CN212062042U

CN212062042U - Insulator structure with comprehensive protection function

Info

Publication number: CN212062042U
Application number: CN202021120195.0U
Authority: CN
Inventors: 吴求兵
Original assignee: WUHAN ARROW ADVANCED TECHNOLOGY CO LTD
Current assignee: WUHAN ARROW ADVANCED TECHNOLOGY CO LTD
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-12-01
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses an insulator structure with comprehensive protection function belongs to overhead line arrester technical field, it sets up many clearances lightning protection part and current-limiting part respectively through the both ends at the insulator body, utilize current-limiting part's non-linear resistance characteristic, can present the low resistance characteristic when the insulator structure receives the overvoltage effect, and present the high resistance characteristic under follow-up power frequency current, help lightning protection part can realize overcurrent's earial drainage and blocking of power frequency current well, guarantee the barrier propterty of insulator structure. The utility model discloses an insulator structure, its simple structure sets up and maintains the convenience, utilizes the corresponding setting of current limiting part and lightning protection part for insulator structure can present better insulating effect and protecting effect when the overvoltage or the thunderbolt overvoltage action of receiving the distribution lines, makes the environmental suitability of insulator structure strong, can adapt to the transmission line of various environment, has better application prospect and spreading value.

Description

Insulator structure with comprehensive protection function

Technical Field

The utility model belongs to the technical field of overhead line arrester, concretely relates to insulator structure with synthesize safeguard function.

Background

With the development of social economy, the coverage of overhead transmission lines is wider and wider, and the overhead transmission lines play an increasingly important role in industrial production and daily life. In overhead transmission lines, insulators are often indispensable, which mainly serve to support the conductors and prevent current from flowing back to ground, in the former case, they are related to the stability of the conductor arrangement, which should not fail due to changes in environmental and electrical load conditions; in the latter case, the normal operation of the line is often affected, and the prevention of current flowing back to the ground means that the insulator can withstand the voltage of the line, and the insulator does not generate a flashover phenomenon due to overvoltage. Both of these effects must generally be guaranteed otherwise there is a greater risk of the overhead transmission line working.

In the actual operation process of the overhead transmission line, various special environmental phenomena are generally encountered, wherein the lightning phenomenon is the most influential phenomenon. When the lightning action is encountered, the insulator of the overhead transmission line can generate surface flashover under the action of lightning overvoltage or lightning induced overvoltage, so that the current of the line flows back to the ground to trip the line, and the normal operation of the line is influenced. In recent years, accidents such as lightning trip, insulator flashover and the like frequently occur in alternating current overhead lines at home and abroad, so that huge economic loss is caused, and the safe operation of the overhead lines is seriously threatened.

At present, insulators widely applied are often single in function, difficult to guarantee working stability under the condition that environment and electric load conditions change, and poor in adaptability to extreme condition environments such as lightning stroke, dirt, freezing and high altitude. In addition, the existing line arrester for the power transmission line is complex in installation, difficult to maintain and extremely high in application cost, the setting cost of the overhead power transmission line is greatly increased, and the normal and reliable operation of the overhead power transmission line is influenced.

SUMMERY OF THE UTILITY MODEL

To the above defect of prior art or improve in the demand one or more, the utility model provides an insulator structure with synthesize safeguard function can effectively promote the ability of insulator structure withstand voltage, guarantees the steady operation of insulator structure under the thunder and lightning effect condition, and then ensures overhead transmission line's operating stability.

In order to achieve the purpose, the utility model provides an insulator structure with comprehensive protection function, which is characterized in that the insulator structure comprises a metal upper accessory, a lightning protection component, an insulator body, a metal lower accessory, an upper hardware fitting, a current limiting component and a lower hardware fitting which are arranged along the axial direction in sequence;

the metal upper accessory is connected with a high-voltage end of the distribution line and used for fixing a line lead;

the lightning protection components are of a disc structure, a plurality of lightning protection electrodes are arranged inside the periphery of the lightning protection components at intervals along the circumferential direction, and air chambers communicated with the periphery of the disc structure are respectively arranged between every two adjacent lightning protection components to form an inner electrode structure which is continuous in the circumferential direction;

the two ends of the insulator body are respectively connected with a lightning protection component and a lower metal accessory, and the lower metal accessory is connected with the current limiting component through an upper hardware fitting;

outer electrodes are respectively arranged on the periphery of the upper metal accessory, the end faces of the two sides of the lightning protection component and the periphery of the lower metal accessory, each outer electrode comprises a conductor and a fixing column, the conductors are fixed at corresponding positions through the fixing columns, a certain distance is arranged between the two conductors positioned on the same side at intervals, and the two outer electrodes connected to the lightning protection component are respectively connected with the head end and the tail end of the inner electrode structure;

the current-limiting component is a nonlinear resistor, and one end of the current-limiting component, which deviates from the upper hardware fitting, is connected with the lower hardware fitting so as to be connected to the cross arm of the line tower through the lower hardware fitting.

As a further improvement of the utility model, the outer diameter of the disc structure is 200-400 mm.

As a further improvement, the current limiting component is made of conductive silica gel, and the resistance value is 3 ~ 20 omega.

As a further improvement, the aperture of the air chamber is 3-15 mm.

As a further improvement of the present invention, the conductor is spherical, hemispherical or cylindrical.

As a further improvement of the utility model, the conductor is formed by processing copper or stainless steel.

The above-described improved technical features may be combined with each other as long as they do not conflict with each other.

Generally, through the utility model discloses above technical scheme who conceives compares with prior art, has following beneficial effect:

(1) the utility model discloses an insulator structure with comprehensive protection function, it is through setting up many clearances lightning protection part and current-limiting part respectively at the both ends of insulator body, utilize the nonlinear resistance characteristic of current-limiting part, can present the low resistance characteristic when the insulator structure receives overvoltage action, realize the smooth earial drainage of overcurrent, and present the high resistance characteristic under the follow-up power frequency current, limit the amplitude and the steepness of power frequency current, help lightning protection part can be better block the passing through of power frequency current, realize extinguishing of power frequency afterflow, promote the insulating ability of insulator structure, play better protective effect, guarantee the stability of transmission line operation;

(2) the insulator structure with the comprehensive protection function of the utility model has the advantages that the size of the lightning protection part is set preferably, so that the lightning protection part has better anti-icing flashover effect and anti-pollution flashover effect, the performance of the lightning protection part is further improved, the comprehensive protection performance and the use stability of the insulator structure are improved, and the service life of the insulator structure is prolonged;

(3) the utility model discloses an insulator structure with synthesize safeguard function, its simple structure sets up and maintains the convenience, utilizes the corresponding setting of current-limiting part and lightning protection part for the insulator structure can present better insulating effect and protecting effect when the overvoltage or the thunderbolt overvoltage action of receiving the distribution lines, makes the environmental suitability of insulator structure strong, can adapt to the transmission line of various environment, has better application prospect and spreading value.

Drawings

Fig. 1 is a schematic view of an overall structure of an insulator structure with an integrated protection function according to an embodiment of the present invention;

in all the figures, the same reference numerals denote the same features, in particular: 1. metal upper accessories, 2, lightning protection components, 201, an upper external electrode, 202, a lower external electrode; 3. the insulator comprises an insulator body, 4 parts of metal lower accessories, 5 parts of upper hardware fittings, 6 parts of current limiting components and 7 parts of lower hardware fittings. .

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Example (b):

the insulator structure with comprehensive protection function in the preferred embodiment of the present invention is shown in fig. 1. The insulator structure comprises an insulator body 3, and an upper metal accessory 1, a lightning protection component 2, a lower metal accessory 4, an upper hardware fitting 5, a current limiting component 6 and a lower hardware fitting 7 are respectively arranged at two axial ends of the insulator body 3.

Specifically, as shown in fig. 1, the axis of the insulator body 3 is arranged vertically at this time, and it is preferably formed by injecting silicon rubber on a mandrel, and mainly functions as potential isolation. The top of the insulator body 3 is sequentially provided with the metal upper accessory 1 and the lightning protection component 2 from top to bottom, the bottom of the insulator body 3 is provided with the metal lower accessory 4, and the insulator body 3 is respectively connected with the metal upper accessory (1) and the metal lower accessory (4) through the upper end and the lower end of an insulating support rod inside the insulator body, so that enough bending strength is provided for the insulator structure. Meanwhile, the metal upper and lower accessories in the preferred embodiment are made of die-cast steel respectively, and the surfaces of the metal upper and lower accessories are subjected to hot galvanizing treatment.

The metal upper accessory 1 is used for fixing a line lead and connecting a high-voltage end of a distribution line; the lightning protection component 2 is of a disc structure, and is preferably made of an insulating silicon rubber material, a plurality of lightning protection electrodes are arranged in the circumferential inner part of the disc structure at intervals along the circumferential direction, each lightning protection electrode is arranged in a series connection mode, air chambers are respectively arranged between two adjacent lightning protection electrodes, the aperture of each air chamber is 3-15 mm in the preferred embodiment, then a multi-gap structure composed of a plurality of air chambers is formed in the circumferential direction of the disc structure, and the effects of conducting current and extinguishing arc are achieved.

Further, electrode structures, i.e., an upper external electrode 201 and a lower external electrode 202 as shown in fig. 1, are respectively disposed at the top and the bottom of the lightning protection member 2, and mainly function to conduct current and assist arc quenching. The external electrode includes a conductor and fixing posts, the conductor is mounted on the disc structure of the lightning protection component 2 through the fixing posts, the shape of the conductor is preferably spherical, hemispherical, cylindrical and the like, the conductor is preferably spherical in a preferred embodiment, and the conductor is preferably processed by copper or stainless steel. Meanwhile, the upper outer electrode 201 and the lower outer electrode 202 are respectively connected with the head and the tail lightning protection electrodes in the disc structure, and an area without the lightning protection electrodes exists on the circumferential direction of the disc between the two outer electrodes (usually, the distance between the two electrodes is smaller, and the circumferential direction is upward), that is, a certain setting angle exists between the setting positions of the upper outer electrode and the lower outer electrode.

Further, the lightning protection component in the preferred embodiment is a disc structure with a large outer diameter, and the outer diameter of the disc structure is 200-400 mm. Through the preferred external diameter that sets up the disc structure for lightning protection part 2 has better anti-icing effect of dodging. Moreover, because the discharge channel of the insulator structure is fixed, the flashover influence caused by dirt is small, and a good anti-pollution flashover effect can be achieved. Further preferably, the upper surface of the lightning protection member 2 is inclined downwards from the center to the outside, so that rainwater is not easy to accumulate on the top surface of the disc structure.

Further, a metal lower accessory 4, an upper hardware fitting 5, a current limiting component 6 and a lower hardware fitting 7 are sequentially arranged at the bottom of the insulator body 3 from top to bottom along the axis of the insulator body. The metal lower accessory 4 is arranged at the bottom of the insulator body 3, and the periphery of the metal lower accessory is correspondingly provided with a structure similar to the upper outer electrode 201 or the lower outer electrode 202, namely, the metal lower accessory comprises a conductor and a fixed column, the conductor and the fixed column are correspondingly matched with the lower outer electrode 202, and a main gap is formed between the conductors of the conductor and the fixed column, so that the functions of conducting current and auxiliary arc quenching are achieved. Correspondingly, an outer electrode structure is also arranged on the outer periphery of the metal upper accessory 1 and is used for matching with the upper outer electrode 201, and another main gap is formed between the upper outer electrode and the upper outer electrode to play the roles of conducting current and assisting arc quenching.

Further, a current limiting component 6 is connected with the metal lower accessory 4 through an upper hardware fitting 5, and the current limiting component 6 is a nonlinear resistor and can present low-resistance characteristics under the action of overvoltage and high-resistance characteristics under the action of power frequency current. In a preferred embodiment, the current limiting component is made of conductive silica gel, and the resistance value of the current limiting component is 3-20 omega.

By utilizing the arrangement of the current limiting component 6, the insulator structure can present low resistance characteristic when suffering from lightning overvoltage, so that lightning current can smoothly pass through the current limiting component 6 and be led into the ground, and overcurrent discharge is realized; when the power frequency current passes through, the insulator structure presents a high-resistance characteristic, the amplitude and the gradient of the power frequency current are limited, and therefore the lightning protection component 2 can block the passing of the power frequency current more easily, the extinguishing of power frequency follow current is achieved, and the insulating capacity of the insulator structure is improved. In addition, be provided with down gold utensil 7 in the bottom of current-limiting component 6, it can correspond to be connected on the cross arm of shaft tower for support whole insulator structure, guarantee that insulator structure can normally accomplish its function.

The utility model discloses in the preferred embodiment through make up on the insulator body and set up many clearances lightning protection part and current limiting component for the insulator structure has comprehensive safeguard function. When operating on the distribution line, the distribution line over-voltage or lightning over-voltage may act on the outer main gaps and the inner multi-gap and current limiting components of the lightning protection component. When overvoltage or lightning overvoltage exceeds a certain value, under the action of the lightning protection component, lightning current and power frequency follow current can be limited, and the current limiting component limits the amplitude of the power frequency current, so that electric arc is extinguished and reignition is avoided when the subsequent power frequency current crosses zero, and overvoltage or lightning protection is effectively realized.

The utility model provides an insulator structure with synthesize safeguard function, its simple structure sets up and maintains the convenience, utilizes the corresponding setting of current-limiting part and lightning protection part for the insulator structure can present better insulating effect and protecting effect when the overvoltage or the thunderbolt overvoltage action of receiving the distribution lines, makes the environmental suitability of insulator structure strong, can adapt to the transmission line of various environment, has better application prospect and spreading value.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. An insulator structure with a comprehensive protection function is characterized by comprising a metal upper accessory, a lightning protection component, an insulator body, a metal lower accessory, an upper hardware fitting, a current limiting component and a lower hardware fitting which are sequentially arranged along an axial direction;

2. The insulator structure with the comprehensive protection function according to claim 1, wherein the outer diameter of the disc structure is 200-400 mm.

3. The insulator structure with the comprehensive protection function according to claim 1, wherein the current limiting component is made of conductive silica gel, and the resistance value of the current limiting component is 3-20 Ω.

4. The insulator structure with the comprehensive protection function according to any one of claims 1 to 3, wherein the pore diameter of the air chamber is 3 to 15 mm.

5. The insulator structure with the comprehensive protection function according to any one of claims 1 to 3, wherein the conductor is spherical, hemispherical or cylindrical.

6. The insulator structure with the comprehensive protection function according to any one of claims 1 to 3, wherein the conductor is machined from copper or stainless steel.