A magnetic control mechanism, a high voltage circuit breaker and a control method thereof

Abstract

The present application provides a magnetic control mechanism, a high-voltage circuit breaker and a control method thereof, wherein the magnetic control mechanism comprises a moving iron core, a static iron core, a trip spring, a coil assembly and a guide rod; the opposite surfaces of the moving iron core and the static iron core are respectively provided with a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is provided with a trip spring, the coil assembly is located in the second accommodating cavity, and the coil assembly comprises at least one main coil and at least one compensation coil; one end of the guide rod is connected to the bottom of the first accommodating cavity of the moving iron core, and the other end passes through the first accommodating cavity of the trip spring and the static iron core in sequence. By passing current into the main coil and the compensation coil to adjust the electromagnetic attraction, the two cooperate with each other to realize the adaptive access of the magnetic control mechanism in different circuit breakers, obtain ideal mechanism action characteristics, meet the requirements for the moving contact movement speed in different arc extinguishing chambers, and meet the requirements for contact pressure of different moving and static contact materials.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage circuit breaker equipment, and in particular to a magnetic control mechanism, a high-voltage circuit breaker and a control method thereof. Background Art

[0002] High-voltage circuit breakers are a type of power control equipment widely used in substations. They have arc extinguishing properties and play a role in controlling, regulating and protecting the power system. Their reliability and adaptability have a great impact on the stability of the power system. At present, in the operating mechanism of high-voltage circuit breakers, the magnetic control mechanism has the advantages of a small number of parts, fast switching speed, low energy loss, and high control accuracy. It is a new mechanism with good application prospects. However, in the face of different arc extinguishing chamber structures and different contact materials, the existing single-coil control method has been difficult to meet the requirements.

[0003] For different arc extinguishing chamber structures, the speed of movement of the moving and static contacts that can be accepted is different. At present, the magnetic control mechanism only relies on a single set of coils around the moving and static iron cores. In order to adapt to different moving and static contact movement speeds, it is necessary to change the charging voltage of the corresponding closing and opening capacitors to adapt to different arc extinguishing chamber structures. This method not only has low control efficiency, but also poor safety. For different contact materials, under the premise of maintaining good contact and not deforming and damaging, the corresponding contact pressure is different. At present, the magnetic control mechanism cannot flexibly adapt to the change of contact pressure by relying on a single set of coils. For this reason, there is an urgent need for a high-voltage circuit breaker that can be applied to different arc extinguishing chamber structures and different contact materials to achieve stable, safe and efficient control of the circuit breaker. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a magnetic control mechanism, a high voltage circuit breaker and a control method thereof, which specifically adopts the following technical solutions:

[0005] The present application discloses a magnetic control mechanism for controlling the switching action of a high-voltage circuit breaker, wherein the magnetic control mechanism comprises a moving iron core, a stationary iron core, a trip spring, a coil assembly and a guide rod;

[0006] The moving iron core and the static iron core are arranged opposite to each other, and the opposite surfaces of the moving iron core and the static iron core are respectively provided with a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is provided with a trip spring, and the two ends of the trip spring are respectively abutted against the bottom of the first accommodating cavity of the moving iron core and the static iron core; when the moving iron core moves relative to the static iron core and abuts against it, the moving iron core and the static iron core are in a closed state; when the moving iron core moves away from the static iron core and separates, the moving iron core and the static iron core are in an open state;

[0007] One end of the guide rod is connected to the bottom of the first accommodation cavity of the moving iron core, and the other end passes through the opening spring and the first accommodation cavity of the static iron core in sequence;

[0008] The coil assembly is located in the second accommodating cavity of the moving iron core and the static iron core, and the coil assembly includes at least one main coil and at least one compensation coil, the main coil is connected in parallel to the closing capacitor or the opening capacitor, and the compensation coil is connected to a constant current source.

[0009] Optionally: when the moving iron core and the stationary iron core are in a closed state, a portion of the coil assembly is located in the second accommodating cavity of the moving iron core, and the remaining portion of the coil assembly is located in the second accommodating cavity of the stationary iron core.

[0010] Optionally: an insulating pull rod is provided at the end of the first accommodating cavity extending from the static iron core in the guide rod, and one end of the insulating pull rod is fixedly connected to the guide rod.

[0011] Optional: A moving contact and a stationary contact cooperating with the moving contact are provided at the other end of the insulating pull rod, wherein a contact pressure spring is provided between the moving contact and the insulating pull rod, and the contact pressure spring is used to adjust the contact pressure between the moving and stationary contacts to increase the contact area between the moving and stationary contacts, and when the moving contact and the stationary contact are closed, the contact pressure spring is compressed.

[0012] Optionally: the charging voltage of the closing capacitor is higher than the charging voltage of the opening capacitor, and the current passing through the main coil when the moving iron core and the static iron core are in the closed state is greater than the current passing through the main coil when they are in the open state.

[0013] Optionally, the current value when the constant current source discharges the compensation coil is 10-20% of the current value when the closing capacitor discharges the main coil.

[0014] Optionally, the moving iron core and the static iron core are both made of moment magnetic material.

[0015] At the same time, the present application also discloses a high-voltage circuit breaker, which includes the magnetic control mechanism as described above.

[0016] The present application further discloses a control method for a high-voltage circuit breaker, wherein the control method is used for closing a high-voltage circuit breaker, and the method comprises the following steps:

[0017] When the moving iron core and the static iron core are closed, the closing capacitor discharges to the main coil, and the constant current source discharges to the compensation coil. The induced magnetic fields generated by the main coil and the compensation coil are superimposed, so that the moving iron core and the static iron core are magnetized and generate suction;

[0018] The moving iron core overcomes the spring force of the opening spring and moves relative to the static iron core. At the same time, the moving iron core drives the insulating rod and the moving contact to move in the same direction.

[0019] When the moving contact moves to the stationary contact position, the moving contact and the stationary contact are closed. At this time, the closing capacitor stops discharging, and the constant current source continues to discharge the compensation coil. The compensation coil generates an induced magnetic field and causes the moving iron core and the stationary iron core to continue to be magnetized and attracted.

[0020] The moving iron core continues to move toward the stationary iron core, and the contact pressure spring is continuously compressed until the moving iron core and the stationary iron core are attracted and contacted. At this time, the magnetic force between the moving iron core and the stationary iron core is stable, and the closing is completed.

[0021] The present application also discloses a control method for a high-voltage circuit breaker, wherein the control method is used for opening a high-voltage circuit breaker, and the method comprises the following steps:

[0022] When the moving iron core and the stationary iron core are disconnected, the disconnection capacitor discharges the main coil, and the constant current source discharges the compensation coil. At this time, the current direction in the main coil and the compensation coil is opposite to the current direction when the switch is closed. The reverse induced magnetic fields induced by the main coil and the compensation coil are superimposed, demagnetizing the moving iron core and the stationary iron core.

[0023] During the demagnetization process of the moving iron core and the static iron core, when the magnetic force between the moving iron core and the static iron core is less than the sum of the elastic forces of the opening spring and the contact pressure spring, a gap is generated between the moving iron core and the static iron core;

[0024] As the gap between the moving iron core and the static iron core gradually increases, the magnetic force between the moving iron core and the static iron core gradually disappears, and the opening spring and the contact pressure spring continue to push the moving iron core and the static iron core to further separate;

[0025] The moving iron core drives the insulating pull rod to move away from the static iron core until the moving contact is separated from the static contact. At this time, the opening spring continues to push the moving iron core and the static iron core to further separate;

[0026] The opening is completed when the distance between the moving iron core and the static iron core reaches the preset upper limit distance.

[0027] Beneficial Effects

[0028] The technical solution of this application has the following beneficial effects:

[0029] (1) The high-voltage circuit breaker of the present application is provided with a main coil and a compensation coil. By respectively designing the magnitude and direction of the current flowing through the main coil and the compensation coil during the closing and opening processes, the two can cooperate with each other to realize the adaptive connection of the magnetic control mechanism in different circuit breakers, obtain ideal mechanism action characteristics, meet the requirements for the movement speed of the moving contact in different arc extinguishing chambers, and meet the requirements for the contact pressure of different moving and static contact materials.

[0030] (2) The magnetic control mechanism in the present application is provided with a contact pressure spring under the moving contact, so that the moving and static contacts can collide directly without buffering. The structure is simple and reliable. By adjusting the overtravel distance of the moving contact, the bouncing caused by the collision of the moving and static contacts in different circuit breakers can be reduced, and the contact pressure between the moving and static contacts can be ensured to be stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the closed state of the magnetic control mechanism in the embodiment of the present application.

[0032] Figure 2 It is a structural schematic diagram of the open state of the magnetic control mechanism in the embodiment of the present application.

[0033] Figure 3 It is a schematic flow chart of a method for controlling a high-voltage circuit breaker to close in an embodiment of the present application.

[0034] Figure 4 It is a schematic flow chart of a method for controlling a high-voltage circuit breaker to open in an embodiment of the present application.

[0035] Figure 5 Schematic diagram of the circuit principle of the control loop in the controller in the embodiment of the present application.

[0036] Figure 6 Schematic diagram of the circuit principle of the main coil loop in the embodiment of the present application.

[0037] Figure 7 Schematic diagram of the driving circuit principle of the MOSFET in the main coil loop in the embodiment of the present application.

[0038] Figure 8 Schematic diagram of the circuit principle of the compensation coil loop in the embodiment of the present application.

[0039] The specific meanings of the reference numerals in the accompanying drawings:

[0040] 1-static iron core; 2-moving iron core; 3-opening spring; 4-main coil; 5-compensating coil; 6-guide rod; 7-insulating pull rod; 8-24V switching power supply; 9-optical coupler drive module; 10-main coil circuit; 11-current limiting resistor; 12-closing capacitor; 13-opening capacitor; 14-DC-DC isolation chip; 15-constant current drive chip; 16-compensating coil circuit. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Therefore, it should be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present application.

[0042] In the description of the present invention, it is to be understood that the terms "comprise" and "include" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms of "one", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0044] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0045] Since the magnetic control mechanism in the traditional high-voltage circuit breaker has only one excitation coil, the action characteristics of the operating mechanism are related under the same capacitor charging voltage. Once the capacitor charging voltage is adjusted to meet the action speed condition, it is likely to lose sight of one thing while focusing on another, resulting in the contact pressure between the contacts not meeting the requirements. Therefore, whether the magnetic control mechanism has wide adaptability affects the adaptability of the high-voltage circuit breaker. The present application optimizes the control scheme of the magnetic control mechanism, by adding a set of compensation coils on the basis of the main coil, and by adjusting the current passing through the compensation coil while the current flowing through the main coil remains unchanged, so as to change the magnetic field generated by the superposition of the two coils, thereby adaptively adapting to different arc extinguishing chambers and different contact materials, thereby improving the adaptability of the magnetic control mechanism and facilitating the rapid introduction of the magnetic control mechanism in different arc extinguishing chambers.

[0046] Specifically, the present application discloses a magnetic control mechanism, which is suitable for performing switching actions on different high-voltage circuit breakers. The magnetic control mechanism includes a moving iron core 2, a stationary iron core 1, a trip spring 3, a coil assembly and a guide rod 6.

[0047] As shown in the figure, the moving iron core 2 and the static iron core 1 are arranged opposite to each other, and the opposite surfaces of the moving iron core 2 and the static iron core 1 are respectively provided with a first accommodating cavity and a second accommodating cavity, the first accommodating cavity is provided with a trip spring 3, and the two ends of the trip spring 3 are respectively abutted against the bottom of the first accommodating cavity of the moving iron core 2 and the static iron core 1; the coil assembly is located in the second accommodating cavity of the moving iron core and the static iron core, and the coil assembly includes at least one main coil 4 and at least one compensation coil 5, the main coil 4 is connected in parallel to the closing capacitor or the opening capacitor, and the compensation coil 5 is connected to a constant current source.

[0048] It should be understood that by discharging the compensation coil 5 with a constant current source and discharging the main coil 4 with a capacitor, a superimposed magnetic field of the two coils can be obtained. Under the action of the superimposed magnetic field, the dynamic and static iron cores can be quickly magnetized or demagnetized. It should be noted that in the present application, both the dynamic and static iron cores are made of moment magnetic materials, which are easy to adjust their magnetic properties, and the current required for magnetization is much smaller than that of permanent magnetic materials. They also have high hardness, and do not require additional buffering links when closing the switch. The structure is simple and reliable, and the closing can be directly collided. By adjusting the overtravel movement distance, micro-bounce can be achieved when closing the switch.

[0049] The dual-coil structure in the present application, i.e. the main coil 4 and the compensation coil 5, is the core of the adaptability of the magnetron mechanism. The main coil 4 can be discharged by using the closing and opening capacitors. The magnetic field generated by the large current flowing through the main coil plays a major role in closing and opening the gate. The compensation coil 5 is powered by a constant current source, and the current passing through it is relatively small, generally accounting for only 10-20% of the current in the main coil. Therefore, the compensation coil mainly fine-tunes the action characteristics of the mechanism and plays a major role in improving the adaptability of the mechanism.

[0050] In the present application, when the moving iron core 2 moves relative to the static iron core 1 and abuts against it, the moving iron core 2 and the static iron core 1 are in a closed state; when the moving iron core 2 moves away from the static iron core 1 and separates, the moving iron core 2 and the static iron core 1 are in an open state; it should be noted that one end of the guide rod 6 described in the present application is connected to the bottom of the first accommodating cavity of the moving iron core 2, and the other end passes through the first accommodating cavity of the opening spring 3 and the static iron core 1 in sequence; when the moving and static iron cores are magnetized to generate suction and the suction overcomes the elastic force of the opening spring 3, the moving iron core 2 will move in the direction relative to the static iron core 1, and the guide rod 6 connected to the moving iron core 2 will move with it to complete the closing operation; and when the magnetic properties of the moving and static iron cores are demagnetized by the coil with reverse current flowing, the suction between the two is difficult to overcome the elastic force of the opening spring 3, and the moving iron core 2 and the static iron core 1 are separated, and the guide rod 6 connected to the moving iron core 2 will separate accordingly to complete the opening operation.

[0051] It should be noted that in the present application, when the moving iron core 2 and the stationary iron core 1 are in the closed state, a portion of the coil assembly is located in the second accommodating cavity of the moving iron core 2 , and the remaining portion of the coil assembly is located in the second accommodating cavity of the stationary iron core 1 . It should be understood that in the present application, when the coil is energized to generate a magnetic field, in order to ensure that both the moving iron core 2 and the static iron core 1 are affected by the coil magnetic field to generate an induced magnetic field, only a part of the coil assembly is placed on the static iron core 1. When the magnetic control mechanism changes from the open state to the closed state, after the coil assembly is energized, the induced magnetic field of the moving iron core 2 is stronger, while the induced magnetic field of the static iron core 1 is weakly affected by the distance. However, the moving iron core 2 and the static iron core 1 are attracted to each other by the magnetic attraction, the induced magnetic field of the static iron core 1 gradually becomes stronger, and the magnetic attraction between the two increases; and when the magnetic control mechanism changes from the closed state to the open state, after the coil assembly is reversely energized, the moving iron core 2 and the static iron core 1 are both demagnetized by the coil magnetic field. By controlling the current intensity and duration in the pre-set coil assembly, the magnetism of the moving iron core 2 and the static iron core 1 can be reduced to the weakest, and then the opening spring 3 is used to separate the two.

[0052] An insulating pull rod 7 is provided at the end of the first accommodating cavity extending from the static iron core 1 in the guide rod 6, and one end of the insulating pull rod 7 is fixedly connected to the guide rod 6; the other end of the insulating pull rod 7 is provided with a moving contact and a static contact cooperating with the moving contact, and the insulating pull rod 7 is connected to the moving contact in the vacuum arc extinguishing chamber to achieve transmission and voltage isolation; the moving contact and static contact described in the embodiment of the present application adopt a separable structure, and both are sealed in the vacuum arc extinguishing chamber, when the moving iron core 2 and the static iron core 1 are in the closed state, the moving contact is closed with the static contact; and when the moving iron core 2 and the static iron core 1 are in the open state, the moving contact is separated from the static contact.

[0053] It should be noted that in this application, since the moving and static cores in the magnetron mechanism are both made of high-hardness magnetic heads made of magnetron materials, the moving and static cores can collide directly without contact buffering. If you want to reduce the bounce between the moving and static cores when closing the switch, you can adjust the overtravel length and contact pressure standard accordingly. The overtravel length can be changed by adjusting the mechanical structure, and the contact pressure can be changed by adjusting the coil current and spring specifications. A contact pressure spring is provided between the moving contact and the insulating pull rod 7. The main function of the contact pressure spring is to be compressed when the moving contact moves overtravel, which is beneficial to adjust the contact pressure between the moving and static contacts and to increase the contact area between the moving and static contacts. When the moving contact is engaged with the static contact, the contact pressure spring is compressed.

[0054] It should be understood that due to the influence of the opening spring 3 in the present application, the current passing through the main coil 4 when closing the switch is much greater than the current passing through the main coil 4 when opening the switch. When closing the switch, the moving and static iron cores are magnetized in the magnetic field generated by the coil current, and the two attract each other. The moving iron core 2 needs to overcome the elastic force of the opening spring 3 to move upward, and the opening spring 3 accumulates energy; when opening the switch, the moving and static iron cores are demagnetized in the magnetic field generated by the reverse current of the excitation coil, and the magnetic force between the two gradually disappears. When the elastic force of the opening spring 3 is greater than the magnetic force between the two, the moving and static iron cores are quickly separated to complete the opening. And it is manifested in the charging voltage, that is, the charging voltage of the closing capacitor is higher than the charging voltage of the opening capacitor. At this time, when the moving iron core 2 and the static iron core 1 are in the closing state, the current passing through the main coil 4 is greater than the current passing through the main coil 4 when they are in the opening state.

[0055] In addition, the action process of the magnetron mechanism in the present application is controlled by a controller, wherein the controller is provided with a coil loop and a control loop, such as Figure 5 As shown, the control circuit mainly includes a 24V switching power supply 8 and an optical coupler drive module 9. In the embodiment of the present application, four sets of optical coupler drive modules 9 are provided, which respectively control two relays K_CL+, K_OP+ and drive two MOSFET switch tubes Q4G, Q2G. The coil circuit includes a main coil circuit and a compensation coil circuit, wherein Figure 6 As shown, the main coil loop includes a main coil line 10, a current limiting resistor 11, a closing capacitor 12 and an opening capacitor 13, wherein the current commutation in the coil loop is achieved by changing the MOSFET connected in the H-type full-bridge circuit. Specifically, as Figure 7 As shown, the MOSFET driving of the main coil loop in the present application is mainly realized by the DC-DC isolation chip 14. Further, as Figure 8 As shown, the compensation coil loop includes a constant current driving chip 15 and a compensation coil circuit 16. In order to make a constant current flow through the compensation coil circuit, it is driven by the constant current driving chip 15.

[0056] It should be noted that the embodiment of the present application is based on the above-mentioned magnetic control mechanism, and also discloses a high-voltage circuit breaker using the above-mentioned magnetic control mechanism, which realizes the current on-off process control of the high-voltage circuit breaker through the above-mentioned magnetic control mechanism.

[0057] In addition, the present application discloses a control method for a high-voltage circuit breaker using the above-mentioned magnetic control mechanism, wherein the control method is used for closing the high-voltage circuit breaker, such as Figure 3 As shown, the method comprises the following steps:

[0058] When the moving iron core and the static iron core are closed, the closing capacitor discharges to the main coil, and the constant current source discharges to the compensation coil. The induced magnetic fields generated by the main coil and the compensation coil are superimposed, so that the moving iron core and the static iron core are magnetized and generate suction;

[0059] The moving iron core overcomes the spring force of the opening spring and moves relative to the static iron core. At the same time, the moving iron core drives the insulating rod and the moving contact to move in the same direction.

[0060] When the moving contact moves to the stationary contact position, the moving contact and the stationary contact are closed. At this time, the closing capacitor stops discharging, and the constant current source continues to discharge the compensation coil. The compensation coil generates an induced magnetic field and causes the moving iron core and the stationary iron core to continue to be magnetized and attracted.

[0061] The moving iron core continues to move toward the stationary iron core, and the contact pressure spring is continuously compressed until the moving iron core and the stationary iron core are attracted and contacted. At this time, the magnetic force between the moving iron core and the stationary iron core is stable, and the closing is completed.

[0062] Furthermore, the present application discloses another control method for a high-voltage circuit breaker, wherein the control method is used for opening a high-voltage circuit breaker, such as Figure 4 As shown, the method comprises the following steps:

[0063] When the moving iron core and the stationary iron core are disconnected, the disconnection capacitor discharges the main coil, and the constant current source discharges the compensation coil. At this time, the current direction in the main coil and the compensation coil is opposite to the current direction when the switch is closed. The reverse induced magnetic fields induced by the main coil and the compensation coil are superimposed, demagnetizing the moving iron core and the stationary iron core.

[0064] During the demagnetization process of the moving iron core and the static iron core, when the magnetic force between the moving iron core and the static iron core is less than the sum of the elastic forces of the opening spring and the contact pressure spring, a gap is generated between the moving iron core and the static iron core;

[0065] As the gap between the moving iron core and the static iron core gradually increases, the magnetic force between the moving iron core and the static iron core gradually disappears, and the opening spring and the contact pressure spring continue to push the moving iron core and the static iron core to further separate;

[0066] The moving iron core drives the insulating pull rod to move away from the static iron core until the moving contact is separated from the static contact. At this time, the opening spring continues to push the moving iron core and the static iron core to further separate;

[0067] The opening is completed when the distance between the moving iron core and the static iron core reaches the preset upper limit distance.

[0068] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A magnetic control mechanism for controlling the switching action of a high voltage circuit breaker, characterized in that: The magnetic control mechanism includes a moving iron core, a static iron core, a trip spring, a coil assembly and a guide rod; The moving iron core and the static iron core are arranged opposite to each other, and the opposite surfaces of the moving iron core and the static iron core are respectively provided with a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is provided with a trip spring, and the two ends of the trip spring are respectively abutted against the bottom of the first accommodating cavity of the moving iron core and the static iron core; when the moving iron core moves relative to the static iron core and abuts against it, the moving iron core and the static iron core are in a closed state; when the moving iron core moves away from the static iron core and separates, the moving iron core and the static iron core are in an open state; One end of the guide rod is connected to the bottom of the first accommodation cavity of the moving iron core, and the other end passes through the opening spring and the first accommodation cavity of the static iron core in sequence; The coil assembly is located in the second accommodating cavity of the moving iron core and the stationary iron core, and the coil assembly includes at least one main coil and at least one compensation coil, the main coil is connected in parallel to the closing capacitor or the opening capacitor, and the compensation coil is connected to a constant current source; when the moving iron core and the stationary iron core are in the closing state, a part of the coil assembly is located in the second accommodating cavity of the moving iron core, and the remaining part of the coil assembly is located in the second accommodating cavity of the stationary iron core; An insulating pull rod is provided at the end of the first accommodating cavity extending from the static iron core in the guide rod, and one end of the insulating pull rod is fixedly connected to the guide rod; a moving contact and a static contact cooperating with the moving contact are provided at the other end of the insulating pull rod, wherein a contact pressure spring is provided between the moving contact and the insulating pull rod, and the contact pressure spring is used to adjust the contact pressure between the moving and static contacts to increase the contact area between the moving and static contacts, and when the moving contact and the static contact are closed, the contact pressure spring is compressed; When the moving iron core and the stationary iron core are closed, the closing capacitor discharges the main coil, and the constant current source discharges the compensation coil. The induced magnetic fields generated by the main coil and the compensation coil are superimposed, so that the moving iron core and the stationary iron core are magnetized and generate suction; when the moving contact moves to the stationary contact position, the moving contact and the stationary contact are closed, at which time the closing capacitor stops discharging, and the constant current source continues to discharge the compensation coil. The compensation coil generates an induced magnetic field and causes the moving iron core and the stationary iron core to continue to be magnetized and attracted; When the moving iron core and the static iron core are opened, the opening capacitor discharges the main coil, and the constant current source discharges the compensation coil. At this time, the current direction in the main coil and the compensation coil is opposite to the current direction when the switch is closed. The reverse induced magnetic fields induced by the main coil and the compensation coil are superimposed to demagnetize the moving iron core and the static iron core.

2. The magnetron mechanism according to claim 1, characterized in that: The charging voltage of the closing capacitor is higher than the charging voltage of the opening capacitor, and the current passing through the main coil when the moving iron core and the static iron core are in the closing state is greater than the current passing through the main coil when they are in the opening state.

3. The magnetron mechanism according to claim 1, characterized in that: The current value when the constant current source discharges the compensation coil is 10-20% of the current value when the closing capacitor discharges the main coil.

4. The magnetron mechanism according to claim 1, characterized in that: The moving iron core and the static iron core are both made of moment magnetic material.

5. A high voltage circuit breaker, characterized in that: The high-voltage circuit breaker includes a magnetic control mechanism as described in any one of claims 1-4.

6. A control method for the high voltage circuit breaker according to claim 5, characterized in that: The control method comprises the following steps: When the moving iron core and the static iron core are closed, the closing capacitor discharges to the main coil, and the constant current source discharges to the compensation coil. The induced magnetic fields generated by the main coil and the compensation coil are superimposed, so that the moving iron core and the static iron core are magnetized and generate suction; The moving iron core overcomes the spring force of the opening spring and moves relative to the static iron core. At the same time, the moving iron core drives the insulating rod and the moving contact to move in the same direction. When the moving contact moves to the stationary contact position, the moving contact and the stationary contact are closed. At this time, the closing capacitor stops discharging, and the constant current source continues to discharge the compensation coil. The compensation coil generates an induced magnetic field and causes the moving iron core and the stationary iron core to continue to be magnetized and attracted. The moving iron core continues to move toward the stationary iron core, and the contact pressure spring is continuously compressed until the moving iron core and the stationary iron core are attracted and contacted. At this time, the magnetic force between the moving iron core and the stationary iron core is stable, and the closing is completed.

7. A control method for the high voltage circuit breaker according to claim 5, characterized in that: The control method comprises the following steps: When the moving iron core and the stationary iron core are disconnected, the disconnection capacitor discharges the main coil, and the constant current source discharges the compensation coil. At this time, the current direction in the main coil and the compensation coil is opposite to the current direction when the switch is closed. The reverse induced magnetic fields induced by the main coil and the compensation coil are superimposed, demagnetizing the moving iron core and the stationary iron core. During the demagnetization process of the moving iron core and the static iron core, when the magnetic force between the moving iron core and the static iron core is less than the sum of the elastic forces of the opening spring and the contact pressure spring, a gap is generated between the moving iron core and the static iron core; As the gap between the moving iron core and the static iron core gradually increases, the magnetic force between the moving iron core and the static iron core gradually disappears, and the opening spring and the contact pressure spring continue to push the moving iron core and the static iron core to further separate; The moving iron core drives the insulating pull rod to move away from the static iron core until the moving contact is separated from the static contact. At this time, the opening spring continues to push the moving iron core and the static iron core to further separate; The opening is completed when the distance between the moving iron core and the static iron core reaches the preset upper limit distance.

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