A pole-mounted circuit breaker in a coastal high-salt-mist environment

Abstract

The application relates to a pole-mounted circuit breaker in a coastal high-salt-mist environment, and belongs to the technical field of power equipment, which comprises a shell and an operating mechanism, the shell comprises a circuit breaker box and a mechanism cover, a solid-sealed pole is arranged in the circuit breaker box, a corrugated pipe is further connected between the bottom end of an insulating pull rod in the solid-sealed pole and an epoxy resin layer wrapped outside the insulating pull rod; the operating mechanism is installed in the mechanism cover, and the inside of the circuit breaker box and the inside of the mechanism cover are both filled with anti-erosion insulating medium; the anti-erosion insulating medium filled in the inside of the circuit breaker box is a combination of dry air and natural ester lubricating oil or is only dry air. The application has the advantages of good sealing performance, strong salt-mist resistance, stable operation environment and high reliable action of the switch, and the sealing performance is good, the sealing structure design of the corrugated pipe of the solid-sealed pole, the oil-immersed protection of the operating mechanism, the anti-erosion insulating medium filling of the circuit breaker box, the multi-layer composite insulation of the bushing and the long creepage distance design.

Description

Technical Field

[0001] This invention relates to a pole-mounted circuit breaker for coastal high-salt-fog environments, belonging to the field of power equipment technology. Background Technology

[0002] Coastal areas have high humidity levels, which frequently causes equipment malfunctions due to flashover, condensation, and corrosion. Furthermore, the high salt content in the air causes severe corrosion to the metal components of pole-mounted switches, especially post-mounted circuit breakers. Prolonged exposure to salt spray can lead to rust and corrosion of the switch's casing, terminals, and operating mechanisms, reducing mechanical strength and electrical performance. Salt spray also corrodes insulation materials, lowering their insulation properties. Insulating components such as insulators and bushings may experience decreased insulation resistance and partial discharge due to salt spray corrosion, increasing the risk of leakage and short circuits.

[0003] Due to the aforementioned environmental factors, the reliability of pole-mounted switches in coastal areas is significantly lower than in other regions. Switches are prone to malfunctions such as failure to operate, accidental operation, and incomplete opening and closing. These malfunctions not only affect the normal power supply of the power system but may also lead to large-scale power outages, causing severe economic losses to users. Furthermore, the maintenance costs of pole-mounted switches in coastal areas are also higher. Due to the harsh environment, the equipment is easily damaged, requiring more frequent maintenance and replacement. These maintenance efforts not only increase the investment of manpower, material resources, and financial resources but may also affect the normal operation of the power system. Therefore, improvements are urgently needed. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention designs a pole-mounted circuit breaker for coastal high salt spray environments. It has good sealing performance and strong salt spray resistance, ensuring the stability of the operating environment and contributing to the high reliability of the switch operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A pole-mounted circuit breaker for coastal high salt spray environment includes a housing and an operating mechanism. The housing includes a circuit breaker box, and a solid-sealed pole is provided inside the circuit breaker box. The operating mechanism drives the solid-sealed pole to open and close the circuit through a transmission component installed at the bottom of the circuit breaker box. Bushings electrically connected to the solid-sealed pole are sealed on both the left and right sides of the circuit breaker box. The solid-sealed pole includes a vacuum interrupter, an inlet connecting rod installed at the top of the vacuum interrupter, and an insulating pull rod movably installed at the bottom of the vacuum interrupter. The insulating pull rod is covered with an epoxy resin layer, and an outlet connecting rod is also installed inside the epoxy resin layer. A flexible connection is connected between the inner end of the outlet connecting rod and the top of the insulating pull rod. A retractable corrugated tube is also connected between the bottom of the insulating pull rod and the epoxy resin layer. When closing the circuit, the insulating pull rod drives the flexible connection to move vertically upward to achieve closing. When opening the circuit, the insulating pull rod drives the flexible connection to move vertically downward to achieve opening.

[0006] Furthermore, the housing also includes a mechanism cover sealed and installed at the front end of the circuit breaker enclosure, the operating mechanism is installed inside the mechanism cover, and both the inside of the circuit breaker enclosure and the inside of the mechanism cover are filled with an anti-corrosion insulating medium; the anti-corrosion insulating medium filled inside the circuit breaker enclosure is a combination of dry air and natural ester lubricating oil or only dry air.

[0007] Furthermore, the epoxy resin layer includes an inner insulating skirt and an outer insulating skirt that are sequentially wrapped from the inside out.

[0008] Furthermore, the operating mechanism includes a closing operation module for performing closing operations and a opening operation module for performing opening operations. Both the closing operation module and the opening operation module include a trigger module. The trigger module includes a trigger coil, a trigger half shaft, and a trigger spring rod. When the trigger coil receives a pulse current, the trigger spring rod is released, thereby pushing the trigger half shaft to move to achieve closing or opening. The operating mechanism also includes a triangular rotating plate for driving the trigger half-shaft to reset.

[0009] Furthermore, the sleeve includes a conductive rod, the conductive rod is covered with an epoxy resin sleeve, the epoxy resin sleeve is further covered with silicone rubber, and multiple creepage skirts with a creepage length of not less than 700 mm are uniformly spaced on the outside of the epoxy resin sleeve; a voltage sensor is also electrically connected to the conductive rod.

[0010] Furthermore, a current transformer is installed inside the circuit breaker housing, and both the inlet and outlet ends of the solid-sealed pole are equipped with current transformers, with the bushing passing through the current transformer.

[0011] Furthermore, the transmission assembly includes a mounting plate, a spindle crank arm, and a transmission spindle. The solidified pole is mounted on the mounting plate, the spindle crank arm is sleeved on the transmission spindle and connected to the insulating pull rod through a transmission pin, and the transmission spindle is connected to the trigger module in a transmission connection.

[0012] Furthermore, a movable frame is installed at the bottom of the circuit breaker enclosure, and a rear sealing plate is provided at the rear end of the circuit breaker enclosure. The rear sealing plate is provided with an explosion-proof component for releasing high-pressure gas when a short circuit fault occurs in the circuit breaker enclosure, and an air filling valve for filling the circuit breaker enclosure with dry air is also provided on the rear sealing plate.

[0013] Furthermore, O-rings are provided between the circuit breaker housing and the mechanism cover, as well as between the circuit breaker housing and the rear sealing plate; the mechanism cover is filled with natural ester lubricating oil, and an oil level gauge is installed on the top of the mechanism cover.

[0014] Furthermore, the bottom of the circuit breaker housing is provided with multiple first reinforcing ribs, the inside of the circuit breaker housing is provided with multiple second reinforcing ribs, and a reinforcing plate is also installed at the connection between the circuit breaker housing and the bushing.

[0015] Compared with the prior art, the present invention has the following features and beneficial effects: This invention achieves long-term reliable operation in harsh coastal environments with high salt spray by employing a corrugated pipe sealing structure for the solidified pole, a double-layer umbrella skirt design with epoxy resin layer, oil-immersion protection for the operating mechanism, dry air filling for the circuit breaker enclosure, multi-layer composite insulation and long creepage distance design for the bushing, configuration of current transformers at both ends of the incoming / outgoing lines, and safety protection of explosion-proof components. It features excellent sealing performance, strong corrosion resistance, high insulation reliability, and comprehensive protection functions. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a top view of the structure of the present invention.

[0018] Figure 3 This is a rear view structural schematic diagram of the present invention.

[0019] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker housing of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the circuit breaker housing of the present invention.

[0021] Figure 6 This is a cross-sectional schematic diagram of the solid-sealed pole of the present invention without the installation of a bellows.

[0022] Figure 7 This is a schematic cross-sectional view of the solid-sealed pole with a bellows installed according to the present invention.

[0023] Figure 8 This is a schematic diagram of the installation structure of the operating mechanism of the present invention.

[0024] Figure 9 This refers to the relative position of the closing coil and the triangular plate in the open state of the operating mechanism in this embodiment of the invention.

[0025] Figure 10 It refers to the relative position of the closing coil of the operating mechanism after it is energized and popped out in the embodiment of the present invention.

[0026] Figure 11 It refers to the relative position of the triangular plate striking the closing coil during the circuit breaker closing process in this embodiment of the invention.

[0027] Figure 12 This refers to the relative position of the closing coil and the triangular plate when the operating mechanism is in the closed state in this embodiment of the invention.

[0028] Figure 13 This is a cross-sectional view of the sleeve of the present invention.

[0029] Figure 14 This is an installation diagram of the transmission component and the solidified pole of the present invention.

[0030] The attached figures are labeled as follows: 1. Housing; 2. Solid sealing pole; 201. Vacuum interrupter; 202. Inlet connecting rod; 203. Outlet connecting rod; 204. Flexible connection; 205. Insulating pull rod; 206. Epoxy resin layer; 207. Bellows; 208. Outer insulating skirt; 209. Inner insulating skirt; 3. Transmission assembly; 301. Mounting plate; 302. Main shaft crank arm; 303. Transmission main shaft; 304. Transmission pin; 4. Operating mechanism; 401. Closing coil; 402. Opening coil; 403. Speed-up spring rod; 404. Triangular rotating plate; 405. Closing half-circuit. Shaft; 406, Return spring; 5, Sleeve; 501, Conductive rod; 502, Epoxy resin sleeve; 503, Silicone rubber; 504, Voltage sensor; 505, Creeping umbrella skirt; 6, Moving frame; 7, Explosion-proof assembly; 8, Oil level gauge; 9, Circuit breaker housing; 901, First reinforcing rib; 902, Second reinforcing rib; 903, Reinforcing plate; 904, Sleeve stud; 905, Mounting hole; 907, Welding plate; 908, Connecting stud one; 909, Mounting nut; 910, Connecting stud two; 10, Mechanism cover; 11, Rear sealing plate; 12, Inflation valve; 13, Current transformer. Detailed Implementation

[0031] The present invention will now be described in more detail with reference to the embodiments.

[0032] Example 1 Please see Figures 1 to 7 The pole-mounted circuit breaker in this embodiment, designed for coastal high-salt-fog environments, includes a housing 1 and an operating mechanism 4.

[0033] The housing 1 includes a circuit breaker enclosure 9, inside which a solid-sealed pole 2 is installed. The operating mechanism 4 drives the solid-sealed pole 2 to open and close the circuit breaker through a transmission component 3 installed at the bottom of the circuit breaker enclosure 9. Both sides of the circuit breaker enclosure 9 are sealed with bushings 5 ​​that are electrically connected to the solid-sealed pole 2.

[0034] In this embodiment, please refer to Figure 2 and Figure 4 There are three solid-sealed poles 2 and six bushings 5.

[0035] Specifically, the solid-sealed pole 2 includes a vacuum interrupter 201, an inlet connecting rod 202 installed at the top of the vacuum interrupter 201, and an insulating pull rod 205 movably disposed at the bottom of the vacuum interrupter 201. The insulating pull rod 205 is covered with an epoxy resin layer 206. In this embodiment, the epoxy resin layer 206 includes an inner insulating skirt 209 and an outer insulating skirt 208 that are sequentially covered from the inside to the outside. Through the double-layer epoxy resin coating, the salt spray resistance is significantly improved, making it suitable for coastal high salt spray environments.

[0036] Inside the epoxy resin layer 206, there is also an outgoing line connecting rod 203. The inner end of the outgoing line connecting rod 203 is connected to the top of the insulating pull rod 205 by a flexible connection 204. The bottom end of the insulating pull rod 205 is connected to the epoxy resin layer 206 by a retractable corrugated tube 207. When closing the circuit, the insulating pull rod 205 drives the flexible connection 204 to move vertically upward to achieve closing the circuit. When opening the circuit, the insulating pull rod 205 drives the flexible connection 204 to move vertically downward to achieve opening the circuit.

[0037] As can be seen from the above description, the bellows 207 can extend and retract during the movement of the insulating rod 205, ensuring the flexibility of movement while maintaining the sealing performance and preventing salt spray from penetrating the interior of the epoxy resin layer 206. The flexible connection 204 moves upward when closing to achieve closing and quickly moves downward when opening to achieve opening, which can ensure the reliability and response speed of circuit switching. At the same time, the sealed bushing 5 and the circuit breaker housing 9 further enhance the overall protection performance of the equipment in harsh environments.

[0038] Furthermore, the housing 1 also includes a mechanism cover 10 sealed and installed at the front end of the circuit breaker enclosure 9, the operating mechanism 4 is installed inside the mechanism cover 10, and both the inside of the circuit breaker enclosure 9 and the inside of the mechanism cover 10 are filled with an anti-corrosion insulating medium.

[0039] In this embodiment, the mechanism cover 10 is filled with natural ester lubricating oil, and an oil level gauge 8 is installed at the top of the mechanism cover 10. Natural ester lubricating oil has a high environmental protection flash point, and it can submerge the entire operating mechanism 4 to prevent salt spray corrosion. The oil level of natural ester lubricating oil can be monitored in real time by the oil level gauge 8.

[0040] The circuit breaker enclosure 9 is filled with dry air at an absolute pressure of 1.2 bar, which not only provides a reliable insulation environment but also effectively prevents external humid salt spray air from entering the enclosure, further enhancing its corrosion resistance.

[0041] Further, please refer to Figures 8 to 12 The operating mechanism 4 includes a closing operation module for performing closing operations and a opening operation module for performing opening operations.

[0042] Both the closing operation module and the opening operation module include a trigger module. The trigger module includes a trigger coil, a trigger half shaft, and a trigger spring rod. When the trigger coil receives a pulse current, the trigger spring rod is released, thereby pushing the trigger half shaft to move to achieve closing or opening.

[0043] The trigger coil in the closing operation module is a closing coil 401 with a built-in permanent magnet, and the trigger coil in the opening operation module is an opening coil 402 with a built-in permanent magnet. Both the closing coil 401 and the opening coil 402 are oil-immersed low-power fast-response coils.

[0044] The operating mechanism 4 also includes a triangular rotating plate 404 for driving the trigger half shaft to reset.

[0045] In this embodiment, taking the closing process as an example, the trigger half-shaft is the closing half-shaft 405, and the trigger spring rod is the speed-up compression spring rod 403. Specifically, when the switch is in the open state (see [reference]...), Figure 9 The closing coil 401 receives a closing pulse current from the FTU controller. The magnetic field generated by the closing coil 401 cancels the attraction of the permanent magnet built into the closing coil 401, and the speed-up spring rod 403 is instantly released from the compressed state, pushing the closing half-shaft 405 to rotate. The specific action is as follows: Figure 10 As shown.

[0046] The closing half-shaft 405 is indirectly connected to the transmission assembly 3 through various transmission stages. When the closing half-shaft 405 is in position, the circuit breaker performs the closing action, and finally drives the insulating pull rod 205 and the flexible connection 204 to move upward through the transmission assembly 3, and the vacuum interrupter 201 closes.

[0047] During the closing operation, the triangular rotating plate 404 is simultaneously rotated counterclockwise. The high-speed rotating triangular rotating plate 404 strikes the right end of the speed-up spring rod 403, such as... Figure 11 As shown.

[0048] The rotation of the triangular rotating plate 404 is driven by the power component inside the mechanism cover 10. This is an existing mechanism, and its principle will not be elaborated further.

[0049] Finally, the acceleration spring rod 403 continues to be compressed, and returns to its initial position, as shown. Figure 12 As shown.

[0050] The closing half-shaft 405 returns to its initial position under the action of the reset spring 406 installed inside the mechanism cover 10.

[0051] Further, please refer to Figure 14 The transmission assembly 3 includes a mounting plate 301, a spindle crank arm 302, and a transmission spindle 303. The fixed electrode post 2 is mounted on the mounting plate 301 of the transmission assembly 3. The spindle crank arm 302 is sleeved on the transmission spindle 303 and connected to the insulating pull rod 205 through the transmission pin 304. The mounting plate 301 is fixedly mounted inside the bottom of the circuit breaker housing 9. The spindle crank arm 302 and the transmission spindle 303 are both located inside the mounting plate 301, and the transmission spindle 303 is connected to the trigger module.

[0052] Furthermore, the sleeve 5 includes a conductive rod 501, which is covered with an epoxy resin sleeve 502. The epoxy resin sleeve 502 is also covered with silicone rubber 503. Both epoxy resin and silicone rubber 503 are corrosion-resistant materials and are tightly bonded to the conductive rod 501, which can prevent salt spray from penetrating along the interface and significantly extend the service life of the sleeve 5.

[0053] The epoxy resin sleeve 502 is uniformly spaced with multiple creepage skirts 505 with a creepage length of not less than 700mm. In harsh environments such as salt spray, the long creepage distance effectively suppresses surface leakage current, reduces the risk of flashover, and can further ensure the safe operation of the circuit breaker in high salt spray areas.

[0054] A voltage sensor 504 is also electrically connected to the conductive rod 501. The voltage sensor 504 can directly collect voltage signals without the need for an additional voltage transformer.

[0055] In this embodiment, the sleeve 5 includes two types: straight sleeve and bent sleeve. Please refer to [link / reference]. Figure 13 , Figure 13 This is a cross-sectional view of the bent sleeve.

[0056] Furthermore, a current transformer 13 is installed inside the circuit breaker housing 9, and both the inlet and outlet ends of the solid-sealed pole 2 are equipped with current transformers 13. The bushing 5 passes through the current transformer 13. The current transformer 13 is installed at both the inlet and outlet ends of the solid-sealed pole 2, which can collect the current signals on both sides of the circuit breaker in real time. In this embodiment, the current transformer 13 can be a phase current transformer or a zero-sequence current transformer.

[0057] Furthermore, a movable frame 6 is installed at the bottom of the circuit breaker housing 9 for easy handling and relocation.

[0058] The rear end of the circuit breaker enclosure 9 is provided with a rear sealing plate 11. The rear sealing plate 11 is provided with an explosion-proof component 7 for releasing high-pressure gas when a short circuit fault occurs in the circuit breaker enclosure 9. The rear sealing plate 11 is also provided with an air filling valve 12 for filling the circuit breaker enclosure 9 with dry air.

[0059] Furthermore, O-rings are provided between the circuit breaker housing 9 and the mechanism cover 10, as well as between the circuit breaker housing 9 and the rear sealing plate 11, achieving an IP67 protection level.

[0060] Furthermore, the bottom of the circuit breaker housing 9 is provided with multiple first reinforcing ribs 901, the inside of the circuit breaker housing 9 is provided with multiple second reinforcing ribs 902, and a reinforcing plate 903 is also installed at the connection between the circuit breaker housing 9 and the bushing 5.

[0061] Please see Figure 5 The circuit breaker housing 9 has mounting holes 905, and the reinforcing plate 903 is installed inside the mounting holes 905.

[0062] Several mounting nuts 909 for mounting current transformers 13 are installed at the bottom of the inside of the circuit breaker housing 9.

[0063] Several bushing studs 904 for installing bushings 5 ​​are installed on the outside of the circuit breaker housing 9.

[0064] The rear side of the circuit breaker housing 9 is a hollow welding plate 907, which is welded to the circuit breaker housing 9. A ring of connecting studs 908 is provided on the welding plate 907 for installing the rear sealing plate 11.

[0065] The front end of the circuit breaker housing 9 is equipped with several connecting studs 910 for mounting the mechanism cover 10.

[0066] Example 2 The rest is the same as in Embodiment 1, except that in this embodiment, in addition to filling the circuit breaker housing 9 with dry air, a small amount of natural ester lubricating oil is added. The amount of natural ester lubricating oil is so high that it completely covers the mounting plate 301 of the transmission assembly 3 to ensure that the transmission assembly 3 is protected from salt spray corrosion.

[0067] The working principle of this invention is as follows: When the system issues a closing command, the closing coil 401 in the operating mechanism 4 receives a pulse current. The magnetic field generated by the closing coil 401 cancels the attraction of its built-in permanent magnet, and the speed-up spring rod 403, which is in a compressed state, is released instantly, pushing the closing half-shaft 405 to rotate. The closing half-shaft 405 is connected to the transmission component 3. When the closing half-shaft 405 rotates to the position, it drives the solid-sealed pole 2 to perform the closing action through the transmission component 3.

[0068] Specifically, the transmission spindle 303 drives the spindle crank arm 302 to move, and the spindle crank arm 302 pushes the insulating pull rod 205 to move upward. The top of the insulating pull rod 205 connects the inlet connecting guide rod 202 and the outlet connecting guide rod 203 through the flexible connection 204, thereby realizing the circuit connection.

[0069] At the same time, the bellows 207 between the bottom end of the insulating rod 205 and the epoxy resin layer 206 is compressed, but due to its expandable metal sealing structure, while allowing the insulating rod 205 to move, it still maintains the absolute seal of the main circuit air chamber inside the epoxy resin layer 206, preventing external salt spray gas from entering.

[0070] During the closing operation, the operating mechanism 4 simultaneously drives the triangular rotating plate 404 to rotate counterclockwise at high speed. The rotating triangular rotating plate 404 strikes the right end of the speed-up spring rod 403, causing the speed-up spring rod 403 to be compressed and return to its initial position, preparing for the next operation.

[0071] When the system issues a trip command or detects a fault, the trip coil 402 receives a pulse current, thereby disconnecting the circuit. During the tripping process, the bellows 207 is stretched but maintains its sealing function. At the same time, the triangular rotating plate 404 rotates in the opposite direction, striking the end of the trip coil 402, causing the speed-up spring rod 403 on the tripping side to reset.

[0072] The operating mechanism 4 is an oil-immersed low-power fast-response mechanism. The closing coil 401 and the opening coil 402 inside are completely submerged in the natural ester lubricating oil inside the mechanism cover 10. The natural ester lubricating oil not only plays a role in insulation and lubrication, but more importantly, it physically isolates the operating mechanism 4 from the external salt spray environment to prevent the precision mechanical parts from being corroded.

[0073] The oil level gauge 8 on the top of the mechanism cover 10 can monitor the oil level in real time, ensuring that the operating mechanism 4 is always in a good oil immersion protection state. The circuit breaker enclosure 9 is filled with dry air at an absolute pressure of 1.2 bar. The dry air not only provides a reliable insulation environment, but also effectively prevents external humid salt spray air from entering the enclosure, further improving the corrosion resistance.

[0074] When a serious fault causes a sharp increase in pressure inside the circuit breaker enclosure 9, the explosion-proof component 7 installed on the rear sealing plate 11 activates, releasing high-pressure gas in a directional manner to prevent the circuit breaker enclosure 9 from exploding or rupturing, thus protecting personnel and surrounding equipment. After the fault is cleared, dry air can be refilled into the circuit breaker enclosure 9 through the inflation valve 12 to restore the insulation and protective performance of the equipment.

[0075] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A pole-mounted circuit breaker for coastal high-salt-fog environments, characterized in that: The circuit breaker includes a housing (1) and an operating mechanism (4). The housing (1) includes a circuit breaker enclosure (9). A solid-sealed pole (2) is installed inside the circuit breaker enclosure (9). The operating mechanism (4) drives the solid-sealed pole (2) to open and close the circuit breaker through a transmission assembly (3) installed at the bottom of the circuit breaker enclosure (9). Both sides of the circuit breaker enclosure (9) are sealed with bushings (5) that are electrically connected to the solid-sealed pole (2). The solid-sealed pole (2) includes a vacuum interrupter (201), an inlet connecting rod (202) installed at the top of the vacuum interrupter (201), and an insulating pull rod (205) movably installed at the bottom of the vacuum interrupter (201). The insulating pull rod (205) is covered with an epoxy resin layer (206). An outlet connecting rod (203) is also provided inside the epoxy resin layer (206). A flexible connection (204) is connected between the inner end of the outlet connecting rod (203) and the top of the insulating pull rod (205). A retractable corrugated pipe (207) is also connected between the bottom end of the insulating pull rod (205) and the epoxy resin layer (206). When closing the circuit, the insulating pull rod (205) drives the flexible connection (204) to move vertically upward to achieve closing. When opening the circuit, the insulating pull rod (205) drives the flexible connection (204) to move vertically downward to achieve opening.

2. The pole-mounted circuit breaker for coastal high-salt-fog environments according to claim 1, characterized in that: The housing (1) also includes a mechanism cover (10) sealed and installed at the front end of the circuit breaker housing (9). The operating mechanism (4) is installed inside the mechanism cover (10), and both the inside of the circuit breaker housing (9) and the inside of the mechanism cover (10) are filled with an anti-corrosion insulating medium. The anti-corrosion insulating medium filled inside the circuit breaker housing (9) is a combination of dry air and natural ester lubricating oil or only dry air.

3. A pole-mounted circuit breaker for coastal high-salt-spray environments according to claim 1, characterized in that: The epoxy resin layer (206) includes an inner insulating skirt (209) and an outer insulating skirt (208) that are sequentially wrapped from the inside to the outside.

4. A pole-mounted circuit breaker for coastal high-salt-fog environments according to claim 1, characterized in that: The operating mechanism (4) includes a closing operation module for performing closing operations and a opening operation module for performing opening operations. Both the closing operation module and the opening operation module include a trigger module. The trigger module includes a trigger coil, a trigger half shaft, and a trigger spring rod. When the trigger coil receives a pulse current, the trigger spring rod is released, thereby pushing the trigger half shaft to move to achieve closing or opening. The operating mechanism (4) also includes a triangular rotating plate (404) for driving the trigger half shaft to reset.

5. A pole-mounted circuit breaker for coastal high-salt-spray environments according to claim 1, characterized in that: The sleeve (5) includes a conductive rod (501), the conductive rod (501) is covered with an epoxy resin sleeve (502), the epoxy resin sleeve (502) is also covered with silicone rubber (503), and multiple creepage umbrella skirts (505) with a creepage length of not less than 700 mm are uniformly spaced on the outside of the epoxy resin sleeve (502); a voltage sensor (504) is also electrically connected to the conductive rod (501).

6. A pole-mounted circuit breaker for coastal high-salt-fog environments according to claim 5, characterized in that: The circuit breaker housing (9) is also equipped with a current transformer (13), and the inlet and outlet ends of the solid-sealed pole (2) are both equipped with current transformers (13), and the bushing (5) passes through the current transformer (13).

7. A pole-mounted circuit breaker for coastal high-salt-fog environments according to claim 4, characterized in that: The transmission assembly (3) includes a mounting plate (301), a spindle crank arm (302), and a transmission spindle (303). The solid-sealed pole (2) is mounted on the mounting plate (301), the spindle crank arm (302) is sleeved on the transmission spindle (303) and connected to the insulating pull rod (205) through a transmission pin (304). The transmission spindle (303) is connected to the trigger module.

8. A pole-mounted circuit breaker for coastal high-salt-spray environments according to claim 1, characterized in that: A movable frame (6) is installed at the bottom of the circuit breaker housing (9). A rear sealing plate (11) is provided at the rear end of the circuit breaker housing (9). An explosion-proof component (7) for releasing high-pressure gas when a short circuit fault occurs in the circuit breaker housing (9) is provided on the rear sealing plate (11). An air filling valve (12) for filling dry air into the circuit breaker housing (9) is also provided on the rear sealing plate (11).

9. A pole-mounted circuit breaker for coastal high-salt-fog environments according to claim 1, characterized in that: O-rings are provided between the circuit breaker housing (9) and the mechanism cover (10) and between the circuit breaker housing (9) and the rear sealing plate (11); the mechanism cover (10) is filled with natural ester lubricating oil and an oil level gauge (8) is installed on the top of the mechanism cover (10).

10. A pole-mounted circuit breaker for coastal high-salt-fog environments according to claim 1, characterized in that: The bottom of the circuit breaker housing (9) is provided with multiple first reinforcing ribs (901), and the inside of the circuit breaker housing (9) is provided with multiple second reinforcing ribs (902). A reinforcing plate (903) is also installed at the connection between the circuit breaker housing (9) and the bushing (5).

Images