Lightning arrester

Abstract

The application relates to a lightning arrester, comprising: a core body comprising an accommodating cavity; the fusing disconnector is positioned on one side of the core body; the first discharge gap is positioned on one side, far away from the core body, of the fusing disconnector; the resistor disc is positioned in the accommodating cavity; the ceramic jacket wraps the core body; a discharge ring surrounding the ceramic jacket; the fusing disconnector comprises a first push rod and a second push rod which penetrate through the ceramic outer sleeve in the second direction. The fusing disconnector comprises a first fusing branch circuit and a second fusing branch circuit, and the first fusing branch circuit and the second fusing branch circuit are connected in parallel between the discharge ring and the resistor disc; one end of the first push rod in the ceramic sleeve abuts against the first fusing branch, and one end of the second push rod in the ceramic sleeve abuts against the second fusing branch; the first fusing branch comprises a first metal block, and the second fusing branch comprises a second metal block; the melting point of the first metal block is lower than that of the second metal block, and / or the volume of the first metal block is smaller than that of the second metal block. The lightning arrester has an early warning function.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a surge arrester. Background Technology

[0002] Metal oxide surge arresters (MOAs) are critical overvoltage protection devices in power systems and are widely used in transmission lines and substations. To prevent explosions or fires caused by breakdown of the zinc oxide resistance elements inside the arrester due to aging, moisture, or manufacturing defects, a thermally fused disconnector is usually integrated into its structure. When a continuous leakage current occurs in the arrester, this disconnector relies on the thermal effect of the current to melt the low-melting-point alloy, causing the metal conductive elements to separate and thus disconnecting the faulty arrester from the power grid.

[0003] However, the relevant technologies have problems such as the inability to provide early warnings and the potential for safety hazards when the thermal explosion release device is activated. Summary of the Invention

[0004] Therefore, it is necessary to provide a surge arrester that aims to solve the problems of the lack of early warning in related technologies and the potential safety hazards caused by the operation of thermally explosive disconnectors.

[0005] According to a first aspect of this application, a surge arrester is provided, comprising:

[0006] The core includes a receiving cavity extending along a first direction;

[0007] A fuse release device is located on one side of the core.

[0008] The first discharge gap is located on the side of the fuse release device away from the core.

[0009] A resistor element is located within the receiving cavity and is electrically connected to the fuse release device;

[0010] An insulating jacket covers the exterior of the fuse release device and the core.

[0011] A discharge ring, at least partially surrounding the outside of the insulating jacket, and electrically connected to the fuse release device;

[0012] The fuse release device includes a first push rod and a second push rod that penetrate the insulating jacket in a second direction, the second direction intersecting the first direction;

[0013] The fuse release device includes a first fuse branch and a second fuse branch, which are connected in parallel between the discharge ring and the resistor.

[0014] One end of the first push rod inside the insulating sleeve abuts against the first fusible branch, and one end of the second push rod inside the insulating sleeve abuts against the second fusible branch;

[0015] The first fusible branch includes a first metal block, and the second fusible branch includes a second metal block;

[0016] The melting point of the first metal block is lower than that of the second metal block, and / or the volume of the first metal block is smaller than that of the second metal block.

[0017] In some embodiments, the first fusible branch includes a first electrode, a first metal block, and a second electrode connected in sequence, and the second fusible branch includes a third electrode, a second metal block, and a fourth electrode connected in sequence.

[0018] The fuse release device includes an upper electrode and a lower electrode; the upper electrode is electrically connected to the discharge ring, and the lower electrode is electrically connected to the resistor element;

[0019] One of the first electrode and the second electrode is electrically connected to the upper electrode, and the other is electrically connected to the lower electrode;

[0020] One of the third electrode and the fourth electrode is electrically connected to the upper electrode, and the other is electrically connected to the lower electrode.

[0021] In some embodiments, the first electrode, the first metal block, the second electrode, the third electrode, the second metal block, and the fourth electrode are arranged sequentially in the second direction;

[0022] The first electrode is electrically connected to the upper electrode, and the second electrode is electrically connected to the lower electrode;

[0023] The fourth electrode is electrically connected to the upper electrode, and the third electrode is electrically connected to the lower electrode.

[0024] In some embodiments, the first push rod abuts against the first electrode;

[0025] The second push rod abuts against the fourth electrode.

[0026] In some embodiments, the first electrode is a prestressed elastic alloy; and / or,

[0027] The fourth electrode is a prestressed elastic alloy.

[0028] In some embodiments, the melting point of the first metal block and the melting point of the second metal block are both 100°C-120°C.

[0029] In some embodiments, the difference between the melting point of the first metal block and the melting point of the second metal block is 20°C-30°C.

[0030] In some embodiments, if the resistor element is damaged and the first metal block melts under the condition of a first current, the first push rod is at least partially ejected from the insulating jacket, and the surge arrester issues a warning.

[0031] When the resistor is damaged and, under the condition of the second current, the first current is less than the second current, both the first metal block and the second metal block melt, the second push rod is at least partially ejected from the insulating jacket, and the surge arrester is disconnected.

[0032] In some embodiments, the surface of the first discharge gap away from the core has a clamping groove; and / or,

[0033] The material of the first discharge gap includes ceramic.

[0034] In some embodiments, the insulating jacket includes a first skirt located on the side of the discharge ring near the first discharge gap. The discharge ring is disposed adjacent to the first skirt, and the length of the first skirt in a third direction is greater than the length of the discharge ring in the third direction, which is perpendicular to the first direction.

[0035] In this embodiment, the fuse release device includes a first push rod and a second push rod penetrating the insulating jacket in a second direction, which intersects with the first direction. The fuse release device includes a first fusible branch and a second fusible branch, connected in parallel between the discharge ring and the resistor element. One end of the first push rod inside the insulating jacket abuts against the first fusible branch, and one end of the second push rod inside the insulating jacket abuts against the second fusible branch. The first fusible branch includes a first metal block, and the second fusible branch includes a second metal block. The melting point of the first metal block is lower than that of the second metal block, and / or the volume of the first metal block is smaller than that of the second metal block. In a first aspect, when the resistor element fails or the surge arrester malfunctions, the first fusible branch provides an early warning function. Under a first current condition, the first metal block melts, and the first push rod ejects at least partially from the insulating jacket, triggering an early warning for the surge arrester. Personnel can replace or remove the damaged portion of the surge arrester in advance, thus achieving the function of early warning. Secondly, when the resistor fails or the surge arrester malfunctions, further, under the condition of a second current, the first current is less than the second current, both the first and second metal blocks melt, the second push rod ejects at least partially from the insulating jacket, the surge arrester is open-circuited, indicating that the surge arrester is completely damaged. Thirdly, under the first current, the current is relatively small, and the pushing force of the first fusible branch on the first push rod is small, which can only form a visual detachment mark to remind personnel to replace or remove the damaged part of the surge arrester; under the second current, the pushing force of the second fusible branch on the second push rod is larger, the second metal block also melts, the second push rod ejects at least partially from the insulating jacket, the surge arrester is open-circuited, indicating that the surge arrester is completely damaged; when the first fusible branch / damaged part of the surge arrester is damaged, personnel replace or remove the damaged part of the surge arrester, thereby preventing the fuse release device from completely detaching or components from the fuse release device from splashing, thus avoiding the risk of safety hazards. Fourthly, a first and a second fuse branch are provided. When one of the first and second fuse branches loses its function due to impact, the first metal block falling off, the second metal block falling off, or other reasons, the other can still work normally, thus improving the reliability of the surge arrester. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of a surge arrester provided for some embodiments of this application.

[0038] Figure 2This is an enlarged schematic diagram of the fuse release device in a surge arrester, provided for some embodiments of this application.

[0039] Figure 3 This is an enlarged schematic diagram of a discharge ring in a surge arrester, provided for some embodiments of this application.

[0040] Reference numerals: surge arrester 100; core 10; fuse release device 20; first discharge gap 30; resistor 40; insulating jacket 50; discharge ring 60; receiving cavity 11; first push rod 21; second push rod 22; first fuse branch 23; second fuse branch 24; first electrode 231; first metal block 232; second electrode 233; third electrode 241; second metal block 242; fourth electrode 243; upper electrode 25; lower electrode 26; first resistor 235; second resistor 245; first direction Y; second direction X; wire clamping groove 30C; conductor end fixing piece 31; first umbrella skirt 51; sealing guide sleeve 52. Detailed Implementation

[0041] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] When describing positional relationships, unless otherwise specified, when an element, such as a layer, film, or substrate, is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more intermediate elements present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more intermediate elements present.

[0044] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0045] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0046] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0047] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0048] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0049] As described in the background section, existing surge arresters suffer from problems such as the inability to provide early warnings and the potential safety hazards arising from the operation of thermally explosive disconnectors. Firstly, existing surge arresters typically have externally mounted thermally explosive disconnectors. When these disconnectors operate, explosives can fly, potentially landing near power lines and posing a safety hazard to other electrical equipment and personnel, thus affecting the stable operation of the power system. Furthermore, existing disconnectors often have plastic casings, which are prone to aging and cracking after prolonged outdoor operation, leading to seal failure and disabling the disconnector. Secondly, existing thermally fused disconnectors employ a single-fuse structure, meaning they only have one set of fuse units. This structure has significant drawbacks, exhibiting insufficient reliability and limited response characteristics.

[0050] In view of the above problems, this application provides a surge arrester that can solve at least one or more of the problems mentioned above.

[0051] Please see Figures 1 to 3 . Figure 1 This is a schematic diagram of the overall structure of a surge arrester provided for some embodiments of this application. Figure 2 This is an enlarged schematic diagram of the fuse release device in a surge arrester, provided for some embodiments of this application. Figure 3 This is an enlarged schematic diagram of a discharge ring in a surge arrester, provided for some embodiments of this application. Figure 2 and Figure 3 All Figure 1 Enlarged schematic diagram of a local structure.

[0052] In a first aspect, this application provides a surge arrester 100, which includes a core 10, a fuse release device 20, a first discharge gap 30, a resistor 40, an insulating jacket 50, and a discharge ring 60. The core 10 includes a receiving cavity 11 extending along a first direction Y; the fuse release device 20 is located on one side of the core 10; the first discharge gap 30 is located on the side of the fuse release device 20 away from the core 10; the resistor 40 is located within the receiving cavity 11 and electrically connected to the fuse release device 20; the insulating jacket 50 covers the fuse release device 20 and the exterior of the core 10; the discharge ring 60 at least partially surrounds the exterior of the insulating jacket 50 and is electrically connected to the fuse release device 20. The fuse release device 20 includes a first push rod 21 and a second push rod 22 penetrating the insulating jacket 50 in a second direction X, where the second direction X intersects the first direction Y. The fuse release device 20 includes a first fuse branch 23 and a second fuse branch 24, which are connected in parallel between the discharge ring 60 and the resistor element 40. One end of a first push rod 21 inside the insulating jacket 50 abuts against the first fuse branch 23, and one end of a second push rod 22 inside the insulating jacket 50 abuts against the second fuse branch 24. The first fuse branch 23 includes a first metal block 232, and the second fuse branch 24 includes a second metal block 242. The melting point of the first metal block 232 is lower than that of the second metal block 242, and / or, the volume of the first metal block 232 is smaller than that of the second metal block 242.

[0053] For example, the core 10 includes a receiving cavity 11 extending along a first direction Y, and the resistor sheet 40 can extend along the first direction Y.

[0054] For example, the second direction X intersects with the first direction Y. The first direction Y can be perpendicular to the second direction Y. For example, the first direction Y is vertical and the second direction X is horizontal.

[0055] For example, the material of resistor 40 may include metal oxides, such as zinc oxide.

[0056] For example, the first fuse branch 23 and the second fuse branch 24 are physically isolated by an insulating partition.

[0057] For example, such as Figure 3 As shown, the discharge ring 60 can be arranged in a ring around the outside of the insulating jacket 50.

[0058] For example, the insulating jacket 50 can be a ceramic jacket.

[0059] For example, one end of the first push rod 21 inside the insulating jacket 50 abuts against the first fusible branch 23, and one end of the second push rod 22 inside the insulating jacket 50 abuts against the second fusible branch 24. When the resistor 40 fails or the surge arrester 100 malfunctions, the first fusible branch 23 serves as a warning; under the condition of the first current, the first metal block 232 melts, and the first push rod 21 is at least partially ejected from the insulating jacket 50, providing a warning for the surge arrester 100. Further, when the resistor 40 fails or the surge arrester 100 malfunctions, under the condition of the second current (where the first current is less than the second current), both the first metal block 232 and the second metal block 242 melt, and the second push rod 22 is at least partially ejected from the insulating jacket 50, breaking the circuit in the surge arrester 100.

[0060] For example, the melting point of the first metal block 232 is lower than that of the second metal block 242, and / or the volume of the first metal block 232 is smaller than that of the second metal block 242. In the event of a failure of the resistor 40 or a malfunction of the surge arrester 100, the first metal block 232 may melt first, causing the first push rod 21 to at least partially eject from the insulating jacket 50, thus providing a warning function for the surge arrester 100. As the current further increases, the second metal block 242 also melts, causing the second push rod 22 to at least partially eject from the insulating jacket 50, thus breaking the circuit in the surge arrester 100.

[0061] For example, in the first fuse branch 23 and the second fuse branch 24, the first fuse branch 23 is used to fuse under a small leakage current to realize fault early warning; the second fuse branch 24 is used to reliably disconnect the main circuit under a large fault current.

[0062] In this embodiment, the fuse release device 20 includes a first push rod 21 and a second push rod 22 penetrating the insulating jacket 50 in a second direction X, where the second direction X intersects the first direction Y. The fuse release device 20 includes a first fuse branch 23 and a second fuse branch 24, which are connected in parallel between the discharge ring 60 and the resistor sheet 40. One end of the first push rod 21 inside the insulating jacket 50 abuts against the first fuse branch 23, and one end of the second push rod 22 inside the insulating jacket 50 abuts against the second fuse branch 24. The first fuse branch 23 includes a first metal block 232, and the second fuse branch 24 includes a second metal block 242. The melting point of the first metal block 232 is lower than that of the second metal block 242, and / or, the volume of the first metal block 232 is smaller than that of the second metal block 242. Firstly, when the resistor element 40 fails or the surge arrester 100 malfunctions, the first fused branch 23 provides an early warning. Under the condition of the first current, the first metal block 232 melts, and the first push rod 21 ejects at least partially from the insulating jacket 50, triggering an early warning for the surge arrester 100. Personnel can then replace or remove the damaged portion of the surge arrester 100 in advance, thus achieving the early warning function. Secondly, when the resistor element 40 fails or the surge arrester 100 malfunctions, further, under the condition of the second current, if the first current is less than the second current, both the first metal block 232 and the second metal block 242 melt, and the second push rod 22 ejects at least partially from the insulating jacket 50, causing the surge arrester 100 to open circuit, indicating complete damage to the surge arrester. Thirdly, during the first current surge, the current is relatively small, and the pushing force of the first fuse branch 23 on the first push rod 21 is small, which can only form a visual detachment mark to remind personnel to replace or remove the damaged part of the surge arrester 100. During the second current surge, the pushing force of the second fuse branch 24 on the second push rod 22 is larger, and the second metal block 242 also melts. The second push rod 22 is at least partially ejected from the insulating jacket 50, and the surge arrester 100 is broken, indicating that the surge arrester is completely damaged. When the first fuse branch 23 / surge arrester 100 is damaged, personnel replace or remove the damaged part of the surge arrester 100, thereby preventing the fuse release device 20 from completely detaching or the components in the fuse release device 20 from splashing, thus avoiding the risk of safety hazards. Fourthly, a first fuse branch 23 and a second fuse branch 24 are provided. When one of the first fuse branch 23 and the second fuse branch 24 loses its function due to impact, the first metal block 232 falling off, the second metal block 242 falling off, or other reasons, the other can still work normally, thus improving the reliability of the surge arrester 100.

[0063] In some embodiments, the first fusible branch 23 includes a first electrode 231, a first metal block 232, and a second electrode 233 connected in sequence, and the second fusible branch 24 includes a third electrode 241, a second metal block 242, and a fourth electrode 243 connected in sequence. The fusible release device 20 includes an upper electrode 25 and a lower electrode 26; the upper electrode 25 is electrically connected to the discharge ring 60, and the lower electrode 26 is electrically connected to the resistor 40; one of the first electrode 231 and the second electrode 233 is electrically connected to the upper electrode 25, and the other is electrically connected to the lower electrode 26; one of the third electrode 241 and the fourth electrode 243 is electrically connected to the upper electrode 25, and the other is electrically connected to the lower electrode 26.

[0064] For example, a current path is formed for the discharge ring 60, the first fusible branch 23, the lower electrode 26 and the resistor 40, as well as a current path for the discharge ring 60, the second fusible branch 24, the lower electrode 26 and the resistor 40.

[0065] For example, one of the first electrode 231 and the second electrode 233 is electrically connected to the upper electrode 25, and the other is electrically connected to the lower electrode 26; one of the third electrode 241 and the fourth electrode 243 is electrically connected to the upper electrode 25, and the other is electrically connected to the lower electrode 26, so that the first fusible branch 23 and the second fusible branch 24 are connected in parallel between the discharge ring 60 and the resistor 40.

[0066] In some embodiments, the first electrode 231, the first metal block 232, the second electrode 233, the third electrode 241, the second metal block 242, and the fourth electrode 243 are arranged sequentially in the second direction X; the first electrode 231 is electrically connected to the upper electrode 25, and the second electrode 233 is electrically connected to the lower electrode 26; the fourth electrode 243 is electrically connected to the upper electrode 25, and the third electrode 241 is electrically connected to the lower electrode 26.

[0067] For example, the first electrode 231, the first metal block 232, the second electrode 233, the third electrode 241, the second metal block 242, and the fourth electrode 243 are arranged sequentially in the second direction X; the first electrode 231 is electrically connected to the upper electrode 25, and the second electrode 233 is electrically connected to the lower electrode 26; the fourth electrode 243 is electrically connected to the upper electrode 25, and the third electrode 241 is electrically connected to the lower electrode 26. The external electrodes of the first fusible branch 23 and the second fusible branch 24 are electrically connected to the discharge ring 60. This provides a parallel connection of the first fusible branch 23 and the second fusible branch 24, and facilitates the first push rod 21 abutting against the first electrode 231 and the second push rod 22 abutting against the fourth electrode 243.

[0068] It should be noted that, in some embodiments, the first fusible branch 23 includes a first electrode 231, a first metal block 232, a second electrode 233, and a first resistor 235 connected in sequence, and the second fusible branch 24 includes a third electrode 241, a second metal block 242, a fourth electrode 243, and a second resistor 245 connected in sequence. The first resistor 235 and the second resistor 245 serve to limit the current magnitude, preventing a sudden surge in current in each fusible branch of the fuse release device 20, and preventing problems such as explosive material splashing when the fuse release device 20 is activated.

[0069] In some embodiments, the first push rod 21 abuts against the first electrode 231; the second push rod 22 abuts against the fourth electrode 243.

[0070] For example, the first push rod 21 abuts against the first electrode 231; the second push rod 22 abuts against the fourth electrode 243. That is, the first push rod 21 abuts against the one of the first electrode 231 and the second electrode 233 that is closer to the insulating jacket 50, so that the first push rod 21 can be ejected.

[0071] For example, the first push rod 21 abuts against the first electrode 231; the second push rod 22 abuts against the fourth electrode 243. That is, the second push rod 22 abuts against the one of the third electrode 241 and the fourth electrode 243 closest to the insulating jacket 50, so that the second push rod 22 can be ejected.

[0072] In some embodiments, the first electrode 231 is a prestressed elastic alloy; and / or, the fourth electrode 243 is a prestressed elastic alloy.

[0073] For example, the first push rod 21 abuts against the first electrode 231; the second push rod 22 abuts against the fourth electrode 243. At least one of the first electrode 231 and the fourth electrode 243 can be a free-end electrode, and at least one of the second electrode 233 and the third electrode 241 is a fixed-end electrode.

[0074] For example, the fuse release device 20 is a multi-stage redundant hot-melt release device. The fuse release device 20 is also equipped with a mechanical indicating mechanism. The first fuse branch includes a fixed end electrode and a free end electrode. The free end electrode is a prestressed elastic metal sheet. Under normal conditions, its free end is tightly attached to and electrically connected to the corresponding fixed end electrode through a low melting point alloy, and is in an elastic energy storage state. One end of the first push rod 21 abuts against the outer side of the free end electrode of the first fuse branch 23, and the other end passes through the sealing guide sleeve 52 of the side wall of the insulating jacket 50 (insulating jacket).

[0075] For example, one end of the second push rod 22 abuts against the outer side of the free end electrode of the second fusible branch 24, and the other end passes through the sealing guide sleeve 52 of the side wall of the insulating jacket 50 (insulating jacket).

[0076] For example, in the normal assembly state, the free end electrode is prestressed and pressed against the fixed end electrode. The contact surfaces of the two are filled with a cured low-melting-point alloy layer (first metal block 232 and / or second metal block 242). The low-melting-point alloy layer not only achieves tight bonding and conductivity between the two electrodes, but also counteracts the prestress elastic force of the free end electrode, keeping the free end electrode pressed against the fixed end electrode and in an elastic energy storage state. When the low-melting-point alloy layer (first metal block 232 and / or second metal block 242) melts due to heat, its bonding and supporting effect on the free end electrode disappears. The prestressed elastic alloy quickly bounces away from the outside of the surge arrester due to the elastic restoring force, generating displacement, which directly pushes the push rod (first push rod 21 and / or second push rod 22) to move outward, protruding from the outer surface of the insulating jacket, forming an identifiable visual detachment mark.

[0077] In some embodiments, the melting point of the first metal block 232 and the melting point of the second metal block 242 are both 100°C-120°C.

[0078] For example, the melting point of the first metal block 232 is any one of 100°C, 102°C, 105°C, 107°C, 110°C, 112°C, 115°C, 117°C, or 120°C.

[0079] For example, the melting point of the second metal block 242 is any one of 100°C, 102°C, 105°C, 107°C, 110°C, 112°C, 115°C, 117°C, or 120°C.

[0080] In some embodiments, the difference between the melting point of the first metal block 232 and the melting point of the second metal block 242 is 20°C-30°C.

[0081] For example, the difference between the melting point of the first metal block 232 and the melting point of the second metal block 242 is any value among 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C, and 30°C. For example, the melting point of the second metal block 242 is 20°C higher than that of the first metal block 232, or 25°C higher, or 30°C higher.

[0082] In some embodiments, if the resistor element 40 is damaged and under the condition of the first current, the first metal block 232 melts, the first push rod 21 is at least partially ejected from the insulating jacket 50, and the surge arrester 100 issues a warning. If the resistor element 40 is damaged and under the condition of the second current, the first current is less than the second current, both the first metal block 232 and the second metal block 242 melt, the second push rod 22 is at least partially ejected from the insulating jacket 50, and the surge arrester 100 breaks the circuit.

[0083] For example, one end of the first push rod 21 inside the insulating jacket 50 abuts against the first fusible branch 23, and one end of the second push rod 22 inside the insulating jacket 50 abuts against the second fusible branch 24. When the resistor 40 fails or the surge arrester 100 malfunctions, the first fusible branch 23 serves as a warning. Under the condition of the first current, the first metal block 232 melts, and the first push rod 21 is at least partially ejected from the insulating jacket 50, providing a warning for the surge arrester 100. Further, when the resistor 40 fails or the surge arrester 100 malfunctions, the current increases. As the current increases, under the condition of the second current, the first current is less than the second current, and both the first metal block 232 and the second metal block 242 melt. The second push rod 22 is at least partially ejected from the insulating jacket 50, and the surge arrester 100 is disconnected.

[0084] In some embodiments, the surface of the first discharge gap 30 away from the core 10 has a clamping groove 30C; and / or, the material of the first discharge gap 30 includes ceramic.

[0085] For example, the wire clamping groove 30C can be located on the surface of the first discharge gap 30 away from the core 10, and the wire can be fixed to the wire clamping groove 30C.

[0086] For example, in some embodiments, the first discharge gap 30 may be ceramic. In other embodiments, the first discharge gap 30 may further include a wire end retainer 31, with a wire clamping groove 30C located on the surface of the wire end retainer 31 away from the fuse release device 20. The wire end retainer 31 is made of a metallic conductive material and forms an external discharge gap with the discharge ring 60.

[0087] For example, by setting the first discharge gap 30, the discharge ring 60 is fixed to the insulating jacket 50 by bolts, and a discharge gap is formed between the discharge ring 60 and the conductor. The discharge gap is stable, which avoids the failure of insulation coordination and the failure of surge arrester 100 protection caused by the instability of the discharge gap. The outer diameter of the discharge ring 60 is smaller than the outer diameter of the porcelain jacket, which avoids the phenomenon of rainwater dripping short circuit between the conductor and the discharge ring, and improves the reliability of power supply of the line.

[0088] In some embodiments, the insulating jacket 50 includes a first skirt 51 located on the side of the discharge ring 60 near the first discharge gap 30. The discharge ring 60 and the first skirt 51 are disposed adjacent to each other, and the length of the first skirt 51 in the third direction is greater than the length of the discharge ring 60 in the third direction, which is perpendicular to the first direction Y.

[0089] For example, the length of the first umbrella skirt 51 in the third direction is greater than the length of the discharge ring 60 in the third direction, that is, the outer diameter of the discharge ring 60 is smaller than the outer diameter of the porcelain jacket, so as to avoid the phenomenon of rainwater dripping short circuit between the conductor and the discharge ring and improve the reliability of power supply of the line.

[0090] In this embodiment, firstly, the fuse release device 20 employs multiple parallel fuse branches, so even if one branch fails, the remaining branches can still complete the release action, significantly reducing the risk of single-point failure. Secondly, by designing the parameters of the fuse branches (first fuse branch 23 and second fuse branch 24) differently, a dual function of "early warning + cut-off" can be achieved; after the release action, an indicator flag automatically pops up, facilitating ground inspection or drone identification without power outages for pole climbing.

[0091] It should be noted that, in some embodiments, the first metal block 232 in the first fusion break branch 23 is a low-melting-point metal with a melting point of 100℃-120℃; the second metal block 242 in the second fusion break branch 24 is a low-melting-point metal with a melting point of 100℃-120℃.

[0092] It should be noted that in some other embodiments, the first metal block 232 in the first fusible branch 23 is a low melting point metal with a melting point of 100℃-120℃; the second fusible branch 24 can be a thermal explosion release unit.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A surge arrester, characterized by, The arrester comprises: a core body comprising a receiving cavity extending along a first direction; a fuse disconnecting device located at one side of the core body; a first discharge gap located at a side of the fuse disconnecting device away from the core body; a resistance sheet located in the receiving cavity and electrically connected to the fuse disconnecting device; an insulating sheath wrapping the outside of the fuse disconnecting device and the core body; a discharge ring at least partially surrounding the outside of the insulating sheath and electrically connected to the fuse disconnecting device; wherein the fuse disconnecting device comprises a first push rod and a second push rod penetrating the insulating sheath in a second direction intersecting the first direction; the fuse disconnecting device comprises a first fuse branch and a second fuse branch, the first fuse branch and the second fuse branch being connected in parallel between the discharge ring and the resistance sheet; one end of the first push rod in the insulating sheath abuts against the first fuse branch, and one end of the second push rod in the insulating sheath abuts against the second fuse branch; the first fuse branch comprises a first metal block, and the second fuse branch comprises a second metal block; the melting point of the first metal block is lower than the melting point of the second metal block, and / or the volume of the first metal block is smaller than the volume of the second metal block.

2. The arrester according to claim 1, wherein: the first fuse branch comprises a first electrode, the first metal block and a second electrode connected in sequence, and the second fuse branch comprises a third electrode, the second metal block and a fourth electrode connected in sequence; the fuse disconnecting device comprises an upper electrode and a lower electrode; the upper electrode is electrically connected to the discharge ring, and the lower electrode is electrically connected to the resistance sheet; one of the first electrode and the second electrode is electrically connected to the upper electrode, and the other is electrically connected to the lower electrode; one of the third electrode and the fourth electrode is electrically connected to the upper electrode, and the other is electrically connected to the lower electrode.

3. The arrester according to claim 2, wherein: the first electrode, the first metal block, the second electrode, the third electrode, the second metal block and the fourth electrode are arranged in sequence in the second direction; the first electrode is electrically connected to the upper electrode, and the second electrode is electrically connected to the lower electrode; the fourth electrode is electrically connected to the upper electrode, and the third electrode is electrically connected to the lower electrode.

4. The arrester according to claim 3, wherein: the first push rod abuts against the first electrode; and the second push rod abuts against the fourth electrode.

5. The arrester according to claim 2, wherein: the first electrode is a pre-stressed elastic alloy; and / or the fourth electrode is a pre-stressed elastic alloy.

6. The arrester according to claim 1, wherein: the melting point of the first metal block and the melting point of the second metal block are both 100-120℃.

7. The arrester according to claim 6, wherein: the difference between the melting point of the first metal block and the melting point of the second metal block is 20-30℃.

8. The arrester according to claim 1, wherein: The resistance disc is damaged, and under the condition of the first current, the first metal block is melted, the first push rod is at least partially ejected from the insulating sleeve, and the lightning arrester is prewarned. The resistance disc is damaged, and under the condition of the second current, the first current is smaller than the second current, the first metal block and the second metal block are both melted, the second push rod is at least partially ejected from the insulating sleeve, and the lightning arrester is tripped.

9. The lightning arrester of claim 1, wherein, the first discharge gap has a wire clamping groove away from the surface of the core; and / or, the material of the first discharge gap comprises ceramic.

10. The lightning arrester of claim 1, wherein, the insulating sleeve comprises a first shed, the first shed is located on the side of the discharge ring close to the first discharge gap, the discharge ring is arranged adjacent to the first shed, and the length of the first shed in a third direction is greater than the length of the discharge ring in the third direction, the third direction being perpendicular to the first direction.

Images