A smart circuit breaker on-off control mechanism and a smart circuit breaker

Abstract

The utility model discloses a kind of on-off control mechanism of intelligent circuit breaker and intelligent circuit breaker, it is related to power grid protection equipment technical field, and on-off control mechanism includes shell, vacuum tube, conducting rod, conducting rod includes first pole body and second pole body being set in direct opposite, in first pole body and second pole body two, each is configured with the contact of cooperation with another, each is connected with vacuum tube, contact is located in vacuum tube, flexible connection structure located in the outside of vacuum tube is connected on first pole body and second pole body, flexible connection structure is: flexible connection structure on first pole body as conducting structure, and elastic deformation can be generated in the length direction of conducting rod;The upper end of first pole body extends to the outside of the upper end of shell, and flexible connection structure on first pole body is connected in series on first pole body.The intelligent circuit breaker includes the mechanism, and the structure provided in the present application has the characteristics of simple structure and can be used in existing fuse structure.

Description

Technical Field

[0001] This utility model relates to the field of power grid protection equipment technology, and in particular to an intelligent circuit breaker on / off control mechanism and an intelligent circuit breaker. Background Technology

[0002] Medium-voltage fuses are the most commonly used protection device in 3-35kV power distribution lines. The core component of existing fuses includes the fuse element (fuse wire). The working principle is that when the current in the line exceeds the rated current, the circuit is cut off by the physical melting of the fuse wire, thus providing protection for the line. Therefore, after each fuse triggers the protection action, restoration requires manual on-site removal of the fuse element and replacement of the fuse wire before the line function can be restored. In application, the advantages of fuses are good selectivity, strong breaking capacity, small size, and low price. The disadvantages are that the fuse element has a long recovery time, the melting time is greatly affected by the ambient temperature and current magnitude, and a single-phase cut-off may have adverse effects on the distribution network equipment and electrical equipment. Therefore, conventional fuses may have problems such as slow protection action speed for power distribution lines, severe arcing during action, inability to remotely alarm and control, and inability to remotely read parameters.

[0003] To address the limitation of conventional fuses in their single circuit-breaking method, existing technologies have developed drop-out fuses with actuators. In such solutions, the actuator triggers the fuse tube, causing the upper end of the fuse tube to separate from the stationary contact at the upper end of the fuse, thus breaking the power distribution line. Specific solutions are provided in patent applications CN202310917008.3 and CN202410806378.4. Other existing technologies employ a shearing method, where the fuse element is sheared, thereby breaking the power distribution line. Specific solutions are provided in patent application CN202311629206.6.

[0004] To achieve the purpose of short circuit and overload protection for power distribution lines, intelligent circuit breakers are another important protection device, distinct from fuses. The working principle of intelligent circuit breakers differs from that of fuses: intelligent circuit breakers provide protection by disconnecting the circuit through contact action triggered by a collected signal, and can quickly restore normal power supply through closing action after the fault is cleared. In addition, intelligent circuit breakers also have the characteristics of fast action speed and reusability. Existing circuit breakers include the technical solutions provided in patent documents such as patent application numbers CN201410386519.8 and CN201910329667.9.

[0005] Protection equipment for power distribution lines is crucial for protecting electrical equipment, distribution equipment, and personnel safety within the power grid. To enhance the flexibility and reliability of protection equipment, it is necessary to further optimize related technologies. Utility Model Content

[0006] To address the aforementioned issue of further optimizing power distribution line protection equipment, this utility model provides an intelligent circuit breaker on / off control mechanism and an intelligent circuit breaker. The on / off mechanism is a component of the circuit breaker, and the structure provided in this solution is simple and can be applied to existing fuse structures.

[0007] To address the aforementioned problems, this utility model provides an intelligent circuit breaker on / off control mechanism and an intelligent circuit breaker, which solves the problems through the following technical points: An intelligent circuit breaker on / off control mechanism includes an outer shell, a vacuum tube fixed in the outer shell, and a conductive rod connected to the vacuum tube. The conductive rod includes a first rod body and a second rod body arranged opposite each other. Each of the first rod body and the second rod body is equipped with a contact that cooperates with the other. Each is connected to the vacuum tube, and the contacts are all located in the vacuum tube. Both the first rod body and the second rod body are connected to a flexible connection structure located outside the vacuum tube. The flexible connection structure is: the flexible connection structure on the first rod body serves as a conductive structure and can elastically deform in the length direction of the conductive rod.

[0008] The upper end of the first rod extends to the outside of the upper end of the outer shell, and a flexible connecting structure on the first rod is connected in series with the first rod.

[0009] In one specific embodiment, the second rod and the flexible connection structure thereon are configured such that: the lower end of the second rod is connected to the base of the conductive plate through the flexible connection structure, and when the contacts of the two are in a through-contact state, the flexible connection structure is in an elastic compression state, which can keep the lower end of the base flush with the bottom surface of the outer shell.

[0010] In application, this solution serves as the on / off control mechanism on a circuit breaker. Specifically, the contacts of both the first and second rods act as contacts for carrying the load current. Both the first and second rods can be made of copper. The contacts are silver-based alloys or other metals with low contact resistance, mounted on the corresponding rods. A drive mechanism based on an electromagnetic actuator can be used. For example, the circuit breaker includes a fixed base, a top plate connected to the upper end of the fixed base, and a bottom plate connected to the lower end of the fixed base. The top plate connects to the power supply side, and the bottom plate connects to the user side. A contact plate is elastically supported on the top plate, and the outer casing is supported between the bottom plate and the contact plate. The lower end of the outer casing and the lower end of the base are both supported on the bottom plate, and the upper end of the first rod is supported on the contact plate. The flexible connection structure of both is in an elastically compressed state, allowing the electromagnetic coil fixed relative to the outer casing to conduct current. After the current is applied, the position of the second rod is changed by the moving iron core installed on the second rod. When the electromagnetic coil drives the second rod to move towards the side where the first rod is located through the moving iron core, the two contacts make contact and cooperate to form a closed circuit, and the conductive rod is conductive. When the electromagnetic coil drives the second rod to move away from the first rod through the moving iron core, the two contacts separate and cooperate to form a closed circuit, and the conductive rod is disconnected. In specific applications, after being installed on a circuit breaker, the upper end of the first rod contacts and presses against the contact plate, and the lower end of the second rod contacts and presses against the base plate through a flexible connection structure and the base. When the conductive rod is in the closed circuit state (continuous contact state), the circuit breaker is conducting the circuit. When the conductive rod is in the open circuit state (disconnected state), the circuit breaker is disconnecting the circuit.

[0011] The vacuum tube serves as the connection mechanism between the conductive rod and the outer casing, and provides a vacuum environment for the contacts. Specifically, a vacuum switch is formed on this mechanism to shorten the arc time when the circuit is broken, improve the pressure resistance and breaking capacity, and ensure service life and reliability. In the above application, the driving mechanism acts on the second rod. The connection between the second rod and the vacuum tube often uses corrugated pipes, such as metal corrugated pipes or diaphragm elastic metal plates, which adapt to the movement of the second rod relative to the vacuum tube by deformation.

[0012] Unlike existing technologies, this solution features flexible connection structures on both the first and second rods. These flexible connection structures allow for adjustable lengths of both the first and second rods. For example, in the above application, the flexible connection structure for the second rod adapts to positional changes under the action of the driving mechanism, maintaining its ability to recover deformation under elastic compression in any state. This ensures stable electrical connection between the base and the bottom plate (the second rod is supported between the vacuum tube and the base via the flexible connection structure and, for example, a metal bellows). In other words, the flexible connection structure on the second rod serves as both a conductive structure and an electrical connection compensation structure. The flexible connection structure on the first rod is used to: during the embedding process between the contact plate and the bottom plate, the flexible connection structure on the first rod changes the length of the mechanism through elastic compression, facilitating the insertion of the mechanism. The mechanism is embedded between the contact plate and the base plate. Simultaneously, the force between the first rod and the outer casing is transmitted through the vacuum tube. The shortened length of this mechanism reduces the stress on the vacuum tube during this process (vacuum tubes are often made of ceramic materials), thus protecting the vacuum tube. For example, when replacing a fuse-based on / off control mechanism with this mechanism, the vacuum tube is a relatively fragile component compared to the fuse tube. During the process of the upper end of the first rod embedding into the groove on the contact plate, this solution uses a flexible connecting structure on the first rod to further compress and then rebound a portion of the deformation, effectively reducing the pressure exerted by the first rod on the vacuum tube during this process. Therefore, this solution is suitable for replacing existing on / off control mechanisms on circuit breakers using fuse tubes. Regarding the elastic support configured for the contact plate, this mechanism can effectively protect the vacuum tube during installation. This solution is not only simple in structure but also has the characteristic of being applicable to existing fuse structures.

[0013] As those skilled in the art, the above limitations on the second rod and its flexible connection structure are intended to limit the mechanism so that when the second rod moves toward the first rod and their contacts come into contact, the lower end of the base can still be flush with the bottom surface of the outer shell under the elastic compression state of the flexible connection structure on the second rod. Thus, when the mechanism is installed between the contact plate and the base plate, the second rod can maintain a state of contact and compression between the base plate and the base, and between the first rod and the contact plate, at any position. In this state, the outer shell is also supported on the base plate. To establish an electrical connection between the base and the base plate, the method is not limited to this. For example, when used as a rotatable connection between the base and the base plate, the rotatable connection is used to achieve: the mechanism can be rotatably installed on the base plate, and the mechanism can be pulled by the pull ring assembly to configure the corresponding circuit breaker as a drop-out circuit breaker; after the mechanism is installed on the circuit breaker, if it is not considered to support the mechanism on a flat base plate, it is not required that the lower end of the base and the lower end of the outer shell are on the same plane.

[0014] Unlike the flexible connection structure on the first rod, the flexible connection structure on the second rod only needs to be flexible if it is only required to adapt to changes in the position of the second rod.

[0015] A further technical solution for the circuit breaker on / off control mechanism is as follows:

[0016] It also includes a drive mechanism for changing the contact engagement state, the drive mechanism being an electromagnetic driver comprising a housing, a moving iron core, and an electromagnetic coil;

[0017] The housing is fixed inside the outer shell, the moving iron core is fixed to the second rod, and the electromagnetic coil is fixed to the housing.

[0018] In the above scheme, when it is necessary to change the opening and closing state of this mechanism, it is only necessary to energize the electromagnetic coil so that the moving iron core provides a driving force in the corresponding direction to the second rod under the action of the electromagnetic coil. Unlike the repulsion disk that is widely used in the present, the driving mechanism has the characteristics of small size and simple structure.

[0019] Both ends of the electromagnetic coil are equipped with permanent magnet modules, and each permanent magnet module includes a first permanent magnet and a second permanent magnet.

[0020] Any permanent magnet module consists of: a first permanent magnet fixed to the shell and a second permanent magnet fixed to the second rod.

[0021] When the first permanent magnet and the second permanent magnet on the permanent magnet module at one end of the electromagnetic coil attract each other, the first permanent magnet and the second permanent magnet on the permanent magnet module at the other end of the electromagnetic coil maintain a state of maximum distance away from each other.

[0022] When the first permanent magnet and the second permanent magnet on the permanent magnet module close to the first rod attract each other, the contacts cooperate to form a closed contact state; when the first permanent magnet and the second permanent magnet on the permanent magnet module far from the first rod attract each other, the contacts cooperate to form a closed isolation state.

[0023] The above solution provides a specific second rod position holding mechanism. For example, when it is necessary to switch this mechanism from the open state to the closed state, it is only necessary to energize the electromagnetic coil, so that the moving iron core provides a force to the second rod to move towards the first rod under the action of the electromagnetic coil. During this process, the second permanent magnet fixed on the second rod moves synchronously with the second rod. For the permanent magnet module on the side of the electromagnetic coil closer to the first rod, the distance between the second permanent magnet and the first permanent magnet decreases, and the magnetic force between the second permanent magnet and the first permanent magnet continuously increases. As the permanent magnet module on the side of the electromagnetic coil furthest from the first rod increases in distance between the second and first permanent magnets, the magnetic force between them continuously decreases. When their contacts make contact, the first and second permanent magnets on the permanent magnet module closer to the first rod are in an attractive state, while the first and second permanent magnets on the other permanent magnet module are in a state of maximum distance. When the power supply to the electromagnetic coil is disconnected, the contacts of both modules, under the influence of the permanent magnet module closer to the first rod... Maintaining the contact state, conversely, when switching from the closed state to the open state is required, only the electromagnetic coil needs to be energized. This causes the moving iron core, under the action of the electromagnetic coil, to provide a force to the second rod, moving it away from the first rod. During this process, the second permanent magnet fixed on the second rod moves synchronously with it. For the permanent magnet module on the side of the electromagnetic coil closer to the first rod, the distance between the second and first permanent magnets increases, and the magnetic force between them continuously decreases. For the permanent magnet module on the side of the electromagnetic coil away from the first rod, the... As the distance between the second permanent magnet and the first permanent magnet decreases, the magnetic force between the second permanent magnet and the first permanent magnet continues to increase. When the contacts of the two separate and maintain the set separation distance, the first permanent magnet and the second permanent magnet on the permanent magnet module on the side of the electromagnetic coil away from the first rod are in a mutually attracted state, while the first permanent magnet and the second permanent magnet on the other permanent magnet module are in a state of maximum distance away. At this time, after the power supply to the electromagnetic coil is disconnected, the contacts of the two remain in an interval state under the action of the permanent magnet module on the side of the electromagnetic coil away from the first rod.

[0024] This solution only requires a short-term power supply to the electromagnetic coil of the electromagnetic actuator during the switching between open and closed states. After the switch is completed, the permanent magnet module can maintain the current state of the conductive rod. From an energy supply perspective, this solution does not require a continuous power supply to the electromagnetic coil, resulting in low energy consumption during operation. Therefore, it is suitable for using a current transformer (CT) to provide energy for its operation. The locking of the two states of the conductive rod in this solution can be achieved using the corresponding permanent magnet module. Unlike the methods using spring energy storage or pin locking, this solution is not only simple in structure, but its state switching can also be completed based on the electromagnetic coil without relying on manual intervention. The switching and locking of the two states of the conductive rod in this solution can be achieved using the corresponding permanent magnet module and a basic electromagnetic drive mechanism. Unlike the methods using repulsion mechanisms or limit mechanisms, this solution is simple in structure and does not require additional transmission mechanisms for state switching and locking. Therefore, this solution also has the characteristics of high reliability.

[0025] As will be readily understood by those skilled in the art, when the contacts on both sides are in contact with each other, the first and second rods of the conductive rod remain electrically connected; when the contacts on both sides are separated by a set distance, the first and second rods of the conductive rod remain electrically disconnected. The set distance has different minimum distances depending on the specific application. For example, when this on / off control mechanism is used in a vacuum tube and connected in series on a 10KV medium-voltage line, the minimum value of the set distance can be set to 9mm. Meanwhile, the mutual attraction state is not limited to the state where the first permanent magnet and the second permanent magnet are in direct contact, but also includes the state where the first permanent magnet and the second permanent magnet are spaced apart. For example, when the magnetic force determined by the distance between the first permanent magnet and the second permanent magnet on one permanent magnet module can maintain the current position of the second rod and the first rod, while the magnetic force determined by the distance between the first permanent magnet and the second permanent magnet on the other permanent magnet module does not affect the current position of the second rod and the first rod, and the second rod is in a static state relative to the first rod, it can be considered that the first permanent magnet and the second permanent magnet on one permanent magnet module are mutually attracted, and the first permanent magnet and the second permanent magnet on the other permanent magnet module maintain a state of maximum distance away.

[0026] Meanwhile, this solution, by configuring the circuit breaker's operating mechanism to include the aforementioned drive mechanism and permanent magnet modules, reduces the size of the on / off control mechanism to only require permanent magnet modules on both sides of the electromagnetic coil. Its axial and radial volumes are relatively small. Without altering the installation foundation or compatibility with existing foundations and tools, it can replace the fuse element device on existing fuses, replacing passively protected fuses with actively protected circuit breakers. This solves the problems of needing on-site maintenance to restore the fuse element and frequent fuse replacements based on load changes. Furthermore, after replacing the existing fuse element device with this solution, since the protection provided to the power grid is active, if one of the three phases of the line trips due to a fault, the tripping information can be synchronized to the other two phases equipped with this solution via short-range wireless communication modules or long-range communication modules (such as cellular mobile communication modules) configured for the drive mechanism. The other two phases can then choose to operate or not operate based on their configuration and current operating conditions, achieving the function of simultaneous disconnection or closure of all three phases when necessary.

[0027] For a technical solution with a control module for the drive mechanism, the specific application is as follows: The sensor CT (current transformer) inputs the transformed current into the control module. The control module converts the analog signal into a digital signal, then calculates the current value of the acquired signal. If the current value exceeds the set tripping current value, the remaining action time is calculated using an inverse time curve, and the situation is reported to the master station / upper level. After the remaining action time reaches zero, if there is no signal from the master station / upper level to maintain the closed state, the control module controls the drive mechanism to change the state of the conductive rod from the closed state to the open state, records the action, and reports it to the master station / upper level. It is easy to understand that this solution can also be used with other control strategies, such as immediately performing the tripping action if the current value exceeds the set tripping current value.

[0028] The flexible connection structure includes a first connector, a flexible cable, a second connector, and an elastic element;

[0029] The flexible cable is a flexible multi-strand cable or braided cable, one end of the flexible cable is fixedly connected to the first connector, and the other end of the flexible cable is fixedly connected to the second connector.

[0030] The flexible connection structure on the first rod is as follows: for the rod segments on both sides of the first rod of the flexible connection structure, the first connecting seat is fixedly connected to the rod segment on one side, the second connecting seat is fixedly connected to the rod segment on the other side, and the elastic element supports and fixes between the two rod segments;

[0031] The flexible connection structure on the second rod is as follows: the first connecting seat is fixedly connected to the lower end of the second rod, the second connecting seat is fixedly connected to the base, and the elastic element is supported between the second rod and the base.

[0032] The above solution provides a flexible connection structure with good elasticity. Specifically, the flexible cable and elastic element serve as the flexible and elastic parts of the flexible connection structure. The first and second connecting seats serve as the mounting seats on the flexible connection structure. The first and second connecting seats can be made of metal rings with low resistivity, such as copper rings or silver-based alloy rings. When applied to the first pole, the first and second connecting seats can be fixed by welding them to the corresponding pole segments. When applied to the second pole, the first connecting seat is fixedly connected to the end of the second pole by welding, and the second connecting seat is fixedly connected to the base by welding. When applied to a circuit breaker, the base is supported on the base plate. In this way, the flexible cable... Through flexible deformation, the elastic element adapts to the relative position of the first and second connecting seats through elastic deformation. For the flexible connection structure on the first rod, after this scheme is installed on the circuit breaker, the elastic element is in a state of compression deformation. During the installation of this scheme on the circuit breaker, the elastic element undergoes greater compression deformation to facilitate the installation of this scheme and protect the vacuum tube. For the flexible connection structure on the second rod, after this scheme is installed on the circuit breaker, when the contacts are in the open or closed state, the elastic element is in a state of compression deformation. This feature allows the mechanism to be clamped by the contact plate and base plate as described above. By using the pull ring assembly connected to the upper end of the outer casing, the pull ring assembly can be hooked with a hook to achieve manual opening.

[0033] If manual tripping is not considered, a better equivalent solution is: when the contacts are in the closed state, the elastic element on the second rod is in a free state or in a tensile deformation state that can maintain the contact quality between the base and the bottom plate, preferably in a tensile deformation state, so as to reduce the impact of the closing action on the contacts and vacuum tube by storing energy.

[0034] The flexible connection structure includes a first connector, a stack, and a second connector. The stack includes multiple conductive sheets stacked in phase. The conductive sheets are metal sheets with arc-shaped bends. One end of the stack is fixedly connected to the first connector, and the other end of the stack is fixedly connected to the second connector.

[0035] The flexible connection structure on the first rod is as follows: for the rod segments on both sides of the first rod of the flexible connection structure, the first connecting seat is fixedly connected to the rod segment on one side, and the second connecting seat is fixedly connected to the rod segment on the other side.

[0036] The flexible connection structure on the second rod is as follows: the first connecting seat is fixedly connected to the lower end of the second rod, and the second connecting seat is fixedly connected to the base.

[0037] Parallel to the above, the above scheme provides a flexible connection structure with good elasticity. Specifically, the laminate serves as both a flexible and elastic structure within the flexible connection structure. The first and second connecting seats serve as mounting seats within the flexible connection structure. The first and second connecting seats can be made of low-resistivity metal rings such as copper rings or silver-based alloy rings. When applied to the first rod, the first and second connecting seats can be fixed by welding them to the corresponding rod segments. When applied to the second rod, the first connecting seat is fixedly connected to the end of the second rod by welding, and the second connecting seat is fixedly connected to the base by welding. When applied to a circuit breaker, the base is supported on a base plate. Thus, the laminate, through elastic deformation... To adapt to the relative positions of the first and second connecting seats, for the flexible connection structure on the first rod, after this scheme is installed on the circuit breaker, the laminate is in a state of compression deformation. During the installation of this scheme on the circuit breaker, the laminate undergoes greater compression deformation to facilitate the installation of this scheme and protect the vacuum tube. For the flexible connection structure on the second rod, after this scheme is installed on the circuit breaker, if the use of the pull ring assembly for manual tripping is not considered, preferably, when the contact is in the tripping state, the laminate is in a state of compression deformation, and when the contact is in the closing state, the laminate is in a free state or a tensile deformation state that can maintain the contact quality between the base and the base plate. The tensile deformation state is preferred, so as to reduce the impact of the closing action on the contact and vacuum tube through energy storage.

[0038] In the above two schemes, the ends of the flexible cable and the stacked layer are welded to the first connector and the second connector, or the ends of the flexible cable and the stacked layer are encapsulated in the first connector and the second connector. The elastic element can be a helical spring, and the conductive sheet of the stacked layer can adopt an ellipsoidal thin shell structure. The arc bend on it can make it have stable elastic properties, deformation properties and the ability to maintain the position of the second rod in its radial direction.

[0039] It also includes a control module for controlling the drive mechanism, and a detection transformer for sampling the current on the conductive rod, wherein the signal output terminal of the detection transformer is connected to the signal input terminal of the control module.

[0040] This solution involves the control module acquiring the detection results from the current transformer and comparing them with a set current threshold. If the current on the current conductive rod is less than the set current threshold, the contacts maintain their current open contact state. If the current on the current conductive rod is greater than or equal to the set current threshold, the electromagnetic coil drives the second rod through the moving iron core to move, causing the contacts to engage in a circuit-breaking isolation state. A preferred application is a communication module within the control module. This allows for communication between different phases of the circuit breaker control mechanism, communication between the control mechanism and the main station or higher-level authority, and communication between the control mechanism and the handheld terminal of maintenance personnel. This communication can transmit control signals to the drive mechanism, enabling it to perform opening and closing actions. It can also transmit locally acquired data, circuit breaker configuration data, and other human-machine interface data. For those skilled in the art, this control logic does not require improvements to the computer program based on existing technology.

[0041] It also includes a power supply module for providing electrical energy to the drive mechanism. The power supply module includes an energy harvesting transformer that cooperates with the conductive rod, and a storage battery that is electrically connected to the energy harvesting transformer. The energy harvesting transformer is an energy harvesting element that is based on electromagnetic induction and draws power from the magnetic field of the conductive rod. The storage battery is used to store the electrical energy collected by the energy harvesting transformer and to supply power to the electromagnetic coil.

[0042] This solution is used to provide power supply for the on / off control mechanism under the usage scenario. The power transformer is used to draw power from the line used by the on / off control mechanism, and the battery is used to store the acquired power to provide a stable and reliable power supply for the control module and drive mechanism.

[0043] Each permanent magnet module is equipped with a flexible pad. For any permanent magnet module, when the first permanent magnet and the second permanent magnet attract each other, the flexible pad acts as an elastic pad layer between the first permanent magnet and the second permanent magnet and undergoes compressive elastic deformation.

[0044] In this solution, during the operation of the drive mechanism, the flexible pad isolates rigid impacts, ensuring a small gap between the first and second permanent magnets when they attract each other, thus maintaining sufficient magnetic force to hold the second rod in position. That is, the flexible pad provides flexible impact protection for the permanent magnet module or other components in this solution by undergoing compressive elastic deformation. During the closing process, it undergoes a specific amount of compressive elastic deformation based on the displacement of the second rod, ensuring reliable contact quality of the contacts when the first and second permanent magnets attract each other.

[0045] It also includes a pull ring assembly connected to the upper end of the housing, the pull ring assembly having a pull ring hole for a hook to be hooked onto the pull ring assembly. This solution aims to achieve a tripping operation in case of a drive mechanism failure, specifically by using an operating rod such as an insulating rod with a hook at the top to pull the pull ring assembly to remove the mechanism from the series connection in the circuit.

[0046] This solution also relates to an intelligent circuit breaker, including a fixed base, a top plate connected to the upper end of the fixed base, and a bottom plate connected to the lower end of the fixed base. The top plate is provided with a contact plate elastically supported on the top plate, and also includes the on / off control mechanism as described in any of the above.

[0047] The outer shell is supported between the base plate and the contact plate: the lower end of the outer shell is supported on the base plate, the upper end of the first rod is supported on the contact plate, the second rod is electrically connected to the base plate, and the flexible connection structure on the first rod is in an elastic compression state.

[0048] As is easily understood, this solution is a specific application of the on / off control mechanism in a circuit breaker, that is, providing a circuit breaker including the on / off control mechanism. Preferably, the outer surface of the housing is provided with multiple flanges distributed at different axial positions on the housing. These flanges are annular protrusions on the outer surface of the housing, used to increase the creepage distance on the outer surface of the housing.

[0049] This utility model has the following beneficial effects:

[0050] In this solution, the flexible connection structure on the first rod changes the length of the mechanism through elastic compression, making it easy to embed the mechanism between the contact plate and the base plate. At the same time, the force between the first rod and the outer shell is transmitted through the vacuum tube. The shortening of the length of this mechanism can reduce the stress on the vacuum tube during this process (vacuum tubes are mostly made of ceramic materials), thus protecting the vacuum tube. This solution is suitable for replacing the on / off control mechanism on existing circuit breakers that use fuse tubes. For the elastic support configured for the contact plate, this mechanism can effectively protect the vacuum tube during installation. This solution is not only simple in structure, but also has the characteristic of being applicable to existing fuse structures. Attached Figure Description

[0051] Figure 1 This is a structural schematic diagram of a specific embodiment of the intelligent circuit breaker described in this solution, in which the outer casing is partially cross-sectionally viewed.

[0052] Figure 2 This is a cross-sectional view of a specific embodiment of the intelligent circuit breaker on / off control mechanism described in this solution;

[0053] Figure 3 This is a schematic diagram of a specific application embodiment of the flexible connection structure described in this solution;

[0054] Figure 4 This is a structural diagram illustrating a specific application embodiment of the flexible connection structure described in this solution. Figure 3 There is a difference. Figure 3 Flexible cables are used in the middle. Figure 4 Layering is used in the middle;

[0055] Figure 5 for Figure 2 A magnified view of part A in the middle;

[0056] Figure 6 This is a cross-sectional view showing the connection relationship between the flexible connection structure and the first rod in a specific embodiment of the intelligent circuit breaker on / off control mechanism described in this solution.

[0057] The reference numerals in the attached figures are as follows: 1. Fixed base; 2. Top plate; 3. Contact plate; 4. Pull ring assembly; 5. Outer shell; 6. Flange; 7. Drive mechanism; 71. Housing; 72. First permanent magnet; 73. Second permanent magnet; 74. Electromagnetic coil; 75. Moving iron core; 76. Flexible pad; 8. Control module; 9. Energy harvesting transformer; 10. Conductive rod; 101. First rod body; 102. Vacuum tube; 103. Metal bellows; 104. Second rod body; 105. Elastic element; 106. First connecting seat; 107. Flexible cable; 108. Second connecting seat; 109. Base; 110. Contact; 111. Stacked; 11. Detection transformer; 12. Flexible connection structure; 13. Base plate. Detailed Implementation

[0058] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments:

[0059] Example 1:

[0060] like Figures 1 to 6 As shown, an intelligent circuit breaker on / off control mechanism includes a housing 5, a vacuum tube 102 fixed in the housing 5, and a conductive rod 10 connected to the vacuum tube 102. The conductive rod 10 includes a first rod body 101 and a second rod body 104 arranged opposite each other. Each of the first rod body 101 and the second rod body 104 is provided with a contact 110 that cooperates with the other. Each is connected to the vacuum tube 102. The contacts 110 are all located in the vacuum tube 102. Both the first rod body 101 and the second rod body 104 are connected to a flexible connection structure 12 located outside the vacuum tube 102. The flexible connection structure 12 is: the flexible connection structure 12 on the first rod body 101 serves as a conductive structure and can generate elastic deformation in the length direction of the conductive rod 10.

[0061] The upper end of the first rod 101 extends to the outside of the upper end of the outer shell 5, and the flexible connection structure 12 on the first rod 101 is connected in series with the first rod 101.

[0062] Preferably, the second rod 104 and the flexible connection structure 12 thereon are configured such that the lower end of the second rod 104 is connected to the base 109, which is a conductive plate, through the flexible connection structure 12. When the contacts 110 of the two are in a closed contact state, the flexible connection structure 12 is in an elastic compression state, which can keep the lower end of the base 109 flush with the bottom surface of the outer shell 5.

[0063] In application, this scheme serves as the on / off control mechanism on a circuit breaker. Specifically, the contacts 110 of both the first rod 101 and the second rod 104 act as contacts for carrying load current. Both the first rod 101 and the second rod 104 can be made of copper. The contacts 110 are silver-based alloys or other metals with low contact resistance, mounted on the corresponding rods. In specific applications, a drive mechanism 7 based on an electromagnetic actuator can be used. For example, the circuit breaker includes a fixed base 1, a top plate 2 connected to the upper end of the fixed base 1, and a connecting... A base plate 13 is attached to the lower end of the fixed base 1. A top plate 2 is connected to the power supply side, and the base plate 13 is connected to the user side. A contact plate 3 is elastically supported on the top plate 2. The outer shell 5 is supported between the base plate 13 and the contact plate 3. The lower end of the outer shell 5 and the lower end of the base 109 are both supported on the base plate 13, and the upper end of the first rod 101 is supported on the contact plate 3. The flexible connection structure 12 of the two is in an elastic compression state. After the electromagnetic coil 74 fixed relative to the outer shell 5 is energized, it is connected to the user side via the... The moving iron core 75 mounted on the second rod 104 changes the position of the second rod 104. When the electromagnetic coil 74 drives the second rod 104 to move towards the side where the first rod 101 is located through the moving iron core 75, the two contacts 110 make contact and cooperate to form a closed contact state, and the conductive rod 10 is conductive. When the electromagnetic coil 74 drives the second rod 104 to move away from the first rod 101 through the moving iron core 75, the two contacts 110 separate and cooperate to form a closed isolation state, and the conductive rod 10 is disconnected. Specifically... When the conductive rod 10 is installed on the circuit breaker, the upper end of the first rod 101 contacts and presses against the contact plate 3, and the lower end of the second rod 104 contacts and presses against the base plate 13 through the flexible connection structure 12 and the base 109. When the conductive rod 10 is in the state of closed contact with the contacts 110, the circuit breaker is in the state of conducting the circuit. When the conductive rod 10 is in the state of open isolation with the contacts 110, the circuit breaker is in the state of disconnecting the circuit.

[0064] The vacuum tube 102 serves as the connection mechanism between the conductive rod 10 and the outer casing 5 and provides a vacuum environment for the contact 110. Specifically, a vacuum switch is formed on this mechanism to shorten the arc time when the circuit is broken, improve the pressure resistance and breaking capacity, and ensure service life and reliability. In the above application, the driving mechanism 7 acts on the second rod 104. The connection between the second rod 104 and the vacuum tube 102 often uses corrugated pipes, such as a metal corrugated pipe 103 or a diaphragm elastic metal plate, which deforms to adapt to the movement of the second rod 104 relative to the vacuum tube 102.

[0065] Unlike existing technologies, this solution features flexible connection structures 12 connected to both the first rod 101 and the second rod 104. These flexible connection structures 12 allow for adjustable lengths of both the first rod 101 and the second rod 104. For example, in the above application, the flexible connection structure 12 for the second rod 104 adapts to positional changes under the action of the driving mechanism 7, maintaining the ability of the second rod 104 to recover its deformation under elastic compression through the flexible connection structure 12 in any state. This ensures stable electrical connection between the base 109 and the base plate 13 (the second rod 104 is supported between the vacuum tube 102 and the base 109 via the flexible connection structure 12 and a metal bellows 103). In other words, the flexible connection structure 12 on the second rod 104 serves as both a conductive structure and an electrical connection compensation structure. The flexible connection structure 12 on the first rod 101 is used to: during the embedding process between the contact plate 3 and the base plate 13, the flexible connection structure 12 on the first rod 101 elastically compresses... By altering the length of this mechanism, it is easier to embed it between the contact plate 3 and the base plate 13. Simultaneously, the force between the first rod 101 and the outer casing 5 is transmitted through the vacuum tube 102. Shortening the length of this mechanism reduces the stress on the vacuum tube 102 during this process (the vacuum tube 102 is often made of ceramic material), thus protecting it. For example, when replacing a fuse-based on / off control mechanism with this mechanism, the vacuum tube 102 is a relatively fragile component compared to the fuse tube. During the process of embedding the upper end of the first rod 101 into the groove on the contact plate 3, this solution uses the flexible connecting structure 12 on the first rod 101 to further compress and then rebound a portion of the deformation, effectively reducing the pressure exerted by the first rod 101 on the vacuum tube 102 during this process. Therefore, this solution is suitable for replacing the on / off control mechanism on existing circuit breakers using fuse tubes. Regarding the elastic support configured for the contact plate 3, this mechanism can effectively protect the vacuum tube 102 during installation. This solution is not only simple in structure but also has the characteristic of being applicable to existing fuse structures.

[0066] As those skilled in the art, the above-described limitations on the second rod 104 and the flexible connecting structure 12 thereon are intended to limit the mechanism so that when the second rod 104 moves toward the first rod 101 to the point where their contacts 110 are in contact, the lower end of the base 109 can still be flush with the bottom surface of the outer shell 5 under the elastic compression state of the flexible connecting structure 12 on the second rod 104. Thus, when the mechanism is installed between the contact plate 3 and the base plate 13, the second rod 104 can maintain contact and compression between the base plate 13 and the base 109, and between the first rod 101 and the contact plate 110, regardless of its position. In the state of contact and compression of plate 3, the outer shell 5 is also supported on the base plate 13. To establish the electrical connection between the base 109 and the base plate 13, it is not limited to this method. For example, when used, the base 109 and the base plate 13 can be rotatably connected. The rotatable connection is used to realize that: the mechanism can be rotatably installed on the base plate 13, and the mechanism can be pulled by the pull ring assembly 4 to make the corresponding circuit breaker configured as a drop-out circuit breaker; after the mechanism is installed on the circuit breaker, if it is not considered to support the mechanism on the flat base plate 13, it is not required that the lower end of the base 109 and the lower end of the outer shell 5 are on the same plane.

[0067] Unlike the flexible connection structure 12 on the first rod 101, the flexible connection structure 12 on the second rod 104 can simply be flexible if it is only required to adapt to changes in the position of the second rod 104.

[0068] Example 2:

[0069] This embodiment is a further refinement of embodiment 1:

[0070] It also includes a drive mechanism 7 for changing the engagement state of the contact 110, the drive mechanism 7 being an electromagnetic driver comprising a housing 71, a moving iron core 75, and an electromagnetic coil 74;

[0071] The housing 71 is fixed in the outer shell 5, the moving iron core 75 is fixed on the second rod 104, and the electromagnetic coil 74 is fixed on the housing 71.

[0072] In the above scheme, when it is necessary to change the opening and closing state of this mechanism, it is only necessary to energize the electromagnetic coil 74 so that the moving iron core 75 provides the second rod 104 with a driving force in the corresponding direction under the action of the electromagnetic coil 74. Unlike the repulsion disk that is widely used in the present, the driving mechanism 7 has the characteristics of small size and simple structure.

[0073] Example 3:

[0074] This embodiment is a further refinement of embodiment 2:

[0075] Both ends of the electromagnetic coil 74 are equipped with permanent magnet modules, and each permanent magnet module includes a first permanent magnet 72 and a second permanent magnet 73.

[0076] Any permanent magnet module consists of: a first permanent magnet 72 fixed to the housing 71, and a second permanent magnet 73 fixed to the second rod 104;

[0077] When the first permanent magnet 72 and the second permanent magnet 73 on the permanent magnet module at one end of the electromagnetic coil 74 attract each other, the first permanent magnet 72 and the second permanent magnet 73 on the permanent magnet module at the other end of the electromagnetic coil 74 remain in a state of maximum distance away.

[0078] When the first permanent magnet 72 and the second permanent magnet 73 on the permanent magnet module close to the first rod 101 attract each other, the contacts 110 cooperate to form a closed contact state; when the first permanent magnet 72 and the second permanent magnet 73 on the permanent magnet module away from the first rod 101 attract each other, the contacts 110 cooperate to form a closed isolation state.

[0079] The above solution provides a specific position holding mechanism for the second rod 104. For example, when it is necessary to switch this mechanism from the open state to the closed state, it is only necessary to energize the electromagnetic coil 74, so that the moving iron core 75 provides a force to the second rod 104 under the action of the electromagnetic coil 74, causing the second rod 104 to move towards the first rod 101. During this process, the second permanent magnet 73 fixed on the second rod 104 moves synchronously with the second rod 104. For the permanent magnet module on the side of the electromagnetic coil 74 closer to the first rod 101, the distance between the second permanent magnet 73 and the first permanent magnet 72 decreases, and the magnetic force between the second permanent magnet 73 and the first permanent magnet 72 continuously increases. On the permanent magnet module of the electromagnetic coil 74 away from the first rod 101, the distance between the second permanent magnet 73 and the first permanent magnet 72 increases, and the magnetic force between the second permanent magnet 73 and the first permanent magnet 72 continuously decreases. When the contacts 110 of the two make contact, the first permanent magnet 72 and the second permanent magnet 73 on the permanent magnet module of the electromagnetic coil 74 near the first rod 101 are in a mutually attracted state, while the first permanent magnet 72 and the second permanent magnet 73 on the other permanent magnet module are in a state of maximum distance away. At this time, after the power supply to the electromagnetic coil 74 is disconnected, the contacts 110 of the two are in the permanent magnet module of the electromagnetic coil 74 near the first rod 101. When the circuit is in a closed state, it is kept in a contact state. Conversely, when it is necessary to switch from the closed state to the open state, it is only necessary to energize the electromagnetic coil 74. This allows the moving iron core 75 to provide a force to the second rod 104, moving it away from the first rod 101, under the action of the electromagnetic coil 74. During this process, the second permanent magnet 73 fixed on the second rod 104 moves synchronously with the second rod 104. For the permanent magnet module on the side of the electromagnetic coil 74 closer to the first rod 101, the distance between the second permanent magnet 73 and the first permanent magnet 72 increases, and the magnetic force between the second permanent magnet 73 and the first permanent magnet 72 continuously decreases. For the permanent magnet module on the side of the electromagnetic coil 74 away from the first rod 101, the distance between the second permanent magnet 73 and the first permanent magnet 72 increases, and the magnetic force between the second permanent magnet 73 and the first permanent magnet 72 continuously decreases. In the body module, the distance between the second permanent magnet 73 and the first permanent magnet 72 decreases, and the magnetic force between the second permanent magnet 73 and the first permanent magnet 72 continues to increase. When the contacts 110 of the two are separated and maintain the set separation distance, the first permanent magnet 72 and the second permanent magnet 73 on the permanent magnet module on the side of the electromagnetic coil 74 away from the first rod 101 are in a mutually attracted state, while the first permanent magnet 72 and the second permanent magnet 73 on the other permanent magnet module are in a state of maximum distance away. At this time, after the power supply to the electromagnetic coil 74 is disconnected, the contacts 110 of the two are maintained in an interval state under the action of the permanent magnet module on the side of the electromagnetic coil 74 away from the first rod 101.

[0080] In this scheme, the switching between open and closed states only requires a short-term power supply to the electromagnetic coil 74 of the electromagnetic actuator. After the switching is completed, the permanent magnet module can maintain the current state of the conductive rod 10. From an energy supply perspective, this scheme does not require a continuous power supply to the electromagnetic coil 74, resulting in low energy consumption during operation. Therefore, it is suitable for using an energy harvesting transformer 9 (energy harvesting CT) to provide energy for its operation. The locking of the two states of the conductive rod 10 in this scheme can be achieved using the corresponding permanent magnet module. Unlike the methods of spring energy storage or pin locking, this scheme is not only simple in structure, but its state switching can also be completed based on the electromagnetic coil 74 without relying on manual intervention. The switching and locking of the two states of the conductive rod 10 in this scheme can be achieved using the corresponding permanent magnet module and the basic electromagnetic drive mechanism 7. Unlike the methods of repulsion mechanism or limit mechanism, this scheme is simple in structure and does not require other transmission mechanisms for state switching and locking. Therefore, this scheme also has the characteristics of high reliability.

[0081] As will be readily understood by those skilled in the art, when the contacts 110 on both sides are in contact with each other, the first rod 101 and the second rod 104 of the conductive rod 10 are electrically connected. When the contacts 110 on both sides are separated by a set distance, the first rod 101 and the second rod 104 of the conductive rod 10 are electrically disconnected. The set distance has different minimum distances depending on the specific application. For example, when this on / off control mechanism is used in a vacuum tube 102 and connected in series on a 10KV medium voltage line, the minimum value of the set distance can be set to 9mm. Meanwhile, the mutual attraction state is not limited to the state where the first permanent magnet 72 and the second permanent magnet 73 are in direct contact, but also includes the state where the first permanent magnet 72 and the second permanent magnet 73 are spaced apart. For example, when the magnetic force determined by the distance between the first permanent magnet 72 and the second permanent magnet 73 on one permanent magnet module can maintain the current position of the second rod 104 and the first rod 101, while the magnetic force determined by the distance between the first permanent magnet 72 and the second permanent magnet 73 on the other permanent magnet module does not affect the current position of the second rod 104 and the first rod 101, and the second rod 104 is in a stationary state relative to the first rod 101, it can be considered that the first permanent magnet 72 and the second permanent magnet 73 on one permanent magnet module are mutually attracted, while the first permanent magnet 72 and the second permanent magnet 73 on the other permanent magnet module maintain a state of maximum distance.

[0082] Meanwhile, this solution, by setting the circuit breaker's operating mechanism to include the aforementioned drive mechanism 7 and permanent magnet modules, reduces the size of the on / off control mechanism to only require permanent magnet modules on both sides of the electromagnetic coil 74. Its axial and radial volumes are relatively small. Without altering the installation foundation and ensuring compatibility with existing installation foundations and tools, it can replace the fuse element device on existing fuses, replacing passively protected fuses with actively protected circuit breakers. This solves the problems of needing on-site maintenance to restore the fuse element and the frequent replacement of the fuse element based on load changes. Furthermore, after replacing the existing fuse element device with this solution, since the protection provided to the power grid is active protection, if one of the three phases in the line trips due to a fault, the tripping information can be synchronized to the other two phases equipped with this solution based on the short-range wireless communication module or long-range communication module (such as a cellular mobile communication module) configured for the drive mechanism 7. The other two phases can then choose to operate or not operate based on their configuration and current operating conditions, achieving the function of simultaneous disconnection or closure of all three phases when necessary.

[0083] For the technical solution of configuring the drive mechanism 7 with a control module 8, the specific application is as follows: the sensor CT (detecting the current transformer 11) inputs the transformed current into the control module 8. The control module 8 converts the analog signal into a digital signal, then calculates the current value of the acquired signal. If the current value exceeds the set tripping current value, the remaining action time is calculated using an inverse time curve, and the situation is reported to the master station / upper level. After the remaining action time returns to zero, if there is no signal from the master station / upper level to maintain the closed state, the control module 8 controls the drive mechanism 7 to change the state of the conductive rod 10 from the closed state to the open state, and records and reports the action to the master station / upper level. It is easy to understand that this solution can also be used with other control strategies, such as immediately executing the tripping action if the current value exceeds the set tripping current value.

[0084] Example 4:

[0085] This embodiment is a further refinement of embodiment 1:

[0086] The flexible connection structure 12 includes a first connector 106, a flexible cable 107, a second connector 108, and an elastic element 105.

[0087] The flexible cable 107 is a flexible multi-strand cable or braided cable. One end of the flexible cable 107 is fixedly connected to the first connecting seat 106, and the other end of the flexible cable 107 is fixedly connected to the second connecting seat 108.

[0088] The flexible connection structure 12 on the first rod 101 is as follows: for the rod segments on the first rod 101 on both sides of the flexible connection structure 12, the first connecting seat 106 is fixedly connected to the rod segment on one side, the second connecting seat 108 is fixedly connected to the rod segment on the other side, and the elastic element 105 supports and fixes between the two rod segments.

[0089] The flexible connection structure 12 on the second rod 104 is as follows: the first connecting seat 106 is fixedly connected to the lower end of the second rod 104, the second connecting seat 108 is fixedly connected to the base 109, and the elastic element 105 is supported between the second rod 104 and the base 109.

[0090] The above solution provides a flexible connection structure 12 with good elasticity. Specifically, the flexible cable 107 and the elastic element 105 serve as the flexible and elastic parts of the flexible connection structure 12. The first connecting seat 106 and the second connecting seat 108 serve as the connecting seats for installation on the flexible connection structure 12. The first connecting seat 106 and the second connecting seat 108 can be made of metal rings with low resistivity, such as copper rings or silver-based alloy rings. When applied to the first pole 101, the first connecting seat 106 and the second connecting seat 108 can be fixed by welding to the corresponding pole segments. When applied to the second pole 104, the ends of the first connecting seat 106 and the second pole 104 are fixedly connected by welding, and the second connecting seat 108 is fixedly connected to the base 109 by welding. When applied to a circuit breaker, the base 109 is supported on the base plate 13. The flexible cable 107 adapts to the relative positions of the first connecting seat 106 and the second connecting seat 108 through flexible deformation, and the elastic element 105 adapts to the elastic deformation through elastic deformation. For the flexible connection structure 12 on the first rod 101, after this scheme is installed on the circuit breaker, the elastic element 105 is in a compressed deformation state. During the installation of this scheme on the circuit breaker, the elastic element 105 undergoes greater compression deformation to facilitate the installation of this scheme and protect the vacuum tube 102. For the flexible connection structure 12 on the second rod 104, after this scheme is installed on the circuit breaker, when the contact 110 is in the open or closed state, the elastic element 105 is in a compressed deformation state. The characteristic of this application is that the mechanism can be clamped by the contact plate 3 and the base plate 13 as described above, and the pull ring assembly 4 connected to the upper end of the outer shell 5 can be used to hook the pull ring hole on the pull ring assembly 4 to achieve manual opening.

[0091] If manual tripping is not considered, a better equivalent solution is: when the contact 110 is in the closed state, the elastic element 105 on the second rod 104 is in a free state or in a tensile deformation state that can maintain the contact quality between the base 109 and the base plate 13, preferably in a tensile deformation state, so as to reduce the impact of the closing action on the contact 110 and the vacuum tube 102 by storing energy.

[0092] Example 5:

[0093] This embodiment is a further refinement of embodiment 1:

[0094] The flexible connection structure 12 includes a first connecting seat 106, a stack 111, and a second connecting seat 108. The stack 111 includes multiple conductive sheets stacked in phase. The conductive sheets are metal sheets with arc-shaped bends. One end of the stack 111 is fixedly connected to the first connecting seat 106, and the other end of the stack 111 is fixedly connected to the second connecting seat 108.

[0095] The flexible connection structure 12 on the first rod 101 is as follows: for the rod segments on the first rod 101 on both sides of the flexible connection structure 12, the first connecting seat 106 is fixedly connected to the rod segment on one side, and the second connecting seat 108 is fixedly connected to the rod segment on the other side.

[0096] The flexible connection structure 12 on the second rod 104 is as follows: the first connecting seat 106 is fixedly connected to the lower end of the second rod 104, and the second connecting seat 108 is fixedly connected to the base 109.

[0097] Parallel to the above, the above scheme provides a flexible connection structure 12 with good elasticity. Specifically, the laminate 111 serves as both a flexible and elastic structure on the flexible connection structure 12. The first connecting seat 106 and the second connecting seat 108 serve as connecting seats on the flexible connection structure 12 for installation. The first connecting seat 106 and the second connecting seat 108 can be metal rings with low resistivity, such as copper rings or silver-based alloy rings. When applied to the first rod 101, the first connecting seat 106 and the second connecting seat 108 can be fixed by welding to the corresponding rod segment. When applied to the second rod 104, the ends of the first connecting seat 106 and the second rod 104 are fixedly connected by welding, and the second connecting seat 108 is fixedly connected to the base 109 by welding. When applied to a circuit breaker, the base 109 is supported on the base plate 13. Thus, the laminate 111, through elasticity... The deformation adapts to the relative positions of the first connecting seat 106 and the second connecting seat 108. For the flexible connecting structure 12 on the first rod 101, after this scheme is installed on the circuit breaker, the laminate 111 is in a state of compression deformation. During the installation of this scheme on the circuit breaker, the laminate 111 undergoes greater compression deformation to facilitate the installation of this scheme and protect the vacuum tube 102. For the flexible connecting structure 12 on the second rod 104, after this scheme is installed on the circuit breaker, if the use of the pull ring assembly 4 for manual tripping is not considered, preferably, when the contact 110 is in the tripping state, the laminate 111 is in a state of compression deformation, and when the contact 110 is in the closing state, the laminate 111 is in a free state or a tensile deformation state that can maintain the contact quality between the base 109 and the base plate 13. The tensile deformation state is preferred, so as to reduce the impact of the closing action on the contact 110 and the vacuum tube 102 by storing energy.

[0098] In the above two schemes, the ends of the flexible cable 107 and the stack 111 are welded to the first connector 106 and the second connector 108, or the ends of the flexible cable 107 and the stack 111 are encapsulated in the first connector 106 and the second connector 108. The elastic element 105 can be a helical spring, and the conductive sheet of the stack 111 can adopt an ellipsoidal thin shell structure. The arc bend on it can make it have stable elastic properties, deformation properties and the ability to maintain the position of the second rod 104 in its radial direction.

[0099] Example 6:

[0100] This embodiment is a further refinement of embodiment 2:

[0101] It also includes a control module 8 for controlling the drive mechanism 7, and a detection transformer 11 for sampling the current on the conductive rod 10, wherein the signal output terminal of the detection transformer 11 is connected to the signal input terminal of the control module 8.

[0102] The solution is as follows: Control module 8 collects the detection results of current transformer 11 and compares the detection results with the set current threshold. When it is determined that the current on the current conductive rod 10 is less than the set current threshold, the current contact state of contact 110 is maintained. When it is determined that the current on the current conductive rod 10 is greater than or equal to the set current threshold, the electromagnetic coil 74 drives the second rod 104 to move through the moving iron core 75, and the movement causes the contacts 110 to cooperate to form a circuit breaker isolation state. A preferred application is that control module 8 is equipped with a communication module to realize mutual communication between the on / off control mechanisms on different phases in the line, communication between the on / off control mechanism and the master station or superior, and communication between the on / off control mechanism and the handheld terminal of maintenance personnel. This communication can be used to transmit control signals of drive mechanism 7 so that drive mechanism 7 can perform opening and closing actions, and can also be used to transmit locally acquired data, circuit breaker configuration data, and other human-machine interaction data. As someone skilled in the art, this control logic does not need to involve improvements to the computer program based on the existing technology.

[0103] Example 7:

[0104] This embodiment is a further refinement of embodiment 2:

[0105] It also includes a power supply module for providing electrical energy to the drive mechanism 7. The power supply module includes an energy harvesting transformer 9 that cooperates with the conductive rod 10, and a storage battery that is electrically connected to the energy harvesting transformer 9. The energy harvesting transformer 9 is an energy harvesting element that is based on electromagnetic induction and draws power from the magnetic field of the conductive rod 10. The storage battery is used to store the electrical energy collected by the energy harvesting transformer 9 and to supply power to the electromagnetic coil 74.

[0106] This solution is used to provide power supply for the on / off control mechanism under the usage scenario. The power transformer 9 is used to draw power from the line used by the on / off control mechanism, and the battery is used to store the obtained power to provide a stable and reliable power supply for the control module 8 and the drive mechanism 7.

[0107] Example 8:

[0108] This embodiment is a further refinement of embodiment 3:

[0109] Each permanent magnet module is equipped with a flexible pad 76. For any permanent magnet module, when the first permanent magnet 72 and the second permanent magnet 73 attract each other, the flexible pad 76 acts as an elastic pad between the first permanent magnet 72 and the second permanent magnet 73 and undergoes compressive elastic deformation.

[0110] In this scheme, during the operation of the drive mechanism 7, the flexible pad 76 isolates rigid impacts, so that the first permanent magnet 72 and the second permanent magnet 73 have a small gap when they attract each other, so as to maintain sufficient magnetic force to keep the position of the second rod 104. That is, the flexible pad 76 provides flexible impact protection for the permanent magnet module or other components in this scheme by undergoing compressive elastic deformation. During the closing process, a specific amount of compressive elastic deformation occurs according to the displacement of the second rod 104, so that the contact 110 has reliable contact quality when the first permanent magnet 72 and the second permanent magnet 73 attract each other.

[0111] Example 9:

[0112] This embodiment is a further refinement of embodiment 1:

[0113] It also includes a pull ring assembly 4 connected to the upper end of the housing 5, the pull ring assembly 4 having a pull ring hole for a hook to be hooked onto the pull ring assembly 4. This solution aims to achieve a tripping operation in case of a failure of the drive mechanism 7, specifically by using an operating rod such as an insulating rod with a hook at the top to pull the pull ring assembly 4 to remove the series connection of this mechanism in the circuit.

[0114] Example 10:

[0115] Based on Embodiment 1, this embodiment provides an intelligent circuit breaker, including a fixed base 1, a top plate 2 connected to the upper end of the fixed base 1, and a bottom plate 13 connected to the lower end of the fixed base 1. The top plate 2 is provided with a contact plate 3 elastically supported on the top plate 2, and also includes the on / off control mechanism described in Embodiment 1.

[0116] The outer shell 5 is supported between the base plate 13 and the contact plate 3: the lower end of the outer shell 5 is supported on the base plate 13, the upper end of the first rod 101 is supported on the contact plate 3, the second rod 104 is electrically connected to the base plate 13, and the flexible connection structure 12 on the first rod 101 is in an elastic compression state.

[0117] As is easily understood, this solution is a specific application of the on / off control mechanism in a circuit breaker, that is, providing a circuit breaker including the on / off control mechanism. Preferably, the outer surface of the housing 5 is provided with a plurality of flanges 6 distributed at different axial positions of the housing 5. The flanges 6 are annular protrusions on the outer surface of the housing 5, used to increase the creepage distance on the outside of the housing 5.

[0118] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, other embodiments derived without departing from the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart circuit breaker on / off control mechanism, comprising a housing (5), a vacuum tube (102) fixed in the housing (5), and a conductive rod (10) connected to the vacuum tube (102), wherein the conductive rod (10) comprises a first rod body (101) and a second rod body (104) arranged opposite each other, each of the first rod body (101) and the second rod body (104) being provided with a contact (110) that cooperates with the other, and each being connected to the vacuum tube (102), wherein the contact (110) is located in the vacuum tube (102), characterized in that, Both the first rod (101) and the second rod (104) are connected to a flexible connection structure (12) located outside the vacuum tube (102). The flexible connection structure (12) on the first rod (101) serves as a conductive structure and can generate elastic deformation in the length direction of the conductive rod (10). The upper end of the first rod (101) extends to the outside of the upper end of the outer shell (5), and the flexible connection structure (12) on the first rod (101) is connected in series on the first rod (101).

2. The intelligent circuit breaker on / off control mechanism according to claim 1, characterized in that, It also includes a drive mechanism (7) for changing the engagement state of the contact (110), the drive mechanism (7) being an electromagnetic driver including a housing (71), a moving iron core (75) and an electromagnetic coil (74); The housing (71) is fixed in the outer shell (5), the moving iron core (75) is fixed on the second rod (104), and the electromagnetic coil (74) is fixed on the housing (71).

3. The intelligent circuit breaker on / off control mechanism according to claim 2, characterized in that, Both ends of the electromagnetic coil (74) are equipped with permanent magnet modules, and each permanent magnet module includes a first permanent magnet (72) and a second permanent magnet (73); Any permanent magnet module consists of: a first permanent magnet (72) fixed on the housing (71), and a second permanent magnet (73) fixed on the second rod (104); When the first permanent magnet (72) and the second permanent magnet (73) on the permanent magnet module at one end of the electromagnetic coil (74) attract each other, the first permanent magnet (72) and the second permanent magnet (73) on the permanent magnet module at the other end of the electromagnetic coil (74) remain in a state of maximum distance away. When the first permanent magnet (72) and the second permanent magnet (73) on the permanent magnet module close to the first rod (101) attract each other, the contacts (110) cooperate to form a closed contact state; when the first permanent magnet (72) and the second permanent magnet (73) on the permanent magnet module away from the first rod (101) attract each other, the contacts (110) cooperate to form a closed isolation state.

4. The intelligent circuit breaker on / off control mechanism according to claim 1, characterized in that, The flexible connection structure (12) includes a first connector (106), a flexible cable (107), a second connector (108), and an elastic element (105); The flexible cable (107) is a flexible multi-strand cable or braided cable. One end of the flexible cable (107) is fixedly connected to the first connector (106), and the other end of the flexible cable (107) is fixedly connected to the second connector (108). The flexible connection structure (12) on the first rod (101) is as follows: for the rod segments on the first rod (101) on both sides of the flexible connection structure (12), the first connecting seat (106) is fixedly connected to one of the rod segments, the second connecting seat (108) is fixedly connected to the other rod segment, and the elastic element (105) is supported and fixed between the two rod segments. The flexible connection structure (12) on the second rod (104) is as follows: the first connecting seat (106) is fixedly connected to the lower end of the second rod (104), the second connecting seat (108) is fixedly connected to the base (109), and the elastic element (105) is supported between the second rod (104) and the base (109).

5. The intelligent circuit breaker on / off control mechanism according to claim 1, characterized in that, The flexible connection structure (12) includes a first connector (106), a stack (111), and a second connector (108). The stack (111) includes multiple conductive sheets stacked in phase. The conductive sheets are metal sheets with arc-shaped bends. One end of the stack (111) is fixedly connected to the first connector (106), and the other end of the stack (111) is fixedly connected to the second connector (108). The flexible connection structure (12) on the first rod (101) is as follows: for the rod segments on the first rod (101) on both sides of the flexible connection structure (12), the first connecting seat (106) is fixedly connected to the rod segment on one side, and the second connecting seat (108) is fixedly connected to the rod segment on the other side. The flexible connection structure (12) on the second rod (104) is as follows: the first connecting seat (106) is fixedly connected to the lower end of the second rod (104), and the second connecting seat (108) is fixedly connected to the base (109).

6. The intelligent circuit breaker on / off control mechanism according to claim 2, characterized in that, It also includes a control module (8) for controlling the drive mechanism (7), and a detection transformer (11) for sampling the current on the conductive rod (10), wherein the signal output terminal of the detection transformer (11) is connected to the signal input terminal of the control module (8).

7. The intelligent circuit breaker on / off control mechanism according to claim 2, characterized in that, It also includes a power supply module for providing electrical energy to the drive mechanism (7), the power supply module including an energy harvesting transformer (9) that cooperates with the conductive rod (10), and a storage battery that is electrically connected to the energy harvesting transformer (9). The energy harvesting transformer (9) is an energy harvesting element that is based on electromagnetic induction and is powered by the magnetic field of the conductive rod (10). The storage battery is used to store the electrical energy collected by the energy harvesting transformer (9) and to power the electromagnetic coil (74).

8. The intelligent circuit breaker on / off control mechanism according to claim 3, characterized in that, Each permanent magnet module is equipped with a flexible pad (76). For any permanent magnet module, when the first permanent magnet (72) and the second permanent magnet (73) attract each other, the flexible pad (76) serves as an elastic pad between the first permanent magnet (72) and the second permanent magnet (73) and undergoes compressive elastic deformation.

9. The intelligent circuit breaker on / off control mechanism according to claim 1, characterized in that, It also includes a pull ring assembly (4) connected to the upper end of the outer casing (5), the pull ring assembly (4) having a pull ring hole for the pull hook to be hooked on the pull ring assembly (4).

10. A smart circuit breaker, comprising a fixed base (1), a top plate (2) connected to the upper end of the fixed base (1), and a bottom plate (13) connected to the lower end of the fixed base (1), wherein a contact plate (3) elastically supported on the top plate (2) is disposed thereon, characterized in that, It also includes the on / off control mechanism as described in any one of claims 1 to 9; The outer shell (5) is supported between the base plate (13) and the contact plate (3): the lower end of the outer shell (5) is supported on the base plate (13), the upper end of the first rod (101) is supported on the contact plate (3), the second rod (104) is electrically connected to the base plate (13), and the flexible connection structure (12) on the first rod (101) is in an elastic compression state.

Images