts are threadedly connected at the intersection, they are fixed to the moving iron core 7-8 with thread glue, so as to realize the relative fixation of the upper drive shaft 8-1, the repulsive disk 6-2, the lower drive shaft 8-2, and the moving iron core 7-8, and they can move up and down synchronously. That is to say, when the drive shaft 8 moves up and down, it drives the repulsive disk 6-2 and the moving iron core 7-8 to move up and down synchronously, and vice versa.

[0053] In addition, in order to facilitate the flexible rotation of the upper drive shaft 8-1 and the lower drive shaft 8-2, bushings 8-3 are respectively arranged at the centers of the pole shoes 7-3, the upper end cover 7-1 and the lower end cover 7-9, and the bushings 8-3 are respectively sleeved on the outer sides of the upper drive shaft 8-1 and the lower drive shaft 8-2.

[0054] For the stability of the circuit breaker device, long bolts 9 are symmetrically arranged on the operating mechanism and sequentially pass through the opening coil 6-1, the support sleeve 6-4, the closing coil 6-3, the upper end cover 7-1, and the lower end cover 7-9 from top to bottom, fixing the repulsive force mechanism 6 and the permanent magnet mechanism 7 into a whole.

[0055] The permanent magnet 7-2 is wrapped around the outside of the pole shoe 7-3, and the suction force of the permanent magnet 7-2 is conducted through the pole shoe 7-3. The "permanent magnet static structure" makes the relative positions between the permanent magnet 7-2, the pole shoe 7-3, the permanent magnet coil 7-4, and the static iron core 7-5 fixed. The main function of the permanent magnet coil 7-4 is: when the permanent magnet coil 7-4 is energized instantaneously, it generates an effect of canceling or strengthening the magnetic field of the permanent magnet 7-2.

[0056] The power-on directions of the permanent magnet coil 7-4 are divided into two types, namely: If it is considered positive power-on during opening, a magnetic field opposite to that of the permanent magnet 7-2 is generated, canceling the magnetic field of the permanent magnet 7-2 itself. At this time, there is no magnetic suction force between the permanent magnet 7-2 and the pole shoe 7-3 on the moving iron core 7-8, and the moving iron core 7-8 moves downward and separates from the pole shoe 7-3, thereby driving the lower drive shaft 8-2 to move downward, that is, changing from the closing state to the opening state; On the contrary, during closing, it is reverse power-on, generating a magnetic field in the same direction as the permanent magnet 7-2, strengthening the magnetic suction force generated by the permanent magnet 7-2. Then, the moving iron core 7-8 moves upward in the direction of approaching the pole shoe 7-3 from the state of being away from the pole shoe 7-3, thereby driving the lower drive shaft 8-2 to move upward, that is, changing from the opening state to the closing state.

[0057] It should be noted that the power-on of the permanent magnet coil 7-4 is an instantaneous pulse signal. After the permanent magnet coil 7-4 loses power, it immediately returns to the non-powered normal state, and the permanent magnet 7-2 also returns to its original magnetic field normal state.

[0058] It should be noted here that in this embodiment, the repulsive disk 6-2 includes a copper repulsive disk 6-2-1 and an aluminum repulsive disk 6-2-2. The aluminum repulsive disk 6-2-2 is at the center, and the copper repulsive disk 6-2-1 is concentrically arranged on the upper surface of the aluminum repulsive disk 6-2-2. Since it is only arranged on the upper surface of the aluminum repulsive disk 6-2-2, rather than on both the upper and lower surfaces, a copper-aluminum asymmetric composite repulsive disk is formed. The inner diameter of the repulsive disk 6-2-1 is the same as or slightly larger than the inner diameter of the opening coil 6-1. When opening, the induced eddy current is distributed in the copper area on the surface of the repulsive disk. At the same time, a thickened annular structure is provided at the center of the aluminum repulsive disk 6-2-2, which not only increases the fixed length with the upper drive shaft 8-1 but also can be used to improve the stress concentration phenomenon of the repulsive disk caused by electromagnetic repulsion.

[0059] Compared with the repulsive disk made of a single copper material, the copper-aluminum asymmetric composite repulsive disk made of two materials, copper and aluminum, has the following advantages: 1. Under the same size conditions, the copper-aluminum asymmetric composite repulsive disk in this embodiment has a smaller mass and higher strength than the copper material repulsive disk. Therefore, under the action of approximately the same electromagnetic repulsion force, it obtains a higher acceleration, and at the same time, its vibration and deformation are smaller, thereby improving the opening speed of the electromagnetic repulsion mechanism, reducing the initial opening time, effectively avoiding the huge deformation of the repulsive disk made of a single copper material, increasing its mechanical strength, and improving the action reliability; 2. Under the same size conditions, compared with the aluminum material repulsive disk, the copper-aluminum asymmetric composite repulsive disk in this embodiment has a higher conductivity in the eddy current area and a larger induced eddy current, thereby obtaining a larger electromagnetic repulsion force and improving the driving efficiency of the electromagnetic repulsion mechanism.

[0060] The opening buffer mechanism is arranged below the operating mechanism and includes an oil buffer 13 and an oil buffer mounting bracket 14. The lower side of the oil buffer 13 is arranged in the frame 1 through the oil buffer mounting bracket 14, and the upper side is separably connected to the lower drive shaft 8-2. That is, during the opening process, the lower drive shaft 8-2 moves downward and presses on the oil buffer 13, effectively buffering the kinetic energy of the opening impact and reducing the rebound of the operating mechanism during opening. However, during the closing process, the lower drive shaft 8-2 moves upward and disengages from the oil buffer 13 without contact.

[0061] The intelligent control unit 11 and the energy storage capacitor 10 are both arranged in the chassis 3. The energy storage capacitor 10 includes a closing capacitor and an opening capacitor, which are respectively connected to the closing coil 6-3, the opening coil 6-1, and the permanent magnet coil 7-4, and release electrical energy as needed. In fact, the energy storage capacitor is a capacitor bank, including 4 capacitors, which are successively connected to the closing circuit of the closing coil, the opening coil, the permanent magnet coil, and the opening circuit of the permanent magnet coil; while the intelligent control unit 11 is used to control the charging and discharging of the energy storage capacitor 10. When it issues closing and opening control commands (the commands are pulse signals, that is, short-term), the corresponding capacitors release electrical energy, and during the non-action time period, it charges the energy storage capacitor 10 to prepare for the next discharge.

[0062] The overtravel adjusting mechanism is an overtravel adjusting rod 12, which is arranged in the adjusting overtravel area set on the chassis 3. Its upper end is threadedly connected to the insulating pull rod 5-1 connected to the moving contact in the vacuum interrupter, and its lower end is threadedly connected to the upper drive shaft 8-1. The thread directions at the upper and lower ends are opposite, so that when the overtravel adjusting rod 12 is rotated, the upper and lower ends can be shortened or lengthened simultaneously.

[0063] Correspondingly, an adjusting window is provided in the adjusting overtravel area. When the overtravel needs to be adjusted, the circuit breaker is adjusted to the open position (when in the closed position, the moving iron core 7-8 is attracted to the pole shoe 7-3, and the drive shaft 8 cannot rotate). The overtravel adjusting rod 12 is rotated through a wrench from the adjusting window, that is, the overtravel is controlled by adjusting the depth of the thread of the lower end of the insulating pull rod 5-1 screwed into the overtravel adjusting rod 12. After the adjustment is in place, the window can be closed.

[0064] The advantages of such a setting are as follows: the adjustment process is intuitive and convenient, and the overtravel range can be accurately controlled. Without using an endoscope, different specifications of circuit breakers can be adapted only through the overtravel adjusting rod 12, which has great economic benefits.

[0065] The secondary signal transmission component mainly includes an auxiliary switch 17, a signal auxiliary transmission structure, a secondary aviation plug outlet elbow 15 and a secondary aviation plug 16. The auxiliary switch 17 is provided with contacts and multiple groups of contacts, and the opening and closing states of the circuit breaker are summarized into the secondary aviation plug 16 through wires for use by the lower-level system.

[0066] In this embodiment, the wire harness of the circuit breaker is led out from the side of the chassis 3 through the secondary aviation plug outlet elbow 15 and summarized into the secondary aviation plug 16 hanging on the rack 1 through a hose.

[0067] In addition, in order to facilitate the accurate transmission of the electrical signals of the circuit breaker during the opening and closing switching process between the secondary aviation plug 16 and the auxiliary switch 17, a signal auxiliary transmission structure is also provided, which is arranged in the chassis 3 and includes a connector 19, a connecting plate 18 and a switching elbow 20; the connector 19 is fixed at the upper end of the upper drive shaft 8-1 and moves up and down synchronously with the upper drive shaft 8-1. The connector 19 is provided with a connector waist hole 19-1 for slidably connecting with one end of the connecting plate 18; the middle part of the connecting plate 18 is movably arranged on the connecting plate mounting frame 18-3 to form a seesaw structure. One end of the connecting plate 18 is provided with a connecting plate round hole 18-1, which is slidably connected to the connector waist hole 19-1 through a connecting pin, and the other end is provided with a connecting plate waist hole 18-2, which is slidably connected to one end of the switching elbow 20; the auxiliary switch 17 is installed and fixed through the auxiliary switch mounting frame 17-1. The middle part of the switching elbow 20 is rotatably arranged on the auxiliary switch mounting frame 17-1. One end of the switching elbow 20 is provided with a square hole for connecting with the contact of the auxiliary switch 17, and the other end is provided with an elbow protrusion for slidably connecting with the connecting plate round hole 18-1 of the connecting plate 18.

[0068] As shown Figure 4 in the figure, the solid line indicates that the signal auxiliary transmission structure is in the open position, and the dashed line indicates that the signal auxiliary transmission structure is in the closed position.

[0069] During the process of the circuit breaker in this embodiment switching from closing to opening: (1) The working process of the operating mechanism is as follows: At this time, the initial state of the circuit breaker is closed (that is, the moving and static contacts of the vacuum interrupter are in the closed state). The repulsive disk 6-2 contacts the upper opening coil 6-1. There is a magnetic attraction force between the moving iron core 7-8 and the pole shoe 7-3, and the opening spring 7-7 is in a compressed state.

[0070] When opening is required, the intelligent control unit 11 issues an opening control command, and the energy storage capacitor 10 releases the corresponding electric energy, enabling the opening coil 6-1 of the repulsive mechanism 6 and the permanent magnet coil 7-4 of the permanent magnet mechanism 7 to be energized: On the one hand, when the opening coil 6-1 is energized, an induced eddy current is generated due to the magnetic field generated by the energized opening coil 6-1 above the repulsive disk 6-2, generating a downward pulsed electromagnetic repulsive force, which pushes the repulsive disk 6-2 to move downward. The repulsive disk 6-2 drives the upper drive shaft 8-1 to move downward until it contacts the closing coil 6-3; On the other hand, since the permanent magnet coil 7-4 of the permanent magnet mechanism 7 is positively energized, a magnetic field opposite to that of the permanent magnet 7-2 is generated, canceling the magnetic field generated by the permanent magnet 7-2. The magnetic attraction force that originally existed between the moving iron core 7-8 and the pole shoe 7-3 in the closed state disappears, and the moving iron core 7-8 moves downward away from the contact with the pole shoe 7-3. The opening spring 7-7 is released from the compressed state and rebounds, accelerating the downward movement of the moving iron core 7-8.

[0071] Under the combined downward movement of the repulsive disk 6-2 and the moving iron core 7-8, the upper drive shaft 8-1 and the lower drive shaft 8-2 move downward synchronously. Then, the overtravel adjusting rod 12 on the upper side of the upper drive shaft 8-1 drives the insulating pull rod 5-1 to move downward, realizing the separation of the moving and static contacts of the vacuum interrupter and completing the opening operation.

[0072] At the same time, since the lower drive shaft 8-2 moves downward and presses on the oil buffer 13, it effectively buffers the kinetic energy of the opening impact and reduces the rebound when the moving and static contacts open.

[0073] (2) The working process of the signal auxiliary transmission structure is as follows: As shown Figure 4As shown, during the opening process, the upper drive shaft 8-1 moves downward, driving the connector 19 to move downward synchronously, and then driving the connecting plate 18 to rotate counterclockwise synchronously. That is, the connecting pin at the left end of the connecting plate 18 slides to the left side of the waist hole 19-1 of the connector, and the crank arm protrusion slides to the right side of the waist hole 18-2 of the connecting plate, thereby driving the switching crank arm 20 to rotate counterclockwise. The switching crank arm 20 drives the auxiliary switch 17 to switch from the closing state to the opening state through the contact of the auxiliary switch 17, and then transmits the electrical signal related to opening to the secondary socket 16.

[0074] During the process of the circuit breaker in this embodiment switching from opening to closing: (1) The working process of the operating mechanism is as follows: At this time, the initial state of the circuit breaker is the opening state (that is, the moving and static contacts of the vacuum interrupter are in a separated state). The repulsive disk 6-2 contacts the lower closing coil 6-3. The moving iron core 7-8 is separated from the pole shoe 7-3 and there is no magnetic attraction force. The opening spring 7-7 is in an uncompressed state.

[0075] When closing is required, the intelligent control unit 11 issues a closing control command, and the energy storage capacitor 10 releases the corresponding electrical energy, enabling the closing coil 6-3 of the repulsive mechanism 6 and the permanent magnet coil 7-4 of the permanent magnet mechanism 7 to be energized: On the one hand, when the closing coil 6-3 is energized, the closing coil 6-3 generates an induced eddy current in the magnetic field below the repulsive disk 6-2, generating an upward pulsed electromagnetic repulsive force, pushing the repulsive disk 6-2 to move upward. The repulsive disk 6-2 then drives the upper drive shaft 8-1 to move upward until it contacts the opening coil 6-1. On the other hand, the permanent magnet coil 7-4 of the permanent magnet mechanism 7 is reversely energized, generating a magnetic field in the same direction as the permanent magnet 7-2, strengthening the magnetic field generated by the permanent magnet 7-2. The moving iron core 7-8 changes from having no magnetic attraction force to being subjected to an upward magnetic attraction force and moves upward until it contacts the pole shoe.

[0076] Under the combined upward movement of the repulsive disk 6-2 and the moving iron core 7-8, the upper drive shaft 8-1 and the lower drive shaft 8-2 move upward synchronously, and then drive the insulating pull rod 5-1 to lift upward through the overtravel adjusting rod 12, realizing the closing of the moving and static contacts of the vacuum interrupter. And the magnetic attraction force between the moving iron core 7-8, the permanent magnet 7-2, and the pole shoe 7-3 keeps the three in contact all the time, so that the moving and static contacts of the vacuum interrupter maintain the closing action.

[0077] During the closing process, the restoring force of the opening spring 7-7 when compressed is less than the magnetic attraction force of the permanent magnet 7-2 and the pole shoe 7-3 on the moving iron core 7-8; moreover, the opening spring 7-7 also plays a role in buffering the closing impact during the upward suction process of the moving iron core 7-8 due to its compression, reducing the possibility of closing bounce, and ensuring the service life of the moving and static contacts in the vacuum interrupter; in addition, the upper drive shaft 8-1 has a certain upward pressing force on the moving contact through the insulating pull rod 5-1, ensuring the reliability of the closing of the moving and static contacts.

[0078] Due to the upward movement of the lower drive shaft 8-2, it disengages from the oil buffer 13 and has no contact.

[0079] (2) The working process of the signal auxiliary transmission structure is as follows: As Figure 4 shown, the upward movement of the upper drive shaft 8-1 drives the connector 19 to move upward synchronously, and then drives the connecting plate 18 to rotate clockwise synchronously, that is: the connecting pin at the left end of the connecting plate 18 slides to the right side of the waist hole 19-1 of the connector, and the crank arm protrusion slides to the left side of the waist hole 18-2 of the connecting plate, and then drives the switching crank arm 20 to rotate clockwise. The switching crank arm 20 drives the auxiliary switch 17 to switch from the opening state to the closing state through the contacts of the auxiliary switch 17, and then transmits the electrical signals related to closing to the secondary aviation plug 16. Embodiment 2

[0080] As Figure 12 shown, the main difference between Embodiment 2 and Embodiment 1 is that: the repulsive mechanism 6 and the permanent magnet mechanism 7 of the operating mechanism have the same structure itself, but the repulsive mechanism 6 is integrally moved downward to the lower side of the permanent magnet mechanism 7, that is, the permanent magnet mechanism 7 is on the upper side and the repulsive mechanism 6 is on the lower side. The repulsive mechanism 6 is arranged at the bottom of the lower cover plate 7-9, and both are arranged in the frame 1 through the upper cover plate. At the same time, the installation structures of the upper drive shaft 8-1 and the lower drive shaft 8-2 with the repulsive mechanism 6 and the permanent magnet mechanism 7 do not change either. What changes is that the bottom end of the lower drive shaft 8-2 becomes upward and is connected to the upper overtravel adjusting rod 12, and the connector 19 of the signal auxiliary transmission structure is fixed on the lower drive shaft 8-2, while the top end of the upper drive shaft 8-1 becomes downward and is detachably connected to the oil buffer 13 of the lower side opening buffer mechanism.

[0081] And due to the overall downward movement of the operating mechanism, only the corresponding lengths of the upper drive shaft 8-1 and the lower drive shaft 8-2 need to be adjusted to adapt to the connection with other mechanisms.

[0082] When the circuit breaker needs to trip, its initial state is closed. The energy storage capacitor 10 discharges to the permanent magnet coil 7-4 of the permanent magnet mechanism 7 and the trip coil 6-1 of the repulsive force mechanism 6 respectively. The permanent magnet coil 7-4 is energized in the forward direction, canceling the magnetic field generated by the permanent magnet 7-2. The moving iron core disengages from the contact with the pole shoe 7-3 and moves downward. The trip spring 7-7 rebounds and accelerates downward to drive the moving iron core 7-8, and then drives the lower drive shaft 8-2 downward until it contacts the lower end cover 7-9. The trip coil 6-1 generates a downward pulsed electromagnetic repulsive force, pushing the repulsive disk 6-2 downward, and then driving the upper drive shaft 8-1 downward until it contacts the closing coil 6-3. The lower drive shaft 8-2 and the upper drive shaft 8-1 move downward simultaneously until the upper drive shaft 8-1 presses on the oil buffer 13 to complete the tripping operation.

[0083] Conversely, when the circuit breaker needs to close, its initial state is open. The closing capacitor of the energy storage capacitor 10 discharges to the permanent magnet coil 7-4 of the permanent magnet mechanism 7 and the closing coil 6-3 of the repulsive force mechanism 6 respectively. The permanent magnet coil 7-4 is energized in the reverse direction, strengthening the magnetic field generated by the permanent magnet 7-2. The moving iron core 7-8 moves upward under the magnetic attraction force until it contacts the pole shoe, driving the lower drive shaft 8-2 upward. The closing coil 6-3 generates an upward pulsed electromagnetic repulsive force, pushing the repulsive disk 6-2 upward, and then driving the upper drive shaft 8-1 upward until it contacts the trip coil 6-1. The lower drive shaft 8-2 and the upper drive shaft 8-1 move upward simultaneously, and through the overtravel adjusting rod 12 and the insulating pull rod 5-1, they move upward to make the moving contact and the static contact press together to complete the closing operation.

[0084] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A medium- and high-voltage fast circuit breaker, comprising a stationary contact and a moving contact in a vacuum interrupter, and an operating mechanism connected to the moving contact, characterized in that: The operating mechanism comprises: A repulsion mechanism (6) comprises a chargeable opening coil (6-1) and a closing coil (6-3), and a repulsion disk (6-2) located between the two and pushed by electromagnetic forces generated when the two coils are energized; A permanent magnet mechanism (7) comprises a permanent magnet (7-2), a permanent magnet coil (7-4), a static iron core (7-5) encapsulating the permanent magnet (7-2) and the permanent magnet coil (7-4), and a moving iron core (7-8) capable of moving up and down relative to the permanent magnet (7-2); the electromagnetic force generated by the permanent magnet coil (7-4) being energized in the forward and reverse directions eliminates or strengthens the magnetic force of the permanent magnet (7-2), so that the moving iron core (7-8) moves away from or close to the permanent magnet (7-2); The driving shaft (8) passes through the repulsion mechanism (6) and the permanent magnet mechanism (7), and moves up and down synchronously with the repulsion disk (6-2) and the moving iron core (7-8), thereby pushing the moving contact and the static contact to close or open.

2. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The permanent magnet mechanism (7) further comprises a pole shoe (7-3), the permanent magnet (7-2) is wrapped around the outside of the pole shoe (7-3), the static iron core (7-5) is provided with a circle of receiving grooves, the permanent magnet coil (7-4) is arranged in the receiving groove, and the outer wall of the static iron core (7-5) wraps around the permanent magnet (7-2) and the pole shoe (7-3).

3. A medium and high voltage fast circuit breaker according to claim 2, characterized in that: The permanent magnet mechanism (7) further comprises a trip spring (7-7), wherein the trip spring (7-7) is sleeved on the drive shaft (8) and is limited between the pole shoe (7-3) and the moving iron core (7-8).

4. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The permanent magnet mechanism (7) further comprises an upper end cover (7-1), a bushing (7-6) and a lower end cover (7-9); the static iron core (7-5) is connected to the upper end cover (7-1); and the moving iron core (7-8), the bushing (7-6) and the lower end cover (7-9) are sequentially arranged on the lower side of the static iron core (7-5).

5. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The repulsive force mechanism (6) is arranged on the upper side or the lower side of the permanent magnet mechanism (7).

6. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The bottom of the driving shaft (8) is detachably connected to a brake opening buffer mechanism.

7. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises an overtravel adjustment mechanism, which is an overtravel adjustment rod (12), the upper end of which is threadedly connected to the insulating pull rod (5-1), and the lower end of which is threadedly connected to the drive shaft (8), the threads at the upper and lower ends being in opposite directions, and the insulating pull rod (5-1) is connected to the moving contact of the vacuum interrupter.

8. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises a secondary signal transmission component, the secondary signal transmission component comprising a signal auxiliary transmission structure, an auxiliary switch (17), a secondary aerial plug outlet turn (15) and a secondary aerial plug (16); the signal auxiliary transmission structure connects the drive shaft (8) and the auxiliary switch (17); the opening and closing states of the circuit breaker are aggregated to the secondary aerial plug (16) for output via the auxiliary switch (17) and the secondary aerial plug outlet turn (15).

9. A medium and high voltage fast circuit breaker according to claim 8, characterized in that: The signal auxiliary transmission structure comprises a connector (19), a connecting plate (18) and a switching arm (20); the connector (19) is fixed to the upper end of the drive shaft (8) and moves up and down synchronously with the drive shaft (8); the connecting plate (18) is mounted on a connecting plate mounting frame (18-3) to form a seesaw structure; the switching arm (20) is rotatably mounted on an auxiliary switch mounting frame (17-1); one end of the connecting plate (18) is slidably connected to the connector (19), and the other end is slidably connected to one end of the switching arm (20); and one end of the switching arm (20) is connected to a contact of the auxiliary switch (17).

10. A medium and high voltage fast circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises an intelligent control unit (11) and an energy storage capacitor (10); the energy storage capacitor (10) charges the opening coil (6-1), the closing coil (6-3) and the permanent magnet coil (7-4) respectively; and the intelligent control unit (11) controls the charging and discharging of the energy storage capacitor (10).

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