A modularly detachable surge arrester

Abstract

This utility model relates to the field of lightning protection equipment technology, specifically disclosing a separable modular assembly lightning arrester, comprising: a zinc oxide element, which is a columnar structure, the zinc oxide element having two sections, with a connecting gasket between the two sections; a connecting electrode abutting at the top of the column formed by the two zinc oxide elements, and a grounding terminal abutting at the bottom of the column. This separable modular assembly lightning arrester adopts a modular assembly structure, with the top connecting flange and porcelain sleeve engaging with a mounting plate via an annular groove, and the porcelain sleeve and bottom connecting flange also engaging. It can be disassembled into multiple independent components, allowing for single-person handling and positioning in narrow switchgear or high-altitude power transmission towers, avoiding the safety hazards of hoisting operations, reducing manpower input, lowering labor costs, and reducing installation difficulty in confined spaces, thus reducing construction costs and risks.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection equipment technology, specifically to a separable, modularly assembled lightning arrester. Background Technology

[0002] Surge arresters are core overvoltage limiting devices in power systems, communications, and construction. Their known basic structure consists of a metal oxide resistive element as the core, combined with an insulating jacket, upper and lower electrodes, and grounding components. They achieve overvoltage clamping and lightning current discharge through nonlinear volt-ampere characteristics and are widely used in high-voltage transmission and transformation towers, switchgear, building lightning protection systems, and new energy power plants. They can effectively reduce equipment damage caused by lightning disasters. Among them, composite jacket surge arresters are the most commonly used in various scenarios due to their good pollution resistance and light weight.

[0003] Most existing surge arresters adopt an integrated encapsulation structure. Due to the large size and weight of the integrated structure, it is difficult to hoist and position in confined spaces such as narrow switch cabinets or high-altitude power transmission towers. Special tooling is required, which increases the labor cost and safety risk of construction. Moreover, when a single resistor element fails, the entire surge arrester body needs to be replaced, which increases the material cost. Utility Model Content

[0004] The purpose of this utility model is to provide a separable, modularly assembled surge arrester to solve the problems mentioned in the background art, such as the large size and weight of the integrated structure, the difficulty of hoisting and positioning in confined spaces such as narrow switch cabinets or high-altitude power transmission towers, the need for special tooling, the increase in construction labor costs and safety risks, and the need to replace the entire surge arrester body when a single resistor element fails, which leads to increased material costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a separable modular surge arrester, including a zinc oxide element, which is a columnar structure, wherein the zinc oxide element is provided with two sections, and a connecting gasket is provided between the two sections of the zinc oxide element; The top of the column formed by the zinc oxide element described in Section 2 abuts against a connecting electrode, and the bottom of the column abuts against a grounding terminal. The top of the connecting electrode abuts against the top connecting electrode, and a wiring terminal is provided directly above the top connecting electrode. The wiring terminal is connected to the top connecting electrode through a connecting bracket, and the top connecting electrode is sleeved and installed inside the top connecting flange. The bottom end of the top connecting flange is embedded and engaged with the top plate of the porcelain sleeve through an annular groove. The outer wall of the porcelain sleeve is fitted with an insulating support skirt, and the inner wall of the porcelain sleeve is fitted with a column composed of zinc oxide elements. The top of the porcelain sleeve has an installation hole, which is welded and sealed to the edge of the inner explosion-proof membrane. The inner explosion-proof membrane covers the connection area between the connecting electrode and the top connecting electrode. The bottom end of the porcelain sleeve is engaged with a bottom connecting flange, and the bottom end of the bottom connecting flange is engaged with an insulating base. One end of the insulating base is provided with a grounding terminal, and the other end of the grounding terminal extends through the side wall of the insulating base.

[0006] By adopting the above technical solution, the device is assembled in a modular, snap-fit ​​configuration, and individual components can be disassembled and replaced, which reduces the difficulty of installation in confined spaces, reduces the overall replacement cost, and improves operation and maintenance efficiency.

[0007] Preferably, the connecting gasket is made of aluminum nitride ceramic material, and the diameter of the connecting gasket is the same as the diameter of the zinc oxide element.

[0008] Using the above technical solution, the diameter of the aluminum nitride gasket is the same as that of the zinc oxide element, which firmly supports the coaxiality of the element, strengthens axial insulation, and ensures operational stability.

[0009] Preferably, the bottom end of the connecting bracket is provided with an insulating rubber ring, and the insulating rubber ring is made of fluororubber.

[0010] By adopting the above technical solution, the connecting bracket is equipped with a fluororubber insulating ring, which specifically improves the insulation performance of the top connection area and builds a solid insulation protection barrier.

[0011] Preferably, the inner ring of the insulating rubber ring is interference-fitted with the outer peripheral wall of the top connecting electrode, and the outer ring of the insulating rubber ring is interference-fitted with the top surface of the top connecting flange.

[0012] The above technical solution employs a double interference fit for the insulating ring, enhancing the sealing effect, effectively blocking surface discharge paths, and improving insulation reliability.

[0013] Preferably, the explosion-proof film is made of aluminum foil, and the edge of the explosion-proof film is sealed to the mounting hole of the ceramic sleeve by welding.

[0014] The above technical solution uses aluminum foil explosion-proof film welding and sealing to accurately respond to internal pressure, release pressure in time to avoid porcelain sleeve cracking, and ensure operational safety.

[0015] Preferably, the bottom of the inner wall of the insulating base is provided with a support seat, and an insulating washer is fixed at the top of the support seat, and the insulating washer has a C-shaped structure.

[0016] By adopting the above technical solution, the support base is equipped with a C-shaped washer, which positions the grounding terminal and simultaneously stabilizes the bottom flange, improving the accuracy of installation positioning.

[0017] Preferably, the opening of the insulating washer is penetrated by a grounding terminal, and the top of the insulating washer abuts against the inner wall of the bottom connecting flange.

[0018] The above technical solution allows the gasket opening to be adapted to the grounding terminal, which not only provides positioning but also ensures the accuracy of flange support and component repositioning after disassembly and assembly.

[0019] Compared with the prior art, the beneficial effects of this utility model are: the separable modular surge arrester: 1. This surge arrester adopts a modular assembly structure. The top connecting flange and the porcelain bushing are embedded and engaged with the mounting plate through an annular groove. The porcelain bushing and the bottom connecting flange are also engaged. It can be disassembled into multiple independent parts. In narrow switch cabinets or high-altitude power transmission towers, a single person can complete the handling and positioning, avoiding the safety hazards of hoisting operations. At the same time, it reduces the input of construction manpower, reduces labor costs, and reduces the difficulty of installation in confined spaces, thereby reducing construction costs and risks. 2. Furthermore, the zinc oxide element is set in two sections, which, together with the connecting electrode and connecting gasket, form an independent functional unit. The explosion-proof membrane, connecting gasket and other vulnerable parts can be disassembled separately. When a single section of zinc oxide element or explosion-proof membrane fails, only the snap-fit ​​structure needs to be disassembled and the corresponding part replaced. There is no need to replace the entire surge arrester body, which effectively reduces the number of scrapped parts and reduces material waste and replacement costs. 3. The fluororubber insulating ring at the bottom of the connecting bracket is reinforced with an interference fit to enhance insulation. The insulating support skirt on the outer wall of the porcelain bushing improves the external insulation performance. The support seat and C-shaped insulating washer inside the insulating base position the grounding terminal and support the bottom connecting flange, ensuring accurate repositioning of components after disassembly and assembly. At the same time, the aluminum foil explosion-proof film accurately relieves pressure, preventing the porcelain bushing from cracking, and comprehensively ensuring operational stability and safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the overall internal side section of the present invention. Figure 3 This is a schematic diagram of the overall internal three-dimensional structure of this utility model; Figure 4 This is a schematic diagram of the overall internal disassembled three-dimensional structure of this utility model; Figure 5 A three-dimensional structural diagram of the zinc oxide element, top connecting electrode, and grounding terminal of this utility model; Figure 6 This is a three-dimensional structural diagram showing the disassembled insulating base, support, insulating washer, and grounding terminal of this utility model.

[0021] In the diagram: 1. Zinc oxide element; 2. Connecting gasket; 3. Connecting electrode; 4. Top connecting electrode; 5. Terminal block; 6. Connecting bracket; 7. Insulating rubber ring; 8. Top connecting flange; 9. Explosion-proof membrane; 10. Porcelain sleeve; 11. Insulating support skirt; 12. Bottom connecting flange; 13. Insulating base; 14. Support base; 15. Insulating washer; 16. Grounding terminal. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6 This utility model provides a technical solution: a separable modular surge arrester, including a zinc oxide element 1, a connecting gasket 2, a connecting electrode 3, a top connecting electrode 4, a terminal block 5, a connecting bracket 6, an insulating rubber ring 7, a top connecting flange 8, an explosion-proof membrane 9, a porcelain sleeve 10, an insulating support skirt 11, a bottom connecting flange 12, an insulating base 13, a support seat 14, an insulating washer 15, and a grounding terminal 16; Among them, the zinc oxide element 1 is a columnar structure, and the zinc oxide element 1 is provided with two sections, and a connecting gasket 2 is provided between the two sections of zinc oxide element 1; The connecting gasket 2 is made of aluminum nitride ceramic material, and the diameter of the connecting gasket 2 is the same as the diameter of the zinc oxide element 1. The top of the column formed by the two zinc oxide elements 1 abuts against the connecting electrode 3, and the bottom of the column abuts against the grounding terminal 16. The top of the connecting electrode 3 abuts against the top connecting electrode 4, and a wiring terminal 5 is provided directly above the top connecting electrode 4. The wiring terminal 5 is connected to the top connecting electrode 4 through the connecting bracket 6, and the top connecting electrode 4 is sleeved and installed in the top connecting flange 8. An insulating rubber ring 7 is provided at the bottom of the connecting bracket 6, and the insulating rubber ring 7 is made of fluororubber material. The inner ring of the insulating rubber ring 7 is interference-fitted with the outer peripheral wall of the top connecting electrode 4, and the outer ring of the insulating rubber ring 7 is interference-fitted with the top surface of the top connecting flange 8. Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, first fix the support base 14 to the bottom of the inner wall of the insulating base 13, put on the C-shaped insulating washer 15, pass one end of the grounding terminal 16 through the opening of the insulating washer 15 and fix it inside the insulating base 13, then snap the bottom connecting flange 12 into the top of the insulating base 13, and snap the bottom end of the porcelain sleeve 10 into the bottom connecting flange 12. The outer wall of the porcelain sleeve 10 has a pre-set insulating support umbrella skirt 11 that can be directly adapted. Place one section of zinc oxide element 1 into the ceramic sleeve 10, place the connecting gasket 2 on the top, and then stack another section of zinc oxide element 1 to form a vertical column with its bottom end abutting the grounding terminal 16. The top end of the column abuts the connecting electrode 3, and the top end of the connecting electrode 3 aligns with the top connecting electrode 4. Slide the top connecting electrode 4 onto the top connecting flange 8, and after putting an insulating rubber ring 7 on the bottom end of the connecting bracket 6, connect the terminal 5 to the top connecting electrode 4. Finally, engage the top connecting flange 8 with the ceramic sleeve 10, and weld the sealing explosion-proof membrane 9 to cover the connection point of the connecting electrode 3 to complete the installation. The bottom end of the top connecting flange 8 is embedded and engaged with the top plate of the porcelain sleeve 10 through an annular groove. The outer wall of the porcelain sleeve 10 is fitted with an insulating support skirt 11, and the inner wall of the porcelain sleeve 10 is fitted with a column composed of zinc oxide element 1. The top of the porcelain sleeve 10 has an installation hole, which is welded and sealed to the edge of the inner explosion-proof membrane 9. The inner explosion-proof membrane 9 covers the connection area between the connecting electrode 3 and the top connecting electrode 4. The bottom end of the porcelain sleeve 10 is engaged with a bottom connecting flange 12, and the bottom end of the bottom connecting flange 12 is engaged with an insulating base 13. One end of the grounding terminal 16 is provided inside the insulating base 13, and the other end of the grounding terminal 16 extends through the side wall of the insulating base 13. The bottom end of the inner wall of the insulating base 13 is provided with a support seat 14, and the top of the support seat 14 is fixed with an insulating washer 15. The insulating washer 15 has a C-shaped structure, and the opening of the insulating washer 15 is penetrated by the grounding terminal 16. The top of the insulating washer 15 abuts against the inner wall of the bottom connecting flange 12. Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, during normal operation, the zinc oxide element 1 maintains insulation, the connecting gasket 2 ensures the coaxiality of the column, the porcelain sleeve 10 and the insulating support skirt 11 strengthen the external insulation, the insulating rubber ring 7 prevents surface discharge, and the wiring terminal 5 and the top connecting electrode 4 remain conductive and ready for operation. When a power system encounters lightning overvoltage or switching overvoltage, the voltage amplitude exceeds the threshold voltage of the zinc oxide element 1, its nonlinear volt-ampere characteristic is activated, the resistance value drops sharply, forming a low-resistance conductive channel. The lightning current generated by the overvoltage is input through the terminal 5, conducted through the connecting bracket 6 to the top connecting electrode 4, and then shunted through the connecting electrode 3 to the two series-connected zinc oxide elements 1. The current is quickly discharged when flowing through the zinc oxide element 1, and at the same time, the element clamps the overvoltage to a safe level, protecting the insulation of downstream equipment. Finally, the discharged current is conducted to the ground through the grounding terminal 16 at the bottom of the zinc oxide element 1 column, completing the overvoltage protection closed loop. During this process, the connecting gasket 2 ensures that the two zinc oxide elements 1 are subjected to uniform force and reliable conductive contact, avoiding local current concentration that could damage the element. When the pressure reaches the set threshold, the aluminum foil explosion-proof membrane 9 at the mounting hole at the top of the ceramic sleeve 10 breaks, quickly releasing the internal pressure and preventing the ceramic sleeve 10 from exploding or components from flying. The explosion-proof membrane 9 covers the connection area between the connecting electrode 3 and the top connecting electrode 4, which does not affect normal conductivity and can accurately respond to changes in internal pressure, thus improving the safety of equipment operation. When modular disassembly and maintenance equipment requires repair or replacement of components, the locking structure between the top connecting flange 8 and the porcelain sleeve 10, and between the porcelain sleeve 10 and the bottom connecting flange 12, can be directly disassembled. The porcelain sleeve 10 can be opened without special tools. By replacing a single failed zinc oxide element 1 or a damaged connecting gasket 2, explosion-proof membrane 9, etc., the entire surge arrester does not need to be replaced, reducing maintenance costs. The support seat 14 at the bottom of the inner wall of the insulating base 13 and the top C-shaped insulating washer 15 not only achieve the positioning of the grounding terminal 16 through the opening of the insulating washer 15, but also provide stable support for the bottom connecting flange 12, ensuring that each component can still be accurately reset after disassembly and assembly, and ensuring stable conductivity and insulation performance.

[0024] Working principle: When using this separable modular surge arrester, the columnar zinc oxide element 1 is the core insulating component. The two elements are vertically positioned and reinforced with axial insulation by the connecting gasket 2. The porcelain sleeve 10 is fitted onto the element column. The outer wall insulating support skirt 11 increases the creepage distance. The insulating rubber ring 7 between the top connecting electrode 4 and the connecting bracket 6 prevents surface discharge. The wiring terminal 5 and the top connecting electrode 4 remain conductive and ready. The grounding terminal 16 is waiting for current discharge. The overall insulation is reliable. When the voltage is abnormal, the resistance of zinc oxide element 1 drops sharply. The lightning current is conducted to the ground through terminal 5, top connecting electrode 4, connecting electrode 3, zinc oxide element 1 and grounding terminal 16, clamping the voltage protection equipment. When zinc oxide element 1 heats up abnormally, the explosion-proof membrane 9 at the top of the porcelain sleeve 10 breaks to release pressure and prevent the porcelain sleeve 10 from exploding. During maintenance, the cover can be opened by disassembling the locking structure between the top connecting flange 8 and the porcelain sleeve 10, and the bottom connecting flange 12. No complete replacement is required; only the failed zinc oxide element 1 or the explosion-proof film 9 needs to be replaced. The inner support seat 14 of the insulating base 13 and the C-shaped insulating washer 15 ensure the accurate repositioning of the grounding terminal 16 and all components. Maintenance is efficient and cost-effective, increasing the overall practicality.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A separable, modularly assembled surge arrester, comprising: Zinc oxide element (1) has a columnar structure. The zinc oxide element (1) is provided with two sections, and a connecting gasket (2) is provided between the two sections of zinc oxide element (1). The feature is that: the top of the column formed by the zinc oxide element (1) in section 2 is connected to the connecting electrode (3), and the bottom of the column is connected to the grounding terminal (16). The top of the connecting electrode (3) is connected to the top connecting electrode (4), and a wiring terminal (5) is provided directly above the top connecting electrode (4). The wiring terminal (5) is connected to the top connecting electrode (4) through the connecting bracket (6), and the top connecting electrode (4) is sleeved and installed in the top connecting flange (8). The bottom end of the top connecting flange (8) is embedded and engaged with the top plate of the porcelain sleeve (10) through an annular groove. The outer wall of the porcelain sleeve (10) is fitted with an insulating support umbrella skirt (11). The inner wall of the porcelain sleeve (10) is fitted with a column composed of zinc oxide elements (1). The top end of the porcelain sleeve (10) has an installation hole, which is welded and sealed to the edge of the inner explosion-proof membrane (9). The inner explosion-proof membrane (9) covers the connection area between the connecting electrode (3) and the top connecting electrode (4). The bottom end of the porcelain sleeve (10) is engaged with a bottom connecting flange (12), and the bottom end of the bottom connecting flange (12) is engaged with an insulating base (13). The insulating base (13) has one end of a grounding terminal (16) inside, and the other end of the grounding terminal (16) extends through the side wall of the insulating base (13).

2. The separable modular surge arrester according to claim 1, characterized in that: The connecting gasket (2) is made of aluminum nitride ceramic material, and the diameter of the connecting gasket (2) is the same as the diameter of the zinc oxide element (1).

3. The separable modular surge arrester according to claim 1, characterized in that: The bottom of the connecting bracket (6) is provided with an insulating rubber ring (7), and the insulating rubber ring (7) is made of fluororubber.

4. A separable, modularly assembled surge arrester according to claim 3, characterized in that: The inner ring of the insulating rubber ring (7) is interference-fitted with the outer peripheral wall of the top connecting electrode (4), and the outer ring of the insulating rubber ring (7) is interference-fitted with the top surface of the top connecting flange (8).

5. A separable, modularly assembled surge arrester according to claim 1, characterized in that: The explosion-proof film (9) is made of aluminum foil, and the edge of the explosion-proof film (9) is sealed to the mounting hole of the ceramic sleeve (10) by welding.

6. A separable, modularly assembled surge arrester according to claim 1, characterized in that: The bottom of the inner wall of the insulating base (13) is provided with a support seat (14), and an insulating washer (15) is fixed at the top of the support seat (14), and the insulating washer (15) has a C-shaped structure.

7. A separable, modularly assembled surge arrester according to claim 6, characterized in that: The opening of the insulating gasket (15) is penetrated by the grounding terminal (16), and the top of the insulating gasket (15) abuts against the inner wall of the bottom connecting flange (12).

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