Electromagnetic power-assisted compression device, control method thereof, control device, storage medium and sulfur hexafluoride circuit breaker

Abstract

The invention relates to an electromagnetic power-assisted compression device, a control method thereof, a control device, a storage medium and a sulfur hexafluoride circuit breaker. The device includes a retractable piston assembly and a manipulation assembly. The telescopic piston assembly is arranged in an air cylinder in the sulfur hexafluoride circuit breaker, and the telescopic piston assembly is used for compressing sulfur hexafluoride gas in the air cylinder; the control assembly is in transmission connection and electric connection with the telescopic piston assembly, and the control assembly is used for driving the telescopic piston assembly to compress the sulfur hexafluoride gas in the gas cylinder under the condition that fault current is monitored to flow through the sulfur hexafluoride circuit breaker, and driving the telescopic piston assembly to compress the sulfur hexafluoride gas in the gas cylinder under the condition that the fault current is greater than or equal to a preset current threshold value. And the telescopic piston assembly is driven to be in a stretching state so as to accelerate the compression of sulfur hexafluoride gas in the compression cylinder. The device can provide enough air blowing pressure to realize arc extinguishing.

Description

Technical Field

[0001] This application relates to the field of high-voltage circuit breaker technology, and in particular to an electromagnetic booster compression device and its control method, control device, storage medium and sulfur hexafluoride circuit breaker. Background Technology

[0002] In power systems, the core functions of high-voltage circuit breakers at 126kV and above are to interrupt normal operating current and clear fault current. Sulfur hexafluoride (SF6) gas is the preferred medium for this type of circuit breaker due to its excellent insulation and arc-extinguishing properties. Among them, compressed-air SF6 circuit breakers are widely used due to their simple structure and high reliability. Their arc-extinguishing system uses an operating mechanism to drive the moving contact and piston to move synchronously, compressing SF6 to form a high-pressure airflow, which blows away the arc generated by contact separation to extinguish it.

[0003] However, this purely mechanical air-compressing structure has limitations. The establishment of air-blowing pressure depends on the piston displacement-velocity curve. When interrupting extremely large short-circuit currents, the arc energy and cooling demand reach their maximum at the current peak moment. At this time, the piston is often not yet at the pressure peak position, resulting in a "pressure-current peak time mismatch," which easily leads to interruption failure. Existing solutions that increase pressure by increasing operating work and optimizing the air path are approaching the physical and material limits, with little room for improvement and high costs. Summary of the Invention

[0004] Therefore, it is necessary to provide an electromagnetically assisted compression device and its control method, control device, storage medium, and sulfur hexafluoride circuit breaker to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides an electromagnetically assisted compression device applied to a sulfur hexafluoride circuit breaker, the device comprising:

[0006] A retractable piston assembly is installed in the compressor cylinder inside the sulfur hexafluoride circuit breaker. The retractable piston assembly is used to compress the sulfur hexafluoride gas in the compressor cylinder.

[0007] The control component is connected to the retractable piston assembly via both transmission and electrical means. The control component is used to drive the retractable piston assembly to compress the sulfur hexafluoride gas in the cylinder when a fault current is detected flowing through the sulfur hexafluoride circuit breaker, and to drive the retractable piston assembly to extend in order to accelerate the compression of the sulfur hexafluoride gas in the cylinder when the fault current is greater than or equal to a preset current threshold.

[0008] In one embodiment, the retractable piston assembly includes:

[0009] Metal piston head;

[0010] The first piston rod is connected to the control component in a transmission manner, and the first piston rod has a accommodating space inside;

[0011] The second piston rod has one end mechanically connected to the metal piston head, and the other end of the second piston rod is slidably inserted into the receiving space.

[0012] A locking structure is provided within the accommodating space and is used to lock the relative movement distance of the second piston rod relative to the first piston rod.

[0013] An electromagnetic coil is wound around the outer periphery of the first piston rod and is electrically connected to the control component. The electromagnetic coil is used to generate an electromagnetic repulsive force under the power supply of the control component to push the metal piston head to drive the second piston rod to move relative to the first piston rod.

[0014] In one embodiment, the second piston rod further includes a limiting groove, and the accommodating space includes a first accommodating cavity and a second accommodating cavity that are connected and perpendicular to each other. The first accommodating cavity is used to accommodate the second piston rod, and the locking structure includes:

[0015] A spring is disposed in the second accommodating cavity, and one end of the spring is fixedly connected to the inner wall of the first piston rod.

[0016] The ball bearing is fixedly connected to the other end of the spring.

[0017] During the movement of the second piston rod relative to the first piston rod, the spring pushes the ball outward to the limiting groove.

[0018] In one embodiment, the control component includes:

[0019] A transmission assembly, which is connected to the retractable piston assembly in a transmission manner;

[0020] A current sensor is connected in series in the circuit between the high-voltage line and the sulfur hexafluoride circuit breaker. The current sensor is used to monitor the current flowing through the sulfur hexafluoride circuit breaker.

[0021] The controller is electrically connected to the transmission assembly, the current sensor, and the retractable piston assembly. The controller is used to acquire the current flowing through the sulfur hexafluoride circuit breaker, and when a fault current is detected, it drives the transmission assembly to drive the retractable piston assembly to compress the sulfur hexafluoride gas in the cylinder. When the fault current is detected to be greater than or equal to a preset current threshold, it drives the retractable piston assembly to extend to accelerate the compression of the sulfur hexafluoride gas in the cylinder.

[0022] In one embodiment, where the retractable piston assembly includes a metal piston head, a first piston rod, a second piston rod, a locking structure, and an electromagnetic coil, the control assembly further includes:

[0023] An energy storage component is electrically connected to both the controller and the electromagnetic coil.

[0024] The controller is used to control the energy storage component to supply power to the electromagnetic coil when the fault current is determined to be greater than or equal to a preset current threshold.

[0025] Secondly, this application provides an electromagnetic-assisted compression control method, applied to the electromagnetic-assisted compression device in the above embodiments, the method comprising:

[0026] Collect the current flowing through the sulfur hexafluoride circuit breaker;

[0027] If a fault current is detected flowing through the sulfur hexafluoride circuit breaker, the retractable piston assembly is driven to compress the sulfur hexafluoride gas in the cylinder.

[0028] When the fault current is determined to be greater than or equal to a preset current threshold, the retractable piston assembly is driven into an extended state to accelerate the compression of sulfur hexafluoride gas in the cylinder.

[0029] In one embodiment, when a fault current is determined to be greater than or equal to a preset current threshold, the retractable piston assembly is driven into an extended state to accelerate the compression of sulfur hexafluoride gas in the cylinder, including:

[0030] If the fault current is determined to be greater than or equal to a preset current threshold, the current rise rate is determined based on the fault current.

[0031] Obtain the transmission parameters of the control components and the contact opening distance parameters of the sulfur hexafluoride circuit breaker;

[0032] The target driving moment is determined based on the transmission parameters, contact gap parameters, and current rise rate; the target driving moment is a moment before the current peak is reached or before the current crosses zero.

[0033] At the target driving moment, the retractable piston assembly is driven into the extended state.

[0034] Thirdly, this application provides an electromagnetic assist compression control device, applied to the electromagnetic assist compression device in the above embodiments, the electromagnetic assist compression control device comprising:

[0035] The data acquisition module is used to collect the current flowing through the sulfur hexafluoride circuit breaker;

[0036] The first drive module is used to drive the retractable piston assembly to compress the sulfur hexafluoride gas in the cylinder when it is determined that a fault current is flowing through the sulfur hexafluoride circuit breaker.

[0037] The second drive module is used to drive the retractable piston assembly into an extended state when the fault current is determined to be greater than or equal to a preset current threshold, so as to accelerate the compression of sulfur hexafluoride gas in the cylinder.

[0038] Fourthly, this application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0039] Fifthly, this application provides a sulfur hexafluoride circuit breaker, which includes:

[0040] Sulfur hexafluoride circuit breaker body;

[0041] And the electromagnetic-assisted compression device in the above embodiments.

[0042] The aforementioned electromagnetic-assisted compression device, its control method, control device, storage medium, and sulfur hexafluoride circuit breaker have at least the following beneficial effects:

[0043] Through the coordinated operation of the retractable piston assembly and the control assembly, when the fault current does not exceed the preset threshold, the retractable piston assembly, in its normal state, works with the control assembly to complete gas compression, avoiding additional energy consumption and mechanical losses. When the fault current reaches or exceeds the preset threshold, the control assembly can drive the retractable piston assembly to quickly switch to the extended state. By increasing the piston compression stroke and instantly increasing the movement speed, the pressure of sulfur hexafluoride gas in the compressed cylinder is pushed to a higher level in a very short time, forming enhanced gas blowing. This effectively solves the problem of pressure peak and current peak time mismatch when traditional compressed air circuit breakers interrupt large currents, significantly improving the circuit breaker's ultimate breaking capacity and reliability for large current faults. Secondly, this device does not require excessively increasing the energy consumption and size of the original main operating mechanism of the high-voltage circuit breaker. It achieves enhanced gas blowing only through the retractable structure and timing control. While ensuring the arc extinguishing effect, it helps to control the overall cost and volume of the circuit breaker, balancing performance improvement and practicality, and adapting to the power system's requirements for high reliability and low loss operation of high-voltage circuit breakers. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of an electromagnetically assisted compression device in one embodiment;

[0046] Figure 2 This is a schematic diagram of the retractable piston assembly in the electromagnetically assisted compression device in one embodiment when it is in the extended state.

[0047] Figure 3 This is a flowchart illustrating an electromagnetic-assisted compression control method in one embodiment;

[0048] Figure 4 This is a flowchart illustrating the step of driving the retractable piston assembly into an extended state to accelerate the compression of sulfur hexafluoride gas in the cylinder when the fault current is determined to be greater than or equal to a preset current threshold, in another embodiment.

[0049] Figure 5 This is a structural block diagram of an electromagnetic-assisted compression control device in one embodiment. Detailed Implementation

[0050] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0052] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0053] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0054] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0055] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0056] In one exemplary embodiment, such as Figure 1 As shown, this application provides an electromagnetically assisted compression device applied to a sulfur hexafluoride (SF6) circuit breaker. The device includes a retractable piston assembly 2 and a control assembly 4. The retractable piston assembly 2 is disposed within a compression cylinder 300 inside the SF6 circuit breaker and is used to compress the SF6 gas in the compression cylinder 300. The control assembly 4 is connected to the retractable piston assembly 2 via both transmission and electrical connections. The control assembly 4 is used to drive the retractable piston assembly 2 to compress the SF6 gas in the compression cylinder 300 when a fault current is detected flowing through the SF6 circuit breaker, and to drive the retractable piston assembly 2 into an extended state when the fault current is greater than or equal to a preset current threshold, thereby accelerating the compression of the SF6 gas in the compression cylinder 300.

[0057] The retractable piston assembly 2 is a component used within the sulfur hexafluoride (SF6) circuit breaker's compression cylinder 300 to compress the SF6 gas within it. It can also be extended under the drive of the control assembly 4 to accelerate gas compression. Specifically, it allows for retraction to adjust the compression stroke, adapting to gas compression requirements under different fault current scenarios. When the fault current does not exceed a threshold, compression is completed in normal mode in conjunction with the control assembly 4. When the fault current reaches the threshold, extension increases the compression stroke and speed, enhancing the air blowing effect. The control assembly 4 is a control and drive component that establishes a transmission and electrical connection with the retractable piston assembly 2. On one hand, it can monitor the current flowing through the SF6 circuit breaker in real time to determine if a fault current exists. On the other hand, it can drive the retractable piston assembly 2 based on the current monitoring results. When a fault current is detected, it drives the retractable piston assembly 2 to compress the SF6 gas. When the fault current is greater than or equal to a preset current threshold, it further drives the retractable piston assembly 2 to the extended state, thereby accelerating gas compression and ensuring sufficient air blowing pressure for arc extinguishing under high current scenarios.

[0058] For example, when the sulfur hexafluoride circuit breaker needs to disconnect the circuit, the control component 4 monitors the current flowing through the circuit breaker in real time to determine whether a fault current exists. If a fault current is detected, the control component 4 first drives the retractable piston assembly 2 to start compressing sulfur hexafluoride gas in the compression cylinder 300 via a transmission connection, initiating the normal gas compression process; simultaneously, the control component 4 continuously judges the magnitude of the fault current. If it is determined that the fault current is greater than or equal to a preset current threshold (i.e., the condition requiring enhanced gas blowing), it sends an extension drive signal to the retractable piston assembly 2 via an electrical connection. After receiving the signal, the retractable piston assembly 2 immediately switches to the extended state (e.g., ...). Figure 2 As shown in the diagram, its telescopic structure unfolds under the drive of the control component 4, further increasing the overall piston stroke and instantly boosting the piston's speed within the compression cylinder 300. The increased piston stroke allows for greater compression of the sulfur hexafluoride gas within the compression cylinder 300, while the increased speed significantly shortens the gas compression time. Together, these factors enable rapid and deep compression of the sulfur hexafluoride gas within the compression cylinder 300, causing the gas pressure to quickly rise to a higher level, resulting in an enhanced gas blow that far exceeds conventional compression modes. This enhanced gas blow acts directionally on the arc generated by the separation of the moving and stationary contacts through the nozzle. With higher pressure and flow rate, it efficiently cools the arc plasma, suppresses arc expansion, and rapidly restores arc gap insulation at the instant the current naturally crosses zero, providing sufficient gas blow pressure to ensure successful arc extinguishing and meeting the interruption requirements under high-current fault conditions.

[0059] The aforementioned electromagnetic-assisted compression device, through the coordinated operation of the retractable piston assembly 2 and the control assembly 4, allows the retractable piston assembly 2 to perform gas compression in its normal state in conjunction with the control assembly 4 when the fault current does not exceed the preset threshold, avoiding additional energy consumption and mechanical losses. When the fault current reaches or exceeds the preset threshold, the control assembly 4 can drive the retractable piston assembly 2 to quickly switch to the extended state. By increasing the piston compression stroke and instantly increasing the movement speed, the pressure of sulfur hexafluoride gas in the compression cylinder 300 is pushed to a higher level in a very short time, forming enhanced air blowing. This effectively solves the problem of mismatch between the pressure peak and current peak time when traditional compressed air circuit breakers interrupt large currents, significantly improving the circuit breaker's ultimate breaking capacity and reliability for large current faults. Secondly, this device does not require excessively increasing the energy consumption and size of the original main operating mechanism of the high-voltage circuit breaker. It achieves enhanced air blowing only through the retractable structure and timing control. While ensuring the arc extinguishing effect, it helps control the overall cost and volume of the circuit breaker, balancing performance improvement and practicality, and adapting to the power system's requirements for high reliability and low loss operation of high-voltage circuit breakers.

[0060] In one exemplary embodiment, such as Figure 2As shown, the retractable piston assembly 2 includes: a metal piston head 20, a first piston rod 22, a second piston rod 24, a locking structure 26, and an electromagnetic coil 28. The first piston rod 22 is drive-connected to the control component 4 and has an accommodating space. One end of the second piston rod 24 is mechanically connected to the metal piston head 20, and the other end of the second piston rod 24 is slidably inserted into the accommodating space. The locking structure 26 is disposed within the accommodating space and is used to lock the relative movement distance of the second piston rod 24 relative to the first piston rod 22. The electromagnetic coil 28 is wound around the outer periphery of the first piston rod 22 and is electrically connected to the control component 4. Under the power supply of the control component 4, the electromagnetic coil 28 generates an electromagnetic repulsive force to push the metal piston head 20 to move the second piston rod 24 relative to the first piston rod 22.

[0061] The metal piston head 20 can be made of a lightweight material with good electrical conductivity and non-ferromagnetic properties, such as aluminum alloy or its composite material.

[0062] For example, when the sulfur hexafluoride circuit breaker needs to disconnect the circuit and the control component 4 detects a fault current and determines that the fault current is greater than or equal to a preset current threshold, the control component 4, on the one hand, drives the first piston rod 22 connected to itself to move through a transmission connection, causing the entire telescopic piston assembly 2 to compress sulfur hexafluoride gas within the compression cylinder 300; on the other hand, the control component 4 supplies power to the electromagnetic coil 28 wound around the outer periphery of the first piston rod 22 through an electrical connection. The electromagnetic coil 28 generates a strong magnetic field under the power supply, and this magnetic field interacts with the metal piston head 20 to form an electromagnetic repulsion force. This repulsion force is in the same direction as the piston compression direction, thereby pushing the metal piston head 20 to move. Since the metal piston head 20 is mechanically connected to the second piston rod 24, and the other end of the second piston rod 24 slides into the receiving space of the first piston rod 22, the metal piston head 20 will drive the second piston rod 24 to move rapidly relative to the first piston rod 22, causing the second piston rod 24 to extend out of the receiving space of the first piston rod 22, instantly increasing the overall stroke of the telescopic piston assembly 2. Simultaneously, the instantaneous driving force generated by electromagnetic repulsion significantly increases the movement speed of the metal piston head 20 and the second piston rod 24, thus significantly improving the compression speed of the retractable piston assembly 2. Under the combined effect of increased stroke and increased speed, the retractable piston assembly 2 achieves a greater compression amplitude and higher compression efficiency for the sulfur hexafluoride gas in the compression cylinder 300, enabling the gas pressure within the compression cylinder 300 to rapidly rise to a higher level in a very short time, forming an enhanced air blow. During this period, the locking structure 26 within the accommodating space locks the relative movement distance of the second piston rod 24 relative to the first piston rod 22, ensuring that the retractable piston assembly 2 maintains its increased stroke to continuously compress the gas. This enhanced air blow acts on the arc generated by the separation of the moving and stationary contacts through the nozzle, cooling the arc and restoring arc gap insulation with high pressure and high flow rate, thus providing sufficient air blow pressure to extinguish the arc.

[0063] In this embodiment, when the fault current reaches or exceeds a preset threshold, the control component 4 can simultaneously drive the first piston rod 22 to compress the gas as a whole and supply power to the electromagnetic coil 28. The electromagnetic repulsion generated by the electromagnetic coil 28 can quickly push the metal piston head 20 and the second piston rod 24 to move relative to the first piston rod 22. This increases the compression stroke by extending the second piston rod 24 momentarily and increases the compression speed with the help of the instantaneous repulsion. The combined effect of these two factors can push the sulfur hexafluoride gas pressure in the compressor cylinder 300 to a higher level in a very short time, forming an enhanced gas blowing effect. This effectively solves the problem of mismatch between the peak pressure and peak current time in traditional compressor mechanisms and ensures the arc extinguishing effect under high current conditions. At the same time, the locking structure 26 in the accommodating space can lock the relative movement distance of the second piston rod 24 to ensure that the increased stroke is maintained stably and to prevent structural loosening during compression from affecting the gas blowing pressure.

[0064] In one exemplary embodiment, such as Figure 2 As shown, the second piston rod 24 also includes a limiting groove 240. The accommodating space includes a first accommodating cavity and a second accommodating cavity that are connected and perpendicular to each other. The first accommodating cavity is used to accommodate the second piston rod 24. The locking structure 26 includes a spring 262 and a ball 260. The spring 262 is disposed in the second accommodating cavity, and one end of the spring 262 is fixedly connected to the inner sidewall of the first piston rod 22. The ball 260 is fixedly connected to the other end of the spring 262. During the movement of the second piston rod 24 relative to the first piston rod 22, the spring 262 pushes the ball 260 outward to the limiting groove 240.

[0065] Exemplarily, the accommodating space includes a first accommodating cavity and a second accommodating cavity that are connected and perpendicular to each other. The first accommodating cavity is used to accommodate the second piston rod 24, allowing the second piston rod 24 to slide relative to the first piston rod 22 along the extending direction of the first accommodating cavity. The second accommodating cavity provides installation space for the locking structure 26. A spring 262 is disposed in the second accommodating cavity, with one end of the spring 262 fixedly connected to the inner wall of the first piston rod 22, and a ball bearing 260 fixedly connected to the other end of the spring 262. In the initial state, the spring 262 is in a naturally extended or slightly compressed state, and the ball bearing 260, supported by the spring 262, partially extends into the first accommodating cavity, preparing for subsequent locking actions. When the control component 4 drives the electromagnetic coil 28 to generate electromagnetic repulsion, pushing the metal piston head 20 to move the second piston rod 24 relative to the first piston rod 22, the second piston rod 24 slides along the inside of the first accommodating cavity, and its outer wall continuously contacts the ball bearing 260. As the second piston rod 24 extends out of the first accommodating cavity, when the limiting groove 240 on the second piston rod 24 moves to align with the opening of the second accommodating cavity, the spring 262, which was originally compressed by the outer wall of the second piston rod 24, will push the ball 260 outward under its own elastic restoring force, causing the ball 260 to move away from the second accommodating cavity and embed into the limiting groove 240 of the second piston rod 24. At this time, under the combined action of the circumferential constraint of the limiting groove 240 and the axial thrust of the spring 262, the ball 260 cannot disengage from the limiting groove 240, thus restricting the second piston rod 24 from continuing to move along the sliding direction of the first accommodating cavity and preventing the second piston rod 24 from retracting into the first accommodating cavity. This ultimately locks the position of the second piston rod 24 relative to the first piston rod 22, ensuring that the retractable piston assembly 2 maintains its current overall stroke and stably completes the subsequent sulfur hexafluoride gas compression and arc extinguishing operations.

[0066] In this embodiment, locking is achieved through the mechanical cooperation of the elastic force of the spring 262, the ball 260, and the limiting groove 240. This eliminates the need for complex electronic control components, reducing the risk of failure and manufacturing costs. Furthermore, it fits the compact spatial layout of the retractable piston assembly 2 without increasing the overall volume. The locking action is automatically synchronized; when the second piston rod 24 moves relative to the first piston rod 22 to a preset stroke (the limiting groove 240 aligns with the second receiving cavity), the spring 262 automatically pushes the ball 260 into the limiting groove 240 using its own elastic restoring force, requiring no additional control commands and achieving precise matching. The extension rhythm of the second piston rod 24, driven by electromagnetic assistance, ensures rapid locking after a momentary increase in stroke. In addition, after the ball bearing 260 is embedded in the limiting groove 240, the circumferential constraint of the limiting groove 240 and the axial thrust of the spring 262 work together to prevent the second piston rod 24 from extending further and to prevent it from retracting. This keeps the telescopic piston assembly 2 with a stable overall stroke, avoids pressure fluctuations of sulfur hexafluoride gas due to structural loosening during compression, ensures the pressure stability and reliability of subsequent gas-blown arc extinguishing, and thus improves the arc extinguishing success rate when the circuit breaker interrupts a high-current fault.

[0067] In an exemplary embodiment, the control component 4 includes a transmission component, a current sensor, and a controller. The transmission component is drive-connected to the retractable piston assembly 2; the current sensor is connected in series in the circuit between the high-voltage line and the sulfur hexafluoride circuit breaker, and is used to monitor the current flowing through the sulfur hexafluoride circuit breaker; the controller is electrically connected to the transmission component, the current sensor, and the retractable piston assembly 2, respectively, and is used to acquire the current flowing through the sulfur hexafluoride circuit breaker, and, if a fault current is determined to exist, drive the transmission component to drive the retractable piston assembly 2 to compress the sulfur hexafluoride gas in the compression cylinder 300, and, if a fault current is determined to be greater than or equal to a preset current threshold, drive the retractable piston assembly 2 to extend to accelerate the compression of the sulfur hexafluoride gas in the compression cylinder 300.

[0068] For example, a current sensor is connected in series in the circuit between the high-voltage line and the sulfur hexafluoride (SF6) circuit breaker to continuously monitor the current flowing through the SF6 circuit breaker and transmit the monitored current signal to the controller in real time. After receiving the current signal, the controller analyzes it. If a fault current is detected, it immediately drives the transmission component electrically connected to it. Since the transmission component is connected to the retractable piston assembly 2, it drives the retractable piston assembly 2 to begin compressing SF6 gas within the compression cylinder 300, initiating the basic compression process. Simultaneously, the controller continuously judges the magnitude of the fault current. If the fault current is determined to be greater than or equal to a preset current threshold, it further sends a drive signal to the retractable piston assembly 2, causing it to switch to the extended state. Under the action of this drive signal, the retractable piston assembly 2 expands its structure to increase the overall compression stroke. The extension action, combined with the continuous driving force of the transmission component, instantly increases the movement speed of the retractable piston assembly 2 within the compression cylinder 300. The increased stroke significantly amplifies the compression amplitude of the sulfur hexafluoride gas within the compression cylinder 300 by the retractable piston assembly 2, while the increased speed drastically shortens the gas compression time. Under the combined effect of these two factors, the sulfur hexafluoride gas within the compression cylinder 300 is rapidly and deeply compressed in a very short time, causing the gas pressure to quickly rise to a higher level, thus forming an enhanced air blow. This enhanced air blow acts on the arc generated by the separation of the moving and stationary contacts, efficiently cooling the arc and restoring the arc gap insulation through high pressure and high flow rate, thereby providing sufficient air blow pressure to extinguish the arc.

[0069] In this embodiment, a current sensor is connected in series in the circuit between the high-voltage line and the circuit breaker. It can monitor the current flowing through the circuit breaker in real time, providing accurate current data support for the controller. This ensures that the controller can quickly identify fault currents and avoid untimely arc extinguishing due to delayed current monitoring. Based on the accurate judgment of the current signal, the controller drives the transmission component to drive the retractable piston assembly 2 to start basic compressed air when a fault current exists. When the fault current reaches a preset threshold, the retractable piston assembly 2 is further driven to extend, realizing on-demand enhanced compressed air control and avoiding unnecessary energy consumption and mechanical damage. Moreover, the transmission connection between the transmission component and the retractable piston assembly 2 ensures the stable execution of basic compressed air. The extended state of the retractable piston assembly 2 can increase the compression speed by increasing the compression stroke and superimposing the driving force of the transmission component. The combination of the two can push the sulfur hexafluoride gas pressure in the compressor cylinder 300 to a higher level in a very short time, forming enhanced air blowing. This effectively solves the problem of mismatch between the pressure peak and current peak time in traditional compressed air mechanisms, ensuring sufficient pressure for arc extinguishing.

[0070] In an exemplary embodiment, where the retractable piston assembly 2 includes a metal piston head 20, a first piston rod 22, a second piston rod 24, a locking structure 26, and an electromagnetic coil 28, the control assembly 4 further includes an energy storage assembly. The energy storage assembly is electrically connected to both the controller and the electromagnetic coil 28; wherein the controller is configured to control the energy storage assembly to supply power to the electromagnetic coil 28 when it is determined that the fault current is greater than or equal to a preset current threshold.

[0071] For example, the energy storage component (such as a capacitor) pre-stores energy and is always in a standby state. It maintains electrical connections with the controller and the electromagnetic coil 28, respectively, thus establishing a circuit path for subsequent power supply to the electromagnetic coil 28. When the sulfur hexafluoride circuit breaker needs to disconnect the circuit, the current sensor connected in series between the high-voltage line and the sulfur hexafluoride circuit breaker monitors the current flowing through the circuit breaker in real time and continuously transmits the monitored current signal to the controller. After receiving the current signal, the controller analyzes and judges the current data. First, it identifies whether there is a fault current. If a fault current is determined, it first drives the transmission component to drive the retractable piston assembly 2 to compress the sulfur hexafluoride gas. At the same time, the controller continues to determine the magnitude of the fault current. When it is determined that the fault current is greater than or equal to a preset current threshold, it sends a power supply control signal to the energy storage component. After receiving the power supply control signal from the controller, the energy storage component, through the electrical connection between itself and the electromagnetic coil 28, transmits the pre-stored energy in the form of electrical energy to the electromagnetic coil 28 wound around the outer periphery of the first piston rod 22. During this process, the controller precisely controls the power supply timing and duration of the energy storage component to ensure that the electromagnetic coil 28 can obtain stable electrical energy at the node where enhanced air blowing is required, thereby generating a sufficiently strong electromagnetic repulsion force to drive the metal piston head 20 to move the second piston rod 24 relative to the first piston rod 22, thereby increasing the compression stroke and speed of the retractable piston assembly 2, and providing power support for the subsequent formation of enhanced air blowing and ensuring arc extinguishing effect.

[0072] In one exemplary embodiment, this application also provides a sulfur hexafluoride circuit breaker, which includes a sulfur hexafluoride circuit breaker body and the electromagnetic booster compression device in the above embodiment.

[0073] In one exemplary embodiment, such as Figure 3 As shown, this application provides an electromagnetic assist compression control method, applied to the electromagnetic assist compression device in the above embodiments. The method includes:

[0074] S302 collects the current flowing through the sulfur hexafluoride circuit breaker.

[0075] S304, when it is determined that a fault current is flowing through the sulfur hexafluoride circuit breaker, drives the retractable piston assembly to compress the sulfur hexafluoride gas in the cylinder.

[0076] S306, when it is determined that the fault current is greater than or equal to the preset current threshold, the retractable piston assembly is driven to extend to accelerate the compression of sulfur hexafluoride gas in the cylinder.

[0077] The specific implementation process and beneficial effects of the above-mentioned electromagnetic-assisted compression control method can be found in the description of the above-mentioned electromagnetic-assisted compression device embodiment, and will not be repeated here.

[0078] In one exemplary embodiment, such as Figure 4 As shown, when the fault current is determined to be greater than or equal to a preset current threshold, the retractable piston assembly is driven into an extended state to accelerate the compression of sulfur hexafluoride gas in the cylinder, including:

[0079] S402, when it is determined that the fault current is greater than or equal to the preset current threshold, the current rise rate is determined based on the fault current.

[0080] S404, obtain the transmission parameters of the control components and the contact opening distance parameters of the sulfur hexafluoride circuit breaker.

[0081] S406, determine the target driving time based on the transmission parameters, contact gap parameters and current rise rate; the target driving time is a certain moment before the current peak is reached or before the current crosses zero.

[0082] S408 drives the retractable piston assembly to the extended state at the target driving moment.

[0083] The preset current threshold is a standard value used by the controller to determine whether the retractable piston assembly needs to be extended. During the operation of the sulfur hexafluoride circuit breaker, the controller acquires the current flowing through the circuit breaker through a current sensor. When the current is determined to be a fault current and its value is greater than or equal to the preset current threshold, subsequent processes (such as determining the current rise rate and acquiring relevant parameters) are initiated to drive the retractable piston assembly to extend and accelerate the compression of sulfur hexafluoride gas. Its function is to distinguish between normal fault currents and extremely large fault currents requiring enhanced gas blowing, thus achieving on-demand control. The current rise rate is a parameter calculated by the controller based on the fault current after determining that the fault current is greater than or equal to the preset current threshold, reflecting how quickly the fault current changes over time. This parameter helps to predict the time when the fault current reaches its peak or zero-crossing point, ensuring that the retractable piston assembly is driven to extend at the appropriate time, so that the enhanced gas blowing is precisely matched with the moment of maximum arc energy, improving the arc extinguishing effect. The transmission parameters are parameters related to the motion characteristics of the transmission assembly, which are obtained by the controller from the transmission assembly of the control component. Since the transmission assembly is connected to the retractable piston assembly, its transmission parameters directly affect the initial motion state and speed of the retractable piston assembly. These parameters are crucial factors that the controller must consider when calculating the target drive moment, helping the controller more accurately determine when to extend the retractable piston assembly to effectively improve compression speed and stroke. The contact gap parameter, obtained by the controller from the sulfur hexafluoride circuit breaker, reflects the distance between the moving and stationary contacts of the circuit breaker. The contact gap size is closely related to the arc generation, maintenance, and extinction processes; its value changes affect arc energy and arc extinguishing requirements. Therefore, this parameter is an important reference for the controller to determine the target drive moment, ensuring that the retractable piston assembly extends at the optimal stage of contact gap adaptation to efficiently compress sulfur hexafluoride gas and form enhanced gas blowing. The target drive moment is the moment determined by the controller after comprehensive analysis of the acquired transmission parameters, contact gap parameters, and calculated current rise rate. This moment is used to drive the retractable piston assembly into the extended state, and it is a moment before the fault current reaches its peak or before the current crosses zero. The main purpose is to enable the retractable piston assembly to extend during the critical arc extinguishing stage (when the arc energy is at its maximum or about to cross zero), rapidly increasing the compression pressure and speed of sulfur hexafluoride gas to form an enhanced gas blowing effect, thus ensuring the successful extinguishing of the arc.

[0084] For example, the current sensor first monitors the current flowing through the sulfur hexafluoride (SF6) circuit breaker in real time and transmits the current signal to the controller. The controller analyzes the current signal, and if it determines that a fault current exists and that the fault current is greater than or equal to a preset current threshold, it initiates the subsequent control process. The current rise rate is determined based on the fault current to predict the time point of the fault current peak or zero-crossing; simultaneously, the transmission parameters of the control components and the contact opening distance parameters of the SF6 circuit breaker are acquired. Subsequently, the controller combines the transmission parameters, contact opening distance parameters, and current rise rate to comprehensively calculate and determine the target drive moment (this moment is the critical arc-extinguishing stage before the current peak or before the current zero-crossing). When the target drive moment is reached, the controller immediately drives the retractable piston assembly into an extended state. The retractable piston assembly expands through its own structure, instantly increasing the overall compression stroke. Simultaneously, its extension action, combined with the continuous driving force of the transmission components, significantly increases the movement speed within the compression cylinder. The increased stroke significantly amplifies the compression amplitude of the sulfur hexafluoride gas within the cylinder by the retractable piston assembly, while the increased speed shortens the gas compression time. Under the combined effect of these two factors, the sulfur hexafluoride gas is rapidly and deeply compressed in a very short time, causing the pressure to quickly rise to a higher level, thus creating enhanced air blowing. This enhanced air blowing acts on the arc generated by the separation of the moving and stationary contacts, cooling the arc and restoring the arc gap insulation through high pressure and high flow rate, thereby providing sufficient air blowing pressure to extinguish the arc.

[0085] In this embodiment, on-demand enhancement is achieved by setting a preset current threshold, avoiding unnecessary energy consumption. The current rise rate, transmission parameters, and contact opening distance parameters jointly support the controller in determining the target driving moment before the current peak or zero crossing, ensuring that the enhanced gas blow adapts to the critical arc extinguishing stage. The target moment drives the retractable piston assembly to extend, increasing both the compression stroke and speed, and quickly pushing up the sulfur hexafluoride gas pressure to form a strong gas blow for efficient arc extinguishing.

[0086] It should be understood that, although Figures 3-4 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figures 3-4 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0087] In one exemplary embodiment, such as Figure 5As shown, this application provides an electromagnetic assist compression control device, applied to the electromagnetic assist compression device in the above embodiments. The electromagnetic assist compression control device includes:

[0088] Data acquisition module 502 is used to acquire the current flowing through the sulfur hexafluoride circuit breaker;

[0089] The first drive module 504 is used to drive the retractable piston assembly to compress the sulfur hexafluoride gas in the cylinder when it is determined that a fault current is flowing through the sulfur hexafluoride circuit breaker.

[0090] The second drive module 506 is used to drive the retractable piston assembly into an extended state to accelerate the compression of sulfur hexafluoride gas in the cylinder when the fault current is determined to be greater than or equal to a preset current threshold.

[0091] In an exemplary embodiment, the second driving module 506 described above includes:

[0092] The current rise rate determination unit is used to determine the current rise rate based on the fault current when the fault current is determined to be greater than or equal to a preset current threshold.

[0093] The parameter acquisition unit is used to acquire the transmission parameters of the control component and the contact opening distance parameters of the sulfur hexafluoride circuit breaker.

[0094] The target driving time determination unit is used to determine the target driving time based on the transmission parameters, contact opening distance parameters, and current rise rate; the target driving time is a certain moment before the current peak is reached or before the current crosses zero.

[0095] The drive unit is used to drive the retractable piston assembly into the extended state at the target driving moment.

[0096] Specific limitations regarding the electromagnetic-assisted compression control device can be found in the limitations of the electromagnetic-assisted compression method described above, and will not be repeated here. Each module in the aforementioned electromagnetic-assisted compression control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module. It should be noted that the module division in this embodiment is illustrative and only represents a logical functional division; other division methods may be used in actual implementation.

[0097] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0098] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0099] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method described above.

[0100] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0101] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An electromagnetic assist compression device, characterized by, The device is applied to a sulfur hexafluoride circuit breaker, and the device comprises: a telescopic piston assembly arranged in a compression cylinder in the sulfur hexafluoride circuit breaker, the telescopic piston assembly being used to compress sulfur hexafluoride gas in the compression cylinder; a control assembly in transmission connection and electrical connection with the telescopic piston assembly, the control assembly being used to drive the telescopic piston assembly to compress the sulfur hexafluoride gas in the compression cylinder when a fault current flowing through the sulfur hexafluoride circuit breaker is monitored, and the telescopic piston assembly being driven to be in an extended state to accelerate compression of the sulfur hexafluoride gas in the compression cylinder when the fault current is greater than or equal to a preset current threshold.

2. The electromagnetic assist compression device of claim 1, wherein, The telescopic piston assembly comprises: a metal piston head; a first piston rod in transmission connection with the control assembly, the first piston rod having a containing space therein; a second piston rod, one end of the second piston rod being mechanically connected with the metal piston head, and the other end of the second piston rod being slidably inserted into the containing space; a lock catch structure arranged in the containing space, the lock catch structure being used to lock a relative movement distance of the second piston rod relative to the first piston rod; an electromagnetic coil wound around an outer periphery of the first piston rod, the electromagnetic coil being in electrical connection with the control assembly, and the electromagnetic coil being used to generate an electromagnetic repulsive force to push the metal piston head to move the second piston rod relative to the first piston rod under the power supply of the control assembly.

3. The electromagnetic assist compression device of claim 2, wherein, The second piston rod further comprises a limiting groove, and the containing space comprises a first containing cavity and a second containing cavity which are communicated and perpendicular to each other, the first containing cavity being used to contain the second piston rod, and the lock catch structure comprises: a spring arranged in the second containing cavity, one end of the spring being fixedly connected with an inner side wall of the first piston rod; a ball fixedly connected with the other end of the spring; and wherein the spring pushes the ball out to the limiting groove during the movement of the second piston rod relative to the first piston rod.

4. The electromagnetic assist compression device of any one of claims 1-3, wherein, The control assembly comprises: a transmission assembly in transmission connection with the telescopic piston assembly; a current sensor in series connection in a loop between a high-voltage line and the sulfur hexafluoride circuit breaker, the current sensor being used to monitor a current flowing through the sulfur hexafluoride circuit breaker; a controller in electrical connection with the transmission assembly, the current sensor and the telescopic piston assembly respectively, the controller being used to acquire the current flowing through the sulfur hexafluoride circuit breaker, drive the transmission assembly to drive the telescopic piston assembly to compress the sulfur hexafluoride gas in the compression cylinder when it is determined that the fault current exists, and drive the telescopic piston assembly to be in the extended state to accelerate compression of the sulfur hexafluoride gas in the compression cylinder when it is determined that the fault current is greater than or equal to the preset current threshold.

5. The electromagnetic assist compression device of claim 4, wherein, In the case that the telescopic piston assembly comprises a metal piston head, a first piston rod, a second piston rod, a locking structure and an electromagnetic coil, the control assembly further comprises: a storage energy assembly, which is electrically connected with the controller and the electromagnetic coil respectively; wherein the controller is configured to control the storage energy assembly to supply power to the electromagnetic coil in the case that the fault current is greater than or equal to the preset current threshold.

6. An electromagnetic assist compression control method characterized by, The method is applied to the electromagnetic force compression device as claimed in any one of claims 1-5, and the method comprises: collecting the current flowing through the SF6 circuit breaker; driving the telescopic piston assembly to compress the SF6 gas in the compression cylinder in the case that the fault current is determined to flow through the SF6 circuit breaker; driving the telescopic piston assembly to be in an extended state to accelerate the compression of the SF6 gas in the compression cylinder in the case that the fault current is determined to be greater than or equal to the preset current threshold.

7. The electromagnetic assist compression control method of claim 6, wherein, The driving the telescopic piston assembly to be in an extended state to accelerate the compression of the SF6 gas in the compression cylinder in the case that the fault current is determined to be greater than or equal to the preset current threshold comprises: determining a current rising rate according to the fault current in the case that the fault current is determined to be greater than or equal to the preset current threshold; obtaining a transmission parameter of the control assembly and a contact opening distance parameter of the SF6 circuit breaker; determining a target driving time according to the transmission parameter, the contact opening distance parameter and the current rising rate; the target driving time is a certain time before reaching a current peak value or a current zero-crossing point; driving the telescopic piston assembly to be in an extended state at the target driving time.

8. An electromagnetic assist compression control device characterized by, The electromagnetic force compression control device is applied to the electromagnetic force compression device as claimed in any one of claims 1-5, and the electromagnetic force compression control device comprises: a data collection module configured to collect the current flowing through the SF6 circuit breaker; a first driving module configured to drive the telescopic piston assembly to compress the SF6 gas in the compression cylinder in the case that the fault current is determined to flow through the SF6 circuit breaker; a second driving module configured to drive the telescopic piston assembly to be in an extended state to accelerate the compression of the SF6 gas in the compression cylinder in the case that the fault current is determined to be greater than or equal to the preset current threshold.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by a processor to implement the steps of the method as claimed in any one of claims 6-7.

10. A sulfur hexafluoride circuit breaker characterized by, The SF6 circuit breaker comprises: an SF6 circuit breaker body; and the electromagnetic force compression device as claimed in any one of claims 1-5.

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