High-reliability insulating tile plate lightning arrester

Abstract

The invention discloses a high-reliability insulating tile plate lightning arrester, which comprises a core group, a shell, an end part module and an elastic module, the core group is at least formed by stacking a plurality of cylindrical resistor discs; the shell provides a cavity and mechanical support for the core assembly; the end modules are arranged at the two ends of the shell and are connected with the shell to form a closed cavity required by the core group; the elastic module consists of a guide shaft, an elastic element and a conductive copper strip, and is used for providing axial pressing force for the core group and ensuring good contact of the end surfaces of the resistor discs; the device further comprises at least one insulating tile plate and a positioning plate. The insulating tile plate is made of an insulating material, is arranged in the circumferential direction of the core group and is positioned between the outer wall of the core group and the inner wall of the cylinder of the shell; the radial movement of the resistor disc is limited; the positioning plate is arranged at the two ends of the core group or between the resistor discs, and a groove is formed in the circumference of the positioning plate and used for positioning the insulating tile slate. The lightning arrester has the advantages of being simple in structure, easy to assemble, low in cost and capable of effectively improving the short-circuit performance of the lightning arrester.

Description

Technical Field

[0001] The invention relates to the technical field of lightning arresters, in particular to a high-reliability insulating tile plate lightning arrester suitable for overvoltage protection of high-voltage electrical appliances. Background Art

[0002] Lightning arresters are important devices for overvoltage protection of power systems. The fixing method of the core group of the core component inside the arrester is one of the important factors affecting the safe and stable operation of the arrester. The core group is composed of one or more resistors and conductive pads stacked in series. The fixing method of the core group has a great influence on the stability of the arrester during transportation and operation, as well as the short-circuit performance when subjected to short-circuit current. Existing arresters mainly use the following fixing methods: 1. The arrester core group is fixed by heat shrinking the heat shrink tube or fully enclosed winding of the glass fiber tape. The mechanical strength of the core body is low, and sand or potting glue needs to be filled between the core body and the shell to compensate for the lack of mechanical strength of the core body. The assembly process of this structure arrester is complicated, and the filler can easily bring moisture into the interior of the arrester, causing product performance to decline. In addition, the core group is completely enclosed in the heat shrink tube and glass fiber, and there is no reserved pressure release channel in the internal cavity. In the event of a short circuit, internal pressure is easily accumulated, causing the arrester to explode.

[0003] 2. The cavity arrester uses an insulating rod to fix the core group. The core group is fixed by the cage structure formed by the insulating rod. The core group is in direct contact with the internal air cavity. The short-circuit arc can quickly and smoothly open the pressure release device to release the internal pressure and avoid a crushing explosion. Although the arrester of this structure solves the short-circuit performance problem, it still has shortcomings such as complex manufacturing process, high cost and large size.

[0004] Chinese patent document CN 111863361 A discloses an arrester and a method for manufacturing the same. A composite jacket arrester without an air cavity is designed, and spaced arc plates are used as the mechanical shell of the arrester to improve the short-circuit performance of the arrester. However, this design still has shortcomings. The arc plates are weakly fixed on the end electrodes, and the arrester is difficult to withstand large tensile and bending loads, and cannot meet the requirements of application in medium and high voltage products. Summary of the invention

[0005] The invention provides a high-reliability insulating tile plate lightning arrester, which has a simple structure, is easy to assemble, has a low cost, has reliable product performance, and can effectively improve the short-circuit performance of the lightning arrester.

[0006] The technical solution of the present invention is: to provide a high-reliability insulating tile plate arrester, comprising a core group, a shell, an end module and an elastic module; The core group is formed by stacking at least a plurality of cylindrical resistor sheets; The shell provides a cavity and mechanical support for the core group; The end modules are arranged at both ends of the shell to form a closed cavity required by the core group; The elastic module, which is composed of a guide shaft, an elastic element and a conductive copper strip, provides an axial pressing force for the core group to ensure good contact of the end surface of the resistor; Also includes at least one insulating tile board and a positioning plate; The insulating tile is made of insulating material and is arranged in the circumferential direction of the core group, between the outer wall of the core group and the inner wall of the cylinder of the outer shell; it is used to limit the radial movement of the resistor; The positioning plate is arranged at both ends of the core group or between the resistor sheets and is used to position the insulating tile.

[0007] As an improvement to the present invention, at least two first protrusions extending outward are provided in the circumferential direction of the positioning plate, and first grooves are formed between adjacent first protrusions. The insulating tile plate is passed through the first grooves of the positioning plates at both ends, and the first grooves and the inner wall of the cylinder limit the radial movement of the positioning plate, so that the positioning plate is always set in the circumferential direction of the core group.

[0008] As an improvement to the present invention, the first protrusion includes a long protrusion and a short protrusion, wherein the long protrusion cooperates with the second grooves on both ends of the cylinder to position the positioning plate.

[0009] As an improvement to the present invention, the insulating tile is an arched plate made of insulating material, and a buffer layer is wrapped on the outer wall of the arched plate.

[0010] As an improvement to the present invention, the buffer layer is a soft insulating material and is formed on the arched plate by vulcanization molding or heat shrinkage molding using a heat shrink tube.

[0011] As an improvement to the present invention, the arched plate is completely wrapped by the buffer layer, or the arched plate is wrapped by the buffer layer at a position relative to the core group.

[0012] As an improvement to the present invention, the insulating tile plate includes an inner arc and an outer arc, the radius of the inner arc is equal to or greater than the radius of the resistor sheet; the radius of the outer arc is equal to or less than the radius of the inner wall of the shell.

[0013] As an improvement to the present invention, the shell is a composite insulator or a ceramic hollow insulator, and flanges are provided at both ends of the insulator.

[0014] As an improvement to the present invention, at least one second protrusion and a third groove are provided on the inner circle of the sealing surface of the flange, and the diameter of the third groove is equal to the inner diameter of the cylinder.

[0015] As an improvement to the present invention, a notch serving as a pressure release arc outlet is provided on at least one side surface of the flange, and fourth grooves for fixing a sealing plate are provided on both sides of the notch.

[0016] As an improvement to the present invention, the flanges at both ends are arranged symmetrically, and the third groove and the notch are in the same direction.

[0017] As an improvement to the present invention, buckles are provided on both sides of the sealing plate, and the buckles are used to fix the sealing plate in the fourth groove of the flange.

[0018] As an improvement to the present invention, one or more positioning plates are provided in the middle of the core group for reinforcing the positioning of the insulating tile.

[0019] As an improvement to the present invention, the outer diameters of all the first grooves are equal; or the outer diameters of the first grooves are grooves of two different diameters, wherein the diameter of the large groove is equal to the diameter of the resistor sheet, and the outer diameter of the small groove is slightly larger than the diameter of the resistor sheet, so as to limit the radial movement of the insulating tile.

[0020] As an improvement to the present invention, both ends of the insulating tile are located between the third groove and the small groove of the positioning plate, and the movement of the insulating tile is limited by the second protrusion of the flange and the small groove of the positioning plate.

[0021] As an improvement to the present invention, the shell is composed of a cylinder and a silicone rubber umbrella skirt arranged on the outer wall of the cylinder.

[0022] As an improvement to the present invention, the cylinder is made of insulating material.

[0023] As an improvement to the present invention, at least one fifth groove for releasing pressure during short circuit may be provided on the circumference of the cylinder.

[0024] As an improvement to the present invention, the shape of the fifth groove is a regular geometric shape, including but not limited to a circle, an ellipse or a rectangle.

[0025] As an improvement to the present invention, the fifth groove is a through groove or a blind hole groove.

[0026] As an improvement to the present invention, at both ends of the cylinder there is one or more second grooves for positioning the positioning plate.

[0027] As an improvement to the present invention, conductive pads are provided between the resistor sheets.

[0028] The advantages of the present invention are: using insulating tiles as the mechanical support of the core group, replacing the glass fiber tape, heat shrink tube, filler, etc. in the existing structure, forming a smooth airway between the insulating tiles, and the internal resistor directly contacts the airway, which is conducive to the movement of the internal airflow during the pressure release process of the arrester. The internal pressure will be quickly transmitted and open the pressure release hole or pressure release device to lead the arc to the outside, avoiding the pulverizing explosion of the arrester, and effectively improving the reliability of the arrester short circuit. The core group fixing method is simple, easy to assemble, the arrester is running, the short-circuit performance is good, and the operation reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a vertical cross-sectional schematic diagram of a lightning arrester according to an embodiment of the invention.

[0030] Figure 2 Schematic diagram of a three-dimensional explosion of the arrester in the embodiment.

[0031] Figure 3 yes Figure 1 Schematic diagram of the cross section of AA without shed skirt and flange.

[0032] Figure 4 It is a vertical cross-sectional schematic diagram of another embodiment of a lightning arrester described in the present invention.

[0033] Figure 5 It is a three-dimensional schematic diagram without the shed skirt, in which the upper part of the flange can be seen. DETAILED DESCRIPTION

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] The invention provides a high-reliability insulating tile plate lightning arrester, which has the advantages of simple structure, small size, good short-circuit performance, etc., and has high reliability during transportation and operation.

[0036] Specific implementation case 1 like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a high-reliability insulating tile arrester, which is an insulating tile arrester with a pressure release device, including a core group 1, a shell 2, an end module 3, an elastic module 4, an insulating tile 5, a positioning plate 6, and a drying module 8. In this embodiment, the shell 2 is an insulating shell.

[0037] The shell 2 is a hollow insulator, preferably a hollow insulator with a porcelain or composite jacket. In the present embodiment, it is a hollow insulator with a composite jacket, which is composed of a cylinder 21, an umbrella skirt 22, an upper flange 23 and a lower flange 24. The umbrella skirt 22 is made of silicone rubber and is bonded to the cylinder 21 by an adhesive; the upper flange 23 and the lower flange 24 are symmetrically fixed at both ends of the cylinder 21 by an adhesive. In the present embodiment, the cylinder 21 is made of an insulating material.

[0038] One or more second protrusions 231 may be provided on the inner circle of the upper flange 23 and the lower flange 24, a third groove 232 is formed between two adjacent second protrusions 231, and one or more notches 233 are provided on the side as pressure release ports. Fourth grooves 234 may be provided on both sides of the notch 233 to fix the notch sealing plate 7; the outer end surfaces of the upper flange 23 and the lower flange 24 are connected to the high-voltage terminal board, the low-voltage terminal board or another lightning arrester component.

[0039] The end module 3 is a module containing a pressure relief device, such as Figure 2 As shown, it includes a pressure plate 31, a pressure release plate 32, an upper cover plate 34 (or a lower cover plate 35) and a sealing ring 33 in sequence, and the end module 3 is fixed to the sealing surfaces 235 of the upper and lower flanges respectively through a group of bolts (not shown) to form a sealed cavity with a pressure release device, wherein the upper cover plate 34 and the lower cover plate 35 are respectively connected to the upper flange 23 and the lower flange 24 of the shell.

[0040] The core group 1 is formed by stacking a number of resistor sheets 11, and a conductive pad 12 can be stacked in the middle to adjust the height of the entire core group. The resistor sheet 11 is a nonlinear element, and its shape is preferably circular. The core group 1 is installed in a sealed cavity formed by the housing 2 and the end module 3. The diameter and number of the resistor sheets 11 can be increased or decreased according to the requirements of actual application conditions.

[0041] The drying module 8 is located at the lower end of the core group 1, and includes an upper positioning block 81, a conductive tube 82, and a lower positioning block 83 from top to bottom, wherein the conductive tube 82 is a conductive hollow tube for placing a desiccant, and the end surfaces where the upper positioning block 81 and the lower positioning block 83 are connected to the conductive tube 82 are provided with a lower boss for positioning the conductive tube 82. A through hole is opened in the center of the lower positioning block 83, and the lower positioning block 83 is fixed to the threaded hole in the center of the lower cover plate 35 by bolts.

[0042] The elastic module 4 is located at the upper end of the core group 1, and is used to provide axial compression force for the core group 1 to ensure good contact of the end face of the resistor 11 in the core group 1. The elastic module 4 includes an elastic member 42 and an elastic member positioning member block 41. The elastic member 42 can be a coil spring, a disc spring or other elastic parts. In this embodiment, a coil spring is selected as the elastic member, and a flexible conductive belt 43 is also wound on it. The upper end face of the positioning shaft 41 is provided with an upper boss for positioning the elastic member 42 and providing guidance when it is extended and retracted. The lower end face of the upper cover plate 34 is provided with a groove for positioning the upper end of the elastic member 42.

[0043] The insulating tile 5 is arranged between the core group (1) and the inner wall of the shell 2, and the number of the insulating tile 5 can be one or more. The insulating tile 5 is an arched plate made of insulating material, which can be POM, PA66, PBT and fiber reinforced plastic (FRP) and other insulating materials. The insulating tile 5 has an inner arc 5a and an outer arc 5b; the arc 5a can be an arc with a radius equal to or slightly larger than the outer radius of the resistor 11; the outer arc 5b can be an arc with a radius equal to or smaller than the inner wall diameter of the shell, and the center angle of the arc can be selected between 20° and 350°; the lightning arrester in this embodiment adopts three insulating tiles, and the insulating tile 5 is composed of an arched plate 51 and a buffer layer 52. The buffer layer 52 is fixed to the arched plate 51 by heat shrinking a heat shrink tube. The buffer layer outside the insulating tile (5) can effectively absorb the impact force of the resistor 11 shaking during the transportation of the lightning arrester to avoid damage to the resistor 11; the diameter of the outer arc 5a of the insulating tile 5 is equal to the inner diameter of the inner cavity of the shell 2, the diameter of the inner arc 5b is the radius of the resistor 11 + 1.5mm, and the center angle is 45°.

[0044]

[0045] It is arranged around the core group 1, with the outer arc 5b fitting in the inner cavity of the shell 2, and both ends of the insulating tile 5 are located in the third grooves 232 on the flange. The second protrusions 231 on both sides of the third groove 232 limit the movement of the flange in the circumferential direction.

[0046] One or more positioning plates 6 can be set inside the core group 1 to cooperate with the outer shell 2 to limit the radial movement of the insulating tile 5. The positioning plate 6 can be a conductive material, and a plurality of first protrusions 61 are evenly distributed on its outer circumference. A small groove 62a and a large groove 62b are provided between two adjacent first protrusions 61. The arc of the small groove 62a can be controlled between the resistor 11 and the insulating tile 5; the insulating tile 5 is located between the third groove 232 of the flange and the small groove 62a, which can effectively position the insulating tile 5, thereby limiting the radial movement of the resistor 11 and the conductive pad 12 in the core group 1, and ensuring the stability of the product during transportation and operation.

[0047] The gaps formed along the axial direction between the insulating tiles 5 can keep the internal airflow unobstructed, and serve as a pressure release channel when the arrester is short-circuited. In order to ensure that the internal airway is as unobstructed as possible, the diameter of the large groove 62b on the positioning plate 6 can be equal to or less than the diameter of the resistor 11, so that the internal airway is as large as possible to ensure the circulation of the internal arc when short-circuited.

[0048] The outer diameters of the conductive tube 82 and the bottom pad 83 in the elastic module 4 and the drying module 8 can be smaller than the outer diameter of the resistor 11, and sufficient space is reserved at both ends of the inner cavity of the housing 2 to facilitate pressure release during short circuit.

[0049] Specific implementation case 2 like Figure 4 As shown, this embodiment provides a high-reliability insulating tile arrester, which is an insulating tile arrester with explosion-proof grooves, including a core group 1, a shell 2, an end module 3, an elastic module 4, an insulating tile 5, and a positioning plate 6; The outer shell 2 is a composite outer shell with explosion-proof grooves, which is composed of a cylinder 21 and a silicone rubber shed 22. Figure 5 As shown, one or more fifth grooves 211 are provided on the cylinder 21 as weak points on the shell, which are used to release the internal arc in the event of a short circuit. The fifth groove 211 can be in any shape such as a strip or a circle, and can be a through groove or a blind hole groove. The silicone rubber umbrella skirt is firmly connected to the cylinder 21 through an adhesive; both ends of the cylinder 21 can also be provided with internal or external threads 212 for connection with the end flange. One or more second grooves 213 are opened on the end surfaces of both ends of the cylinder 21, and the second grooves 213 at both ends are completely aligned, which are used to position the positioning plate 6.

[0050] The end module 3 includes an upper flange 31 and a lower flange 32, both of which are provided with threads that match the cylinder 21. When connected, a fastening glue is applied to the threads to ensure the connection strength and sealing. The flange can be a metal flange with one or more connecting holes on the outside, and its outer end face is connected to a high-voltage terminal board, a low-voltage terminal board or another lightning arrester component. In this embodiment, a threaded hole 311 is provided at the center of the upper flange 31, and a flange protrusion 312 of a certain length is provided at a corresponding position inside the upper flange 31 to ensure the depth of the thread.

[0051] The core group 1 is the same as the implementation example 1, which is formed by stacking resistors 11, and a conductive pad 12 may be included in the middle of the resistor. A conductive tube 82 is provided at the lower end of the core group, which can be used to place a desiccant, and the outer diameter is similar to the diameter of the resistor. The lower end face of the conductive tube can be directly placed on the inner end face of the lower flange 32, and a groove can be opened at the corresponding position of the flange end face to limit its movement. A conductive pad 12 is provided between the upper end face of the conductive tube 82 and the core group 1 to ensure good contact between the resistor 11 and avoid damaging the end face of the resistor 11.

[0052] The elastic module 4 is basically the same as that in implementation case 1, except that a guide sleeve 44 is provided between the elastic member 42 and the upper flange 31 , the inner hole of which cooperates with the guide shaft 41 , the lower end face is located on the elastic member 42 , and the upper end face cooperates with the upper flange 31 .

[0053] The structure of the insulating tile 5 and the arrangement of the insulating tile 5 inside the arrester are consistent with those of the implementation case 1. The main difference is that the positioning method of the insulating tile 5 is different. The two ends of the insulating tile 5 are positioned by positioning plates 6. Figure 5 As shown, one or more long protrusions 61a and short protrusions 62b can also be provided on the outer circle of the positioning plate 6. The long protrusion 61a cooperates with the second groove 213 on the end surface of the cylinder 21 to position the positioning plate. One or more first grooves 62 are formed between adjacent protrusions of the positioning plate 6. One or more insulating tiles 5 are arranged in the first grooves 62 of the positioning plate 6. The first grooves 62 cooperate with the inner wall of the cylinder 21 to limit the insulating tiles and ensure the stability of the core group. An axial clearance hole 63 is provided in the middle of the positioning plate 6 for passing through the flange protrusion 312 inside the upper flange 31. The positioning plate can be in various forms. This embodiment provides two forms, such as Figure 5 Positioning plates 6a and 6b are shown.

[0054] In a longer core group, a positioning plate 6 in the embodiment 1 can be added in the middle of the core group 1 to enhance the fixation of the insulating tile and ensure the stable positioning of the insulating tile.

[0055] As described in Example 1, an airflow channel along the axis of the resistor is formed between adjacent insulating tiles 5, which can evenly transfer the internal pressure to the explosion-proof groove on the cylinder 21 during the short circuit process, quickly open the weak explosion-proof groove, release the internal pressure and arc, and avoid the accumulation of pressure inside the housing 2 to cause a crushing explosion.

[0056] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-reliability insulating tile plate lightning arrester, comprising a core group (1), a housing (2), an end module (3) and an elastic module (4); The core group (1) is formed by stacking at least a plurality of cylindrical resistor sheets (11); The shell (2) provides a cavity and mechanical support for the core group (1); The end modules (3) are arranged at both ends of the outer shell (2) to form a closed cavity required by the core group (1); The elastic module (4) is composed of a guide shaft (41), an elastic element (42) and a conductive copper strip (43), and provides an axial pressing force for the core group (1) to ensure good contact of the end surface of the resistor (11); and is characterized in that: It also includes at least one insulating tile (5) and a positioning plate (6); The insulating tile (5) is made of an insulating material and is arranged in the circumferential direction of the core group (1) and is located between the outer wall of the core group (1) and the inner wall of the cylinder (21) of the outer shell (2); and is used to limit the radial movement of the resistor (11); The positioning plate (6) is arranged at the two ends of the core group (1) or between the resistor sheets (11), and is provided with a first groove (62) on the circumference for positioning the insulating tile plate (5).

2. The high reliability insulating tile arrester according to claim 1 is characterized in that: The insulating tile plate (5) is an arched plate (51) made of insulating material, and a buffer layer (52) is completely or partially wrapped on the outer wall of the arched plate (51).

3. The high reliability insulating tile arrester according to claim 2 is characterized in that: The buffer layer (52) is a soft insulating material and is formed on the arched plate (51) by vulcanization molding or heat shrink molding using a heat shrink tube.

4. The high reliability insulating tile arrester according to claim 1 is characterized in that: At least one first groove (62) is provided in the circumferential direction of the positioning plate (6); the insulating tile (5) is inserted into the first groove (62) of the positioning plates (6) at both ends; the first groove (62) and the inner wall of the cylinder (21) restrict the movement of the insulating tile (5), so that the insulating tile (5) is always arranged in the circumferential direction of the core group (1).

5. The high reliability insulating tile arrester according to claim 1, 2 or 4, characterized in that: The shell (2) is a composite insulator or a ceramic hollow insulator, and flanges (23, 24) are provided at both ends of the insulator.

6. The high reliability insulating tile arrester according to claim 5 is characterized in that: At least one second protrusion (231) and a third groove (232) are provided on the inner circle of the sealing surface of the flange (23, 24); the third groove (232) on the flanges (23, 24) at both ends is aligned vertically, and its diameter is equal to the inner diameter of the cylinder (21).

7. The high reliability insulating tile arrester according to claim 1 or 4, characterized in that: The outer diameters of the first grooves (62) of all positioning plates (6) are equal; or the outer diameters of the first grooves (62) are grooves (62a, 62b) of two different diameters, wherein the diameter of the large groove (62b) is equal to the diameter of the resistor (11), and the outer diameter of the small groove (62a) is slightly larger than the diameter of the resistor (11), so as to limit the radial movement of the insulating tile (5).

8. The high reliability insulating tile arrester according to claim 1 or 2, characterized in that: The two ends of the insulating tile (5) are located between the third groove (232) of the flange (23, 24) and the small groove (62a) of the positioning plate (6), and the movement of the insulating tile (5) is restricted by the third groove (232) of the flange (23, 24) and the small groove (62a) on the positioning plate 6.

9. The high reliability insulating tile arrester according to claim 1, 2 or 4, characterized in that: At least one fifth groove (211) for releasing pressure during a short circuit may be provided on the circumference of the cylinder (21); the shape of the fifth groove (211) is a regular geometric shape; the fifth groove (211) is a through groove or a blind hole groove.

10. The high reliability insulating tile arrester according to claim 1, 2 or 4, characterized in that: At both ends of the cylinder (21), one or more second grooves (213) are provided for positioning the positioning plate (6).

11. The high reliability insulating tile arrester according to claim 1, 2 or 4, characterized in that: The first protrusion (61) of the positioning plate (6) comprises a long protrusion (61a) and a short protrusion (61b), wherein the long protrusion (61a) cooperates with the second grooves (213) on both ends of the cylinder (21) to position the positioning plate (6).

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