A hybrid direct current circuit breaker based on magnetic integrated repulsion mechanism and working method thereof

Abstract

This invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism and its operating method, including a magnetically integrated repulsive mechanism using a flyback transformer group, a switching operation mechanism, a switching holding mechanism, an insulating pull rod, a moving contact, a stationary contact, and a contact spring; wherein the magnetically integrated repulsive mechanism includes a flyback transformer group composed of flyback transformer T1 and flyback transformer T2; wherein the magnetically integrated repulsive mechanism adopts a transformer group disc structure comprising inner and outer rings, which is jointly composed of the main iron cores of flyback transformer T1 and flyback transformer T2; wherein the main iron core of flyback transformer T2 serves as the inner ring of the transformer group disc structure, and the main iron core of flyback transformer T1 serves as the outer ring of the transformer group disc structure, wherein the inner and outer rings of the transformer group disc structure share a common center, and a hole is left at the center of the flyback transformer T2, which serves as the inner ring.

Description

Technical Field

[0001] This invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism and its operating method, relating to the field of DC circuit breaker technology. Background Technology

[0002] With the development of technologies such as distributed generation, AI factories, electric vehicles, and large-scale energy storage, the urgency and economic efficiency of DC distribution network construction are becoming increasingly prominent. However, DC distribution networks suffer from low damping, lack a natural zero-crossing point for current, and experience current feedback from other branches to the fault point during a fault. These factors lead to rapid fault current rise, high peak values, and complex and variable flow paths, posing a severe challenge to fault protection. Using DC circuit breakers to quickly interrupt faulty lines without affecting the operation of intact lines is an ideal choice for fault protection. However, current DC mechanical, solid-state, and hybrid circuit breakers suffer from problems such as short lifespan, high losses, and slow speed, respectively, failing to meet the protection requirements of DC distribution networks.

[0003] The fundamental reason for the difficulty in interrupting DC faults lies in the difficulty of quickly dissipating the enormous short-circuit energy. Mechanical DC circuit breakers connect an oscillating branch in parallel across the contacts to create an artificial zero-crossing point, thereby reducing the short-circuit energy at the moment of interruption. However, the contact action is difficult to coordinate effectively with the current zero point, which seriously affects the electrical life. Solid-state DC circuit breakers use a parallel connection of power electronic branches and energy dissipation branches, which can achieve microsecond-level interruption and dissipation of short-circuit energy. However, they have high conduction losses and poor overload capacity. Hybrid DC circuit breakers transfer the fault current to the parallel power electronic branch through the action of the mechanical branch, and then to the parallel energy dissipation branch for interruption and dissipation of short-circuit energy. However, their fault interruption time is limited by the mechanical switch and remains at the millisecond level. All three types of DC circuit breakers essentially use an "energy dissipation method" to release short-circuit energy. During the energy dissipation process, the fault current always flows through the main circuit, and the fault can only be interrupted after the energy dissipation is completed. That is, the energy dissipation process and the interruption process are synchronized. This "synchronous energy dissipation" principle of short-circuit energy release restricts the interruption speed of DC circuit breakers. Summary of the Invention

[0004] In view of this, and to fill the gaps and deficiencies in the existing technology, this invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism and its operating method to solve the problems encountered in the background technology. This invention magnetically integrates a double flyback transformer with a repulsion mechanism to form a magnetically integrated repulsion mechanism. The primary side of the double flyback transformer is connected in series with the main circuit. Using the active flyback principle, short-circuit energy is rapidly transferred from the primary side of the transformer to the secondary side and consumed. During this energy consumption process, the fault current does not flow through the main circuit, achieving asynchronous energy consumption and microsecond-level suppression of the short-circuit current. Simultaneously, the transferred short-circuit energy and the actively injected energy cause a surge in the transformer's secondary current. In the repulsion mechanism, the metal repulsion disk induces eddy current repulsion along with the change in coil current, driving the contacts to open rapidly. Through the "flyback transfer, asynchronous energy consumption, and repulsion opening" of short-circuit energy, flexible suppression and rapid isolation of fault current are achieved, improving the performance of the DC circuit breaker.

[0005] This invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism and its operating method, including the following:

[0006] According to a first aspect of the present invention, the present invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism, characterized in that it includes a magnetically integrated repulsive mechanism employing a flyback transformer group, a switching operation mechanism, a switching holding mechanism, an insulating pull rod, a moving contact, a stationary contact, and a contact spring;

[0007] The magnetically integrated repulsive mechanism mentioned above includes a flyback transformer group consisting of flyback transformer T1 and flyback transformer T2;

[0008] The magnetic integrated repulsion mechanism described therein adopts a transformer group disk structure consisting of inner and outer ring disks, which is composed of the main iron core one of the flyback transformer T1 and the main iron core two of the flyback transformer T2.

[0009] The main core of the flyback transformer T2 serves as the inner ring of the transformer group's disc structure, while the main core of the flyback transformer T1 serves as the outer ring of the transformer group's disc structure. The inner and outer rings of the transformer group's disc structure share a common center, and a hole is left at the center of the flyback transformer T2, which serves as the inner ring.

[0010] The magnetic integrated repulsion mechanism further includes a repulsion unit; the repulsion unit includes a metal repulsion disk; the metal repulsion disk is located directly below the transformer group disc structure, and the center of the metal repulsion disk has a hole and is located on the same vertical line as the hole at the center of the transformer group disc structure of the magnetic integrated repulsion mechanism.

[0011] The metal repulsion disk is made of a conductive but non-magnetic material;

[0012] The insulating pull rod, from top to bottom, passes through the hole at the center of the transformer group disc structure, the hole at the center of the metal repulsion disk, the opening and closing operation mechanism, and the opening and closing holding mechanism; and the contact spring at the upper end of the insulating pull rod is connected to the moving contact.

[0013] Furthermore, the flyback transformer T2 and the flyback transformer T1 are separated by a magnetic shielding material; the magnetic shielding material has a cylindrical ring structure; the flyback transformer T1 further includes a primary winding and a secondary winding; the flyback transformer T2 further includes a primary winding and a secondary winding.

[0014] Furthermore, the opening and closing operation mechanism includes a moving iron core, a stationary iron core, and a coil; wherein the center of the moving iron core and the center of the stationary iron core are both provided with holes and are located on the same vertical line.

[0015] Furthermore, the opening and closing holding mechanism includes a bistable spring and a buffer; wherein the bistable spring is fixed above an insulating pull rod, and the bistable spring is spaced apart from the buffer directly below it.

[0016] According to a second aspect of the present invention, the present invention proposes a method for operating a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism, which is executed using a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism as described in any one of the present invention. The method is characterized in that the transformer disk structure in the magnetically integrated repulsion mechanism is used to transfer the impact energy generated by the opening of the hybrid DC circuit breaker from the main circuit to the secondary circuit for dissipation; and the eddy current repulsion force generated during the dissipation process drives the metal repulsion disk of the magnetically integrated repulsion mechanism to move together with the insulating pull rod, thereby realizing the opening of the hybrid DC circuit breaker.

[0017] Furthermore, during operation, the primary winding one and the secondary winding two of the flyback transformer group form the main circuit of the hybrid DC circuit breaker, which is used for closing and conducting the hybrid DC circuit breaker; the primary winding two and the secondary winding two of the flyback transformer group form the energy dissipation circuit of the hybrid DC circuit breaker, which is used to dissipate the impact energy generated by the opening of the hybrid DC circuit breaker.

[0018] Furthermore, during the opening process of the hybrid DC circuit breaker, the external control circuit injects current into the secondary side of the flyback transformers T1 and T2. The primary side current of T1 and T2 is transferred to the secondary side. Under the combined action of the injected current and the transferred current, the secondary side current induces eddy currents on the metal repulsion disk. The generated eddy current repulsion force drives the insulating pull rod to move, thereby realizing the opening.

[0019] Furthermore, during the closing process of the hybrid DC circuit breaker, the coil of the closing electromagnetic operating mechanism is energized, attracting the moving iron core to move. The moving iron core drives the insulating pull rod to realize the closing operation.

[0020] Furthermore, the buffer is used to absorb the remaining kinetic energy of the insulating pull rod at the end of the opening operation, and the bistable spring generates a holding force in the opening or closing direction at the end of the opening or closing operation to achieve steady-state holding of the opening and closing.

[0021] Furthermore, the impact energy includes the electromagnetic energy generated by the short-circuit current when the hybrid DC circuit breaker is tripped; the external control circuit draws power from the main circuit of the hybrid DC circuit breaker, and the primary windings of the flyback transformer T1 and the flyback transformer T2 are energized from the main circuit of the hybrid DC circuit breaker.

[0022] The present invention has the following advantages:

[0023] 1. Through active flyback injection, the short-circuit current can be removed from the main circuit within microseconds and continuously suppressed to a dynamic zero value, which is faster than the breaking time of traditional solid-state circuit breakers (considering energy dissipation time);

[0024] 2. No electronic switches are connected to the main current-carrying circuit, which can achieve low-power continuous bidirectional DC connection. It has strong current-carrying capacity and high reliability. The current changes continuously during operation without overvoltage.

[0025] 3. The dual flyback transformer and the repulsion mechanism are integrated into one unit, sharing the discharge capacitor and magnetic circuit, which realizes the deep integration of the flexible current suppression circuit and the mechanical switch, and the device is compact in size;

[0026] 4. With the opening and closing action of the repulsion disk, the magnetic circuit is not easily saturated, and the transferred short-circuit energy and injected voltage energy can be fully converted into eddy current repulsion, which facilitates rapid fault isolation and reduces the current stress injected into the circuit. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the magnetic integrated repulsion mechanism of the present invention.

[0028] Figure 2 This is a schematic diagram of the overall structure of the hybrid DC circuit breaker based on the magnetically integrated repulsive mechanism of the present invention.

[0029] Figure 3 This is a schematic diagram of the equivalent circuit of the hybrid DC circuit breaker based on the magnetically integrated repulsive mechanism of the present invention.

[0030] Figure 4 This is a schematic diagram of the working waveform of the hybrid DC circuit breaker based on the magnetically integrated repulsive mechanism of the present invention.

[0031] Figure 5 This is a schematic diagram of the winding distribution of the magnetic integrated repulsion mechanism of the present invention.

[0032] Figure 6This is a schematic diagram of the working magnetic flux density distribution of the magnetic integrated repulsion mechanism of the present invention.

[0033] Figure 7 This is a schematic diagram of the opening and closing direction of the hybrid DC circuit breaker based on the magnetic integrated repulsion mechanism of the present invention.

[0034] In the picture:

[0035] 1-Primary winding one; 2-Secondary winding one; 3-Primary winding two; 4-Secondary winding two;

[0036] 5-Metal repulsion disk; 6-Magnetic shielding material; 7-Main iron core one; 8-Main iron core two;

[0037] 9-Insulating pull rod; 10-Contact spring; 11-Moving contact; 12-Stationary contact;

[0038] 13-Opening and closing operating mechanism; 131-Moving iron core; 132-Stationary iron core; 133-Coil;

[0039] 14-Opening and closing holding mechanism; 141-Bistable spring; 142-Buffer. Detailed Implementation

[0040] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] like Figures 1 to 7 As shown, this invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism and its operating method, including the following:

[0044] According to a first aspect of the present invention, the present invention proposes a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism, characterized in that it includes a magnetically integrated repulsive mechanism employing a flyback transformer group, a switching operation mechanism, a switching holding mechanism 14, an insulating pull rod 9, a moving contact, a stationary contact, and a contact spring;

[0045] The magnetically integrated repulsive mechanism mentioned above includes a flyback transformer group consisting of flyback transformer T1 and flyback transformer T2;

[0046] The magnetic integrated repulsion mechanism described therein adopts a transformer group disk structure consisting of inner and outer ring disks, which is composed of the main iron core 7 of the flyback transformer T1 and the main iron core 2 of the flyback transformer T2.

[0047] The main iron core 2 of the flyback transformer T2 serves as the inner ring of the transformer group disc structure, and the main iron core 7 of the flyback transformer T1 serves as the outer ring of the transformer group disc structure. The inner and outer rings of the transformer group disc structure share a common center, and a hole is left at the center of the flyback transformer T2, which serves as the inner ring.

[0048] The magnetic integrated repulsion mechanism further includes a repulsion unit; the repulsion unit includes a metal repulsion disk 5; the metal repulsion disk 5 is located directly below the transformer group disk structure, and the center of the metal repulsion disk 5 has a hole and is located on the same vertical line as the hole at the center of the transformer group disk structure of the magnetic integrated repulsion mechanism.

[0049] The metal repulsion disk 5 is made of a conductive but non-magnetic material;

[0050] The insulating pull rod 9 passes through the hole at the center of the transformer group disc structure, the hole at the center of the metal repulsion disk 5, the opening and closing operation mechanism, and the opening and closing holding mechanism 14 from top to bottom; and the contact spring at the upper end of the insulating pull rod 9 is connected to the moving contact.

[0051] Furthermore, the flyback transformer T2 and the flyback transformer T1 are separated by a magnetic shielding material 6; the magnetic shielding material 6 has a cylindrical ring structure; the flyback transformer T1 further includes a primary winding 1 and a secondary winding 2; the flyback transformer T2 further includes a primary winding 2 and a secondary winding 2 4.

[0052] Furthermore, the opening and closing operation mechanism includes a moving iron core 131, a stationary iron core 132, and a coil 133; wherein the center of the moving iron core 131 and the center of the stationary iron core 132 are both provided with holes and are located on the same vertical line.

[0053] Furthermore, the opening and closing holding mechanism 14 includes a bistable spring and a buffer 142; wherein the bistable spring is fixed above the insulating pull rod 9, and the bistable spring is spaced apart from the buffer 142 below.

[0054] According to a second aspect of the present invention, the present invention proposes a method for operating a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism, which is executed using a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism as described in any one of the present invention. The method is characterized in that the transformer disk structure in the magnetically integrated repulsion mechanism is used to transfer the impact energy generated by the opening of the hybrid DC circuit breaker from the main circuit to the secondary circuit for dissipation; and the eddy current repulsion force generated during the dissipation process drives the metal repulsion disk 5 of the magnetically integrated repulsion mechanism to move together with the insulating pull rod 9, thereby realizing the opening of the hybrid DC circuit breaker.

[0055] Furthermore, during operation, the primary winding 1 and secondary winding 4 of the flyback transformer group form the main circuit of the hybrid DC circuit breaker, which is used for closing and conducting the hybrid DC circuit breaker; the primary winding 2 and secondary winding 2 4 of the flyback transformer group form the energy dissipation circuit of the hybrid DC circuit breaker, which is used to dissipate the impact energy generated by the opening of the hybrid DC circuit breaker.

[0056] Furthermore, during the opening process of the hybrid DC circuit breaker, the external control circuit injects current into the secondary side of the flyback transformers T1 and T2. The primary side current of T1 and T2 is transferred to the secondary side. Under the combined action of the injected current and the transferred current, the secondary side current induces eddy currents on the metal repulsion disk 5. The generated eddy current repulsion force drives the insulating pull rod 9 to move, thereby realizing the opening.

[0057] Furthermore, during the closing process of the hybrid DC circuit breaker, the closing electromagnetic operating mechanism coil 133 is energized, attracting the moving iron core 131 to move. The moving iron core 131 drives the insulating pull rod 9 to realize the closing operation.

[0058] Furthermore, the buffer 142 is used to absorb the remaining kinetic energy of the insulating pull rod 9 at the end of the opening operation, and the bistable spring generates a holding force in the opening or closing direction at the end of the opening or closing operation to achieve steady-state holding of opening and closing.

[0059] Furthermore, the impact energy includes the electromagnetic energy generated by the short-circuit current when the hybrid DC circuit breaker is tripped; the external control circuit draws power from the main circuit of the hybrid DC circuit breaker, and the primary windings of the flyback transformer T1 and the flyback transformer T2 are energized from the main circuit of the hybrid DC circuit breaker.

[0060] In addition to the above, the present invention also has related embodiments, including the following:

[0061] In one embodiment of the present invention, the opening and closing direction of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism is as follows: Figure 7 As shown.

[0062] Integrated repulsion mechanism structure such as Figure 1As shown: Primary winding 1 and secondary winding 2 are integrated with main core 7 to form flyback transformer T1; primary winding 3 and secondary winding 2 are integrated with the inner disk of the metal repulsion disk of the repulsion mechanism to form flyback transformer T2; the inner and outer disks of the metal repulsion disk are magnetically isolated by magnetically insulating material. When the primary / secondary currents of flyback transformers T1 and T2 change, a magnetic field with a specific path change is generated under the magnetic circuit constraint of the magnetic coil disk. The changing magnetic field induces eddy currents in the metal repulsion disk, thereby exciting the eddy current repulsion force, causing the metal repulsion disk to drive the insulating pull rod 9 to move together, realizing the rapid tripping of the operating mechanism.

[0063] The overall structure of the hybrid DC circuit breaker based on the magnetically integrated repulsion mechanism is as follows: Figure 2 As shown: This magnetically integrated repulsive force mechanism, together with the contacts and springs, the opening and closing operation mechanism 13, and the opening and closing holding mechanism (including the bistable spring 141 and the buffer), forms a complete circuit breaker body, realizing the opening and closing operation of the contact system and maintaining the opening and closing state. During the opening process, a voltage injection circuit injects current into the secondary side of the flyback transformers T1 and T2. The primary side current of T1 and T2 is transferred to the secondary side. Under the combined action of the injected current and the transferred current, the secondary side current surges, inducing eddy currents on the metal disc, instantly generating a huge eddy current repulsive force, driving the insulating pull rod 9 to move rapidly, realizing rapid opening, and can quickly isolate short-circuit faults; during the closing process, the coil 133 of the opening and closing operation mechanism 13 is energized, attracting the moving iron core 131 to move. The moving iron core 131 drives the insulating pull rod 9 to realize the closing operation. The buffer is used to absorb the remaining kinetic energy of the insulating pull rod 9 when the opening operation ends, and the bistable spring 141 generates a holding force in the opening / closing direction when the opening / closing operation ends, so as to achieve steady-state holding of opening and closing.

[0064] The transformer winding distribution of the magnetically integrated repulsive mechanism is as follows: Figure 5 As shown, flyback transformer T1 is a step-up transformer, with its windings distributed in the inner portion of the coil disk. The outer winding is the primary winding 1, and the inner winding is the secondary winding 2. Flyback transformer T2 is a step-down transformer, with its windings distributed in the outer portion of the coil disk. The outer winding is the primary winding 3, and the inner winding is the secondary winding 2. The magnetic flux density distribution of the magnetically integrated repulsive mechanism is as follows: Figure 6 As shown, the magnetic flux density is high in the inner and outer sections of the coil, indicating a high coupling coefficient between the primary and secondary windings of the transformer. However, the magnetic flux density in the magnetically separated section between the inner and outer coils is extremely low, indicating good magnetic isolation between the two transformers.

[0065] The circuit characteristics of the magnetically integrated repulsive mechanism can be equivalent to two variable-parameter flyback transformers, combined with a short-circuit current flexible suppression circuit. Its overall working principle is as follows: Figure 3As shown: C1 is a pre-stored energy capacitor. The equivalent model of the magnetically integrated repulsive mechanism circuit is a variable-parameter flyback transformer T1 and T2. The primary side of the transformer is connected in series with the main circuit and in series with the double-break circuit breaker. The secondary side of the transformer is connected to a flexible short-circuit current suppression circuit. After the turns ratio of T1 and T2 is changed, the voltage of C1 can generate voltages slightly higher and slightly lower than V, respectively. DC The voltage is used for flexible suppression of the primary-side short-circuit current. The main circuit consists of a DC voltage V. DC The transformer consists of the primary winding, moving and stationary contacts, and a faulty load (creating a short circuit). The primary winding voltage of the transformer is u. p The primary current is i p The voltage at the two mechanical contact breaks is u. K / 2, the sum of the contact voltages is u K The primary windings and contact systems of the two flyback transformers T1 and T2 are connected in series and then connected to the DC system circuit. The magnetically integrated repulsive mechanism drives the contact system 11 to perform opening and closing operations through the insulating pull rod 9 connected to the metal disk.

[0066] A schematic diagram of the operating waveform of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism is shown below. Figure 4 As shown: At time t0, a short-circuit fault occurs in the main circuit, and the primary current ip of the flyback transformers T1 and T2 rises rapidly, initially generating eddy current repulsion on the metal disk. However, under the reaction force of the holding mechanism in the opening / closing state, the metal disk does not begin to move; by time t1, the primary current i p When the voltage rises to the fault threshold, the fully controlled secondary rectifier bridges B1 and B2 inject the C1 voltage alternately into the primary side of the flyback transformers T1 and T2, causing it to generate a voltage slightly higher than V in the opposite direction to the current. DC Coupling voltage u p According to the flyback principle, the fault current is forced to transfer to the secondary side of the transformer. Due to the effects of voltage injection and current transfer, the secondary current i of transformers T1 and T2 increases. T1s i T2s The eddy current repulsion on the metal disk surges rapidly, the metal disk begins to move, and the switching phase begins; at time t2, the primary short-circuit current i p The voltage decays to a dynamic zero value (microseconds) to complete fault suppression; thereafter, current closed-loop control is used to maintain the primary-side voltage u. p Slightly greater than and slightly less than V DC The short-circuit current i is rapidly alternating between these states. p The fault is continuously suppressed at a dynamic zero value. During this stage, the eddy current repulsion remains at a relatively large value, and the metal disk accelerates, entering the rapid interruption stage. At time t3, the mechanical contact moves to the maximum opening distance, completing fault isolation. After this, the secondary current i of the flyback transformer... T1s i T2s The secondary current i is fed back to capacitor C1 through body diodes B1 and B2 until time t4. T1s iT2s When the current drops to zero, the power supply ends. The entire process involves short-circuit current suppression via power electronic switches, accompanied by the generation of eddy current repulsion. Finally, the zero-value current is quickly isolated and interrupted through mechanical contacts. Therefore, this topology is classified as a hybrid DC circuit breaker.

[0067] The above are preferred embodiments of the present invention. Any changes made to the technical solution of the present invention that do not exceed the scope of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism, characterized in that, It includes a magnetically integrated repulsive force mechanism using a flyback transformer group, a switching operation mechanism, a switching holding mechanism, an insulating pull rod, a moving contact, a stationary contact, and a contact spring; The magnetically integrated repulsive mechanism mentioned above includes a flyback transformer group consisting of flyback transformer T1 and flyback transformer T2; The magnetic integrated repulsion mechanism described therein adopts a transformer group disk structure consisting of inner and outer ring disks, which is composed of the main iron core one of the flyback transformer T1 and the main iron core two of the flyback transformer T2. The main core of the flyback transformer T2 serves as the inner ring of the transformer group's disc structure, while the main core of the flyback transformer T1 serves as the outer ring of the transformer group's disc structure. The inner and outer rings of the transformer group's disc structure share a common center, and a hole is left at the center of the flyback transformer T2, which serves as the inner ring. The magnetic integrated repulsion mechanism further includes a repulsion unit; the repulsion unit includes a metal repulsion disk; the metal repulsion disk is located directly below the transformer group disc structure, and the center of the metal repulsion disk has a hole and is located on the same vertical line as the hole at the center of the transformer group disc structure of the magnetic integrated repulsion mechanism. The metal repulsion disk is made of a conductive but non-magnetic material; The insulating pull rod, from top to bottom, passes through the hole at the center of the transformer group disc structure, the hole at the center of the metal repulsion disk, the opening and closing operation mechanism, and the opening and closing holding mechanism; and the contact spring at the upper end of the insulating pull rod is connected to the moving contact.

2. A hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 1, characterized in that, The flyback transformer T2 and flyback transformer T1 are separated by a magnetic shielding material; the magnetic shielding material has a cylindrical ring structure; the flyback transformer T1 also includes a primary winding and a secondary winding; the flyback transformer T2 also includes a primary winding and a secondary winding.

3. A hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 1, characterized in that, The opening and closing operation mechanism includes a moving iron core, a stationary iron core, and a coil; the center of the moving iron core and the center of the stationary iron core are both provided with holes and are located on the same vertical line.

4. A hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 1, characterized in that, The opening and closing holding mechanism includes a bistable spring and a buffer; the bistable spring is fixed to the insulating pull rod directly above it, and the bistable spring is spaced apart from the buffer directly below it.

5. A method for operating a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism, wherein the method is implemented using a hybrid DC circuit breaker based on a magnetically integrated repulsion mechanism as described in any one of claims 1 to 4, characterized in that, The transformer disk structure in the magnetically integrated repulsion mechanism is used to transfer the impact energy generated by the opening of the hybrid DC circuit breaker from the main circuit of the hybrid DC circuit breaker to the secondary circuit for dissipation; and the eddy current repulsion force generated during the dissipation process drives the metal repulsion disk of the magnetically integrated repulsion mechanism to move together with the insulating tie rod, thereby realizing the opening of the hybrid DC circuit breaker.

6. The operating method of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 5, characterized in that, During operation, the primary winding one and secondary winding two of the flyback transformer group form the main circuit of the hybrid DC circuit breaker, which is used for closing and conducting the hybrid DC circuit breaker; the primary winding two and secondary winding two of the flyback transformer group form the energy dissipation circuit of the hybrid DC circuit breaker, which is used to dissipate the impact energy generated by the opening of the hybrid DC circuit breaker.

7. The operating method of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 5, characterized in that, During the tripping process of the hybrid DC circuit breaker, an external control circuit injects current into the secondary side of the flyback transformers T1 and T2. The primary side current of T1 and T2 is transferred to the secondary side. Under the combined action of the injected current and the transferred current, the secondary side current induces eddy currents on the metal repulsion disk. The eddy current repulsion force generated drives the insulating pull rod to move, thereby achieving tripping.

8. The operating method of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 5, characterized in that, During the closing process of the hybrid DC circuit breaker, the coil of the closing electromagnetic operating mechanism is energized, attracting the moving iron core to move. The moving iron core drives the insulating pull rod to realize the closing operation.

9. The operating method of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 5, characterized in that, The buffer is used to absorb the remaining kinetic energy of the insulating pull rod when the opening operation ends, and the bistable spring generates a holding force in the opening or closing direction when the opening or closing operation ends, so as to achieve steady-state holding of opening and closing.

10. The operating method of a hybrid DC circuit breaker based on a magnetically integrated repulsive mechanism according to claim 5 or 7, characterized in that, The impact energy includes the electromagnetic energy generated by the short-circuit current when the hybrid DC circuit breaker is tripped; the external control circuit is powered from the main circuit of the hybrid DC circuit breaker, and the primary windings of the flyback transformer T1 and the flyback transformer T2 are powered from the main circuit of the hybrid DC circuit breaker.

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