Electromagnetic repulsion switch with three opening modes

Abstract

The application discloses an electromagnetic repulsion switch with three kinds of opening modes, comprising an arc extinguishing chamber shell, a static contact, a dynamic contact, a bellows, a transmission rod, an electromagnetic repulsion mechanism, a bistable spring holder and a hydraulic buffer. The electromagnetic repulsion mechanism is composed of an opening coil, a moving coil, a closing coil and a discharge circuit, the discharge circuit of each coil comprises a discharge capacitor, a thyristor and a freewheeling diode, the upper and lower ends of the discharge circuit are connected with the outer and inner leads of each coil, and each group of discharge circuits is independent of each other. The electromagnetic repulsion switch can control the corresponding thyristor to switch different opening modes according to the working conditions, thereby reducing the stress and charge-discharge demand of the electromagnetic repulsion switch under the normal-speed opening condition. Meanwhile, the single-capacitor normal-speed driving mode and the double-capacitor rapid driving mode can be used as backup schemes or rapid reclosing schemes, which significantly improves the reliability and mechanical life of the electromagnetic repulsion switch, and makes the electromagnetic repulsion switch applicable to a wider range.

Description

Technical Field

[0001] This invention relates to the field of fast electromagnetic repulsion switch technology for circuit breakers, and in particular to an electromagnetic repulsion switch with multiple opening modes. Background Technology

[0002] Mechanical DC circuit breakers and hybrid DC circuit breakers are preferred solutions for fault isolation in flexible DC power grids. Electromagnetic repulsion switches, as the core components of both, undertake the important tasks of steady-state current carrying and transient voltage bearing. Compared with spring switches and permanent magnet switches, electromagnetic repulsion switches have advantages such as fast operation, low dispersion, and strong breaking capacity. Their working performance and stability directly affect the breaking performance and reliability of the circuit breaker.

[0003] Currently, electromagnetic repulsion switches used in medium and high voltage DC circuit breaker technology typically employ coil-disc or coil-coil structures. Coil-disc repulsion switches are based on electromagnetic induction and eddy current effects, generating electromagnetic repulsion by applying a pulsed current to the coil and inducing a reverse eddy current in the metal disk. Coil-coil repulsion switches have two driving methods: one is the anti-series type, which applies a pulsed current to two coils connected in opposite directions to generate electromagnetic repulsion; the other is the coupling type, which utilizes Lenz's law and Ampere's law. The coupling type generates electromagnetic repulsion by applying a pulsed current to one coil and inducing a reverse current in the other coil. Traditional single-coupled repulsion switches do not offer significant advantages over anti-series and coil-disc repulsion switches, hence related research is limited.

[0004] Furthermore, due to the single opening and closing mode and high opening and closing speed of electromagnetic repulsion switches, the operation process causes a significant impact on the mechanical structure and requires a sufficiently large buffer mechanism. The electromagnetic buffering technology described in patent CN202110705514 can effectively reduce the requirements for the mechanical buffer mechanism, but its operating mode is singular and requires additional buffer capacitors. The permanent magnet and repulsion combination scheme described in patent CN202211525483 can selectively perform both constant-speed and rapid breaking modes, greatly reducing the structural impact force under constant-speed breaking conditions. However, the coil-disc repulsion switch used in this scheme is inefficient and not suitable for designing electromagnetic buffers and bidirectional repulsion mechanisms.

[0005] The above background information is provided only to assist in understanding the concept and technical solution of this invention, and does not necessarily belong to the prior art of this invention. In the absence of clear evidence that the above information was disclosed on the filing date of this invention, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0006] The purpose of this invention is to propose an electromagnetic repulsion switch with three tripping modes to solve the technical problems of the existing electromagnetic repulsion switch, such as the single tripping mode, strong structural impact force under constant speed tripping conditions, and active buffer technology design.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0008] An electromagnetic repulsion switch with three tripping modes includes an arc-extinguishing chamber housing, a stationary contact, a moving contact, a bellows, a transmission rod, an electromagnetic repulsion mechanism, a bistable spring retainer, and a hydraulic buffer; the arc-extinguishing chamber housing, the bistable spring retainer, the electromagnetic repulsion mechanism, and the hydraulic buffer are arranged sequentially from top to bottom;

[0009] The stationary contact is disposed inside the arc-extinguishing chamber housing and is fixedly disposed at the top inside the arc-extinguishing chamber housing;

[0010] The moving contact is positioned directly below the stationary contact. The lower end of the moving contact is fixedly connected to the top of the transmission rod via a bellows. The transmission rod can drive the moving contact to move up and down.

[0011] The two ends of the bellows are fixedly connected to the lower end of the arc-extinguishing chamber shell and the upper end of the transmission rod, respectively. The bellows can elastically expand and contract as the transmission rod moves up and down.

[0012] The bistable spring retainer is fixedly installed on the outside, and the movable end of the bistable spring retainer is connected to the transmission rod through interconnected connecting rods.

[0013] The transmission rod passes through the electromagnetic repulsion mechanism and is fixedly connected to the motion coil, which can drive the transmission rod to move up and down.

[0014] The hydraulic damper is fixedly installed at the bottom of the electromagnetic repulsion switch. When squeezed by the transmission rod, it can gradually suppress the downward movement of the transmission rod.

[0015] The electromagnetic repulsion switch has three opening modes: single capacitor constant speed drive mode, dual capacitor fast drive mode, and three capacitor long acceleration fast drive mode.

[0016] The single-capacitor constant speed drive mode only activates the discharge capacitor of the motion coil, which generates induced current in the opening coil and the closing coil successively, thereby providing electromagnetic driving force and electromagnetic buffering force.

[0017] The dual-capacitor fast drive mode sequentially activates the discharge capacitor of the opening coil and the discharge capacitor of the closing coil, thereby generating induced current in the motion coil and providing electromagnetic driving force and electromagnetic buffering force.

[0018] The three-capacitor long acceleration fast drive mode first activates the discharge capacitor of the opening coil and the discharge capacitor of the motion coil to generate electromagnetic driving force. In the buffer stage, the discharge capacitor of the closing coil is activated to generate an induced current in the motion coil, thereby generating electromagnetic buffer force.

[0019] Furthermore, the single-capacitor constant-speed drive mode and the dual-capacitor fast drive mode can be used as a fast reclosing scheme and a backup scheme for the repulsion switch.

[0020] Furthermore, the electromagnetic repulsion mechanism includes a trip coil and its discharge circuit, a motion coil and its discharge circuit, and a closing coil and its discharge circuit. The three sets of coils are wound in the same direction, all with the transmission rod as the axis. The trip coil and the closing coil are fixedly installed at the top and bottom of the electromagnetic repulsion mechanism, respectively. The motion coil is installed between the trip coil and the closing coil. The three sets of discharge circuits are independent of each other and each includes a discharge capacitor, a thyristor, and a freewheeling diode.

[0021] Furthermore, each of the three sets of coils in the electromagnetic repulsion mechanism has two lead ports, one on the outside and one on the inside of the coil, respectively.

[0022] Furthermore, the discharge circuit of the opening coil of the electromagnetic repulsion mechanism includes a discharge capacitor C1, a thyristor T1, and a freewheeling diode D1; the discharge circuit of the moving coil of the electromagnetic repulsion mechanism includes a discharge capacitor C2, a thyristor T2, and a freewheeling diode D2; and the discharge circuit of the closing coil of the electromagnetic repulsion mechanism includes a discharge capacitor C3, a thyristor T3, and a freewheeling diode D3.

[0023] Furthermore, in the discharge circuit of the trip coil, the positive terminal of the discharge capacitor C1 is connected in series with the anode of the thyristor T1, the cathode of the thyristor T1 is connected to the negative terminal of the freewheeling diode D1 and the upper port of the trip coil, and the negative terminal of the discharge capacitor C1 is connected to the positive terminal of the freewheeling diode D1 and the lower port of the trip coil.

[0024] The positive terminal of the discharge capacitor C2 in the discharge circuit of the moving coil is connected in series with the anode of the thyristor T2, the cathode of the thyristor T2 is connected to the negative terminal of the freewheeling diode D2 and the lower port of the moving coil, and the negative terminal of the discharge capacitor C2 is connected to the positive terminal of the freewheeling diode D2 and the upper port of the tripping coil.

[0025] The positive terminal of the discharge capacitor C3 in the closing coil discharge circuit is connected in series with the anode of the thyristor T3, the cathode of the thyristor T3 is connected to the negative terminal of the freewheeling diode D1 and the upper port of the opening coil, and the negative terminal of the discharge capacitor C3 is connected to the positive terminal of the freewheeling diode D3 and the lower port of the opening coil.

[0026] Furthermore, the electromagnetic repulsion mechanism includes three sets of discharge capacitors. The single-capacitor constant speed driving mode uses only discharge capacitor C2, the dual-capacitor fast driving mode uses discharge capacitors C1 and C3, and the three-capacitor long acceleration fast driving mode requires the use of all capacitor sets. All three driving modes have electromagnetic buffering function.

[0027] Furthermore, in the single-capacitor constant-speed drive mode, the discharge circuit of the motion coil discharges, inducing a reverse current on the trip coil through Lenz's law and generating an electromagnetic repulsion force, thereby driving the transmission rod to move. When approaching the closing coil, the motion coil generates an electromagnetic repulsion force with the closing coil, thereby driving the transmission rod to decelerate.

[0028] Furthermore, in the dual-capacitor fast drive mode, the discharge circuit of the trip coil discharges, inducing a reverse current in the moving coil through Lenz's law and generating an electromagnetic repulsion force, thereby driving the transmission rod to move. When it approaches the closing coil, the discharge circuit of the closing coil discharges, generating an electromagnetic repulsion force between the closing coil and the moving coil, thereby driving the transmission rod to decelerate.

[0029] Furthermore, in the three-capacitor long-acceleration rapid drive mode, the discharge circuits of the trip coil and the motion coil discharge simultaneously. The magnetic fields generated by the currents in the two coils are in opposite directions, thus generating electromagnetic repulsion. The motion coil drives the transmission rod to move. When it approaches the closing coil, the discharge circuit of the closing coil discharges, inducing a reverse current on the motion coil through Lenz's law and generating electromagnetic repulsion, thereby driving the transmission rod to decelerate.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] (1) The present invention proposes an electromagnetic repulsion switch with three opening modes, which realizes three modes in a set of electromagnetic repulsion mechanisms: single capacitor constant speed drive, double capacitor fast drive, and three capacitor long acceleration fast drive.

[0032] (2) The electromagnetic repulsion switch proposed in this invention can control the corresponding thyristor to switch different opening modes according to the working conditions, thereby reducing the stress and charging and discharging requirements of the electromagnetic repulsion switch under normal speed opening conditions. At the same time, the single capacitor normal speed driving mode and the dual capacitor fast driving mode can be used as backup schemes or fast reclosing schemes.

[0033] (3) The electromagnetic repulsion switch proposed in this invention can provide electromagnetic buffering function in all three modes, which can effectively reduce the speed of moving parts at the end of the opening and significantly improve the reliability and mechanical life of the electromagnetic repulsion switch. Attached Figure Description

[0034] Figure 1This is a schematic diagram of the electromagnetic repulsion switch provided by the present invention.

[0035] Figure 2 This is a schematic diagram of the driving phase of the electromagnetic repulsion switch single capacitor constant speed driving mode provided in an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of the buffer stage operation of the single-capacitor constant-speed drive mode of the electromagnetic repulsion switch provided in an embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of the driving stage of the dual-capacitor fast driving mode of the electromagnetic repulsion switch provided in an embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of the buffer stage operation of the dual-capacitor fast drive mode of the electromagnetic repulsion switch provided in an embodiment of the present invention.

[0039] Figure 6 This is a schematic diagram of the driving phase of the electromagnetic repulsion switch three-capacitor long acceleration fast driving mode provided in an embodiment of the present invention.

[0040] Figure 7 This is a schematic diagram of the buffer stage operation of the three-capacitor long acceleration fast drive mode of the electromagnetic repulsion switch provided in an embodiment of the present invention.

[0041] In the figure: 1-arc-extinguishing chamber shell; 2-stationary contact; 3-moving contact; 4-bellows; 5-transmission rod; 6-electromagnetic repulsion mechanism; 61-opening coil; 62-moving coil; 63-closing coil; 7-bistable spring retainer; 71-bistable spring; 72-connecting rod; 8-hydraulic buffer. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope or application of the present invention.

[0043] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0044] Example 1:

[0045] An electromagnetic repulsion switch with three tripping modes, such as Figure 1As shown, the circuit includes an arc-extinguishing chamber housing 1, a stationary contact 2, a moving contact 3, a bellows 4, a transmission rod 5, an electromagnetic repulsion mechanism 6, a tripping coil 61, a moving coil 62, a closing coil 63, a bistable spring retainer 7, a bistable spring 71, a connecting rod 72, and a hydraulic buffer 8. It can be understood that the arc-extinguishing chamber housing 1, the electromagnetic repulsion mechanism 6, the bistable spring retainer 7, and the hydraulic buffer 8 are arranged sequentially from top to bottom. The electromagnetic repulsion mechanism 6 includes the tripping coil 61 and its discharge circuit, the moving coil 62 and its discharge circuit, and the closing coil 63 and its discharge circuit. The three sets of coils are wound in the same direction and are all centered on the transmission rod 5. The tripping coil 61 and the closing coil 63 are fixedly disposed at the top and bottom ends of the electromagnetic repulsion mechanism, respectively. The moving coil 62 is disposed between the tripping coil 61 and the closing coil 63. The three sets of discharge circuits are independent of each other and each includes a discharge capacitor, a thyristor, and a freewheeling diode. The stationary contact 2 is disposed inside the arc-extinguishing chamber housing 1 and fixedly disposed at the top of the arc-extinguishing chamber housing 1. The moving contact 3 is disposed directly below the stationary contact 2. The lower end of the moving contact 3 is fixedly connected to the top of the transmission rod 5 through the bellows 4. The transmission rod 5 can drive the moving contact to move up and down. The two ends of the bellows 4 are fixedly connected to the lower end of the arc-extinguishing chamber housing 1 and the upper end of the transmission rod 5, respectively. The bellows 4 can elastically expand and contract with the up and down movement of the transmission rod 5. The bistable spring retainer 7 is fixedly disposed on the outside. The movable end of the bistable spring 71 is connected to the transmission rod 5 through the connecting rod 72. The transmission rod 5 passes through the electromagnetic repulsion mechanism 6 and is fixedly connected to the motion coil 62. The motion coil 62 can drive the transmission rod 5 to move up and down. The hydraulic buffer 8 is fixedly disposed at the bottom of the electromagnetic repulsion switch. When squeezed by the transmission rod 5, it can gradually suppress the downward movement of the transmission rod.

[0046] The electromagnetic repulsion mechanism 6 has three sets of coils, each with two lead ports, one on the top and one on the bottom, connected to the outer and inner leads of its respective coil. The discharge circuit of the opening coil 61 includes a discharge capacitor C1, a thyristor T1, and a freewheeling diode D1; the discharge circuit of the moving coil 62 includes a discharge capacitor C2, a thyristor T2, and a freewheeling diode D2; and the discharge circuit of the closing coil 63 includes a discharge capacitor C3, a thyristor T3, and a freewheeling diode D3.

[0047] The positive terminal of the discharge capacitor C1 in the discharge circuit of the trip coil 61 is connected in series with the anode of the thyristor T1. The cathode of the thyristor T1 is connected to the negative terminal of the freewheeling diode D1 and the upper port of the trip coil 61. The negative terminal of the discharge capacitor C1 is connected to the positive terminal of the freewheeling diode D1 and the lower port of the trip coil 61. The positive terminal of the discharge capacitor C2 in the discharge circuit of the moving coil 62 is connected in series with the anode of the thyristor T2. The cathode of the thyristor T2 is connected to the negative terminal of the freewheeling diode D2 and the lower port of the moving coil 62. The negative terminal of the discharge capacitor C2 is connected to the positive terminal of the freewheeling diode D2 and the upper port of the moving coil 62. The positive terminal of the discharge capacitor C3 in the discharge circuit of the closing coil 63 is connected in series with the anode of the thyristor T3. The cathode of the thyristor T3 is connected to the negative terminal of the freewheeling diode D1 and the upper port of the trip coil 63. The negative terminal of the discharge capacitor C3 is connected to the positive terminal of the freewheeling diode D3 and the lower port of the trip coil 63.

[0048] Example 2:

[0049] An electromagnetic repulsion switch capable of multi-mode opening and closing, as described above, has three opening modes: single-capacitor constant-speed drive mode, dual-capacitor fast drive mode, and three-capacitor long-acceleration fast drive mode.

[0050] (1) Single capacitor constant speed drive mode. The drive phase is as follows: Figure 2 As shown, the control system issues a command, the thyristor T2 turns on, the discharge capacitor C2 discharges current through the moving coil 62, the trip coil 61 generates a reverse induced current with the moving coil 62 and forms a circuit through the freewheeling diode D1, thereby generating an electromagnetic repulsion force between the moving coil 62 and the trip coil 61 to overcome the holding force of the bistable spring retainer 7 and drive the moving coil 62 to move downward; the buffer phase is as follows Figure 3 As shown, after the discharge capacitor C2 finishes discharging, the remaining charge of the motion coil 62 forms a circuit with the freewheeling diode D2. When the motion coil 62 moves to the closing coil side 63, the closing coil generates an induced current in the opposite direction to the motion coil and forms a circuit through the freewheeling diode D3. This generates an electromagnetic repulsion force between the motion coil 62 and the closing coil 63, which, together with the hydraulic buffer 8, drives the motion coil 62 to decelerate. This mode only requires the use of one set of discharge capacitors to complete the driving and buffering functions of the electromagnetic drive mechanism. The current stress and mechanical stress of the mechanism can be reduced by using capacitors with lower pre-charge voltage.

[0051] (2) Dual-capacitor fast drive mode. The drive phase is as follows: Figure 4As shown, the control system issues a command, the thyristor T1 turns on, the discharge capacitor C1 discharges current through the trip coil, generating a reverse induced current in the motion coil 62, which forms a circuit through the freewheeling diode D2, thereby generating an electromagnetic repulsion force that overcomes the holding force of the bistable spring retainer 7 and drives the motion coil 62 to move downward; the buffer phase is as follows Figure 5 As shown, when the thyristor T3 is turned on, the discharge capacitor C3 discharges current through the closing coil 63, generating a reverse induced current on the moving coil 62, which in turn generates an electromagnetic repulsion force that, together with the hydraulic buffer 8, drives the moving coil 62 to decelerate. In this mode, excitation is applied to the opening coil and the closing coil respectively. Through coupled drive, the mechanism can have a high initial opening drive acceleration and electromagnetic buffer acceleration.

[0052] (3) Three-capacitor long-acceleration fast drive mode. The drive phase is as follows: Figure 6 As shown, the control system issues a command to simultaneously turn on thyristors T1 and T2. Discharge capacitors C1 and C2 discharge to the trip coil 61 and the moving coil 62 respectively. The currents in the two coils are in opposite directions, generating electromagnetic repulsion that overcomes the holding force of the bistable spring retainer 7 and drives the moving coil 62 downwards; the buffering phase is as follows... Figure 7 As shown, when the thyristor T3 is turned on, a reverse induced current is generated in the motion coil 62 through electromagnetic induction and forms a circuit with the freewheeling diode D2, thereby generating an electromagnetic repulsion force that, together with the hydraulic buffer 8, drives the motion coil 62 to decelerate. In this driving phase, two sets of discharge capacitors are used to give the mechanism a higher acceleration and a longer acceleration process. In the buffer phase, a coupled driving form is used to output force faster.

[0053] According to the above-mentioned electromagnetic repulsion switch with three opening modes, its closing operation can use a single capacitor constant speed drive mode, or it can drive only the closing coil discharge circuit or use a dual capacitor fast drive mode.

[0054] According to the above-mentioned electromagnetic repulsion switch with three opening modes, the single-capacitor constant speed drive mode uses only the discharge capacitor C2, the dual-capacitor fast drive mode uses the discharge capacitors C1 and C3, and the three-capacitor long acceleration fast drive mode requires the use of all capacitor groups; the single-capacitor constant speed drive mode and the dual-capacitor fast drive mode of the electromagnetic repulsion mechanism can be used as fast reclosing schemes or alternative schemes.

[0055] According to the aforementioned electromagnetic repulsion switch with three opening and closing modes, the corresponding discharge circuit parameters can be set according to the circuit breaker technical requirements. The single-capacitor constant-speed drive mode can be used for conventional speed interruption; only a single capacitor bank is needed to complete the electromagnetic drive and electromagnetic buffer functions, which helps reduce capacitor power requirements and improve the lifespan of the repulsion switch. The dual-capacitor fast drive mode can be used for fast interruption; different capacitor banks are used in the electromagnetic drive and electromagnetic buffer stages, allowing for flexible design of drive speed and buffering effect, which helps improve the stability of the repulsion switch. The three-capacitor long-acceleration fast drive mode can be used for long-acceleration fast interruption, further improving the drive speed and ensuring good electromagnetic buffering performance, ensuring that the repulsion switch can meet the technical requirements for fast interruption.

[0056] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0057] Although exemplary embodiments of the invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the invention without departing from the central concepts of the invention described herein. Therefore, the invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the invention.

Claims

1. An electromagnetic repulsion switch with three tripping modes, characterized in that: It includes an arc-extinguishing chamber housing, a stationary contact, a moving contact, a bellows, a transmission rod, an electromagnetic repulsion mechanism, a bistable spring retainer, and a hydraulic buffer; the arc-extinguishing chamber housing, the bistable spring retainer, the electromagnetic repulsion mechanism, and the hydraulic buffer are arranged sequentially from top to bottom; The stationary contact is disposed inside the arc-extinguishing chamber housing and is fixedly disposed at the top inside the arc-extinguishing chamber housing; The moving contact is positioned directly below the stationary contact. The lower end of the moving contact is fixedly connected to the top of the transmission rod via a bellows. The transmission rod drives the moving contact to move up and down. The two ends of the bellows are fixedly connected to the lower end of the arc-extinguishing chamber shell and the upper end of the transmission rod, respectively. The bellows elastically expands and contracts as the transmission rod moves up and down. The bistable spring retainer is fixedly installed on the outside, and the movable end of the bistable spring retainer is connected to the transmission rod through interconnected connecting rods. The transmission rod passes through the electromagnetic repulsion mechanism and is fixedly connected to the motion coil. The motion coil drives the transmission rod to move up and down. The hydraulic damper is fixedly installed at the bottom of the electromagnetic repulsion switch, and when it is squeezed by the transmission rod, it inhibits the transmission rod from moving downward. The electromagnetic repulsion mechanism includes a trip coil and its discharge circuit, a motion coil and its discharge circuit, and a closing coil and its discharge circuit. The three sets of coils are wound in the same direction, all with the transmission rod as the axis. The trip coil and the closing coil are fixedly set at the top and bottom of the electromagnetic repulsion mechanism, and the motion coil is set between the trip coil and the closing coil. The three sets of discharge circuits are independent of each other and each includes a discharge capacitor, a thyristor, and a freewheeling diode. The electromagnetic repulsion switch has three opening modes: single capacitor constant speed drive mode, dual capacitor fast drive mode, and three capacitor long acceleration fast drive mode. The single-capacitor constant speed drive mode puts the discharge capacitor of the motion coil into the circuit breaker coil, and successively generates induced current in the opening coil and the closing coil, thereby providing electromagnetic driving force and electromagnetic buffering force. The dual-capacitor fast drive mode sequentially activates the discharge capacitor of the opening coil and the discharge capacitor of the closing coil, thereby generating induced current in the motion coil and providing electromagnetic driving force and electromagnetic buffering force. The three-capacitor long acceleration fast drive mode first activates the discharge capacitor of the opening coil and the discharge capacitor of the motion coil to generate electromagnetic driving force. In the buffer stage, the discharge capacitor of the closing coil is activated to generate an induced current in the motion coil, thereby generating electromagnetic buffer force. The discharge circuit of the opening coil of the electromagnetic repulsion mechanism includes a discharge capacitor C1, a thyristor T1, and a freewheeling diode D1; the discharge circuit of the moving coil of the electromagnetic repulsion mechanism includes a discharge capacitor C2, a thyristor T2, and a freewheeling diode D2; and the discharge circuit of the closing coil of the electromagnetic repulsion mechanism includes a discharge capacitor C3, a thyristor T3, and a freewheeling diode D3. The positive terminal of the discharge capacitor C1 in the discharge circuit of the trip coil is connected in series with the anode of the thyristor T1, the cathode of the thyristor T1 is connected to the negative terminal of the freewheeling diode D1 and the upper port of the trip coil, and the negative terminal of the discharge capacitor C1 is connected to the positive terminal of the freewheeling diode D1 and the lower port of the trip coil. The positive terminal of the discharge capacitor C2 in the discharge circuit of the moving coil is connected in series with the anode of the thyristor T2, the cathode of the thyristor T2 is connected to the negative terminal of the freewheeling diode D2 and the lower port of the moving coil, and the negative terminal of the discharge capacitor C2 is connected to the positive terminal of the freewheeling diode D2 and the upper port of the tripping coil. The positive terminal of the discharge capacitor C3 in the discharge circuit of the closing coil is connected in series with the anode of the thyristor T3, the cathode of the thyristor T3 is connected to the negative terminal of the freewheeling diode D1 and the upper port of the opening coil, and the negative terminal of the discharge capacitor C3 is connected to the positive terminal of the freewheeling diode D3 and the lower port of the opening coil. The single-capacitor constant-speed drive mode and the dual-capacitor fast drive mode can be used as a fast reclosing scheme and a backup scheme for the repulsion switch. In the single-capacitor constant speed drive mode, the discharge circuit of the motion coil discharges, and a reverse current is induced on the opening coil by Lenz's law, which generates an electromagnetic repulsion force and drives the transmission rod to move. When it approaches the closing coil, the motion coil generates an electromagnetic repulsion force with the closing coil, which drives the transmission rod to decelerate. In the dual-capacitor fast drive mode, the discharge circuit of the trip coil discharges, and Lenz's law induces a reverse current in the moving coil and generates an electromagnetic repulsion force, thereby driving the transmission rod to move. When it approaches the closing coil, the discharge circuit of the closing coil discharges, and an electromagnetic repulsion force is generated between the closing coil and the moving coil, thereby driving the transmission rod to decelerate. In the three-capacitor long-acceleration rapid drive mode, the discharge circuits of the trip coil and the motion coil discharge simultaneously. The magnetic fields generated by the currents in the two coils are in opposite directions, thus generating electromagnetic repulsion. The motion coil drives the transmission rod to move. When it approaches the closing coil, the discharge circuit of the closing coil discharges, inducing a reverse current in the motion coil through Lenz's law and generating electromagnetic repulsion, which in turn drives the transmission rod to decelerate.

2. An electromagnetic repulsion switch with three opening modes according to claim 1, characterized in that, The electromagnetic repulsion mechanism has three sets of coils, each with two lead ports, one on the outside and one on the inside of the coil.

3. An electromagnetic repulsion switch with three opening modes according to claim 1, characterized in that, The electromagnetic repulsion mechanism includes three sets of discharge capacitors. The single-capacitor constant speed driving mode uses discharge capacitor C2, the dual-capacitor fast driving mode uses discharge capacitors C1 and C3, and the three-capacitor long acceleration fast driving mode uses all capacitor sets. All three driving modes have electromagnetic buffering function.

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