Zinc oxide lightning arrester and transformer substation

Abstract

The invention relates to a zinc oxide lightning arrester and a transformer substation, and relates to the technical field of lightning arresters, the zinc oxide lightning arrester comprises a silicone rubber jacket, a plurality of umbrella skirts fixedly arranged on the peripheral surface of the silicone rubber jacket, and sealing fittings for blocking openings at two ends of the silicone rubber jacket, and the silicone rubber jacket is internally provided with a plurality of resistance valve plates; an insulating sleeve arranged outside the resistance valve plate in a sleeving mode is arranged in the silicone rubber outer sleeve, a rainproof cap made of silicone rubber is arranged on the periphery of one end of the silicone rubber outer sleeve in a sleeving mode, and the inner wall of the rainproof cap abuts against the peripheral face of the silicone rubber outer sleeve; when the zinc oxide lightning arrester is installed in an outdoor severe environment along the vertical direction, the protective cap can be used for protecting the upper end of the zinc oxide lightning arrester in advance, so that the waterproof and moisture-proof performance of the zinc oxide lightning arrester is improved; when the lightning arrester is transported for a long distance, the two protective shells are detachably arranged outside the silicon rubber jacket, so that the possibility that the silicon rubber jacket is damaged in the transportation process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lightning arresters, and in particular to a zinc oxide lightning arrester and a substation. Background Art

[0002] A zinc oxide lightning arrester used in box-type substations is a key power protection device. Its core structure lies in a number of nonlinear resistor valve plates encapsulated inside a silicone rubber jacket. These valve plates are mainly made of zinc oxide material. Zinc oxide is widely used because of its excellent nonlinear volt-ampere characteristics, which makes the current of the lightning arrester extremely low under normal operating voltage, almost negligible (microampere or milliampere level). However, once an overvoltage condition occurs, its resistance will drop rapidly, thereby effectively discharging the overvoltage energy and achieving reliable protection of power equipment.

[0003] In the specific technical implementation, this type of arrester is usually composed of a silicone rubber jacket and a zinc oxide resistor valve sheet built into it. The outer periphery of the silicone rubber jacket is cleverly designed with an integrated umbrella skirt structure, which not only enhances the insulation performance of the arrester, but also improves its ability to resist dirt and ice and snow. In addition, sealing hardware is firmly installed at both ends of the silicone rubber jacket. The function of these hardware is to tightly seal the opening of the silicone rubber jacket to prevent interference and damage from the external environment.

[0004] However, in actual applications, especially when the arrester is installed outdoors in a vertical position, the joint between the top hardware and the silicone rubber jacket may become a potential sealing weakness. In severe weather with rain and snow, moisture from the outside may penetrate into the arrester through this tiny gap, causing adverse effects on the zinc oxide resistor valve plate, and even causing performance degradation or failure. This problem not only threatens the service life of the arrester itself, but may also pose a potential threat to the safety of the entire power system, and there is room for improvement. Summary of the invention

[0005] The purpose of the present application is to provide a zinc oxide lightning arrester and a substation to solve the problem of insufficient sealing performance at the joint between the top hardware and the silicone rubber jacket when the above-mentioned lightning arrester is used in harsh outdoor conditions along the vertical direction.

[0006] The zinc oxide arrester provided in this application adopts the following technical solution: A zinc oxide lightning arrester comprises a silicone rubber jacket, a plurality of sheds fixed on the outer circumference of the silicone rubber jacket, and sealing hardware for sealing the openings at both ends of the silicone rubber jacket, wherein a plurality of resistor valve sheets are arranged inside the silicone rubber jacket; an insulating sleeve is arranged inside the silicone rubber jacket and is sleeved on the outside of the resistor valve sheets; a rainproof cap made of silicone rubber is sleeved on the outer circumference of one end of the silicone rubber jacket, and the inner wall of the rainproof cap is tightly pressed against the outer circumference of the silicone rubber jacket.

[0007] By adopting the above technical scheme, when the zinc oxide lightning arrester is installed in a harsh outdoor environment in a vertical direction, due to the application of the rain cap, the staff can use the protective cap to protect the upper end of the zinc oxide lightning arrester in advance. At this time, the inner wall of the rain cap is tightly pressed against the outer peripheral surface of the silicone rubber jacket, so as to improve its waterproof and moisture-proof properties. The silicone material is resistant to aging for more than 20 years and has a long service life, reducing the possibility of external moisture penetrating into the interior from the joint between the silicone rubber jacket and the upper sealing hardware.

[0008] Optionally, two protective shells are symmetrically arranged on the outside of the silicone rubber jacket, and a protective cavity for the silicone rubber jacket to be placed is opened on the protective shell. A limiting piece for abutting against the outer periphery of the silicone rubber jacket is arranged on the inner wall of the protective cavity. The two protective shells can be detachably connected after being installed on the outside of the silicone rubber jacket.

[0009] By adopting the above-mentioned technical scheme, due to the combined arrangement of the protective shell and the limit piece, when the lightning arrester is transported over long distances, the two protective shells are detachably installed on the outside of the silicone rubber jacket, and the limit piece is used to hold the wrapped silicone rubber jacket tightly, so that the two protective shells can better protect the outside of the silicone rubber jacket, reducing the possibility of damage to the silicone rubber jacket during transportation.

[0010] Optionally, the overall length of the protective shell is adjustable, and the protective shell includes an upper half shell and a lower half shell, and an adjustment plate located outside the upper half shell is fixed on the side edge of the lower half shell facing the upper half shell, and the adjustment plate is slidably connected to the outer side of the upper half shell; a plurality of adjustment through holes are provided on the adjustment plate, and an adjustment screw hole that can overlap with the adjustment through hole is provided on the upper half shell, and an adjustment bolt that passes through the adjustment through hole and is screwed into the adjustment screw hole is provided on the outside of the silicone rubber jacket.

[0011] By adopting the above technical solution, due to the adjustable setting of the upper half shell and the lower half shell, the length of the protective shell can be adjusted according to actual needs; when the upper half shell and the lower half shell are slid and adjusted to a certain state, the adjusting bolt is passed through the adjusting through hole and then screwed into the adjusting screw hole, so that the overall length state of the protective shell in this state can be fixed, so that it can protect lightning arresters of different lengths and improve its performance.

[0012] Optionally, a guide ridge is fixedly provided on the outer surface of the upper half shell, and a guide groove for the guide ridge to be inserted and slide is opened on the adjustment plate, and the cross-sectional shapes of the guide ridge and the guide groove are both dovetail-shaped.

[0013] By adopting the above technical solution, due to the coordinated arrangement of the guide convex strip and the guide sliding groove, during the adjustment process of the upper half shell and the lower half shell, the stability of the two when sliding against each other is enhanced.

[0014] Optionally, the limiting members are a plurality of elastic abutment rings fixed on the inner walls of the upper half shell and the lower half shell, and the inner walls of the upper half shell and the lower half shell are provided with limiting grooves for the elastic abutment rings to be embedded and fixed, and the inner side surfaces of the elastic abutment rings can be tightly pressed against the outer peripheral surface of the silicone rubber jacket.

[0015] By adopting the above technical scheme, due to the setting of the limiting slot, during the installation of the elastic abutment ring, the elastic abutment ring can be embedded and fixed into the corresponding limiting slot, thereby facilitating the installation and fixation of the elastic abutment ring and improving the corresponding installation efficiency; when the protective shell protects the lightning arrester, the porcelain shell is located between the two protective shells, and the elastic abutment ring fixed on the inner wall of the protective shell is tightly pressed against the umbrella skirt structure on the silicone rubber jacket, thereby reducing the possibility of the lightning arrester being damaged by bumps during transportation.

[0016] Optionally, the upper half shell and the lower half shell are both made of conductive materials, and the side edge of the lower half shell away from the upper half shell is hinged to the outer peripheral edge of the sealing hardware; the two lower half shells can be rotated in the direction away from the silicone rubber jacket until the outer sides abut each other, and the ends of the two upper half shells away from the lower half shell can be fixed on the mounting surface in this state.

[0017] By adopting the above technical solution, due to the hinged setting of the upper half shell and the lower half shell, when the lightning arrester is installed and used, the two protective shells can be rotated to a vertical state in the direction away from the silicone rubber jacket, and then the flipped upper half shell can be fixed to the installation surface using screws or other means; and the installation height of the lightning arrester can be adjusted according to actual needs to improve the performance of the protective shell.

[0018] Optionally, a sealing plate is hinged on the side edge of the upper half shell away from the lower half shell, and a locking rod is provided on the outside of the silicone rubber jacket; locking blocks are fixed on the outer periphery of both ends of the locking plate, and an elastic clip is provided on the outer periphery of the locking block, a first locking groove is provided on the sealing plate, and a first locking groove for the elastic clip to be inserted into is provided on the inner wall of the first locking groove; when the protective shell protects the outside of the silicone rubber jacket, the two sealing plates rotate towards each other to abut against the sealing hardware, and in this state, the two locking blocks can be simultaneously inserted into the first locking grooves on the two sealing plates, and the elastic clip is inserted into the first locking groove.

[0019] By adopting the above technical solution, when the protective shell protects the lightning arrester, the two sealing plates are rotated toward each other in this state until they are in contact with the corresponding sealing fittings, and then the two locking blocks are simultaneously inserted into the first locking grooves on the two sealing plates, and the elastic clips are inserted into the first locking grooves, so that the two sealing plates are detachably locked.

[0020] Optionally, a second locking groove is provided on the outer surface of the lower half shell, and a second locking groove is provided on the inner wall of the second locking groove; when the two lower half shells are rotated away from the silicone rubber jacket until the outer sides abut against each other, the two locking blocks can be snapped into the second locking grooves, and the elastic clips are snapped into the corresponding second locking grooves.

[0021] By adopting the above technical solution, when the lightning arrester is installed and used, the two protective shells are rotated to a vertical state in the direction away from the silicone rubber jacket. At this time, the locking piece has been removed from the blocking plate, and the staff can insert the two locking blocks on the locking rod into the second locking groove, and the elastic clip into the corresponding second locking groove, thereby further locking the two protective shells in this state and improving the supporting stability of the protective shells on the lightning arrester.

[0022] Optionally, a waist-shaped fixing hole is provided on the blocking plate, and when the two lower half shells are rotated away from the silicone rubber jacket until the outer sides abut against each other, the two blocking plates can be rotated away from each other until they abut against the mounting surface.

[0023] By adopting the above technical solution, when the lightning arrester is installed and used, the two protective shells are rotated to a vertical state in the direction away from the silicone rubber jacket, and the two sealing plates are rotated away from each other to abut against the installation surface. The staff can use screws to pass through the waist-shaped fixing holes and screw them into the screw holes on the installation surface, thereby achieving the installation and fixation of the lightning arrester.

[0024] Optionally, a substation includes a box body, a box door arranged on the box body, and the above-mentioned zinc oxide lightning arrester, wherein a distribution room for installing the zinc oxide lightning arrester is provided in the box body.

[0025] By adopting the above technical solution, the zinc oxide lightning arrester is installed in the distribution room inside the box-type substation. During the operation of the power system, such as the closing and opening of the switch, operating overvoltage may be generated. The zinc oxide lightning arrester can absorb the overvoltage energy and protect the substation and the internal electrical equipment from damage.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: When the zinc oxide lightning arrester is installed vertically in a harsh outdoor environment, due to the application of the rain cap, the staff can use the protective cap to protect the upper end of the zinc oxide lightning arrester in advance. At this time, the inner wall of the rain cap is tightly pressed against the outer peripheral surface of the silicone rubber jacket to improve its waterproof and moisture-proof properties. The silicone material is aging-resistant for more than 20 years and has a long service life, reducing the possibility of external moisture penetrating into the interior from the joint between the silicone rubber jacket and the upper sealing hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 This is a schematic diagram of the structure of the rain cap installation distribution embodiment 1 of the present application; Figure 3 It is a schematic cross-sectional structure diagram of the installation and matching of the silicone rubber jacket and the sealing hardware in Example 1 of the present application; Figure 4 This is a schematic diagram of the overall structure of the protective shell and the silicone rubber jacket installed in Example 2 of the present application; Figure 5 This is a cross-sectional structural diagram of the installation and matching of the protective shell and the silicone rubber jacket in Example 2 of the present application; Figure 6 This is a schematic diagram of the explosion structure of the installation distribution of the upper half shell and the lower half shell in Example 2 of the present application; Figure 7 It is a partial cross-sectional structural schematic diagram of the installation and cooperation of the locking member embodied in the second embodiment of the present application; Figure 8 It is a partial cross-sectional structural schematic diagram of the installation and cooperation of the elastic clip fitting in the second embodiment of the present application; Fig. 9 This is a schematic diagram of the structure of Example 2 of the present application when the protective shell is rotated away from the silicone rubber jacket to a vertical state; Fig.10 is a schematic cross-sectional structural diagram of the installation and matching of the locking rod in Example 2 of the present application; Fig.11 It is a partial cross-sectional structural schematic diagram of the locking rod installation cooperation embodied in the second embodiment of the present application; Fig.12 It is a schematic diagram of the overall structure of the installation coordination of the box body and the box door according to Example 3 of the present application.

[0029] In the figure, 1, silicone rubber jacket; 11, umbrella skirt; 2, sealing hardware; 3, resistor valve plate; 4, insulating sleeve; 5, rain cap; 6, protective shell; 61, upper shell; 611, limit card slot; 612, adjusting screw hole; 613, guide convex strip; 62, lower shell; 621, adjusting plate; 6211, adjusting through hole; 6212, guide slide groove; 622, second locking groove; 623, second locking groove; 63, adjusting bolt; 64, limit piece; 641, elastic abutment ring; 65, blocking plate; 651, first locking groove; 652, first locking groove; 653, waist-shaped fixing hole; 7, locking piece; 71, locking rod; 72, locking block; 721, placement groove; 73, elastic clamping piece; 731, compression spring; 732, arc-shaped convex block; 8, box body; 9, box door. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0031] Embodiment 1: Reference Figure 1 , Figure 2 and Figure 3 A zinc oxide lightning arrester comprises a silicone rubber jacket 1 and sealing hardware 2 for sealing the openings at both ends of the silicone rubber jacket 1, a plurality of sheds 11 are integrally formed on the outer peripheral surface of the silicone rubber jacket 1 along its length direction, and a plurality of zinc oxide resistor valve sheets 3 are stacked inside the silicone rubber jacket 1 along its length direction; an insulating sleeve 4 is provided inside the silicone rubber jacket 1 and sleeved on the outside of the resistor valve sheet 3; The resistor valve plate 3 has good nonlinear volt-ampere characteristics, small size, good function, square wave greater than 200A, large current greater than 10KA, and good performance; and the zinc oxide lightning arrester can be combined with online monitoring equipment, and can be monitored online, specifically, its temperature change, leakage current, partial discharge, number of actions, etc.; A rainproof cap 5 made of silicone rubber is provided on the outer periphery of one end of the silicone rubber jacket 1; when the zinc oxide lightning arrester is installed in a harsh outdoor environment in a vertical direction, the protective cap 5 can be used to protect the upper end of the zinc oxide lightning arrester. At this time, the inner wall of the rainproof cap 5 is tightly pressed against the outer periphery of the silicone rubber jacket 1 to improve its waterproof and moisture-proof performance, and the silicone material is resistant to aging for more than 20 years.

[0032] The implementation principle of the embodiment of the present application is: When the zinc oxide lightning arrester is installed vertically in a harsh outdoor environment, a protective cap 5 can be used to protect the upper end of the zinc oxide lightning arrester to improve its waterproof and moisture-proof properties and reduce the possibility of external moisture penetrating into the interior from the connection between the silicone rubber jacket 1 and the upper end sealing fitting 2.

[0033] Embodiment 2: Reference Figure 4 and Figure 5 The difference between the embodiment of the present application and the embodiment 1 is that two protective shells 6 are symmetrically arranged outside the silicone rubber jacket 1, wherein the protective shell 6 is provided with a protective cavity for the silicone rubber jacket 1 to be placed, and a limiting member 64 for limiting and abutting the silicone rubber jacket 1 is arranged on the inner wall of the protective cavity, and the two protective shells 6 are detachably connected after being installed outside the silicone rubber jacket 1; When the arrester is transported, two protective shells 6 are installed on the outside of the silicone rubber jacket 1, and a limiter 64 is used to hold the wrapped silicone rubber jacket 1 tightly, so that the two protective shells 6 can better protect the outside of the silicone rubber jacket 1 and reduce the possibility of damage to the silicone rubber jacket 1 during transportation.

[0034] Reference Figure 5 and Figure 6 The overall length of the protective shell 6 is adjustable, wherein the protective shell 6 includes an upper half shell 61 and a lower half shell 62 arranged in a straight line, and an adjusting plate 621 located outside the upper half shell 61 is integrally formed on the side edge of the lower half shell 62 facing the upper half shell 61; a plurality of adjusting through holes 6211 are provided on the adjusting plate 621, and an adjusting screw hole 612 that can overlap with the adjusting through hole 6211 is provided on the upper half shell 61, and an adjusting bolt 63 that penetrates the adjusting through hole 6211 and is screwed into the adjusting screw hole 612 is provided on the outside of the silicone rubber jacket 1; when the upper half shell 61 and the lower half shell 62 are slidably adjusted to a certain state, the adjusting bolt 63 is penetrated through the adjusting through hole 6211 and is screwed into the adjusting screw hole 612, so that the overall length state of the protective shell 6 in this state can be fixed.

[0035] Reference Figure 5 and Figure 6 A guide ridge 613 is integrally formed on the outer surface of the upper half shell 61 along its length direction, and a guide groove 6212 is provided on the adjustment plate 621 for the guide ridge 613 to be inserted and slide. The cross-sectional shapes of the guide ridge 613 and the guide groove 6212 are both dovetail-shaped, thereby realizing a sliding connection between the adjustment plate 621 and the outer surface of the upper half shell 61.

[0036] Reference Figure 5 The limiting member 64 is a plurality of elastic abutting rings 641 fixedly arranged on the inner walls of the upper half shell 61 and the lower half shell 62, and the elastic abutting rings 641 are made of rubber. The inner walls of the upper half shell 61 and the lower half shell 62 are provided with limiting grooves 611 for the elastic abutting rings 641 to be embedded and further fixed by glue; when the protective shell 6 protects the outside of the silicone rubber jacket 1, the inner side surface of the elastic abutting ring 641 can be tightly pressed against the outer peripheral surface of the silicone rubber jacket 1.

[0037] Reference Figure 5 , Figure 7 and Figure 8The upper half shell 61 and the lower half shell 62 are both made of conductive materials and have good conductive properties, and will not affect the discharge performance of the arrester. The side edge of the lower half shell 62 away from the upper half shell 61 is hinged to the outer edge of the sealing hardware 2; a sealing plate 65 is hinged on the side edge of the upper half shell 61 away from the lower half shell 62, and a locking piece 7 for detachably locking the two sealing plates 65 is provided on the outside of the silicone rubber jacket 1; The locking member 7 includes a locking rod 71, a locking block 72 fixed on the outer periphery of both ends of the locking plate, and an elastic clamping member 73 is provided on the outer periphery of the locking block 72. A first locking groove 651 is provided on the blocking plate 65, and a first locking groove 652 for the elastic clamping member 73 to be clamped into is provided on the inner wall of the first locking groove 651. When the protective shell 6 protects the outside of the silicone rubber jacket 1, the two protective shells 6 are first rotated in the direction close to the silicone rubber jacket 1 to a state parallel to each other, and the two sealing plates 65 are rotated towards each other in this state to abut against the corresponding sealing hardware 2, and then the two locking blocks 72 are simultaneously inserted into the first locking grooves 651 on the two sealing plates 65, and the elastic clip 73 is inserted into the first locking groove 652, so that the two sealing plates 65 are detachably locked.

[0038] Reference Figure 7 and Figure 8 The elastic clamping member 73 includes a compression spring 731 and an arc-shaped protrusion 732, and a placement groove 721 is provided on the locking block 72 for the compression spring 731 and the arc-shaped protrusion 732 to be placed. The compression spring 731 presses one side of the arc-shaped protrusion 732 so that a part of the arc-shaped protrusion 732 protrudes out of the opening of the placement groove 721, and the protruding part of the arc-shaped protrusion 732 is an arc surface, and the arc length corresponding to the arc surface is a minor arc.

[0039] Reference Fig. 9 , waist-shaped fixing holes 653 are provided on the two blocking plates 65; the two lower half shells 62 can be rotated in the direction away from the silicone rubber jacket 1 until the outer side surfaces abut each other. In this state, the two protective shells 6 are in a parallel state to each other, and the two blocking plates 65 can be rotated away from each other until they abut against the mounting surface. In this state, the staff can use screws to penetrate the waist-shaped fixing holes 653 and screw them into the screw holes on the mounting surface to achieve the installation and fixation of the lightning arrester; and the staff can adjust the installation height of the lightning arrester by adjusting the overall length of the protective shell 6.

[0040] Reference Fig.10 and Fig.11A second locking groove 622 is provided on the outer surface of the lower half shell 62, and a second locking groove 623 is provided on the inner wall of the second locking groove 622; when the two lower half shells 62 can be rotated in the direction away from the silicone rubber jacket 1 until the outer sides abut against each other, at this time, the locking piece 7 has been removed from the blocking plate 65, and the staff can snap the two locking blocks 72 on the locking rod 71 into the second locking groove 622, and the elastic clip 73 into the corresponding second locking groove 623, further locking the two protective shells 6 in this state.

[0041] The implementation principle of the embodiment of the present application is: When transporting the arrester, the two protective shells 6 are rotated toward the direction close to the silicone rubber jacket 1 until they are parallel to each other, the inner side of the elastic abutment ring 641 is pressed against the outer peripheral surface of the silicone rubber jacket 1, and then the two blocking plates 65 are rotated downward and locked using the locking member 7; When installing the lightning arrester, first release the lock of the locking piece 7 on the sealing plate 65, then adjust the overall degree of the protective shell 6 according to actual needs, then rotate the two protective shells 6 away from the silicone rubber jacket 1 to a state of mutual parallelism, and use the lock to lock the two mutually abutting lower half shells 62; finally, rotate the two sealing plates 65 away from each other to abut the installation surface. In this state, screws can be used to penetrate the waist-shaped fixing holes 653 and screwed into the screw holes on the installation surface to achieve the installation and fixation of the lightning arrester.

[0042] Embodiment 3: Reference Fig.12 , a substation, comprising a box body 8, a box door 9 arranged on the box body 8 and the above-mentioned zinc oxide lightning arrester, one side of the box door 9 is hinged to the box body 8, and the other side of the box door 9 is detachably connected to the box body 8 through a conventional lock structure, and a distribution room for installing the zinc oxide lightning arrester is provided in the box body 8; The zinc oxide lightning arrester is installed in the distribution room inside the box-type substation. During the operation of the power system, such as the closing and opening of the switch, operating overvoltage may be generated. The zinc oxide lightning arrester can absorb this overvoltage energy and protect the substation and the internal electrical equipment from damage.

[0043] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A zinc oxide lightning arrester, comprising a silicone rubber jacket (1), a plurality of sheds (11) fixedly arranged on the outer peripheral surface of the silicone rubber jacket (1), and a sealing hardware (2) for sealing the openings at both ends of the silicone rubber jacket (1), wherein a plurality of resistor valve plates (3) are arranged inside the silicone rubber jacket (1), and an insulating sleeve (4) is arranged inside the silicone rubber jacket (1) and is sleeved on the outside of the resistor valve plates (3); It is characterized in that A rainproof cap (5) made of silicone rubber is sleeved on the outer periphery of one end of the silicone rubber jacket (1), and the inner wall of the rainproof cap (5) is tightly pressed against the outer periphery of the silicone rubber jacket (1).

2. A zinc oxide lightning arrester according to claim 1, characterized in that: Two protective shells (6) are symmetrically arranged outside the silicone rubber jacket (1); a protective cavity is provided on the protective shell (6) for the silicone rubber jacket (1) to be placed therein; a limiting piece (64) is provided on the inner wall of the protective cavity for abutting against the outer periphery of the silicone rubber jacket (1); and the two protective shells (6) are detachably connected after being installed outside the silicone rubber jacket (1).

3. A zinc oxide arrester according to claim 2, characterized in that: The overall length of the protective shell (6) is adjustable. The protective shell (6) comprises an upper half shell (61) and a lower half shell (62). An adjustment plate (621) located outside the upper half shell (61) is fixedly provided on the side edge of the lower half shell (62) facing the upper half shell (61). The adjustment plate (621) is slidably connected to the outer side surface of the upper half shell (61). The adjusting plate (621) is provided with a plurality of adjusting through holes (6211), the upper half shell (61) is provided with adjusting screw holes (612) that can overlap with the adjusting through holes (6211), and the outside of the silicone rubber jacket (1) is provided with adjusting bolts (63) that penetrate through the adjusting through holes (6211) and are screwed into the adjusting screw holes (612).

4. A zinc oxide arrester according to claim 3, characterized in that: A guide ridge (613) is fixedly provided on the outer surface of the upper half shell (61), and a guide groove (6212) is provided on the adjustment plate (621) for the guide ridge (613) to be inserted and slide. The cross-sectional shapes of the guide ridge (613) and the guide groove (6212) are both dovetail-shaped.

5. A zinc oxide arrester according to claim 3, characterized in that: The limiting components (64) are a plurality of elastic abutment rings (641) fixedly mounted on the inner walls of the upper half shell (61) and the lower half shell (62). The inner walls of the upper half shell (61) and the lower half shell (62) are provided with limiting grooves (611) for the elastic abutment rings (641) to be embedded and fixed. The inner side surfaces of the elastic abutment rings (641) can be tightly abutted against the outer peripheral surface of the silicone rubber jacket (1).

6. A zinc oxide arrester according to claim 3, characterized in that: The upper half shell (61) and the lower half shell (62) are both made of conductive materials, and the side edge of the lower half shell (62) away from the upper half shell (61) is hinged to the outer peripheral edge of the sealing hardware (2); The two lower half shells (62) can be rotated in a direction away from the silicone rubber jacket (1) until the outer sides thereof abut against each other, and the ends of the two upper half shells (61) away from the lower half shells (62) can be fixed on the mounting surface in this state.

7. A zinc oxide arrester according to claim 6, characterized in that: A sealing plate (65) is hingedly connected to the side edge of the upper half shell (61) away from the lower half shell (62), and a locking rod (71) is provided on the outside of the silicone rubber jacket (1); Locking blocks (72) are fixedly provided on the outer peripheries of both ends of the locking plate, and elastic clamping members (73) are provided on the outer peripheries of the locking blocks (72). A first locking groove (651) is provided on the blocking plate (65), and a first locking groove (652) for the elastic clamping member (73) to be clamped into is provided on the inner wall of the first locking groove (651); When the protective shell (6) protects the outside of the silicone rubber jacket (1), the two sealing plates (65) rotate towards each other until they are in contact with the sealing hardware (2). In this state, the two locking blocks (72) can be simultaneously inserted into the first locking grooves (651) on the two sealing plates (65), and the elastic clamping piece (73) is inserted into the first locking groove (652).

8. A zinc oxide lightning arrester according to claim 7, characterized in that: A second locking groove (622) is provided on the outer surface of the lower half shell (62), and a second locking groove (623) is provided on the inner wall of the second locking groove (622); when the two lower half shells (62) are rotated in a direction away from the silicone rubber jacket (1) until the outer sides abut against each other, the two locking blocks (72) can be snapped into the second locking grooves (622), and the elastic snap-fitting parts (73) can be snapped into the corresponding second locking grooves (623).

9. A zinc oxide lightning arrester according to claim 7, characterized in that: The sealing plate (65) is provided with a waist-shaped fixing hole (653), and when the two lower half shells (62) are rotated in a direction away from the silicone rubber jacket (1) until the outer side surfaces abut against each other, the two sealing plates (65) can be rotated away from each other until they abut against the mounting surface.

10. A substation, characterized in that: It comprises a box body (8), a box door (9) arranged on the box body (8), and a zinc oxide lightning arrester as claimed in any one of claims 1 to 9, wherein a distribution room for installing the zinc oxide lightning arrester is arranged in the box body (8).

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