Lightning arrester broken line short circuit prevention device
By using a retractable rope assembly to tighten the connection of the down conductor in the surge arrester breakage short-circuit protection device, the short-circuit problem caused by the swinging of the down conductor after the surge arrester melts is solved, thus improving the safety and reliability of power lines.
Patent Information
- Application Number
- CN202510891688.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-11-07
AI Technical Summary
After the down conductor of a surge arrester melts, it is prone to swaying due to wind, which can lead to single-phase or phase-to-phase short circuits and affect the safety of power lines.
A surge arrester breakage protection device is adopted, which includes the surge arrester body, down conductor, insulating support and retraction rope assembly. When the down conductor breaks, the retraction rope assembly retracts and tightens the connection part to limit its swing and prevent it from contacting the tower assembly.
It reduces the risk of single-phase or phase-to-phase short circuits and improves the safety and reliability of power lines.
Smart Images
Figure CN120914726A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lightning arrester safety, and in particular to a lightning arrester broken wire anti-short circuit device. BACKGROUND
[0002] In the power scenario, lightning arresters are usually used to resist lightning overvoltage or protect power system operating overvoltage. Due to the limitations of existing processes, part of the downlead of the lightning arrester is prone to be fused due to overcurrent and flashover, and the fused downlead is prone to swing and contact other charged parts or grounding under the blowing of the wind, thereby possibly causing single-phase or inter-phase short circuit and affecting the safety of the power line. SUMMARY
[0003] The present application provides a lightning arrester broken wire anti-short circuit device to solve the problem that the downlead of the lightning arrester is prone to cause single-phase or inter-phase short circuit after being fused.
[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:
[0005] The present application provides a lightning arrester broken wire anti-short circuit device, which comprises: a lightning arrester, the lightning arrester comprising a lightning arrester body and a downlead, the lightning arrester body being installed on a tower assembly, the upper end of the downlead being connected with a charged wire, and the lower end of the downlead being connected with the lightning arrester body; an insulating support, the insulating support being installed on the tower assembly, and the insulating support being arranged at a distance from the lightning arrester; and a contraction rope assembly, the contraction rope assembly being connected between the insulating support and the downlead; the contraction rope assembly being contracted when the downlead is broken, so as to tighten the connection part of the downlead, thereby avoiding the charged part of the downlead from contacting the tower assembly.
[0006] As an optional implementation, the tower assembly comprises a tower and a cross arm connected to the tower, and the lightning arrester and the insulating support are both installed on the cross arm, and the insulating support is located on the side of the lightning arrester away from the tower.
[0007] As an optional implementation, at least one contraction rope assembly is connected to the downlead along the extension direction, and the downlead has at least one connection point of the contraction rope assembly; the line length from the connection point closest to the charged wire to the upper end of the downlead is less than the distance between the charged wire and the tower.
[0008] As an optional implementation, the contraction rope assembly extends upwardly and obliquely from one end connected with the downlead to the other end connected with the insulating support.
[0009] As an optional implementation, at least three contraction rope assemblies are connected to the downlead along the extension direction, and the downlead has at least three connection points of the contraction rope assemblies.
[0010] As an optional implementation, the lengths of the down conductor between adjacent connection points are equal along the extension direction of the down conductor.
[0011] As an optional implementation, the insulating support comprises: a fixing base connected to the tower component; and an insulating rod connected to the top of the fixing base and extending in the vertical direction; wherein the shrinkable rope assembly is connected to the insulating rod.
[0012] As an optional implementation, at least two shrinkable rope assemblies are connected to the insulating rod along the extension direction of the insulating rod, the uppermost shrinkable rope assembly is connected to the top end of the insulating rod, and each shrinkable rope assembly equally divides the insulating rod at the connection position of the insulating rod.
[0013] As an optional implementation, the shrinkable rope assembly comprises: a shrinkable rope, one end of the shrinkable rope being connected to the down conductor and the other end of the shrinkable rope being connected to the insulating support; a force gauge, the force gauge being installed on the shrinkable rope and measuring the tension of the shrinkable rope; and a shrinker, the shrinker being connected to the shrinkable rope and tightening the shrinkable rope when the tension variation of the shrinkable rope exceeds a preset threshold.
[0014] As an optional implementation, the shrinkable rope assembly comprises an elastic rope, the elastic rope being connected between the down conductor and the insulating support, and the elastic rope being in a stretched state when the down conductor is not broken.
[0015] As an optional implementation, the device further comprises an alarm, the alarm being connected to the insulating support and emitting an audible and visual alarm when the down conductor is broken.
[0016] The lightning arrester broken line anti-short circuit device provided by the present application comprises a lightning arrester, an insulating support, and a shrinkable rope assembly. The lightning arrester comprises a lightning arrester body and a down conductor, the lightning arrester body being installed on a tower component, the upper end of the down conductor being connected to a live wire, and the lower end of the down conductor being connected to the lightning arrester body. The insulating support is installed on the tower component and is spaced apart from the lightning arrester. The shrinkable rope assembly is connected between the insulating support and the down conductor. When the down conductor is broken, the shrinkable rope assembly can be shrunk to tighten the connection position of the down conductor, so as to prevent the live part of the down conductor from contacting the tower component.
[0017] In this way, since the shrinkable rope assembly is connected between the insulating support and the down conductor, when the down conductor of the lightning arrester is broken, the shrinkable rope assembly can be shrunk to tighten the connection position of the down conductor, so as to limit the swing of the down conductor and prevent the live part of the down conductor from contacting the tower component, thereby reducing the risk of single-phase or inter-phase short circuit and improving the safety of the power line. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0019] Figure 1 A structure schematic diagram of a lightning arrester broken wire anti-short circuit device provided by the embodiment of the present application is shown in the figure.
[0020] Figure 2 A structure schematic diagram of another lightning arrester broken wire anti-short circuit device provided by the embodiment of the present application is shown in the figure.
[0021] Figure 3 A component schematic diagram of a shrinkable rope assembly provided by the embodiment of the present application is shown in the figure.
[0022] Explanation of reference signs:
[0023] 100-insulating support; 110-fixing seat; 120-insulating rod;
[0024] 200-shrinkable rope assembly; 210-shrinkable rope; 220-force gauge; 230-shrinker;
[0025] 300-lightning arrester; 310-down conductor; 320-lightning arrester body; 321-connection end;
[0026] 400-tower assembly; 410-tower; 420-cross arm;
[0027] 500-charged wire. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0029] In the prior art, lightning arresters are usually used to resist lightning overvoltage or protect power system operating overvoltage. However, in the actual use process, part of the down conductors of lightning arresters are prone to be fused due to overcurrent and flashover, etc., in which:
[0030] (1) Overcurrent: When the lightning stroke or the transient overvoltage generated by system operation exceeds the rated withstand level of the lightning arrester, the down conductor needs to discharge tens of thousands of amperes of lightning current, and the instantaneous heat accumulation can cause the down conductor to melt and break.
[0031] (2) Flashover: 1. After the down conductor insulating layer is contaminated or soaked, the surface leakage current increases, partial discharge forms an arc, the temperature can reach above 3000℃, and the down conductor metal is directly ablated. 2. When the grounding resistance is too high, the lightning current cannot be discharged smoothly, a potential difference is generated between the down conductor and the grounding body, a through electric arc discharge is formed, and the down conductor is instantaneously melted.
[0032] When the down conductor of the lightning arrester is melted, the part of the down conductor connected with the conducting wire is in a charged state. The charged part of the down conductor swings around under the blowing of the wind, and can contact other charged parts or grounding parts, such as the tower assembly, the cross arm and other charged equipment arranged on the tower assembly or the cross arm. Thus, single-phase or inter-phase short circuit can be caused, and the safety of the power line is affected.
[0033] Therefore, the application provides a lightning arrester broken wire anti-short circuit device.
[0034] Thus, the lightning arrester broken wire anti-short circuit device is provided.
[0035] The content of the application will be described in detail below with reference to the drawings, so that those skilled in the art can more clearly and specifically understand the content of the application.
[0036] Figure 1 The lightning arrester broken wire anti-short circuit device provided by the application has the advantages of simple structure, convenient use, low cost, and the like. Figure 2 The lightning arrester broken wire anti-short circuit device provided by the application has the advantages of simple structure, convenient use, low cost, and the like. Figure 1 Or Figure 2 As shown in FIGS. 1 to 3, the lightning arrester broken wire anti-short circuit device provided by the application includes a lightning arrester 300, an insulating support 100 and a shrinkable rope assembly 200.
[0037] The lightning arrester 300 can include a lightning arrester body 320 and a down conductor 310. The lightning arrester body 320 is installed on the tower assembly 400, and the lightning arrester body 320 can introduce the overcurrent caused by lightning or system operation into the ground. For example, the lightning arrester body 320 can be composed of zinc oxide varistors, which have a non-linear voltage-current characteristic, are in a high resistance state under normal voltage, are rapidly turned on to achieve current discharge under overvoltage, and are provided with a grounding end, which can be connected to the grounding grid to introduce the current into the ground. The upper end of the down conductor 310 can be connected to the live wire 500, and the lower end of the down conductor 310 is connected to the lightning arrester body 320, so that the lightning arrester body 320 is integrated into the line. It can be understood that the tower assembly 400 refers to a structure for erecting a power line and providing support and connection for other components provided on the power line.
[0038] The insulating support 100 can be installed on the tower assembly 400, and the insulating support 100 can be spaced apart from the lightning arrester 300, so that there is a certain space between the lightning arrester 300 and the insulating support 100. The shrinkable rope assembly 200 is connected between the insulating support 100 and the down conductor 310. Moreover, the shrinkable rope assembly 200 can be contracted when the down conductor 310 is broken, so that the connection part of the shrinkable rope assembly 200 and the down conductor 310 can be pulled tight to avoid the live part of the down conductor 310 from contacting the tower assembly 400.
[0039] By introducing the shrinkable rope assembly 200 between the insulating support 100 and the down conductor 310, when the down conductor 310 in the lightning arrester 300 is broken, the connection part of the shrinkable rope assembly 200 and the down conductor 310 can be contracted and pulled tight to limit the swing of the down conductor 310, so that the live part of the down conductor 310 is less likely to contact the tower assembly 400, thereby reducing the risk of single-phase or inter-phase short circuit and improving the safety of the power line.
[0040] It can be understood that if the part of the down conductor 310 connected by the shrinkable rope assembly 200 is not the live part of the down conductor 310, that is, the breakpoint is in the interval from the connection part of the shrinkable rope assembly 200 and the down conductor 310 to the upper end of the down conductor 310. At this time, the connection point between the shrinkable rope assembly 200 and the down conductor 310 can be reasonably selected to reduce the probability of the live part of the down conductor 310 contacting the tower assembly 400.
[0041] For example, the connection point between the shrinkable rope assembly 200 and the down conductor 310 can be arranged as close to the end where the live wire 500 is located as possible, so that the probability of the breaking point occurring in the section from the connection between the shrinkable rope assembly 200 and the down conductor 310 to the upper end of the down conductor 310 is reduced, and even if a fuse occurs between them, it is difficult to contact the tower assembly 400 at a distance from the live wire 500 due to the short length of the section of the down conductor 310, thereby ensuring the safety thereof.
[0042] For example, the tower assembly 400 can include a tower 410 and a cross arm 420 connected to the tower 410. The live wire 500 is arranged on the tower 410. The lightning arrester 300 and the insulating support 100 are both mounted on the cross arm 420, and the insulating support 100 can be located on the side of the lightning arrester 300 away from the tower 410.
[0043] In this way, when the shrinkable rope assembly 200 is contracted and tightened at the connection between the shrinkable rope assembly 200 and the down conductor 310, since the insulating support 100 is located on the side of the lightning arrester 300 away from the tower 410, the contraction of the shrinkable rope assembly 200 also causes the live part of the down conductor 310 to move away from the tower 410, thereby further reducing the risk of the live part of the down conductor 310 contacting the tower 410.
[0044] The following is described with the insulating support 100 located on the side of the lightning arrester 300 away from the tower 410 as an example.
[0045] To further improve the reliability of the device, at least one shrinkable rope assembly 200 can be connected to the down conductor 310 along the extension direction, and correspondingly, the down conductor 310 has at least one connection point of the shrinkable rope assembly 200. For example, when one shrinkable rope assembly 200 is connected to the down conductor 310, the down conductor 310 has one connection point of the shrinkable rope assembly 200. When two shrinkable rope assemblies 200 are connected to the down conductor 310 along the extension direction, the down conductor 310 has two connection points of the shrinkable rope assemblies 200. When three shrinkable rope assemblies 200 are connected to the down conductor 310 along the extension direction, the down conductor 310 has three connection points of the shrinkable rope assemblies 200, and the same principle can be applied to other numbers of shrinkable rope assemblies 200.
[0046] The line length from the connection point closest to the live wire 500 to the upper end of the down conductor 310 is less than the distance between the live wire 500 and the tower 410.
[0047] In this way, when the breaking point occurs between the connection point closest to the live wire 500 and the lower end of the down conductor 310, the connection between the shrinkable rope assembly 200 connected to the down conductor 310 and the down conductor 310 can be tightened to avoid the live part of the down conductor 310 contacting the tower assembly 400.
[0048] When the break point is between the connection point closest to the live wire 500 and the upper end of the down conductor 310, the length of the line between the connection point closest to the live wire 500 and the upper end of the down conductor 310 is less than the distance between the live wire 500 and the tower 410. Even if this part can swing after the fuse is blown, the trajectory of the charged part of the down conductor 310 can be a circular trajectory with the upper end of the down conductor 310 (the connection point of the live wire 500 and the down conductor 310) as the center, and the length of the break point to the upper end of the down conductor 310 as the radius. Even if the charged part of the down conductor 310 swings to the farthest distance, it cannot contact the tower 410, thereby further ensuring that the charged part of the down conductor 310 cannot contact the tower 410 no matter where the break point is located, and improving the reliability of the reinforcing device.
[0049] The following is further described by taking the length of the line between the connection point closest to the live wire 500 and the upper end of the down conductor 310 as an example, which is less than the distance between the live wire 500 and the tower 410.
[0050] In some embodiments, the contraction rope assembly 200 can extend obliquely upward from one end connected to the down conductor 310 to the other end connected to the insulating support 100.
[0051] Since the insulating support 100 and the lightning arrester 300 are installed on the same side of the cross arm 420, the part of the down conductor 310 still connected to the contraction rope assembly 200 can be pulled tight by the contraction rope assembly 200 to the side away from the cross arm 420 after the down conductor 310 is broken, thereby reducing the risk of short circuit caused by the charged part of the down conductor 310 contacting the cross arm 420.
[0052] As an implementation, at least three contraction rope assemblies 200 can be connected to the down conductor 310 in the extension direction, and the down conductor 310 has at least three connection points of the contraction rope assemblies 200. For example, when three contraction rope assemblies 200 are connected to the down conductor 310 in the extension direction, the down conductor 310 has three connection points of the contraction rope assemblies 200. When four contraction rope assemblies 200 are connected to the down conductor 310 in the extension direction, the down conductor 310 has four connection points of the contraction rope assemblies 200. Other quantities can be analogously extended.
[0053] By arranging at least three contraction rope assemblies 200 between the insulating support 100 and the down conductor 310, the down conductor 310 can be divided into multiple segments with shorter lengths, thereby improving the probability that the charged part of the down conductor 310 remains connected to the contraction rope assembly 200 when broken, so that the contraction rope assembly 200 can pull the down conductor 310 away from the tower 410 and the cross arm 420.
[0054] And, since when the down conductor 310 is longer, such as only connected with one shrinkable rope assembly 200, since the line length from the connection point to the upper end of the down conductor 310 needs to be ensured to be less than the distance between the live wire 500 and the tower 410, at this time, although the connection part of the shrinkable rope assembly 200 and the down conductor 310 can be pulled tight, when the breaking point is close to the lower end of the down conductor 310, the section from the connection point to the breaking point still has a certain swing space, at this time, if the section swings back, it may cause the live part of the down conductor 310 to contact the tower assembly 400.
[0055] The three-section design is more suitable for the application scenario where the down conductor 310 is longer, reduces the risk that the movable section of the live part swings back to contact the tower assembly 400, further improves the reliability of the overall device, and further makes the power grid system more secure.
[0056] It can be understood that the more the number of shrinkable rope assemblies 200 between the insulating support 100 and the down conductor 310, the higher the reliability of the device, but the economic cost is also higher, and in actual use, the number of shrinkable rope assemblies 200 can be selected according to specific needs, and the number of shrinkable rope assemblies 200 is not further limited here.
[0057] As an implementation manner, the line length between adjacent connection points in the extension direction of the down conductor 310 can be equal. That is to say, when there are three or more connection points in the extension direction of the down conductor 310, the line length between adjacent connection points can be equal.
[0058] It can be understood that the line length from the connection point closest to the lightning arrester body 320 to the lower end of the down conductor 310 is not limited here. As long as the line length from the connection point closest to the live wire 500 to the upper end of the down conductor 310 is less than the distance between the live wire 500 and the tower 410, the line length from the connection point closest to the lightning arrester body 320 to the lower end of the down conductor 310 can be determined according to the overall length of the down conductor 310 and the reasonable spacing between the shrinkable rope assemblies 200,
[0059] For example, taking the case where there are three connection points in the extension direction of the down conductor 310, on the basis of satisfying that the line length from the connection point closest to the live wire 500 to the upper end of the down conductor 310 is less than the distance between the live wire 500 and the tower 410, the remaining part can be divided into three equal parts, so that the line length between adjacent connection points and the line length from the connection point closest to the lightning arrester body 320 to the lower end of the down conductor 310 are all equal. At this time, the shrinkable rope assemblies 200 are more evenly and aesthetically distributed in the down conductor 310. And, the equal length design also facilitates the setting of the connection marker points.
[0060] The line length between adjacent connection points and the line length from the connection point closest to the lightning arrester body 320 to the lower end of the down conductor 310 can also be unequal, which can make the setting of the connection point position more flexible.
[0061] With continued reference to Figure 1 Or Figure 2 As shown in FIG. 1, the insulating support 100 can include a fixed seat 110 and an insulating rod 120. The fixed seat 110 is connected to the tower assembly 400. The insulating rod 120 is connected to the top of the fixed seat 110, and the insulating rod 120 can extend in the vertical direction. The retraction rope assembly 200 is connected to the insulating rod 120.
[0062] The fixed seat 110 is fixed to one side of the cross arm 420, and the fixed seat 110 can be provided as an insulating porcelain insulator. One end of the insulating rod 120 is connected to the fixed seat 110 away from the side of the cross arm 420, and the other end extends in the vertical direction.
[0063] For example, at least two retraction rope assemblies 200 can be connected along the extension direction of the insulating rod 120, the uppermost retraction rope assembly 200 can be connected to the top end of the insulating rod 120, and each retraction rope assembly 200 can divide the insulating rod 120 into equal parts.
[0064] For example, two retraction rope assemblies 200 are connected along the extension direction of the insulating rod 120, one of the retraction rope assemblies 200 is connected to the top end of the insulating rod 120, and the other retraction rope assembly 200 can be connected to the midpoint of the insulating rod 120.
[0065] For example, three retraction rope assemblies 200 are connected along the extension direction of the insulating rod 120, one of the retraction rope assemblies 200 is connected to the top end of the insulating rod 120, and the remaining two retraction rope assemblies 200 can be connected to the three-equal points of the insulating rod 120.
[0066] In this way, the stress on the insulating rod 120 is more uniform, and when the lightning arrester down conductor 310 suddenly breaks, the insulating rod 120 will not vibrate due to the retraction of the retraction rope assembly 200, thereby improving the safety of the device.
[0067] The retraction rope assembly 200 provided by the embodiments of the present application will be described in detail below.
[0068] Figure 3 A schematic diagram of the composition of a retraction rope assembly provided by the embodiments of the present application is shown. As shown in FIG. 2, Figure 2 and Figure 3 As shown in FIG. 2, the retraction rope assembly 200 can include a retraction rope 210, a force gauge 220, and a retractor 230. One end of the retraction rope 210 is connected to the down conductor 310, and the other end of the retraction rope 210 is connected to the insulating support 100. Specifically, the retraction rope 210 can be made of rubber.
[0069] The force gauge 220 is installed on the shrinkable rope 210, and the force gauge 220 can measure the tension of the shrinkable rope 210. The shrinker 230 is connected to the shrinkable rope 210, and the shrinker 230 tightens the shrinkable rope 210 when the tension variation of the shrinkable rope 210 exceeds a preset threshold.
[0070] In this way, the detection of the tension variation of the shrinkable rope 210 by the force gauge 220 can timely find out whether the down wire 310 of the lightning arrester 300 is broken, and when the tension variation of the shrinkable rope 210 exceeds the preset threshold, the shrinker 230 in the shrinkable rope assembly 200 can be started to drive the shrinkable rope 210 to retract, so as to tighten the down wire 310.
[0071] It can be understood that the shrinker 230 can include a box body, a rotating shaft, and a coil spring. The shrinkable rope 210 is partially outside the box body and partially accommodated in the box body. The rotating shaft is arranged in the box body and can rotate relative to the box body. Part of the shrinkable rope 210 is wound on the rotating shaft. The coil spring is connected between the box body and the rotating shaft to drive the shrinkable rope 210 to retract relative to the box body.
[0072] The shrinker 230 can further include a locking portion and an unlocking portion. The locking portion can limit the rotation of the rotating shaft relative to the box body. That is, the length of the shrinkable rope 210 can be fixed by the locking portion in the initial connection state.
[0073] The unlocking portion can be configured to release the locking of the locking portion when the tension variation of the shrinkable rope 210 exceeds a preset threshold, so that the rotating shaft can rotate relative to the box body and retract under the action of the coil spring. Since the working principle is similar to that of the existing wire reel, it will not be described here.
[0074] In another embodiment, the shrinkable rope assembly 200 can also include an elastic rope connected between the down wire 310 and the insulating support 100, and the elastic rope is in a stretched state when the down wire 310 is not broken. Specifically, the elastic rope can be connected between the down wire 310 and the insulating rod 120. At this time, since the elastic rope is in a stretched state, a certain elastic potential is accumulated inside the elastic rope. When the down wire 310 is melted, the elastic potential is released, so that the down wire 310 can be retracted to one side of the insulating support 100 and tightened to avoid the electrified part of the down wire 310 from contacting the tower assembly 400.
[0075] Further, the elastic rope can be detachably connected to the down wire 310 and the insulating support 100 through a hook, so that when the elastic rope is worn or aged, the elastic rope can be replaced in time to ensure the reliability of the device. Specifically, the hook can be a composite gum ring.
[0076] In one implementation, the surge arrester short-circuit protection device may also include an alarm and a controller. Both the controller and the alarm can be connected to the insulating support 100. The alarm can issue an audible and visual alarm when the down conductor 310 breaks to indicate a fuse failure. The alarm can also send a signal to the control center to remind relevant personnel to replace the relevant parts in a timely manner.
[0077] The controller can receive the tension signal sent by the force sensor 220 and determine whether the change in tension of the retraction rope 210 exceeds a preset threshold. If the change in tension of the retraction rope 210 exceeds the preset threshold, the controller can send an execution signal to the retractor 230 to retract and tighten the connection of the down conductor 310 when the down conductor 310 breaks, thus preventing the live parts of the down conductor 310 from contacting the tower assembly 400. Furthermore, the controller can send an alarm signal to the alarm system to alert relevant personnel.
[0078] Considering that this device is set up outdoors, the detection results of the force measuring device 220 may be affected by the contact or landing of birds, which may erroneously trigger the operation of the retractable rope assembly 200. In order to further improve the control reliability of the controller, when the tension change of the retractable rope 210 is detected to exceed the preset threshold for the first time, the tension change can be re-determined within a preset time period. If it still exceeds the preset threshold, a relevant signal can be sent to drive the retractable rope assembly 200 to operate.
[0079] When there are multiple retraction rope assemblies 200, multiple force gauges 220 can also be used to check whether multiple force gauges 220 simultaneously detect that the change in tension exceeds the preset threshold, thereby increasing the accuracy of the signal.
[0080] It should be noted that, since the down conductor 310 is firmly welded, even if the device is accidentally triggered, it will not affect the down conductor 310. The retraction rope 210 will not break the down conductor 310. The retraction rope 210 can be reset when the line is shut down for maintenance.
[0081] The following is Figure 1 Taking this as an example, a detailed explanation of a surge arrester short-circuit protection device with only one retraction rope assembly 200 will be provided. It should be noted that... Figure 1 and Figure 2 Point M in the diagram is the intersection of the center of the live wire 500 with the tower 410 when projected vertically from the tower 410. Point E is the connection point between the down conductor 310 and the surge arrester body 320. Point J is the connection point between the insulating rod 120 and the fixing base 110.
[0082] like Figure 1As shown, the live wire 500 is installed at point A. The surge arrester 300 is mounted on the tower assembly 400 via the surge arrester body 320. The lower end of the down conductor 310 is connected to the surge arrester body 320 via the connecting end 321 of the surge arrester body 320, and the upper end of the down conductor 310 is connected to the live wire 500. A retractable rope assembly 200 is connected between the insulating support 100 and the down conductor 310. The connection point between the retractable rope assembly 200 and the down conductor 310 is point B, and the connection point between the retractable rope assembly 200 and the insulating support 100 is point G.
[0083] Assuming the break occurs between B and E, since the only energized part of the down conductor 310 after the fuse breaks is connected to the live wire 500, and point B is located between end A and the break, the retractable rope assembly 200 will retract towards the side where the insulating support 100 is located, and along the connection between the down conductor 310 and the retractable rope assembly 200, that is... Figure 1 At point B, tighten the energized part of the down conductor 310 to restrict the movement of the energized part of the down conductor 310 and reduce its possible swing amplitude.
[0084] Assuming the break occurs between A and B, the distance between AM and AM can be considered as the distance between the live wire 500 and the tower 410. Point B is the connection point on the down conductor 310 with the retraction rope assembly 200, and at this point, point B is the connection point closest to the live wire 500. The length of this section of the down conductor 310 is AB. AM can be made longer than the length of AB, thereby further ensuring that the live part of the down conductor 310 does not come into contact with the tower 410.
[0085] Understandably, when the break occurs at point X between A and B, the portion of the down conductor 310 from the break to point A where the live wire 500 is located is segment AX. At this time, the tensioning rope assembly 200 tightens the segment from the break to point E, where the down conductor 310 connects to the surge arrester body 320; this segment itself is not energized. The energized portion of the down conductor 310 is segment AX. Since the break is between A and B, the length of segment AX is less than the length of segment AB. When segment AB is shorter than segment AM, segment AX is also necessarily shorter than segment AM. Therefore, even if the down conductor 310 melts within this range, the energized portion of the down conductor 310 may sway with the wind, but since its swaying trajectory is a circular trajectory centered at A with radius AX, and AX is shorter than AM, even if the energized portion of the down conductor 310 swings to its furthest distance, it cannot contact the tower 410. This further ensures that regardless of where the break is located, the energized portion of the down conductor 310 will not contact the tower 410, improving the reliability of the reinforcement device.
[0086] The following is Figure 2 For example, a detailed description is given of a surge arrester short-circuit protection device with three retractable rope assemblies 200.
[0087] Referring to Figure 2 As shown, three shrink rope assemblies 200 are connected to the down conductor 310 along the extension direction, the live wire 500 is arranged at A, the lightning arrester 300 is installed on the tower assembly 400 through the lightning arrester body 320, the lower end of the down conductor 310 is connected to the lightning arrester body 320 through the connecting end 321 of the lightning arrester body 320, and the upper end of the down conductor 310 is connected to the live wire 500. Three shrink rope assemblies 200 are connected between the insulating support 100 and the down conductor 310, and the connection points of the shrink rope assemblies 200 and the down conductor 310 from the upper end to the lower end along the extension direction of the down conductor 310 are B, C and D points. Correspondingly, the connection points of the other end of the down conductor 310 and the insulating rod 120 are G, H and I points.
[0088] Suppose the breaking point occurs between DE, at this time, the live part of the down conductor 310 is the part from the upper end of the down conductor 310 to the breaking point, and the three shrink rope assemblies BG, CH and DI arranged on the insulating rod 120 will all tighten the live part along the connection part between the insulating rod 120 and the down conductor 310, so as to sufficiently limit the movement of the live part.
[0089] Suppose the breaking point occurs between CD, at this time, the live part of the down conductor 310 can be tightened by two shrink rope assemblies BG and CH, and away from the tower 410 and the cross arm 420. And since the live part of the down conductor 310 is tightened by two shrink rope assemblies 200 at this time, the movable range of the live part of the down conductor 310 is limited, which is equivalent to only the part between C point and the breaking point can swing with the wind, and when the shrink rope assembly 200 is tightened, the down conductor 310 will be pulled away from the tower 410. Therefore, even considering the possibility of the part swinging back under the action of the wind, the live part of the down conductor 310 will not contact the tower 410. In addition, the non-live part of the down conductor 310 can also be tightened by the shrink rope assembly DI, so as to make it not swing with the wind, keeping the power line neat and tidy.
[0090] Suppose the breaking point occurs between BC, at this time, the live part of the down conductor 310 can be tightened by one shrink rope assembly BG, and away from the tower 410 and the cross arm 420. At this time, only the part between B point and the breaking point in the live part of the down conductor 310 can swing with the wind, and even if the part swings back, it will not contact the tower 410. And the non-live part of the down conductor 310 can also be tightened by the shrink rope assemblies CH and DI.
[0091] When the break point is between AB, since the connection part of B point can be specially designed, AB is less than AM, even if the live part of down conductor 310 cannot be pulled tight by the contraction rope assembly 200, the live part of down conductor 310 will not contact the tower 410 and cross arm 420, the principle is the same as the lightning arrester broken wire short circuit prevention device provided with only one contraction rope assembly 200, which will not be described here.
[0092] Figure 2 In the embodiment, the line length of BC can be equal to the line length of CD. On the basis that the line length of AB satisfies AB is less than AM, the remaining part can also be divided into three equal parts, so that the line lengths of BC, CD and DE are equal, so as to facilitate the installation and connection of the contraction rope assembly 200.
[0093] The connection points of the insulating rod 120 and the contraction rope assembly 200 are I, H and G from the lower end to the upper end of the insulating rod 120. Among them, the G point is arranged at the top end of the insulating rod 120. The connection points G, H and I can divide the insulating rod 120 into three equal parts, so that GH = HI = IJ. In this way, the stress on the insulating rod 120 is more uniform, and when the down conductor 310 of the lightning arrester suddenly breaks, the insulating rod 120 will not vibrate due to the retraction of the contraction rope assembly 200, thereby improving the safety of the device.
[0094] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification mean that the described embodiment can include a particular feature, structure or characteristic, but not necessarily every embodiment. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in connection with other embodiments described explicitly or implicitly.
[0095] Generally, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic of singular meaning, or can be used to describe the combination of features, structures or characteristics of plural meaning. Similarly, at least partly according to the context, terms such as "a" or "said" can be understood as conveying singular usage or conveying plural usage.
[0096] It should be readily understood that "on," "over," and "above" in the present application are to be interpreted in the broadest context, such that "on" means not only "directly on" but also includes the meaning of "on" with intervening features or layers therebetween, and "over" or "above" includes not only the meaning of "over" or "above" but also the meaning of "over" or "above" with no intervening features or layers therebetween (i.e., directly on).
[0097] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0098] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application; even though the present application has been described in detail with reference to the above-described embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above-described embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A surge arrester disconnection short-circuit protection device, characterized in that, The utility model relates to a lightning arrester and a lightning arrester fixing device, and relates to the technical field of lightning protection. The lightning arrester comprises a lightning arrester body and a down conductor, the lightning arrester body is installed on a tower assembly, and the upper end of the down conductor is connected to a live wire, and the lower end of the down conductor is connected to the lightning arrester body. The insulating support is installed on the tower assembly and is arranged at a distance from the lightning arrester. The contraction rope assembly is connected between the insulating support and the down conductor, and the contraction rope assembly contracts when the down conductor is broken, thereby tightening the connection part of the down conductor to prevent the live part of the down conductor from contacting the tower assembly.
2. The line break prevention and short circuit prevention device for a surge arrester according to claim 1, characterized by The tower assembly comprises a tower and a cross arm connected to the tower, and the lightning arrester and the insulating support are both installed on the cross arm, and the insulating support is located on the side of the lightning arrester that faces away from the tower.
3. The line break prevention and short circuit prevention device for a surge arrester according to claim 2, characterized by At least one contraction rope assembly is connected to the down conductor along the extension direction of the down conductor, and the down conductor has at least one connection point of the contraction rope assembly. The line length from the connection point closest to the live wire to the upper end of the down conductor is less than the distance between the live wire and the tower.
4. The device according to any of claims 1 to 3, characterized in that From the end of the contraction rope assembly connected to the down conductor to the end of the contraction rope assembly connected to the insulating support, the contraction rope assembly extends upward at an angle.
5. The device according to any of claims 1 to 3, characterized in that At least three contraction rope assemblies are connected to the down conductor along the extension direction of the down conductor, and the down conductor has at least three connection points of the contraction rope assemblies.
6. The line-break prevention short-circuiting device for a surge arrester according to Claim 5, wherein Along the extension direction of the down conductor, the line lengths between adjacent connection points are equal.
7. The device according to any of claims 1 to 3, characterized in that The insulating support comprises: a fixing seat connected to the tower assembly; an insulating rod connected to the top of the fixing seat and extending in the vertical direction; wherein the contraction rope assembly is connected to the insulating rod.
8. The line break prevention and short circuit prevention device for a surge arrester according to claim 7, characterized by At least two contraction rope assemblies are connected to the insulating rod along the extension direction of the insulating rod, the uppermost contraction rope assembly is connected to the top end of the insulating rod, and each contraction rope assembly equally divides the insulating rod at the connection point on the insulating rod.
9. The device according to any of claims 1 to 3, characterized in that The contraction rope assembly comprises: a contraction rope, one end of which is connected to the down conductor, and the other end of which is connected to the insulating support; a force gauge installed on the contraction rope, which measures the tension of the contraction rope; a contraction device connected to the contraction rope, which tightens the contraction rope when the tension variation of the contraction rope exceeds a preset threshold.
10. The device according to any of claims 1 to 3, characterized in that The contraction rope assembly comprises a spring rope connected between the down conductor and the insulating support, and the spring rope is in a stretched state when the down conductor is not broken.
11. The device according to any of claims 1 to 3, characterized in that The utility model also comprises: an alarm connected to the insulating support, which gives an audible and visual alarm when the down conductor is broken.