A combined protection device for transmission lines

Abstract

An embodiment of the present application provides a combined protection device for a transmission line, which relates to the technical field of protection devices for transmission lines. The combined protection device for a transmission line includes: a bracket, on which there are a first connection member, a second connection member, and a third connection member for respectively connecting a transmission line; a fuse, which is arranged on the bracket, one end of the fuse is electrically connected to the first connection member, and the other end is electrically connected to the second connection member; a lightning arrester, which is arranged on the bracket, one end of the lightning arrester is electrically connected to the first connection member, and the other end is electrically connected to the third connection member. The combined protection device for a transmission line provided by the embodiment of the present application solves the problem of poor installation effect of the protection device in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of transmission line protection devices, and particularly to a combined transmission line protection device. Background Art

[0002] Currently, protection devices are usually installed in transmission lines to improve the safety performance of transmission lines.

[0003] In related technologies, the protection device can be a lightning arrester for protecting the transmission line from overvoltage damage; the protection device can also be a fuse as an overload protection device for the transmission line.

[0004] However, the above protection devices are usually installed in the same transmission line in sequence, resulting in a large workload. Summary of the Invention

[0005] Embodiments of this application provide a combined transmission line protection device to solve the problem of poor installation effect of protection devices in the prior art.

[0006] A combined transmission line protection device provided by an embodiment of this application includes:

[0007] A bracket, on which there are a first wiring component, a second wiring component, and a third wiring component for respectively connecting a transmission line;

[0008] A fuse, which is arranged on the bracket, one end of the fuse is electrically connected to the first wiring component, and the other end is electrically connected to the second wiring component;

[0009] A lightning arrester, which is arranged on the bracket, one end of the lightning arrester is electrically connected to the first wiring component, and the other end is electrically connected to the third wiring component.

[0010] In a possible implementation manner, the bracket includes a main frame and a support plate arranged on the top of the main frame, the first wiring component is arranged on the support plate, and the second wiring component and the third wiring component are arranged on the main frame.

[0011] In a possible implementation manner, one end of the fuse is rotatably connected to the second wiring component, the other end is detachably connected to the support plate, and the fuse is arranged in an inclined manner.

[0012] In a possible implementation manner, one end of the lightning arrester is rotatably connected to the third wiring component, the other end is detachably connected to the support plate, and the lightning arrester is arranged in an inclined manner;

[0013] The lightning arrester is provided with a disconnection component. The lightning arrester is electrically connected to the third connection member through the disconnection component. The disconnection component is configured to automatically separate from the lightning arrester when a short circuit occurs in the transmission line, so as to cut off the electrical connection between the lightning arrester and the transmission line. Subsequently, the lightning arrester rotates away from the first connection member under its own gravity.

[0014] In a possible implementation manner, the disconnection component includes a conductive support member and a disconnector that are connected to each other. The disconnector is detachably arranged at one end of the lightning arrester facing the third connection member. The lightning arrester is electrically connected to the third connection member through the conductive support member and the disconnector.

[0015] In a possible implementation manner, the bracket further includes a plurality of post insulators. The post insulators are arranged on the main frame. The support plate and / or the second connection member are connected to the main frame through the post insulators.

[0016] In a possible implementation manner, the fuse and the lightning arrester are respectively located on opposite sides of the bracket.

[0017] In a possible implementation manner, a plurality of rain covers are arranged on the bracket. The rain covers cover above the fuse or the lightning arrester.

[0018] In a possible implementation manner, the fuse includes a fuse carrier tube. The fuse carrier tube includes an outer tube made of epoxy glass composite and an inner tube made of polymer material composite. The outer tube is coaxially sleeved on the inner tube.

[0019] In a possible implementation manner, a heat-resistant layer is arranged at one end of the fuse facing the first connection member. The fuse is in contact with the first connection member through the heat-resistant layer.

[0020] A combined protection device for a transmission line provided by an embodiment of the present application is provided by setting: a bracket having a first connection member, a second connection member, and a third connection member for respectively connecting a transmission line; a fuse arranged on the bracket, one end of the fuse being electrically connected to the first connection member and the other end being electrically connected to the second connection member; a lightning arrester arranged on the bracket, one end of the lightning arrester being electrically connected to the first connection member and the other end being electrically connected to the third connection member. Thus, during installation, only the bracket needs to be fixed, and then the first connection member, the second connection member, and the third connection member are connected to the transmission line, and the fuse and the lightning arrester can be jointly connected to the transmission line. Compared with separately transporting and installing the fuse and the lightning arrester, the installation steps are greatly saved, the operation and maintenance cost is reduced, and the problem of poor installation effect of the protection device in the prior art is solved. Description of the Drawings

[0021] The accompanying drawings herein are incorporated into and constitute a part of the specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0022] Figure 1 Schematic structural diagram of a combined protection device for a transmission line provided for the present application;

[0023] Figure 2 is Figure 1 Enlarged structural diagram of part A in

[0024] Figure 3 is Figure 1 Schematic structural diagram of the core body of the arrester in

[0025] Figure 4 is Figure 1 Schematic structural diagram of the fuse in

[0026] Figure 5 is Figure 4 Partially sectional structural diagram of the fuse carrier tube in

[0027] Figure 6 is Figure 4 Partially sectional structural diagram of the fuse element inside the fuse in

[0028] Explanation of reference numerals:

[0029] 100 - Bracket;

[0030] 110 - First wiring component; 120 - Second wiring component; 130 - Third wiring component; 140 - Main frame; 150 - Support plate; 151 - Connecting frame; 160 - First post insulator; 170 - Second post insulator;

[0031] 200 - Fuse; 210 - Fuse carrier tube; 211 - Outer tube; 212 - Inner tube; 220 - Heat - resistant layer; 230 - Fuse element; 231 - Lead wire; 232 - Auxiliary arc - extinguishing tube; 233 - Melt; 234 - Tension wire; 235 - Connection terminal; 240 - High - voltage fuse wire;

[0032] 300 - Arrester; 310 - Glass fiber layer; 320 - Varistor disc;

[0033] 400 - Disconnector assembly; 410 - Conductive support; 420 - Disconnector;

[0034] 500 - Pulling ring;

[0035] 600 - Rain cover.

[0036] Through the above-mentioned accompanying drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Description of the Embodiments

[0037] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] In the related art, a protection device is usually installed in a power transmission line to improve the safety performance of the power transmission line. The protection device can be a lightning arrester, so that the power transmission line is grounded after passing through the lightning arrester to protect the power transmission line from damage caused by overvoltage; the protection device can also be a fuse, which is used as an overload protection device for the power transmission line.

[0039] However, fuses and lightning arresters are usually installed separately, but are usually used in the same power transmission line. During installation, the fuse is first fixed to the installation site on-site, and then the two ends of the fuse are electrically connected to the power transmission line respectively; then the lightning arrester is fixed to the installation site on-site, and then the two ends of the lightning arrester are electrically connected to the power transmission line respectively. It can be seen that the convenience during the installation process of fuses and lightning arresters is relatively low and the workload is relatively large.

[0040] Based on this, the embodiments of the present application provide a combined protection device for a power transmission line. The combined protection device for a power transmission line provided by the embodiments of the present application is provided with: a bracket, which has a first wiring member, a second wiring member, and a third wiring member for respectively connecting the power transmission line; a fuse, which is arranged on the bracket, one end of the fuse is electrically connected to the first wiring member, and the other end is electrically connected to the second wiring member; a lightning arrester, which is arranged on the bracket, one end of the lightning arrester is electrically connected to the first wiring member, and the other end is electrically connected to the third wiring member. Thus, during installation, only the bracket needs to be fixed, and then the first wiring member, the second wiring member, and the third wiring member are connected to the power transmission line, and the fuse and the lightning arrester can be jointly connected to the power transmission line. Compared with separately transporting and installing the fuse and the lightning arrester, the installation steps are greatly saved, the operation and maintenance costs are reduced, and the problem of poor installation effect of the protection device in the prior art is solved.

[0041] The following uses specific embodiments to elaborate in detail on the technical solutions of this application and how the technical solutions of this application solve the above technical problems. These several specific embodiments below can be combined with each other, and for the same or similar concepts or processes, they may not be repeated in some embodiments. The embodiments of this application will be described below in conjunction with the accompanying drawings.

[0042] As Figure 1 shown, a combined protection device for a transmission line provided by an embodiment of this application includes:

[0043] A bracket 100, on which there are a first connection member 110, a second connection member 120, and a third connection member 130 for respectively connecting to the transmission line;

[0044] A fuse 200, the fuse 200 is arranged on the bracket 100, one end of the fuse 200 is electrically connected to the first connection member 110, and the other end is electrically connected to the second connection member 120;

[0045] A lightning arrester 300, the lightning arrester 300 is arranged on the bracket 100, one end of the lightning arrester 300 is electrically connected to the first connection member 110, and the other end is electrically connected to the third connection member 130.

[0046] In this embodiment, the first connection member 110 is located at the upper part of the bracket 100, and the second connection member 120 and the third connection member 130 are located at the lower part of the bracket 100.

[0047] Exemplarily, the first connection member 110, the second connection member 120, and the third connection member 130 can each include a conductive sheet and a clamping screw. The conductive sheet is fixed on the bracket 100 by screwing, welding, or other means, and the clamping screw is threadedly connected to the conductive sheet. During installation, the wire in the transmission line can be tightly connected to the conductive sheet through the clamping screw, so as to connect the first connection member 110, the second connection member 120, or the third connection member 130 to the transmission line. Of course, the clamping screw can also be replaced with a wire clamp, a buckle, or other fasteners.

[0048] During installation, only the bracket 100 needs to be fixed, and then the first connection member 110, the second connection member 120, and the third connection member 130 are connected to the transmission line, so that the fuse 200 and the lightning arrester 300 can be jointly connected to the transmission line. Compared with separately installing the fuse 200 and the lightning arrester 300 (that is, a total of four connection terminals are respectively connected to the transmission line), the installation steps are greatly saved, the operation and maintenance costs are reduced, and the problem of poor installation effect of the protection device in the prior art is solved.

[0049] As Figure 1As shown, in some embodiments, the bracket 100 includes a main frame 140 and a support plate 150 disposed on top of the main frame 140. The first wiring member 110 is disposed on the support plate 150, and the second wiring member 120 and the third wiring member 130 are disposed on the main frame 140.

[0050] It should be noted that the support plate 150 is horizontally disposed, connected to the main frame 140, and located above the main frame 140. The first wiring member 110 is fixed on the support plate 150.

[0051] The second wiring member 120 and the third wiring member 130 are respectively fixed on opposite side walls of the main frame 140. Specifically, the conductive sheets in the second wiring member 120 and the third wiring member 130 can be fixed to the main frame 140 by screwing. Of course, other fixing methods can also be used, and there is no limitation thereto.

[0052] Thus, during installation, only the main frame 140 needs to be fixed to the on-site installation location, then the fuse 200 and the lightning arrester 300 can be fixed to the site, and then only the power transmission line needs to be connected.

[0053] As Figure 1 shown, further, one end of the fuse 200 is rotatably connected to the second wiring member 120, and the other end is detachably connected to the support plate 150. The fuse 200 is inclined.

[0054] One end of the lightning arrester 300 is rotatably connected to the third wiring member 130, and the other end is detachably connected to the support plate 150. The lightning arrester 300 is inclined;

[0055] The lightning arrester 300 is provided with a disconnection assembly 400. The lightning arrester 300 is electrically connected to the third wiring member 130 through the disconnection assembly 400. The disconnection assembly 400 is configured to automatically separate from the lightning arrester 300 when a short circuit occurs in the power transmission line to cut off the electrical connection between the lightning arrester 300 and the power transmission line. Subsequently, the lightning arrester 300 rotates away from the first wiring member 110 under its own gravity.

[0056] As Figure 1 shown, in this embodiment, the second wiring member 120 and the third wiring member 130 are respectively located on opposite sides of the main frame 140, so that after the fuse 200 and the lightning arrester 300 are installed on the bracket, they can be respectively located on opposite sides of the bracket 100 to balance the overall weight of the bracket 100, facilitate improving the stability after on-site installation, and are not prone to tipping to one side.

[0057] Specifically, one end of the fuse 200 is detachably connected to the support plate 150 and electrically connected to the first terminal 110 at this end; the other end is rotatably connected to the second terminal 120 through a free hinge structure and electrically connected to the second terminal 120 at this end. One end of the lightning arrester 300 is detachably connected to the support plate 150 and electrically connected to the first terminal 110 at this end; the other end is rotatably connected to the third terminal 130 through a free hinge structure and electrically connected to the third terminal 130 at this end. The fuse 200 and the lightning arrester 300 are both inclined. Continuing to refer to Figure 1 , preferably, the angles between the fuse 200 and the lightning arrester 300 and the plumb line are both 15° to 20°.

[0058] In this embodiment, connection brackets 151 are provided at both opposite ends of the support plate 150. The connection brackets 151 have card slots, so that the upper ends of the fuse 200 or the lightning arrester 300 can be snapped into the card slots on the connection brackets 151 to achieve the detachable connection of the fuse 200 or the lightning arrester 300 to the support plate 150.

[0059] In some embodiments, highly elastic energy storage springs can also be added to the upper ends of the fuse 200 or the lightning arrester 300 to be connected to the connection brackets 151 through the energy storage springs. This reduces the thermal shock during contact, and at the same time solves the contact resistance and pressure of the moving and static contacts, ensures the recoverability of the contact pressure, and provides guarantee for long-term operation.

[0060] During implementation, by way of example, the support plate 150 and the connection brackets 151 can be made of conductive materials, so that when the upper end of the fuse 200 or the upper end of the lightning arrester 300 is connected to the connection bracket 151, electrical connection with the first terminal 110 is achieved. The support plate 150 and the connection brackets 151 can also be made of insulating materials, and then additional conductive sheets are added to the support plate 150, so that one end of the conductive sheet is connected to the first terminal 110 and the other end is in contact with the upper end of the fuse 200 or the lightning arrester 300, thereby achieving electrical connection with the first terminal 110. There is no limitation on this.

[0061] During installation, after the lower ends of the fuse 200 and the lightning arrester 300 are respectively rotatably connected to the second terminal 120 and the third terminal 130 through free hinge structures, the upper ends of the fuse 200 and the lightning arrester 300 are respectively snapped into the card slots on the two connection brackets 151. Secondly, the detachment assembly 400 is installed at the lower end of the lightning arrester 300, thereby completing the installation of the fuse 200 and the lightning arrester 300 on the bracket 100.

[0062] During operation, after the fuse 200 blows, the part of the fuse 200 connected to the second connection piece 120 will freely fall under its own gravity. When a short circuit occurs in the transmission line or the arrester 300, the detachment component 400 automatically separates from the arrester 300 to cut off the electrical connection between the arrester 300 and the transmission line. Then, the arrester 300 will freely fall under its own gravity to separate the arrester 300 from the transmission line, reducing the possibility of further damage to the arrester 300 in the future. At the same time, it is convenient for the staff to detect abnormalities in time and maintain the fuse 200 and the arrester 300, improving the use convenience and solving the problem of poor installation effect of the protection device in the prior art.

[0063] It should be noted that free fall means that no additional power source is required for control, so that when the fuse 200 or the arrester 300 is not restricted by external forces, it will freely rotate relative to the rotational connection part.

[0064] It should also be noted that the upper end of the fuse 200 is on the side of the lower end of the fuse 200 away from the bracket 100, and the upper end of the arrester 300 is on the side of the lower end of the arrester 300 away from the bracket 100. When the fuse 200 or the arrester 300 undergoes free fall, it can rotate in the direction away from the bracket 100, reducing the possibility of hitting the bracket 100 and ensuring the safety of the falling process.

[0065] Among them, for the free hinge structure, exemplarily, the rotational connection can be achieved through a rotating shaft. During implementation, a limiting component can also be provided on the side of the rotating part away from the support plate 150 to limit the rotation range of the fuse 200 or the arrester 300, further improving the safety during operation. Of course, other free hinge structures can also be used, and there is no limitation in this regard.

[0066] It should be noted that the free hinge structure can be made of insulating material, and then an additional high-voltage fuse 240 (such as high-purity silver, silver-copper alloy or nickel-chromium alloy material, with excellent fault current breaking ability) is used to electrically connect the lower end of the fuse 200 to the second connection piece 120.

[0067] On the basis that the free hinge structure is made of insulating material, the lower end of the arrester 300 is only electrically connected to the third connection piece 130 through the detachment component 400, and the detachment component 400 has a certain supporting effect on the arrester 300. When the upper end of the arrester 300 contacts the support plate 150, the detachment component 400 supports the arrester 300 in the current position to ensure the stability of the arrester 300 after it is connected to the transmission line.

[0068] When a short circuit occurs in the transmission line or the lightning arrester 300, the detachment component 400 automatically separates from the lightning arrester 300 to cut off the connection between the lightning arrester 300 and the transmission line. At the same time, the detachment component 400 will release the supporting effect on the lightning arrester 300, and then the lightning arrester 300 will freely fall under its own gravity.

[0069] In other embodiments, the detachment component 400 can also connect the upper end of the lightning arrester 300 to the first wiring component 110. So that after the detachment component 400 detaches from the lightning arrester 300, the lightning arrester 300 can also freely fall.

[0070] As Figure 1 and Figure 2 shown, in some embodiments, the detachment component 400 includes a conductive support member 410 and a disconnector 420 that are connected to each other. The disconnector 420 is detachably arranged at one end of the lightning arrester 300 facing the third wiring component 130. The lightning arrester 300 is electrically connected to the third wiring component 130 through the conductive support member 410 and the disconnector 420.

[0071] In this embodiment, the disconnector 420 is sleeved on the lower end of the lightning arrester 300. One end of the conductive support member 410 is connected to the disconnector 420, and the other end is rotatably connected to the third wiring component 130. The conductive support member 410 can be a rigid conductive rod or other components. So that while the conductive support member 410 plays a conductive role, it also has a supporting effect on the lightning arrester 300. After the lightning arrester 300 is connected to the support plate 150, the conductive support member 410 can position the lightning arrester 300 at the current position.

[0072] It should be noted that the disconnector 420 can adopt existing components. Its principle is that when an abnormal fault or short circuit occurs in the lightning arrester 300, the power frequency short-circuit current is used to make the disconnector 420 act, and the disconnector 420 automatically disconnects from the lightning arrester 300.

[0073] When the disconnector 420 detaches from the lightning arrester 300, it will fall downward. Then the lightning arrester 300 will lose the supporting effect of the conductive support member 410. Subsequently, under the action of its own gravity, the lightning arrester 300 will turn downward (i.e., freely fall), away from the support plate 150 and the first wiring component 110, thereby separating the lightning arrester 300 from the transmission line, reducing the possibility of further damage to the lightning arrester 300 in the future, and at the same time making it easy for the staff to discover and maintain or replace it in time.

[0074] As Figure 1 shown, further, the bracket 100 further includes a plurality of post insulators. The post insulators are arranged on the main frame 140. The support plate 150 and / or the second wiring component 120 are connected to the main frame 140 through the post insulators.

[0075] In this embodiment, there are two post insulators, namely the first post insulator 160 and the second post insulator 170 respectively.

[0076] The first post insulator 160 extends vertically. The lower end of the first post insulator 160 can be fixed to the main frame 140 by screwing or other means, and the support plate 150 can be fixed to the upper end of the first post insulator 160 by screwing or other means.

[0077] The second post insulator 170 extends horizontally. One end of the second post insulator 170 is fixed to the main frame 140 by screwing or other means, and the second terminal 120 is fixed to the other end of the second post insulator 170 by screwing or other means.

[0078] Thus, through each post insulator, the overall insulation effect of the bracket 100 is improved, making the safety of the main frame 140 relatively high after fixation.

[0079] In some embodiments, the post insulator can be made of high thermal conductivity silicone rubber, which has the general characteristics of an elastomer, as well as excellent electrical insulation, ozone resistance, heat resistance and cold resistance, ensuring the external insulation performance of the device.

[0080] As Figure 1 shown, in some embodiments, in order to improve the convenience of installing the fuse 200 or the arrester 300, pull rings 500 are provided on both the fuse 200 and the arrester 300. Thus, the fuse 200 or the arrester 300 can be controlled through the pull ring 500, so that the fuse 200 or the arrester 300 is clamped to or away from the connecting frame 151, and the operation process is relatively convenient.

[0081] As Figure 1 shown, in some embodiments, a plurality of rain covers 600 are provided on the bracket 100, and the rain covers 600 cover above the fuse 200 or the arrester 300.

[0082] In this embodiment, the rain cover 600 can be made of Q235 hot-dip galvanized material, or can be replaced by 304 stainless steel material or other anti-corrosion metal materials, and there is no limitation on this. There are two rain covers 600. Of course, it can also be other quantities. The two rain covers 600 are respectively arranged above the fuse 200 and the arrester 300, so that the rain cover 600 has a certain rain-blocking effect.

[0083] During implementation, the rain cover 600 can be fixed to the connecting frame 151 by screwing or other means, or the rain cover 600 can be fixed to the support plate 150, and there is no limitation on this.

[0084] In this embodiment, by way of example, as Figure 3As shown, the arrester 300 has a core inside, and the core includes varistors 320 and a fiberglass layer 310 that wraps the varistors 320.

[0085] The arrester 300 can be a metal oxide arrester 300 or others. The arrester 300 has a core inside. The core can use the fiberglass layer 310 to tie the varistors 320 and set multiple weak points around the circumference of the varistors 320. Among them, the fiberglass layer 310 can be made by winding and tying epoxy-free fiberglass outside the varistors 310. In this regard, multiple weak points (i.e., pressure release ports) are set in the core inside the arrester 300, aiming to solve the problem that when a short circuit occurs in the transmission line, the strong electrodynamic force forms a pressure release channel through the weak points, so that the arrester 300 is not likely to cause comminuted explosion to damage the transmission line or pose a threat to personnel safety. And, the short-circuit current of the arrester 300 is relatively high (more than 20% higher than that of the Duriton core structure) to ensure the safe operation of the transmission line.

[0086] It should be supplemented that the arrester 300 in this embodiment has multiple pressure release channels, making its pressure release capacity 1.5 times that of the corresponding products in the same industry, so as to be more suitable for the short-circuit protection of the transmission line in heavy-load and strong-lightning areas.

[0087] Exemplarily, the fuse 200 can be a high-molecular material insulated fuse tube, and a high-voltage current-limiting fuse (matched according to the current of the protected equipment) is designed inside it. When working normally, the fuse forms a closed position after being tensioned. When a fault occurs in the system, the fault current quickly melts the fuse and forms an arc. The internal arc extinguishing tube is heated by the arc, decomposes a large amount of gas, forms a very high pressure inside the tube, and forms longitudinal blowing along the pipeline, and the arc is quickly elongated and extinguished. After the fuse 200 melts, one end of the fuse 200 connected to the second terminal 120 freely drops to form an obvious open position. In addition, an anti-ultraviolet coating can be set outside the fuse 200 to delay the aging degree of the fuse 200.

[0088] Specifically, as Figure 4 and Figure 5 shown, the fuse 200 includes a fuse carrier tube 210, and the fuse carrier tube 210 includes an outer tube 211 made of epoxy glass composite and an inner tube 212 made of high-molecular material composite. The outer tube 211 is coaxially sleeved on the inner tube 212.

[0089] Among them, the outer tube 211 is designed with high-molecular composite tube material, and the non-alkali glass fiber yarn is impregnated with epoxy resin solution and wound and baked and cured along the axial inclination of 50-60°. The inner tube 212 should adopt high-quality composite materials with good arc extinguishing ability, such as high-molecular composite materials. So that during the working process, the strong current arc is not easy to continue burning, causing the further expansion of the transmission line accident.

[0090] like Figure 6 As shown, the fuse 200 further includes a fuse 230 disposed inside the fuse-carrying tube 210, and the fuse 230 includes a lead 231, an auxiliary arc-extinguishing tube 232, a fuse 233, a tension wire 234, and a connecting terminal 235. The lead 231 and the connecting terminal 235 are respectively inserted from both ends of the auxiliary arc-extinguishing tube 232, and the fuse 233 is located inside the auxiliary arc-extinguishing tube 232. The two ends of the fuse 233 are respectively connected to the lead 231 and the connecting terminal 235. The tension wire 234 is also connected to the lead 231 and the connecting terminal 235 to ensure the stability of the installation of the fuse 233.

[0091] like Figure 4 As shown, a heat-resistant layer 220 is provided at one end of the fuse 200 facing the first wiring member 110 , and the fuse 200 is in contact with the first wiring member 110 through the heat-resistant layer 220 .

[0092] The heat-resistant layer 220 may be silver-plated copper, which not only ensures the current capacity but also reduces the risk of high temperature or even ablation at the contacts due to high current operation during operation.

[0093] During implementation, the first terminal 110, the second terminal 120, the third terminal 130 and the pull ring 500 can be made of cast brass to have good current carrying capacity, or can be made of cast copper with better conductivity. The first post insulator 160, the second post insulator 170 and the outer jacket of the arrester 300 can be made of silicone rubber, and of course, can also be made of hard DMC material (i.e., unsaturated polyester resin) to have good water repellency and UV resistance.

[0094] In some embodiments, the upper end of the fuse 200 has an upper contact conductive sheet, and the lower end has a lower contact conductive sheet. Preferably, the copper content of the upper contact conductive sheet is not less than 95%, the Vickers hardness HV ≥ 120 and the thickness is not less than 2 mm; the lower contact conductive sheet should be made of T2 copper (i.e., high-purity copper) with a conductivity of not less than 98% IACS (i.e., the conductivity of the material is at least 98% of annealed copper) and a thickness of not less than 1 mm, wherein annealed copper is a pure copper material that has been annealed and has excellent electrical conductivity, and the conductivity is 100% IACS; the thickness of the conductive sheet in the second terminal 120 is not less than 2 mm. In addition, the contact portion of each conductive sheet is silver-plated, and the thickness of the silver plating is ≥ 3 μm.

[0095] In addition, it should be noted that, during implementation, each copper casting is required to be made of C95600 silicon aluminum bronze; each iron part should be hot-dip galvanized, with a uniform zinc layer and a thickness of ≥80μm, so as to have good electrical conductivity and current carrying capacity, and lasting corrosion resistance.

[0096] In summary, for the combined protection device for transmission lines provided in the embodiments of the present application, during installation, only the bracket 100 needs to be fixed, and then the first wiring component 110, the second wiring component 120, and the third wiring component 130 are connected to the transmission line, so that the fuse 200 and the lightning arrester 300 can be jointly connected to the transmission line. Compared with separately transporting and installing the fuse 200 and the lightning arrester 300, the transportation and installation steps are greatly saved, and the operation and maintenance costs are reduced.

[0097] During the working process, after the fuse 200 melts, the part of the fuse 200 connected to the second wiring component 120 will freely fall under its own gravity; when a short circuit occurs in the transmission line or the lightning arrester 300, the detachment component 400 automatically separates from the lightning arrester 300 to cut off the connection between the lightning arrester 300 and the transmission line. Then, the lightning arrester 300 will freely fall under its own gravity, which is convenient for the staff to timely detect abnormalities and maintain the fuse 200 and the lightning arrester 300, improving the use convenience and solving the problem of poor installation effect of the protection device in the prior art.

[0098] Finally, it should be noted that: after considering the specification and the invention disclosed herein, those skilled in the art will easily think of other implementation schemes of the present invention. The present invention aims to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the exact structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A combined protection device for a transmission line, characterized in that, Comprising: A bracket (100) having a first connection member (110), a second connection member (120), and a third connection member (130) for connecting power transmission lines respectively; A fuse (200) disposed on the bracket (100), one end of the fuse (200) being electrically connected to the first connection member (110) and the other end being electrically connected to the second connection member (120); A lightning arrester (300) disposed on the bracket (100), one end of the lightning arrester (300) being electrically connected to the first connection member (110) and the other end being electrically connected to the third connection member (130); The fuse (200) includes a fuse carrier tube (210) and a fuse element (230) disposed inside the fuse carrier tube (210). The fuse element (230) includes a lead wire (231), an auxiliary arc extinguishing tube (232), a fuse wire (233), a tension wire (234), and a connection terminal (235). The lead wire (231) and the connection terminal (235) respectively penetrate into both ends of the auxiliary arc extinguishing tube (232). The fuse wire (233) is located inside the auxiliary arc extinguishing tube (232), and both ends of the fuse wire (233) are respectively connected to the lead wire (231) and the connection terminal (235). The tension wire (234) is connected to the lead wire (231) and the connection terminal (235); The lightning arrester (300) has a core inside, and the core includes a resistor chip (320) and a glass fiber layer (310) covering the resistor chip (320); The bracket (100) includes a main frame (140) and a support plate (150) disposed on the top of the main frame (140). The first connection member (110) is disposed on the support plate (150), and the second connection member (120) and the third connection member (130) are disposed on the main frame (140); One end of the lightning arrester (300) is rotatably connected to the third connection member (130), and the other end is detachably connected to the support plate (150). The lightning arrester (300) is inclined; The lightning arrester (300) is provided with a disconnection component (400). The lightning arrester (300) is electrically connected to the third connection member (130) through the disconnection component (400). The disconnection component (400) is configured to automatically separate from the lightning arrester (300) when a short circuit occurs in the power transmission line to cut off the electrical connection between the lightning arrester (300) and the power transmission line. Subsequently, the lightning arrester (300) rotates away from the first connection member (110) under its own gravity; The disconnection component (400) includes a conductive support member (410) and a disconnector (420) connected to each other. The disconnector (420) is detachably disposed at one end of the lightning arrester (300) facing the third connection member (130). The lightning arrester (300) is electrically connected to the third connection member (130) through the conductive support member (410) and the disconnector (420).

2. The combined protection device for a transmission line according to claim 1, characterized in that, One end of the fuse (200) is rotatably connected to the second terminal member (120), and the other end is detachably connected to the support plate (150). The fuse (200) is inclined.

3. A combined protection device for a transmission line according to any one of claims 1-2, characterized in that, The bracket (100) further includes a plurality of post insulators. The post insulators are arranged on the main frame (140). The support plate (150) and / or the second terminal member (120) are connected to the main frame (140) through the post insulators.

4. A combined protection device for a transmission line according to any one of claims 1-2, characterized in that, The fuse (200) and the lightning arrester (300) are respectively located on opposite sides of the bracket (100).

5. A combined protection device for a transmission line according to any one of claims 1-2, characterized in that, A plurality of rain covers (600) are arranged on the bracket (100). The rain covers (600) cover above the fuse (200) or the lightning arrester (300).

6. A combined protection device for a transmission line according to any one of claims 1-2, characterized in that, The fuse carrier tube (210) includes an outer tube (211) made of epoxy glass composite and an inner tube (212) made of polymer material composite. The outer tube (211) is coaxially sleeved on the inner tube (212).

7. A combined protection device for a transmission line according to any one of claims 1-2, characterized in that, One end of the fuse (200) facing the first terminal member (110) is provided with a heat-resistant layer (220). The fuse (200) is in contact with the first terminal member (110) through the heat-resistant layer (220).

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