A fast-response surge arrester

Abstract

A fast-response surge arrester includes a housing, an upper end cover, a lower end cover, terminals, heat dissipation fins, and conductive components. The upper and lower end covers are located at opposite ends of the housing. The terminals are located on the outer side of the end covers, and the heat dissipation fins are located on the outer wall of the housing. The conductive components are housed inside the housing and include electrodes, annular zinc oxide valve plates, and conductive gaskets with a beryllium copper alloy nickel-gold plating. The valve plates are fitted with electrodes and spaced axially, and the conductive gaskets are sandwiched between adjacent valve plates and in close contact. The valve plates and conductive gaskets are fixed by fixing pins. Adjacent valve plates are coated with conductive silver paste, and electrode terminals at both ends of the valve plates connect to the terminals. A sealing ring is provided between the end cover and the housing. This invention can quickly form a conductive path, improve response speed, and simultaneously provide efficient heat dissipation, sealing, and moisture protection, ensuring stable operation.

Description

Technical Field

[0001] This utility model relates to the field of power system lightning protection equipment technology, specifically to a fast-response surge arrester, which is suitable for lightning overvoltage protection of high-voltage transmission lines, substations and power distribution equipment of different voltage levels, and is especially suitable for scenarios that require fast response to cope with overvoltage discharge under instantaneous strong thunderstorm weather. Background Technology

[0002] Existing surge arresters have shortcomings in response speed. Their conductive path typically requires multiple layers of metal electrodes and valve plates in overlapping contact. The contact resistance between the electrodes and valve plates can easily lead to conduction delay. When encountering steep overvoltage waves, they often fail to effectively protect the protected equipment due to untimely response, potentially causing insulation breakdown and other problems. Traditional surge arresters also have deficiencies in heat dissipation design. During overvoltage discharge, the valve plates generate a large amount of heat instantaneously, and the sealed shell design makes it difficult for the heat to dissipate. Heat accumulation not only reduces the nonlinear conduction performance of the valve plates but may also cause thermal breakdown, further prolonging the subsequent response time and affecting the normal operation of the surge arrester. Furthermore, current surge arresters have limitations in structural fixation. Their conductive structure is mostly a fixed integrated design, which cannot flexibly adjust the relevant parameters of the conductive path according to the line requirements of different voltage levels. This results in the same surge arrester being only suitable for a single voltage scenario, with poor versatility, high replacement costs, and inconvenience in practical applications.

[0003] Therefore, a fast-response surge arrester needs to be designed to solve the problems mentioned above. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing surge arresters, such as slow response speed, insufficient conductivity stability, poor heat dissipation, and inconvenient maintenance, and to provide a fast-response surge arrester. By optimizing the conductive structure and heat dissipation design, it can achieve rapid discharge of overvoltage, while improving the stability and versatility of the equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A fast-response surge arrester includes a housing, an upper cover, a lower cover, terminals, heat dissipation fins, and conductive components. The upper and lower covers are respectively disposed at the upper and lower ends of the housing, forming a closed internal space. The terminals are respectively disposed on the side of the upper and lower covers away from the housing for connection to external lines. The heat dissipation fins are disposed on the outer wall of the housing to accelerate the dissipation of heat inside the housing. The conductive components are disposed inside the housing, serving as the core path for overvoltage discharge.

[0007] Furthermore, the conductive component includes electrodes, valve plates, and conductive pads. The electrodes are coaxially disposed inside the housing, serving as the central carrier of the conductive path. The valve plates are annular zinc oxide valve plates, with multiple sets disposed, all sleeved on the outside of the electrodes, and spaced apart along the electrode axis. The nonlinear resistance characteristics of zinc oxide material are used to achieve rapid conduction of overvoltage. The conductive pads are made of beryllium copper alloy, and their surfaces are plated with a nickel-gold layer. The conductive pads are sandwiched between two adjacent valve plates, and the conductive pads are in close contact with the valve plates on both sides, ensuring the continuity of conductivity between the valve plates and maintaining stable contact pressure through elastic properties, thereby reducing contact resistance.

[0008] Furthermore, the valve plate and the conductive pad are fixed together by fixing pins. The electrodes, valve plates and conductive pads are stacked and fixed in sequence by fixing pins to ensure the stability of the conductive component structure and avoid the component from loosening due to vibration or impact.

[0009] Furthermore, conductive silver paste is coated between adjacent valve plates to further reduce the contact resistance between valve plates, improve conductivity continuity, reduce conduction delay, and ensure that a discharge path can be formed instantaneously when an overvoltage occurs.

[0010] Furthermore, electrode terminals are respectively provided at the upper and lower ends of the valve plate, and the electrode terminals are respectively connected to the wiring terminals of the upper end cover and the lower end cover to form a complete conductive circuit from the external circuit to the conductive component, ensuring the smooth conduction of current.

[0011] Furthermore, sealing rings are provided between the upper end cover and the outer shell, and between the lower end cover and the outer shell. Through the sealing effect of the sealing rings, the overall sealing performance of the surge arrester is enhanced, effectively preventing external moisture, dust, etc. from entering the interior and avoiding affecting the performance of the conductive components.

[0012] Furthermore, there are multiple heat dissipation fins, which are evenly distributed along the circumference of the outer shell. By increasing the contact area between the outer shell and the air, the heat dissipation from the inside of the outer shell to the external environment is accelerated, preventing the valve plate from reducing its response speed or being damaged due to overheating.

[0013] Through the above-mentioned structural design, this utility model organically combines functions such as fast response, stable conductivity, efficient heat dissipation and reliable sealing, which can effectively improve the lightning protection effect of surge arresters in lines with different voltage levels, while also having the characteristics of convenient maintenance and wide applicability.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model, through the design of a fast-response surge arrester, achieves the following effects: 1. By using conductive pads made of beryllium copper alloy with a nickel-gold plating, sandwiched between adjacent valve plates and in close contact, the contact resistance between the electrodes and valve plates is effectively reduced, ensuring instantaneous conduction of the conductive path when overvoltage occurs. This solves the response delay problem caused by contact resistance in traditional surge arresters, enabling rapid response to steep-wave overvoltages; 2. Multiple circumferentially evenly distributed heat dissipation fins are provided on the outer wall of the housing, increasing the heat dissipation area and accelerating heat dissipation. This avoids the heat accumulation problem caused by traditional sealed housing designs, preventing valve plates from degrading in performance or undergoing thermal breakdown due to overheating, thus ensuring the stable operation of the surge arrester; 3. Sealing rings are provided between the upper end cover and the housing, and between the lower end cover and the housing, enhancing the overall sealing performance of the surge arrester. This effectively prevents moisture intrusion, avoiding the impact of moisture on the conductivity and service life of internal components, and improving the surge arrester's performance in different environments. Applicability; 4. Conductive silver paste is coated between adjacent valve plates, further improving the conductivity continuity between valve plates, reducing obstacles during conduction, and reducing conduction delay. At the same time, the electrodes, valve plates, and conductive pads are fixedly stacked by fixing pins, ensuring the stability of the conductive component structure and ensuring reliable operation of the conductive path; 5. The electrode terminals at the upper and lower ends of the valve plates are connected to the wiring terminals of the upper and lower end covers, respectively, forming a stable conductive connection path, reducing contact resistance and signal loss at the connection points, and ensuring smooth current conduction during overvoltage discharge; 6. All parts of the conductive component are fixed by fixing pins. The reasonable structural design facilitates the later inspection, maintenance, or replacement of internal components such as electrodes, valve plates, and conductive pads, reducing maintenance costs and difficulty; 7. The overall structural design can adapt to different working environments and voltage scenarios. Through reasonable structural configuration, it can meet the lightning protection requirements of various voltage level lines, improving the versatility and practicality of the surge arrester. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A schematic diagram of the planar structure;

[0018] Figure 3 This utility model Figure 1 A schematic diagram of the planar structure from another perspective;

[0019] Figure 4 This is a schematic diagram of the planar structure of the conductive component of this utility model.

[0020] In the diagram: 1. Outer shell; 2. Upper end cover; 3. Lower end cover; 4. Terminal block; 5. Heat sink fins; 6. Conductive component; 61. Electrode; 62. Valve plate; 63. Conductive gasket; 64. Fixing pin; 65. Electrode terminal; 7. Sealing ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0023] Example 1

[0024] Please see Figure 1 as well as Figure 2 This embodiment provides a fast-response surge arrester, including a housing 1, an upper end cover 2, a lower end cover 3, a terminal block 4, heat dissipation fins 5, and a conductive component 6. The upper end cover 2 and the lower end cover 3 are respectively disposed at the upper and lower ends of the housing 1. The terminal block 4 is respectively disposed on the side of the upper end cover 2 and the lower end cover 3 away from the housing 1 for connection to external lines. The heat dissipation fins 5 are disposed on the outer side wall of the housing 1, and there are multiple heat dissipation fins 5. The multiple heat dissipation fins 5 are evenly distributed along the circumference of the housing 1 to increase the heat dissipation area and improve the heat dissipation efficiency. The conductive component 6 is disposed inside the housing 1 and serves as the core component for overvoltage discharge.

[0025] Example 2

[0026] Please see Figure 3 as well as Figure 4 This embodiment, based on Embodiment 1, further defines the conductive component 6 as including an electrode 61, a valve plate 62, and a conductive pad 63. The electrode 61 is coaxially disposed inside the outer casing 1. Multiple annular zinc oxide valve plates 62 are provided, all sleeved on the outside of the electrode 61, and spaced apart along the axial direction of the electrode 61. The conductive pad 63 is made of beryllium copper alloy, and its surface is plated with a nickel-gold layer. The conductive pad 63 is sandwiched between two adjacent valve plates 62, and the conductive pad 63 is in close contact with the valve plates 62 on both sides, ensuring good conductivity while maintaining stable contact pressure through its own elasticity, thus reducing contact resistance.

[0027] Example 3

[0028] Please see Figure 4 Based on Embodiment 1, this embodiment further specifies that the valve plate 62 and the conductive pad 63 are fixed together by a fixing pin 64. The electrode 61, valve plate 62, and conductive pad 63 are sequentially stacked and fixed by the fixing pin 64 to ensure the stability of the conductive component 6 structure and prevent the component from loosening due to vibration or other factors during use. The adjacent valve plates 62 are coated with conductive silver paste to further improve the conductivity continuity between the valve plates 62, reduce conduction delay, and enable overvoltage to be discharged more quickly.

[0029] Example 4

[0030] Please see Figure 3 as well as Figure 4 Based on Embodiment 1, this embodiment further specifies that electrode terminals 65 are respectively provided at the upper and lower ends of the valve plate 62. The electrode terminals 65 are connected to the wiring terminals 4 of the upper end cover 2 and the lower end cover 3, respectively, to form a complete conductive circuit and ensure smooth current conduction. Sealing rings 7 are provided between the upper end cover 2 and the outer shell 1, and between the lower end cover 3 and the outer shell 1, to enhance the sealing performance of the surge arrester, prevent moisture intrusion, and avoid internal components from being affected by moisture.

[0031] The working process of this utility model is as follows: When using this fast-response surge arrester, the surge arrester is connected to the external high-voltage line through the wiring terminals 4 on the upper end cover 2 and the lower end cover 3. The conductive components 6 inside the outer shell 1 are in a standby state. The sealing rings 7 between the upper end cover 2 and the outer shell 1, and between the lower end cover 3 and the outer shell 1, keep the inside of the outer shell 1 sealed, preventing moisture and dust from entering the conductive components 6, and ensuring that the electrodes 61, valve plates 62, and conductive gaskets 63 are in a stable working environment. When the external line encounters lightning or other causes that generate overvoltage, the overvoltage signal is transmitted through the wiring terminals 4 to the electrode terminals 65 at both ends of the valve plate 62. Because valve plate 62 is an annular zinc oxide valve plate, it has non-linear resistance characteristics. Under the action of overvoltage, it quickly switches from a high resistance state to a low resistance state, initiating the overvoltage discharge process. After valve plate 62 switches to the low resistance state, the current is conducted through electrode terminal 65 to electrode 61 of conductive component 6. Because a beryllium copper alloy conductive pad 63 with a nickel-gold plated surface is sandwiched between adjacent valve plates 62, and the conductive pad 63 is in close contact with the valve plates 62 on both sides, and the conductive silver paste coated between adjacent valve plates 62 further reduces the contact resistance, the current can quickly form a continuous current through electrode 61, valve plate 62, and conductive pad 63. A conductive path is formed to avoid conduction delay. After a continuous conductive path is established, the large current generated by the overvoltage is rapidly discharged along the path of "external line - terminal 4 - electrode terminal 65 - conductive component 6 - electrode terminal 65 - terminal 4 - grounding terminal". During this process, the fixing pin 64 firmly fixes the electrode 61, valve plate 62, and conductive pad 63 and keeps them in a stacked state to prevent the components from loosening due to large current impact or vibration, ensuring the stability of the conductive path and avoiding interruption of current conduction. During the large current discharge process, the valve plate 62 will generate heat, which is transferred to the electrode through the conductive pad 63 in contact with the valve plate 62. 61, and then conducted to the outer casing 1; multiple heat dissipation fins 5 evenly distributed circumferentially on the outer wall of the outer casing 1 increase the heat dissipation area, quickly dissipating the heat absorbed by the outer casing 1 to the outside air, preventing the valve plate 62 from overheating and causing abnormal resistance characteristics, ensuring its subsequent response performance. When the overvoltage of the external line subsides and the voltage returns to the normal level, the resistance characteristics of the valve plate 62 are restored, switching from a low resistance state to a high resistance state, cutting off the conductive path, and stopping the current discharge; the conductive component 6 returns to the standby state, and the surge arrester re-enters the standby mode, waiting for the next overvoltage signal, and continuously providing lightning protection for the external line.

[0032] 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 fast response surge arrester, characterized by: The device includes a housing (1), an upper cover (2), a lower cover (3), a terminal block (4), heat dissipation fins (5), and a conductive component (6). The upper cover (2) and the lower cover (3) are respectively located at the upper and lower ends of the housing (1). The terminal block (4) is respectively located on the side of the upper cover (2) and the lower cover (3) away from the housing (1). The heat dissipation fins (5) are located on the outer side wall of the housing (1). The conductive component (6) is located inside the housing (1).

2. A fast response surge arrester according to claim 1, characterized in that: The conductive component (6) includes an electrode (61), a valve plate (62), and a conductive pad (63). The electrode (61) is coaxially disposed inside the outer shell (1). The valve plate (62) is an annular zinc oxide valve plate, and multiple sets are provided, all of which are sleeved on the outside of the electrode (61). The valve plates (62) are spaced apart along the axial direction of the electrode (61). The conductive pad (63) is made of beryllium copper alloy and its surface is plated with a nickel-gold layer. The conductive pad (63) is sandwiched between two adjacent valve plates (62) and the conductive pad (63) is in close contact with the valve plates (62) on both sides respectively.

3. A fast responding surge arrester according to claim 2, characterized in that: The valve plate (62) and the conductive pad (63) are fixed together by a fixing pin (64) to fix the electrode (61), the valve plate (62) and the conductive pad (63) so that the electrode (61), the valve plate (62) and the conductive pad (63) are stacked in sequence.

4. A fast responding surge arrester according to claim 3, characterized in that The adjacent valve pieces (62) are coated with conductive silver paste to improve the conductivity continuity between the valve pieces (62) and reduce the conduction delay.

5. A fast responding surge arrester according to claim 4, characterized in that: The valve plate (62) is provided with electrode terminals (65) at its upper and lower ends respectively. The electrode terminals (65) are connected to the wiring terminals (4) of the upper end cover (2) and the lower end cover (3) respectively.

6. A fast responding surge arrester according to claim 1, characterized in that: A sealing ring (7) is provided between the upper end cover (2) and the outer shell (1), and between the lower end cover (3) and the outer shell (1) to enhance the sealing performance of the surge arrester and prevent moisture intrusion.

7. The fast response surge arrester of claim 1, wherein: There are multiple heat dissipation fins (5), and the multiple heat dissipation fins (5) are evenly distributed along the circumference of the outer shell (1).

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