Composite outer sleeve gapless surge arrester

Abstract

This utility model discloses a gapless surge arrester with a composite jacket, including an arrester housing, with a gapless composite jacket disposed on the outer wall of the arrester housing, and an end cap connected to the end of the gapless composite jacket. This gapless surge arrester with a composite jacket exhibits stable performance and strong adaptability. The gapless design avoids problems such as unstable discharge and aging that may occur with traditional gap structures. Combined with the excellent nonlinear volt-ampere characteristics of the resistor element in the Durriton core, it can quickly and stably switch between normal voltage and overvoltage states, ensuring consistent protection performance. Simultaneously, the gapless composite jacket made of silicone rubber is formed by one-time molding and vulcanization, tightly bonded to the core without gaps, effectively preventing moisture and dust intrusion. Furthermore, the umbrella-shaped structure increases the creepage distance, providing outstanding resistance to pollution flashover and aging, enabling long-term reliable operation in various harsh environments, significantly improving the environmental adaptability and service life of the surge arrester.

Description

Technical Field

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

[0002] A surge arrester is an electrical device used to protect electrical equipment from the hazards of high transient overvoltages during lightning strikes and to limit the duration and amplitude of follow current. Surge arresters are sometimes also called overvoltage protectors or overvoltage limiters.

[0003] Traditional surge arresters have some shortcomings. In some harsh environments, such as high humidity and heavily polluted areas, the insulation performance of traditional surge arresters may be severely affected, leading to a decrease in their reliability. With the continuous development of power systems, the performance requirements for surge arresters are becoming increasingly stringent, necessitating a surge arrester that can adapt to complex environments, has stable performance, and provides good protection.

[0004] Therefore, it is necessary to provide a composite jacket gapless surge arrester to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a composite jacket gapless surge arrester to solve the problems existing in the background technology. The technical solution of this utility model addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a composite jacket gapless surge arrester, comprising a surge arrester housing, the outer wall of the surge arrester housing being provided with a gapless composite jacket, the end of the gapless composite jacket being connected to an end cap, and a Durand core being provided inside the surge arrester housing.

[0007] Preferably, the seamless composite jacket is provided with umbrella-shaped structures at equal intervals, and the umbrella-shaped structures have two sets of sizes that are staggered.

[0008] Preferably, the Duraton core includes a lower electrode and an upper electrode disposed at both ends, a resistive sheet and an aluminum pad are disposed between the lower electrode and the upper electrode, and the resistive sheet and the aluminum pad are arranged alternately.

[0009] Preferably, both the lower electrode and the upper electrode are provided with a cross screw that penetrates the end cover, and a nut is installed on the outer wall of the end of the cross screw that extends to the outside of the end cover.

[0010] Preferably, the gapless composite jacket is made of silicone rubber material.

[0011] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model presents a gapless surge arrester with a composite jacket, exhibiting stable performance and strong adaptability. The gapless design avoids problems such as unstable discharge and aging that may occur with traditional gap structures. Combined with the excellent nonlinear volt-ampere characteristics of the resistor element in the Durriton core, it can quickly and stably switch between normal and overvoltage states, ensuring consistent protection performance. Simultaneously, the gapless composite jacket made of silicone rubber is formed through a single molding and vulcanization process, tightly bonded to the core without gaps, effectively preventing moisture and dust intrusion. Furthermore, the umbrella-shaped structure increases the creepage distance, providing outstanding resistance to flashover and aging, enabling long-term reliable operation in various harsh environments, significantly improving the environmental adaptability and service life of the surge arrester. This utility model's surge arrester offers significant protection and boasts a robust structure. The alternating arrangement of the resistance elements and aluminum gaskets significantly enhances its high-current surge withstand capability, enabling it to quickly conduct and safely discharge large currents during overvoltage events, limiting the overvoltage to a safe range and providing reliable protection for electrical equipment. Furthermore, the lower and upper electrodes are die-cast from molten aluminum ingots, eliminating pores and reducing weight, thus minimizing the tensile stress on the arrester and improving operational safety. The combination of the cross screw and nut reinforces the connection between the end cap and the outer sleeve, ensuring a stable current conduction path. The overall structural robustness further enhances its operational reliability and reduces maintenance costs. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a front view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the gapless composite jacket of this utility model; Figure 4 This is a schematic diagram of the internal structure of the surge arrester housing of this utility model.

[0014] In the diagram: 1. Surge arrester housing; 2. Gapless composite jacket; 201. Umbrella-shaped structure; 3. End cap; 4. Duratin core; 5. Lower electrode; 6. Upper electrode; 7. Resistor element; 8. Aluminum gasket; 9. Phillips head screw; 10. Nut. Detailed Implementation

[0015] 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.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will be described below based on its overall structure.

[0017] Please see Figure 1-4 A composite jacket gapless surge arrester includes a surge arrester housing 1, a gapless composite jacket 2 provided on the outer wall of the surge arrester housing 1, an end cap 3 connected to the end of the gapless composite jacket 2, and a Durand core 4 provided inside the surge arrester housing 1.

[0018] like Figure 1-4 As shown, the gapless composite jacket 2 is provided with umbrella-shaped structures 201 at equal intervals. The umbrella-shaped structures 201 have two sets of sizes and are staggered. The surface of the gapless composite jacket 2 is designed with multiple umbrella-shaped structures 201, which increases the creepage distance and further improves the insulation performance. The shape and size of the umbrella-shaped structures 201 are optimized to ensure sufficient creepage distance and effectively prevent rainwater from forming a continuous conductive path under severe weather conditions such as wind and rain, thereby enhancing the operational reliability of the surge arrester in harsh environments.

[0019] like Figure 1-4 As shown, the Duraton core 4 includes a lower electrode 5 and an upper electrode 6 disposed at both ends. A resistor 7 and an aluminum gasket 8 are disposed between the lower electrode 5 and the upper electrode 6, and the resistor 7 and the aluminum gasket 8 are staggered. The lower electrode 5 and the upper electrode 6 are die-cast into the mold cavity after the aluminum ingot is melted, without air holes, which will not cause poor sealing. The electrodes produced by high pressure casting are lighter than those processed from steel, the surge arrester bears less tensile force, and the surge arrester operates more safely and reliably. By adding aluminum gaskets 8 between the resistors 7, the surge arrester's high current impulse withstand capability is greatly improved.

[0020] like Figure 1-4As shown, both the lower electrode 5 and the upper electrode 6 are provided with cross screws 9 that penetrate the end cover 3. A nut 10 is installed on the outer wall of the end of the cross screw 9 that extends to the outside of the end cover 3. The connection between the end cover 3 and the gapless composite jacket 2 is reinforced by the thread structure between the nut 10 and the cross screw 9.

[0021] like Figure 1-4 As shown, the gapless composite jacket 2 is made of silicone rubber material. Silicone rubber material has excellent electrical insulation properties and high dielectric strength, which can effectively isolate the core from the external environment and prevent problems such as leakage and short circuit. Furthermore, the gapless composite jacket 2 adopts a one-time molding and vulcanization process, which tightly integrates it with the core into a whole without gaps. This greatly improves the sealing performance of the surge arrester and effectively prevents external moisture, dust and other impurities from entering the interior and affecting the normal operation of the core.

[0022] Working Principle: During normal operation of the power system, the voltage is within the normal range. At this time, the Duretton core in the surge arrester plays a crucial role. The resistive element in the Duretton core has excellent nonlinear volt-ampere characteristics, exhibiting a high resistance state under normal operating voltage. This makes it difficult for current to pass through the resistive element, keeping the surge arrester in an insulated state and preventing any impact on the normal power transmission of the power system, ensuring that power can be stably delivered to various electrical equipment. When the power system encounters overvoltage conditions, such as atmospheric overvoltage or switching overvoltage, the overvoltage signal will quickly act on the surge arrester. At this time, the resistance value of the resistor will drop sharply, changing from a high resistance state to a low resistance state. This change will cause the surge arrester to conduct instantly, forming a low impedance path. The large current generated by overvoltage passes sequentially through the upper electrode, resistive element, aluminum pad, and lower electrode. The presence of the aluminum pad significantly improves the surge arrester's high-current impulse withstand capability, ensuring stable operation of all components during high-current flow and preventing damage due to excessive current. The current is conducted to the end cover via the cross screw and finally discharged to the ground through the line connected to the end cover, thereby limiting the overvoltage to a safe range that the electrical equipment can withstand and protecting it from damage. When the overvoltage disappears, the resistance value of the resistor can quickly return to a high resistance state, the surge arrester returns to the insulation state, and the power system resumes normal operation. Furthermore, the gapless composite jacket plays a crucial supporting role throughout the entire operation. Made of silicone rubber and bonded tightly to the core through a one-time molding and vulcanization process, its seamless structure effectively prevents external moisture, dust, and other impurities from intruding, ensuring stable operation of the core in various environments. Simultaneously, the umbrella-shaped structure on the surface of the gapless composite jacket increases the creepage distance, further improving insulation performance. In severe weather conditions such as wind and rain, it effectively prevents rainwater from forming a continuous conductive path, ensuring the reliability of the surge arrester in harsh environments and providing excellent external environmental protection for the normal operation of the entire surge arrester. The combination of the cross screw and nut strengthens the connection between the end cap and the gapless composite sleeve, ensuring the stability of the current conduction path and ensuring that the current can be discharged smoothly. It also enhances the overall structural stability of the surge arrester, enabling the surge arrester to operate reliably under various working conditions.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A composite-jacketed gapless surge arrester, comprising an arrester housing (1), characterized in that: The outer wall of the surge arrester housing (1) is provided with a gapless composite jacket (2), the end of the gapless composite jacket (2) is connected with an end cap (3), and the inside of the surge arrester housing (1) is provided with a Durand core (4).

2. The composite jacket gapless surge arrester according to claim 1, characterized in that: The seamless composite jacket (2) is provided with umbrella-shaped structures (201) at equal intervals. The umbrella-shaped structures (201) have two sets of sizes and are arranged alternately.

3. The composite jacket gapless surge arrester according to claim 1, characterized in that: The Durton core (4) includes a lower electrode (5) and an upper electrode (6) disposed at both ends. A resistor (7) and an aluminum pad (8) are disposed between the lower electrode (5) and the upper electrode (6), and the resistor (7) and the aluminum pad (8) are arranged alternately.

4. A composite jacketed gapless surge arrester according to claim 3, characterized in that: Both the lower electrode (5) and the upper electrode (6) are provided with a cross screw (9) that penetrates the end cap (3). A nut (10) is installed on the outer wall of one end of the cross screw (9) that extends to the outside of the end cap (3).

5. A composite jacketed gapless surge arrester according to claim 1, characterized in that: The gapless composite jacket (2) is made of silicone rubber material.

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