Circuit breaker system

Abstract

The invention provides a circuit breaker system. The circuit breaker system comprises a moving contact and a static contact, the first electromagnetic assembly comprises a first magnetic part and a first coil, and the first coil is wound on the magnetic memory material part of the first magnetic part; the second electromagnetic assembly is arranged opposite to the first electromagnetic assembly and comprises a second magnetic part and a second coil, the second coil is wound on the magnetic memory material part of the second magnetic part, and one of the first electromagnetic assembly and the second electromagnetic assembly is in driving connection with the moving contact; the first coil and the second coil are connected with current in the same direction for first preset time, the first magnetic part and the second magnetic part attract each other, and after the current in the same direction disappears, the magnetic attraction force between the first magnetic part and the second magnetic part is kept unchanged; and reverse current is introduced into the first coil and the second coil for second preset time, the first magnetic part and the second magnetic part are separated, and after the current in the opposite direction disappears, the magnetic repulsive force between the first magnetic part and the second magnetic part is kept unchanged.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker systems, and in particular to a circuit breaker system. Background Art

[0002] The circuit breaker system is an important protective device for the power system. The circuit breaker system usually includes a switch assembly and a magnetic control mechanism. The switch assembly includes a moving contact and a static contact that cooperate with each other. The moving contact and the static contact are isolated or connected to each other. When the power system operates normally, the moving contact and the static contact are connected to each other. When the power system fails, the moving contact and the static contact are isolated from each other to cut off the current of the power system. The magnetic control mechanism usually includes a static iron core, a moving iron core, a coil and an elastic member. The moving iron core and the static iron core are arranged opposite to each other, and the coil is wound on the moving iron core. One end of the elastic member is connected to the moving iron core, and the other end is connected to the static iron core. The elastic member applies a force to the moving iron core away from the static iron core.

[0003] In the circuit breaker system using this solution, when the power system is in a normal state, the coil needs to be continuously energized to keep the static iron core and the moving iron core in an adsorbed state, and the moving contact and the static contact in a connected state; if the power system fails, the coil needs to be disconnected from the power supply, and the moving iron core and the static iron core are separated under the action of the elastic member, and the moving contact and the static contact are in a separated state. However, the above setting requires continuous power supply to the coil to maintain the adsorbed state of the moving iron core and the static iron core, which consumes a lot of energy. Summary of the invention

[0004] The present invention provides a circuit breaker system to solve the problem in the prior art that in order to maintain the adsorption state of the moving iron core and the stationary iron core, the coil needs to be continuously energized, resulting in high energy consumption.

[0005] The present invention provides a circuit breaker system, comprising: a switch assembly, comprising a moving contact and a stationary contact, the moving contact being connected or separated from the stationary contact; a magnetic control mechanism, comprising a first electromagnetic assembly and a second electromagnetic assembly, the first electromagnetic assembly comprising a first magnetic member and a first coil, at least a portion of the first magnetic member being made of a magnetic memory material, and the first coil being wound around a portion of the magnetic memory material of the first magnetic member; the second electromagnetic assembly being arranged opposite to the first electromagnetic assembly, the second electromagnetic assembly comprising a second magnetic member and a second coil, at least a portion of the second magnetic member being made of a magnetic memory material, and the second coil being wound around a portion of the magnetic memory material of the second magnetic member, the magnetic control mechanism having a closed state and an open state arranged opposite to each other, when the magnetic control mechanism is in the closed state, the first magnetic member and the second magnetic member are attracted to each other; when the magnetic control mechanism is in the open state, the first magnetic member and the second magnetic member are attracted to each other. A magnetic member and a second magnetic member are separated from each other, and one of the first electromagnetic component and the second electromagnetic component is connected to the moving contact to connect or separate the moving contact with the static contact; when the magnetic control mechanism is in an open state, a current in the same direction for a first preset time is passed through the first coil and the second coil, and a magnetic attraction force is generated between the first magnetic member and the second magnetic member until the first magnetic member and the second magnetic member are attracted to each other. After the current in the same direction disappears, the magnetic attraction force between the first magnetic member and the second magnetic member remains unchanged; when the magnetic control mechanism is in an open state, a current in the opposite direction for a second preset time is passed through the first coil and the second coil, and a magnetic repulsion force is generated between the first magnetic member and the second magnetic member, and the first magnetic member and the second magnetic member are separated from each other. After the current in the opposite direction disappears, the magnetic repulsion force between the first magnetic member and the second magnetic member remains unchanged.

[0006] Furthermore, the circuit breaker system further comprises: an elastic part, one end of which is connected to the first electromagnetic component, and the other end of which is connected to the second electromagnetic component, and the elastic part applies a force to the first electromagnetic component and the second electromagnetic component to move away from each other.

[0007] Further, one of the first electromagnetic component and the second electromagnetic component is fixedly arranged, and the other of the first electromagnetic component and the second electromagnetic component is movably arranged, and the movably arranged electromagnetic component is drivingly connected to the moving contact.

[0008] Furthermore, the first magnetic piece is a U-shaped structure, the first magnetic piece includes two first matching segments parallel to each other, and each first matching segment is made of magnetic memory material; the second magnetic piece is a U-shaped structure, the second magnetic piece includes two second matching segments parallel to each other, and each second matching segment is made of magnetic memory material; wherein the first opening of the first magnetic piece is arranged opposite to the second opening of the second magnetic piece.

[0009] Furthermore, the first magnetic part also includes a first connecting section, the two first mating sections are located on the same side of the first connecting section, and the two first mating sections are respectively connected to the two ends of the first connecting section, the second magnetic part also includes a second connecting section, the two second mating sections are located on the same side of the second connecting section, and the two second mating sections are respectively connected to the two ends of the second connecting section, one end of the elastic part is connected to the first connecting section, and the other end of the elastic part is connected to the second connecting section.

[0010] Furthermore, the first magnetic member is an integrally formed structure, and the first magnetic member is made of a magnetic memory material; the second magnetic member is an integrally formed structure, and the second magnetic member is made of a magnetic memory material.

[0011] Furthermore, the circuit breaker system also includes: a main circuit, having a first contact point and a second contact point isolated from each other, the moving contact is arranged on the first contact point, the static contact is arranged on the second contact point, the first contact point and the second contact point are connected to or isolated from each other through the moving contact and the static contact; a fault detection circuit, arranged on the main circuit and located at the end of the moving contact away from the static contact, the fault detection circuit is used to detect electrical parameters of the main circuit; an excitation control circuit, respectively connected to the fault detection circuit and the first coil and the second coil of the magnetic control mechanism, the excitation control circuit passes the same current for a first preset time or current in the opposite direction for a second preset time to the first coil and the second coil according to the electrical parameters of the main circuit detected by the fault detection circuit.

[0012] Furthermore, the excitation control circuit includes: an excitation current controller, which is electrically connected to the fault detection circuit to receive electrical parameters of the main circuit detected by the fault detection circuit; an energy storage device; an H-bridge circuit, which is electrically connected to the energy storage device and the excitation current controller, respectively, the energy storage device is used to provide direct current to the H-bridge circuit, and the excitation current controller applies instructions to the H-bridge circuit according to the received electrical parameters of the main circuit; the H-bridge circuit converts the direct current obtained from the energy storage device into a first preset time of unidirectional current or a second preset time of reverse current to the first coil and the second coil of the magnetic control mechanism according to the instructions of the excitation current controller.

[0013] Furthermore, the excitation control circuit also includes: a power supply circuit, which is electrically connected to the main circuit and the energy storage component respectively, and the power supply circuit has a working state cut-off state. When the main circuit is in a normal state, the power supply circuit is in a working state, and the main circuit stores electrical energy to the energy storage component through the power supply circuit to put the energy storage component in an energy storage state; when the main circuit is in an abnormal state, the power supply circuit cuts off the connection between the main circuit and the energy storage component, and the energy storage component releases electrical energy to the H-bridge circuit.

[0014] Furthermore, the circuit breaker system also includes an arc extinguishing mechanism, which includes: an arc extinguishing chamber, a avoidance opening is provided on one side of the arc extinguishing chamber, a static contact of the magnetic control mechanism is fixedly provided at the avoidance opening, and a moving contact of the magnetic control mechanism is movably provided at the avoidance opening; an arc extinguishing grid is located in the arc extinguishing chamber and on the same side as the static contact and the moving contact; an arc striking structure is provided at the avoidance opening, and when the moving contact is separated from the static contact, the arc striking structure is used to introduce the arc at the static contact and the moving contact into the arc extinguishing grid.

[0015] Furthermore, the arc extinguishing mechanism also includes an air inlet channel, one end of which is connected to the space inside the arc extinguishing chamber, and the other end is connected to the space outside the arc extinguishing chamber, and the air inlet channel is used to supply air outside the arc extinguishing chamber to enter the arc extinguishing chamber; and / or, the arc extinguishing mechanism also includes an exhaust channel, one end of the exhaust channel is connected to the space inside the arc extinguishing chamber, and the other end is connected to the space outside the arc extinguishing chamber, and the exhaust channel is used to exhaust the air in the arc extinguishing chamber.

[0016] By applying the technical solution of the present invention, the first magnetic member and the second magnetic member made of magnetic memory material can maintain the magnetic state after power is turned on. Even if the current disappears, the residual magnetic effect of the magnetic memory material enables the electromagnetic attraction or repulsion between the magnetic members to be maintained. This arrangement eliminates the continuous current demand of the circuit breaker system in a fault-free state, reduces energy consumption, and improves the energy efficiency and economy of the system.

[0017] Specifically, when the power system operates normally, the first magnetic member and the second magnetic member are attracted to each other, and the moving contact and the static contact are connected to each other; when a fault occurs in the power system, the first magnetic member and the second magnetic member are separated from each other, and the moving contact and the static contact are separated from each other.

[0018] When a fault in the power system is detected, a current in the opposite direction is passed through the first coil and the second coil for a second preset time. The introduction of the current in the opposite direction causes the original magnetic attraction between the first magnetic member and the second magnetic member to be transformed into a strong magnetic repulsion. Within the second preset time, the magnetic repulsion between the first magnetic member and the second magnetic member increases rapidly and overcomes the magnetic attraction in the original adsorption state. Moreover, the introduction of the current in the opposite direction causes the magnetic domains of the first magnetic member and the second magnetic member to be rearranged. Even after the current in the opposite direction disappears, the magnetic repulsion between the first magnetic member and the second magnetic member can still be maintained. The first preset time of the present application is in microseconds.

[0019] When the power system switches from a fault state to a normal state, a current in the same direction for a first preset time is passed through the first coil and the second coil. The introduction of the current in the same direction causes the original magnetic repulsion between the first magnetic member and the second magnetic member to be transformed into a strong magnetic attraction. Within the first preset time, the magnetic attraction between the first magnetic member and the second magnetic member increases rapidly and overcomes the magnetic repulsion in the original separation state. Moreover, the introduction of the current in the same direction causes the magnetic domains between the first magnetic member and the second magnetic member to be rearranged. Even after the current in the same direction disappears, the magnetic attraction between the first magnetic member and the second magnetic member can still be maintained. The second preset time of the present application is in microseconds.

[0020] The arrangement of this solution, due to the memory characteristics of the magnetic domains of the magnetic memory materials of the first magnetic member and the second magnetic member, does not require continuous power supply to the first coil and the second coil when the first magnetic member and the second magnetic member are switched between the separation state and the adsorption state, thus saving energy. In addition, the circuit breaker of the prior art solution needs to separate the moving iron core and the static iron core by the elastic force of the elastic member after the coil stops being energized, and its reliability is poor and the response speed is slow. The arrangement of the solution of this application, during the separation of the first magnetic member and the second magnetic member, its reliability is strong and the response speed is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 It shows a schematic structural diagram of the coordination of the arc extinguishing mechanism of the magnetron mechanism provided in an embodiment of the present invention;

[0023] Figure 2 A circuit schematic diagram of a circuit breaker system provided according to an embodiment of the present invention is shown;

[0024] Figure 3 A schematic diagram of an excitation control circuit provided according to an embodiment of the present invention is shown;

[0025] Figure 4 A schematic diagram of a fault detection circuit provided according to an embodiment of the present invention is shown.

[0026] The above drawings include the following reference numerals:

[0027] 10. Switch assembly; 11. Moving contact; 12. Static contact;

[0028] 20. Magnetic control mechanism;

[0029] 21. first electromagnetic assembly; 211. first magnetic member; 212. first coil;

[0030] 22. second electromagnetic assembly; 221. second magnetic member; 222. second coil;

[0031] 30. Elastic part;

[0032] 40, main circuit; 401, first contact point; 402, second contact point;

[0033] 50. Fault detection circuit; 51. Voltage and current sensing circuit; 52. Differential amplifier circuit; 53. Comparator; 54. Optocoupler isolation and signal conditioning circuit; 55. FPGA control circuit;

[0034] 60. Excitation control circuit;

[0035] 61. Excitation current controller; 62. Energy storage device; 63. H-bridge circuit; 64. Power supply circuit;

[0036] 70. Arc extinguishing mechanism;

[0037] 71. Arc extinguishing chamber; 72. Arc extinguishing grid. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0039] like Figure 1As shown, the present invention provides a circuit breaker system, including a switch assembly 10 and a magnetic control mechanism 20, the switch assembly 10 includes a moving contact 11 and a stationary contact 12, the moving contact 11 is connected to or separated from the stationary contact 12; the magnetic control mechanism 20 includes a first electromagnetic assembly 21 and a second electromagnetic assembly 22, the first electromagnetic assembly 21 includes a first magnetic member 211 and a first coil 212, at least part of the first magnetic member 211 is made of a magnetic memory material, and the first coil 212 is wound around a part of the magnetic memory material of the first magnetic member 211. The second electromagnetic component 22 is arranged opposite to the first electromagnetic component 21, and the second electromagnetic component 22 includes a second magnetic member 221 and a second coil 222. At least a portion of the second magnetic member 221 is made of a magnetic memory material, and the second coil 222 is wound around a portion of the magnetic memory material of the second magnetic member 221. The magnetomechanism 20 has a closed state and an open state that are relatively arranged. When the magnetomechanism 20 is in the closed state, the first magnetic member 211 and the second magnetic member 221 are attracted to each other; when the magnetomechanism 20 is in the open state, the first magnetic member 211 and the second magnetic member 221 are attracted to each other. In the open state, the first magnetic member 211 and the second magnetic member 221 are separated from each other, and one of the first electromagnetic assembly 21 and the second electromagnetic assembly 22 is connected to the moving contact 11 to connect or separate the moving contact 11 from the static contact 12; when the magnetic control mechanism 20 is in the open state, a current in the same direction for a first preset time is passed through the first coil 212 and the second coil 222, and a magnetic attraction force is generated between the first magnetic member 211 and the second magnetic member 221 until the first magnetic member 211 and the second magnetic member 221 are attracted to each other. Attached, after the current in the same direction disappears, the magnetic attraction between the first magnetic member 211 and the second magnetic member 221 remains unchanged; when the magnetron mechanism 20 is in the open state, a current in the opposite direction for a second preset time is passed through the first coil 212 and the second coil 222, and a magnetic repulsion is generated between the first magnetic member 211 and the second magnetic member 221, and the first magnetic member 211 and the second magnetic member 221 are separated from each other. After the current in the opposite direction disappears, the magnetic repulsion between the first magnetic member 211 and the second magnetic member 221 remains unchanged.

[0040] By applying the technical solution of the present invention, the first magnetic member 211 and the second magnetic member 221 made of magnetic memory material can maintain the magnetic state after power is turned on. Even if the current disappears, the residual magnetic effect of the magnetic memory material enables the electromagnetic attraction or repulsion between the magnetic members to be maintained. This arrangement eliminates the continuous current demand of the circuit breaker system in a fault-free state, reduces energy consumption, and improves the energy efficiency and economy of the system.

[0041] Specifically, when the power system operates normally, the first magnetic member 211 and the second magnetic member 221 are attracted to each other, and the moving contact 11 and the static contact 12 are connected to each other; when a fault occurs in the power system, the first magnetic member 211 and the second magnetic member 221 are separated from each other, and the moving contact 11 and the static contact 12 are separated from each other.

[0042] When a fault in the power system is detected, a current in the opposite direction for a second preset time is passed through the first coil 212 and the second coil 222. The introduction of the current in the opposite direction causes the original magnetic attraction between the first magnetic member 211 and the second magnetic member 221 to be transformed into a strong magnetic repulsion. Within the second preset time, the magnetic repulsion between the first magnetic member 211 and the second magnetic member 221 increases rapidly and overcomes the magnetic attraction in the original adsorption state. Moreover, the introduction of the current in the opposite direction causes the magnetic domains of the first magnetic member 211 and the second magnetic member 221 to be rearranged. Even after the current in the opposite direction disappears, the magnetic repulsion between the first magnetic member 211 and the second magnetic member 221 can still be maintained. The first preset time of the present application is in microseconds.

[0043] When the power system switches from a fault state to a normal state, a current in the same direction for a first preset time is passed through the first coil 212 and the second coil 222. The introduction of the current in the same direction causes the original magnetic repulsion between the first magnetic member 211 and the second magnetic member 221 to be transformed into a strong magnetic attraction. Within the first preset time, the magnetic attraction between the first magnetic member 211 and the second magnetic member 221 increases rapidly and overcomes the magnetic repulsion in the original separation state. Moreover, the introduction of the current in the same direction causes the magnetic domains between the first magnetic member 211 and the second magnetic member 221 to be rearranged. Even after the current in the same direction disappears, the magnetic attraction between the first magnetic member 211 and the second magnetic member 221 can still be maintained. The second preset time of the present application is in microseconds.

[0044] In the arrangement of this solution, due to the memory characteristics of the magnetic domains of the magnetic memory materials of the first magnetic member 211 and the second magnetic member 221, when the first magnetic member 211 and the second magnetic member 221 need to be switched between the separation state and the adsorption state, it is not necessary to continuously energize the first coil 212 and the second coil 222, thereby saving energy. In addition, in the circuit breaker of the prior art solution, after the coil stops being energized, the elastic force of the elastic member needs to drive the moving iron core and the static iron core to separate, which has poor reliability and slow response speed. In the arrangement of the solution of this application, during the separation of the first magnetic member 211 and the second magnetic member 221, it has strong reliability and fast response speed.

[0045] It can be understood that the magnetic domains of a magnetic piece with magnetic memory material can be locked under the action of a specific magnetic field. Even if the magnetic field dissipates, the magnetic domains of the magnetic piece can remain arranged, so that the magnetic piece remembers the magnetization state and the magnetic moment of the material still remains in the remembered magnetic field direction.

[0046] Furthermore, the circuit breaker system further comprises an elastic part 30 , one end of the elastic part 30 is connected to the first electromagnetic assembly 21 , and the other end is connected to the second electromagnetic assembly 22 , and the elastic part 30 applies a force to move the first electromagnetic assembly 21 and the second electromagnetic assembly 22 away from each other.

[0047] When a fault occurs in the power system, after currents in opposite directions are passed through the first coil 212 and the second coil 222, a magnetic repulsion force is generated between the first magnetic member 211 and the second magnetic member 221. At the same time, the elastic portion 30 applies forces in opposite directions to the first magnetic member 211 and the second magnetic member 221, thereby accelerating the separation of the first magnetic member 211 and the second magnetic member 221, and further improving the reliability and separation speed of the moving contact 11 and the static contact 12.

[0048] In this solution, one of the first electromagnetic component 21 and the second electromagnetic component 22 is fixedly arranged, and the other of the first electromagnetic component 21 and the second electromagnetic component 22 is movably arranged, and the movably arranged electromagnetic component is drivingly connected to the moving contact 11.

[0049] In the embodiment of the present solution, the first electromagnetic component 21 is fixedly arranged, and the second electromagnetic component 22 is movably arranged. The second electromagnetic component 22 is drivingly connected to the moving contact 11. Such an arrangement prevents the first electromagnetic component 21 from moving due to the existence of magnetic attraction and magnetic repulsion, simplifies the number of moving parts of the device, reduces the complexity of the device, reduces the manufacturing cost, and also reduces the failure rate caused by wear, jamming or misalignment of mechanical parts, thereby improving the overall reliability and service life of the device.

[0050] Further, the first magnetic member 211 is a U-shaped structure, the first magnetic member 211 includes two first matching sections parallel to each other, each of which is made of a magnetic memory material; the second magnetic member 221 is a U-shaped structure, the second magnetic member 221 includes two second matching sections parallel to each other, each of which is made of a magnetic memory material; wherein the first opening of the first magnetic member 211 is arranged opposite to the second opening of the second magnetic member 221. Such an arrangement can improve the compactness of the structure of the device, and improve the magnetic attraction and repulsion between the first magnetic member 211 and the second magnetic member 221.

[0051] In the embodiment of the present scheme, the first magnetic member 211 also includes a first connecting section, two first matching sections are located on the same side of the first connecting section, and the two first matching sections are respectively connected to the two ends of the first connecting section, the second magnetic member 221 also includes a second connecting section, two second matching sections are located on the same side of the second connecting section, and the two second matching sections are respectively connected to the two ends of the second connecting section, one end of the elastic part 30 is connected to the first connecting section, and the other end of the elastic part 30 is connected to the second connecting section. Further, one end of the elastic part 30 is located between the two first matching sections, and the other end of the elastic part 30 is located between the two second matching sections. Such a setting can further improve the compactness of the structure of the present device and improve the rationality of the layout of the present device.

[0052] Furthermore, the first magnetic member 211 is an integrally formed structure, and the first magnetic member 211 is made of magnetic memory material; the second magnetic member 221 is an integrally formed structure, and the second magnetic member 221 is made of magnetic memory material. The U-shaped structure of the magnetic member design helps to form a closed magnetic circuit with low magnetic resistance, and the magnetic flux is more likely to form a closed path in the magnetic material. In addition, the first opening of the first magnetic member 211 and the second opening of the second magnetic member 221 are arranged relative to each other, forming a closed magnetic circuit, so that the magnetic flux flows efficiently between the first magnetic member 211 and the second magnetic member 221, thereby forming an efficient flow between the first magnetic member 211 and the second magnetic member 221, further improving the adsorption and separation process between the second electromagnetic component 22 and the first electromagnetic component 21.

[0053] In the embodiment of this scheme, the moving contact 11 and the static contact 12 are made of contact materials that are resistant to arc ablation and have excellent conductivity, such as silver-tungsten alloy or copper-chromium alloy. The contact contact form is designed to be surface contact. By optimizing the surface roughness and contact pressure of the contact, the contact area is increased, the contact resistance is effectively reduced, and the current carrying capacity is improved. The contact opening distance is determined in the range of 8mm to 12mm according to the system voltage level and arc extinguishing requirements to ensure that sufficient insulation gap is quickly established when the switch is opened to prevent the arc from reigniting.

[0054] like Figures 2 to 4As shown, further, the circuit breaker system also includes a main circuit 40, a fault detection circuit 50 and an excitation control circuit 60. The main circuit 40 has a first contact point 401 and a second contact point 402 that are isolated from each other, the moving contact 11 is arranged on the first contact point 401, and the static contact 12 is arranged on the second contact point 402, and the first contact point 401 and the second contact point 402 are connected to or isolated from each other through the moving contact 11 and the static contact 12; the fault detection circuit 50 is arranged on the main circuit 40 and is located at the end of the moving contact 11 away from the static contact 12, and the fault detection circuit 50 is used to detect the electrical parameters of the main circuit 40; the excitation control circuit 60 is respectively connected to the fault detection circuit 50 and the first coil 212 and the second coil 222 of the magnetic control mechanism 20, and the excitation control circuit 60 passes the same current of the first preset time or the current of the opposite direction of the second preset time to the first coil 212 and the second coil 222 according to the electrical parameters of the main circuit 40 detected by the fault detection circuit 50. Through the coordinated work of the main circuit 40, the fault detection circuit 50 and the excitation control circuit 60, after a power failure occurs, the magnetic control mechanism 20 can give timely feedback to control the separation of the moving contact 11 and the static contact 12, thereby improving the safety and reliability of the power system.

[0055] Specifically, the circuit breaker system of the device is applied in the power system. When the power system operates normally, the first magnetic member 211 and the second magnetic member 221 are attracted to each other, the moving contact 11 and the static contact 12 are connected to each other, and the current passes through the main circuit 40.

[0056] The fault detection circuit 50 can monitor the electrical parameters of the main circuit 40 in real time. Once an abnormality is detected, the fault detection circuit 50 sends a signal to the excitation control circuit 60. After receiving the signal, the excitation control circuit 60 can immediately pass a reverse current of a second preset time to the first coil 212 and the second coil 222, and a magnetic repulsion force is quickly generated between the first magnetic member 211 and the second magnetic member 221. The second electromagnetic component 22 drives the moving contact 11 and the static contact 12 in the magnetic control mechanism 20 to separate, thereby realizing the rapid disconnection of the main circuit 40.

[0057] After the fault detection circuit 50 detects that the electrical parameters of the main circuit 40 have returned to normal, the fault detection circuit 50 sends a signal to the excitation control circuit 60. After receiving the signal, the excitation control circuit passes a unidirectional current for a first preset time through the first coil 212 and the second coil 222. A magnetic attraction force is quickly generated between the first magnetic member 211 and the second magnetic member 221. The second electromagnetic component 22 drives the moving contact 11 in the magnetic control mechanism 20 to connect with the static contact 12, thereby realizing rapid power-on of the main circuit 40.

[0058] In an embodiment of the present scheme, the excitation control circuit 60 includes an excitation current controller 61, an energy storage device 62 and an H-bridge circuit 63. The excitation current controller 61 is electrically connected to the fault detection circuit 50 to receive the electrical parameters of the main circuit 40 detected by the fault detection circuit 50; the H-bridge circuit 63 is electrically connected to the energy storage device 62 and the excitation current controller 61 respectively, the energy storage device 62 is used to provide direct current to the H-bridge circuit 63, and the excitation current controller 61 applies instructions to the H-bridge circuit 63 according to the received electrical parameters of the main circuit 40; the H-bridge circuit 63 converts the direct current obtained from the energy storage device 62 into a first preset time of unidirectional current or a second preset time of reverse current to the first coil 212 and the second coil 222 of the magnetic control mechanism 20 according to the instructions of the excitation current controller 61.

[0059] It is understandable that when the power system operates normally, the energy storage component 62 will not release its own energy and the H-bridge circuit is in a standby state; when the fault detection circuit 50 detects a short circuit or overload fault in the main circuit 40, the energy storage component 62 releases its own stored energy, and the operating state of the H-bridge circuit 63 quickly changes from the standby mode to the activation mode, and according to the instructions of the excitation current controller 61, the direct current obtained from the energy storage component 62 is converted into a reverse current provided to the first coil 212 and the second coil 222 of the magnetron mechanism 20 respectively.

[0060] Specifically, after receiving the fault signal from the fault detection circuit 50, the excitation current controller 61 will quickly analyze the type and intensity of the fault and calculate the required excitation current magnitude and direction. Subsequently, the excitation current controller 61 sends an accurate control signal to the H-bridge circuit 63, including the magnitude, direction and duration of the excitation current.

[0061] The power switch tube in the H-bridge circuit 63 responds immediately after receiving the control signal from the excitation current controller 61 and is turned on or off according to the instruction.

[0062] When rapid opening of the circuit breaker is required, the H-bridge circuit 63 converts the direct current in the energy storage element 62 into a reverse current. By controlling the opening and closing sequence of the power switch tube, a reverse current of a second preset time is passed through the first coil 212 and the second coil 222. A magnetic repulsive force is generated between the first magnetic element 211 and the second magnetic element 221, and the second electromagnetic component 22 quickly drives the moving contact 11 to separate from the static contact 12.

[0063] In the closing operation after the fault is eliminated, the H-bridge circuit 63 outputs a first preset time of unidirectional current to the first coil 212 and the second coil 222, and a magnetic attraction is generated between the first magnetic member 211 and the second magnetic member 221, and the second electromagnetic assembly 22 quickly drives the moving contact 11 to connect with the static contact 12. In addition, when the power system is operating normally, the energy storage member 62 is in an energy storage state. When the opening action is required, that is, the moving contact 11 is separated from the static contact 12, the excitation current controller 61 controls the H-bridge circuit 63 to quickly release the stored energy and convert it into the required excitation current.

[0064] In an embodiment of the present scheme, when a short circuit fault occurs in the power system, a larger excitation current is output, the current range is 15A to 25A, and the duration is shorter, the duration is 5ms to 10ms; when an overload fault occurs in the power system, the excitation current is relatively small, the current range is 5A to 10A, and the duration is 15ms to 30ms.

[0065] Furthermore, the excitation control circuit 60 also includes a power supply circuit 64, which is electrically connected to the main circuit 40 and the energy storage component 62, respectively. The power supply circuit 64 has a working state cut-off state. When the main circuit 40 is in a normal state, the power supply circuit 64 is in a working state, and the main circuit 40 stores electric energy to the energy storage component 62 through the power supply circuit 64 so that the energy storage component 62 is in an energy storage state; when the main circuit 40 is in an abnormal state, the power supply circuit 64 cuts off the connection between the main circuit 40 and the energy storage component 62, and the energy storage component 62 releases electric energy to the H-bridge circuit 63. Such a configuration can further improve the stability and reliability of the energy storage or energy release process of the energy storage component 62.

[0066] Specifically, when the main circuit 40 is in a normal operating state, the power supply circuit 64 is in a working state, which draws energy from the main circuit 40 and converts it into an electrical energy form suitable for the energy storage component 62. When the fault detection circuit 50 detects an abnormal state of the main circuit 40, such as a short circuit or overload, and sends a signal to the excitation current controller 61, the response mechanism of the power supply circuit 64 is immediately activated. The power supply circuit 64 will automatically cut off the electrical connection between the main circuit 40 and the energy storage component 62 to prevent the abnormal current from passing through the power supply circuit 64 to damage the energy storage component 62, while protecting the H-bridge circuit 63 from the influence of the fault current; at this time, the energy storage component 62 is in an energy isolation state, but the stored energy is sufficient to be quickly released under the instruction of the excitation current controller 61, providing the H-bridge circuit 63 with the energy for the excitation current required to drive the magnetic control mechanism 20.

[0067] In the embodiment of the present solution, the fault detection circuit 50 includes a voltage and current sensing circuit 51 , a differential amplifier circuit 52 , a comparator 53 , an optocoupler isolation and signal conditioning circuit 54 , and an FPGA control circuit 55 .

[0068] The voltage and current sensing circuit 51 uses a high-precision sensor to sample the voltage and current in the DC line in real time. The sampled weak voltage and current signals first enter the differential amplifier circuit 52, which can effectively suppress common-mode interference, amplify useful signals, and improve the signal-to-noise ratio of the signal.

[0069] The amplified signal is sent to the comparator 53, in which fault thresholds are preset. These thresholds are determined based on the normal operating parameter range of the DC system and the analysis of the fault situation.

[0070] When the input signal exceeds the corresponding threshold, the comparator 53 outputs a jump signal.

[0071] The optocoupler isolation and signal conditioning circuit 54 performs electrical isolation and signal shaping, isolates the signal output by the comparator 53 to prevent interference signals from being transmitted to subsequent circuits, and further conditions the signal to meet the input requirements of the FPGA control circuit 55.

[0072] As the core control unit of the fault detection circuit, the FPGA control circuit 55 has powerful logic processing capabilities and high-speed computing capabilities. It receives the conditioned signal and performs algorithmic logic judgment to confirm whether a fault occurs. Once a fault is determined to have occurred, the FPGA control circuit 55 immediately sends a fault signal to the excitation control circuit 60, and can also record and store information such as the fault type and fault occurrence time for subsequent fault analysis and system maintenance.

[0073] like Figure 1 As shown, further, the circuit breaker system also includes an arc extinguishing mechanism 70, and the arc extinguishing mechanism 70 includes an arc extinguishing chamber 71, an arc extinguishing grid 72 and an arc striking structure. Among them, a avoidance port is provided on one side of the arc extinguishing chamber 71, the static contact 12 of the magnetic control mechanism 20 is fixedly arranged at the avoidance port, and the moving contact 11 of the magnetic control mechanism 20 is movably arranged at the avoidance port; the arc extinguishing grid 72 is located in the arc extinguishing chamber 71, and is located on the same side where the static contact 12 and the moving contact 11 are located; the arc striking structure is arranged at the avoidance port, and when the moving contact 11 is separated from the static contact 12, the arc striking structure is used to introduce the arc at the static contact 12 and the moving contact 11 into the arc extinguishing grid 72. When the magnetic control mechanism 20 drives the moving contact 11 to separate from the static contact 12, the arc is ignited. At this time, the arc striking structure responds quickly, and the arc striking structure guides the arc into the arc extinguishing chamber 71. After the arc enters the arc extinguishing chamber 71, it will be divided into multiple short arcs by the arc extinguishing grid 72. Each short arc is rapidly cooled by the heat conduction and heat dissipation of the arc extinguishing grid. This series of operations is completed in a very short time, thereby achieving rapid extinguishing of the arc, avoiding the possibility of the arc reigniting, and protecting the power system from damage caused by the continuous burning of the arc.

[0074] In the embodiment of the present scheme, the arc extinguishing mechanism 70 further includes an air inlet channel and an exhaust channel, one end of the air inlet channel is in communication with the space inside the arc extinguishing chamber 71, and the other end is in communication with the space outside the arc extinguishing chamber 71, and the air inlet channel is used to supply air outside the arc extinguishing chamber 71 to the arc extinguishing chamber 71; one end of the exhaust channel is in communication with the space inside the arc extinguishing chamber 71, and the other end is in communication with the space outside the arc extinguishing chamber 71, and the exhaust channel is used to exhaust the air inside the arc extinguishing chamber 71. The air inlet channel and the exhaust channel cooperate with each other, and can introduce external cold air into the arc extinguishing chamber 71 during the arc extinguishing process to accelerate the cooling of the arc, and the cold air also helps the metal grid to dissipate heat more quickly, while reducing the arc temperature and accelerating the deionization process; at the same time, the hot air in the arc extinguishing chamber 71 and the harmful gases generated during the arc extinguishing process are discharged in time, avoiding the risk of arc reignition, and also reducing the damage of the arc to the circuit breaker components, thereby extending the service life of the circuit breaker.

[0075] Specifically, the arc extinguishing chamber 71 is made of ceramic or glass fiber reinforced plastic that is resistant to high temperatures and has excellent insulation properties. Its structural design fully considers the arc movement characteristics and gas flow laws, and adopts a streamlined design to facilitate smooth entry of the arc.

[0076] Furthermore, the arc extinguishing grid 72 is composed of a plurality of mutually insulated and spaced metal grids, which are usually made of materials with high temperature resistance and good electrical conductivity, such as copper alloy or stainless steel, with a thickness of 1 mm to 3 mm, and a spacing of 3 mm to 8 mm designed and arranged according to arc voltage and arc extinguishing requirements. The surface of the grid is specially treated, such as nickel plating or passivation treatment, to enhance the anti-oxidation and anti-corrosion capabilities and improve the service life.

[0077] It can be understood that the circuit breaker system of this solution can be applied to both DC power systems and AC power systems.

[0078] When applied in a DC power system, when a short circuit occurs in the DC power system, since there is no natural zero crossing point, the short-circuit current will rise rapidly and the amplitude will be extremely large, and its rising rate will far exceed the short-circuit situation of the AC system. This characteristic makes it difficult to extinguish the fault current by means of natural zero crossing, thus placing strict requirements on the breaking capacity of the circuit breaker system. A DC short-circuit fault will also cause a sharp drop in the system voltage, affecting the stability of the entire DC power grid, and may cause a chain failure, affecting a large number of power equipment and user ends. The setting of this solution has an extremely high response speed. When a fault occurs in the power system, the magnetic control mechanism 20 can quickly drive the moving contact 11 and the static contact 12 to separate, ensuring that the circuit is reliably disconnected in a very short time to limit the scope of harm of the fault current.

[0079] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0080] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0081] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0082] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0083] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A circuit breaker system, characterized in that: include: A switch assembly (10) comprises a moving contact (11) and a stationary contact (12), wherein the moving contact (11) is connected to or separated from the stationary contact (12); A magnetomechanism (20) comprises a first electromagnetic assembly (21) and a second electromagnetic assembly (22), wherein the first electromagnetic assembly (21) comprises a first magnetic member (211) and a first coil (212), wherein at least a portion of the first magnetic member (211) is made of a magnetic memory material, and the first coil (212) is wound around a portion of the magnetic memory material of the first magnetic member (211); and the second electromagnetic assembly (22) is arranged opposite to the first electromagnetic assembly (21), wherein the second electromagnetic assembly (22) comprises a second magnetic member (221) and a second coil (222), wherein at least a portion of the second magnetic member (221) is made of a magnetic memory material, and the second coil (222) is wound around a portion of the magnetic memory material of the first magnetic member (211). 222) is wound around the portion of the magnetic memory material of the second magnetic member (221), the magnetic control mechanism (20) has a closed state and an open state that are relatively arranged, when the magnetic control mechanism (20) is in the closed state, the first magnetic member (211) and the second magnetic member (221) are attracted to each other; when the magnetic control mechanism (20) is in the open state, the first magnetic member (211) and the second magnetic member (221) are separated from each other, and one of the first electromagnetic component (21) and the second electromagnetic component (22) is driven and connected to the moving contact (11) so that the moving contact (11) is connected to or separated from the static contact (12); When the magnetic control mechanism (20) is in the open state, a current in the same direction for a first preset time is passed through the first coil (212) and the second coil (222), and a magnetic attraction force is generated between the first magnetic member (211) and the second magnetic member (221) until the first magnetic member (211) and the second magnetic member (221) are attracted to each other, and after the current in the same direction disappears, the magnetic attraction force between the first magnetic member (211) and the second magnetic member (221) remains unchanged; When the magnetomechanism (20) is in the closed state, a current in opposite directions for a second preset time is passed through the first coil (212) and the second coil (222), a magnetic repulsion force is generated between the first magnetic member (211) and the second magnetic member (221), and the first magnetic member (211) and the second magnetic member (221) are separated from each other; after the current in opposite directions disappears, the magnetic repulsion force between the first magnetic member (211) and the second magnetic member (221) remains unchanged.

2. The circuit breaker system according to claim 1, characterized in that: The circuit breaker system further comprises: An elastic part (30), one end of the elastic part (30) is connected to the first electromagnetic component (21), and the other end is connected to the second electromagnetic component (22), and the elastic part (30) applies a force to the first electromagnetic component (21) and the second electromagnetic component (22) to move them away from each other.

3. The circuit breaker system according to claim 1, characterized in that: One of the first electromagnetic component (21) and the second electromagnetic component (22) is fixedly arranged, and the other of the first electromagnetic component (21) and the second electromagnetic component (22) is movably arranged, and the movably arranged electromagnetic component is drivingly connected to the moving contact (11).

4. The circuit breaker system according to claim 2, characterized in that: The first magnetic member (211) is a U-shaped structure, and comprises two first matching sections parallel to each other, and each of the first matching sections is made of a magnetic memory material; The second magnetic member (221) is a U-shaped structure, and comprises two second matching sections parallel to each other, and each of the second matching sections is made of a magnetic memory material; Wherein, the first opening of the first magnetic member (211) and the second opening of the second magnetic member (221) are arranged opposite to each other.

5. The circuit breaker system according to claim 4, characterized in that: The first magnetic member (211) further comprises a first connecting section, wherein the two first matching sections are located on the same side of the first connecting section, and the two first matching sections are respectively connected to the two ends of the first connecting section; the second magnetic member (221) further comprises a second connecting section, wherein the two second matching sections are located on the same side of the second connecting section, and the two second matching sections are respectively connected to the two ends of the second connecting section; one end of the elastic portion (30) is connected to the first connecting section, and the other end of the elastic portion (30) is connected to the second connecting section.

6. The circuit breaker system according to claim 1, characterized in that: The first magnetic member (211) is an integrally formed structure, and the first magnetic member (211) is made of a magnetic memory material; The second magnetic member (221) is an integrally formed structure, and the second magnetic member (221) is made of a magnetic memory material.

7. The circuit breaker system according to claim 1, characterized in that: The circuit breaker system further comprises: A main circuit (40) having a first contact point (401) and a second contact point (402) which are isolated from each other, the movable contact (11) being arranged on the first contact point (401), the stationary contact (12) being arranged on the second contact point (402), the first contact point (401) and the second contact point (402) being connected to or isolated from each other via the movable contact (11) and the stationary contact (12); A fault detection circuit (50) is arranged on the main circuit (40) and is located at an end of the moving contact (11) away from the static contact (12), and the fault detection circuit (50) is used to detect electrical parameters of the main circuit (40); An excitation control circuit (60) is connected to the fault detection circuit (50) and the first coil (212) and the second coil (222) of the magnetic control mechanism (20), respectively. The excitation control circuit (60) supplies the same current for a first preset time or currents in opposite directions for a second preset time to the first coil (212) and the second coil (222) according to electrical parameters of the main circuit (40) detected by the fault detection circuit (50).

8. The circuit breaker system according to claim 7, characterized in that: The excitation control circuit (60) comprises: an excitation current controller (61), electrically connected to the fault detection circuit (50) to receive electrical parameters of the main circuit (40) detected by the fault detection circuit (50); Energy storage device (62); The H-bridge circuit (63) is electrically connected to the energy storage component (62) and the excitation current controller (61), respectively; the energy storage component (62) is used to provide direct current to the H-bridge circuit (63); the excitation current controller (61) applies instructions to the H-bridge circuit (63) according to the received electrical parameters of the main circuit (40); the H-bridge circuit (63) converts the direct current obtained from the energy storage component (62) into a first preset time unidirectional current or a second preset time reverse current to the first coil (212) and the second coil (222) of the magnetron mechanism (20) according to the instructions of the excitation current controller (61).

9. The circuit breaker system according to claim 8, characterized in that: The excitation control circuit (60) further includes: A power circuit (64) is electrically connected to the main circuit (40) and the energy storage component (62) respectively. The power circuit (64) has a working state cut-off state. When the main circuit (40) is in a normal state, the power circuit (64) is in the working state. The main circuit (40) stores electric energy in the energy storage component (62) through the power circuit (64) so ​​that the energy storage component (62) is in an energy storage state. When the main circuit (40) is in an abnormal state, the power circuit (64) cuts off the connection between the main circuit (40) and the energy storage component (62), and the energy storage component (62) releases electric energy to the H-bridge circuit (63).

10. The circuit breaker system according to claim 6, characterized in that The circuit breaker system further comprises an arc extinguishing mechanism (70), wherein the arc extinguishing mechanism (70) comprises: An arc extinguishing chamber (71), wherein a relief opening is arranged on one side of the arc extinguishing chamber (71), a stationary contact (12) of the magnetic control mechanism (20) is fixedly arranged at the relief opening, and a moving contact (11) of the magnetic control mechanism (20) is movably arranged at the relief opening; An arc extinguishing grid (72) is located in the arc extinguishing chamber (71) and is located on the same side as the stationary contact (12) and the moving contact (11); An arc striking structure is arranged at the avoidance opening, and when the moving contact (11) is separated from the stationary contact (12), the arc striking structure is used to guide the arc at the stationary contact (12) and the moving contact (11) into the arc extinguishing grid (72).

11. The circuit breaker system according to claim 10, characterized in that: The arc extinguishing mechanism (70) further comprises an air inlet passage, one end of the air inlet passage being in communication with the space inside the arc extinguishing chamber (71), and the other end of the air inlet passage being in communication with the space outside the arc extinguishing chamber (71), the air inlet passage being used for allowing air outside the arc extinguishing chamber (71) to enter the arc extinguishing chamber (71); and / or, The arc extinguishing mechanism (70) further comprises an exhaust channel, one end of which is in communication with the space inside the arc extinguishing chamber (71), and the other end of which is in communication with the space outside the arc extinguishing chamber (71), and the exhaust channel is used to exhaust the air in the arc extinguishing chamber (71).

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