An AC surge arrester

Abstract

This application discloses an AC surge arrester, relating to the field of surge arrester technology, including a mounting bracket, a surge arrester body, a circular plate, a support base, a protective shell, a pressure column assembly, and an installation unit. The support base has a cylindrical placement groove in its center for placing the pressure column assembly. The pressure column assembly is vertically slidably inserted into the placement groove of the support base, and the pressure column assembly is electrically connected to the circular plate via soft copper braid, enabling the pressure column assembly to conduct to the high-voltage end of the valve plate of the surge arrester body. The installation unit is mounted on the support base and is used to clamp and fix the pressure column assembly. The outer ring of the pressure column assembly body is surrounded by a corrugated tube structure, with a protruding section in the middle of the tube forming a wall-attached section. The outer surface of the wall-attached section is coated with a semiconductor layer. This design achieves the technical effects of reducing the risk of electric shock during operation and maintenance, adapting to the deformation of the pressure column under lightning strikes for anti-lock disassembly, actively and dynamically sealing to improve dust and moisture protection, and radially rigidly locking to prevent movement.

Description

Technical Field

[0001] This invention relates to the field of surge arrester technology, and more particularly to an AC surge arrester. Background Technology

[0002] AC surge arresters are key protective devices used in power systems to limit overvoltage. They are divided into conventional AC surge arresters and gap AC surge arresters. The former uses a gapless zinc oxide structure, and its valve plates are subjected to power frequency voltage for a long time, which poses the risk of leakage current and aging and heating. The latter has an air gap connected in series on the high-voltage side of the surge arrester, so that the surge arrester body is in zero-voltage "standby" during normal operation and is only put into short-term operation after the gap breaks down during a lightning strike, thus extending its service life and reducing the pressure of operation and maintenance.

[0003] Regarding the installation and use of AC surge arresters with gaps, Chinese invention patent CN119361272B discloses an AC surge arrester with gaps, including an arrester body and a pressure column. A stainless steel current-carrying ring is installed on the pressure column. The arrester body is equipped with a support base with a chamber for the pressure column to slide up and down. This invention utilizes the cooperation between a pressure plate, a first spring, a right-angle baffle, a clamping mechanism, a squeezing mechanism, and a limiting mechanism. When installing the stainless steel current-carrying ring, the pressure column is fully inserted into the support base, and then the pressure plate is pressed down to fix the stainless steel current-carrying ring. When disassembling the stainless steel current-carrying ring, the pressure plate is pressed down to its maximum extent to release the fixation of the stainless steel current-carrying ring, and then the stainless steel current-carrying ring can be removed. The entire disassembly and assembly process only requires one hand for the operator, who can use the other hand to grab an external object for stability. This not only improves the convenience of operation for the operator but also enhances operational safety.

[0004] While the above-mentioned solution improves operational efficiency to some extent, in actual use, the support base directly receives the high-voltage potential of the valve plate, causing the exposed adjustment and clamping components to be energized. Maintenance personnel must wear full high-voltage protective gear, posing a high risk of working at height. Furthermore, the pressure column and support base use a small-clearance fit, without allowing for radial deformation under lightning strike conditions. This causes the pressure column to expand under impact loads, easily seizing against the tank wall and damaging components during disassembly. Additionally, outdoor dust, rain, and condensation can easily cause corrosion and jamming of the internal clamping components, shortening the maintenance-free cycle. Moreover, under extreme wind vibration, the pressure column is prone to axial movement, causing the drainage ring gap to shift, affecting protection characteristics and severely impacting operational reliability. Summary of the Invention

[0005] This application provides an AC surge arrester that solves the technical problems in the prior art, such as high risk of electric shock during operation and maintenance, lack of radial deformation margin leading to disassembly jamming after lightning strike, lack of active sealing leading to dust and rain intrusion and corrosion, and insecure clamping leading to axial movement and gap displacement under extreme wind vibration. It achieves the technical effects of reducing the risk of electric shock during operation and maintenance, adapting to anti-lock disassembly under lightning impact and column deformation, improving dust and moisture protection effect with active dynamic sealing, and radial rigid locking to prevent movement.

[0006] This application provides an AC surge arrester, including a mounting bracket, a surge arrester body, a circular plate, a support base, a protective shell, a pressure column assembly, and an installation unit; the support base has a cylindrical placement groove in the middle for placing the pressure column assembly, the pressure column assembly is vertically slidably inserted into the placement groove of the support base, and the pressure column assembly is electrically connected to the circular plate through a soft copper braid, so that the pressure column assembly is connected to the high-voltage end of the valve plate of the surge arrester body;

[0007] The installation unit is mounted on the support base and is used to clamp and fix the pressure column assembly; the pressure column assembly body is surrounded by a corrugated tube, the middle of which protrudes outward to form a wall-attached section, and the outer surface of the wall-attached section is coated with a semiconductor layer.

[0008] Furthermore, the mounting bracket is fixed to the tower crossarm by bolts; the bottom of the surge arrester body is fixedly connected to the mounting bracket to achieve grounding, and its top is fixedly connected to the circular plate; the high-voltage end of the surge arrester body valve plate is led out from the circular plate; the top of the circular plate is fixedly connected to a support plate and a rectangular frame from bottom to top, and an insulating flange is provided between the rectangular frame and the support base to make the support base ground potential and rotatable; the diameter of the placement groove is 1.3 times the diameter of the pressure column assembly, which is used to accommodate the slight deformation of the pressure column assembly under lightning strike conditions and prevent disassembly jamming; the protective shell is a box-shaped structure, inverted and fixed above the support base, and a square through slot is opened on the top of the protective shell to protect the internal components of the support base, and the pressure column assembly passes through the square through slot.

[0009] Furthermore, the pressure column assembly includes a drainage ring, a connecting plate, and a pressure column body;

[0010] The drainage ring is a stainless steel semi-circular ring structure with its opening facing the high-voltage conductor. It is fixedly connected to the top of the pressure column through a connecting plate. The pressure column adopts a cylindrical rod structure, which is fixed below the connecting plate. Its surface is plated with hard chrome and polished. Multiple clamping surfaces are evenly opened along its circumference at its lower end.

[0011] Furthermore, the installation unit includes a rotating ring, a clamping block, a second spring, a driven block, an adjusting plate, adjusting bolts, and a fixing plate;

[0012] The rotating ring is rotatably connected to the support base. Multiple abutment blocks are uniformly fixed along the circumference of the inner circumference of the rotating ring. Multiple clamping blocks are provided, evenly arranged along the circumference of the rotating ring, corresponding to the positions of the abutment blocks. Each clamping block is radially slidably connected to the support base via a second spring, and is used to clamp and fix the clamping surface of the pressure column to achieve the installation of the drainage ring. A driven block is fixed to the side of the clamping block near the second spring.

[0013] An adjusting plate is fixed to the outer side of the rotating ring, and the adjusting plate extends to the outside of the support base; a position groove is opened on the outer side of the support base, and the adjusting plate slides in the position groove; the fixing plate is placed vertically and fixed to the outside of the support base; the adjusting bolt is rotatably connected to the fixing plate by a threaded connection, and its end is connected to the slider in the adjusting plate by a ball joint, and the slider is slidably connected in the adjusting plate.

[0014] The driven block has a guide slope on the side near the abutting block. The abutting block has a trapezoidal structure, and its slope structure corresponds to the guide slope of the driven block.

[0015] Furthermore, the outer wall of the support base is rotatably hinged with an adjustment box, which covers the position groove and fixing plate of the support base when closed; the contact surface between the adjustment box and the support base is embedded with a magnetic strip, which is fixed by magnetic attraction when closed.

[0016] Furthermore, the top of the support base is uniformly provided with sliding grooves along the circumference of the placement groove, and the sliding grooves are L-shaped structures; each clamping block has an abutment rod fixed on the side away from the pressure column, and the abutment rod is U-shaped, vertically arranged and radially slidably connected in the sliding groove; the horizontal section at the upper end of the abutment rod extends to the outer side of the top of the support base, and the end of the horizontal section at the upper end faces the pressure column.

[0017] Furthermore, the positioning sleeve, the surrounding tube, the connecting block, and the spring are all included.

[0018] The positioning sleeve is a nylon sleeve structure, which is fixedly sleeved on the outer ring of the upper end of the pressure column; the surrounding tube is a corrugated tube structure, the upper end of which is slidably connected to the inner upper end of the outer wall of the positioning sleeve through multiple connecting blocks, and the lower end of which is fixed on the outer wall of the positioning sleeve; the connecting blocks are evenly arranged along the circumference of the pressure column and correspond one-to-one with the abutment rod.

[0019] The connecting block is slidably connected to the inner upper end of the outer wall of the positioning sleeve by a spring; a soft copper braid is fixed to the side of the bottom end of the pressure column, the soft copper braid is laid along the outside of the positioning sleeve and its other end is anchored to the circular plate, forming a conduction path for lightning current.

[0020] Furthermore, the connecting block and the opposing surface of the abutting rod are provided with a guide slope, and the horizontal section at the upper end of the abutting rod is also provided with a guide slope that cooperates with the connecting block.

[0021] Furthermore, when the middle part of the enclosure tube bulges outward, it forms an annular wall-attaching section. The outer diameter of the wall-attaching section is larger than the inner diameter of the placement groove of the support seat. When the middle part of the enclosure tube bulges outward to form the wall-attaching section, the wall-attaching section abuts against the inner wall of the placement groove of the support seat and closes the placement groove. The enclosure tube is made of phenyl vinyl silicone rubber as the matrix, with 40% aluminum hydroxide flame-retardant filler and 15% calcined kaolin added for reinforcement, and is formed by compression molding and vulcanization.

[0022] The semiconductor layer is made of silicone rubber composite material filled with acetylene black, and is integrally formed with the outer surface of the wall section of the surrounding tube through a co-vulcanization process; the semiconductor layer is used to smoothly transition the high potential of the outer wall of the positioning sleeve to the ground potential of the support base, eliminate the potential difference between the two, and avoid pre-breakdown arc.

[0023] Furthermore, the outer layer of the pressure column body is an insulating sleeve layer, which is made of phenyl silicone rubber and has a 0.5mm air gap between its outer wall and the inner wall of the surrounding tube.

[0024] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0025] By using an insulating flange to isolate the rectangular frame and the support base, the support base is kept at ground potential, eliminating the risk of electric shock from heights. Rotating the adjusting bolt drives the rotating ring to rotate, causing the clamping block to radially clamp the pressure column, achieving rapid locking and gap stabilization of the drain ring. The clamping block, in conjunction with the contact rod, presses down on the connecting block, pushing the corrugated pipe's central bulge against the tank wall, achieving active sealing of the placement tank to prevent dust and rain. The semiconductor layer on the outer surface of the casing contacts the inner wall of the ground potential support base, smoothly transitioning the suspended high potential on the surface of the pressure column to ground potential, eliminating the risk of pre-breakdown arcing. A soft copper braided bypass insulating flange is used. Connecting the pressure column to the high-voltage end of the valve plate ensures reliable discharge of lightning current; the adjustment mechanism is protected by a magnetic adjustment box to prevent rain and dust erosion and accidental loosening, thus extending the maintenance cycle; it effectively solves the technical problems of high risk of electric shock during maintenance, lack of radial deformation margin leading to disassembly jamming after lightning strike, lack of active sealing leading to dust and rain intrusion and corrosion, and insecure clamping leading to axial movement and gap displacement under extreme wind vibration. It achieves the technical effects of reducing the risk of electric shock during maintenance, adapting to the deformation of the pressure column under lightning impact for anti-lock disassembly, active dynamic sealing to improve dust and moisture protection, and radial rigid locking to prevent movement. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an AC surge arrester according to the present invention.

[0027] Figure 2 This is a side view of the support base, pressure column assembly, and installation unit of an AC surge arrester according to the present invention.

[0028] Figure 3 This is a three-dimensional structural diagram of the pressure column assembly of an AC surge arrester according to the present invention.

[0029] Figure 4 This is a longitudinal structural cross-sectional view of the pressure column assembly of an AC surge arrester according to the present invention.

[0030] Figure 5 This invention relates to an AC surge arrester. Figure 4 A magnified view of a portion of point A in the middle.

[0031] Figure 6 This is a schematic diagram of the internal structure of the support base, pressure column assembly and installation unit of an AC surge arrester according to the present invention.

[0032] Figure 7 This is a longitudinal full sectional view of the support base, pressure column assembly and installation unit of an AC surge arrester according to the present invention.

[0033] Figure 8 This invention relates to an AC surge arrester. Figure 7 A magnified view of a portion of point B in the middle.

[0034] Figure 9 This is a schematic diagram of the pressure column assembly and installation unit of an AC surge arrester according to the present invention.

[0035] Figure 10 This invention relates to an AC surge arrester. Figure 9 Full sectional view along the CC axis.

[0036] Figure 11 This is a transverse full sectional view of the support base and mounting unit of an AC surge arrester according to the present invention.

[0037] Figure 12 This is a schematic diagram of the internal structure of the support base and regulating box of an AC surge arrester according to the present invention.

[0038] In the diagram: 100, mounting bracket; 101, soft copper braided strip; 110, surge arrester body; 120, circular plate; 130, support base; 131, protective shell; 132, sliding groove; 133, positioning groove; 140, pressure column assembly; 141, current-draining ring; 142, connecting plate; 143, pressure column body; 144, positioning sleeve; 145, surrounding tube; 146, connecting block; 147, spring one; 200, mounting unit; 210, rotating ring; 211, abutting block; 220, clamping block; 221, spring two; 230, driven block; 240, adjusting plate; 250, adjusting bolt; 251, fixing plate; 260, abutting rod; 270, adjusting box. Detailed Implementation

[0039] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0040] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Example 1: As Figures 1 to 6 As shown, this application discloses an AC surge arrester, which includes a mounting bracket 100, a surge arrester body 110, a circular plate 120, a support base 130, a protective shell 131, a pressure column assembly 140, and a mounting unit 200.

[0043] The support base 130 has a cylindrical placement groove in the middle for placing the pressure column assembly 140. The pressure column assembly 140 is vertically slidably inserted into the placement groove of the support base 130, and the pressure column assembly 140 is electrically connected to the circular plate 120 through the soft copper braid 101, so that the pressure column assembly 140 is connected to the high voltage end of the valve plate of the surge arrester body 110.

[0044] The installation unit 200 is mounted on the support base 130 and is used to clamp and fix the pressure column assembly 140. The pressure column assembly 140 is surrounded by a corrugated tube 145, and the middle part of the tube 145 protrudes outward to form a wall-attached section. The outer surface of the wall-attached section is coated with a semiconductor layer.

[0045] like Figures 1 to 7As shown, the mounting bracket 100 is fixed to the tower crossarm by bolts; the bottom of the surge arrester body 110 is fixedly connected to the mounting bracket 100 to achieve grounding, and its top is fixedly connected to the circular plate 120; the circular plate 120 leads out the high-voltage end of the valve plate of the surge arrester body 110; the top of the circular plate 120 is fixedly connected to a support plate and a rectangular frame from bottom to top, and an insulating flange is provided between the rectangular frame and the support base 130, so that the support base 130 is at ground potential and can rotate; the diameter of the placement groove is 1.3 times the diameter of the pressure column assembly 140, which is used to accommodate the slight deformation of the pressure column assembly 140 under lightning strike conditions and prevent disassembly jamming; the protective shell 131 is a box-shaped structure, inverted and fixed above the support base 130, and the top of the protective shell 131 has a square through slot for protecting the internal components of the support base 130, and the pressure column assembly 140 passes through the square through slot. The surge arrester body 110 is a zinc oxide valve plate composite insulation structure.

[0046] This application addresses the issue of high voltage potential and high risk of electric shock for maintenance personnel by adding an insulating flange between the rectangular frame and the support base 130. Specifically, the insulating flange electrically isolates the support base 130 from the high-voltage rectangular frame, maintaining the support base 130 at ground potential. Exposed maintenance components on the support base 130, such as the mounting unit 200, adjustment box 270, and adjustment bolts 250, are all at ground potential and can be touched without high-voltage protection, thus improving the safety of high-altitude live-line maintenance. Furthermore, by setting the diameter of the placement groove of the support base 130 to 1.3 times the diameter of the pressure column 143, this application solves the problem of radial deformation of the pressure column 143 under lightning strike conditions, which can cause disassembly jamming. Specifically, the 0.3 times diameter margin allows for lightning-induced deformation space, preventing the pressure column 143 from being squeezed against the inner wall of the placement groove. This eliminates the need for forced prying when disassembling the pressure column assembly 140, reducing disassembly difficulty, preventing component scratch damage, and improving maintenance efficiency.

[0047] like Figures 1 to 3 As shown, the pressure column assembly 140 includes a drainage ring 141, a connecting plate 142, and a pressure column body 143;

[0048] The drainage ring 141 is a stainless steel semi-circular ring structure with its opening facing the high-voltage conductor. It is fixedly connected to the top of the pressure column 143 via a connecting plate 142. The pressure column 143 is a cylindrical rod-shaped structure, fixed below the connecting plate 142, with its surface plated with hard chrome and polished. Multiple clamping surfaces are evenly distributed along its circumference at its lower end. Specifically, during component manufacturing, a square guide groove can be vertically machined on the inner side of the pressure column 143, and a square guide block corresponding to the guide groove can be set on the side of the placement groove inside the support base 130. This allows the pressure column 143 to automatically align circumferentially when vertically inserted into the placement groove. This is not shown in the attached drawings as it is prior art. The machining position can be determined during machining and will not be elaborated here.

[0049] like Figures 1 to 11 As shown, the installation unit 200 includes a rotating ring 210, a clamping block 220, a second spring 221, a driven block 230, an adjusting plate 240, an adjusting bolt 250, and a fixing plate 251;

[0050] The rotating ring 210 is rotatably connected to the support base 130. Multiple abutment blocks 211 are uniformly fixed along the circumference of the inner circumferential surface of the rotating ring 210. Multiple clamping blocks 220 are provided, evenly arranged along the circumference of the rotating ring 210, corresponding to the positions of the abutment blocks 211. The clamping blocks 220 are radially slidably connected to the support base 130 via spring 221, and are used to clamp and fix the clamping surface of the pressure column 143 to achieve the installation of the drainage ring 141. A driven block 230 is fixed to the side of the clamping block 220 near spring 221.

[0051] An adjusting plate 240 is fixed to the outer side of the rotating ring 210, and the adjusting plate 240 extends to the outside of the support base 130; a position groove 133 is provided on the outer side of the support base 130, and the adjusting plate 240 slides in the position groove 133; the fixing plate 251 is placed vertically and fixed to the outside of the support base 130; the adjusting bolt 250 is rotatably connected to the fixing plate 251 by a threaded connection, and its end is connected to the slider in the adjusting plate 240 by a ball joint, and the slider is slidably connected in the adjusting plate 240;

[0052] The driven block 230 has a guide slope on the side near the abutting block 211. The abutting block 211 has a trapezoidal structure, and its slope structure corresponds to the guide slope of the driven block 230.

[0053] like Figure 2 and Figure 12As shown, an adjustment box 270 is rotatably hinged to the outer wall of the support base 130. When closed, the adjustment box 270 covers the position groove 133 and the fixing plate 251 of the support base 130. A magnetic strip is embedded in the contact surface between the adjustment box 270 and the support base 130, and the adjustment box is fixed by magnetic attraction when closed. The outer wall of the support base 130 may be embedded with a magnetic material that cooperates with the magnetic strip.

[0054] It should be noted that, as Figure 10 and Figure 11 As shown, each of the clamping blocks 220 is slidably connected to the support base 130 via a guide slider. Inside the support base 130, there are multiple linear guide rails corresponding to the radial sliding direction of the multiple clamping blocks 220. The multiple linear guide rails are evenly arranged along the circumference of the placement groove and correspond one-to-one with the clamping blocks 220 to ensure the sliding straightness of the multiple clamping blocks 220, ensure synchronous action, and avoid easy deviation and jamming. The linear guide rails and the corresponding guide sliders are existing technologies and will not be described in detail in the accompanying drawings and description.

[0055] This application solves the problem of unreliable axial fixation between the drainage ring 141 and the pressure column 143 by using the contacting cooperation of the rotating ring 210, the abutting block 211, the driven block 230 and the clamping block 220, and the self-restoration under the action of the spring 221. Specifically, this application sets up a pressure column assembly 140 and an installation unit 200. That is, by manually placing the pressure column assembly 140 into the placement slot, and then pulling and opening the adjustment box 270, by rotating the adjustment bolt 250, the multi-degree-of-freedom ball joint and the movement of the slider in the adjustment plate 240 can drive the adjustment plate 240 and the rotating ring 210 to rotate, so that the inclined surface of the abutment block 211 slides and abuts against the guide inclined surface of the driven block 230, thereby synchronously pushing multiple clamping blocks 220 to move radially inward, and jointly clamping and locking the clamping surface at the lower end of the pressure column 143, so that the pressure column 143 has no risk of upward movement under extreme working conditions, thereby ensuring the stability of the gap between the drain ring 141 and the high-voltage wire.

[0056] This application, by providing a magnetic adjustment box 270 on the outer wall of the support base 130, ensures that the mounting unit 200 and its components, as well as the interior of the support base 130, are not corroded from the position groove 133, thus preventing accidental loosening. Specifically, the magnetic strip on the contact surface of the adjustment box 270 automatically attracts and fixes itself in place, thereby covering the position groove 133 of the support base 130 and the fixing plate 251. This protects the threaded pairs of the adjustment plate 240 and the adjustment bolt 250 from dust and rain corrosion, while also preventing accidental contact that could lead to clamping failure, further improving the reliability of the adjustment mechanism.

[0057] like Figures 6 to 9As shown, the top of the support base 130 is evenly provided with a sliding groove 132 along the circumference of the placement groove, and the sliding groove 132 has an L-shaped structure; each clamping block 220 has an abutment rod 260 fixed on the side away from the pressure column 143, and the abutment rod 260 has a U-shaped structure, is arranged vertically and is radially slidably connected in the sliding groove 132; the horizontal section of the upper end of the abutment rod 260 extends to the outer side of the top of the support base 130, and the end of the horizontal section at the upper end faces the pressure column 143.

[0058] like Figures 3 to 8 As shown, the pressure column assembly 140 also includes a positioning sleeve 144, a surrounding tube 145, a connecting block 146, and a spring 147;

[0059] The positioning sleeve 144 is a nylon sleeve structure, fixedly fitted onto the outer ring of the upper end of the pressure column 143; the surrounding tube 145 is a corrugated pipe structure, its upper end is slidably connected to the inner upper end of the outer wall of the positioning sleeve 144 through multiple connecting blocks 146, and its lower end is fixed to the outer wall of the positioning sleeve 144; the connecting blocks 146 are evenly arranged around the circumference of the pressure column 143 and correspond one-to-one with the abutment rod 260; the connecting blocks 146 are slidably connected to the inner upper end of the outer wall of the positioning sleeve 144 through springs 147; a soft copper braided strip 101 is fixed to the side of the bottom end of the pressure column 143, the soft copper braided strip 101 is laid along the outside of the positioning sleeve 144 and its other end is anchored to the circular plate 120, forming a conduction path for lightning current. That is, the positioning sleeve 144 is an insulator.

[0060] It should be noted that the soft copper braided tape 101 is arranged in the form of passing through the insulating flange, support plate and rectangular frame, and its specific winding method and position correspond to the position of the through holes on the components to achieve high voltage conduction, such as... Figure 7 The figure shows a simplified connection method for the soft copper braided tape 101. The actual winding method and position are not shown in detail in the figure. This is existing technology and can be adapted during the actual processing and manufacturing process, so it will not be described in detail.

[0061] like Figure 7 and Figure 8 As shown, the connecting block 146 and the abutment rod 260 are provided with a guide slope on their opposite surfaces, and the horizontal section at the upper end of the abutment rod 260 is also provided with a guide slope that cooperates with the connecting block 146.

[0062] When the middle part of the enclosure tube 145 protrudes outward, it forms an annular wall-attaching section. The outer diameter of the wall-attaching section is larger than the inner diameter of the placement groove of the support seat 130. When the middle part of the enclosure tube 145 protrudes outward to form the wall-attaching section, the wall-attaching section abuts against the inner wall of the placement groove of the support seat 130 and closes the placement groove. The enclosure tube 145 uses phenyl vinyl silicone rubber as the matrix, with 40% aluminum hydroxide flame-retardant filler and 15% calcined kaolin added for reinforcement, and is formed by compression molding and vulcanization. The semiconductor layer is made of silicone rubber composite material filled with acetylene black, and is integrally formed with the outer surface of the wall-attaching section of the enclosure tube 145 through a co-vulcanization process. The semiconductor layer is used to smoothly transition the high potential of the outer wall of the positioning sleeve 144 to the ground potential of the support seat 130, eliminate the potential difference between the two, and avoid pre-breakdown arc.

[0063] It needs to be specifically explained that, such as Figure 2 and Figure 7 As shown, the size of the square through groove opened at the top of the protective shell 131 is larger than the diameter of the pressure column 143 and smaller than the size of the connecting plate 142, so as to ensure that the pressure column 143 can smoothly pass through the square through groove, and the area covered by the top of the protective shell 131 (excluding the square through groove) can cover all the areas where the sliding groove 132 is located, ensuring that the sliding groove 132 is not directly exposed to the outside. At the same time, the height of the pressure column 143 is greater than the height of the protective shell 131.

[0064] This application solves the problem that the lack of active sealing at the gap between the pressure column 143 and the support seat 130, which easily leads to dust and rain intrusion and affects its internal components, by setting the linkage between the abutment rod 260, the connecting block 146, the spring 147 and the corrugated pipe structure enclosure 145. Specifically, when the clamping block 220, driven by the rotating ring 210 and the abutment block 211, radially clamps and presses the column 143 inward, it can drive the U-shaped abutment rod 260 fixed on the clamping block 220 to move inward synchronously. When the guide slope at the upper end of the abutment rod 260 abuts the guide slope of the connecting block 146, that is, as the abutment rod 260 moves inward, it can push the connecting block 146 down along the outer wall of the positioning sleeve 144, thereby compressing the spring 147 and driving the upper end of the enclosure tube 145 to move downward, so that the originally inwardly recessed middle part of the enclosure tube 145 protrudes outward to form an annular wall-attaching section. The wall-attaching section abuts the inner wall of the placement groove of the support seat 130, sealing the annular gap of the placement groove, thereby isolating external rainwater, dust, and condensation from entering the placement groove; at the same time, a protective shell 131 (i.e., as shown in the image) is provided. Figure 7 As shown, the top opening of the protective shell 131 can cover the lateral distance of the horizontal section of the slide groove 132, but can accommodate the diameter of the pressure column 143. This can prevent the sliding pairs such as the internal slide groove 132 and the clamping block 220 from rusting and getting stuck, thereby extending the operation and maintenance cycle.

[0065] Considering the ground potential setting of the support base 130, while completely eliminating the risk of electric shock during high-altitude operations, a new problem arises: under lightning strike conditions, the pressure column 143 carries a high potential, while the support base 130 is at ground potential. If an uncontrolled potential difference exists between the two, it can easily trigger a pre-breakdown arc in the tiny air gap between the inner wall of the enclosure tube 145 and the support base 130. This will not only burn the silicone rubber matrix of the enclosure tube 145 but also induce continuous partial discharge, accelerate insulation aging, and in severe cases, even lead to surface flashover, directly threatening the operational reliability of the surge arrester. Simultaneously, since the positioning sleeve 144 is made of nylon insulation material and cannot conduct potential, the high potential of the pressure column 143 will couple to the inner wall of the enclosure tube 145 through parasitic capacitance, further exacerbating the potential gradient between the inner and outer walls of the enclosure tube 145.

[0066] To address the safety hazards posed by the aforementioned potential difference, preferably, the volume resistivity of the semiconductor layer can be controlled within a certain range. to Within the specified range, the thickness can be selected as 0.8mm, and the axial width is preferably 18mm; the outer surface of the semiconductor layer can also be pressed with a diamond-shaped anti-slip texture with a depth of 0.1mm, and the edges of the texture are all rounded with R0.2mm.

[0067] Preferably, the outer layer of the pressure column 143 is an insulating sleeve layer, which is made of phenyl silicone rubber and has a 0.5mm air gap between its outer wall and the inner wall of the surrounding tube 145. The insulating sleeve layer preferably has a wall thickness of 2.0 to 3.0mm, and its inner wall is laminated with a 0.15mm thick ultra-high molecular weight polyethylene smooth friction-reducing layer.

[0068] This application addresses the issues of ground potential of the support 130, potential gradient abrupt changes under high voltage of the pressure column 143, and pre-breakdown arcing by setting an integrated co-sulfided semiconductor layer on the outer surface of the wall-attached section (i.e., the middle part of the support 145). Specifically, the volume resistivity of the semiconductor layer is controlled within a certain range. to The contact and conduction between the wall section and the inner wall surface of the support base 130 at ground potential can smoothly transition the high voltage potential of the pressure column 143 to the ground potential of the support base 130, eliminating the potential difference between the two. This can prevent the pre-breakdown arc or drilling effect insulation breakdown in the placement slot area under lightning strike or overvoltage conditions, and improve the overall insulation performance of the surge arrester.

[0069] The specific principle is as follows: First, by setting the outer layer of the pressure column 143 as an insulating sleeve layer, its dielectric thickness of 2.0mm to 3mm can bear the main part of the voltage drop. At the same time, a 0.5mm air gap is reserved between the outer wall of the insulating sleeve and the inner wall of the surrounding tube 145, which can extend the creepage distance and avoid rigid friction between the insulating sleeve and the surrounding tube 145. Second, by setting the middle of the surrounding tube 145 to form a wall-attaching section, and using a semiconductor layer filled with co-sulfurized acetylene black on the outer surface of the wall-attaching section, the semiconductor layer can be used to... to The gradient resistivity can smoothly transition the floating high potential of the inner wall of the enclosure 145 to the ground potential of the support 130, completely eliminating the potential difference between the two and avoiding the generation of pre-breakdown arc.

[0070] In actual operation, the steps of this embodiment are as follows:

[0071] S1: Fix the surge arrester body 110 to the predetermined position on the tower crossarm using the mounting bracket 100. Insert the entire pressure column assembly 140 into the placement groove of the support base 130 from top to bottom, so that the current-draining ring 141 is located at the predetermined gap position of the high-voltage conductor. Manually open the adjustment box 270 with one hand to expose the adjustment bolt 250. At this time, the soft copper braided tape 101 moves down with the pressure column assembly 140, and its end is anchored on the circular plate 120, completing the electrical connection on the high-potential side. Since the support base 130 is isolated from the rectangular frame by the insulating flange, the support base 130 is at ground potential, and there is no risk of electric shock during the installation process.

[0072] S2: Rotate the adjusting bolt 250, and push the adjusting plate 240 to slide along the position groove 133 through the ball joint structure, thereby driving the rotating ring 210 to rotate. The trapezoidal contact block 211 on the rotating ring 210 pushes the driven block 230 through the inclined surface cooperation, overcoming the tension of the spring 221, so that multiple clamping blocks 220 move radially inward synchronously, and together clamp the clamping surface at the lower end of the pressure column 143 to achieve rigid fixation of the drainage ring 141;

[0073] S3: As the clamping block 220 moves inward, the U-shaped abutment rod 260 connected to it moves inward along the slide groove 132. The guide slope at the upper end of the abutment rod 260 interacts with the guide slope of the connecting block 146, pushing the connecting block 146 to slide downward along the outer wall of the positioning sleeve 144, compressing the spring 147. The downward movement of the connecting block 146 causes the upper end of the enclosure tube 145 to press down, forcing the middle part of the originally inward-retracted enclosure tube 145 to bulge outward to form a wall-attached section, which fits tightly against the inner wall of the placement groove of the support seat 130. The semiconductor layer on its outer surface contacts and conducts with the inner wall surface of the support seat 130 with ground potential, which can smoothly transition the high potential of the outer wall of the positioning sleeve 144 to the ground potential, eliminating the potential difference. At the same time, the top of the placement groove is sealed by the protective shell 131 to achieve dust and rain protection.

[0074] S4: When the line is struck by lightning, the lightning current enters the surge arrester body 110 valve plate through the current-draining ring 141, the pressure column 143, and the soft copper braid 101, and is finally discharged to the ground. During this period, the insulating bushing undertakes the main insulation function, and the semiconductor layer of the surrounding tube 145 effectively suppresses the pre-breakdown arc and prevents insulation breakdown. When it is necessary to replace the current-draining ring 141 or perform maintenance, the adjusting bolt 250 is rotated in the reverse direction, the adjusting plate 240 moves back, the rotating ring 210 reverses, the clamping block 220 moves outward under the action of the second spring 221 to release the pressure column 143, and at the same time the contact rod 260 moves outward. The connecting block 146 moves upward to reset under the action of the first spring 147, which drives the middle part of the surrounding tube 145 to retract inward and separate from the inner wall of the support seat 130, releasing the seal. Finally, the entire pressure column assembly 140 can be pulled out of the placement slot for easy disassembly.

[0075] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0076] This application's AC surge arrester uses an insulating flange to isolate the rectangular frame and support base 130, maintaining the support base 130 at ground potential and eliminating the risk of electric shock at heights. Rotating the adjusting bolt 250 drives the rotating ring 210 to rotate, which in turn drives the clamping block 220 to radially clamp the column 143, achieving rapid locking and gap stabilization of the current-carrying ring 141. The clamping block 220, in conjunction with the contact rod 260, presses down on the connecting block 146, pushing the corrugated pipe's central part to bulge outwards and adhere tightly to the groove wall, achieving active sealing of the placement groove for dust and rain protection. The semiconductor layer on the outer surface of the surrounding pipe 145 is at ground potential. The inner wall of the support base 130 contacts the surface of the pressure column 143, smoothly transitioning the floating high potential to the ground potential and eliminating the risk of pre-breakdown arc. The pressure column 143 is connected to the high-voltage end of the valve plate by the bypass insulating flange of the soft copper braid 101, ensuring reliable discharge of lightning current. The adjustment mechanism is protected by the magnetic adjustment box 270 to prevent dust and rain erosion and accidental loosening, thus extending the maintenance cycle. This achieves the technical effects of reducing the risk of electric shock during maintenance, adapting to the deformation of the pressure column under lightning impact, preventing locking disassembly, improving the dust and moisture protection effect through active dynamic sealing, and radial rigid locking to prevent movement.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An AC surge arrester, characterized in that, It includes a mounting bracket (100), a surge arrester body (110), a circular plate (120), a support base (130), a protective shell (131), a pressure column assembly (140), and a mounting unit (200). The support base (130) has a cylindrical placement groove in the middle for placing the pressure column assembly 140. The pressure column assembly (140) is vertically slidably inserted into the placement groove of the support base (130), and the pressure column assembly (140) is electrically connected to the circular plate (120) through soft copper braid (101), so that the pressure column assembly (140) is connected to the high-voltage end of the valve plate of the surge arrester body (110). The mounting unit (200) is mounted on the support base (130) and is used to clamp and fix the pressure column assembly (140). The pressure column assembly (140) has a corrugated tube (145) surrounding its body. The middle part of the tube (145) protrudes outward to form a wall-attached section, and the outer surface of the wall-attached section is coated with a semiconductor layer.

2. The AC surge arrester according to claim 1, characterized in that, The mounting bracket (100) is fixed to the crossarm of the tower by bolts; the bottom of the surge arrester body (110) is fixedly connected to the mounting bracket (100) to achieve grounding and its top is fixedly connected to the circular plate (120); the circular plate (120) leads out the high-voltage end of the valve plate of the surge arrester body (110); the top of the circular plate (120) is fixedly connected to the support plate and the rectangular frame from bottom to top, and an insulating flange is provided between the rectangular frame and the support base (130) so that the support base (130) is at ground potential and can rotate; the diameter of the placement groove is 1.3 times the diameter of the pressure column assembly (140) to accommodate the slight deformation of the pressure column assembly (140) under lightning strike conditions and prevent disassembly jamming; the protective shell (131) is a box-shaped structure, inverted and fixed above the support base (130), and the top of the protective shell (131) is provided with a square through groove to protect the internal components of the support base (130) and the pressure column assembly (140) passes through the square through groove.

3. An AC surge arrester according to claim 1, characterized in that, The pressure column assembly (140) includes a drainage ring (141), a connecting plate (142), and a pressure column body (143). The drainage ring (141) is a stainless steel semi-circular ring structure with its opening facing the high-voltage conductor. It is fixedly connected to the top of the pressure column (143) through the connecting plate (142). The pressure column (143) adopts a cylindrical rod structure and is fixed below the connecting plate (142). Its surface is plated with hard chrome and polished. Multiple clamping surfaces are evenly opened along its circumference at its lower end.

4. An AC surge arrester according to claim 1, characterized in that, The installation unit (200) includes a rotating ring (210), a clamping block (220), a second spring (221), a driven block (230), an adjusting plate (240), an adjusting bolt (250), and a fixing plate (251); The rotating ring (210) is rotatably connected to the support base (130). Multiple abutment blocks (211) are uniformly fixed on the inner circumferential surface of the rotating ring (210) along its circumference. Multiple clamping blocks (220) are provided and are uniformly arranged along the circumference of the rotating ring (210), corresponding to the positions of the abutment blocks (211). The clamping blocks (220) are radially slidably connected to the support base (130) through spring two (221) and are used to clamp the clamping surface of the fixed pressure column (143) to realize the installation of the drainage ring (141). A driven block (230) is fixed on the side of the clamping block (220) close to spring two (221). An adjusting plate (240) is fixed to the outer side of the rotating ring (210), and the adjusting plate (240) extends to the outside of the support base (130); a position groove (133) is provided on the outer side of the support base (130), and the adjusting plate (240) slides in the position groove (133); the fixing plate (251) is placed vertically and fixed to the outside of the support base (130); the adjusting bolt (250) is rotatably connected to the fixing plate (251) by a threaded connection, and its end is connected to the slider in the adjusting plate (240) by a ball joint, and the slider is slidably connected in the adjusting plate (240); The driven block (230) has a guide slope on the side near the abutting block (211). The abutting block (211) has a trapezoidal structure, and its slope structure corresponds to the guide slope of the driven block (230).

5. An AC surge arrester according to claim 4, characterized in that, The outer wall of the support base (130) is rotatably hinged to an adjustment box (270). When the adjustment box (270) is closed, it covers the position groove (133) and the fixing plate (251) of the support base (130). The contact surface between the adjustment box (270) and the support base (130) is embedded with a magnetic strip, which is fixed by magnetic attraction when closed.

6. An AC surge arrester according to claim 1, characterized in that, The top of the support base (130) is evenly provided with a sliding groove (132) along the circumference of the placement groove. The sliding groove (132) has an L-shaped structure. Each clamping block (220) has a contact rod (260) fixed on the side away from the pressure column (143). The contact rod (260) has a U-shaped structure, is arranged vertically and is radially slidably connected in the sliding groove (132). The horizontal section of the upper end of the contact rod (260) extends to the outside of the top of the support base (130), and the end of the horizontal section at the upper end faces the pressure column (143).

7. An AC surge arrester according to claim 3, characterized in that, The pressure column assembly (140) also includes a positioning sleeve (144), a surrounding tube (145), a connecting block (146), and a spring (147). The positioning sleeve (144) is a nylon sleeve structure, which is fixedly sleeved on the upper outer ring of the pressure column (143); the surrounding tube (145) is a corrugated tube structure, the upper end of which is slidably connected to the inner side of the outer wall of the positioning sleeve (144) through multiple connecting blocks (146), and the lower end of which is fixed on the outer wall of the positioning sleeve (144); the connecting blocks (146) are evenly arranged along the circumference of the pressure column (143) and correspond one-to-one with the abutment rod (260); the connecting blocks (146) are slidably connected to the inner side of the outer wall of the positioning sleeve (144) through a spring (147); a soft copper braided strip (101) is fixed on the side of the bottom end of the pressure column (143), the soft copper braided strip (101) is laid along the outer side of the positioning sleeve (144) and its other end is anchored on the circular plate (120), forming a conduction path for lightning current.

8. An AC surge arrester according to claim 7, characterized in that, The connecting block (146) and the abutment rod (260) are provided with a guide slope on their opposite surfaces, and the horizontal section at the upper end of the abutment rod (260) is also provided with a guide slope that cooperates with the connecting block (146).

9. An AC surge arrester according to claim 1, characterized in that, When the middle part of the enclosure tube (145) bulges outward, it forms an annular wall-attaching section. The outer diameter of the wall-attaching section is larger than the inner diameter of the placement groove of the support seat (130). When the middle part of the enclosure tube (145) bulges outward to form the wall-attaching section, the wall-attaching section abuts against the inner wall of the placement groove of the support seat (130) and closes the placement groove. The enclosure tube (145) is made of phenyl vinyl silicone rubber as the matrix, with 40% aluminum hydroxide flame retardant filler and 15% calcined kaolin added for reinforcement, and is formed by molding and vulcanization. The semiconductor layer is made of silicone rubber composite material filled with acetylene black, and is integrally formed with the outer surface of the wall-attaching section of the enclosure tube (145) through a co-vulcanization process. The semiconductor layer is used to smoothly transition the high potential of the outer wall of the positioning sleeve (144) to the ground potential of the support base (130), eliminating the potential difference between the two and avoiding pre-breakdown arc.

10. An AC surge arrester according to claim 8, characterized in that, The outer layer of the pressure column (143) is an insulating sleeve layer, which is made of phenyl silicone rubber and has a 0.5mm air gap between its outer wall and the inner wall of the surrounding tube (145).

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