An insulator structure with comprehensive protection function

Abstract

The present invention discloses an insulator structure with comprehensive protection function, which belongs to the technical field of overhead line arresters. By respectively arranging a multi-gap lightning protection component and a current limiting component at both ends of the insulator body, and utilizing the nonlinear resistance characteristics of the current limiting component, the insulator structure can present a low resistance characteristic when being acted upon by an overvoltage, and present a high resistance characteristic under the subsequent power frequency current, thereby helping the lightning protection component to well realize the discharge of overcurrent and the blocking of power frequency current, and ensure the protection performance of the insulator structure. The insulator structure with comprehensive protection function of the present invention has a simple structure, is easy to set up and maintain, and utilizes the corresponding arrangement of the current limiting component and the lightning protection component, so that the insulator structure can present a good insulation effect and protection effect when being acted upon by an overvoltage of a distribution line or a lightning overvoltage, so that the insulator structure has strong environmental adaptability, can adapt to transmission lines in various environments, and has good application prospects and promotion value.

Description

Technical Field

[0001] The invention belongs to the technical field of overhead line arresters, and in particular relates to an insulator structure with comprehensive protection functions. Background Art

[0002] With the development of social economy, the coverage of overhead transmission lines is getting wider and wider, and they play an increasingly important role in industrial production and daily life. In overhead transmission lines, the application of insulators is often indispensable. They mainly play the role of supporting the conductors and preventing the current from returning to the ground. For the former, it is related to the stability of the conductor setting, and this stability should not fail due to changes in environmental and electrical load conditions; for the latter, it often affects the normal operation of the line. The so-called prevention of current returning to the ground means that the insulator can withstand the voltage of the line, and the insulator will not flash over due to overvoltage. The above two functions must usually be guaranteed, otherwise the operation of the overhead transmission line will be at great risk.

[0003] In the actual operation of overhead transmission lines, various special environmental phenomena are usually encountered, among which the most influential is lightning. When encountering lightning, the insulators of overhead transmission lines may flash over along the surface under the action of lightning overvoltage or lightning induced overvoltage, causing the line current to return to the ground and causing the line to trip, affecting the normal operation of the line. In recent years, accidents such as lightning tripping and insulator flashover have frequently occurred in AC overhead lines at home and abroad, causing huge economic losses and seriously threatening the safe operation of overhead lines.

[0004] At present, the insulators that are widely used often have a single function, and it is difficult to ensure the stability of their work when the environment and electrical load conditions change. They are poorly adaptable to extreme conditions such as lightning strikes, dirt, freezing and high altitudes. In addition, the line arresters currently used for transmission lines are complicated to install, difficult to maintain, and have extremely high application costs, which greatly increases the cost of setting up overhead transmission lines and affects the normal and reliable operation of overhead transmission lines. Summary of the invention

[0005] In response to one or more of the above defects or improvement needs of the prior art, the present invention provides an insulator structure with comprehensive protection function, which can effectively improve the ability of the insulator structure to withstand voltage, ensure the stable operation of the insulator structure under lightning conditions, and thus ensure the operating stability of the overhead transmission line.

[0006] To achieve the above object, the present invention provides an insulator structure with comprehensive protection function, characterized in that it comprises a metal upper accessory, a lightning protection component, an insulator body, a metal lower accessory, an upper hardware, a current limiting component and a lower hardware which are sequentially arranged along the axial direction;

[0007] The metal upper attachment is connected to the high voltage end of the power distribution line and is used to fix the line conductor;

[0008] The lightning protection component is in a disc structure, and a plurality of lightning protection electrodes are arranged at intervals along the circumferential direction inside the outer periphery thereof, and an air chamber connected to the outer periphery of the disc structure is opened between two adjacent lightning protection components to form a circumferentially continuous inner electrode structure;

[0009] The two ends of the insulator body are respectively connected to the lightning protection component and the metal lower attachment, and the metal lower attachment and the current limiting component are connected through the upper hardware;

[0010] External electrodes are respectively arranged on the outer circumference of the metal upper attachment, on the end surfaces of both sides of the lightning protection component and on the outer circumference of the metal lower attachment, the external electrodes include conductors and fixing posts, the conductors are fixed at corresponding positions by fixing posts, and there is a certain distance between the two conductors on the same side, and the two external electrodes connected to the lightning protection component are respectively connected to the head and tail ends of the internal electrode structure;

[0011] The current limiting component is a nonlinear resistor, and one end of the current limiting component that is away from the upper hardware is connected to the lower hardware so as to be connected to the cross arm of the line tower through the lower hardware.

[0012] As a further improvement of the present invention, the outer diameter of the disc structure is 200-400 mm.

[0013] As a further improvement of the present invention, the current limiting component is made of conductive silicone and has a resistance value of 3-20Ω.

[0014] As a further improvement of the present invention, the aperture of the air chamber is 3 to 15 mm.

[0015] As a further improvement of the present invention, the conductor is in a spherical, hemispherical or cylindrical shape.

[0016] As a further improvement of the present invention, the conductor is made of copper or stainless steel.

[0017] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0018] In general, the above technical solution conceived by the present invention has the following beneficial effects compared with the prior art:

[0019] (1) The insulator structure with comprehensive protection function of the present invention, by respectively arranging a multi-gap lightning protection component and a current limiting component at both ends of the insulator body, can present a low resistance characteristic when the insulator structure is subjected to overvoltage, thereby realizing smooth discharge of overcurrent, and present a high resistance characteristic under subsequent power frequency current, thereby limiting the amplitude and steepness of the power frequency current, helping the lightning protection component to better block the passage of the power frequency current, realizing the extinguishing of the power frequency continuous current, improving the insulation capacity of the insulator structure, achieving a better protection effect, and ensuring the stability of the operation of the transmission line;

[0020] (2) The insulator structure with comprehensive protection function of the present invention optimizes the size of the lightning protection component so that the lightning protection component has better ice flash protection and pollution flash protection effects, further improves the performance of the lightning protection component, improves the comprehensive protection performance and use stability of the insulator structure, and prolongs the service life of the insulator structure;

[0021] (3) The insulator structure with comprehensive protection function of the present invention has a simple structure and is easy to set up and maintain. By using the corresponding settings of the current limiting component and the lightning protection component, the insulator structure can show good insulation and protection effects when it is affected by the overvoltage of the distribution line or the lightning overvoltage. The insulator structure has strong environmental adaptability and can adapt to transmission lines in various environments. It has good application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of an insulator structure with comprehensive protection function in an embodiment of the present invention;

[0023] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Metal upper attachment, 2. Lightning protection component, 201. Upper external electrode, 202. Lower external electrode; 3. Insulator body, 4. Metal lower attachment, 5. Upper hardware, 6. Current limiting component, 7. Lower hardware. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Example:

[0030] The insulator structure with comprehensive protection function in the preferred embodiment of the present invention is as follows Figure 1 As shown in , the insulator structure includes an insulator body 3, and a metal upper attachment 1, a lightning protection component 2, a metal lower attachment 4, an upper hardware 5, a current limiting component 6 and a lower hardware 7 are respectively arranged at both ends of the insulator body 3 in the axial direction.

[0031] Specifically, if Figure 1 As shown in , the axis of the insulator body 3 is arranged vertically, and it is preferably formed by injection of silicone rubber on the core rod, which mainly plays the role of potential isolation. On the top of the insulator body 3, a metal upper attachment 1 and a lightning protection component 2 are arranged in sequence from top to bottom, and a metal lower attachment 4 is arranged at the bottom of the insulator body 3. The insulator body 3 is connected to the metal upper and lower attachments (1, 4) through the upper and lower ends of the insulating support rod inside it, respectively, to provide sufficient bending strength for the insulator structure. At the same time, the metal upper and lower attachments in the preferred embodiment are respectively made of die-cast steel, and their surfaces are hot-dip galvanized.

[0032] Among them, the metal upper attachment 1 is used to fix the line conductor and connect the high-voltage end of the distribution line; the lightning protection component 2 is a disc structure, which is preferably made of insulating silicone rubber material, and a plurality of lightning protection electrodes are arranged at intervals along the annular direction inside the outer circumference. Each lightning protection electrode is arranged in series, and there is an air chamber between each adjacent lightning protection electrode. The aperture of the air chamber is 3~15mm in the preferred embodiment, and then a multi-gap structure composed of a plurality of air chambers is formed on the outer circumference of the disc structure, which plays the role of conducting current and extinguishing arc.

[0033] Furthermore, electrode structures are provided at the top and bottom of the lightning protection component 2, such as Figure 1 The upper outer electrode 201 and the lower outer electrode 202 shown in the figure mainly play the role of conducting current and assisting arc extinguishing. The above-mentioned outer electrode includes a conductor and a fixing column. The conductor is installed on the disc structure of the lightning protection component 2 through the fixing column. The shape of the conductor is preferably spherical, hemispherical, cylindrical, etc. In the preferred embodiment, it is preferably spherical, and the conductor is preferably made of copper or stainless steel. At the same time, the upper outer electrode 201 and the lower outer electrode 202 are respectively connected to the first and last lightning protection electrodes in the disc structure, and there is an area where the lightning protection electrode is not set on the disc ring between the two outer electrodes (usually on the ring with a smaller distance between the two electrodes), that is, there is a certain setting angle between the setting positions of the upper and lower outer electrodes.

[0034] Furthermore, the lightning protection component in the preferred embodiment is a large outer diameter disc structure, and the outer diameter of the disc structure is 200~400mm. By preferably setting the outer diameter of the disc structure, the lightning protection component 2 has a better anti-ice flash effect. Moreover, since the discharge channel of the insulator structure is fixed, the flashover effect caused by pollution is small, which can play a good role in preventing pollution flash. Further preferably, the upper surface of the lightning protection component 2 is in a downward tilt from the center to the outside, so that the top surface of the disc structure is not easy to accumulate rainwater.

[0035] Furthermore, at the bottom of the insulator body 3, a metal lower attachment 4, an upper hardware 5, a current limiting component 6 and a lower hardware 7 are sequentially arranged along its axis from top to bottom. Among them, the metal lower attachment 4 is arranged at the bottom of the insulator body 3, and a structure similar to the upper external electrode 201 or the lower external electrode 202 is correspondingly arranged on its periphery, that is, it includes a conductor and a fixing column, which is matched with the lower external electrode 202, and a main gap is formed between the conductors of the two, which plays the role of conducting current and assisting arc extinguishing. Correspondingly, an external electrode structure is also arranged on the periphery of the metal upper attachment 1, which is used to match the upper external electrode 201, and another main gap is formed between the two, so as to play the role of conducting current and assisting arc extinguishing.

[0036] Furthermore, the current limiting component 6 is connected to the metal lower attachment 4 through the upper hardware 5. The current limiting component 6 is a nonlinear resistor, which can present a low resistance characteristic under the action of overvoltage and a high resistance characteristic under the power frequency current. In a preferred embodiment, the current limiting component is made of conductive silicone, and its resistance value is 3~20Ω.

[0037] By setting the current limiting component 6, the insulator structure can present a low resistance characteristic when encountering a lightning overvoltage, so that the lightning current can smoothly pass through the current limiting component 6 and be introduced into the ground to achieve the discharge of the overcurrent; and when the power frequency current passes through, the insulator structure presents a high resistance characteristic, and the amplitude and steepness of the power frequency current are limited, thereby helping the lightning protection component 2 to more easily block the passage of the power frequency current and achieve the extinguishing of the power frequency continuous current, thereby improving the insulation capacity of the insulator structure. In addition, a lower hardware 7 is provided at the bottom of the current limiting component 6, which can be connected to the cross arm of the pole tower to support the entire insulator structure and ensure that the insulator structure can perform its function normally.

[0038] In the preferred embodiment of the present invention, a multi-gap lightning protection component and a current limiting component are combined and arranged on the insulator body, so that the insulator structure has a comprehensive protection function. When it is running on the distribution line, the overvoltage or lightning overvoltage of the distribution line will act on each external main gap and the internal multi-gap of the lightning protection component and the current limiting component. When the overvoltage or lightning overvoltage exceeds a certain value, under the action of the lightning protection component, the lightning current and the power frequency follow-up current will be limited, and the current limiting component limits the power frequency current amplitude, so that the arc is extinguished when the subsequent power frequency current passes through zero and no longer reignites, thereby effectively realizing overvoltage or lightning protection.

[0039] The insulator structure with comprehensive protection function in the present invention has a simple structure and is easy to set up and maintain. By using the corresponding settings of the current limiting component and the lightning protection component, the insulator structure can show good insulation and protection effects when it is affected by the overvoltage of the distribution line or the lightning overvoltage. The insulator structure has strong environmental adaptability and can adapt to transmission lines in various environments. It has good application prospects and promotion value.

[0040] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An insulator structure with comprehensive protection function, characterized in that: It includes a metal upper accessory, a lightning protection component, an insulator body, a metal lower accessory, an upper hardware, a current limiting component and a lower hardware which are sequentially arranged along the axial direction; The metal upper attachment is connected to the high voltage end of the power distribution line and is used to fix the line conductor; The lightning protection component is in a disc structure and is made of insulating silicone rubber material; the upper surface of the lightning protection component is in a downwardly inclined form from the center to the outside, and the outer diameter of the disc structure is 200-400 mm; a plurality of lightning protection electrodes are arranged at intervals along the circumferential direction inside the outer periphery of the lightning protection component, and an air chamber connected to the outer periphery of the disc structure is opened between two adjacent lightning protection components to form a circumferentially continuous inner electrode structure; The two ends of the insulator body are respectively connected to the lightning protection component and the metal lower attachment, and the metal lower attachment and the current limiting component are connected through the upper hardware; External electrodes are respectively arranged on the outer circumference of the metal upper attachment, on the end surfaces of both sides of the lightning protection component and on the outer circumference of the metal lower attachment, the external electrodes include conductors and fixing posts, the conductors are fixed at corresponding positions by fixing posts, and there is a certain distance between the two conductors on the same side, and the two external electrodes connected to the lightning protection component are respectively connected to the head and tail ends of the internal electrode structure; The current limiting component is a nonlinear resistor, one end of which is away from the upper hardware and connected to the lower hardware, so as to be connected to the cross arm of the line tower through the lower hardware; and the current limiting component is made of conductive silicone, and its resistance value is 3~20Ω.

2. The insulator structure with comprehensive protection function according to claim 1, wherein: The aperture of the air chamber is 3-15 mm.

3. The insulator structure with comprehensive protection function according to claim 1 or 2, wherein: The conductor is in a spherical, hemispherical or cylindrical shape.

4. The insulator structure with comprehensive protection function according to claim 1 or 2, wherein: The conductor is made of copper or stainless steel.

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