Outdoor high-voltage current-limiting fuse

Abstract

The application belongs to the technical field of fuses, in particular to an outdoor high-voltage current-limiting fuse, comprising an epoxy tube; the upper and lower ends of the epoxy tube are respectively sleeved with an upper locking ring and a lower locking ring, a static contact is arranged on the upper locking ring, the static contact is installed below an anti-icing cover through bolts, and a first spring is installed on the static contact; in the application, a striker is independently arranged in a support column, a trigger branch and a main fuse passage are separated in structure, assembly complexity and interference risk in operation caused by passing of a constantan wire through a hole in the support column in traditional design are avoided; meanwhile, a connecting cavity and a plug-in connector structure are arranged in a connecting piece at the lower end, and a connecting wire in a rotating seat is matched, stable electrical leading-out is realized, and through a rotatable connecting frame design, the fuse is allowed to flexibly adjust an installation angle according to the direction of incoming and outgoing lines on site, and construction and maintenance in a complex outdoor environment are greatly facilitated.

Description

Technical Field

[0001] This invention belongs to the field of fuse technology, specifically an outdoor high-voltage current-limiting fuse. Background Technology

[0002] Outdoor high-voltage current-limiting fuses are key components in power systems used to protect equipment such as transformers, capacitor banks, and motors from overload and short-circuit current damage. When a short-circuit fault occurs in the power system, the fuse interrupts the fault current by melting its fusible element, thereby protecting electrical equipment from damage. As power grid construction extends into outdoor environments, higher requirements are placed on the structural reliability, installation adaptability, and functional stability of outdoor high-voltage current-limiting fuses.

[0003] Existing outdoor high-voltage current-limiting fuses typically use epoxy tubes as the insulation body, with a support column inside the tube. The fusible element is wound around the support column, and both ends of the epoxy tube are sealed with metal end caps, which also serve as electrical connection terminals.

[0004] However, existing fuses primarily rely on the heat generated by overload or short-circuit currents to melt the fusible element. But when the fault current approaches the minimum melting current threshold, or when the fusible element undergoes aging and metallographic changes due to repeated current surges, it may fail to melt quickly and cleanly within a preset time. This is especially true in outdoor environments with large temperature differences and frequent thermal expansion and contraction of the fusible element, where the contact state between the fusible element and the filling medium (such as silica sand) changes, leading to a decrease in arc-extinguishing capability. Once the fusible element adheres and fails to completely disconnect, the fault current cannot be effectively interrupted, the fault point will persist, and the power outage area will expand, potentially even burning out upstream switchgear, seriously threatening the operational safety of the power system. Therefore, it is necessary to design an outdoor high-voltage current-limiting fuse to solve these problems. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes an outdoor high-voltage current-limiting fuse. This invention primarily addresses the problem that existing fuses may not completely fuse, thus affecting the safety of the power system.

[0006] The technical solution adopted by this invention to solve its technical problem is: an outdoor high-voltage current-limiting fuse, including an epoxy tube; an upper locking ring and a lower locking ring are respectively sleeved at the upper and lower ends of the epoxy tube; a stationary contact piece is provided on the upper locking ring; the stationary contact piece is bolted to the underside of an anti-icing cover; a first spring is installed on the stationary contact piece; the other end of the first spring is installed under the anti-icing cover; an upper mounting steel foot is installed on the side of the anti-icing cover; a support plate is bolted to the underside of the anti-icing cover; a hook is installed on the side of the support plate; the hook is located on the outer surface of the epoxy tube; a rotating seat is hinged to the side of the lower locking ring; the rotating seat is rotatably connected to a connecting frame; the connecting... The mounting bolts are installed on the lower mounting steel feet. The upper and lower mounting steel feet are respectively installed on the upper and lower ends of the insulating porcelain bottle. The bottom end of the epoxy tube is equipped with a lower outer cap, and the top end of the epoxy tube is equipped with an upper outer cap. A first connecting sleeve is provided under the upper outer cap, and a second connecting sleeve is provided on the lower outer cap. A molten material is connected between the first and second connecting sleeves. A support column is installed between the first and second connecting sleeves. An impactor is provided inside the support column. A connector is provided inside the lower locking ring. A connecting cavity is opened inside the connector. A plug is provided inside the connecting cavity. A connecting wire is connected to the plug. The connecting wire is installed inside the rotating seat.

[0007] As a further description of the above technical solution: the impactor includes a guide sleeve installed inside the support column. The guide sleeve is a cylindrical structure with an open bottom end. The open bottom end of the guide sleeve passes through the lower outer cap and communicates with the connecting cavity. A limiting ring is provided inside the guide sleeve. A striking pin is provided on the inner wall of the limiting ring. The striking pin is a cylindrical structure with an open top end. A brass pad is installed inside the striking pin. A second spring is installed on the brass pad. The top end of the second spring is fixedly connected to the inner top wall of the guide sleeve. A connecting insulating sleeve is installed on the guide sleeve. A fusible wire is installed on the brass pad. The top end of the fusible wire passes through the connecting insulating sleeve and is connected to a copper tube. The copper tube is installed on the connecting insulating sleeve. A copper wire is installed at the top end of the copper tube. The top end of the copper wire is installed under the upper outer cap.

[0008] As a further description of the above technical solution: the fuse wire is a steel wire with a diameter of 0.2mm-0.3mm, and the copper wire has a diameter of 0.3mm-0.4mm.

[0009] As a further description of the above technical solution: both the connecting insulating sleeve and the guide sleeve are provided with air holes.

[0010] As a further description of the above technical solution: the space between the support column and the epoxy pipe is filled with quartz sand.

[0011] As a further description of the above technical solution: two extension columns are installed inside the rotating seat, and torsion springs are sleeved on the extension columns. One end of the torsion spring is inserted into the connecting frame, and the other end of the torsion spring abuts against the surface of the rotating seat.

[0012] As a further description of the above technical solution: a connecting pin is installed inside the rotating seat, and a rotating guide is rotatably connected to the connecting pin. The rotating guide abuts against the connecting line, and a limiting block is provided on the right side of the rotating guide. The limiting block is installed inside the rotating seat.

[0013] As a further description of the above technical solution: an insulating block is provided between the rotating guide and the connecting line, and an arc-shaped groove is provided under the rotating guide. The connecting line is located in the arc-shaped groove, and the insulating block is made of ceramic.

[0014] As a further description of the above technical solution: the connector adopts an insulating sleeve.

[0015] As a further description of the above technical solution: four grooves are provided on the side of the connector, and four limiting blocks are installed in the connection cavity, with the limiting blocks located in the grooves.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. In this invention, when a short circuit or overload fault occurs in the power system, the molten metal in the main circuit rapidly melts and generates an electric arc. After the molten metal melts, an arc voltage is formed at the break point. This voltage surge triggers the impactor inside the support column, causing the impactor's connector to extend outward, thereby achieving mechanical separation from the plug in the connection cavity. This design cleverly transforms an electrical fault into a mechanical action. Even if the molten metal adheres due to a critical fault or aging and fails to completely disconnect electrically, the impactor can still be triggered by the arc voltage and push for mechanical separation, ensuring that the faulty circuit is reliably disconnected. After the connector separates from the connection cavity, the pulling force originally applied to the lower locking ring by the connector disappears. Under the action of gravity or an auxiliary spring, the lower locking ring, rotating seat, and epoxy tube rotate clockwise downward as a whole, thereby creating a visible connection between the upper locking ring and the stationary contact. The physical gap; this process realizes the mechanical tripping separation of the fuse body, forming a dual protection of electrical disconnection and physical isolation; compared with the traditional single fuse melting, the physical isolation disconnection can effectively prevent arc reignition and eliminate the possibility of the fault point being reconnected, providing a higher safety guarantee for the power system; the impactor is independently set inside the support column, and its triggering branch is structurally separated from the main fuse path, avoiding the assembly complexity and operational interference risk caused by the constantan wire passing through the inner hole of the support column in the traditional design; at the same time, the lower connector has a built-in connecting cavity and plug structure, which, together with the connecting wire in the rotating seat, not only realizes stable electrical lead-out, but also allows the fuse to be flexibly adjusted at the site according to the direction of the incoming and outgoing lines through the rotatable connecting frame design, which greatly facilitates construction and maintenance in complex outdoor environments.

[0018] 2. In this invention, once the connector separates from the connecting cavity, the rotating seat loses the tension of the connecting wire. This invention cleverly utilizes dual driving forces to achieve rapid tripping: on the one hand, relying on the gravity of the rotating seat and epoxy tube itself, a natural downward rotational tendency is formed; on the other hand, the elastic potential energy is released through the pre-compressed torsion spring, applying an auxiliary torque to the rotating seat and driving it to rotate rapidly. The energy storage and release of the torsion spring is completed in a very short time, working in conjunction with gravity to enable the rotating seat and epoxy tube to respond quickly, causing the upper locking ring to separate rapidly from the stationary contact, effectively shortening the fault clearing time and ensuring that the fault current can be cut off in a timely manner under abnormal operating conditions of the power system. Gravity provides the basic driving force, while the torsion spring overcomes frictional resistance and ensures crisp and clean action. The two work together to avoid incomplete separation caused by slow action or jamming, ensuring the stability and consistency of the tripping process, thereby significantly improving the safety protection level of the power system under fault conditions.

[0019] 3. In this invention, a trigger assembly consisting of a fuse and a second spring is provided inside the impactor. When the molten metal melts, the arc voltage at the break point rises sharply, causing the fuse flowing through the impactor branch to melt instantly. This causes the second spring, which was originally in a stretched state, to suddenly lose its constraint and instantly release its accumulated elastic potential energy. This elastic force drives the impact pin to eject rapidly along the axial direction and enter the connecting cavity to press the connector, separating it from the connecting cavity. This invention cleverly utilizes the arc voltage generated during the melting of the main molten metal of the fuse as a trigger signal for the impactor's action. When the main circuit is disconnected, the branch fuse melts immediately, and the second spring releases pressure to eject the impact pin. The entire process requires no external power supply or control signal, achieving autonomous response in fault conditions and ensuring the timeliness of the tripping action. By using the elastic potential energy of the spring as a trigger signal for the impactor's action, this invention achieves the trigger signal for the impactor's action. The power source for the mechanical action utilizes the fuse's melting as a trigger switch, achieving efficient conversion of electrical fault signals into mechanical force. The striking pin, after rapidly ejecting, directly acts on the connector, quickly separating the connecting wire from the lower locking ring. The epoxy tube then loses its tension and rapidly trips under gravity and the torsion spring. This energy conversion path is short and has few intermediate links, effectively avoiding the risk of action failure caused by signal transmission delays or mechanical jamming. The fuse integrated inside the striker works in conjunction with the second spring, maintaining stability during normal fuse operation and accurately triggering during faults. The striking pin's ejection directly squeezes the connector, achieving mechanical decoupling between the striker's action and electrical disconnection, ensuring the stability of the fuse tripping process, and further enhancing the power system's safety protection capabilities under fault conditions. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a side view of the three-dimensional structure of the present invention;

[0023] Figure 3 This is a three-dimensional cross-sectional structural diagram of the epoxy tube in this invention;

[0024] Figure 4 This is a frontal cross-sectional view of the epoxy tube in this invention.

[0025] Figure 5 This is a three-dimensional cross-sectional structural diagram of the impactor in this invention;

[0026] Figure 6 This is a three-dimensional structural diagram of the connecting frame in this invention;

[0027] Figure 7 This is a bottom-view three-dimensional structural diagram of the connecting frame in this invention;

[0028] Figure 8 This is a three-dimensional structural diagram of the rotating guide frame in this invention;

[0029] In the diagram: 1. Insulating porcelain bottle; 2. Upper mounting steel foot; 3. Anti-icing cover; 4. Static contact plate; 5. First spring; 6. Support plate; 7. Hook; 8. Upper locking ring; 9. Epoxy tube; 10. Lower locking ring; 11. Upper outer cap; 12. Lower outer cap; 13. First connecting sleeve; 14. Second connecting sleeve; 15. Melt; 16. Support column; 17. Impactor; 171. Guide sleeve; 172. Limiting ring; 173. Impact pin; 174. Second spring 175. Brass pad; 176. Fuse wire; 177. Copper tube; 178. Connecting insulating sleeve; 179. Copper wire; 18. Air hole; 19. Connector; 20. Connecting cavity; 21. Plug; 22. Connecting wire; 23. Limiting block; 24. Rotating seat; 25. Connecting pin; 26. Rotating guide; 27. Insulating block; 28. Limiting stop; 29. ​​Connecting frame; 30. Lower mounting steel foot; 31. Extension column; 32. Torsion spring. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Example 1:

[0032] like Figures 1 to 8 As shown, an outdoor high-voltage current-limiting fuse includes an epoxy tube 9; an upper locking ring 8 and a lower locking ring 10 are respectively fitted at the upper and lower ends of the epoxy tube 9. A stationary contact piece 4 is provided on the upper locking ring 8, and the stationary contact piece 4 is bolted to the underside of an anti-icing cover 3. A first spring 5 is installed on the stationary contact piece 4, and the other end of the first spring 5 is installed under the anti-icing cover 3. An upper mounting steel foot 2 is installed on the side of the anti-icing cover 3, and a support plate 6 is bolted to the underside of the anti-icing cover 3. A hook 7 is installed on the side of the support plate 6, and the hook 7 is located on the outer surface of the epoxy tube 9. A rotating seat 24 is hinged to the side of the lower locking ring 10, and the rotating seat 24 is rotatably connected to a connecting frame 29. The connecting frame 29 is bolted to the underside of the lower mounting steel foot 30, and the upper mounting steel foot 10 is bolted to the lower mounting steel foot 30. Foot 2 and lower mounting steel foot 30 are respectively installed at the upper and lower ends of the insulating porcelain bottle 1. The bottom end of the epoxy tube 9 is equipped with a lower outer cap 12, and the top end of the epoxy tube 9 is equipped with an upper outer cap 11. The upper outer cap 11 is provided with a first connecting sleeve 13, and the lower outer cap 12 is provided with a second connecting sleeve 14. A melt 15 is connected between the first connecting sleeve 13 and the second connecting sleeve 14. A support column 16 is installed between the first connecting sleeve 13 and the second connecting sleeve 14. An impactor 17 is provided inside the support column 16. A connector 19 is provided inside the lower locking ring 10. A connecting cavity 20 is opened inside the connector 19. A plug 21 is provided inside the connecting cavity 20. A connecting wire 22 is connected to the plug 21. The connecting wire 22 is installed inside the rotating seat 24.

[0033] When a short circuit or overload occurs, the fusible element 15 melts rapidly and generates an electric arc. After the fusible element 15 melts, the arc voltage at the break point rises sharply, which energizes the inside of the impactor 17 and causes it to extend and impact the connector, thus separating the connector from the connecting cavity 20. This causes the pulling force of the connecting wire 22 on the lower locking ring 10 to disappear. At this time, the lower locking ring 10, the rotating seat 24, and the epoxy tube 9 rotate clockwise downwards, which separates the upper locking ring 8 from the stationary contact 4, thus completing the circuit disconnection and tripping separation of the fuse. In this scheme, the physical isolation and disconnection are achieved through the tripping separation of the fuse, making the fusing process safer and more reliable. After the fuse trips, it is convenient to replace or repair the fuse later.

[0034] like Figures 6 to 7 As shown: Two extension columns 31 are installed inside the rotating base 24. A torsion spring 32 is provided on the outer sleeve of the extension column 31. One end of the torsion spring 32 is inserted into the connecting frame 29, and the other end of the torsion spring 32 abuts against the surface of the rotating base 24.

[0035] When the connector 21 is separated from the connecting cavity 20, the rotating seat 24 loses the pull of the connecting wire 22. The rotating seat 24 and the epoxy tube 9 automatically rotate clockwise downwards due to gravity. At the same time, the pre-compressed torsion spring 32 uses its own torque to control the rotating seat 24 to rotate rapidly, thereby causing the rotating seat 24 and the epoxy tube 9 to rotate rapidly. This causes the upper locking ring 8 to separate rapidly from the stationary contact piece 4, making the tripping action of the fuse more efficient and timely, ensuring the stability of the fuse disconnection process, and thus ensuring smooth fuse disconnection in the event of abnormal power system conditions, thereby improving the safety of the power system.

[0036] like Figures 6 to 7 As shown: A connecting pin 25 is installed inside the rotating base 24, and a rotating guide 26 is rotatably connected to the outside of the connecting pin 25. The rotating guide 26 abuts against the connecting line 22. A limit block 28 is provided on the right side of the rotating guide 26, and the limit block 28 is installed inside the rotating base 24.

[0037] In the initial state where the fuse has not melted, the impactor 17 is in an unextended state. At this time, the connecting wire 22 applies a pulling force between the rotating seat 24 and the lower locking ring 10, so that the lower locking ring 10 and the epoxy tube 9 are in a relatively stable state relative to the rotating seat 24. At the same time, the rotating guide 26 abuts against the limiting block 28, so that the rotating guide 26 supports and guides the connecting wire 22, allowing one end of the connecting wire 22 and the plug 21 to extend smoothly into the lower locking ring 10, applying a downward pulling force to the lower locking ring 10, thereby keeping the fuse stable in the initial state where it has not melted. When the rotating seat 24 trips and rotates downward, the rotating guide 26 is squeezed and rotates around the connecting pin 25, so that the rotating guide 26 will not obstruct the tripping rotation of the rotating seat 24 and the epoxy tube 9, thereby preventing the rotating guide 26 from being damaged by impact.

[0038] like Figures 6 to 8 As shown: An insulating block 27 is installed under the rotating guide 26 between the rotating guide 26 and the connecting line 22. An arc-shaped groove is opened under the insulating block 27, and the connecting line 22 is located in the arc-shaped groove. The insulating block 27 is made of ceramic.

[0039] The connecting wire 22 is made of copper wire wrapped with a rubber layer. The copper wire increases the strength of the connecting wire 22, and the rubber layer increases the wear resistance and insulation effect of the connecting wire 22, so that the connecting wire 22 can exert a stable tension on the rotating seat 24 and the lower locking ring 10. The insulating block 27 keeps the rotating guide 26 and the connecting wire 22 in an insulated state, avoiding short circuit between them. At the same time, the ceramic insulating block 27 reduces the friction between the connecting wire 22 and the rotating guide 26, thereby reducing the wear rate of the connecting wire 22 when sliding on the surface of the rotating guide 26. Meanwhile, the groove prevents the connecting wire 22 from sliding in the front and back direction on the surface of the rotating guide 26, thus preventing the connecting wire 22 from falling off the surface of the rotating guide 26, thereby ensuring the stable tension of the connecting wire 22 on the rotating seat 24 and the lower locking ring 10.

[0040] like Figures 3 to 4 As shown: Connector 19 uses an insulating sleeve.

[0041] The insulating sleeve isolates and insulates the plug 21 from the lower locking ring 10, thereby preventing short circuits caused by arc overflow when the impactor 17 extends and impacts the plug 21, thus ensuring the safety of the plug 21 when it is detached from the connector 19.

[0042] like Figures 3 to 4 As shown: The side of the connector 21 has four grooves, and four limiting blocks 23 are installed in the connecting cavity 20. The limiting blocks 23 are located in the grooves.

[0043] The limiting block 23 is a solid elastic element. During the process of inserting the plug 21 into the connecting cavity 20, the plug 21 will squeeze the limiting block 23 to deform. When the top of the plug 21 passes the limiting block 23, the limiting block 23 returns to its original shape and enters the groove. The plug 21 moves upward until it abuts against the lower surface of the connector 19, thereby completing the assembly process of the plug 21. The limiting block 23 increases the resistance when the plug 21 moves downward, preventing the plug 21 from falling off uncontrollably, thereby ensuring a stable connection between the plug 21 and the connecting wire 22 and the connector 19.

[0044] Example 2:

[0045] like Figures 3 to 5As shown: The impactor 17 includes a guide sleeve 171 installed inside the support column 16. The guide sleeve 171 is a cylindrical structure with an open bottom end. The bottom opening of the guide sleeve 171 passes through the lower outer cap 12 and communicates with the connecting cavity 20. A limiting ring 172 is provided inside the guide sleeve 171. A striking pin 173 is provided on the inner wall of the limiting ring 172. The striking pin 173 is a cylindrical structure with an open top end. A brass pad 175 is installed inside the striking pin 173. A second spring 17 is installed on the brass pad 175. 4. The top end of the second spring 174 is fixedly connected to the inner top wall of the guide sleeve 171. A connecting insulating sleeve 178 is installed on the guide sleeve 171. A fuse 176 is installed on the brass pad 175. The top end of the fuse 176 passes through the connecting insulating sleeve 178 and is connected to the copper tube 177. The copper tube 177 is installed on the connecting insulating sleeve 178. A copper wire 179 is installed at the top end of the copper tube 177. The top end of the copper wire 179 is installed under the upper outer cap 11.

[0046] After the fusible element 15 melts, the arc voltage at the break point rises sharply. At this time, current flows through the fuse wire 176, and the fuse wire 176 melts instantly. The second spring 174 loses its tension and releases its own elasticity instantly. The elasticity controls the striker 173 to pop out quickly along the axial direction. At this time, the striker 173 enters the connecting cavity 20 and squeezes the plug 21 to move downward. In this invention, the release of the second spring 174 is controlled by the melting process, and the extension of the striker 173 is automatically controlled by the melting process of the fuse. This quickly controls the plug 21 and the connecting wire 22 to separate from the lower locking ring 10, so that the epoxy tube 9 quickly loses its tension when the fuse melts, and the fuse can be quickly tripped and separated, thus ensuring the stability of the melting process.

[0047] like Figure 5 As shown: the fuse 176 is a steel wire with a diameter of 0.2mm-0.3mm, and the copper wire 179 has a diameter of 0.3mm-0.4mm.

[0048] The steel wire is 0.2mm-0.3mm in size, which makes it highly resistant. When the melt 15 is energized, there is almost no current inside the steel wire. After the melt 15 melts, the current flowing inside the steel wire will quickly melt it, thereby quickly releasing the pressure of the second spring 174.

[0049] like Figure 5 As shown: Both the insulating sleeve 178 and the guide sleeve 171 are provided with air holes 18.

[0050] The vent 18 connects the interior of the guide sleeve 171 with the interior space of the epoxy tube 9. When the striker 173 is extended by the elastic force of the second spring 174, air outside the guide sleeve 171 can be drawn into the interior of the guide sleeve 171, so that the extension action of the striker 173 responds in a timely manner, thereby increasing the stability and efficiency of the extension action of the impactor 17 itself. The air outside the guide sleeve 171 is drawn into the interior of the guide sleeve 171, thereby reducing the amount of air outside the guide sleeve 171, which to a certain extent reduces the probability of the copper wire 179 generating an electric arc and improves the safety of the impactor 17 during operation.

[0051] like Figures 3 to 4 As shown: Quartz sand is filled between support 16 and epoxy pipe 9.

[0052] The quartz sand filling between the support column 16 and the epoxy pipe 9 surrounds the molten body 15, eliminating the electric arc generated when the molten body 15 is energized, thereby improving the safety of the fuse during operation.

[0053] During operation, when a short circuit or overload occurs, the fusible element 15 melts rapidly and generates an electric arc. After the fusible element 15 melts, the arc voltage at the break point rises sharply. At this time, current flows through the fuse 176, and the fuse 176 melts instantly. The second spring 174 loses its tension and releases its own elastic force instantly. The elastic force controls the striker 173 to pop out rapidly along the axial direction. At this time, the striker 173 enters the connecting cavity 20 and squeezes the plug 21 to move downward, thereby causing the plug 21 to move downward. The plug 21 passes over the limit block 23 and falls out of the connecting cavity 20. At this time, the rotating seat 24 loses the tension of the connecting wire 22. The torque of the torsion spring 32 controls the rotating seat 24 to rotate clockwise downward, thereby causing the lower locking ring 10 and the epoxy tube 9 to rotate rapidly, thereby causing the upper locking ring 8 to automatically disengage from the stationary contact 4, completing the mechanical tripping disconnection, and thus achieving the purpose of protecting the circuit.

[0054] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. An outdoor high-voltage current-limiting fuse, comprising an epoxy tube (9); characterized in that: The epoxy tube (9) is fitted with an upper locking ring (8) and a lower locking ring (10) at its upper and lower ends, respectively; a rotating seat (24) is hinged to the side of the lower locking ring (10); the rotating seat (24) is rotatably connected to the connecting frame (29); a lower outer cap (12) is installed at the bottom of the epoxy tube (9); an upper outer cap (11) is installed at the top of the epoxy tube (9); a first connecting sleeve (13) is provided under the upper outer cap (11); a second connecting sleeve (14) is provided on the lower outer cap (12); the first connecting sleeve (13) is provided under the upper outer cap (11). 3) A melt (15) is connected between the first connecting sleeve (13) and the second connecting sleeve (14); a support column (16) is installed between the first connecting sleeve (13) and the second connecting sleeve (14); an impactor (17) is provided in the support column (16); a connector (19) is provided in the lower locking ring (10); a connecting cavity (20) is opened in the connector (19); a plug (21) is provided in the connecting cavity (20); a connecting wire (22) is connected to the plug (21); the connecting wire (22) is installed in the rotating seat (24); The impactor (17) includes a guide sleeve (171) installed inside the support column (16); the guide sleeve (171) is a cylindrical structure with an open bottom end; the open bottom end of the guide sleeve (171) passes through the lower outer cap (12) and communicates with the connecting cavity (20); a limiting ring (172) is provided inside the guide sleeve (171); a striking pin (173) is provided on the inner wall of the limiting ring (172); the striking pin (173) is a cylindrical structure with an open top end; a brass pad (175) is installed inside the striking pin (173); a second spring (174) is installed on the brass pad (175). The top end of the second spring (174) is fixedly connected to the inner top wall of the guide sleeve (171); a connecting insulating sleeve (178) is installed on the guide sleeve (171); a fuse (176) is installed on the brass pad (175); the top end of the fuse (176) passes through the connecting insulating sleeve (178) and is connected to the copper tube (177); the copper tube (177) is installed on the connecting insulating sleeve (178); a copper wire (179) is installed at the top end of the copper tube (177); the top end of the copper wire (179) is installed under the upper outer cap (11); A connecting pin (25) is installed inside the rotating seat (24); a rotating guide (26) is rotatably connected to the connecting pin (25); the rotating guide (26) abuts against the connecting line (22); a limiting block (28) is provided on the right side of the rotating guide (26); the limiting block (28) is installed inside the rotating seat (24); An insulating block (27) is provided between the rotating guide (26) and the connecting line (22) and installed under the rotating guide (26); an arc-shaped groove is provided under the insulating block (27); The side of the connector (21) has four grooves, and four limiting blocks (23) are installed in the connecting cavity (20); the limiting blocks (23) are located in the grooves.

2. The outdoor high-voltage current-limiting fuse according to claim 1, characterized in that: The fuse wire (176) is a steel wire with a diameter of 0.2mm-0.3mm; the copper wire (179) has a diameter of 0.3mm-0.4mm.

3. An outdoor high-voltage current-limiting fuse according to claim 2, characterized in that: Both the connecting insulating sleeve (178) and the guide sleeve (171) are provided with air holes (18).

4. An outdoor high-voltage current-limiting fuse according to claim 3, characterized in that: Quartz sand is filled between the support (16) and the epoxy pipe (9).

5. An outdoor high-voltage current-limiting fuse according to claim 4, characterized in that: Two extension columns (31) are installed inside the rotating base (24); a torsion spring (32) is provided on the outer sleeve of the extension column (31); one end of the torsion spring (32) is inserted into the connecting frame (29); the other end of the torsion spring (32) abuts against the surface of the rotating base (24).

6. An outdoor high-voltage current-limiting fuse according to claim 5, characterized in that: The connector (19) is equipped with an insulating sleeve.

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