CN117133519A - Lightning arrester and power transmission tower - Google Patents

Abstract

The application discloses a lightning arrester, which comprises a hollow pipe, a core rod, a lightning arrester core body and a connecting fitting, wherein the hollow pipe is axially arranged to be of a hollow structure; the core rod is arranged in the hollow pipe and the extending direction is the same as the extending direction of the hollow pipe; the lightning arrester core body is positioned in the hollow tube and sleeved on the periphery of the core rod; the both ends of plug all are connected with link fitting, and link fitting and arrester core electricity are connected, and link fitting does not extend to the outside of hollow tube with the one end that the plug is connected and form the tip of arrester. The core rod is arranged in the lightning arrester, so that the lightning arrester is supported, the overall strength of the lightning arrester can be ensured, and the service life of the lightning arrester is prolonged. The application also discloses a power transmission tower, which is provided with the lightning arrester, so that the service life of the power transmission tower can be ensured.

Description

Lightning arrester and power transmission tower

Technical Field

The application relates to the technical field of power transmission, in particular to a lightning arrester and a power transmission tower.

Background

In order to improve the lightning protection performance of the power transmission tower, a lightning arrester is usually required to be installed on the power transmission tower, the traditional lightning arrester comprises a zinc oxide resistor sheet and an insulator for accommodating the zinc oxide resistor sheet, a certain mechanical load is usually required to be born on the power transmission tower, fatigue damage is easy to cause, and accordingly the service life of the lightning arrester is shortened.

Disclosure of Invention

The application provides a lightning arrester, wherein a core rod is arranged inside the lightning arrester, so that the lightning arrester is supported, the overall strength of the lightning arrester can be ensured, and the service life of the lightning arrester is prolonged.

In order to achieve the above purpose, the technical means adopted by the application are as follows: a lightning arrester, comprising: the hollow pipe is axially arranged to be of a hollow structure; the core rod is arranged in the hollow pipe and has the same extending direction as the hollow pipe; the lightning arrester core body is positioned in the hollow tube and sleeved on the periphery of the core rod; the connecting fitting is connected with the two ends of the core rod, the connecting fitting is electrically connected with the lightning arrester core body, and one end, which is not connected with the core rod, of the connecting fitting extends to the outside of the hollow tube to form the end part of the lightning arrester.

Wherein, the arrester further includes: the clamping blocks are arranged in the hollow tube and sleeved on the periphery of the core rod, the clamping blocks are respectively arranged on two sides of the lightning arrester core body to clamp the lightning arrester core body, the clamping blocks are electrically connected with the lightning arrester core body, and the clamping blocks are respectively electrically connected with adjacent connecting fittings.

The connecting fitting is arranged at one end of the hollow tube, a slot is formed in one end of the connecting fitting, one end of the core rod is inserted into the slot, and the clamping blocks adjacent to the connecting fitting are sleeved on the periphery of the connecting fitting and the periphery of the core rod at the same time.

The lightning arrester further comprises two end flanges, wherein the two end flanges are respectively sleeved on the periphery of the two connecting fittings and cover the two ends of the hollow tube respectively, and the parts of the end flanges extend into the hollow tube.

The lightning arrester further comprises conductive springs, each conductive spring is supported between each end flange and the adjacent clamping block, and each end flange is electrically connected with the adjacent clamping block through the conductive spring.

The connecting fitting is characterized in that a first sealing ring is further arranged between the connecting fitting and the end flange, an annular groove is formed in the periphery of the connecting fitting, and the first sealing ring is located in the annular groove.

The annular grooves are arranged in a plurality, and the annular grooves are sequentially arranged at intervals along the extending direction of the connecting fitting, so that the first sealing rings are sequentially arranged at intervals along the extending direction of the connecting fitting.

The inner wall of the first end of the end flange is provided with at least one step surface, and a second sealing ring is arranged between the step surface and the connecting fitting.

The first end of the end flange extends to the outside of the hollow tube to form a space with the outer peripheral surface of the hollow tube, and the space is filled with cementing materials.

The lightning arrester further comprises a bolt, and the bolt sequentially penetrates through the connecting fitting and the end flange to lock the connecting fitting and the end flange.

The outer peripheral surface of the hollow tube is coated with an insulating layer, and the insulating layer is an integrally injection molded silicone rubber umbrella skirt.

The lightning arrester core body comprises a plurality of resistor pieces which are sequentially sleeved on the periphery of the core rod, and the resistor pieces are electrically connected.

In order to achieve the above object, another technical scheme adopted by the present application is as follows: a transmission tower comprising a lightning arrester according to any one of the preceding claims, wherein one end of the lightning arrester is arranged on the tower body of the transmission tower, and the other end forms a free end or is connected with an insulator.

The beneficial effects are that: according to the lightning arrester disclosed by the application, the core rod is arranged in the hollow pipe, and the lightning arrester core body is sleeved on the periphery of the core rod, so that the core rod is utilized for supporting, the overall strength of the lightning arrester can be ensured, and the service life of the lightning arrester is prolonged.

In addition, the lightning arrester core body is clamped by the two clamping blocks, so that the lightning arrester core body can be prevented from being corroded by external water vapor, the lightning arrester core body can be protected, the clamping blocks are sleeved on the periphery of the connecting fitting and the core rod at the same time, the connection strength of the connecting fitting and the core rod can be ensured, and the connecting fitting and the core rod are prevented from being separated.

Meanwhile, the lightning arrester is independently arranged on the tower body, so that the length of the composite cross arm can be reduced on one hand, and the structure of the power transmission tower is more compact; on the other hand, compared with the prior art, the lightning arrester can be prevented from bearing the tensile force due to the longitudinal unbalanced tension of the end part of the composite cross arm, so that the service life of the lightning arrester is ensured. Or, can also integrate the arrester in compound cross arm, on the one hand can omit the installation component, save installation cost and installation time, on the other hand can also satisfy the lightning protection performance, and the first insulator that draws to one side is in series with the arrester and also can satisfy the tensile load requirement of compound cross arm, in addition because the setting of arrester, the length of first insulator that draws to one side is less than the distance of body of the tower to power transmission line far away, therefore the application can also shorten the length of first insulator that draws to one side, thereby reduce the cost.

Drawings

For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

fig. 1 is a schematic structural diagram of an embodiment of a power transmission tower according to the present application;

FIG. 2 is a schematic structural view of an embodiment of the composite cross arm of FIG. 1;

FIG. 3 is a schematic end view of another embodiment of the composite cross arm of FIG. 1;

FIG. 4 is an enlarged schematic view of the structure shown at A in FIG. 3;

FIG. 5 is a schematic end view of a further embodiment of the composite cross arm of FIG. 1;

fig. 6 is a schematic structural view of the end fitting of fig. 2;

fig. 7 is a schematic cross-sectional structure of the lightning arrester of fig. 2;

FIG. 8 is a schematic view of a portion of the structure of FIG. 7;

FIG. 9 is an enlarged schematic view of N in FIG. 8;

fig. 10 is a schematic structural view of an embodiment of the power transmission tower of the present application;

fig. 11 is a schematic structural view of another embodiment of the power transmission tower of the present application;

fig. 12 is a schematic structural view of a further embodiment of the power transmission tower of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that the terms "first," "second," and "second" are used herein for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1 and 2, the present application provides a power transmission tower 100, where the power transmission tower 100 includes a tower body 1100 and a composite cross arm 1200 disposed on the tower body 1100, and the composite cross arm 1200 includes a first cable-stayed insulator 1210, a pillar insulator 1220, and a lightning arrester 1230.

The first end 12301 of the lightning arrester 1230 is connected to the first end 12101 of the first cable-stayed insulator 1210, and the second end 12302 of the lightning arrester 1230 is connected to the tower body 1100; the first end 12201 of the post insulator 1220 is connected to the tower 1100 and the second end 12202 of the post insulator 1220 is connected to the second end 12102 of the first cable-stayed insulator 1210 to form the composite cross arm 1200 for hanging the end 1201 of the transmission line.

Specifically, the tower body 1100 may be a power transmission tower structure of a lattice type iron tower, a rod body or a composite material tower and other common structures, and the specific structure is not limited by the present application. Meanwhile, a composite cross arm 1200 (as shown in fig. 1) may be provided at one side of the tower body 1100, or the composite cross arm 1200 may be provided at multiple sides of the tower body 1100.

The lightning arrester 1230 is connected with the first cable-stayed insulator 1210, and one end of the lightning arrester 1230, which is not connected with the first cable-stayed insulator 1210 (i.e. the second end 12302 of the lightning arrester 1230), is connected with the tower body 1100, and one end of the first cable-stayed insulator 1210, which is not connected with the lightning arrester 1230, is used for forming the end 1201 of the composite cross arm 1200 for hanging the power transmission line, that is, after the lightning arrester 1230 and the first cable-stayed insulator 1210 are connected in series, the tower body 1100 and the power transmission line are connected.

In the prior art, compound cross arm and arrester are independent each other, and both are in the same place through installation component installation, and this kind of structure is complicated on the one hand, and installation component is more, and the installation is loaded down with trivial details, can increase installation cost and installation time, and on the other hand, insulating cooperation between compound cross arm and the arrester also needs to be carefully coordinated to satisfy lightning impulse characteristic requirement, and is higher to the requirement of installation.

In this embodiment, the lightning arrester 1230 is integrated in the composite cross arm 1200, so that on one hand, the installation assembly can be omitted, on the other hand, the installation cost and the installation time can be saved, and on the other hand, the lightning protection performance can be met, and the tensile load requirement of the composite cross arm 1200 can be met after the first cable-stayed insulator 1210 and the lightning arrester 1230 are connected in series.

With continued reference to fig. 1 and 2, the post insulator 1220 has one end connected to the tower 1100 and the other end connected to the second end 12102 of the first cable insulator 1210 to form the end 1201 of the composite cross arm 1200. The pillar insulator 1220 is connected with the first cable-stayed insulator 1210, so that the composite cross arm 1200 is in a stable triangle structure, and the stability of the composite cross arm 1200 can be ensured.

It should be noted that the number of post insulators 1220 is not limited by the present application, and may be one, two or more, wherein the number of post insulators 1220 is schematically illustrated in fig. 1.

With continued reference to fig. 2, the first cable-stayed insulator 1210 and the lightning arrester 1230 are coaxially disposed, that is, the extending directions of the first cable-stayed insulator 1210 and the lightning arrester 1230 are the same, and the axes of the first cable-stayed insulator 1210 and the lightning arrester 1230 are in the same straight line. The arrangement can ensure that the sum of the lengths of the first cable-stayed insulator 1210 and the lightning arrester 1230 is minimum on the premise that the distance between the transmission line and the tower body 1100 meets the requirement, thereby reducing the cost.

Of course, in other embodiments, an included angle may be formed between the first cable-stayed insulator 1210 and the lightning arrester 1230.

With continued reference to fig. 2, the composite cross arm 1200 further includes a second cable-stayed insulator 1240, the first end 12401 of the second cable-stayed insulator 1240 being connected to the tower 1100, the second end 12402 of the second cable-stayed insulator 1240 being connected to the second end 12102 of the first cable-stayed insulator 1210 and the second end 12202 of the post insulator 1220 to form the end 1201 of the composite cross arm 1200.

Specifically, the second cable-stayed insulator 1240 may further improve the strength and stability of the composite cross arm 1200, and prolong the service life of the power transmission tower 100. The first cable-stayed insulator 1210, the lightning arrester 1230 and the second cable-stayed insulator 1240 are all located on the same side of the pillar insulator 1220, and in fig. 1, the first cable-stayed insulator 1210, the lightning arrester 1230 and the second cable-stayed insulator 1240 are all located above the pillar insulator 1220.

Of course, in other embodiments, the composite cross arm may not include the second cable-stayed insulator.

In this embodiment, in order to ensure the uniformity and stability of the stress of the composite cross arm 1200, the sum of the lengths of the first cable-stayed insulator 1210 and the lightning arrester 1230 is set to be equal to the length of the second cable-stayed insulator 1240. Of course, in other embodiments, the sum of the lengths of the first cable-stayed insulator 1210 and the lightning arrester 1230 may also be less than or greater than the length of the second cable-stayed insulator 1240.

With continued reference to fig. 2, the composite cross arm 1200 further includes an end fitting 1250, the second end 12102 of the first cable-stayed insulator 1210 and the second end 12202 of the post insulator 1220 being connected together by the end fitting 1250 to form the end 1201 of the composite cross arm 1200.

When the composite cross arm 1200 further includes the second diagonal insulator 1240, the second end 12102 of the first diagonal insulator 1210, the second end 12202 of the post insulator 1220, and the second end 12402 of the second diagonal insulator 1240 are connected together by the end fittings 1250 to form the end 1201 of the composite cross arm 1200.

The end fitting 1250 is arranged to connect the first cable-stayed insulator 1210, the pillar insulator 1220 and the second cable-stayed insulator 1240 together, so that the strength and the stability of the composite cross arm 1200 structure can be ensured.

Referring to fig. 3 and 4, when the power transmission tower is a tension tower, in the extending direction of the power transmission line 1310, the power transmission line 1310 is disconnected at two sides of the tower body, the power transmission lines 1310 at two sides of the tower body are respectively and fixedly connected Yu Dashen through end fittings 1250, and the power transmission lines 1310 at two sides of the tower body are electrically connected through jumpers 1320 (the jumpers 1320 may also be called as leads). The end fitting 1250 comprises a connecting portion 1251 for connecting with the second end 12102 of the first cable-stayed insulator 1210 and the second end 12202 of the pillar insulator 1220, wherein the connecting portion 1251 is provided with two wire hanging plates 1252 and a jumper wire connecting piece 1253, the two wire hanging plates 1252 are distributed on two sides of the connecting portion 1251 along the extending direction of the power transmission line 1310, and the jumper wire 1320 is electrically connected with the power transmission line 1310 on two sides of the tower body and is hung on the jumper wire connecting piece 1253.

Specifically, the first cable-stayed insulator 1210 and the pillar insulator 1220 are connected together by a connection portion 1251. Wherein, connecting portion 1251 is tubular structure, and the wire hanging plate 1252 and jumper connector 1253 are all connected with the periphery of connecting portion 1251.

The hanger plate 1252 is used to connect power lines 1310 and the jumper connector 1253 is used to connect jumpers 1320. In order to facilitate the connection of the power line 1310 on both sides of the tower body, two hanging plates 1252 are disposed on both sides of the connection portion 1251 along the extending direction of the power line 1310. Specifically, in the extending direction along the power line 1310, the power line 1310 on one side of the tower body is tensioned by a tension clamp, the tension clamp is connected to one hanging plate 1252 of the end fitting 1250 by the tension fitting 1330, and at the same time, the power line on the other side of the tower body is also tensioned by another tension clamp, and the other tension clamp is connected to the other hanging plate 1252 of the end fitting 1250 by another tension fitting 1330. That is, along the extending direction of the power transmission line 1310, the power transmission lines 1310 on two sides of the tower body are respectively connected to two wire hanging plates 1252 on two sides of the connecting portion 1251 by tension-resistant fittings 1330. Jumper wires 1320 (lead wires) are electrically connected between strain clamps on two sides of the tower body so as to realize electric energy transmission.

Of course, in other embodiments, the two hanging wire plates may not be located at two sides of the connection portion along the extending direction of the power transmission line, so long as the two hanging wire plates can be guaranteed to be connected with the power transmission lines at two sides of the tower body respectively.

Wherein, in order to install the jumper 1320, a jumper connector 1253 is further provided on the connection portion 1251, the jumper connector 1253 is located at the bottom of the connection portion 1251, the jumper connector 1253 is located between two wire hanging plates 1252, and the jumper connector 1253 is connected with a wire hanging hardware string 1340 in a hanging manner, and then the jumper 1320 is connected with the wire hanging hardware string 1340 in a hanging manner.

It can be appreciated that the wire hanging plate 1252 and the jumper connector 1253 are both connected with the connecting portion 1251, so that the end fitting 1250 is compact in structure and high in connection strength. The jumper connector 1253 may have the same structure as the hanger plate 1252, for example, may be provided in a plate-like structure.

With continued reference to fig. 4, in order to implement connection between the strain clamp 1330 and the wire hanging plate 1252, a first mounting hole (not shown) may be further provided on the wire hanging plate 1252, and the strain clamp 1330 is mounted with the wire hanging plate 1252 through the first mounting hole.

In fig. 3, the wire hanging plate 1252 is provided with a first mounting hole, a connection point exists between the tension fitting 1330 and the wire hanging plate 1252, and at this time, the tension fitting 1330 includes a first tension-resistant connection plate 1331, a second tension-resistant connection plate 1332 and a first tension-resistant connection piece 1333.

The first tension-resistant connecting plates 1331 and the second tension-resistant connecting plates 1332 are arranged at intervals, one end of each first tension-resistant connecting piece 1333 is connected with each first tension-resistant connecting plate 1331, the other end of each first tension-resistant connecting piece 1333 is connected with each second tension-resistant connecting plate 1332, and in order to ensure the connection strength between the first tension-resistant connecting plates 1331 and the second tension-resistant connecting plates 1332, the number of the first tension-resistant connecting pieces 1333 is two, one ends of the two first tension-resistant connecting pieces 1333 are connected with the first tension-resistant connecting plates 1331, and the other ends of the two first tension-resistant connecting pieces 1333 are connected with the second tension-resistant connecting plates 1332.

Meanwhile, the first tension-resistant connecting plate 1331 is connected with the hanging wire plate 1252 through a first mounting hole, and the second tension-resistant connecting plate 1332 is connected with a tension-resistant wire clamp.

In order to ensure that the strain clamp 1330 is uniformly stressed, the strain clamp 1330 has a symmetrical structure. In an application scenario, as shown in fig. 4, the first tension-resistant connecting plate 1331 and the second tension-resistant connecting plate 1332 have the same structure, and two first tension-resistant connecting pieces 1333 are arranged in parallel.

Referring to fig. 5, in another embodiment, the hanging wire plate 1252 is provided with two first mounting holes, the tension-resistant hardware 1330 is connected with the hanging wire plate 1252 through the two first mounting holes, at this time, the connection strength between the tension-resistant hardware 1330 and the hanging wire plate 1252 can be ensured by the arrangement of the two first mounting holes, and it is ensured that the power transmission tower can span a railway, a highway, a canal and the like and span an overhead line. Meanwhile, the strain clamp 1330 includes a third strain connection plate 1334, a fourth strain connection plate 1335, and a second strain connection piece 1336.

The third tension connection plate 1334 is connected with a tension clamp. The number of the fourth tension-resistant connecting plates 1335 is two, the number of the second tension-resistant connecting pieces 1336 is two, the two fourth tension-resistant connecting plates 1335 are in one-to-one correspondence with the two second tension-resistant connecting pieces 1336, and the two fourth tension-resistant connecting plates 1335 are connected with the third tension-resistant connecting plates 1334 through the corresponding second tension-resistant connecting pieces 1336. And two fourth tension-resistant connecting plates 1335 are in one-to-one correspondence with two first mounting holes, and the two fourth tension-resistant connecting plates 1335 are connected with the hanging wire plate 1252 through the corresponding first mounting holes.

Similarly, in order to ensure that the strain insulator 1330 is uniformly stressed, the strain insulator 1330 is also in a symmetrical structure, and the symmetry axis of the strain insulator 1330 coincides with the symmetry axis of the third strain connection plate 1334.

Of course, in other embodiments, the number of the first mounting holes provided on the hanging board 1252 may be three, four or more, which is not limited herein.

Referring to fig. 4 and 5, in order to connect the jumper connector 1253 to the wire hanging hardware string 1340, a second mounting hole (not shown) may be further provided on the jumper connector 1253 for hanging the jumper.

The connection portion 1251, the wire hanging plate 1252, and the jumper connector 1253 may be integrally formed, or may be connected together by welding or the like.

It should be noted that the structure of the end fitting 1250 is not limited in the present application, and referring to fig. 2 and 6, in another embodiment, the end fitting 1250 includes a connection post 1255, a pillar connection plate 1256, a diagonal connection plate 1257, and a wire hanging portion 1258.

The connecting column 1255 is cylindrical, the side of the pillar connecting plate 1256 is abutted with the outer peripheral surface of the connecting column 1255, the other ends of the two pillar insulators 1220 which are not connected with the tower body 1100 are installed on the pillar connecting plate 1256 along the axial direction of the connecting column 1255 at intervals (the two pillar insulators 1220 are installed on the same side or different sides of the pillar connecting plate 1256), the number of the cable-stayed connecting plates 1257 is two, the two cable-stayed connecting plates 1257 are all arranged on the same side of the pillar connecting plate 1256 and are used for respectively installing the other ends of the first cable-stayed insulator 1210 and the second cable-stayed insulator 1240 which are not connected with the tower body 1100, the cable-stayed parts 1258 are located on the other sides of the pillar connecting plate 1256 which are far away from the cable-stayed connecting plates 1257 and extend along the outer peripheral surface of the connecting column 1255 to form a semi-surrounding structure, the cable-stayed connecting plate 1255 is used for hanging a power line, the number of the cable-stayed parts 1258 is two, the cable-stayed parts 1258 are arranged along the axial direction of the connecting column 1255 at intervals, and the cable-stayed parts 1258 are in a plate-like structure.

Referring to fig. 7 and 8, in the present embodiment, the lightning arrester 1230 includes a hollow tube 1231, a core rod 1232, a lightning arrester core 1233, and a connection fitting 1234.

The hollow tube 1231 is axially configured as a hollow structure, and other elements can be accommodated in the hollow tube 1231, and the hollow tube 1231 is a circular tube.

The core rod 1232 is disposed in the hollow tube 1231 and has the same extending direction as the hollow tube 1231, wherein the core rod 1232 is an insulating core rod, which may be a solid core rod or a hollow core rod, and may be specifically formed by winding glass fiber or aramid fiber impregnated epoxy resin, or by pultrusion or pultrusion winding, and the structure, material and forming manner of the core rod 1232 are not particularly limited.

The lightning arrester core 1233 is disposed in the hollow tube 1231 and sleeved on the outer periphery of the core rod 1232. Meanwhile, both ends of the core rod 1232 are connected with the connecting fitting 1234, and the connecting fitting 1234 is electrically connected with the lightning arrester core body 1233, and one end of the connecting fitting 1234, which is not connected with the core rod 1232, extends to the outside of the hollow tube 1231 to form the end of the lightning arrester 1230.

Specifically, the lightning arrester core 1233 has a nonlinear volt-ampere characteristic, when the lightning arrester 1230 is not struck by lightning and is in a normal operating voltage, the lightning arrester core 1233 presents a high resistance state, only small current is allowed to pass or no current is allowed to pass, when the lightning arrester 1230 is struck by lightning and is in an overvoltage state, the resistance of the lightning arrester core 1233 is suddenly reduced, and the resistance value of a circuit formed by connecting the two connecting hardware fittings 1234 in series with the lightning arrester core 1233 is small, so that instantaneous current generated by lightning is released.

In this embodiment, the core rod 1232 is disposed inside the hollow tube 1231, and the arrester core body 1233 is disposed around the core rod 1232, so that the overall strength of the arrester 1230 can be ensured and the service life of the arrester 1230 can be prolonged by supporting the core rod 1232. Meanwhile, the core rod 1232 and the hollow tube 1231 are coaxially arranged, so that the whole gravity center of the lightning arrester 1230 is positioned on the core rod 1232, and the core rod 1232 is more beneficial to supporting the whole lightning arrester 1230.

With continued reference to fig. 8, the lightning arrester core 1233 includes a plurality of resistor pieces 12331 sequentially sleeved on the periphery of the core rod 1232, where the plurality of resistor pieces 12331 are electrically connected, and the resistor pieces 12331 may be zinc oxide valve plates or special silicon carbide valve plates, and the material of the application is not limited.

The adjacent two resistor pieces 12331 may be directly contacted to achieve electrical connection, or may be electrically connected through a wire, or in order to ensure good electrical conductivity, the adjacent two resistor pieces 12331 may be electrically connected through a metal pad, so long as the electrical connection of the plurality of resistor pieces 12331 is ensured.

With continued reference to fig. 7 and 8, the lightning arrester 1230 further includes two clamping blocks 1235, the two clamping blocks 1235 are both located in the hollow tube 1231 and sleeved on the periphery of the mandrel 1232, meanwhile, the two clamping blocks 1235 are respectively located at two sides of the lightning arrester core 1233 to clamp the lightning arrester core 1233, the two clamping blocks 1235 are both electrically connected with the lightning arrester core 1233, and the two connecting fittings 1234 are each electrically connected with the adjacent clamping blocks 1235.

Specifically, the two clamping blocks 1235 clamp the lightning arrester core 1233, so that the lightning arrester core 1233 can be prevented from being corroded by external water vapor, and the lightning arrester core 1233 can be protected. Wherein the clamping block 1235 is made of conductive material, and the specific material is not limited by the present application. Meanwhile, the clamping blocks 1235 are also electrically connected with the adjacent connecting hardware 1234, so that the two connecting hardware 1234, the two clamping blocks 1235 and the lightning arrester core 1233 form a series circuit to release the instant current generated by lightning.

In order to ensure the connection strength between the core rod 1232 and the connection fitting 1234, an insertion slot 12341 is formed at one end of the connection fitting 1234 in the hollow pipe 1231, and one end of the core rod 1232 is inserted into the insertion slot 12341, specifically, the core rod 1232 and the connection fitting 1234 are fixedly connected through crimping or interference fit, and a clamping block 1235 adjacent to the connection fitting 1234 is sleeved on the peripheries of the connection fitting 1234 and the core rod 1232.

The clamping blocks 1235 are arranged and sleeved on the periphery of the connecting fitting 1234 and the core rod 1232, so that the connection strength between the connecting fitting 1234 and the core rod 1232 can be ensured, and the separation of the connecting fitting 1234 and the core rod 1232 is avoided.

In other embodiments, the clamping block 1235 may be only sleeved on the outer periphery of the core rod 1232, not sleeved on the outer periphery of the connecting fitting 1234, or in other embodiments, the clamping block 1235 may not be provided, and the connecting fitting 1234 and the lightning arrester core 1233 may be directly electrically connected.

With continued reference to fig. 7 and 8, the arrester 1230 further includes an end flange 1236 and a conductive spring 1237.

The number of the end flanges 1236 is two, the two end flanges 1236 are respectively sleeved on the peripheries of the two connecting fittings 1234 and respectively cover two ends of the hollow pipe 1231, parts of the end flanges 1236 extend into the hollow pipe 1231, meanwhile, conductive springs 1237 are respectively supported between each end flange 1236 and the adjacent clamping blocks 1235, and each end flange 1236 is electrically connected with the adjacent clamping block 1235 through the conductive springs 1237.

Specifically, the end flange 1236 is used to seal the end of the hollow tube 1231 from outside moisture that could penetrate the inside of the arrester 1230 and corrode the arrester core 1233.

Meanwhile, the end flanges 1236 are conductive elements, and are electrically connected with the clamping blocks 1235, so that the two end flanges 1236, the two clamping blocks 1235 and the lightning arrester core 1233 are connected in series to form a circuit capable of releasing current, and the lightning protection performance of the lightning arrester 1230 is further improved.

Meanwhile, in order to avoid the disconnection of the clamping block 1235 from the end flange 1236, the conductive spring 1237 is elastically supported between the end flange 1236 and the clamping block 1235 and electrically connects the end flange 1236 and the clamping block 1235. Because of the telescoping nature of the conductive spring 1237, the conductive spring 1237 ensures electrical connection between the end flange 1236 and the clamp block 1235 even if either the clamp block 1235 or the end flange 1236 is displaced.

Referring to fig. 8 and 9, for convenience of description, the first end 12361 of the end flange 1236 is defined, the first end 12361 of the end flange 1236 is adjacent to the end, which is not connected to the mandrel 1232, of the link fitting 1234, and in order to reduce moisture intrusion, at least one stepped surface 12362 is provided on the inner wall of the first end 12361 of the end flange 1236, wherein in fig. 9, the number of stepped surfaces 12362 is two.

With continued reference to fig. 9, to ensure the connection strength between the end flange 1236 and the connection fitting 1234, the lightning arrester 1230 further includes a bolt 12303, and the bolt 12303 passes through the connection fitting 1234 and the end flange 1236 in sequence to lock the two. With continued reference to fig. 9, to further reduce moisture intrusion, the first end 12361 of the end flange 1236 extends to the outside of the hollow tube 1231 to form a space 12363 with the outer circumferential surface of the hollow tube 1231, and the space 12363 is filled with a glue material 12364, wherein the glue material 12364 can ensure the connection strength between the end flange 1236 and the hollow tube 1231 on the one hand and can reduce moisture intrusion into the lightning arrester 1230 on the other hand.

With continued reference to fig. 7, in order to avoid corrosion of the hollow tube 1231 caused by various natural factors such as water, electricity, light, acid, etc. due to long-term exposure to air, the outer circumferential surface of the hollow tube 1231 is coated with an insulating layer 1238, and the insulating layer 1238 is an integrally injection-molded silicone umbrella skirt, which has good hydrophobicity and aging resistance, and has a long service life.

In order to further improve the tightness of the lightning arrester 1230, a first sealing ring 12391 is further arranged between the connecting fitting 1234 and the end flange 1236, an annular groove is arranged at the periphery of the connecting fitting 1234, the first sealing ring 12391 is located in the annular groove, wherein the number of the first sealing rings 12391 can be one, two or more, when the number of the first sealing rings 12391 is multiple, a plurality of annular grooves are arranged at the periphery of the connecting fitting 1234, and the plurality of annular grooves are sequentially arranged at intervals along the extending direction of the connecting fitting 1234, namely, the plurality of first sealing rings 12391 are sequentially arranged at intervals along the extending direction of the connecting fitting 1234.

With continued reference to fig. 9, a second sealing ring 12392 is disposed between the stepped surface 12362 of the end flange 1236 and the connecting fitting 1234, and the second sealing ring 12392 is closer to the axis L of the hollow tube 1231 than the bolt 12303. And a third sealing ring 12393 is arranged between the end flange 1236 and the end face of the hollow tube 1231. In other embodiments, more sealing rings may be provided according to specific requirements, which is not limited herein.

It should be noted that the specific structure of the lightning arrester 1230 is not limited in the present application, and in other embodiments, the lightning arrester 1230 may not include the core rod 1232.

In order to further improve the lightning protection performance of the composite cross arm 1200, referring to fig. 2, both end portions of the first cable-stayed insulator 1210 are sleeved with a grading ring 1211, and the periphery of the second end 12402 of the second cable-stayed insulator 1240 is also sleeved with a grading ring 1211. Of course, the equalizing ring 1211 may not be provided, and the present application is not particularly limited.

Referring to fig. 10, in one embodiment, power transmission tower 100 includes a tower body 1100, a composite cross arm 1200 and a lightning arrester 1230 disposed on tower body 1100, composite cross arm 1200 including a cross arm body 1210 and an arcing assembly 1220. The cross arm body 1210 includes at least one insulator 1211, the low voltage ends 1211a of the at least one insulator 1211 are each adapted to be connected to the tower 1100, and the high voltage ends 1211b of the at least one insulator 1211 are connected together to form the composite cross arm 1200 for hanging the end 1200a of the transmission line. The arcing component 1220 is connected to the end 1200a for the purpose of moving foxes, the lightning arrester 1230 is connected to the tower body 1100 and is located above the composite cross arm 1200, i.e. one end of the lightning arrester 1230 is connected to the tower body 1100, and the other end forms a free end. The electric gap between the arcing component 1220 and the lightning arrester 1230 is formed between the end of the arcing component 1220 close to the tower body 1100 and the free end of the lightning arrester 1230, and the electric gap between the arcing component 1220 and the lightning arrester 1230 is smaller than the electric gap between the high voltage end 1211b and the low voltage end 1211a of any one insulator 1211, so that under the condition of overvoltage, such as lightning strike, the electric gap between the arcing component 1220 and the lightning arrester 1230 can be broken down first, and the high current is prevented from flowing from the high voltage end 1211b to the low voltage end 1211a in any insulator 1211, so that the surface of the insulator 1211 is flashover, and the effect of protecting all insulators 1211 is achieved.

By independently installing the lightning arrester 1230 on the tower body 1100, on the one hand, since the lightning arrester 1230 can bear lightning overvoltage independently, only an operation overvoltage gap (the voltage value of the lightning overvoltage is larger than that of the operation overvoltage) is needed to be considered when the composite cross arm 1200 is designed, and compared with the case that the lightning arrester is not arranged on the power transmission tower or is directly and fixedly connected with the composite cross arm, the length of the composite cross arm 1200 can be reduced, so that the structure of the power transmission tower 100 is more compact; on the other hand, compared with the prior art, the lightning arrester 1230 can be prevented from bearing the tensile force due to the unbalanced longitudinal tension of the end 1200a of the composite cross arm 1200, thereby ensuring the service life of the lightning arrester 1230. Meanwhile, for some low-voltage-class power transmission towers 100, in areas with few mines or infrequent lightning activities, the lightning arrester 1230 can be arranged to replace the installation of the ground wire, i.e. the ground wire can be omitted, so that the height of the power transmission tower 100 can be reduced, and the cost is saved.

In this embodiment, at least one insulator 1211 includes a post insulator 12111 and a cable-stayed insulator 12112, the high voltage end 1211b of the post insulator 12111 and the high voltage end 1211b of the cable-stayed insulator 12112 are connected together, the low voltage end 1211a of the post insulator 12111 and the low voltage end 1211a of the cable-stayed insulator 12112 are respectively connected with two different positions of the tower body 1100, and the low voltage end 1211a of the post insulator 12111 and the low voltage end 1211a of the cable-stayed insulator 12112 are located on the same vertical line, at this time, the composite cross arm 1200 is in a stable triangle structure, so as to ensure the stability of the composite cross arm 1200. Meanwhile, the diagonal insulators 12112 are located above the post insulators 12111.

Referring to fig. 11, in another embodiment, one end of a lightning arrester 1230 is connected to a tower body 1100, and the other end forms a free end, and unlike the embodiment of fig. 10, at least one insulator 1211 includes two post insulators 12111 and one cable-stayed insulator 12112, the cable-stayed insulators 12112 are located at the same side of the two post insulators 12111, and the two post insulators 12111 and the cable-stayed insulator 12112 are arranged so that a stable triangle structure is formed between the composite cross arm and the tower body 1100 of the power transmission tower 100, so that the stability performance of the composite cross arm can be greatly improved, and at this time, the mounting heights of the two post insulators 12111 are the same, and the two post insulators 12111 are arranged in a V shape. The diagonal insulators 12112 are located above the two post insulators 12111.

Referring to fig. 12, in still another embodiment, one end of a lightning arrester 1230 is connected to a tower body 1100, and the other end also forms a free end, unlike the embodiment of fig. 10, at least one insulator 1211 includes two post insulators 12111 and two diagonal insulators 12112, the two diagonal insulators 12112 being located on the same side of the two post insulators 12111 and being disposed adjacent to the two post insulators 12111, respectively. The arrangement of the two post insulators 12111 and the two cable-stayed insulators 12112 enables the composite cross arm and the tower body 1100 of the power transmission tower 100 to be in a stable triangular structure, so that the stability of the composite cross arm can be greatly improved, at the moment, the installation heights of the two post insulators 12111 are the same, the installation heights of the two cable-stayed insulators 12112 are the same, and meanwhile, the two cable-stayed insulators 12112 are located above the two post insulators 12111.

The present application does not limit the number of post insulators 12111 and cable-stayed insulators 12112.

The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present application.

Claims (13)

1. A lightning arrester, comprising:

the hollow pipe is axially arranged to be of a hollow structure;

the core rod is arranged in the hollow pipe and has the same extending direction as the hollow pipe;

the lightning arrester core body is positioned in the hollow tube and sleeved on the periphery of the core rod;

the connecting fitting is connected with the two ends of the core rod, the connecting fitting is electrically connected with the lightning arrester core body, and one end, which is not connected with the core rod, of the connecting fitting extends to the outside of the hollow tube to form the end part of the lightning arrester.

2. The arrester of claim 1, further comprising:

the clamping blocks are arranged in the hollow tube and sleeved on the periphery of the core rod, the clamping blocks are respectively arranged on two sides of the lightning arrester core body to clamp the lightning arrester core body, the clamping blocks are electrically connected with the lightning arrester core body, and the clamping blocks are respectively electrically connected with adjacent connecting fittings.

3. The lightning arrester of claim 2, wherein an end of the connecting fitting in the hollow tube is provided with a slot, an end of the core rod is inserted in the slot, and the clamping blocks adjacent to the connecting fitting are sleeved on the periphery of the connecting fitting and the core rod at the same time.

4. The lightning arrester of claim 2 further comprising two end flanges, the two end flanges being respectively sleeved on the peripheries of the two connecting fittings and respectively covering both ends of the hollow tube, and portions of the end flanges extending into the hollow tube.

5. The arrester of claim 4 further comprising conductive springs supported between each of the end flanges and adjacent ones of the clamping blocks, each of the end flanges being electrically connected to adjacent ones of the clamping blocks by the conductive springs.

6. The lightning arrester of claim 4, wherein a first sealing ring is further disposed between the connection fitting and the end flange, an annular groove is disposed on the periphery of the connection fitting, and the first sealing ring is disposed in the annular groove.

7. The lightning arrester of claim 6, wherein the plurality of annular grooves are arranged in a plurality, and the plurality of annular grooves are arranged at intervals in sequence along the extending direction of the connecting fitting, so that the plurality of first sealing rings are arranged at intervals in sequence along the extending direction of the connecting fitting.

8. The arrester of claim 4 wherein the inner wall of the first end of the end flange is provided with at least one step surface, and a second seal ring is provided between the step surface and the connection fitting.

9. The arrester of claim 8 wherein the first end of the end flange extends to the exterior of the hollow tube to form a space with the outer peripheral surface of the hollow tube, the space being filled with a glue material.

10. The arrester of claim 4 further comprising bolts that pass sequentially through the connection fitting and the end flanges to lock the two together.

11. The lightning arrester of claim 1 wherein the outer peripheral surface of the hollow tube is coated with an insulating layer, the insulating layer being an integrally injection molded silicone umbrella skirt.

12. The arrester of claim 1 wherein the arrester core includes a plurality of resistive sheets sleeved around the core rod in sequence, the plurality of resistive sheets being electrically connected.

13. A transmission tower comprising a lightning arrester according to any of claims 1-12, wherein one end of the lightning arrester is arranged on the tower body of the transmission tower and the other end forms a free end or is connected to an insulator.