Middle-high voltage rapid circuit breaker

Abstract

The utility model 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-extinguishing chamber, and the operating mechanism comprises a repulsive force mechanism comprising 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

A medium- and high-voltage fast circuit breaker Technical Field

[0001] This utility model belongs to the field of electrical equipment - medium and high voltage switch technology, and specifically relates to a medium and high voltage fast circuit breaker. Background Technology

[0002] The function of a circuit breaker is to disconnect and connect load circuits, as well as disconnect faulty circuits, to prevent accidents from escalating and ensure safe operation. As the structure and load characteristics of the current power grid become increasingly complex, circuit breaker switches are required to be fast to open, close without bounce, and have a long service life. Fast circuit breakers can quickly switch lines to improve power supply reliability or achieve fault current limiting; they can also accurately control the closing and opening phases to achieve synchronous operation, significantly reducing operating overvoltage and inrush current.

[0003] The core component of a fast circuit breaker is the operating mechanism. Currently, operating mechanisms commonly use spring operating mechanisms, permanent magnet operating mechanisms, or hydraulic operating mechanisms. However, the operating time of an electromagnetic repulsion operating mechanism is only one-tenth that of a conventional operating mechanism. Moreover, it has a simple structure and high reliability, and is widely used in the market.

[0004] However, existing electromagnetic repulsion operating mechanisms have the following drawbacks:

[0005] 1. Fast circuit breakers based on the electromagnetic repulsion principle mostly adopt a disc spring bistable structure. Opening and closing require overcoming the huge energy stored in the disc spring, which requires a very high DC voltage and generates a huge repulsive force. This can easily lead to an increase in size, breakage of the repulsion disc, and more likely to cause serious closing bounce, opening rebound, and damage to the fast switching contacts.

[0006] 2. Adjusting the overtravel distance of existing fast circuit breakers is very troublesome. It requires a special endoscope to be inserted into the solid-sealed pole to detect whether the overtravel is qualified or cannot be adjusted at all.

[0007] 3. The appearance and interface of existing structured products differ greatly from those of mature conventional circuit breakers on the market, which limits the application scope of fast circuit breakers and hinders their promotion and application. Summary of the Invention

[0008] To address the problems existing in the prior art, this utility model provides a medium- and high-voltage fast circuit breaker whose operating mechanism combines electromagnetic repulsion drive technology with permanent magnet holding technology. With fewer moving parts, it achieves fast opening and closing speeds, ensures no bouncing during closing, long service life, and extremely low failure rate.

[0009] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0010] A medium- and high-voltage fast circuit breaker includes a stationary contact and a moving contact inside a vacuum interrupter, and an operating mechanism connected to the moving contact. The operating mechanism includes:

[0011] The repulsion mechanism includes a rechargeable opening coil and a closing coil, and a repulsion disk located between the two and driven by the electromagnetic force generated by the energization of the two coils.

[0012] The permanent magnet mechanism includes a permanent magnet, a permanent magnet coil, a stationary iron core that surrounds 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 force generated by the permanent magnet coil being energized in the forward and reverse directions eliminates or strengthens the magnetic force of the permanent magnet, causing the moving iron core to move away from or closer to the permanent magnet.

[0013] The drive shaft runs through the repulsion mechanism and the permanent magnet mechanism, and moves up and down synchronously with the repulsion disk and the moving iron core, thereby driving the moving contact to close or open with the stationary contact.

[0014] Furthermore, the permanent magnet mechanism also includes pole shoes, with the permanent magnet surrounding the outside of the pole shoes. The stationary iron core has a receiving groove, and the permanent magnet coil is disposed in the receiving groove. The outer wall of the stationary iron core wraps around the permanent magnet and the pole shoes.

[0015] Furthermore, the permanent magnet mechanism also includes a gate-opening spring, which is sleeved on the drive shaft and limited between the pole shoe and the moving iron core.

[0016] Furthermore, the permanent magnet mechanism also includes an upper end cover, a bushing, and a lower end cover. The stationary iron core is connected to the upper end cover, and the moving iron core, bushing, and lower end cover are sequentially arranged on the lower side of the stationary iron core.

[0017] Furthermore, the repulsive force mechanism is disposed on the upper or lower side of the permanent magnet mechanism.

[0018] Furthermore, the bottom of the drive shaft is detachably connected to the tripping buffer mechanism.

[0019] Furthermore, the circuit breaker also includes an overtravel adjustment mechanism, which is an overtravel adjustment rod. Its upper end is threadedly connected to an insulating pull rod, and its lower end is threadedly connected to a drive shaft. The threads at the upper and lower ends are in opposite directions. The insulating pull rod is connected to the moving contact of the vacuum interrupter.

[0020] Furthermore, the circuit breaker also includes a secondary signal transmission component, which includes a signal auxiliary transmission structure, an auxiliary switch, a secondary air plug outlet elbow, and a secondary air plug. The signal auxiliary transmission structure connects the drive shaft and the auxiliary switch. The opening and closing status of the circuit breaker is collected through the auxiliary switch and the secondary air plug outlet elbow and transmitted to the secondary air plug.

[0021] Furthermore, the signal-assisted transmission structure includes a connector, a connecting plate, and a switching crank arm. The connector is fixed to the upper end of the drive shaft and moves up and down synchronously with the drive shaft. The connecting plate is mounted on a connecting plate mounting bracket to form a seesaw structure. The switching crank arm is rotatably mounted on an auxiliary switch mounting bracket. One end of the connecting plate is slidably connected to the connector, and the other end is slidably connected to one end of the switching crank arm. One end of the switching crank arm is connected to the contact of the auxiliary switch.

[0022] Furthermore, the circuit breaker also 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.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The circuit breaker of this utility model 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 consistent with mainstream products in the industry, making it widely adaptable and convenient for widespread market application.

[0025] 2. The circuit breaker of this utility model combines electromagnetic repulsion drive technology with permanent magnet holding technology, has very few moving parts, extremely low failure rate, fast switching speed, and ensures no bouncing when closing and long service life.

[0026] 3. The circuit breaker of this utility model has an opening time of less than 4ms, a high opening and closing speed, meets the requirements of sensitive industrial loads, and improves the power quality of the power system.

[0027] 4. The overtravel adjustment structure of the circuit breaker of this utility model is simple and convenient, and does not require the use of a special endoscope. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the overall assembly of the circuit breaker according to Embodiment 1 of this utility model.

[0029] Figure 2 is a side sectional view of Figure 1.

[0030] Figure 3 is a schematic diagram of the circuit breaker according to Embodiment 1 of this utility model.

[0031] Figure 4 is a schematic diagram of the installation of the operating mechanism according to Embodiment 1 of this utility model.

[0032] Figure 5 is a cross-sectional view of the operating mechanism in the open state of Embodiment 1 of this utility model.

[0033] Figure 6 is a cross-sectional view of the operating mechanism in the closed state according to Embodiment 1 of this utility model.

[0034] Figure 7 is an exploded view of the repulsion mechanism of this utility model.

[0035] Figure 8 is an exploded view of the permanent magnet mechanism of this utility model.

[0036] Figure 9 is a cross-sectional view of Figure 8.

[0037] Figure 10 is a cross-sectional view of the overtravel adjustment rod of this utility model.

[0038] Figure 11 is an exploded view of the signal-assisted transmission structure of this utility model.

[0039] Figure 12 is a cross-sectional view of the operating mechanism in the closed state of Embodiment 2 of this utility model.

[0040] Among them: 1. Frame; 1-1. Door; 1-2. Wheel frame; 1-3. Frame cover plate;

[0041] 2. Promoting organizations;

[0042] 3. Chassis;

[0043] 4. Contact arms and contacts;

[0044] 5. Solid-sealed pole; 5-1. Insulating tie rod;

[0045] 6. Repulsion mechanism; 6-1. Opening coil; 6-2. Repulsion disc; 6-2-1. Copper repulsion disc; 6-2-2. Aluminum repulsion disc; 6-3. Closing coil; 6-4. Support sleeve;

[0046] 7. Permanent magnet mechanism; 7-1. Upper end cover; 7-2. Permanent magnet; 7-3. Pole shoe; 7-4. Permanent magnet coil; 7-5. Stationary iron core; 7-6. Bushing; 7-7. Opening spring; 7-8. Moving iron core; 7-9. Lower end cover;

[0047] 8. Drive shaft; 8-1. Upper drive shaft; 8-2. Lower drive shaft; 8-3. Bushing;

[0048] 9. Long bolts;

[0049] 10. Energy storage capacitor;

[0050] 11. Intelligent control unit;

[0051] 12. Overtravel adjustment lever;

[0052] 13. Oil buffer;

[0053] 14. Oil buffer mounting bracket;

[0054] 15. Secondary flight insertion line turn;

[0055] 16. Secondary flight insertion;

[0056] 17. Auxiliary switch; 17-1. Auxiliary switch mounting bracket;

[0057] 18. Connecting plate; 18-1. Round hole in connecting plate; 18-2. Waist hole in connecting plate; 18-3. Connecting plate mounting bracket;

[0058] 19. Connector; 19-1. Connector waist hole;

[0059] 20. Switch the crank arm. Detailed Implementation

[0060] The specific embodiments of this utility model will be further explained below with reference to the accompanying drawings. Example 1

[0061] As shown in Figures 1-11, a medium- and high-voltage fast circuit breaker mainly includes a frame 1, a propulsion mechanism 2, a housing 3, primary conductive components, an operating mechanism, an overtravel adjustment mechanism, a tripping buffer mechanism, secondary signal transmission components, an energy storage capacitor 10, and an intelligent control unit 11.

[0062] The propulsion mechanism 2 and the housing 3 are mounted on the frame 1. Multiple sets of primary conductive components are arranged above the housing 3. The primary conductive components serve as the main electrical circuit of the circuit breaker and include contact arms and contacts 4 and solid-sealed poles 5. Vacuum interrupters and insulating pull rods 5-1 are installed in the solid-sealed poles 5. The vacuum interrupter includes a stationary 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 overtravel adjustment mechanism on the lower side. The operating mechanism is installed inside the frame 1 and the housing 3. A valve 1-1 and a wheel frame 1-2 are installed on the left and right sides of the frame 1. The valve 1-1 is used to cooperate with the interlocking structure inside the electrical cabinet, and the wheel frame 1-2 facilitates the movement of the entire circuit breaker. The propulsion mechanism 2 is used to rock the entire circuit breaker in and out of the electrical cabinet.

[0063] The contact state of the stationary and moving contacts of the vacuum interrupter in the solid-sealed pole 5 determines whether the circuit breaker is closed or open. That is, when the stationary and moving contacts are pressed together, the circuit breaker is in the closed state; and when the stationary and moving contacts are separated, the circuit breaker is in the open state.

[0064] The circuit breaker includes a test position and a working position. In the test position, the circuit breaker is just moved into the electrical cabinet, and the contact arm and contact 4 are not in contact with the stationary contact inside the electrical cabinet, so the electrical system cannot form a complete circuit. In the working position, the pushing mechanism 2 pushes the circuit breaker into the electrical cabinet, and the contact arm and contact 4 engage with the stationary contact inside the electrical cabinet, thus meeting the working prerequisites. The circuit breaker is in the working position and in the closed state, and the primary conductive component is connected to the electrical system to form a complete circuit, that is, the circuit breaker is connected to the electrical system and is working.

[0065] The operating mechanism includes a repulsion mechanism 6, a permanent magnet mechanism 7, and a drive shaft 8. The repulsion mechanism 6 and the permanent magnet mechanism 7 are arranged vertically and are respectively installed in the frame 1 and the housing 3. Their vertical positions can be freely arranged. The drive shaft runs vertically through the center of both from top to bottom. The repulsion mechanism 6 mainly serves as the driving unit for opening and closing the circuit breaker, and the permanent magnet mechanism 7 mainly serves as the holding unit for opening and closing the circuit breaker.

[0066] In this embodiment, the repulsion mechanism 6 is disposed on top and the permanent magnet mechanism 7 is disposed on the bottom, that is, the repulsion mechanism 6 is disposed inside the chassis 3 and the permanent magnet mechanism 7 is disposed inside the frame 1.

[0067] The drive shaft 8 runs vertically from top to bottom through the center of the repulsion mechanism 6 and the permanent magnet mechanism 7. It includes an upper drive shaft 8-1 and a lower drive shaft 8-2, which are threaded together. The upper end of the upper drive shaft 8-1 is threaded for connection and fixation with the overtravel adjustment mechanism or the insulating pull rod 5-1. When the operating mechanism drives the circuit breaker to close or open, the insulating pull rod 5-1 is lifted to close the circuit breaker and pulled down to open the circuit breaker, thereby realizing the closing and opening movement of the circuit breaker. The lower end of the lower drive shaft 8-2 is detachably connected to the opening buffer mechanism.

[0068] The upper drive shaft 8-1 passes through the upper repulsion mechanism 6 and the lower permanent magnet mechanism 7, and the lower drive shaft 8-2 passes through the lower permanent magnet mechanism 7 and the upper repulsion mechanism 6. The two shafts meet at the moving iron core of the permanent magnet mechanism 7 and are connected by threads.

[0069] The drive shaft 8 can be configured as a single unit, but it is designed as a two-section unit, which facilitates the assembly of parts. For example, the stop 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 stop spring 7-7 is then positioned 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.

[0070] The repulsion mechanism 6 is located on the upper side of the permanent magnet mechanism 7. The repulsion mechanism 6 includes a trip coil 6-1, a closing coil 6-3 and a repulsion disk 6-2. The trip coil 6-1 and the closing coil 6-3 are arranged vertically and vertically, with a fixed distance between them using a support sleeve 6-4. The repulsion disk 6-2 is movably arranged between them.

[0071] The permanent magnet mechanism 7 is located on the lower side of the repulsion 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 stationary iron core 7-5, a bushing 7-6, a gate opening spring 7-7, a moving iron core 7-8, and a lower end cover 7-9.

[0072] Specifically, the upper 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 clearance grooves, the size of which is adapted to the repulsion mechanism 6 and the permanent magnet mechanism 7, so that the two can be fixedly connected to form a whole.

[0073] The permanent magnet 7-2 surrounds the outside of the pole shoe 7-3. The permanent magnet 7-2 is not suitable for repeated impacts. The attraction of the permanent magnet 7-2 is conducted through the pole shoe 7-3. The stationary iron core 7-5 has a ring of receiving grooves. The permanent magnet coil 7-4 is placed in the receiving grooves. At the same time, the outer wall of the stationary iron core 7-5 wraps around the permanent magnet 7-2 and the pole shoe 7-3 until the stationary 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 stationary iron core 7-5 form a whole, which constitutes the "permanent magnet static structure" in the permanent magnet mechanism 7 whose position is always relatively fixed.

[0074] The moving iron core 7-8, bushing 7-6, and lower end cover 7-9 are sequentially arranged on the lower side of the stationary iron core 7-5. The bushing 7-6 is placed between the stationary iron core 7-5 and the lower end cover 7-9 to adjust the distance between the stationary iron core 7-5 and the lower end cover 7-9. The three components form a whole and constitute the "permanent magnet moving structure" in the permanent magnet mechanism 7, which can move up and down relative to the permanent magnet "stationary structure".

[0075] The bottom surface of the pole shoe 7-3 has a downwardly protruding cylindrical boss at its center. The bottom surface of the stationary iron core 7-5 has a stationary iron core hole for clearance. The top surface of the moving iron core 7-8 has an upwardly protruding cylindrical boss that matches the cylindrical boss of the pole shoe. In addition to a through hole for mounting the drive shaft 8, the center of the cylindrical bosses of the pole shoe and the moving iron core also has a groove for accommodating the deceleration spring 7-7. The deceleration spring 7-7 is sleeved on the drive shaft 8 and is confined 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.

[0076] Because the trip spring 7-7 is located 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 attraction, and the trip spring 7-7 is compressed to store energy for the next trip. When the circuit breaker switches from the closed state to the open state, the magnetic attraction that the moving iron core 7-8 was originally subjected to disappears and it moves downward. The trip spring 7-7 resets and releases energy, accelerating the downward movement of the moving iron core 7-8.

[0077] The upper drive shaft 8-1 is fixedly connected to the repulsion 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 and the repulsion disk 6-2 are threaded together and the two are completely fixed by riveting and sealing the ends of the repulsion disk. After the two shafts are threaded together at the intersection, they are fixed to the moving iron core 7-8 with thread glue. Thus, the upper drive shaft 8-1, the repulsion disk 6-2, the lower drive shaft 8-2, and the moving iron core 7-8 are relatively fixed and can move up and down synchronously. That is to say, when the drive shaft 8 moves up and down, it drives the repulsion disk 6-2 and the moving iron core 7-8 to move up and down synchronously, and vice versa.

[0078] In addition, to facilitate the flexible rotation of the upper drive shaft 8-1 and the lower drive shaft 8-2, bushings 8-3 are respectively provided at the center of the pole shoe 7-3, the upper end cover 7-1 and the lower end cover 7-9, and the bushings 8-3 are respectively fitted on the outside of the upper drive shaft 8-1 and the lower drive shaft 8-2.

[0079] To ensure the stability of the circuit breaker equipment, long bolts 9 are symmetrically installed on the operating mechanism, passing through the trip coil 6-1, support sleeve 6-4, closing coil 6-3, upper end cover 7-1, and lower end cover 7-9 from top to bottom, fixing the repulsion mechanism 6 and the permanent magnet mechanism 7 into a whole.

[0080] The permanent magnet 7-2 is wrapped around the outside of the pole shoe 7-3, and the attraction of the permanent magnet 7-2 is conducted through the pole shoe 7-3. The "permanent magnet static structure" fixes the relative positions of the permanent magnet 7-2, the pole shoe 7-3, the permanent magnet coil 7-4 and the static iron core 7-5. The main function of the permanent magnet coil 7-4 is to generate the effect of canceling or strengthening the magnetic field of the permanent magnet 7-2 at the moment the permanent magnet coil 7-4 is energized.

[0081] The permanent magnet coil 7-4 has two energizing directions:

[0082] If the circuit breaker is energized in the positive direction when it is open, a magnetic field opposite to that of the permanent magnet 7-2 is generated, which cancels the magnetic field of the permanent magnet 7-2 itself. At this time, the permanent magnet 7-2 and the pole shoe 7-3 have no magnetic attraction to the moving iron core 7-8. 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 closed state to the open state.

[0083] Conversely, when the circuit is closed, it is energized in the opposite direction, generating a magnetic field in the same direction as the permanent magnet 7-2, which strengthens the magnetic attraction generated by the permanent magnet 7-2. As a result, the moving iron core 7-8 is attracted from the state away from the pole shoe 7-3 and moves upward toward the pole shoe 7-3, thereby driving the lower drive shaft 8-2 to move upward, that is, changing from the open state to the closed state.

[0084] It should be noted that the energization of the permanent magnet coil 7-4 is an instantaneous pulse signal. After the permanent magnet coil 7-4 is de-energized, it immediately returns to its normal state of no power, and the permanent magnet 7-2 also returns to its normal magnetic field state.

[0085] It should be noted that in this embodiment, the repulsion disk 6-2 includes a copper repulsion disk 6-2-1 and an aluminum repulsion disk 6-2-2. The aluminum repulsion disk 6-2-2 is located at the center, and the copper repulsion disk 6-2-1 is arranged concentrically around the upper surface of the aluminum repulsion disk 6-2-2. Because it is only arranged on the upper surface of the aluminum repulsion disk 6-2-2, rather than on both the upper and lower surfaces, an asymmetric copper-aluminum composite repulsion disk is formed. The inner diameter of the repulsion disk 6-2-1 is the same as or slightly larger than the inner diameter of the trip coil 6-1. When the circuit is tripped, the induced eddy current is distributed in the copper area on the surface of the repulsion disk. At the same time, a thickened annular structure is provided at the center of the aluminum repulsion 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 repulsion disk caused by electromagnetic repulsion.

[0086] Compared to a repulsion disk made of a single copper material, the copper-aluminum asymmetric composite repulsion disk made of both copper and aluminum has the following advantages: 1. Under the same size conditions, the copper-aluminum asymmetric composite repulsion disk of this embodiment has a smaller mass and higher strength than the copper repulsion disk. Therefore, under the action of approximately the same magnitude of electromagnetic repulsion force, it obtains a higher acceleration and has less vibration deformation, thereby increasing the opening speed of the electromagnetic repulsion mechanism, reducing the rigid opening time, effectively avoiding the huge deformation of the repulsion disk made of a single copper material, increasing its mechanical strength, and improving the reliability of operation; 2. Under the same size conditions, the copper-aluminum asymmetric composite repulsion disk of this embodiment has a higher conductivity in the eddy current region and a larger induced eddy current than the aluminum repulsion disk, thereby obtaining a larger electromagnetic repulsion force and improving the driving efficiency of the electromagnetic repulsion mechanism.

[0087] The tripping buffer mechanism is located 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 mounted in the frame 1 through the oil buffer mounting bracket 14, and the upper side is detachably connected to the lower drive shaft 8-2. That is, during the tripping process, the lower drive shaft 8-2 moves downward and presses against the oil buffer 13, effectively buffering the kinetic energy of the tripping impact and reducing the rebound of the operating mechanism during tripping. However, during the closing process, the lower drive shaft 8-2 moves upward and disengages from the oil buffer 13, no longer making contact.

[0088] The intelligent control unit 11 and the energy storage capacitor 10 are both housed inside the chassis 3. The energy storage capacitor 10 includes a closing capacitor and a opening capacitor, which are connected to the closing coil 6-3, the opening coil 6-1, and the permanent magnet coil 7-4, respectively, and release electrical energy as needed. In fact, the energy storage capacitor is a capacitor bank, including 4 capacitors, which are connected in sequence to the closing circuit of the closing coil, the opening coil, and the permanent magnet coil, and the opening circuit of the permanent magnet coil. The intelligent control unit 11 is used to control the charging and discharging of the energy storage capacitor 10. When it issues a closing or opening control command (the command is a pulse signal, i.e., short-lived), the corresponding capacitor releases electrical energy. During non-operational periods, it charges the energy storage capacitor 10 to prepare for the next discharge.

[0089] The overtravel adjustment mechanism is an overtravel adjustment rod 12, which is set in the overtravel adjustment area on the housing 3. Its upper end is threaded to the insulating pull rod 5-1 connected to the moving contact in the vacuum interrupter chamber, and its lower end is threaded to the upper drive shaft 8-1. The threads at the upper and lower ends are opposite in direction, so that when the overtravel adjustment rod 12 is rotated, its upper and lower ends can be shortened or lengthened at the same time.

[0090] Correspondingly, the overtravel adjustment area is equipped with an adjustment window. When overtravel needs to be adjusted, the circuit breaker is adjusted to the open position (when the circuit breaker is closed, the moving iron core 7-8 and the pole shoe 7-3 are attracted together, and the drive shaft 8 cannot be rotated). The overtravel adjustment rod 12 is rotated through the adjustment window by a wrench. That is, the overtravel is controlled by adjusting the depth of the thread at the lower end of the insulating pull rod 5-1 into the overtravel adjustment rod 12. After the adjustment is in place, the window can be closed.

[0091] The advantages of this setup are: the adjustment process is intuitive and convenient, and the overtravel range can be precisely controlled. No endoscope is required; different specifications of circuit breakers can be adapted simply by using the overtravel adjustment rod 12, resulting in significant economic benefits.

[0092] The secondary signal transmission component mainly includes an auxiliary switch 17, a signal auxiliary transmission structure, a secondary aviation connector outgoing bend 15, and a secondary aviation connector 16. The auxiliary switch 17 is equipped with contacts and multiple sets of contacts, and transmits the circuit breaker's opening and closing status to the secondary aviation connector 16 via wires for use by the downstream system.

[0093] In this embodiment, the circuit breaker's lead wire bundle is led out from the side of the chassis 3 via the secondary aviation connector elbow 15 and then into the secondary aviation connector 16 hanging on the rack 1 through a flexible hose.

[0094] In addition, to facilitate the accurate transmission of electrical signals from the circuit breaker during the closing and opening switching process by the secondary connector 16 and auxiliary switch 17, a signal auxiliary transmission structure is also provided, housed within the chassis 3, including a connector 19, a connecting plate 18, and a switching crank arm 20; the connector 19 is fixed to the upper end of the upper drive shaft 8-1 and moves synchronously up and down with the upper drive shaft 8-1; the connector 19 is provided with a connector waist hole 19-1 for slidably connecting to one end of the connecting plate 18; the connecting plate 18 The middle part is movably mounted on the connecting plate mounting bracket 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 connecting head waist hole 19-1 through a connecting pin. The other end is provided with a connecting plate waist hole 18-2, which is slidably connected to one end of the switching crank arm 20. The auxiliary switch 17 is mounted and fixed by the auxiliary switch mounting bracket 17-1. The middle part of the switching crank arm 20 is rotatably mounted on the auxiliary switch mounting bracket 17-1. One end of the switching crank arm 20 is provided with a square hole for connecting to the contact of the auxiliary switch 17, and the other end is provided with a crank arm protrusion for slidably connecting to the connecting plate round hole 18-1 of the connecting plate 18.

[0095] As shown in Figure 4, the solid line indicates that the signal auxiliary transmission structure is in the open state, and the dashed line indicates that the signal auxiliary transmission structure is in the closed state.

[0096] During the process of switching the circuit breaker from closed to open in this embodiment:

[0097] (1) The working process of the operating mechanism is as follows:

[0098] At this time, the initial state of the circuit breaker is closed (i.e., the moving and stationary contacts of the vacuum interrupter are closed), the repulsion plate 6-2 contacts the upper trip coil 6-1, there is magnetic attraction between the moving iron core 7-8 and the pole shoe 7-3, and the trip spring 7-7 is in a compressed state.

[0099] When tripping is required, the intelligent control unit 11 issues a tripping control command, and the energy storage capacitor 10 releases the corresponding electrical energy, energizing the tripping coil 6-1 of the repulsion mechanism 6 and the permanent magnet coil 7-4 of the permanent magnet mechanism 7.

[0100] On one hand, the trip coil 6-1 is energized. The trip coil 6-1 generates a magnetic field above the repulsion disk 6-2 due to the energization, which generates induced eddy currents and produces a downward pulse electromagnetic repulsion force, pushing the repulsion disk 6-2 to move downward. The repulsion disk 6-2 drives the upper drive shaft 8-1 to move downward until it contacts the closing coil 6-3.

[0101] On the other hand, since the permanent magnet coil 7-4 of the permanent magnet mechanism 7 is energized in the positive direction, it generates a magnetic field opposite to that of the permanent magnet 7-2, which cancels the magnetic field generated by the permanent magnet 7-2. The magnetic attraction between the moving iron core 7-8 and the pole shoe 7-3, which was originally in the closed state, disappears. The moving iron core 7-8 breaks away from the contact with the pole shoe 7-3 and moves downward. The opening spring 7-7 is released from the compressed state and rebounds, accelerating the downward movement of the moving iron core 7-8.

[0102] Under the combined downward movement of the repulsion 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. In turn, the overtravel adjustment rod 12 on the upper side of the upper drive shaft 8-1 drives the insulating pull rod 5-1 to move downward, thereby realizing the separation of the moving and stationary contacts of the vacuum interrupter and completing the opening action.

[0103] At the same time, as the lower drive shaft 8-2 moves downward, it presses down on the oil buffer 13, effectively buffering the kinetic energy of the tripping impact and reducing the rebound when the moving and stationary contacts trip.

[0104] (2) The working process of the signal-assisted transmission structure is as follows:

[0105] As shown in Figure 4, during the tripping process, the upper drive shaft 8-1 moves downward, causing the connector 19 to move downward synchronously, which in turn causes 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 connector waist hole 19-1, and the crank arm protrusion slides to the right side of the connecting plate waist hole 18-2, which in turn causes the switching crank arm 20 to rotate counterclockwise. The switching crank arm 20, through the contacts of the auxiliary switch 17, causes the auxiliary switch 17 to switch from the closed to the open state, and then transmits the tripping-related electrical signals to the secondary aviation connector 16.

[0106] During the process of switching the circuit breaker from open to closed in this embodiment:

[0107] (1) The working process of the operating mechanism is as follows:

[0108] At this time, the initial state of the circuit breaker is the open state (that is, the moving and stationary contacts of the vacuum interrupter are separated). The repulsion plate 6-2 contacts the closing coil 6-3 on the lower side. The moving iron core 7-8 is separated from the pole shoe 7-3 and there is no magnetic attraction. The opening spring 7-7 is in an uncompressed state.

[0109] 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, energizing the closing coil 6-3 of the repulsion mechanism 6 and the permanent magnet coil 7-4 of the permanent magnet mechanism 7.

[0110] On one hand, the closing coil 6-3 is energized, and the closing coil 6-3 generates a magnetic field below the repulsion disk 6-2, which generates induced eddy currents and produces an upward pulse electromagnetic repulsion force, which pushes the repulsion disk 6-2 to move upward. The repulsion disk 6-2 then drives the upper drive shaft 8-1 to move upward until it contacts the opening coil 6-1.

[0111] On the other hand, the permanent magnet coil 7-4 of the permanent magnet mechanism 7 is energized in the opposite direction, generating a magnetic field in the same direction as the permanent magnet 7-2, which strengthens the magnetic field generated by the permanent magnet 7-2. The moving iron core 7-8 changes from having no magnetic attraction to being attracted by an upward magnetic force and moves upward until it contacts the pole shoe.

[0112] Under the combined upward movement of the repulsion 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, which in turn drives the insulating pull rod 5-1 to lift upward through the overtravel adjustment rod 12, thereby closing the moving and stationary contacts of the vacuum interrupter. Furthermore, the magnetic attraction between the moving iron core 7-8, the permanent magnet 7-2, and the pole shoe 7-3 ensures that the three remain in contact, thus maintaining the closed action of the moving and stationary contacts of the vacuum interrupter.

[0113] During the closing process, the rebound 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; in addition, the opening spring 7-7 also plays a role in buffering the closing impact during the upward attraction 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 stationary contacts in the vacuum interrupter chamber; 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 stationary contacts.

[0114] As the lower drive shaft 8-2 moves upward, it disengages from the oil buffer 13 and there is no contact.

[0115] (2) The working process of the signal-assisted transmission structure is as follows:

[0116] As shown in Figure 4, the upward movement of the upper drive shaft 8-1 drives the connector 19 upward synchronously, which in turn 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 connector waist hole 19-1, and the crank arm protrusion slides to the left side of the connecting plate waist hole 18-2, thereby driving the switching crank arm 20 to rotate clockwise. The switching crank arm 20, through the contacts of the auxiliary switch 17, drives the auxiliary switch 17 to switch from the open to the closed state, thereby transmitting the closing-related electrical signals to the secondary aviation connector 16. Example 2

[0117] As shown in Figure 12, the main difference between Embodiment 2 and Embodiment 1 is that the repulsion mechanism 6 and the permanent magnet mechanism 7 of the operating mechanism remain unchanged, while the repulsion mechanism 6 is moved down to the lower side of the permanent magnet mechanism 7, that is, the permanent magnet mechanism 7 is on top and the repulsion mechanism 6 is on the bottom. The repulsion mechanism 6 is set at the bottom of the lower cover plate 7-9. Both are set in the frame 1 through the upper cover plate. At the same time, the installation structure of the upper drive shaft 8-1, the lower drive shaft 8-2 and the repulsion mechanism 6 and the permanent magnet mechanism 7 remains unchanged. The change is that the bottom end of the lower drive shaft 8-2 is now facing upward and connected to the overtravel adjustment rod 12 on the upper side. 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 is now facing downward and can be detachably connected to the oil buffer 13 of the lower trip buffer mechanism.

[0118] Since the entire operating mechanism has been moved downwards, it is only necessary to adjust the corresponding lengths of the upper drive shaft 8-1 and the lower drive shaft 8-2 to adapt to the connection with other mechanisms.

[0119] When the circuit breaker needs to be opened, 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 opening coil 6-1 of the repulsion mechanism 6. The permanent magnet coil 7-4 is positively energized, which cancels 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 opening spring 7-7 rebounds and accelerates downward, driving the moving iron core 7-8, which in turn drives the lower drive shaft 8-2 to move downward until it contacts the lower end cover 7-9. The opening coil 6-1 generates a downward pulse electromagnetic repulsion force, which pushes the repulsion disk 6-2 to move downward, which in turn drives the upper drive shaft 8-1 to move 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 against the oil buffer 13, completing the opening action.

[0120] Conversely, when the circuit breaker needs to be closed, 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 repulsion mechanism 6. The permanent magnet coil 7-4 is energized in the reverse direction, which strengthens the magnetic field generated by the permanent magnet 7-2. The moving iron core 7-8 moves upward under magnetic attraction until it contacts the pole shoe, which drives the lower drive shaft 8-2 to move upward. Meanwhile, the closing coil 6-3 generates an upward pulse electromagnetic repulsion force, which pushes the repulsion disk 6-2 to move upward, and then drives the upper drive shaft 8-1 to move upward until it contacts the opening coil 6-1. The lower drive shaft 8-2 and the upper drive shaft 8-1 move upward at the same time, and through the overtravel adjustment rod 12 and the insulating pull rod 5-1, the moving contact and the stationary contact are pressed together, completing the closing action.

[0121] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A medium-high voltage fast circuit breaker, comprising a stationary contact and a moving contact within a vacuum interrupter chamber, and an operating mechanism connected to the moving contact, characterized in that, The operating mechanism includes: a repulsion mechanism (6), comprising a rechargeable opening coil (6-1) and a closing coil (6-3), and a repulsion disk (6-2) located between the two and driven by the electromagnetic force generated by the energization of the two respectively; a permanent magnet mechanism (7), comprising a permanent magnet (7-2), a permanent magnet coil (7-4), a stationary iron core (7-5) enclosing the permanent magnet (7-2) and the permanent magnet coil (7-4), and a moving iron core (7-8) that can move up and down relative to the permanent magnet (7-2). The electromagnetic force generated by the forward and reverse energization of the permanent magnet coil (7-4) eliminates or strengthens the magnetic force of the permanent magnet (7-2), causing the moving iron core (7-8) to move away from or close to the permanent magnet (7-2); and a drive shaft (8), which 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 driving the moving contact to close or open with the stationary contact.

2. The medium-high voltage fast circuit breaker according to claim 1, characterized in that, The permanent magnet mechanism (7) also includes a pole shoe (7-3), the permanent magnet (7-2) is wrapped around the outside of the pole shoe (7-3), the stationary iron core (7-5) is provided with a receiving groove, the permanent magnet coil (7-4) is placed in the receiving groove, and the outer wall of the stationary iron core (7-5) wraps the permanent magnet (7-2) and the pole shoe (7-3).

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

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

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

6. A medium-high voltage fast circuit breaker according to claim 1, characterized in that, The bottom of the drive shaft (8) is detachably connected to the tripping buffer mechanism.

7. A medium-high voltage fast circuit breaker according to claim 1, characterized in that, The circuit breaker also includes 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 is threadedly connected to the drive shaft (8). The threads at the upper and lower ends are in opposite directions. The insulating pull rod (5-1) is connected to the moving contact of the vacuum interrupter.

8. A medium-high voltage fast circuit breaker according to claim 1, characterized in that, The circuit breaker also includes a secondary signal transmission component, which includes a signal auxiliary transmission structure, an auxiliary switch (17), a secondary air plug outlet bend (15), and a secondary air plug (16). The signal auxiliary transmission structure connects the drive shaft (8) and the auxiliary switch (17). The opening and closing status of the circuit breaker is collected through the auxiliary switch (17) and the secondary air plug outlet bend (15) and transmitted to the secondary air plug (16).

9. A medium-high voltage fast circuit breaker according to claim 8, characterized in that, The signal-assisted transmission structure includes a connector (19), a connecting plate (18), and a switching crank 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 the connecting plate mounting bracket (18-3) to form a seesaw structure. The switching crank arm (20) is rotatably mounted on the auxiliary switch mounting bracket (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 crank arm (20). One end of the switching crank arm (20) is connected to the contact of the auxiliary switch (17).

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

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