A detachable lightning arrester

Abstract

The utility model provides a detachable lightning arrester, its adopt annular rubber ring and annular accommodating groove's expansion tight cooperation structure between lightning arrester core and composite outer cover, make the core reliable positioning and form stable mechanical connection in the assembly process, avoid the heat stress concentration and assembly complex etc. of traditional structure because of the problem of sticking or cast joint. Meanwhile, the top and bottom end of composite outer cover is provided with second annular rubber ring and sets up the second annular accommodating groove cooperation of setting on end cover, makes end cover can be firmly installed in the both ends of composite outer cover, not only plays the structure fixed role, still further realizes the sealing protection to lightning arrester internal structure. In addition, the expansion tight cooperation of annular rubber ring and second annular rubber ring facilitates assembly and disassembly, improves the maintainability and on -the -spot replacement efficiency of lightning arrester, reduces operation and maintenance cost. Therefore, the detachable lightning arrester realizes the modularization separation, improves the maintenance convenience and operation reliability of product.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, specifically a separable surge arrester. Background Technology

[0002] In power systems, surge arresters are electrical devices used to protect electrical equipment from lightning surges and other high transient overvoltages. They primarily work by rapidly conducting through nonlinear resistive elements, dissipating overvoltage energy to ground, and quickly restoring insulation after the overvoltage is removed, thus protecting the safe operation of transmission lines, substations, and other critical electrical equipment. Post-mounted surge arresters are a common type, particularly suitable for installation at connection points between overhead lines or switchgear.

[0003] Existing separable post-type surge arresters typically employ an integrated structure, where the arrester core and ceramic or composite insulating shell are integrally cast or molded to form a sealed arrester device. While this structure offers good protection, insulation, and protection against rain and dust, it presents numerous inconveniences during use and maintenance. For instance, when components such as the resistor elements inside the arrester core are damaged or aged, because the shell and core are inseparable, users often need to break the entire shell to replace internal parts. This not only results in high maintenance costs and complex operations but also risks damaging other structural components during disassembly. Furthermore, the integrated casting structure also presents certain manufacturing challenges. Due to the effects of thermal expansion and contraction and solidification shrinkage, the casting process may cause pressure, misalignment, or stress concentration on internal components, potentially leading to damage or poor contact, thereby affecting the arrester's normal operating performance and service life. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a separable surge arrester, which effectively improves the problems of some traditional surge arresters, such as non-removable structure, difficult maintenance, and easily damaged internal components.

[0005] A separable surge arrester includes a surge arrester core, a composite outer casing, and an end cover. The surge arrester core includes a core support, an upper electrode, a lower electrode, multiple surge arrester modules, and a connecting channel. The upper electrode is installed at the top of the core support, and the lower electrode is installed at the bottom of the core support. The multiple surge arrester modules are sequentially arranged along the axial direction of the core support on the outside of the core support. A gap is provided between each surge arrester module to form the connecting channel. Multiple annular conductive protrusions are provided on the opposite side of each surge arrester module. The annular conductive protrusions on each surge arrester module abut against the annular conductive protrusions on the opposite surge arrester module. The protrusions near the upper electrode and the lower electrode are... Each surge arrester module is provided with at least one annular limiting groove, and an annular rubber ring is provided on the annular limiting groove; the composite outer sleeve includes an insulating tube and an insulating umbrella sleeve fitted outside the insulating tube. The top and bottom ends of the inner sidewall of the insulating tube are recessed towards the outer sidewall and are provided with at least one annular receiving groove that is tightly connected to the annular rubber ring. The top and bottom outer sidewalls of the insulating umbrella sleeve are provided with a second annular limiting groove towards the inner sidewall and a second annular rubber ring is provided on the second annular limiting groove; the end cover is a bottle cap-shaped end cover. The top plane of the end cover is provided with a through hole in the middle. The inner sidewall of the end cover is recessed towards the outer sidewall and is provided with a second annular receiving groove that is connected to the second annular rubber ring.

[0006] Preferably, the connection channel is filled with thermally conductive silicone or a flexible graphite film.

[0007] Preferably, each of the surge arrester modules includes multiple metal oxide rheostats connected in series.

[0008] Furthermore, at least one rheostat element in the surge arrester module is embedded with a temperature-sensitive fuse element.

[0009] Preferably, the core support is a high-strength carbon steel core support, and the outer side of the high-strength carbon steel core support is covered with a high-conductivity copper layer, a silver layer, or a zinc oxide layer.

[0010] Preferably, the lower electrode is connected to a grounding screw protruding from the end of the end cover plate, and the upper electrode is connected to a high-voltage screw protruding from the other end of the end cover plate.

[0011] Preferably, a rubber ring is provided at the opening of the through hole, and the diameter of the through hole is equal to the diameter of the grounding screw and the high-voltage screw.

[0012] Preferably, the insulating tube is a glass fiber reinforced epoxy resin insulating tube.

[0013] Preferably, the insulating umbrella sleeve is provided with multiple levels of umbrella skirts distributed along the axial direction, the spacing between adjacent umbrella skirts is 20-35mm, the angle between each level of umbrella skirt and the axis of the insulating tube is 10-25°, and each umbrella skirt has a wave-shaped turbulence structure on its outer edge.

[0014] Preferably, the insulating umbrella cover is a thermally conductive modified silicone rubber insulating umbrella cover, and the surface of the umbrella skirt has a roughened black coating.

[0015] Preferably, a first threaded hole is provided on the surge arrester module near the upper electrode and the lower electrode, and a second threaded hole is provided on the corresponding position of the composite sleeve. The first threaded hole and the second threaded hole are connected by a bolt.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention provides a separable surge arrester. The arrester core and composite jacket utilize a tightening structure with an annular rubber ring and an annular receiving groove. This structure ensures reliable positioning and a stable mechanical connection of the core during assembly, avoiding the problems of thermal stress concentration and assembly complexity caused by bonding or casting in traditional structures. Simultaneously, second annular rubber rings are provided at the top and bottom ends of the composite jacket, and a second annular receiving groove is provided on the end cover plate. This allows the end cover plate to be securely installed at both ends of the composite jacket, not only providing structural fixation but also further sealing and protecting the internal structure of the surge arrester. As can be seen, the annular and second annular rubber rings together achieve a tight connection between the structures and form multiple seals. They possess excellent flexible fitting performance and heat-resistant insulation capabilities, effectively preventing moisture, dust, and other impurities from entering the surge arrester's interior, thus avoiding performance degradation of core components such as metal oxide rheostats caused by humid environments. Furthermore, the tightening fit between the annular and second annular rubber rings facilitates assembly and disassembly, improving the maintainability and on-site replacement efficiency of the surge arrester and reducing operation and maintenance costs. Therefore, this separable surge arrester not only achieves modular separation, improving the product's ease of maintenance and operational reliability, but also demonstrates excellent performance in terms of sealing, electrical insulation, and thermal stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the detachable surge arrester described in this utility model;

[0019] in:

[0020] 10-Surge arrester core, 20-Composite outer sleeve, 30-End cover plate, 11-Core support body, 12-Upper electrode, 13-Lower electrode, 14-Surge arrester module, 15-Connection channel, 16-Annular conductive protrusion, 17-Annular limiting groove, 18-Annular rubber ring, 19-Grounding screw, 110-High voltage screw, 21-Insulating tube, 22-Insulating umbrella sleeve, 23-Annular receiving groove, 24-Secondary annular limiting groove, 25-Secondary annular rubber ring, 31-Secondary annular receiving groove. Detailed Implementation

[0021] The embodiments described below are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] See Figure 1 This embodiment provides a separable surge arrester, which includes a surge arrester core 10, a composite jacket 20, and an end cover 30.

[0023] The surge arrester core 10 includes a core support 11, an upper electrode 12, a lower electrode 13, multiple surge arrester modules 14, and a connecting channel 15. The upper electrode 12 is installed at the top of the core support 11, and the lower electrode 13 is installed at the bottom of the core support 11. The multiple surge arrester modules 14 are arranged sequentially along the axial direction of the core support 11 on the outside of the core support 11. A gap is provided between each surge arrester module 14 to form the connecting channel 15. Multiple annular conductive protrusions 16 are provided on the opposite side of each surge arrester module 14. The annular conductive protrusions 16 on each surge arrester module 14 abut against the annular conductive protrusions 16 on its opposite surge arrester module 14. At least one annular limiting groove 17 is provided on each surge arrester module 14 near the upper electrode 12 and the lower electrode 13. An annular rubber ring 18 is provided on the annular limiting groove 17. By incorporating a core support 11, an upper electrode 12, a lower electrode 13, and multiple arrester modules 14 sequentially installed along the axial direction within the arrester core 10, the entire core structure possesses excellent modular assembly capabilities and a complete conductive path, facilitating segmented design and maintenance of internal components. Gaps are provided between each arrester module 14, forming connection channels 15. This not only facilitates tolerance absorption and thermal expansion buffering but also serves as a heat conduction path to aid in heat dissipation from the arrester core 10, enhancing the overall thermal stability. Multiple annular conductive protrusions 16 are provided on opposite sides of each arrester module 14. This structure enables multi-point elastic electrical contact between modules, ensuring stable current conduction and providing excellent vibration resistance and compensation capabilities. It can adapt to contact deviations caused by thermal expansion and contraction or assembly position differences, effectively preventing arc discharge or performance degradation due to poor contact.

[0024] The composite outer sleeve 20 includes an insulating tube 21 and an insulating umbrella sleeve 22 sleeved on the outside of the insulating tube 21. The top and bottom ends of the inner sidewall of the insulating tube 21 are recessed towards the outer sidewall and are provided with at least one annular receiving groove 23 that is tightly connected to the annular rubber ring 18. The top and bottom outer sidewalls of the insulating umbrella sleeve 22 are provided with a second annular limiting groove 24 towards the inner sidewall, and a second annular rubber ring 25 is provided on the second annular limiting groove 24.

[0025] The end cover plate 30 is a bottle cap-shaped end cover plate 30, which is sleeved on the end of the composite outer sleeve 20. A through hole is provided in the middle of the top plane of the end cover plate 30, which is used for the grounding screw 19 and the high-voltage screw 110 to pass through. The inner side wall of the end cover plate 30 is recessed to the outer side wall and is provided with a second annular receiving groove 31 that is connected to the second annular rubber ring 25.

[0026] It should be noted that during installation, the assembled surge arrester core 10 is inserted into the insulating tube 21, and the surge arrester core 10 and the composite outer sleeve 20 are positioned and sealed by the expansion and tightening between the annular rubber ring 18 and the annular receiving groove 23; then the end cover plate 30 is sleeved on both ends of the composite outer sleeve 20, and the end seal is achieved by the cooperation between the second annular receiving groove 31 on its inner side and the second annular rubber ring 25.

[0027] Preferably, the connection channel 15 is filled with thermally conductive silicone or a flexible graphite film. The thermally conductive silicone or flexible graphite film achieves efficient heat exchange and dissipation by maintaining close contact with the insulating tube 21 on the outside of the surge arrester core 10. The thermally conductive silicone and flexible graphite film have excellent thermal conductivity and good elasticity, effectively filling the gaps in the connection channel 15, avoiding thermal resistance, and ensuring that the heat generated by the core can be quickly conducted to the surface of the insulating tube 21. Then, the heat is further conducted to the insulating sheath 22 through the insulating tube 21, achieving overall heat dissipation.

[0028] Preferably, each surge arrester module 14 includes multiple metal oxide rheostats connected in series. This gives each module higher voltage distribution capability and better current dispersion performance. Under lightning impulse or switching overvoltage, the multiple rheostats work together to effectively share the voltage load, enhance the overall voltage bearing capacity of the module, and significantly improve the surge arrester's withstand voltage level and impulse current absorption capacity. Furthermore, the multi-rheostat structure facilitates the screening and matching of the performance of individual rheostats, ensuring more stable and consistent electrical performance of the entire module, thereby improving the protection reliability of the entire surge arrester product. This structure also provides good maintenance and replacement flexibility; if the performance of one rheostat degrades, it can be replaced individually, reducing later maintenance costs.

[0029] Furthermore, at least one rheostat element in the surge arrester module 14 is embedded with a temperature-sensitive fuse. By embedding a temperature-sensitive fuse element in at least one metal oxide rheostat element in the surge arrester module 14, the current path of the faulty rheostat element can be quickly cut off when the temperature rise of the rheostat exceeds a predetermined threshold due to power frequency follow current, aging degradation, or abnormal heating. This effectively prevents the overheating from spreading further and causing the surge arrester to explode or catch fire, significantly improving the operational safety and fault self-control capability of the entire surge arrester.

[0030] Preferably, the core support 11 is a high-strength carbon steel core support 11, and the outer side of the high-strength carbon steel core support 11 is covered with a high-conductivity copper layer, a silver layer, or a zinc oxide layer, preferably a zinc oxide layer. Using high-strength carbon steel as the base material of the core support 11 can significantly improve the mechanical strength and structural stability of the entire surge arrester core 10.

[0031] Preferably, the lower electrode 13 is connected to a grounding screw 19 protruding from the end of the end cover plate 30, and the upper electrode 12 is connected to a high-voltage screw 110 protruding from the other end of the end cover plate 30. By providing the grounding screw 19, the surge arrester can be reliably connected to the ground wire or grounding device during installation, ensuring that the lightning current can be quickly and safely discharged to the ground, thus improving the reliability and safety of the grounding system. Simultaneously, the high-voltage screw 110 makes the electrical connection between the surge arrester and the high-voltage transmission line or busbar more direct and efficient, reducing the contact resistance at the connection point and enhancing the overall conductivity and response speed of the system.

[0032] Preferably, a rubber ring is provided at the opening of the through hole, and the diameter of the through hole is equal to the diameter of the grounding screw 19 and the high-voltage screw 110. By providing a rubber ring at the opening of the through hole, a reliable seal can be achieved when the grounding screw 19 and the high-voltage screw 110 pass through the end cover plate 30, preventing moisture, dust, or corrosive gases from entering the surge arrester, effectively improving the overall environmental adaptability and long-term operational stability of the surge arrester. Simultaneously, the diameter of the through hole ensures smooth installation while avoiding structural shaking or poor sealing caused by an excessively large diameter, enhancing the mechanical stability and sealing performance of the connection points.

[0033] Preferably, the insulating tube 21 is a glass fiber reinforced epoxy resin insulating tube 21 or an alumina ceramic insulating tube 21 with a boron nitride coating on its surface, more preferably an alumina ceramic insulating tube 21 with a boron nitride coating on its surface. Alumina ceramic itself has high thermal conductivity, and the boron nitride coating, as a high thermal conductivity insulating material, can effectively conduct the heat generated by the surge arrester module 14 during operation to the external environment through the connection channel 15, achieving timely heat release, preventing local overheating of the module that could lead to performance degradation or thermal failure, and improving the safety and reliability of the entire system.

[0034] Preferably, the insulating sheath 22 is provided with multiple levels of axially distributed skirts, which can effectively increase the creepage distance and enhance the overall anti-pollution flashover capability of the surge arrester. The spacing between adjacent skirts is 20-35mm, and the angle between each level of skirt and the axis of the insulating tube 21 is 10-25°, making the skirt arrangement more compact and reasonable. This is beneficial for improving the creepage distance within a limited length, while ensuring that rainwater and dirt are difficult to accumulate, avoiding the formation of continuous conductive channels, thereby improving the operational stability of the surge arrester in humid or highly polluted environments. Furthermore, each skirt has a waveform turbulence structure on its outer edge. The peaks and troughs of this waveform turbulence structure are arranged alternately and continuously distributed along the edge of the skirt. Specifically, the peak height of this waveform structure is preferably 1.0-3.0 mm, and the wavelength (i.e., the distance between adjacent peaks) is preferably 5-15 mm, to ensure good turbulence effect without affecting the mechanical strength of the skirt. Therefore, this wave-shaped turbulence structure effectively disrupts stable airflow and enhances air convection by altering the direction and speed of airflow, creating localized vortex zones. This promotes the rapid diffusion and removal of heat and moisture around the umbrella skirt surface. Furthermore, the wavy edge design generates irregular water droplet impacts during rainfall or wind, helping to wash away dirt deposits on the umbrella skirt surface, reducing dirt buildup, improving self-cleaning capabilities, and further enhancing the surge arrester's pollution resistance and insulation reliability.

[0035] Preferably, the insulating shed 22 is made of thermally modified silicone rubber, and the surface of the skirt has a roughened black coating. Using thermally modified silicone rubber as the material for the insulating shed 22 significantly improves its thermal conductivity, facilitating effective heat dissipation within the surge arrester, reducing component temperature, and enhancing overall operational safety and reliability. Simultaneously, the thermally modified silicone rubber itself possesses excellent flexibility and aging resistance, enhancing the mechanical durability and service life of the shed. The roughened black coating on the skirt surface not only enhances surface roughness, improving anti-fouling, dustproof, and anti-slip effects, but also effectively improves surface resistance to ultraviolet radiation and environmental aging, extending the outdoor service life of the surge arrester.

[0036] Preferably, a first threaded hole is formed on the surge arrester module 14 near both the upper electrode 12 and the lower electrode 13, and a second threaded hole is formed on the composite sleeve 20 at the corresponding position. The first threaded hole and the second threaded hole are connected by a bolt. By providing the first threaded hole and the second threaded hole at the corresponding positions on the surge arrester module 14 and the composite sleeve 20, and using a bolt connection, a more secure fixation between the surge arrester module 14 and the composite sleeve 20 is achieved. This connection structure not only improves the mechanical strength and stability of the overall component, preventing the module from loosening or falling off due to vibration or external force during use, but also provides a rubber sealing cap at the opening of the first threaded hole to seal against moisture.

[0037] This invention provides a separable surge arrester. The arrester core 10 and composite jacket 20 utilize a tightening fit structure of annular rubber ring 18 and annular receiving groove 23. This ensures reliable positioning and a stable mechanical connection of the core during assembly, avoiding the problems of thermal stress concentration and assembly complexity caused by bonding or casting in traditional structures. Simultaneously, second annular rubber rings 25 and second annular receiving grooves 31 on end caps 30 are provided at the top and bottom ends of the composite jacket 20, allowing the end caps 30 to be securely installed at both ends of the composite jacket 20. This not only provides structural fixation but also further seals and protects the internal structure of the surge arrester. As can be seen, the annular rubber ring 18 and the second annular rubber ring 25 together achieve a tight connection between the structures and form multiple seals. They possess excellent flexible fit and heat-resistant insulation capabilities, effectively preventing moisture, dust, and other impurities from entering the surge arrester and avoiding performance degradation of core components such as metal oxide rheostats caused by humid environments. Furthermore, the tightening fit between the annular rubber ring 18 and the second annular rubber ring 25 facilitates assembly and disassembly, improving the maintainability and on-site replacement efficiency of the surge arrester and reducing operation and maintenance costs. Therefore, this separable surge arrester not only achieves modular separation, improving the convenience of product maintenance and operational reliability, but also exhibits excellent performance in terms of sealing, electrical insulation, and thermal stability.

[0038] The above-disclosed embodiments are merely some preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model patent application shall still fall within the scope of the present utility model.

Claims

1. A separable surge arrester, comprising a surge arrester core, a composite outer casing, and an end cover plate, characterized in that: The surge arrester core includes a core support, an upper electrode, a lower electrode, multiple surge arrester modules, and a connecting channel. The upper electrode is installed at the top of the core support, and the lower electrode is installed at the bottom of the core support. The multiple surge arrester modules are sequentially arranged along the axial direction of the core support on the outside of the core support. A gap is provided between each surge arrester module to form the connecting channel. Multiple annular conductive protrusions are provided on the opposite side of each surge arrester module. The annular conductive protrusions on each surge arrester module abut against the annular conductive protrusions on the opposite surge arrester module. At least one annular limiting groove is provided on each surge arrester module near the upper electrode and the lower electrode. An annular rubber ring is provided on the annular limiting groove. The composite jacket includes an insulating tube and an insulating umbrella sleeve fitted outside the insulating tube. The top and bottom ends of the inner sidewall of the insulating tube are recessed towards the outer sidewall and are provided with at least one annular receiving groove that is tightly connected to the annular rubber ring. The top and bottom outer sidewalls of the insulating umbrella sleeve are provided with a second annular limiting groove towards the inner sidewall and a second annular rubber ring is provided on the second annular limiting groove. The end cap is a bottle cap-shaped end cap, which is fitted onto the end of the composite outer sleeve. A through hole is provided in the middle of the top plane of the end cap, and a second annular receiving groove that connects to the second annular rubber ring is recessed on the inner side wall of the end cap towards the outer side wall.

2. The separable surge arrester as described in claim 1, characterized in that, The connection channel is filled with thermally conductive silicone or a flexible graphite film.

3. The detachable surge arrester of claim 1, wherein, Each surge arrester module includes multiple metal oxide rheostats connected in series.

4. The separable surge arrester of claim 3, wherein, At least one rheostat element in the surge arrester module is embedded with a temperature-sensitive fuse.

5. The detachable surge arrester of claim 1, wherein, The core support is a high-strength carbon steel core support, and the outer side of the high-strength carbon steel core support is covered with a high-conductivity copper layer, a silver layer, or a zinc oxide layer.

6. The detachable surge arrester of claim 1, wherein, The lower electrode is connected to a grounding screw protruding from the end of the end cover plate, and the upper electrode is connected to a high-voltage screw protruding from the other end of the end cover plate.

7. The separable surge arrester as described in claim 6, characterized in that, A rubber ring is provided at the opening of the through hole, and the diameter of the through hole is equal to the diameter of the grounding screw and the high-voltage screw.

8. The detachable surge arrester of claim 1, wherein, The insulating tube is a glass fiber reinforced epoxy resin insulating tube or an alumina ceramic insulating tube with a boron nitride coating on its surface.

9. The detachable surge arrester of claim 1, wherein, The insulating umbrella sleeve is provided with multiple levels of umbrella skirts distributed along the axial direction. The distance between adjacent umbrella skirts is 20-35mm. The angle between each level of umbrella skirt and the axis of the insulating tube is 10-25°. Furthermore, each umbrella skirt has a wave-shaped turbulence structure on its outer edge.

10. The detachable surge protector of claim 1, wherein, A first threaded hole is provided on the surge arrester module near the upper electrode and the lower electrode, and a second threaded hole is provided on the corresponding position of the composite sleeve. The first threaded hole and the second threaded hole are connected by a bolt.

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