Lightning arrester and gas insulated switchgear

Abstract

The invention provides a lightning arrester and a gas insulated switchgear, and relates to the technical field of lightning arresters. In the lightning arrester, at least part of a solid insulating part is arranged in a shell, a voltage limiting part is arranged in the solid insulating part and between a high-voltage end conductive part and a low-voltage end conductive part, and the high-voltage end conductive part and the low-voltage end conductive part both penetrate through the solid insulating part and are electrically connected with the voltage limiting part. The solid insulating part is used for wrapping the voltage limiting part to serve as an insulating medium of the lightning arrester, so that SF6 gas does not need to be filled into the shell for insulation, and the environmental protection of the lightning arrester is realized; and meanwhile, the SF6 gas does not need to be filled, so that the use of matched parts such as a gas valve and a gas monitor can be saved, the miniaturization design of the lightning arrester is facilitated, and the part cost, the assembly cost and the operation and maintenance cost of the lightning arrester can be reduced.

Description

Technical Field

[0001] This application relates to the field of surge arrester technology, and more particularly to a surge arrester and a gas-insulated switchgear. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] In gas-insulated switchgear (GIS), metal oxide surge arresters (MOAs) typically use SF6 gas as the insulating medium. However, SF6 gas is a high greenhouse gas with a high greenhouse potential and a long residence time in the atmosphere; leakage would have a significant impact on the environment. Therefore, achieving green and environmentally friendly surge arresters has become an urgent technical problem to be solved in this field. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a surge arrester and a gas-insulated switchgear, which aims to solve the technical problem of how to achieve green and environmentally friendly surge arresters.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a surge arrester, comprising: a housing; and surge arrester phase elements, including a solid insulating component, a high-voltage end conductive component, a low-voltage end conductive component, and a voltage limiting component. At least a portion of the solid insulating component is disposed within the housing, the voltage limiting component is disposed between the high-voltage end conductive component and the low-voltage end conductive component, the voltage limiting component is disposed within the solid insulating component, both the high-voltage end conductive component and the low-voltage end conductive component are electrically connected to the voltage limiting component, and both the high-voltage end conductive component and the low-voltage end conductive component pass through the solid insulating component.

[0006] In some embodiments of the first aspect, the solid insulating element includes a first insulator and a second insulator, the first insulator passing through the housing, a portion of the first insulator being disposed within the housing, the voltage limiting element being disposed within the first insulator, the high-voltage end conductive element and the low-voltage end conductive element both passing through the first insulator, the second insulator and the high-voltage end conductive element being located at the same end of the first insulator, the second insulator being disposed within the housing, and the second insulator being connected to both the first insulator and the housing.

[0007] In some embodiments of the first aspect, the first insulator and the second insulator are integrally molded using a first insulating material.

[0008] In some embodiments of the first aspect, the first insulating material is one of epoxy resin, polyurethane, silicone, and polyester.

[0009] In some embodiments of the first aspect, the housing includes an outer shell and a first flange connected to one end of the outer shell, a low-voltage conductive element passing through the outer shell at the end away from the first flange, the low-voltage conductive element being insulated from the outer shell, a first insulator passing through the first flange, a portion of the first insulator being disposed within the outer shell, and a second insulator being disposed within the outer shell and connected to the first flange.

[0010] In some embodiments of the first aspect, the surge arrester further includes a second flange and a plurality of first fasteners, the second insulator is disposed around the first insulator, the second flange is disposed inside the housing, the second insulator is disposed between the first flange and the second flange, the plurality of first fasteners are arranged at circumferential intervals along the second flange, each first fastener is respectively inserted through the second flange, the second insulator and the first flange, and each first fastener is respectively connected to the second flange and the first flange.

[0011] In some embodiments of the first aspect, the surge arrester further includes a first seal disposed between the second insulator and the first flange, the first seal being arranged around the first insulator.

[0012] In some embodiments of the first aspect, the housing further includes a third flange and a plurality of second fasteners, the third flange being disposed between the housing and the first flange and sealed to the housing, the plurality of second fasteners being arranged circumferentially spaced along the third flange, each second fastener passing through the third flange and the first flange respectively, and each second fastener being connected to the third flange and the first flange respectively.

[0013] In some embodiments of the first aspect, the housing further includes a second seal disposed between the first flange and the third flange, the second seal surrounding the second insulator.

[0014] In some embodiments of the first aspect, the pressure limiting member includes a plurality of pressure limiting modules, which are arranged between the high-voltage end conductor and the low-voltage end conductor. Adjacent pressure limiting modules are electrically connected to each other. The high-voltage end conductor is electrically connected to a pressure limiting module located away from the low-voltage end conductor, and the low-voltage end conductor is electrically connected to a pressure limiting module located away from the high-voltage end conductor.

[0015] In some embodiments of the first aspect, each voltage limiting module includes a first electrode, a second electrode, and a plurality of resistive elements. The plurality of resistive elements are arranged between the first electrode and the second electrode, and adjacent resistive elements are electrically connected to each other. The first electrode is electrically connected to a resistive element located away from the second electrode, and the second electrode is electrically connected to a resistive element located away from the first electrode. The high-voltage end conductor is electrically connected to the first electrode of a voltage limiting module located away from the low-voltage end conductor, and the low-voltage end conductor is electrically connected to the second electrode of a voltage limiting module located away from the high-voltage end conductor. In two adjacent voltage limiting modules, the second electrode of one voltage limiting module is electrically connected to the first electrode of the other voltage limiting module.

[0016] In some embodiments of the first aspect, each of the voltage limiting modules further includes an insulating encapsulation structure, in which a plurality of the resistors are disposed, and the insulating encapsulation structure is respectively sealed to the first electrode and the second electrode.

[0017] In some embodiments of the first aspect, the insulating encapsulation structure includes a main body, a first protrusion, and a second protrusion. A plurality of the resistors are disposed within the main body. The first electrode and the second electrode both pass through the main body. A first recess is provided on the outer periphery of the first electrode. The first protrusion is connected to the main body and embedded in the first recess. A second recess is provided on the outer periphery of the second electrode. The second protrusion is connected to the main body and embedded in the second recess.

[0018] In some embodiments of the first aspect, the main body, the first protrusion, and the second protrusion are integrally molded using a second insulating material.

[0019] In some embodiments of the first aspect, the second insulating material is one of modified nylon, epoxy resin, polyurethane, silicone, and polyester.

[0020] In some embodiments of the first aspect, the pressure limiting member further includes at least one conductive screw, one conductive screw corresponding to two pressure limiting modules, and in two adjacent pressure limiting modules, the conductive screw is threadedly connected to the second electrode and the first electrode, respectively.

[0021] In some embodiments of the first aspect, the pressure limiting element includes a pressure limiting module, and both the high-voltage end conductor and the low-voltage end conductor are electrically connected to the pressure limiting module.

[0022] In some embodiments of the first aspect, the number of surge arrester phase elements is multiple, and the multiple surge arrester phase elements are arranged at circumferential intervals along the housing; or, the number of surge arrester phase elements is one, and the surge arrester phase element is coaxially arranged with the housing.

[0023] In some embodiments of the first aspect, the surge arrester further includes a shielding base, a spring contact finger, and a third fastener. One end of the shielding base is provided with a first mating hole, and the other end of the shielding base away from the first mating hole is provided with a second mating hole. The shielding base is also provided with a through hole and an annular groove. The through hole communicates with the first mating hole and the second mating hole, respectively. The high-voltage end conductive element passes through the first mating hole. The third fastener passes through the through hole and is connected to the shielding base and the high-voltage end conductive element, respectively. The annular groove communicates with the second mating hole, and the spring contact finger is disposed in the annular groove.

[0024] Secondly, embodiments of this application provide a gas-insulated switchgear, including a busbar conduit, a busbar, and a surge arrester as described in any of the embodiments of the first aspect above. The busbar conduit is connected to the housing, the busbar is disposed inside the busbar conduit and electrically connected to the high-voltage end conductive element, and both the busbar conduit and the low-voltage end conductive element are grounded.

[0025] The beneficial effects of this application are as follows: In the surge arrester provided in this application, at least a portion of the solid insulating component is disposed within the housing. A voltage-limiting component is disposed within the solid insulating component and between the high-voltage and low-voltage conductive components. Both the high-voltage and low-voltage conductive components pass through the solid insulating component and are electrically connected to the voltage-limiting component. Because the voltage-limiting component is encased in the solid insulating component as the insulating medium of the surge arrester, there is no need to fill the housing with SF6 gas for insulation, thus achieving a green and environmentally friendly surge arrester. Furthermore, since there is no need to fill with SF6 gas, the use of gas valves, gas monitors, and other supporting components can be eliminated. This not only facilitates the miniaturization of the surge arrester but also helps reduce the cost of components, assembly, and operation and maintenance.

[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This application shows a schematic diagram of the surge arrester from one perspective in some embodiments; Figure 2 This application shows a schematic diagram of the surge arrester from another perspective in some embodiments; Figure 3 This application shows another perspective structural schematic diagram of the surge arrester in some embodiments; Figure 4 It shows Figure 3 Schematic diagram of the cross-sectional structure at point AA; Figure 5 It shows Figure 4 A magnified structural diagram of region B in the middle; Figure 6 It shows Figure 4 A magnified structural diagram of region C in the middle; Figure 7 It shows Figure 1 A schematic diagram of the middle shell from one perspective; Figure 8 It shows Figure 1 Another structural diagram of the middle shell; Figure 9 It shows Figure 1 A schematic diagram of the phase element of a surge arrester from one perspective; Figure 10 It shows Figure 1 Exploded view of the structure of a surge arrester; Figure 11 It shows Figure 1 Another perspective structural schematic diagram of the phase element of the surge arrester; Figure 12 It shows Figure 11 Schematic diagram of the cross-sectional structure at point DD; Figure 13 It shows Figure 12 A magnified structural diagram of region E in the middle; Figure 14 It shows Figure 12A magnified structural diagram of region F in the middle; Figure 15 A schematic diagram of the surge arrester from one perspective is shown in some other embodiments of this application; Figure 16 This application shows a schematic diagram of the surge arrester from another perspective in some other embodiments; Figure 17 It shows Figure 15 A schematic diagram of the phase element of a surge arrester from one perspective; Figure 18 It shows Figure 17 A schematic diagram of the cross-sectional structure at point GG.

[0029] Explanation of key component symbols: 1000 - Surge arrester; 100 - Housing; 110 - Outer shell; 111 - Second clearance hole; 120 - First flange; 121 - First clearance hole; 122 - First connection hole; 123 - Fifth connection hole; 130 - Third flange; 131 - Fourth connection hole; 140 - Second fastener; 150 - Second seal; 200 - Surge arrester phase element; 210 - Solid insulator; 211 - First insulator; 212 - Second insulator; 2121 - Third connection hole; 220 - High-voltage side conductor; 230 - Low-voltage side conductor; 240 - Voltage limiting element; 241 - Voltage limiting module; 2411 - First electrode; 24111 - First... 24112-First screw hole; 2412-Second electrode; 24121-Second recess; 24122-Second screw hole; 2413-Resistor piece; 2414-Insulating encapsulation structure; 24141-Main body; 24142-First protrusion; 24143-Second protrusion; 242-Conductive screw; 300-Second flange; 310-Second connecting hole; 400-First fastener; 500-First seal; 600-Shielding seat; 610-First mating hole; 620-Second mating hole; 630-Through hole; 640-Annular groove; 700-Spring contact finger; 800-Third fastener; 900-Insulating support. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0034] In the description of this application, unless otherwise explicitly specified, the term "connection" should be interpreted broadly. For example, it can refer to a non-detachable connection, a detachable connection, or a single-piece structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0036] In gas-insulated switchgear (GIS), metal oxide surge arresters (MOAs) typically use SF6 gas as the insulating medium. However, SF6 gas is a high greenhouse gas with a high greenhouse potential and a long residence time in the atmosphere; leakage would have a significant impact on the environment. Therefore, achieving green and environmentally friendly surge arresters has become an urgent technical problem to be solved in this field.

[0037] Meanwhile, due to the use of SF6 gas, gas valves, gas monitors, and other components are typically required, which can easily increase the component costs, assembly costs, and operation and maintenance costs of the surge arrester. Furthermore, to provide mechanical support and insulation, surge arresters usually integrate basin-type insulators; however, configuring and assembling basin-type insulators also easily increases the component costs, assembly costs, and operation and maintenance costs of the surge arrester.

[0038] like Figure 1 As shown, in order to solve the above-mentioned technical problems, the embodiments of this application provide a surge arrester 1000, which belongs to the field of surge arrester technology. The surge arrester 1000 can be used as a component of gas-insulated switchgear, that is, the gas-insulated switchgear includes the surge arrester 1000; of course, the surge arrester 1000 can also be used independently of the gas-insulated switchgear, or in conjunction with the gas-insulated switchgear. The application scenarios of the surge arrester 1000 are not specifically limited here.

[0039] like Figures 1 to 4 As shown, the surge arrester 1000 provided in this embodiment includes a housing 100 and a surge arrester phase element 200. The surge arrester phase element 200 includes a solid insulating component 210, a high-voltage end conductive component 220, a low-voltage end conductive component 230, and a voltage limiting component 240. At least a portion of the solid insulating component 210 is disposed within the housing 100. The voltage limiting component 240 is disposed between the high-voltage end conductive component 220 and the low-voltage end conductive component 230. The voltage limiting component 240 is disposed within the solid insulating component 210. Both the high-voltage end conductive component 220 and the low-voltage end conductive component 230 are electrically connected to the voltage limiting component 240. Both the high-voltage end conductive component 220 and the low-voltage end conductive component 230 pass through the solid insulating component 210.

[0040] It is understood that in the surge arrester 1000 provided in this embodiment, at least a portion of the solid insulating member 210 is disposed within the housing 100, and the voltage limiting member 240 is disposed within the solid insulating member 210 and between the high-voltage end conductive member 220 and the low-voltage end conductive member 230. Both the high-voltage end conductive member 220 and the low-voltage end conductive member 230 pass through the solid insulating member 210 and are electrically connected to the voltage limiting member 240.

[0041] Since the solid insulating component 210 is used to wrap the voltage limiting component 240 as the insulating medium of the surge arrester 1000, there is no need to fill the housing 100 with SF6 gas for insulation, thus achieving the green and environmentally friendly nature of the surge arrester 1000.

[0042] At the same time, since there is no need to fill with SF6 gas, the use of supporting components such as gas valves and gas monitors can be eliminated. This not only facilitates the miniaturization design of the surge arrester 1000, but also helps to reduce the component costs, assembly costs and operation and maintenance costs of the surge arrester 1000.

[0043] For example, the material of the high-voltage end conductive component 220 can be copper, copper alloy, etc., and its surface can be provided with a silver plating layer or a tin plating layer. The material of the low-voltage end conductive component 230 can be copper, copper alloy, stainless steel, etc., without specific limitations.

[0044] like Figure 3 , Figure 4 as well as Figures 11 to 13 As shown, in some embodiments, the solid insulating member 210 includes a first insulator 211 and a second insulator 212. The first insulator 211 passes through the housing 100, a portion of the first insulator 211 is disposed within the housing 100, a voltage limiting member 240 is disposed within the first insulator 211, a high-voltage end conductive member 220 and a low-voltage end conductive member 230 both pass through the first insulator 211, the second insulator 212 and the high-voltage end conductive member 220 are located at the same end of the first insulator 211, the second insulator 212 is disposed within the housing 100, and the second insulator 212 is connected to the first insulator 211 and the housing 100 respectively.

[0045] It is understood that the first insulator 211 can provide insulation between the pressure limiting member 240 and the housing 100, and the portion of the first insulator 211 that passes through the housing 100 and the second insulator 212 can jointly provide mechanical support and insulation for the high-voltage conductive member 220.

[0046] like Figures 11 to 13 As shown, the first insulator 211 and the second insulator 212 are further integrally molded using the first insulating material.

[0047] It is understandable that since the first insulator 211 and the second insulator 212 are integrally cast, and since the first insulator 211 provides insulation between the voltage limiting component 240 and the housing 100, and since the part of the first insulator 211 that passes through the housing 100 and the second insulator 212 together provide mechanical support and insulation for the high-voltage end conductive component 220, the aforementioned solid insulator 210 serves as both the insulating medium inside the surge arrester 1000 and the basin-type insulator. This eliminates the need for additional configuration and assembly of basin-type insulators, thereby helping to reduce the component costs and assembly costs of the surge arrester 1000.

[0048] For example, the first insulating material is one or a combination of several of epoxy resin, polyurethane, organosilicon (e.g., silicone rubber, silicone resin, etc.) and polyester, without any specific limitation herein.

[0049] It should be noted that the first insulator 211 and the second insulator 212 are preferably made by epoxy resin casting in one piece. Since the solid insulating part 210 formed after the epoxy resin is cured has both high insulation performance and high load-bearing capacity, and has small molding shrinkage, it helps to improve structural stability and reliability.

[0050] like Figures 2 to 4 as well as Figure 11 and Figure 12 As shown, the housing 100 further includes an outer shell 110 and a first flange 120. The first flange 120 is connected to one end of the outer shell 110. A low-voltage conductive element 230 is disposed at the end of the outer shell 110 away from the first flange 120. The low-voltage conductive element 230 is insulated from the outer shell 110. A first insulator 211 is disposed through the first flange 120. A portion of the first insulator 211 is disposed inside the outer shell 110. A second insulator 212 is disposed inside the outer shell 110 and connected to the first flange 120.

[0051] Thus, when assembling the surge arrester 1000, the first insulator 211 is first inserted into the first flange 120, and the second insulator 212 is connected and fixed to the first flange 120. Then, the first flange 120 is connected and fixed to the busbar of the gas-insulated switchgear, thereby assembling the surge arrester 1000 into the gas-insulated switchgear. In this process, there is no need for additional configuration and assembly of pot-type insulators, which helps reduce the component costs, assembly costs, and operation and maintenance costs of the surge arrester 1000.

[0052] like Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, by way of example, the first flange 120 is provided with a first clearance hole 121, the first insulator 211 passes through the first clearance hole 121, the outer shell 110 is provided with a second clearance hole 111, and the low-voltage end conductive element 230 passes through the second clearance hole 111.

[0053] like Figure 3 and Figure 4 As shown, by way of example, the surge arrester 1000 also includes an insulating support 900, which is disposed between the low-voltage end conductor 230 and the housing 110, so that the low-voltage end conductor 230 is insulated from the housing 110 and can support the low-voltage end conductor 230.

[0054] For example, the materials of the insulating support 900 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (such as polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubber (such as silicone rubber, nitrile rubber, etc.), synthetic fibers (such as polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations.

[0055] like Figures 2 to 5 as well as Figures 11 to 13 As shown, the surge arrester 1000 further includes a second flange 300 and a plurality of first fasteners 400. A second insulator 212 is arranged around a first insulator 211. The second flange 300 is disposed inside the housing 110. The second insulator 212 is disposed between the first flange 120 and the second flange 300. The plurality of first fasteners 400 are arranged at intervals along the circumference of the second flange 300. Each first fastener 400 passes through the second flange 300, the second insulator 212 and the first flange 120 respectively. Each first fastener 400 is connected to the second flange 300 and the first flange 120 respectively.

[0056] It is understandable that by having the first fastener 400 pass through the second flange 300, the second insulator 212 and the first flange 120 respectively, and connected to the second flange 300 and the first flange 120 respectively, the surge arrester phase element 200 can be reliably fixed to the first flange 120, thereby improving the structural stability and operational reliability of the surge arrester 1000.

[0057] Furthermore, by arranging multiple first fasteners 400 at intervals along the circumference of the second flange 300, the forces on the second flange 300, the second insulator 212, and the first flange 120 can be more evenly distributed, thereby further improving the structural stability and operational reliability of the surge arrester 1000.

[0058] like Figures 3 to 5 As shown, by way of example, the first flange 120 is provided with a first connection hole 122, the second flange 300 is provided with a second connection hole 310, the second insulator 212 is provided with a third connection hole 2121, and the first fastener 400 is respectively provided through the second connection hole 310, the third connection hole 2121 and the first connection hole 122.

[0059] like Figures 3 to 5 as well as Figure 11 As shown, the surge arrester 1000 further includes a first seal 500, which is disposed between the second insulator 212 and the first flange 120, and surrounds the first insulator 211.

[0060] It is understood that by providing the first seal 500 between the second insulator 212 and the first flange 120 and surrounding the first insulator 211, a sealed connection between the second insulator 212 and the first flange 120 can be achieved, which helps to create a dry environment within the housing 110 to improve the insulation reliability of the surge arrester 1000.

[0061] like Figures 3 to 5 As shown, the housing 100 further includes a third flange 130 and a plurality of second fasteners 140. The third flange 130 is disposed between the housing 110 and the first flange 120 and is sealed to the housing 110. The plurality of second fasteners 140 are arranged at intervals along the circumference of the third flange 130. Each second fastener 140 passes through the third flange 130 and the first flange 120 respectively and is connected to the third flange 130 and the first flange 120 respectively.

[0062] It is understandable that by using the second fastener 140 to pass through the third flange 130 and the first flange 120 respectively, and connecting to the third flange 130 and the first flange 120 respectively, the housing 110 can be reliably fixed to the first flange 120, thereby improving the structural stability and operational reliability of the surge arrester 1000.

[0063] Furthermore, by arranging multiple second fasteners 140 at circumferential intervals along the third flange 130, the forces on the first flange 120 and the third flange 130 can be more evenly distributed, thereby further improving the structural stability and operational reliability of the surge arrester 1000.

[0064] For example, the third flange 130 can be welded to the housing 110 for sealing, or the third flange 130 and the housing 110 can be integrally formed from metal materials, both of which can achieve a sealed connection between the third flange 130 and the housing 110. No specific limitation is made here.

[0065] For example, the materials of the housing 110, the first flange 120, the second flange 300, and the third flange 130 may be stainless steel, carbon steel, aluminum alloy, or other metal materials with sufficient mechanical strength and corrosion resistance, without specific limitations.

[0066] like Figures 3 to 5 As shown, by way of example, the third flange 130 is provided with a fourth connection hole 131, the first flange 120 is provided with a fifth connection hole 123, and the second fastener 140 is respectively inserted into the fourth connection hole 131 and the fifth connection hole 123.

[0067] like Figures 2 to 5 As shown, the housing 100 further includes a second seal 150, which is disposed between the first flange 120 and the third flange 130 and surrounds the second insulator 212.

[0068] Understandably, by having the second seal 150 disposed between the first flange 120 and the third flange 130 and surrounding the second insulator 212, a sealed connection between the first flange 120 and the third flange 130 can be achieved, which helps to create a dry environment within the housing 110 to improve the insulation reliability of the surge arrester 1000.

[0069] For example, the materials of the first seal 500 and the second seal 150 can be nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, polytetrafluoroethylene, polyurethane, natural rubber, etc., without specific limitations.

[0070] like Figure 3 , Figure 4 as well as Figure 9 and Figure 10 As shown, in some embodiments, the pressure limiting component 240 includes a plurality of pressure limiting modules 241, which are arranged between the high-voltage end conductor 220 and the low-voltage end conductor 230. Adjacent pressure limiting modules 241 are electrically connected to each other. The high-voltage end conductor 220 is electrically connected to a pressure limiting module 241 that is away from the low-voltage end conductor 230, and the low-voltage end conductor 230 is electrically connected to a pressure limiting module 241 that is away from the high-voltage end conductor 220.

[0071] It is understandable that when manufacturing the voltage limiting component 240, multiple voltage limiting modules 241 are first manufactured separately, and then the multiple voltage limiting modules 241 are assembled to form the voltage limiting component 240. This helps to reduce the process complexity of the surge arrester phase element 200, thereby reducing the manufacturing difficulty of the surge arrester phase element 200.

[0072] For example, multiple voltage limiting modules 241 may be used, such as two voltage limiting modules 241, three voltage limiting modules 241, four voltage limiting modules 241, five voltage limiting modules 241, six voltage limiting modules 241, seven or more voltage limiting modules 241, etc., without specific limitations here.

[0073] like Figure 3 , Figure 4 , Figure 11 and Figure 12 As shown, each voltage limiting module 241 further includes a first electrode 2411, a second electrode 2412, and a plurality of resistors 2413. The plurality of resistors 2413 are arranged between the first electrode 2411 and the second electrode 2412. Adjacent resistors 2413 are electrically connected to each other. The first electrode 2411 is electrically connected to a resistor 2413 that is away from the second electrode 2412. The second electrode 2412 is electrically connected to a resistor 2413 that is away from the first electrode 2411. The high-voltage end conductor 220 is electrically connected to the first electrode 2411 of a voltage limiting module 241 that is away from the low-voltage end conductor 230. The low-voltage end conductor 230 is electrically connected to the second electrode 2412 of a voltage limiting module 241 that is away from the high-voltage end conductor 220. In two adjacent voltage limiting modules 241, the second electrode 2412 of one voltage limiting module 241 is electrically connected to the first electrode 2411 of the other voltage limiting module 241.

[0074] It is understood that when using the surge arrester 1000 provided in this embodiment, the high-voltage end conductive element 220 is electrically connected to the busbar of the gas-insulated switchgear, the low-voltage end conductive element 230 is grounded, and the surge arrester 1000 achieves overvoltage protection function through the surge arrester phase element 200.

[0075] Specifically, under normal operating voltage, the resistor 2413 is in a high-resistance state, making the high-voltage end conductor 220 and the low-voltage end conductor 230 essentially non-conductive; when an overvoltage occurs on the bus, the resistor 2413 quickly changes from a high-resistance state to a low-resistance state, so that the overvoltage forms a discharge path through the high-voltage end conductor 220, the resistor 2413 and the low-voltage end conductor 230, thereby limiting the overvoltage within a safe range and dissipating the energy to the ground; when the overvoltage disappears, the resistor 2413 returns to a high-resistance state.

[0076] It should be noted that the resistor 2413 refers to a metal oxide valve plate, which has nonlinear current-voltage characteristics. It is preferably a zinc oxide valve plate (ZnO), but it can also be a silicon carbide valve plate (SiC). No specific limitation is made here.

[0077] For example, the material of the first electrode 2411 / the material of the second electrode 2412 is preferably aluminum or aluminum alloy, but it can also be copper, copper alloy or stainless steel, without specific limitation.

[0078] Furthermore, a conductive plating layer may be provided on the surface of the first electrode 2411 / the surface of the second electrode 2412 to reduce contact resistance and improve corrosion resistance. For example, the material of the conductive plating layer may be silver, nickel, tin, copper, gold, etc., and no specific limitation is made herein.

[0079] like Figures 10 to 12 As shown, each voltage limiting module 241 further includes an insulating encapsulation structure 2414, with multiple resistors 2413 disposed within the insulating encapsulation structure 2414. The insulating encapsulation structure 2414 is sealed and connected to the first electrode 2411 and the second electrode 2412 respectively.

[0080] Understandably, by setting up the insulating encapsulation structure 2414, on the one hand, the resistor piece 2413 can be encapsulated to reduce the risk of moisture penetration, thereby providing a dry environment for the resistor piece 2413; on the other hand, the insulation strength can be further increased on the basis of the solid insulating component 210 to improve the insulation reliability of the surge arrester 1000; and on the other hand, it can provide mechanical strength so that the first electrode 2411, multiple resistor pieces 2413 and the second electrode 2412 form a stable overall structure to improve the structural stability and operational reliability of the surge arrester 1000.

[0081] like Figures 11 to 14 As shown, the insulating encapsulation structure 2414 further includes a main body 24141, a first protrusion 24142, and a second protrusion 24143. A plurality of resistor sheets 2413 are disposed within the main body 24141. The first electrode 2411 and the second electrode 2412 both pass through the main body 24141. The outer periphery of the first electrode 2411 is provided with a first recess 24111. The first protrusion 24142 is connected to the main body 24141 and embedded in the first recess 24111. The outer periphery of the second electrode 2412 is provided with a second recess 24121. The second protrusion 24143 is connected to the main body 24141 and embedded in the second recess 24121.

[0082] It is understandable that by embedding the first protrusion 24142 into the first recess 24111 and the second protrusion 24143 into the second recess 24121, the bonding strength between the insulating encapsulation structure 2414 and the first electrode 2411 and the second electrode 2412 can be enhanced. This not only helps to further improve the structural stability and reliability of the surge arrester 1000, but also helps to improve the reliability of the sealed connection between the insulating encapsulation structure 2414 and the first electrode 2411 and the second electrode 2412, so as to further reduce the risk of moisture penetration.

[0083] like Figures 11 to 14As shown, the main body 24141, the first protrusion 24142 and the second protrusion 24143 are integrally molded using a second insulating material, which facilitates the standardized production and manufacturing of the surge arrester phase element 200.

[0084] Specifically, when manufacturing the surge arrester phase element 200, the high-voltage end conductive element 220 is connected to the first electrode 2411, and the low-voltage end conductive element 230 is connected to the second electrode 2412. Multiple resistor pieces 2413 are pressed together by the first electrode 2411 and the second electrode 2412. Then, a second insulating material is poured and cured to form an insulating encapsulation structure 2414, so as to fix and encapsulate the first electrode 2411, the second electrode 2412 and the multiple resistor pieces 2413 through the insulating encapsulation structure 2414. Then, the first insulating material is poured and cured to form a solid insulating element 210, thereby obtaining the surge arrester phase element 200.

[0085] For example, the second insulating material is one or a combination of several of the following: modified nylon, epoxy resin, polyurethane, silicone (e.g., silicone rubber, silicone resin, etc.), and polyester, without specific limitations. Preferably, the main body 24141, the first protrusion 24142, and the second protrusion 24143 are integrally molded from modified nylon by casting. Since modified nylon is an engineering plastic made by physical or chemical modification of nylon (polyamide) as a base material, the insulating encapsulation structure 2414 formed after curing has high mechanical strength, high dimensional stability, and high heat distortion temperature, thus helping to improve process stability, structural stability, and reliability in use.

[0086] It should be noted that the number of the first protrusions 24142 is the same as the number of the first recesses 24111, and can be one or more, such as one, two, three, four, five, etc. The number of the second protrusions 24143 is the same as the number of the second recesses 24121, and can be one or more, such as one, two, three, four, five, etc. The above numbers are not specifically limited here.

[0087] like Figures 10 to 14 As shown, the pressure limiting component 240 further includes at least one conductive screw 242, with one conductive screw 242 corresponding to two pressure limiting modules 241. In two adjacent pressure limiting modules 241, the conductive screw 242 is threadedly connected to the second electrode 2412 and the first electrode 2411, respectively. This reliably connects two adjacent pressure limiting modules 241, which helps to improve structural stability and operational reliability.

[0088] like Figure 11 , Figure 12 and Figure 14As shown, by way of example, the first electrode 2411 is provided with a first screw hole 24112, the second electrode 2412 is provided with a second screw hole 24122, and the conductive screw 242 passes through the first screw hole 24112 and the second screw hole 24122 respectively.

[0089] like Figure 17 and Figure 18 As shown, in some other embodiments, the voltage limiting component 240 includes a voltage limiting module 241, and both the high-voltage end conductor 220 and the low-voltage end conductor 230 are electrically connected to the voltage limiting module 241. That is, using a single voltage limiting module 241 as the voltage limiting component 240 helps to simplify the assembly process of the surge arrester phase element 200.

[0090] like Figure 1 and Figure 2 As shown, in some embodiments, there are multiple surge arrester phase elements 200, which are arranged at intervals along the circumference of the housing 100.

[0091] It is understood that the surge arrester 1000 with multiple surge arrester phase elements 200 is suitable for gas-insulated switchgear with multi-phase busbars, where one surge arrester phase element 200 corresponds to one phase busbar.

[0092] like Figure 15 and Figure 16 As shown, in some other embodiments, the number of surge arrester phase elements 200 is one, and the surge arrester phase element 200 is coaxially arranged with the housing 100.

[0093] It is understood that the surge arrester 1000 with a single surge arrester phase element 200 is suitable for gas-insulated switchgear with a single-phase bus.

[0094] like Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, the surge arrester 1000 further includes a shielding base 600, a spring contact finger 700, and a third fastener 800. One end of the shielding base 600 is provided with a first mating hole 610, and the other end of the shielding base 600 away from the first mating hole 610 is provided with a second mating hole 620. The shielding base 600 is also provided with a through hole 630 and an annular groove 640. The through hole 630 communicates with the first mating hole 610 and the second mating hole 620 respectively. The high-voltage end conductive element 220 passes through the first mating hole 610. The third fastener 800 passes through the through hole 630 and is connected to the shielding base 600 and the high-voltage end conductive element 220 respectively. The annular groove 640 communicates with the second mating hole 620, and the spring contact finger 700 is disposed in the annular groove 640.

[0095] It is understood that when using the surge arrester 1000 provided in this embodiment, the third fastener 800 is inserted through the through hole 630 and connected to the shielding base 600 and the high-voltage conductive component 220 respectively, so that the high-voltage conductive component 220 is electrically connected to the shielding base 600. Then, the housing 100 is connected and fixed to the busbar pipe of the gas-insulated switchgear, and the contact connected to the busbar is inserted through the second mating hole 620. At this time, the spring contact finger 700 is pressed against the contact, thereby realizing the electrical connection between the busbar and the high-voltage conductive component 220. Among them, the shielding base 600 serves as the mounting base for the spring contact finger 700 and is used to uniform the electric field to reduce the risk of partial discharge of the contact.

[0096] For example, the first fastener 400, the second fastener 140, and the third fastener 800 may be screws, rivets, clips, or may include matching bolts and nuts, without any specific limitation.

[0097] To address the aforementioned technical problems, embodiments of this application also provide a gas-insulated switchgear, including a busbar conduit, a busbar, and a surge arrester 1000 as described in any of the above embodiments. The busbar conduit is connected to the housing 100, the busbar is disposed within the busbar conduit and electrically connected to the high-voltage end conductive element 220, and both the busbar conduit and the low-voltage end conductive element 230 are grounded.

[0098] For example, gas-insulated switchgear may be gas-insulated switchgear using C4F7N as the insulating medium, gas-insulated switchgear using compressed gas as the external insulating medium and combined with a vacuum circuit breaker, gas-insulated switchgear using SF6 gas as the insulating medium, etc., without specific limitations.

[0099] It is understood that since the gas-insulated switchgear provided in this embodiment includes the surge arrester 1000 in any of the above embodiments, it has all the beneficial effects of the surge arrester 1000, which will not be described in detail here.

[0100] In summary, compared to existing surge arresters (using SF6 gas as the insulating medium), the surge arrester 1000 provided in this embodiment has at least the following advantages: First, this surge arrester 1000 eliminates SF6 gas, which can cause the greenhouse effect, thus achieving green environmental protection.

[0101] Second, the 1000 surge arrester eliminates the need for components such as basin insulators, gas valves, and gas monitors, reducing component costs, assembly costs, and operation and maintenance costs, and facilitating miniaturization and simplified assembly processes.

[0102] Third, the surge arrester phase element 200 of the surge arrester 1000 is easy to standardize and mass-produce, and can be applied to different gas-insulated switchgear.

[0103] IV. The surge arrester 1000 has a wide range of applications, and can be used in gas-insulated switchgear using C4F7N as the insulating medium, gas-insulated switchgear using compressed gas as the external insulating medium and combined with vacuum circuit breakers, and gas-insulated switchgear using SF6 gas as the insulating medium, etc.

[0104] Fifth, the interface dimensions of the 1000 surge arrester are compatible with existing surge arresters, eliminating the need to modify the product design of gas-insulated switchgear for replacement.

[0105] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A surge arrester, characterized in that, include: Casing (100); A surge arrester phase element (200) includes a solid insulator (210), a high-voltage conductor (220), a low-voltage conductor (230), and a voltage limiting element (240). At least a portion of the solid insulator (210) is disposed within the housing (100). The voltage limiting element (240) is disposed between the high-voltage conductor (220) and the low-voltage conductor (230). The voltage limiting element (240) is disposed within the solid insulator (210). Both the high-voltage conductor (220) and the low-voltage conductor (230) are electrically connected to the voltage limiting element (240). Both the high-voltage conductor (220) and the low-voltage conductor (230) pass through the solid insulator (210).

2. The surge arrester according to claim 1, characterized in that, The solid insulating component (210) includes a first insulator (211) and a second insulator (212). The first insulator (211) passes through the housing (100), and a portion of the first insulator (211) is disposed within the housing (100). The voltage limiting component (240) is disposed within the first insulator (211). The high-voltage end conductive component (220) and the low-voltage end conductive component (230) both pass through the first insulator (211). The second insulator (212) and the high-voltage end conductive component (220) are located at the same end of the first insulator (211). The second insulator (212) is disposed within the housing (100) and is connected to the first insulator (211) and the housing (100) respectively.

3. The surge arrester according to claim 2, characterized in that, The first insulator (211) and the second insulator (212) are integrally molded by casting the first insulating material.

4. The surge arrester according to claim 3, characterized in that, The first insulating material is one of epoxy resin, polyurethane, silicone and polyester.

5. The surge arrester according to claim 3, characterized in that, The housing (100) includes an outer shell (110) and a first flange (120). The first flange (120) is connected to one end of the outer shell (110). The low-voltage conductive element (230) passes through the end of the outer shell (110) away from the first flange (120). The low-voltage conductive element (230) is insulated from the outer shell (110). The first insulator (211) passes through the first flange (120). A portion of the first insulator (211) is disposed inside the outer shell (110). The second insulator (212) is disposed inside the outer shell (110) and connected to the first flange (120).

6. The surge arrester according to claim 5, characterized in that, The surge arrester also includes a second flange (300) and a plurality of first fasteners (400). The second insulator (212) is arranged around the first insulator (211). The second flange (300) is located inside the housing (110). The second insulator (212) is located between the first flange (120) and the second flange (300). The plurality of first fasteners (400) are arranged at intervals along the circumference of the second flange (300). Each first fastener (400) passes through the second flange (300), the second insulator (212), and the first flange (120), respectively. Each first fastener (400) is connected to the second flange (300) and the first flange (120), respectively.

7. The surge arrester according to claim 5, characterized in that, The surge arrester also includes a first seal (500), which is disposed between the second insulator (212) and the first flange (120), and the first seal (500) surrounds the first insulator (211).

8. The surge arrester according to claim 5, characterized in that, The housing (100) further includes a third flange (130) and a plurality of second fasteners (140). The third flange (130) is disposed between the outer shell (110) and the first flange (120). The third flange (130) is sealed to the outer shell (110). The plurality of second fasteners (140) are arranged at intervals along the circumference of the third flange (130). Each second fastener (140) passes through the third flange (130) and the first flange (120) respectively, and each second fastener (140) is connected to the third flange (130) and the first flange (120) respectively.

9. The surge arrester according to claim 8, characterized in that, The housing (100) further includes a second seal (150) disposed between the first flange (120) and the third flange (130), and the second seal (150) surrounds the second insulator (212).

10. The surge arrester according to any one of claims 1 to 9, characterized in that, The voltage limiting component (240) includes multiple voltage limiting modules (241), which are arranged between the high-voltage end conductor (220) and the low-voltage end conductor (230). Two adjacent voltage limiting modules (241) are electrically connected to each other. The high-voltage end conductor (220) is electrically connected to a voltage limiting module (241) that is away from the low-voltage end conductor (230), and the low-voltage end conductor (230) is electrically connected to a voltage limiting module (241) that is away from the high-voltage end conductor (220).

11. The surge arrester according to claim 10, characterized in that, Each voltage limiting module (241) includes a first electrode (2411), a second electrode (2412), and a plurality of resistors (2413). The plurality of resistors (2413) are arranged between the first electrode (2411) and the second electrode (2412). Adjacent resistors (2413) are electrically connected to each other. The first electrode (2411) is electrically connected to a resistor (2413) located away from the second electrode (2412), and the second electrode (2412) is electrically connected to a resistor (2413) located away from the first electrode (2411). The high-voltage end conductor (220) is electrically connected to the first electrode (2411) of one of the voltage limiting modules (241) located away from the low-voltage end conductor (230), and the low-voltage end conductor (230) is electrically connected to the second electrode (2412) of one of the voltage limiting modules (241) located away from the high-voltage end conductor (220). In two adjacent voltage limiting modules (241), the second electrode (2412) of one of the voltage limiting modules (241) is electrically connected to the first electrode (2411) of the other voltage limiting module (241).

12. The surge arrester according to claim 11, characterized in that, Each of the voltage limiting modules (241) further includes an insulating encapsulation structure (2414), in which a plurality of resistors (2413) are disposed, and the insulating encapsulation structure (2414) is sealed to the first electrode (2411) and the second electrode (2412) respectively.

13. The surge arrester according to claim 12, characterized in that, The insulating encapsulation structure (2414) includes a main body (24141), a first protrusion (24142), and a second protrusion (24143). A plurality of resistors (2413) are disposed in the main body (24141). The first electrode (2411) and the second electrode (2412) are both disposed through the main body (24141). The outer periphery of the first electrode (2411) is provided with a first recess (24111). The first protrusion (24142) is connected to the main body (24141) and embedded in the first recess (24111). The outer periphery of the second electrode (2412) is provided with a second recess (24121). The second protrusion (24143) is connected to the main body (24141) and embedded in the second recess (24121).

14. The surge arrester according to claim 13, characterized in that, The main body (24141), the first protrusion (24142), and the second protrusion (24143) are integrally molded using a second insulating material.

15. The surge arrester according to claim 14, characterized in that, The second insulating material is one of modified nylon, epoxy resin, polyurethane, silicone and polyester.

16. The surge arrester according to claim 11, characterized in that, The pressure limiting component (240) further includes at least one conductive screw (242), one conductive screw (242) corresponds to two pressure limiting modules (241), and in two adjacent pressure limiting modules (241), the conductive screw (242) is threadedly connected to the second electrode (2412) and the first electrode (2411) respectively.

17. The surge arrester according to any one of claims 1 to 9, characterized in that, The pressure limiting component (240) includes a pressure limiting module (241), and the high-voltage end conductive component (220) and the low-voltage end conductive component (230) are both electrically connected to the pressure limiting module (241).

18. The surge arrester according to any one of claims 1 to 9, characterized in that, The number of surge arrester phase elements (200) is multiple, and the multiple surge arrester phase elements (200) are arranged at intervals along the circumference of the housing (100); Alternatively, the number of the surge arrester phase element (200) is one, and the surge arrester phase element (200) is coaxially arranged with the housing (100).

19. The surge arrester according to any one of claims 1 to 9, characterized in that, The surge arrester further includes a shielding base (600), a spring contact finger (700), and a third fastener (800). One end of the shielding base (600) is provided with a first mating hole (610), and the other end of the shielding base (600) away from the first mating hole (610) is provided with a second mating hole (620). The shielding base (600) is also provided with a through hole (630) and an annular groove (640). The through hole (630) is connected to the first mating hole (610) and the second mating hole (620) respectively. The high-voltage end conductive element (220) passes through the first mating hole (610). The third fastener (800) passes through the through hole (630) and is connected to the shielding base (600) and the high-voltage end conductive element (220) respectively. The annular groove (640) is connected to the second mating hole (620), and the spring contact finger (700) is located in the annular groove (640).

20. A gas-insulated switchgear, characterized in that, The device includes a busbar pipe, a busbar, and a surge arrester as described in any one of claims 1 to 19. The busbar pipe is connected to the housing (100), the busbar is disposed inside the busbar pipe and electrically connected to the high-voltage end conductor (220), and both the busbar pipe and the low-voltage end conductor (230) are grounded.

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