A circuit breaker

Abstract

The application discloses a circuit breaker and belongs to the technical field of pole-mounted switches, which comprises a circuit breaker body, a current transformer module and a transmission module arranged on the same side of the circuit breaker, and a knife switch module arranged on the transmission module, wherein the knife switch module comprises a visual sealed box body, a moving knife base and an isolated static knife arranged in the sealed box body, an isolated knife switch connected with the moving knife base and the isolated static knife at two ends, and an insulating pull rod connected with the isolated knife switch at one end and extended out of the sealed box body and connected with the transmission module; the integrated design of the visual sealed box body and the built-in isolated knife provides a pole-mounted circuit breaker with excellent weather resistance, visual fracture state, safe and reliable operation and convenient maintenance, which meets the explicit requirements of the primary and secondary fusion of distribution networks on the built-in isolated fracture and fundamentally eliminates various safety and reliability problems caused by environmental erosion, foreign object lapping and invisible fracture in the prior art.

Description

Technical Field

[0001] This invention relates to the field of pole-mounted switch technology, and more specifically to a circuit breaker. Background Technology

[0002] In recent years, insulation upgrades to overhead power distribution lines have significantly reduced line failure rates. However, the widely used pole-mounted circuit breakers generally employ external disconnect switches, leaving their conductive parts exposed for extended periods without effective sealing and protection, which is incompatible with the trend towards improved line insulation.

[0003] In the field of power distribution switches, vacuum circuit breakers hold an absolute dominant position, accounting for over 98.9% of the State Grid's tenders in 2025. However, vacuum interrupters have inherent drawbacks: insulation strength decreases significantly when the vacuum level drops, leakage current at the break point may cause personal injury, and the vacuum level is difficult to monitor in real time. Therefore, existing technologies typically require the configuration of an external disconnecting switch to provide a "visible" break. However, while the break point of an external disconnecting switch is physically visible, it lacks sealing protection, and the internal state of the vacuum interrupter is completely invisible. Maintenance personnel cannot visually determine whether the interrupter has failed, posing a safety hazard.

[0004] External disconnect switches are constantly exposed to rain, moisture, salt spray, dust, and industrial pollution, making them prone to contact oxidation and corrosion, increased contact resistance, excessive temperature rise, and jamming or incomplete opening and closing, resulting in a shorter lifespan. Their live parts lack shielding, making them susceptible to short circuits caused by branches, plastic film, or other foreign objects bridging them in windy weather. Furthermore, installing the disconnect switch and circuit breaker as two separate devices occupies a large space and results in messy wiring; even with an integrated configuration, the terminals and blades remain fully exposed, leading to corrosion and operational inconvenience. Statistics show that faults related to external disconnect switches have gradually become a significant contributing factor to overhead power line failures.

[0005] Although standardization work has clearly required that pole-mounted switches should have built-in isolating contacts or the ability to replace them, mature pole-mounted circuit breaker solutions with built-in isolating contacts are still relatively scarce in the market. More importantly, the few existing built-in isolation solutions generally fail to solve the overall sealing problem, and the actual status (closed / open) of the internal isolating contact cannot be directly observed from the outside. Operators lack intuitive means of confirmation, posing a risk of misoperation. At the same time, the enclosure lacks a micro-positive pressure protection design, making it susceptible to moisture, condensation, and dust intrusion after long-term operation, leading to decreased insulation performance and insufficient weather resistance.

[0006] In summary, existing technologies suffer from the following combined drawbacks: external solutions are highly susceptible to environmental influences and have a high failure rate; internal solutions lack sealing protection and break point visualization capabilities, making it difficult to guarantee operational safety. Developing a circuit breaker with an internal isolating switch that allows for external visualization of the internal isolation break point and is supplemented with micro-positive pressure protection to improve weather resistance has become a pressing technical challenge for the industry. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a circuit breaker that avoids various safety and reliability issues caused by environmental erosion, foreign object overlap, and invisible break points.

[0008] To achieve the above objectives, the present invention provides the following solution: A circuit breaker includes a circuit breaker body, a current transformer module and a transmission module disposed on the same side of the circuit breaker, and a disconnector module disposed on the transmission module. The disconnector module includes a visible sealed housing, a moving knife base and an isolating stationary knife disposed in the sealed housing, an isolating disconnector connected at both ends to the moving knife base and the isolating stationary knife respectively, and an insulating pull rod with one end connected to the isolating disconnector and the other end extending out of the sealed housing and connected to the transmission module.

[0009] Preferably, the sealed enclosure includes closed frames arranged side by side at intervals, the frames forming the skeleton structure of the sealed enclosure, visible panels are sealed on both sides of the frame, sealing plates are provided on the top and front and rear of the frame, and a first sealing gasket is provided in the area where the frame connects with the visible panels.

[0010] Preferably, a second sealing gasket is provided in the area where the sealed housing contacts the transmission module.

[0011] Preferably, the isolating knife gate includes two current-carrying knife bodies arranged side by side at intervals, a first bolt disposed at one end of the current-carrying knife bodies and passing through all the current-carrying knife bodies, a knife head pressure plate disposed at the other end of the current-carrying knife bodies and located on the outside of the two current-carrying knife bodies respectively, a second bolt for passing through the current-carrying knife bodies and the knife head pressure plate, a contact spring sleeved on the second bolt, a cotter pin disposed in the middle region of the current-carrying knife bodies, an adjusting threaded sleeve disposed on the cotter pin, and an adjusting rod disposed on the adjusting threaded sleeve for connecting the insulating pull rod. The contact spring and the adjusting rod are both located in the region between the two current-carrying knife bodies. The first bolt is close to the moving knife base, and the second bolt is close to the isolating stationary knife.

[0012] Preferably, a bowl-shaped washer is provided at the contact point between the first bolt and the outer side of the flow-carrying blade body.

[0013] Preferably, both the current-carrying blade and the isolating stationary blade are made of chromium zirconium copper material, and both have a silver plating layer on their surfaces.

[0014] Preferably, the transmission module includes a transmission housing, an isolation spindle disposed within the transmission housing, a splitting crank arm disposed on the isolation spindle, a pull rod crank arm connected to the splitting crank arm, and a splitting handle for connecting to the isolation spindle and for controlling the rotation of the isolation spindle, wherein the pull rod crank arm is hinged to the bottom end of the insulating pull rod.

[0015] Preferably, it also includes a split-opening limiting crank arm for limiting the rotation angle of the lever crank arm.

[0016] Preferably, it also includes a crossbeam and a combined compression spring disposed in the transmission housing, one end of the combined compression spring being connected to the crossbeam and the other end being connected to the opening and closing limiting crank arm.

[0017] Preferably, the top surface of the transmission housing is provided with an interface hole for installing the current transformer module.

[0018] The present invention achieves the following technical effects compared to the prior art: This invention encapsulates the isolating switch module within a transparent, visible space using a visually sealed enclosure, allowing maintenance personnel to directly and clearly observe its opening and closing status. This fundamentally solves the problem of "blind operation and blind inspection" in traditional circuit breakers, significantly improving operational safety and inspection efficiency. Simultaneously, this sealed structure effectively isolates the isolating switch from external dust, moisture, and small animals, reducing the risk of insulation failure and corrosion, and ensuring long-term reliable operation in high humidity, vibration, and confined space environments. Combined with the internal and external isolation transmission of the insulating pull rod and the modular layout on the same side, this compact structure achieves both physical protection and visual monitoring of the isolating switch, supporting intelligent operation and maintenance needs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a connection diagram of the current transformer module, transmission module, and disconnector module of the present invention; Figure 4This is a schematic diagram of the isolating switch of the present invention; Figure 5 This is a schematic diagram of the internal structure of the present invention; The components include: 1. Knife switch module; 2. Current transformer module; 3. Circuit breaker body; 4. Transmission module; 11. Moving knife base; 12. First sealing gasket; 13. Sealing housing; 14. Visual panel; 15. Isolating knife switch; 16. Isolating stationary knife switch; 17. Insulating pull rod; 18. Second sealing gasket; 151. First bolt; 152. Cup-shaped gasket; 153. Adjusting threaded sleeve; 154. Cotter pin; 155. Current-carrying knife body; 156. Knife head pressure plate; 157. Contact compression spring; 158. Adjusting rod; 41. Isolating spindle; 42. Opening / closing crank arm; 43. Pull rod crank arm; 44. Insulating pull rod; 45. Combined compression spring assembly; 46. Crossbeam; 47. Transmission housing; 48. Opening / closing limit crank arm. Detailed Implementation

[0021] 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.

[0022] This invention provides a circuit breaker that avoids various safety and reliability problems caused by environmental erosion, foreign object overlap, and invisible break points.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] refer to Figures 1 to 5A circuit breaker includes a circuit breaker body 3, a current transformer module 2 and a transmission module disposed on the same side of the circuit breaker, and a disconnector module 1 disposed on the transmission module. The disconnector module 1 includes a visible sealed housing 13, a moving knife base 11 and an isolating stationary knife 16 disposed within the sealed housing 13, an isolating disconnector 15 connected at both ends to the moving knife base 11 and the isolating stationary knife 16 respectively, and an insulating pull rod 4417 connected at one end to the isolating disconnector 15 and extending out of the sealed housing 13 and connected to the transmission module at the other end; specifically, through Integrating the disconnector module 1 into the visual sealed enclosure 13 effectively isolates the external environment (such as moisture, dust, small animals, etc.) from the operating components of the disconnector, reducing the risk of short circuits or malfunctions caused by external contamination or foreign objects, and improving the overall protection level (IP rating) of the equipment. Because the sealed enclosure 13 is visually accessible, maintenance personnel can directly observe the opening and closing status of the internal disconnector 15, contact erosion, foreign objects, condensation, and other abnormal phenomena without opening the enclosure. This facilitates early detection of potential problems and reduces unplanned downtime and live maintenance operations. Placing the current transformer module 2 and the transmission module on the same side of the circuit breaker body 3, combined with the insulating pull rod 17 extending from the side of the sealed enclosure 13, allows the disconnector module 1, the transformer, and the transmission mechanism to be compactly arranged in the same direction. This shortens the conductive circuit length, reduces the unevenness of the interphase electric field, and helps to reduce the overall size of the unit, facilitating installation and maintenance within the switchgear. The insulating tie rod 4417 passes through the wall of the sealed housing 13 and connects directly to the external transmission module, avoiding the need for complex internal linkage mechanisms, reducing the risk of jamming or wear of moving parts, while maintaining a short transmission path and fast response, ensuring the accuracy and consistency of the opening and closing action of the isolating switch 15.

[0025] refer to Figure 3The sealed enclosure 13 includes closed frames arranged side-by-side at intervals, forming the skeleton structure of the sealed enclosure 13. Visible panels 14 are sealed on both sides of the frames, and sealing plates are provided at the top and front and rear of the frames. A first sealing gasket 12 is provided in the area where the frames connect to the visible panels 14. Specifically, the closed frames are arranged longitudinally along the enclosure, forming the rigid skeleton structure of the sealed enclosure 13. Transparent visible panels 14 are sealed on the outer sides between adjacent frames to allow observation of the internal components from the outside. Sealing plates are fixedly installed at the top and front and rear ends of the frames. To ensure overall airtightness and dust and moisture protection, first sealing gaskets 12 are embedded or pressed into the contact area where the frame connects to the visible panel 14, and in the connection area between the frame and the sealing plate, to eliminate gaps in the rigid connection surfaces. The closed frame can be made of metal or high-strength insulating material, and an integrally cast mounting block is provided on the frame. The isolating stationary knife 16 and the moving knife base 11 are fixed to the mounting block for easy replacement and quick installation, enhancing insulation and sealing. The spacing between adjacent frames is set according to the movement stroke of the isolating knife switch 15 and the electrical safety clearance. The visible panel 14 is preferably made of a transparent insulating material (such as polycarbonate or tempered glass) with impact resistance, UV aging resistance, and flame retardant properties. The enclosure adopts a combined structure of "rigid spacer frame + multi-sided sealing plate + double-sided viewing panel 14". The closed frame ensures the overall strength and dimensional stability of the enclosure under mechanical impact and internal arc pressure. The double-sided viewing panels 14 allow direct observation of the internal switch opening and closing status and contact condition without opening the enclosure, greatly improving the convenience and safety of operation and maintenance inspection. At the same time, first sealing gaskets 12 are set on all joint surfaces of the frame, viewing panel 14 and sealing plate, which can effectively block the intrusion of external moisture, dust and corrosive gases, ensure the long-term stability of the internal insulation environment, thereby reducing the risk of flashover and malfunction caused by moisture or pollution, extending the service life of the equipment, and meeting the airtight protection requirements of high-voltage isolation equipment in outdoor or harsh working conditions.

[0026] refer to Figure 3A second sealing gasket 18 is provided in the area where the sealed housing 13 contacts the transmission module. Specifically, this area includes the periphery of the through hole through which the insulating pull rod 17 exits the sealed housing 13, the mounting flange surface where the sealed housing 13 and the transmission module housing meet, and the mechanical connection interface between the two. The second sealing gasket 18 can be made of an elastic, aging-resistant material (such as silicone rubber, fluororubber, or EPDM rubber), and its shape can be designed as an annular flat gasket, an O-ring, or a non-circular cross-section sealing strip to adapt to the sealing requirements of different contact interfaces. The second sealing gasket 18 is pressed and installed between the outer wall of the sealed housing 13 and the transmission module housing, and is arranged circumferentially around the movement channel or mounting interface of the insulating pull rod 17, thereby forming a continuous and uniform elastic sealing barrier in the combined dynamic and static sealing area. The second sealing gasket 18 can effectively block moisture, dust, salt spray and corrosive gases from the external environment from entering the sealed housing 13 through the interface gap, thereby avoiding the decline in internal insulation performance or component corrosion caused by leakage in the movement channel of the insulating rod 17. At the same time, the second sealing gasket 18, together with the visible panel 14 of the sealed housing 13 and the first sealing gasket 12 at the sealing plate, form a synergistic protection, establishing reliable airtight boundaries at the dynamic protrusion position of the insulating rod 17 and the static sealing position of the housing docking, significantly improving the protection level and long-term operational reliability of the whole machine in outdoor, humid or heavily polluted environments, and preventing problems such as flashover, malfunction or shortened service life caused by sealing failure.

[0027] refer to Figure 4The isolating switch 15 includes two current-carrying blades 155 arranged side by side with spacing, a first bolt 151 located at one end of the current-carrying blades 155 and passing through all the current-carrying blades 155, a blade head pressure plate 156 located at the other end of the current-carrying blades 155 and respectively located outside the two current-carrying blades 155, a second bolt for passing through the current-carrying blades 155 and the blade head pressure plate 156, a contact spring 157 sleeved on the second bolt, a cotter pin 154 located in the middle region of the current-carrying blades 155, and an adjusting threaded sleeve 153 located on the cotter pin 154 and a adjusting threaded sleeve 153 located on the adjusting threaded sleeve 153. The adjusting rod 158, used to connect the insulating pull rod 4417, the contact spring 157, and the adjusting rod 158 are all located in the area between the two current-carrying blades 155. The first bolt 151 is close to the moving blade base 11, and the second bolt is close to the isolating stationary blade 16. Specifically, the two current-carrying blades 155 are arranged side by side and spaced apart, forming the main conductive path of the switch. The first bolt 151 is located at one end of the current-carrying blade 155 (i.e., the end close to the moving blade base 11), and passes through the two current-carrying blades 155 in a direction perpendicular to the blade plane, for hinged installation of the blade end to the moving blade base. 11. The blade body is allowed to rotate around the axis of the first bolt 151; two blade head pressure plates 156 are respectively disposed on the outer side of the other end of the current-carrying blade body 155 (i.e., the end near the isolating stationary blade 16) to clamp the end structure; a second bolt passes through the two current-carrying blade bodies 155 and the two blade head pressure plates 156 to fix the blade head part into an integral structure; a contact spring 157 is sleeved on the second bolt and located in the area between the two current-carrying blade bodies 155, with its two ends abutting against the inner surface of the two current-carrying blade bodies 155 to provide outward pushing force on the blade body in the closed state. Elastic force, thereby pressing the contact pressure between the cutter head and the isolating stationary cutter 16; cotter pin 154, located in the middle region of the current-carrying cutter body 155, passing through both current-carrying cutter bodies 155; adjusting threaded sleeve 153, located on the cotter pin 154, which can rotate relative to the cotter pin 154 or be axially limited; adjusting rod 158, one end of which is connected to the adjusting threaded sleeve 153 (e.g., through threaded engagement), and the other end extends outward to connect to the insulating pull rod 17. By adjusting the relative position of the threaded sleeve 153 and the adjusting rod 158, the connection angle between the insulating pull rod 17 and the cutter body can be changed.The above features enable the direct transmission of the driving force of the insulating pull rod 17 to the center of the knife body, resulting in a more balanced force and smoother operation of the knife switch during opening and closing. This avoids the knife body swaying or jamming problems that are easily caused by traditional end-drive systems. Simultaneously, the contact spring 157 is built into the space between the two knife bodies and fitted onto the second bolt. This saves external space, making the overall width of the knife switch more compact, and evenly applies the knife head clamping force, ensuring a stable and reliable contact pressure between the knife head and the isolating stationary knife 16 during closing, reducing contact resistance and the risk of overheating. Furthermore, by adjusting the relative position of the threaded sleeve 153 and the adjusting rod 158, the effective length of the insulating pull rod 17 can be easily adjusted on-site to compensate for installation errors or long-term wear of the transmission chain, improving the accuracy and consistency of the knife switch's opening and closing position, thereby enhancing the overall assembly adaptability and long-term operational reliability.

[0028] refer to Figure 4 A cup-shaped washer 152 is provided at the contact point between the first bolt 151 and the outer side of the current-carrying knife body 155. It can utilize the disc-shaped elastic deformation characteristics to provide a long-term stable axial preload for the hinged end of the knife switch, effectively preventing bolt loosening and increased connection gap due to operating vibration, temperature changes or contact surface wear. At the same time, it evenly distributes the bolt clamping force on the outer surface of the knife body, avoiding local stress concentration and mechanical damage. This structure achieves multiple functions such as anti-loosening, buffering, gap compensation and contact pressure maintenance in a simple way, which significantly improves the connection reliability, operation stability and fatigue life of the hinged end of the isolating knife switch 15. It is especially suitable for high-voltage circuit breaker application scenarios in environments with frequent operation or strong vibration.

[0029] Referring to the figure, both the current-carrying knife body 155 and the isolating stationary knife 16 are made of chromium zirconium copper, and both surfaces are coated with a silver layer. This aims to achieve synergistic optimization of "high-strength substrate + high-conductivity surface layer": chromium zirconium copper provides sufficient mechanical strength, fatigue resistance, weld resistance, and arc erosion resistance, ensuring that the knife switch does not deform or fail prematurely under frequent operation and electro-stabilizing stress; the silver plating further reduces the contact resistance to an extremely low level, providing excellent oxidation resistance, corrosion resistance, and self-lubricating properties, reducing heat generation and wear, while the silver layer has a certain self-healing ability under slight arcing; the combination of the two enables the isolating knife switch 15 to maintain low resistance, low temperature rise, high reliability, and long electrical life during long-term operation, making it particularly suitable for circuit breaker applications with high rated current, frequent operation, or harsh environments.

[0030] refer to Figure 5The transmission module includes a transmission housing 47, an isolation spindle 41 housed within the transmission housing 47, a splitting / closing crank arm 42 mounted on the isolation spindle 41, a pull rod crank arm 43 connected to the splitting / closing crank arm 42, and a splitting / closing handle for connecting to and controlling the rotation of the isolation spindle 41. The pull rod crank arm 43 is hinged to the bottom end of the insulating pull rod 17. This transmission module integrates the isolation spindle 41, the splitting / closing crank arm 42, and the pull rod crank arm 43 into a closed linkage system through the transmission housing 47. The human-machine torque input by the splitting / closing handle drives the isolation spindle 41 to rotate. Through the two-stage motion conversion of the splitting / closing crank arm 42 and the pull rod crank arm 43, the rotary motion is converted into the linear reciprocating motion of the insulating pull rod 17, which ultimately drives the isolating switch 15 to complete the opening or closing action. The hinged design between the pull rod crank arm 43 and the bottom end of the insulating pull rod 17 achieves flexible motion transmission and avoids rigid interference. The overall structure achieves three-phase synchronous drive, reasonable matching of operating force and stroke, motion isolation and convenient manual operation. It has the technical effects of high transmission efficiency, reliable operation, simple maintenance and compliance with the "visible isolation break" safety standard. It is especially suitable for medium and high voltage switchgear that requires mechanical interlocking and manual isolation functions.

[0031] refer to Figure 5 It also includes a closing limit crank arm 48 for limiting the rotation angle of the lever crank arm 43. The closing limit crank arm 48 is added to the transmission module. By linking with the lever crank arm 43 and cooperating with the fixed stop in the transmission housing 47, the rotation angle of the lever crank arm 43 is strictly limited mechanically, thereby accurately controlling the extreme positions of the isolating switch 15 at the closing end and the opening end. This limit structure can effectively prevent the impact damage to the switch contacts, insulating lever 17 and hinge parts caused by over-extension of operation. At the same time, it provides the operator with a clear and definite tactile and audible signal of the position, avoiding safety accidents caused by misjudging the position of the switch. In addition, the closing limit crank arm 48 also provides a stable and reliable reference for auxiliary switch triggering, position indication and "five-proof" mechanical interlocking, so that the transmission module has multiple functions such as motion limitation, overload protection, operation feedback and safety interlocking, which significantly improves the operational safety, position repeatability accuracy and long-term operational reliability of the isolating switch 15.

[0032] refer to Figure 5It also includes a crossbeam 46 and a combined compression spring installed inside the transmission housing 47. One end of the combined compression spring is connected to the crossbeam 46, and the other end is connected to the opening / closing limit crank arm 48. The addition of the crossbeam 46 and the combined compression spring connected to the crossbeam 46 and the opening / closing limit crank arm 48 inside the transmission housing 47 enables the opening / closing limit crank arm 48 to have the dual functions of elastic buffering and energy storage release when it approaches the limit position: During the closing process, the combined compression spring releases the stored elastic potential energy to assist in the rapid movement of the drive lever crank arm 43 and the insulating lever 4417, thereby increasing the opening speed and shortening the arcing time; During the opening process, the combined compression spring is compressed to absorb excess kinetic energy, avoiding fatigue damage to the limit crank arm, stop and housing caused by rigid impact, while maintaining a stable elastic clamping force at the closing end point to compensate for contact wear and ensure contact reliability; In addition, the combined compression spring structure also reduces the peak operating force, improves the feel and prevents the disconnector from accidentally disengaging due to vibration. Overall, the introduction of the crossbeam 46 and the combined compression spring enables the transmission module to have multiple functions such as buffering and energy absorption, elastic limiting, auxiliary opening, contact pressure maintenance and vibration-resistant locking, which significantly improves the mechanical life, operational safety, contact reliability and adaptability to harsh environments of the isolating switch 15.

[0033] Furthermore, the top surface of the transmission housing 47 is provided with an interface hole for installing the current transformer module 2; this enables modular integrated installation of the circuit breaker body 3, the transmission module, and the current transformer. The interface hole not only provides a precise positioning reference and fastening connection point for the transformer, but also serves as a through hole for the lower conductive circuit to pass through the primary winding channel of the transformer, allowing the current transformer to be directly installed around the current-carrying conductor, avoiding the need for an additional transition busbar and the contact resistance and heat generation problems it introduces. At the same time, the interface hole effectively isolates the current transformer from the moving parts (main shaft, crank arm, compression spring, etc.) inside the transmission housing 47, preventing heat, dust, or lubricating oil from affecting each other. In addition, the standardized interface hole design allows the current transformer module 2 to be pluggable and replaceable, facilitating rapid on-site assembly, flexible selection, and maintenance. Overall, this structure significantly improves the overall compactness, assembly efficiency, electrical connection reliability, and maintenance convenience of the circuit breaker, while ensuring the sampling accuracy and phase-to-phase insulation performance of the current transformer.

[0034] The specific usage of this invention is as follows: During the closing process, the operator controls the isolation spindle 41 to rotate clockwise by controlling the opening and closing handle on the standardized circuit breaker body 3. The opening and closing crank arm 42 rotates clockwise simultaneously, the combined pressure spring component 45 resets and releases energy, and at the same time the pull rod crank arm 43 rotates clockwise, and the insulating pull rod 17 swings downward counterclockwise, pulling the isolating knife switch 15 to close, tightly inserting and conducting with the corresponding isolating stationary knife 16, completing the closing operation. At this time, the knife head pressure plate 156 and the contact pressure spring 157 maintain the squeezing state on the isolating knife blade to ensure the connection stability after closing.

[0035] During the tripping process, the operator controls the reverse action by controlling the opening and closing handle on the standardized circuit breaker body 3. The main shaft rotates counterclockwise, the opening and closing crank arm 42 rotates counterclockwise synchronously, the combined compression spring component 45 is compressed and stored, and at the same time the pull rod crank arm 43 rotates counterclockwise. The insulating pull rod 17 swings upward clockwise as a whole, pushing the isolating switch 15 to trip and disconnecting it from the corresponding isolating stationary switch 16 to achieve reliable isolation and complete the tripping operation.

[0036] During installation, the transmission components are assembled and placed inside the transmission sealing housing 13 before being sealed and welded. The combined current transformer module is installed from the top and fixed with screws. The insulating tie rod 17 is inserted from the top of the housing. The sealing housing 13 is placed on the upper part of the transmission sealing housing 13 through the bottom sealing gasket and fixed with screws. Then, the isolating switch 15 is assembled into a whole, and the visible panel 14 is sealed to realize component assembly and improve installation efficiency.

[0037] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A circuit breaker, characterized in that, The device includes a circuit breaker body, a current transformer module and a transmission module disposed on the same side of the circuit breaker, and a disconnector module disposed on the transmission module. The disconnector module includes a visible sealed housing, a moving knife base and an isolating stationary knife disposed in the sealed housing, an isolating disconnector connected to the moving knife base and the isolating stationary knife at both ends respectively, and an insulating pull rod connected at one end to the isolating disconnector and extending out of the sealed housing and connected to the transmission module at the other end.

2. The circuit breaker according to claim 1, characterized in that, The sealed enclosure includes closed frames arranged side by side at intervals, the frames forming the skeleton structure of the sealed enclosure. Visible panels are sealed on both sides of the frames, and sealing plates are provided on the top and front and rear of the frames. A first sealing gasket is provided in the area where the frames connect with the visible panels.

3. The circuit breaker according to claim 1, characterized in that, A second sealing gasket is provided in the area where the sealed housing contacts the transmission module.

4. The circuit breaker according to claim 1, characterized in that, The isolating switch includes two current-carrying blades arranged side-by-side and spaced apart, a first bolt disposed at one end of each current-carrying blade and passing through all the current-carrying blades, a blade head pressure plate disposed at the other end of each current-carrying blade and located on the outer side of each of the two current-carrying blades, a second bolt for passing through the current-carrying blade and the blade head pressure plate, a contact spring sleeved on the second bolt, a cotter pin disposed in the middle region of the current-carrying blade, an adjusting threaded sleeve disposed on the cotter pin, and an adjusting rod disposed on the adjusting threaded sleeve for connecting the insulating pull rod. The contact spring and the adjusting rod are both located in the region between the two current-carrying blades. The first bolt is close to the moving blade base, and the second bolt is close to the isolating stationary blade.

5. The circuit breaker according to claim 4, characterized in that, A cup-shaped washer is provided at the contact point between the first bolt and the outer side of the flow-carrying blade body.

6. The circuit breaker according to claim 4, characterized in that, Both the current-carrying blade and the isolating stationary blade are made of chromium zirconium copper material, and both have a silver plating layer on their surfaces.

7. The circuit breaker according to claim 1, characterized in that, The transmission module includes a transmission housing, an isolation spindle disposed within the transmission housing, a splitting crank arm disposed on the isolation spindle, a pull rod crank arm connected to the splitting crank arm, and a splitting handle for connecting to the isolation spindle and for controlling the rotation of the isolation spindle. The pull rod crank arm is hinged to the bottom end of the insulating pull rod.

8. The circuit breaker according to claim 7, characterized in that, It also includes a split-opening limit arm for limiting the rotation angle of the lever arm.

9. The circuit breaker according to claim 8, characterized in that, It also includes a crossbeam and a combined compression spring disposed in the transmission housing, one end of the combined compression spring being connected to the crossbeam and the other end being connected to the opening and closing limiting crank arm.

10. The circuit breaker according to claim 7, characterized in that, The top surface of the transmission housing is provided with an interface hole for installing the current transformer module.

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