A smart isolation fast circuit breaker

Abstract

This invention discloses an intelligent isolation fast circuit breaker, belonging to the technical field of high-voltage switchgear. The circuit breaker includes a horizontal sealed gas chamber, a drive coil module, and a pluggable integrated control power supply compartment. The gas chamber is divided into an arc-extinguishing chamber, a permanent magnet mechanism chamber, and a sensor chamber. The moving contact shaft of the vacuum arc-extinguishing chamber is rigidly connected to the output shaft of the permanent magnet mechanism via an insulated coupling. The drive coil module is sleeved outside the gas chamber and drives the internal permanent magnet rotor to rotate through magnetic coupling in a non-contact manner, thereby causing the contacts to open and close. This completely eliminates the dynamic sealing points penetrating the gas chamber, greatly improving the long-term reliability of gas insulation. The integrated control power supply compartment adopts a modular pluggable design, integrating protection, communication, hybrid energy harvesting, and drive circuits. It can be quickly replaced in case of failure, greatly shortening maintenance time. This invention combines the advantages of high reliability, fast action, low maintenance cost, and intelligent monitoring, and is suitable for the protection and control of overhead lines in power distribution networks.

Description

Technical Field

[0001] This invention relates to the field of electrical device technology, and specifically to an intelligent isolation fast circuit breaker. Background Technology

[0002] In overhead power distribution lines, pole-mounted circuit breakers are key equipment for line protection, control, and isolation. Currently, the mainstream products in this field are mainly divided into two categories according to their insulation and arc-extinguishing media: air-insulated circuit breakers and gas-insulated (including vacuum) circuit breakers.

[0003] 1. Air-insulated circuit breakers: These devices typically employ a vertical layout, with the arc-extinguishing chamber (mostly a vacuum arc-extinguishing chamber) and operating mechanism located at the top or middle, connected to the operating mechanism at the bottom via an insulating rod. Their greatest advantage is their relatively simple structure, low cost, and intuitive maintenance. However, they have significant drawbacks: First, to ensure sufficient air insulation distance, the overall size of the equipment is large, especially in polluted or humid environments where external insulation performance deteriorates, posing a flashover risk. Second, the mechanical transmission chain between the operating mechanism and the arc-extinguishing chamber is long, including multiple cranks, connecting rods, and pins, which are prone to wear, jamming, or deformation under long-term frequent operation or extreme temperature differences, leading to unstable operating characteristics. Finally, all its live parts and mechanical structures are exposed to the air, making them susceptible to corrosion from dust, salt spray, bird droppings, etc., requiring frequent maintenance.

[0004] 2. Gas-Insulated Circuit Breakers: To reduce size and improve environmental tolerance, gas-insulated (such as SF6 or composite gases) or vacuum-insulated pole-mounted circuit breakers have emerged. In existing technology, a common design is to seal the vacuum interrupter within a gas-filled metal housing. The output shaft of its operating mechanism needs to penetrate the housing wall through a dynamic sealing component (such as a bellows or a precision-fitted sliding seal) to drive the movement of the interrupter contacts within the housing. This design introduces new problems: the dynamic seal is a weak point in reliability. During long-term operation, the sealing material will age, and the mating surfaces will wear, especially under outdoor temperature variations, ultraviolet radiation, and mechanical vibration, posing a risk of chronic gas leakage. Once the gas pressure decreases, the insulation and arc-extinguishing performance will severely deteriorate. Furthermore, even when using a vacuum interrupter, its bellows itself is a metal dynamic seal, inherently at risk of fatigue fracture.

[0005] Furthermore, existing pole-mounted circuit breakers, whether air-insulated or gas-insulated, are mostly of integrated or simple split-type structure. Control units, sensors, power management modules, etc., are often tightly coupled with the mechanism and integrated into one or two housings. When the electronic components need to be upgraded or malfunction, it is often necessary to open the main housing and perform complex internal wiring disassembly, which is inconvenient for maintenance and may affect the airtightness or mechanical integrity of the main circuit during the process.

[0006] In summary, the core contradiction currently facing pole-mounted circuit breakers lies in the irreconcilable conflict between improving insulation reliability (using gas sealing) and ensuring mechanical drive reliability (avoiding dynamic seal leakage); simultaneously, there is also a contradiction between equipment functional integration and ease of on-site maintenance. The market urgently needs a new circuit breaker structure that can utilize the advantages of gas insulation, completely eliminate external dynamic seal leakage points, and facilitate maintenance. Summary of the Invention

[0007] The technical problem this invention aims to solve is to provide an intelligent, fast-acting, isolated circuit breaker. This breaker utilizes magnetic coupling to non-contactly drive the internal permanent magnet rotor, thereby opening and closing the contacts. This completely eliminates the dynamic sealing points that penetrate the gas chamber, significantly improving the long-term reliability of gas insulation. The integrated control and power supply compartment adopts a modular, pluggable design, integrating protection, communication, hybrid energy harvesting, and drive circuits. It allows for rapid replacement in case of failure, greatly shortening maintenance time and thus addressing the technical problems mentioned above.

[0008] To achieve the above objectives, the present invention provides an intelligent isolation fast circuit breaker, comprising:

[0009] A horizontal sealed gas box is filled with insulating gas and is axially divided into an arc-extinguishing chamber, a permanent magnet mechanism chamber, and a sensor chamber by a first insulating partition and a second insulating partition. The arc-extinguishing chamber contains a vacuum arc-extinguishing chamber, whose moving contact shaft passes through the first insulating partition and extends into the permanent magnet mechanism chamber. The permanent magnet mechanism chamber contains a permanent magnet operating mechanism, the output shaft of which is coaxially connected to the moving contact shaft via an insulating coupling.

[0010] The drive coil module is sleeved and fixed on the outside of the horizontal sealed air box at the position corresponding to the cavity of the permanent magnet mechanism;

[0011] The pluggable control power supply compartment is electrically connected to the drive coil module and the sensor located in the sensor cavity via a quick connector; the pluggable control power supply compartment is equipped with a power management and drive board for controlling the drive coil module to generate a drive magnetic field.

[0012] As a further option, the moving contact end face of the vacuum interrupter is provided with a first contact protrusion, and the corresponding stationary contact terminal contact surface is provided with a second contact protrusion; the rotation of the moving contact shaft can drive the moving contact and the stationary contact terminal to press or separate through the cooperation of the first contact protrusion and the second contact protrusion.

[0013] As a further option, the inner holes at both ends of the insulating coupling sleeve are provided with internal splines, which engage and fix with the external splines at the ends of the output shaft and the moving contact shaft, respectively.

[0014] As a further option, the drive coil module includes a toroidal core and an excitation coil wound thereon, wherein the toroidal core forms a magnetic coupling path with the shell of the horizontal sealed gas box.

[0015] As a further option, the housing of the horizontal sealed gas box may be made of a low magnetic resistance material or thinned in the area corresponding to the drive coil module.

[0016] As a further option, the pluggable control power supply integrated compartment also includes a control protection board, a communication board, and a hybrid power management board; the power management and drive board integrates a supercapacitor bank, an H-bridge drive circuit, and a lithium battery.

[0017] As a further option, the hybrid energy harvesting management board is used to manage energy from the capacitive voltage divider energy harvesting unit inside the sensor cavity, energy from the small flexible solar panel on the roof, and energy from the lithium battery.

[0018] As a further option, the sensor cavity is equipped with a current sensor and a capacitive voltage divider energy harvesting unit mounted on the main conductive circuit conductor, and the signal and power lines are led out through high-voltage sealed terminals.

[0019] As a further option, the left and right ends of the horizontal sealed gas box are respectively connected to the left and right insulators and the right insulators. The main conductive circuit conductor inside passes through the three chambers in sequence and connects to the stationary contact terminal of the vacuum interrupter and the insulators at both ends.

[0020] As a further option, a self-lubricating sealed bearing is provided at the position where the moving contact shaft passes through the first insulating partition.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By using magnetic coupling transmission technology, all mechanical transmission shafts that penetrate the gas box are eliminated, and the dynamic seal, which is most prone to leakage, is replaced with a static seal, which greatly improves the long-term reliability of gas insulation and reduces maintenance.

[0023] 2. The horizontal layout lowers the equipment's center of gravity and height, resulting in strong wind resistance. The modular design makes the air box body purely mechanical and passive, while integrating intelligent control and power supply into a pluggable unit, allowing for quick replacement in case of failure and significantly shortening the average repair time.

[0024] 3. The permanent magnet mechanism inside the chamber is directly connected to the arc-extinguishing chamber, with no intermediate conversion link, resulting in less mechanical wear, less dispersion of action time, and longer service life.

[0025] 4. The hybrid power supply strategy ensures that the control, protection, and communication systems have a reliable energy source and high equipment uptime under various line operating conditions and weather conditions. Attached Figure Description

[0026] Figure 1 A schematic diagram of the internal structure of an embodiment of the present invention.

[0027] Figure 2 A schematic diagram of the internal contact closing in an embodiment of the present invention.

[0028] Figure 3 A schematic diagram of the internal contact tripping mechanism in an embodiment of the present invention.

[0029] Figure 4 A schematic diagram of the internal structure of the drive coil module in an embodiment of the present invention.

[0030] Figure 5 A schematic diagram of the installation structure of the pluggable control power supply integrated compartment according to an embodiment of the present invention.

[0031] Figure 6 Internal architecture diagram of the integrated power supply compartment in an embodiment of the present invention.

[0032] In the diagram: 100, horizontal sealed gas box; 101, sealed metal shell; 102, first insulating partition; 103, second insulating partition; 110, arc-extinguishing chamber cavity; 111, vacuum arc-extinguishing chamber; 112, stationary contact terminal; 113, moving contact shaft; 114, self-lubricating sealed bearing; 115, moving contact; 116, first contact protrusion; 117, second contact protrusion; 120, permanent magnet mechanism cavity; 121, permanent magnet rotor; 122, stator yoke; 123, output shaft; 125, insulating coupling sleeve; 130, sensor cavity; 131, current sensor; 132, capacitive voltage divider. Energy harvesting unit; 133, high-voltage sealed terminal; 200, drive coil module; 201, toroidal core; 202, excitation coil; 203, epoxy resin; 300, integrated power supply compartment; 301, compartment body; 302, quick connector; 331, control and protection board; 332, communication board; 340, power management and drive board; 341, supercapacitor bank; 342, H-bridge drive circuit; 343, lithium battery; 350, hybrid energy harvesting management board; 352, small flexible solar panel; 400, incoming and outgoing line module; 401, left incoming and outgoing line insulator; 402, right incoming and outgoing line insulator; Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figure 1As shown, the intelligent isolation fast circuit breaker of this invention adopts a modular horizontal layout and mainly includes four independent functional units: a horizontal sealed gas chamber 100, a drive coil module 200, a pluggable control power supply integrated compartment 300, and an incoming / outgoing line module 400. The units are connected through standardized electrical and mechanical interfaces, achieving functional decoupling and rapid assembly / disassembly.

[0035] I. Detailed Structure and Electrical Connections of the Horizontal Sealed Air Box 100

[0036] like Figure 1 As shown, the horizontal sealed gas box 100 is the core of the primary circuit of the entire equipment. Its main body is a horizontally placed cylindrical sealed metal shell 101, usually welded from stainless steel, with standard elliptical end caps at both ends. The shell is filled with a constant-pressure dry, environmentally friendly insulating gas.

[0037] Two epoxy resin insulating partitions (102, 103) are arranged parallel to each other along the axial direction inside the housing, which strictly divide the internal space into three continuous but airtight isolated chambers: from left to right, they are the arc extinguishing chamber 110, the permanent magnet mechanism chamber 120 and the sensor chamber 130.

[0038] The electrical connection path of the primary main circuit is as follows:

[0039] The incoming / outgoing line module 400 includes incoming / outgoing line insulators (401, 402) located at the left and right ends of the gas box, respectively. A main conductive circuit conductor forms the backbone of the current path. The left end of this conductor passes through the left end cap and is rigidly electrically connected to the conductive terminal of the left incoming / outgoing line insulator 401. At the same time, this connection point is also reliably connected to the stationary contact terminal 112 of the vacuum interrupter 111 installed in the interrupter chamber 110. The main conductive circuit conductor starts from the stationary contact terminal 112, passes horizontally through the interrupter chamber 110, the permanent magnet mechanism chamber 120, and the sensor chamber 130 in sequence, and its right end passes through the right end cap and is rigidly electrically connected to the conductive terminal of the right incoming / outgoing line insulator 402. Thus, a complete series conductive path is formed from the left incoming / outgoing line insulator 401, through the stationary contact of the vacuum interrupter 111, through its internal contact (when closed) or break (when open), and then through the main conductive circuit conductor, finally reaching the right incoming / outgoing line insulator 402.

[0040] Arc-extinguishing chamber 110 and rotary direct-drive contact structure:

[0041] The core breaking element—a rotary double-break vacuum interrupter 111—is installed within this cavity. The electrical connection of its stationary contact terminal 112 is as described above. The key component is its moving contact shaft 113, which extends horizontally to the right, passes through a self-lubricating sealed bearing 114 located at the center of the first insulating partition 102, and precisely extends into the permanent magnet mechanism cavity 120. The moving contact shaft 113 is rigidly connected to the moving contact conductive rod inside the vacuum interrupter 111, forming an integral "moving contact rotor." A metal bellows provides a dynamic rotational seal between the moving contact shaft 113 and the interrupter housing, ensuring a high internal vacuum.

[0042] Its core operating principle lies in the contact structure design, which allows the rotational motion of the moving contact shaft 113 to be directly converted into the opening and closing of the contacts, without the need for an internal motion conversion mechanism. For example... Figures 1-3 As shown, the following are preferred embodiments:

[0043] The moving contact assembly of the vacuum interrupter 111 includes a moving contact conductive rod fixedly connected to the moving contact shaft 113, with a moving contact 115 fixed to its end. The contact surface of the moving contact 115 is machined into a first contact protrusion 116, and there is an insulating gap between the moving contact 115 and the end face of the stationary contact terminal 112, which is coated or wrapped with insulating material. Correspondingly, the contact surface of the stationary contact terminal 112 is machined into a second contact protrusion 117 that matches the first contact protrusion 116. When the moving contact shaft 113 is driven to rotate, it drives the moving contact 115 to rotate synchronously. Due to the arc-shaped protrusions, when the first contact protrusion 116 rotates, this process generates displacement in the circumferential direction and a forced pressing or separating displacement in the axial direction (perpendicular to the contact surface direction). When rotated to a specific angle (closed position), the two inclined surfaces are completely in contact, generating the required contact pressure; when rotated in the opposite direction to another angle (open position), the two inclined surfaces are completely separated, forming a set insulating gap.

[0044] Permanent magnet mechanism cavity 120 and core direct drive transmission:

[0045] This chamber is the central hub for converting driving force, and its structure is key to achieving highly reliable transmission. Figure 3 As shown.

[0046] Mechanism Composition: A bistable permanent magnet operating mechanism is installed inside the cavity, mainly comprising a permanent magnet rotor 121 and an annular stator yoke 122, which are encapsulated within a non-magnetic protective cover 124. An output shaft 123 is fixed at the center of the permanent magnet rotor 121.

[0047] Core transmission connection – direct connection with insulating coupling sleeve: In order to achieve lossless and lag-free transmission, the output shaft 123 of the permanent magnet mechanism and the moving contact shaft 113 of the vacuum interrupter are rigidly coaxially directly connected through an insulating coupling sleeve 125.

[0048] Specific connection structure: Precision external splines are machined at the mating ends of the output shaft 123 and the moving contact shaft 113. The coupling sleeve 125 is a short sleeve made of high-strength material, with internal splines machined at both ends of its inner bore for precise fit. During assembly, the external splines of the two shafts are inserted into the internal splines at both ends of the coupling sleeve 125, and secured by axial locking components (such as retaining rings) or radial set screws.

[0049] Transmission effect: This backlash-free spline meshing ensures that any angular displacement of the permanent magnet rotor 121 can be instantly and synchronously transmitted 1:1 to the moving contact shaft 113, achieving zero-backlash transmission. The extremely short rigid connection and the absence of any intermediate conversion links (such as connecting rods or gears) result in extremely high rigidity of the entire transmission system and extremely low mechanical loss and motion error. At the same time, the coupling sleeve 125 provides reliable electrical isolation between the high-potential main circuit and the ground-potential operating mechanism.

[0050] Sensor cavity 130:

[0051] The main conductive circuit conductor passes through this cavity, with its end rotating to the electrical connection terminal 402. A low-power current sensor 131 (such as a Rogowski coil) and a capacitive voltage divider power harvesting unit 132 are non-contactly mounted on the conductor. Their signal and power lines are connected to the high-voltage sealed terminal 133 fixed to the second insulating partition 103 on the right side, thus extending to the outside of the gas chamber.

[0052] II. Drive coil module 200 and magnetic coupling drive principle

[0053] like Figure 4 As shown, the drive coil module 200 is an external actuator that realizes "contactless drive".

[0054] Structure: Its main body is a ring-shaped electromagnetic component, consisting of a ring-shaped iron core 201 and an excitation coil 202 wound on it, and is vacuum-encapsulated with epoxy resin 203 into a robust integral module.

[0055] Installation and Magnetic Circuit Optimization: The module is fitted onto the outer side of the middle of the horizontal sealed gas box 100, with its axial center precisely aligned with the internal permanent magnet mechanism cavity 120, and secured with stainless steel clamps. In the annular region corresponding to the module and the gas box shell 101, a section of low magnetic resistance non-magnetic alloy sleeve is used to replace the ordinary shell, or the shell is precisely thinned to significantly reduce the magnetic circuit resistance and improve the magnetic coupling efficiency.

[0056] Working principle: When opening or closing the circuit breaker is required, the H-bridge drive circuit within the integrated power supply compartment 300 instantly releases energy, injecting a large, controllable current pulse into the excitation coil 202. This current generates a powerful pulsed magnetic field, which penetrates the low magnetic reluctance bushing and acts on the permanent magnet rotor 121 within the permanent magnet mechanism cavity 120, generating a magnetic torque that drives its rotation. By controlling the direction of the current, the rotor's rotation is controlled, thereby achieving the opening and closing operation. The entire process involves no mechanical connection penetrating the air box.

[0057] III. Modular Design of the Pluggable Control Power Supply Compartment 300

[0058] like Figures 5-6 As shown, this compartment is a completely independent intelligent control and energy management unit.

[0059] External Structure: The enclosure 301 is a high-protection-level (IP67) metal box. A multi-functional waterproof quick connector (female) 302 is centrally mounted on its back panel. All connecting cables (to the drive coil, sensor, power harvesting unit, communication antenna, etc.) are pre-fabricated and terminated with male connectors.

[0060] Internal architecture (layered plug-in type):

[0061] Control and protection board 331: integrates a microprocessor, sampling and input / output circuits, and is responsible for protection logic judgment and device control.

[0062] Communication board 332: integrates a dual-mode communication module (such as 4G / 5G and carrier) to enable remote data interaction.

[0063] The power management and driver board 340 consists of a supercapacitor bank 341 (stores driving energy), an H-bridge driver circuit 342 (controls the direction and timing of energy release), and a lithium battery 343 (backup power).

[0064] Hybrid Energy Management Board 350: Intelligent management of three energy inputs: the main energy source is the capacitor voltage divider energy harvesting unit 132 inside the gas tank, the auxiliary energy source is the small flexible solar panel 352 integrated on the roof of the tank, and the backup energy source is the lithium battery 343. This board ensures uninterrupted operation of the control unit under any operating conditions and provides float charging for the supercapacitor.

[0065] Plug-and-play maintainability: During on-site installation or maintenance, simply plug and lock the quick connector 302 on the back of the compartment to the corresponding male wire harness connector on the equipment side. When the control unit malfunctions or needs upgrading, the entire control compartment can be removed and replaced without operating the high-voltage equipment; simply disconnect this connector, and the equipment can be restored to intelligent operation within minutes.

[0066] IV. Work Process

[0067] During normal operation, the integrated power supply unit 300 continuously monitors line information from the current sensor 131. When the protection logic determines a fault requiring tripping, the integrated power supply unit 300 immediately instructs the hybrid energy management board 350 and the H-bridge drive circuit 342 to release the energy stored in the supercapacitor bank 341 in pulse form to the drive coil 202. The magnetic field generated by the coil drives the permanent magnet rotor 121 to rotate, which in turn drives the contact shaft 113 to rotate via the coupling sleeve 125. This causes the moving contact of the vacuum interrupter 111 (in a wedge or eccentric manner) to quickly separate, interrupting the fault current. Status information is reported in real time via the communication board 332. The closing process is similar, only the direction of the drive pulse is reversed.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A smart isolation fast circuit breaker, characterized in that, include: A horizontal sealed gas box (100) is filled with insulating gas and is divided axially into an arc-extinguishing chamber (110), a permanent magnet mechanism chamber (120), and a sensor chamber (130) by a first insulating partition (102) and a second insulating partition (103). The arc-extinguishing chamber (110) is provided with a vacuum arc-extinguishing chamber (111), and the moving contact shaft (113) of the vacuum arc-extinguishing chamber (111) extends into the permanent magnet mechanism chamber (120) through the first insulating partition (102). The permanent magnet mechanism chamber (120) is provided with a permanent magnet operating mechanism, and the output shaft (123) of the permanent magnet operating mechanism is coaxially connected to the moving contact shaft (113) through an insulating coupling sleeve (125). The drive coil module (200) is sleeved and fixed on the outside of the horizontal sealed air box (100) at the position corresponding to the permanent magnet mechanism cavity (120); The pluggable control power integrated compartment (300) is electrically connected to the drive coil module (200) and the sensor disposed in the sensor cavity (130) via a quick connector (302); the pluggable control power integrated compartment (300) is provided with a power management and drive board (340) for controlling the drive coil module (200) to generate a drive magnetic field.

2. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, The moving contact (115) end face of the vacuum interrupter (111) is provided with a first contact protrusion (116), and the corresponding stationary contact terminal (112) contact surface is provided with a second contact protrusion (117); the rotation of the moving contact shaft (113) can drive the moving contact (115) and the stationary contact terminal (112) to press or separate through the cooperation of the first contact protrusion (116) and the second contact protrusion (117).

3. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, The insulating coupling sleeve (125) has internal splines at both ends, which engage and fix with the external splines at the ends of the output shaft (123) and the moving contact shaft (113), respectively.

4. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, The drive coil module (200) includes an annular iron core (201) and an excitation coil (202) wound thereon, and a magnetic coupling path is formed between the annular iron core (201) and the shell of the horizontal sealed air box (100).

5. The intelligent isolation fast circuit breaker according to claim 4, characterized in that, The housing of the horizontal sealed air box (100) is made of a low magnetic resistance material or is thinned in the area corresponding to the drive coil module (200).

6. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, The pluggable control power integrated compartment (300) is also equipped with a control protection board (331), a communication board (332) and a hybrid power management board (350); the power management and drive board (340) integrates a supercapacitor group (341), an H-bridge drive circuit (342) and a lithium battery (343).

7. The intelligent isolation fast circuit breaker according to claim 6, characterized in that, The hybrid energy harvesting management board (350) is used to manage the energy from the capacitor voltage divider energy harvesting unit (132) in the sensor cavity (130), the energy from the small flexible solar panel (352) on the top of the silo, and the energy from the lithium battery (343).

8. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, The sensor cavity (130) is equipped with a current sensor (131) and a capacitor voltage divider energy harvesting unit (132) mounted on the main conductive circuit conductor, and the signal and power lines are led out through the high-voltage sealed terminal (133).

9. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, The left and right ends of the horizontal sealed gas box (100) are respectively connected to the left inlet / outlet insulator (401) and the right inlet / outlet insulator (402). The main conductive circuit conductor inside passes through the three chambers in sequence and connects to the stationary contact terminal (112) of the vacuum interrupter (111) and the insulators at both ends.

10. The intelligent isolation fast circuit breaker according to claim 1, characterized in that, A self-lubricating sealed bearing (114) is provided at the position where the moving contact shaft (113) passes through the first insulating partition (102).

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