Double-moving-contact circuit breaker and control method thereof

Abstract

The invention discloses a double-moving-contact circuit breaker jointly driven by a permanent magnet mechanism and a repulsive force mechanism and a control method thereof.The double-moving-contact circuit breaker comprises the permanent magnet mechanism, the repulsive force mechanism and a double-moving-contact arc extinguish chamber, a main moving contact is arranged in a ceramic shell, the main moving contact is connected with the permanent magnet mechanism and driven by the permanent magnet mechanism to move, and a secondary moving contact is arranged in the ceramic shell and driven by the repulsive force mechanism to move. The secondary moving contact is connected with the repulsive force mechanism and is driven by the repulsive force mechanism to move; when the double-moving-contact circuit breaker cuts off normal current, the permanent magnet mechanism drives the main moving contact to move, and when the double-moving-contact circuit breaker cuts off short-circuit current, the permanent magnet mechanism drives the main moving contact to move, and the repulsive force mechanism drives the secondary moving contact to move at the same time. When the double-moving-contact circuit breaker is switched on after being switched off, the permanent magnet mechanism drives the main moving contact to be switched on, and when the double-moving-contact circuit breaker is switched on after being switched off after being short-circuited, the repulsive force mechanism drives the secondary moving contact to be switched on so as to return to the state to be switched on after being normally switched off, and then the permanent magnet mechanism drives the main moving contact to be switched on.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum circuit breakers, in particular to a double-moving contact circuit breaker and its control method, and more particularly to a double-moving contact circuit breaker driven by a common permanent magnet and repulsion mechanism and its control method. Background Art

[0002] A circuit breaker is one of the very important devices in the power system. It is responsible for protecting the safety and reliable operation of the power system by opening the faulty circuit when a fault occurs in the circuit. In recent years, as the scale of the power system has been continuously expanding, the challenges faced by circuit breakers have been increasing day by day. Traditional hydraulic and spring operating mechanisms can no longer meet the requirements of the power system for switching speed due to their long actuation time.

[0003] Vacuum circuit breakers with permanent magnet mechanisms have been widely used in medium and high voltage distribution fields due to their advantages such as simple structure, high reliability, long opening distance, high voltage level, and extremely long mechanical life (up to more than 100,000 times). However, their movement speed is relatively slow, and the opening start time is relatively long (usually ≥30 ms), which limits their application in occasions requiring extremely fast protection. On the other hand, the repulsion mechanism uses the eddy current repulsion force generated by the short-circuit current itself to drive the contact, with an extremely fast opening response speed (≤1 ms), high movement acceleration, and can effectively handle short-circuit faults. However, due to its structural characteristics, its opening distance is small, the contact life is short (usually only 10,000 - 20,000 times), and it is difficult to meet the insulation requirements of high voltage levels (such as above 72.5 kV), so it is mostly used for fast protection in low voltage or special occasions.

[0004] The information disclosed in the background art section is only used to enhance the understanding of the background of the present invention, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] Aiming at the deficiencies or defects existing in the above-mentioned prior art, a double-moving contact circuit breaker and its control method are provided, which can achieve the rapid opening of short-circuit current in the high-voltage field such as 126 kV, achieve rapid opening under high voltage and large opening distance, and significantly shorten the relatively long opening start time and extremely fast opening response speed.

[0006] The object of the present invention is achieved through the following technical solutions.

[0007] A double-moving contact circuit breaker driven by a common permanent magnet and repulsion mechanism includes

[0008] The double-moving contact arc extinguishing chamber includes

[0009] A porcelain shell

[0010] A main moving contact, which is arranged inside the porcelain shell, and the main moving contact is connected and driven to move by a permanent magnet mechanism.

[0011] The secondary moving contact is arranged inside the porcelain shell, and the secondary moving contact is connected and driven to move via a repulsive force mechanism;

[0012] When the double-moving-contact circuit breaker interrupts normal current, the permanent magnet mechanism drives the main moving contact to move. When the double-moving-contact circuit breaker interrupts short-circuit current, the permanent magnet mechanism drives the main moving contact to move and the repulsive force mechanism simultaneously drives the secondary moving contact to move;

[0013] When the double-moving-contact circuit breaker closes after interruption, the permanent magnet mechanism drives the main moving contact to close. When the double-moving-contact circuit breaker closes after short-circuit interruption, the repulsive force mechanism drives the secondary moving contact to close to return to the state where it is about to close after normal interruption, and then the permanent magnet mechanism drives the main moving contact to close.

[0014] In the double-moving-contact circuit breaker described above, the permanent magnet mechanism includes,

[0015] A yoke,

[0016] A tripping coil, which is arranged inside the yoke and provides a driving force for the moving iron core during tripping,

[0017] A closing coil, which is arranged inside the yoke and at the other end of the tripping coil, and provides a driving force for the moving iron core during closing,

[0018] A moving iron core, which is arranged inside the tripping coil and the closing coil and shuttles between the tripping coil and the closing coil to achieve tripping and closing operations. In the closed state, it is adsorbed on the yoke,

[0019] A permanent magnet mechanism insulating pull rod, one end of which is connected to the moving iron core and the other end is connected to the main moving contact.

[0020] In the double-moving-contact circuit breaker described above, the repulsive force mechanism includes,

[0021] A cross bracket,

[0022] A bistable spring, which is arranged at both ends of the cross bracket and provides a tripping and closing holding force for the repulsive force mechanism,

[0023] A repulsive force mechanism main shaft, which is arranged on the cross bracket and perpendicular to the cross bracket to transmit kinetic energy,

[0024] A closing stop, which is arranged on the outer circle of the repulsive force mechanism main shaft and above the cross bracket. The closing stop is used for stopping during the closing process of the repulsive force mechanism to control the distance that the bistable spring pushes the cross bracket upward,

[0025] A repulsive force disc, which is arranged on the repulsive force mechanism main shaft and provides the tripping and closing power for the repulsive force mechanism,

[0026] The insulating pull rod of the repulsive force mechanism is arranged on the main shaft of the repulsive force mechanism and connects the secondary moving contact.

[0027] In the double moving contact circuit breaker, the insulation voltage levels of the insulating pull rods of the permanent magnet mechanism and the repulsive force mechanism are not lower than the insulation voltage level of the double moving contact arc extinguishing chamber.

[0028] In the double moving contact circuit breaker, when in the closed state, the moving iron core is adsorbed on the magnetic yoke, the holding force of the bistable spring is less than the suction force provided by the magnetic yoke, the main moving contact and the secondary moving contact are pressed against each other, and the distance between the cross bracket and the closing stop below is the mechanism overtravel.

[0029] In the double moving contact circuit breaker, the mechanism overtravel is 5 mm.

[0030] In the double moving contact circuit breaker, the stroke of the permanent magnet mechanism is 60 mm, and the opening distance between the main moving contact and the secondary moving contact in the normal opening state is 55 mm.

[0031] In the double moving contact circuit breaker, the stroke of the repulsive force mechanism is 30 mm, and the opening distance between the main moving contact and the secondary moving contact is 85 mm.

[0032] In the double moving contact circuit breaker, the central axes of the main moving contact and the secondary moving contact are collinear.

[0033] The control method of the double moving contact circuit breaker commonly driven by the permanent magnet and the repulsive force mechanism includes,

[0034] When the double moving contact circuit breaker breaks normal current, the opening coil of the permanent magnet mechanism is energized, an upward pulling force is generated in the moving iron core to pull the main moving contact upward. At this time, the secondary moving contact moves upward together with the main moving contact under the push of the repulsive force mechanism. When the cross bracket touches the closing stop, the secondary moving contact stops moving, the main moving contact separates from the secondary moving contact and continues to move upward under the pulling of the moving iron core to achieve the opening function;

[0035] When the double moving contact circuit breaker breaks short-circuit current, the repulsive force disc generates a downward acting force to drive the secondary moving contact downward. After the secondary moving contact operates for a certain time, the moving iron core drives the main moving contact upward to complete the short-circuit opening;

[0036] When the double moving contact circuit breaker needs to be closed after normal opening, the closing coil of the permanent magnet mechanism is energized, the moving iron core generates a downward acting force to push the main moving contact downward. When the main moving contact collides with the driven contact, the cross bracket separates from the closing stopper, and the two contacts move downward together with the mechanism overtravel until the moving iron core is adsorbed on the magnetic yoke to complete the closing operation;

[0037] When the double-moving-contact circuit breaker needs to be closed after short-circuit interruption, a repulsive force upward is first generated in the repulsive force disc, driving the cross bracket and the secondary moving contact upward. When the cross bracket contacts the closing stop, the closing operation after normal interruption is then carried out.

[0038] Compared with the prior art, the beneficial effects brought by the present invention are as follows:

[0039] The present invention combines the advantages of the permanent magnet mechanism and the repulsive force mechanism by using a double-moving-contact vacuum interrupter. During normal interruption, the permanent magnet mechanism is used for interruption, which has the advantages of high reliability, long opening distance, high voltage level, long mechanical life, etc., and reduces the loss of the circuit breaker itself as much as possible while ensuring normal interruption. During the interruption of short-circuit current, the electromagnetic repulsive force mechanism and the permanent magnet mechanism are used for interruption simultaneously, which has the advantages of fast opening response speed and high movement acceleration, and can achieve the removal of short-circuit faults in an extremely short time. The requirement of fast opening at 126 kV is realized through the cooperation of the sum of the closing holding forces and the driving strategy between the two mechanisms.

[0040] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to the extent that those skilled in the art can implement it according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following takes the specific embodiments of the present invention as examples for illustration. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The accompanying drawings in the specification are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0042] In the drawings:

[0043] Figure 1 is the schematic diagram of the closing position of the double-moving-contact circuit breaker of the present invention;

[0044] Figure 2 is the schematic diagram of the normal opening state of the double-moving-contact circuit breaker of the present invention;

[0045] Figure 3 is the schematic diagram of the fault opening state of the double-moving-contact circuit breaker of the present invention;

[0046] Figure 4It is the schematic diagram of the present invention when the main moving contact and the secondary moving contact of the double - acting contact circuit breaker are in contact and the cross bracket and the closing support member are in contact;

[0047] In the figure: 1 is the opening coil, 2 is the permanent magnet mechanism, 3 is the closing coil, 4 is the moving iron core, 5 is the yoke, 6 is the insulating pull rod of the permanent magnet mechanism, 7 is the double - acting contact arc - extinguishing chamber, 8 is the main moving contact, 9 is the secondary moving contact, 10 is the insulating pull rod of the repulsive force mechanism, 11 is the repulsive force disk, 12 is the main shaft of the repulsive force mechanism, 13 is the closing stop member, 14 is the cross bracket, 15 is the bistable spring, 16 is the repulsive force mechanism.

[0048] The following further explains the present invention in conjunction with the drawings and embodiments. Specific Embodiments

[0049] The specific embodiments of the present invention will be described in more detail below with reference to the drawings. Although the specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0050] It should be noted that in the description of the specification and the claims, certain terms are used to refer to specific components. Those skilled in the art should understand that technicians may use different terms to refer to the same component. The description of the specification and the claims does not use the difference in terms as a way to distinguish components, but uses the difference in functions of components as the criterion for distinction. For example, the terms "comprising" or "including" mentioned throughout the specification and the claims are open - ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is for the purpose of implementing the preferred embodiments of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the scope defined by the appended claims.

[0051] For the convenience of understanding the embodiments of the present invention, the following will further explain with several specific embodiments as examples in conjunction with the drawings, and each drawing does not constitute a limitation on the embodiments of the present invention.

[0052] For better understanding, as Figures 1 to 4 shown, a double - acting contact circuit breaker includes,

[0053] The double - acting contact arc - extinguishing chamber 7 includes,

[0054] A porcelain shell,

[0055] The main moving contact 8, which is arranged inside the porcelain shell, and the main moving contact 8 is connected and driven to move by the permanent magnet mechanism 2.

[0056] The secondary moving contact 9 is disposed within the porcelain housing, and the secondary moving contact 9 is connected and driven to move via the repulsive force mechanism 16;

[0057] When the double moving contact circuit breaker interrupts normal current, the permanent magnet mechanism 2 drives the main moving contact 8 to move. When the double moving contact circuit breaker interrupts short - circuit current, the permanent magnet mechanism 2 drives the main moving contact 8 to move and the repulsive force mechanism 16 simultaneously drives the secondary moving contact 9 to move;

[0058] When the double moving contact circuit breaker closes after interruption, the permanent magnet mechanism 2 drives the main moving contact 8 to close. When the double moving contact circuit breaker closes after short - circuit interruption, the repulsive force mechanism 16 drives the secondary moving contact 9 to close to return to the state where it is about to close after normal interruption, and then the permanent magnet mechanism 2 drives the main moving contact 8 to close.

[0059] In a preferred embodiment of the double moving contact circuit breaker, the permanent magnet mechanism 2 includes,

[0060] The yoke 5,

[0061] The opening coil 1 is disposed within the yoke 5 and provides a driving force for the moving iron core 4 during opening,

[0062] The closing coil 3 is disposed within the yoke 5 and at the other end of the opening coil 1, and provides a driving force for the moving iron core 4 during closing,

[0063] The moving iron core 4 is disposed within the opening coil 1 and the closing coil 3 and shuttles between the opening coil 1 and the closing coil 3 to achieve opening and closing operations. In the closed state, it is adsorbed on the yoke 5,

[0064] The permanent magnet mechanism insulating pull rod 6 has one end connected to the moving iron core 4 and the other end connected to the main moving contact 8.

[0065] In a preferred embodiment of the double moving contact circuit breaker, the repulsive force mechanism 16 includes,

[0066] The cross bracket 14,

[0067] The bistable spring 15 is disposed at both ends of the cross bracket 14 and provides the opening and closing holding force for the repulsive force mechanism 16,

[0068] The repulsive force mechanism main shaft 12 is disposed on the cross bracket 14 and perpendicular to the cross bracket 14 to transmit kinetic energy,

[0069] The closing stop member 13 is disposed on the outer ring of the repulsive force mechanism main shaft 12 and above the cross bracket 14. The closing stop member 13 is used for stopping during the closing process of the repulsive force mechanism 16 to control the distance that the bistable spring 15 pushes the cross bracket 14 upward,

[0070] A repulsive force disc 11, which is arranged on the main shaft 12 of the repulsive force mechanism, provides the power for closing and opening for the repulsive force mechanism 16.

[0071] An insulating pull rod 10 of the repulsive force mechanism, which is arranged on the main shaft 12 of the repulsive force mechanism and connects the secondary moving contact 9.

[0072] In a preferred embodiment of the double-moving-contact circuit breaker, the insulation voltage levels of the permanent magnet mechanism insulating pull rod 6 and the repulsive force mechanism insulating pull rod 10 are not lower than the insulation voltage level of the double-moving-contact arc extinguishing chamber 7.

[0073] In a preferred embodiment of the double-moving-contact circuit breaker, when in the closed state, the moving iron core 4 is adsorbed on the magnetic yoke 5, the holding force of the bistable spring 15 is less than the suction force provided by the magnetic yoke 5, the main moving contact 8 and the secondary moving contact 9 are pressed against each other, and the distance between the cross bracket 14 and the closing stop 13 below is the mechanism overtravel.

[0074] In a preferred embodiment of the double-moving-contact circuit breaker, the mechanism overtravel is 5 mm.

[0075] In a preferred embodiment of the double-moving-contact circuit breaker, the stroke of the permanent magnet mechanism 2 is 60 mm, and the opening distance between the main moving contact 8 and the secondary moving contact 9 in the normal opening state is 55 mm.

[0076] In a preferred embodiment of the double-moving-contact circuit breaker, the stroke of the repulsive force mechanism 16 is 30 mm, and the opening distance between the main moving contact 8 and the secondary moving contact 9 is 85 mm.

[0077] In a preferred embodiment of the double-moving-contact circuit breaker, the central axes of the main moving contact 8 and the secondary moving contact 9 are collinear.

[0078] The control method of the double-moving-contact circuit breaker includes

[0079] When the double-moving-contact circuit breaker interrupts a normal current, the opening coil 1 of the permanent magnet mechanism 2 is energized, an upward pulling force is generated in the moving iron core 4 to pull the main moving contact 8 upward. At this time, the secondary moving contact 9 moves upward together with the main moving contact 8 under the push of the repulsive force mechanism 16. When the cross bracket 14 contacts the closing stop 13, the secondary moving contact 9 stops moving, the main moving contact 8 is separated from the secondary moving contact 9 and continues to move upward under the pull of the moving iron core 4 to achieve the opening function.

[0080] When the double-moving-contact circuit breaker interrupts a short-circuit current, the repulsive force disc 11 generates a downward acting force to drive the secondary moving contact 9 to move downward. After the secondary moving contact 9 operates for a certain time, the moving iron core 4 drives the main moving contact 8 to move upward to complete the short-circuit opening.

[0081] When the double - moving - contact circuit breaker needs to be closed after normal opening, the closing coil 3 of the permanent - magnet mechanism 2 is energized, and the moving iron core 4 generates a downward acting force, pushing the main moving contact 8 downward. After the main moving contact 8 collides with the driven moving contact, the cross bracket 14 separates from the closing stopper, and the two contacts move downward together with the mechanism over - travel until the moving iron core 4 adsorbs on the magnetic yoke 5, completing the closing operation;

[0082] When the double - moving - contact circuit breaker needs to be closed after short - circuit opening, first an upward repulsive force is generated in the repulsive force disc 11, driving the cross bracket 14 and the secondary moving contact 9 upward. After the cross bracket 14 contacts the closing stop member 13, the closing operation after normal opening is then carried out.

[0083] In one embodiment, the double - moving - contact circuit breaker is of a symmetrical structure.

[0084] In one embodiment, as Figure 1 shown, a double - moving - contact circuit breaker jointly driven by a permanent - magnet mechanism and a repulsive force mechanism and its control strategy include a circuit breaker structure jointly composed of a permanent - magnet mechanism 2, a repulsive force mechanism 16, and a double - moving - contact arc - extinguishing chamber 7;

[0085] The permanent - magnet mechanism 2 includes,

[0086] A magnetic yoke 5,

[0087] A tripping coil 1, which is arranged inside the magnetic yoke 5 and provides a driving force for the moving iron core 4 during tripping,

[0088] A closing coil 3, which is arranged inside the magnetic yoke 5 and is at the other end of the tripping coil 1, and provides a driving force for the moving iron core 4 during closing,

[0089] A moving iron core 4, which is arranged inside the tripping coil 1 and the closing coil 3 and can shuttle between the tripping coil 1 and the closing coil 3 to achieve tripping and closing operations. In the closed state, it adsorbs on the magnetic yoke 5,

[0090] A permanent - magnet mechanism insulating pull rod 6, which is connected to the moving iron core 4.

[0091] The repulsive force mechanism 16 includes,

[0092] A cross bracket 14,

[0093] A bistable spring 15, which is arranged at both ends of the cross bracket 14 and provides a tripping and closing holding force for the repulsive force mechanism,

[0094] A repulsive force mechanism main shaft 12, which is arranged on the cross bracket 14 and is perpendicular to the cross bracket 14, and is used to connect each component in the repulsive force mechanism to transfer kinetic energy,

[0095] Closing stop member 13 is disposed on the outer ring of the repulsion mechanism main shaft 12 and above the cross bracket 14, and is used for stopping during the closing process of the repulsion mechanism 16 to control the distance that the bistable spring 15 pushes the cross bracket 14 upward.

[0096] Repulsion disk 11 is disposed on the repulsion mechanism main shaft 12 and provides the power for the repulsion mechanism to close and open.

[0097] Repulsion mechanism insulating pull rod 10 is disposed on the repulsion mechanism main shaft 12.

[0098] The double - acting contact arc - extinguishing chamber 7 includes

[0099] Porcelain shell

[0100] Active contact 8 is disposed inside the porcelain shell and is connected to the permanent magnet mechanism 2 through the permanent magnet mechanism insulating pull rod 6.

[0101] Sub - active contact 9 is disposed inside the porcelain shell and is connected to the repulsion mechanism 16 through the repulsion mechanism insulating pull rod 10.

[0102] The insulation voltage grades of the permanent magnet mechanism insulating pull rod 6 and the repulsion mechanism insulating pull rod 10 are not lower than the insulation voltage grade of the vacuum arc - extinguishing chamber.

[0103] When the double - acting contact circuit breaker commonly driven by the permanent magnet mechanism 2 and the repulsion mechanism 16 is in the closing state, the moving iron core 4 is adsorbed on the magnetic yoke 5, the holding force of the bistable spring 15 of the repulsion mechanism 16 is less than the suction force provided by the magnetic yoke 5, the active contact 8 and the driven contact are pressed against each other, and the cross bracket 14 of the repulsion mechanism 16 is 5 mm below the closing stop member 13, and this distance is the mechanism over - travel.

[0104] As Figure 2 shown, when opening normal current, only the permanent magnet mechanism 2 operates. The stroke of the permanent magnet mechanism 2 is 60 mm. Due to the existence of 5 mm over - travel, the opening distance between the active contact 8 and the sub - active contact 9 in the normal opening state is 55 mm.

[0105] As Figure 3 shown, when opening short - circuit current, the permanent magnet mechanism 2 and the repulsion mechanism 16 operate together. The stroke of the permanent magnet mechanism 2 is 60 mm, and the stroke of the repulsion mechanism is 30 mm. Therefore, in the fault opening state, the opening distance between the active contact 8 and the sub - active contact 9 is 85 mm.

[0106] As Figure 4As shown, during the closing process, when the main moving contact 8 just touches the secondary moving contact 9, there is an overtravel of 5 mm between the moving iron core 4 and the magnetic yoke 5, and the cross bracket 14 contacts the closing stop 13; on the other hand, during the normal opening process, when the permanent magnet mechanism moves upward by 5 mm, the structure of the circuit breaker is also as Figure 4 shown.

[0107] The circuit breaker control strategy is as follows:

[0108] When the circuit breaker needs to interrupt normal current, only the permanent magnet mechanism 2 is used to drive the moving contact to move. Under the condition of ensuring normal interruption, the loss of the circuit breaker is reduced as much as possible. At this time, the position changes of each component of the circuit breaker can be represented with reference to the attached drawings as Figures 1 to 4 to Figure 2 ;

[0109] The specific process is as follows: The opening coil 1 of the permanent magnet mechanism 2 is energized, and an upward pulling force is generated in the moving iron core 4 to pull the main moving contact 8 upward. At this time, the secondary moving contact 9 moves upward together with the main moving contact 8 under the push of the repulsion mechanism 16. When the cross bracket 14 contacts the closing stop 13, the secondary moving contact 9 stops moving, and the main moving contact 8 separates from the secondary moving contact 9 and continues to move upward under the pull of the moving iron core 4 to achieve the opening function;

[0110] When the circuit breaker needs to interrupt short-circuit current, the permanent magnet mechanism 2 and the repulsion mechanism 16 drive the moving contact to move at the same time. Through the cooperation between the permanent magnet mechanism 2 and the repulsion mechanism 16, the main moving contact 8 and the secondary moving contact 9 are quickly separated to achieve the rapid interruption of short-circuit current. At this time, the position changes of each component of the circuit breaker can be represented with reference to the attached drawings as Figure 1 -> Figure 3 ;

[0111] The specific process is as follows: The repulsion disk generates a downward acting force to drive the secondary moving contact 9 downward. After the secondary moving contact 9 moves for a certain time, the moving iron core 4 drives the main moving contact 8 upward to complete the short-circuit opening;

[0112] When it needs to be closed after normal interruption, the permanent magnet mechanism 2 is directly used to drive the moving contact to close. At this time, the position changes of each component of the circuit breaker can be represented with reference to the attached drawings as Figures 2 to 4 to Figure 1 ;

[0113] The specific process is that the closing coil 3 of the permanent magnet mechanism 2 is energized, and the moving iron core 4 generates a downward acting force to push the main moving contact 8 downward. When the main moving contact 8 collides with the driven contact, the cross bracket 14 separates from the closing stopper, and the two contacts move downward by 5 mm until the moving iron core 4 adsorbs on the magnetic yoke 5 to complete the closing operation;

[0114] When reclosing is required after short-circuit interruption, first use the repulsive force mechanism 16 to drive the moving contact to close. At this time, it returns to the state before closing after normal interruption, and then use the permanent magnet mechanism 2 to drive the moving contact to close. This can avoid the impact on the life caused by the contact impact during the rapid closing of the repulsive force mechanism. At this time, the position changes of each component of the circuit breaker can be represented with reference to the attached drawings as Figures 3 to 2 to Figures 4 to 1 .

[0115] The specific process is as follows: First, generate an upward repulsive force in the repulsive force disk, driving the cross bracket 14 and the secondary moving contact 9 to move upward. When the cross bracket 14 contacts the closing stop member 13, then perform the closing operation after normal interruption.

[0116] The double-moving-contact arc extinguishing chamber includes a porcelain shell, a main moving contact 8 disposed inside the porcelain shell and driven to move by the permanent magnet mechanism 2, and a secondary moving contact 9 disposed inside the porcelain shell and driven to move by the repulsive force mechanism 16. This design allows the two moving contacts to operate independently, improving the flexibility and reliability of the equipment.

[0117] The permanent magnet mechanism 2 includes a magnetic yoke 5, a tripping coil 1 disposed inside the magnetic yoke 5 to provide a driving force for the moving iron core 4 during tripping, a closing coil 3 disposed inside the magnetic yoke 5 and at the other end of the tripping coil 1 to provide a driving force for the moving iron core 4 during closing, a moving iron core 4 disposed inside the tripping coil 1 and the closing coil 3 and shuttling between the tripping coil 1 and the closing coil 3 to achieve opening and closing operations, and adsorbing on the magnetic yoke 5 in the closed state. One end of the insulating rod 6 of the permanent magnet mechanism is connected to the moving iron core 4, and the other end is connected to the main moving contact 8.

[0118] The permanent magnet mechanism drives the moving contact to perform opening and closing operations through electromagnetic force, ensuring fast and reliable switching actions. The design of the insulating rod ensures electrical isolation between the primary and secondary sides.

[0119] The repulsive force mechanism 16 includes a cross bracket 14, a bistable spring 15 disposed at both ends of the cross bracket 14 to provide opening and closing holding forces for the repulsive force mechanism, a main shaft 12 of the repulsive force mechanism disposed on the cross bracket 14 and perpendicular to the cross bracket 14 for transmitting kinetic energy, a closing stop member 13 disposed outside the main shaft 12 of the repulsive force mechanism and above the cross bracket 14, and the closing stop member 13 is used for stopping during the closing process of the repulsive force mechanism 16 to control the upward distance that the bistable spring 15 pushes the cross bracket 14, a repulsive force disk 11 disposed on the main shaft 12 of the repulsive force mechanism to provide opening and closing power for the repulsive force mechanism, and an insulating rod 10 of the repulsive force mechanism disposed on the main shaft 12 of the repulsive force mechanism and connected to the secondary moving contact 9.

[0120] The repulsive force mechanism drives the secondary moving contact to perform opening and closing operations through mechanical force, ensuring fast response and high reliability. The bistable spring provides a stable opening and closing holding force, enabling the mechanism to stably maintain at the opening and closing positions respectively.

[0121] The insulation voltage level of the permanent magnet mechanism insulating pull rod 6 and the repulsive force mechanism insulating pull rod 10 is not lower than that of the double - acting contact arc - extinguishing chamber 7. This design ensures the electrical isolation between the primary and secondary sides and improves the safety of the system.

[0122] Mechanism over - travel: When in the closed state, the moving iron core 4 is adsorbed on the magnetic yoke 5. The holding force of the bistable spring 15 is less than the suction force provided by the magnetic yoke 5. The main contact 8 and the sub - moving contact 9 are pressed against each other. The distance between the cross bracket 14 and the closing stop 13 is the mechanism over - travel of 5 mm.

[0123] The design of the mechanism over - travel enables the two contacts to move in the same direction for a certain distance and then stop when closing and colliding, greatly reducing the collision rigidity during closing and improving the mechanical life of the moving contact and each transmission part, especially the pull rod.

[0124] Stroke and opening distance: The stroke of the permanent magnet mechanism 2 is 60 mm, and the opening distance between the main contact 8 and the sub - moving contact 9 in the normal open state is 55 mm; the stroke of the repulsive force mechanism 16 is 30 mm, and the opening distance between the main contact 8 and the sub - moving contact 9 is 85 mm.

[0125] Precisely controlling the stroke and opening distance can ensure that the circuit breaker can reliably close and open in different working states, while reducing unnecessary mechanical stress.

[0126] In the control method,

[0127] Opening normal current: The opening coil 1 of the permanent magnet mechanism 2 is energized, and the moving iron core 4 generates an upward pulling force to pull the main contact 8 upward. At this time, the sub - moving contact 9 moves upward together with the main contact 8 under the push of the repulsive force mechanism 16. When the cross bracket 14 touches the closing stop 13, the sub - moving contact 9 stops moving, and the main contact 8 separates from the sub - moving contact 9 and continues to move upward under the pull of the moving iron core 4 to achieve the opening function.

[0128] This single - side action mode reduces mechanical stress and extends the equipment life.

[0129] Opening short - circuit current: The repulsive force disk 11 generates a downward acting force to drive the sub - moving contact 9 to move downward. After the sub - moving contact 9 acts for a certain time, the moving iron core 4 drives the main contact 8 to move upward to complete the short - circuit opening.

[0130] In case of a fault, the simultaneous action can quickly form a sufficient opening distance to ensure successful and rapid opening of the short - circuit current.

[0131] Closing after normal opening, the closing coil 3 of the permanent magnet mechanism 2 is energized, and the moving iron core 4 generates a downward acting force, pushing the main contact 8 downward. After the main contact 8 collides with the driven contact, the cross bracket 14 separates from the closing stopper, and the two contacts move downward simultaneously by the mechanism overtravel until the moving iron core 4 adsorbs on the yoke 5, completing the closing operation. Unilateral closing can reduce the rigidity of the contact collision and lower the wear risk.

[0132] Closing after short-circuit opening first uses the repulsive force mechanism 16 to drive the secondary moving contact 9 to close back to the state where it will close after normal opening, and then uses the permanent magnet mechanism 2 to drive the main contact 8 to close.

[0133] This sequential operation avoids the impact on the life caused by the contact impact during the rapid closing process of the repulsive force mechanism.

[0134] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purpose of illustration and facilitation of understanding, rather than limitations, and these details do not limit the present application to necessarily adopt the above specific details for implementation.

[0135] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the form disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A double-acting contact circuit breaker driven by a common drive of a permanent magnet and a repulsive force mechanism, characterized in that, It includes a permanent magnet mechanism, a repulsive force mechanism and a double-moving contact arc extinguishing chamber. Among them, The double-moving contact arc extinguishing chamber includes a porcelain shell, a main moving contact, which is arranged inside the porcelain shell, and the main moving contact is connected and driven by the permanent magnet mechanism to move, a secondary moving contact, which is arranged inside the porcelain shell, and the secondary moving contact is connected and driven by the repulsive force mechanism to move; When the double-moving contact circuit breaker interrupts normal current, the permanent magnet mechanism drives the main moving contact to move. When the double-moving contact circuit breaker interrupts short-circuit current, the permanent magnet mechanism drives the main moving contact to move and the repulsive force mechanism simultaneously drives the secondary moving contact to move; When the double-moving contact circuit breaker closes after interruption, the permanent magnet mechanism drives the main moving contact to close. When the double-moving contact circuit breaker closes after short-circuit interruption, the repulsive force mechanism drives the secondary moving contact to close to return to the state where it is about to close after normal interruption, and then the permanent magnet mechanism drives the main moving contact to close.

2. The double-moving-contact circuit breaker with common drive of permanent magnet and repulsive force mechanism according to claim 1, characterized in that, Preferably, the permanent magnet mechanism includes a yoke, a tripping coil, which is arranged inside the yoke and provides driving force for the moving iron core during tripping, a closing coil, which is arranged inside the yoke and at the other end of the tripping coil, and provides driving force for the moving iron core during closing, a moving iron core, which is arranged inside the tripping coil and the closing coil and shuttles between the tripping coil and the closing coil to realize tripping and closing operations. In the closed state, it is adsorbed on the yoke, a permanent magnet mechanism insulating pull rod, one end of which is connected to the moving iron core and the other end is connected to the main moving contact.

3. The double-moving contact circuit breaker with common drive of permanent magnet and repulsive force mechanism as claimed in claim 2, characterized in that, The repulsive force mechanism includes a cross bracket, a bistable spring, which is arranged at both ends of the cross bracket and provides tripping and closing holding force for the repulsive force mechanism, a repulsive force mechanism main shaft, which is arranged on the cross bracket and perpendicular to the cross bracket to transfer kinetic energy, a closing stop, which is arranged on the outer circle of the repulsive force mechanism main shaft and above the cross bracket. The closing stop is used for stopping during the closing process of the repulsive force mechanism to control the distance that the bistable spring pushes the cross bracket upward, a repulsive force disc, which is arranged on the repulsive force mechanism main shaft and provides tripping and closing power for the repulsive force mechanism, a repulsive force mechanism insulating pull rod, which is arranged on the repulsive force mechanism main shaft and connected to the secondary moving contact.

4. The double - acting contact circuit breaker with common drive of permanent magnet and repulsive force mechanism as claimed in claim 3, wherein, The insulation voltage grades of the permanent magnet mechanism insulating pull rod and the repulsive force mechanism insulating pull rod are not lower than the insulation voltage grade of the double-moving contact arc extinguishing chamber.

5. The double-moving contact circuit breaker with common drive of permanent magnet and repulsive force mechanism according to claim 3, characterized in that, When in the closed state, the moving iron core is adsorbed on the yoke, the holding force of the bistable spring is less than the suction force provided by the yoke, the main moving contact and the secondary moving contact are pressed against each other, and the distance of the cross bracket below the closing stop is the mechanism overtravel.

6. The double-moving contact circuit breaker with common drive of permanent magnet and repulsive force mechanism according to claim 5, characterized in that, The mechanism overtravel is 5 mm.

7. The double-moving contact circuit breaker with common drive of permanent magnet and repulsion mechanism according to claim 6, characterized in that, The stroke of the permanent magnet mechanism is 60 mm, and the opening distance between the main moving contact and the secondary moving contact in the normal tripping state is 55 mm.

8. The double-moving contact circuit breaker with common drive of permanent magnet and repulsive force mechanism according to claim 7, characterized in that, The stroke of the repulsive force mechanism is 30 mm, and the opening distance between the main moving contact and the secondary moving contact is 85 mm.

9. The double - acting contact circuit breaker with common drive of permanent magnet and repulsive force mechanism as claimed in claim 1, wherein, The central axes of the main moving contact and the secondary moving contact are collinear.

10. The control method of the double-moving contact circuit breaker commonly driven by the permanent magnet and repulsive force mechanisms according to any one of claims 3-8.

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