CN220539376U - Power transmission tower - Google Patents

Abstract

The application provides a transmission tower, this transmission tower include the body of the tower, set up in the compound cross arm and the arrester of body of the tower, and compound cross arm includes: the cross arm main body comprises at least one insulator, the low-voltage ends of the at least one insulator are connected with the tower body, the high-voltage ends of the at least one insulator are connected together through end fittings to form a composite cross arm for hanging the end part of the power transmission line, and the end fittings are provided with wire hanging plates for hanging the power transmission line; the arcing component is connected with the end fitting; the lightning arrester is connected with the tower body and is positioned above the composite cross arm; wherein, the electric gap between the arcing component and the lightning arrester is smaller than the electric gap between the high voltage end and the low voltage end of any one insulator. The composite cross arm is simple in design structure, applicable to composite cross arms of various structures, and capable of shortening the length of the composite cross arm under the condition of meeting the same lightning protection performance, so that the structure of the power transmission tower is more compact, and the service life of the lightning arrester can be guaranteed.

Description

Power transmission tower

Technical Field

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

Background

In order to improve the lightning protection performance of the power transmission tower, aiming at the double-column double-pull composite cross arm, a single lightning arrester is arranged in the middle of a plane formed by two composite post insulators in a conventional way, so that when the high-voltage end of the composite cross arm is subjected to lightning overvoltage, an air gap between two equalizing rings on the lightning arrester is broken down at first, and lightning current is released, so that the effect of protecting the composite cross arm is achieved.

However, on the one hand, the design has a plurality of installation components and complicated installation method, so that the cost and the installation time are increased, and on the other hand, the lightning arrester in the structure is extremely likely to bear the tensile force due to the longitudinal unbalanced tension of the end part of the composite cross arm, so that the lightning arrester is damaged. And the design can only be used for the composite cross arm with a double-column double-pull structure, and the application range is limited.

Disclosure of Invention

In view of this, this application provides a transmission tower, and the project organization is succinct, is suitable for the compound cross arm of multiple structure, and under the condition that satisfies the same lightning protection performance, can shorten the length of compound cross arm for transmission tower's structure is compacter, and also can guarantee the life of arrester.

In order to solve the above problem, this application provides a transmission tower, including the body of the tower, set up in compound cross arm and the arrester of body of the tower, compound cross arm includes: the cross arm main body comprises at least one insulator, wherein the low-voltage ends of the at least one insulator are connected with the tower body, the high-voltage ends of the at least one insulator are connected together through end fittings to form the end parts of the composite cross arm for hanging a power transmission line, and the end fittings are provided with wire hanging plates for hanging the power transmission line; the arcing component is connected with the end fitting; the lightning arrester is connected with the tower body and is positioned above the composite cross arm; an electrical gap between the arcing component and the arrester is less than an electrical gap between the high voltage end and the low voltage end of any one of the insulators.

This application sets up the electric gap between arcing subassembly and the arrester and is less than the electric gap between the high-pressure end and the low-pressure end of arbitrary insulator, can realize good protection effect, and through independently installing the arrester on the body of a tower, can reduce the length of compound cross arm on the one hand for the structure of transmission tower is compacter, and on the other hand compares with prior art, can also avoid the arrester to bear the pulling force because of the vertical unbalanced tension of compound cross arm tip, thereby guarantees the life of arrester.

The cross arm main body, the arcing component and the lightning arrester are of plane symmetry structures, and symmetry planes of the cross arm main body, the arcing component and the lightning arrester coincide.

The arrangement can ensure that the cross arm main body, the arcing component and the overall structure of the lightning arrester are stressed more uniformly, and the space distribution is simpler.

The arc-striking assembly comprises an arc-striking rod and an arc-striking ball, wherein a first end of the arc-striking rod is connected with the end part of the composite cross arm, a second end of the arc-striking rod is connected with the arc-striking ball, and the arc-striking ball is used as an arc-striking end of the arc-striking assembly.

The arcing component can prevent the electric arc from flashing along the insulator, and meanwhile, the electric field of the high-voltage end of the cross arm is uniformly compounded.

Wherein the second end of the arcing bar extends toward the low voltage end of the insulator.

The electric gap between the arcing ball and the lightning arrester can be reduced by the arrangement, and lightning protection performance is improved.

The end fitting comprises a connecting part, wherein the connecting part is used for being connected with the high-voltage end of at least one insulator, two wire hanging plates and jumper wire connecting pieces are arranged on the connecting part, the two wire hanging plates are distributed on two sides of the connecting part along the extending direction of the power transmission line, at least one first mounting hole is formed in the wire hanging plates, and the jumper wires are electrically connected with the power transmission lines on two sides of the tower body and are connected to the jumper wire connecting pieces in a hanging mode.

The strength of the end fitting can be guaranteed through the arrangement, and the electric connection of the power transmission lines on two sides of the tower body can be realized through the end fitting.

Wherein, the tip fitting includes: the first connecting column is cylindrical; the side edge of the pillar connecting plate is abutted with the outer peripheral surface of the first connecting column; the two inclined pulling connecting plates are arranged on the same side of the support connecting plate.

The end fitting is simple in structure and convenient to install.

Wherein the at least one insulator comprises a post insulator and a cable-stayed insulator; the number of the post insulators and the cable-stayed insulators is one, or the number of the post insulators is two, and the number of the cable-stayed insulators is two.

The setting at least one insulator includes pillar insulator and draws the insulator to one side, can make the cross arm main part constitute stable structure, and can also set up pillar insulator, draw the quantity of insulator to one side in a flexible way for the suitability of transmission tower is wider.

The lightning arrester is arranged on one side of the cable-stayed insulator, which is away from the post insulator, and the arcing component and the lightning arrester are both arranged on one side of the cable-stayed insulator, which is away from the post insulator.

The arrangement can further reduce the risk of lightning striking the composite cross arm.

Wherein, the quantity of cable-stay insulator is one, compound cross arm further includes: the mounting plate is used for being mounted on the tower body; the lightning arrester and the low-voltage end of the insulator are connected with the mounting plate.

The insulator and the lightning arrester are connected with the mounting plate, so that the convenience of mounting can be improved.

Wherein, the arrester includes: 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 two ends of the core rod, and the connecting fitting is electrically connected with the lightning arrester core body, wherein 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.

The core rod is arranged in the hollow pipe, the lightning arrester core body is sleeved on the periphery of the core rod, the core rod is utilized to play a supporting role, the integral strength of the lightning arrester can be ensured, and the service life of the composite cross arm is prolonged.

The beneficial effects are that: according to the electric gap between the arcing component and the lightning arrester is smaller than the electric gap between the high-voltage end and the low-voltage end of any one insulator, a good protection effect can be achieved, and the lightning arrester is independently arranged on the tower body, on one hand, because the lightning arrester can bear lightning overvoltage independently, only the operation overvoltage gap (the voltage value of the lightning overvoltage is larger than the voltage value of the operation overvoltage) is needed to be considered when the composite cross arm is designed, compared with the situation that the lightning arrester is not arranged on the power transmission tower or the lightning arrester is directly and fixedly connected with the composite cross arm, the length of the composite cross arm can be reduced, 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.

Meanwhile, the symmetrical planes of the cross arm main body, the arcing component and the lightning arrester are overlapped, so that the composite cross arm is uniformly stressed, and the service life of the composite cross arm is prolonged.

At least one insulator includes pillar insulator and draws insulator to one side simultaneously for compound cross arm forms stable structure, and pillar insulator, drawing insulator's quantity to one side simultaneously can select according to actual conditions, and application scope is wide.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural view of a first embodiment of a transmission tower of the present application;

FIG. 2 is an enlarged schematic view of the structure at M in FIG. 1;

FIG. 3 is a schematic structural view of another embodiment of an arcing component;

fig. 4 is a schematic structural diagram of connection between an end fitting and an insulator according to an embodiment of the present application;

FIG. 5 is an enlarged schematic view at A in FIG. 4;

fig. 6 is a schematic structural diagram of connection between an end fitting and an insulator according to another embodiment of the present application;

fig. 7 is a schematic structural view of a second embodiment of the transmission tower of the present application;

fig. 8 is a schematic structural view of a third embodiment of a transmission tower of the present application;

FIG. 9 is an enlarged schematic view at B in FIG. 7;

fig. 10 is a schematic structural view of the end fitting of fig. 8;

fig. 11 is a schematic sectional view of a lightning arrester according to an embodiment;

FIG. 12 is a schematic view of a portion of the structure of FIG. 11;

fig. 13 is an enlarged schematic view at N in fig. 12.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Referring to fig. 1, the present application provides a power transmission tower 100, where the power transmission tower 100 includes a tower body 1100, a composite cross arm 1200 and a lightning arrester 1230 disposed on the tower body 1100, and the composite cross arm 1200 includes a cross arm body 1210 and an arcing component 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 body 1100, and the high voltage ends 1211b of the at least one insulator 1211 are connected together to form the end 1200a of the composite cross arm 1200 for hanging a power transmission line; the arcing component 1220 is connected to the end 1200a of the composite cross arm 1200. The lightning arrester 1230 is connected with the tower body 1100 and is positioned above the composite cross arm 1200; the electrical gap between arcing component 1220 and lightning conductor 1230 is less than the electrical gap between the high voltage end 1211b and the low voltage end 1211a of any one insulator 1211.

Specifically, a composite cross arm 1200 (as shown in fig. 1) may be provided on one side of the tower body 1100, or the composite cross arm 1200 may be provided on multiple sides of the tower body 1100. In the cross arm main body 1210, the number of the insulators 1211 may be one or plural, and is not limited herein. The insulators 1211 have a low voltage end 1211a and a high voltage end 1211b, the low voltage end 1211a being connected to the tower 1100, and the high voltage end 1211b of at least one insulator 1211 being connected together to form the end 1200a of the composite cross arm 1200 for hanging a power line. Note that, when the number of the insulators 1211 is one, the high voltage end 1211b of the insulator 1211 forms the end 1200a of the composite cross arm 1200, and when the number of the insulators 1211 is plural, the high voltage ends 1211b of the plurality of insulators 1211 are connected together to form the end 1200a of the composite cross arm 1200.

The arcing component 1220 is connected to the end 1200a for arcing, the lightning arrester 1230 is connected to the tower body 1100 and is located above the composite cross arm 1200, the electrical gap between the arcing component 1220 and the lightning arrester 1230 is smaller than the electrical gap between the high voltage end 1211b and the low voltage end 1211a of any one insulator 1211, and the design can make the electrical gap between the arcing component 1220 and the lightning arrester 1230 break down first under the condition of overvoltage, such as lightning strike, so as to prevent large current from flowing from the high voltage end 1211b to the low voltage end 1211a in any insulator 1211 to cause flashover on the surface of the insulator 1211, thereby protecting all insulators 1211.

As can be seen from the above, the electrical gap between the arcing component 1220 and the lightning arrester 1230 is smaller than the electrical gap between the high voltage end 1211b and the low voltage end 1211a of any one of the insulators 1211, so that a good protection effect can be achieved, and by independently mounting the lightning arrester 1230 on the tower body 1100, on one hand, since the lightning arrester 1230 can bear lightning overvoltage alone, only the operation overvoltage gap (the voltage value of the lightning overvoltage is larger than that of the operation overvoltage) needs to be considered when designing the composite cross arm 1200, compared with the case that no lightning arrester is arranged on the transmission tower or the lightning arrester 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 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.

With continued reference to fig. 1, the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 are all in a plane-symmetric structure, and the symmetry planes of the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 coincide.

Specifically, on one hand, the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 are all in plane symmetry structure, so that the respective stress can be ensured to be uniform; on the other hand, the symmetry planes of the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 are coincident, that is, the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 have the same symmetry plane, so that the whole composite cross arm 1200 can be stressed more uniformly by the design, the service life of the composite cross arm 1200 is ensured, and the minimum electric gap between the arcing component 1220 and the lightning arrester 1230 can be ensured, so that the length of the insulator 1211 can be designed to be minimized.

Of course, in some other embodiments, the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 may be arranged in a plane other than symmetrical, or the cross arm body 1210, the arcing component 1220 and the lightning arrester 1230 may not overlap each other in plane.

Referring to fig. 1 and 2, arcing component 1220 includes arcing rod 1221 and arcing ball 1222, first end 1221a of arcing rod 1221 being connected to end 1200a of composite cross arm 1200, second end 1221b being connected to arcing ball 1222, arcing ball 1222 being the arcing end of arcing component 1220.

Specifically, first end 1221a of arcing bar 1221 is connected with end 1200a of composite cross arm 1200 for effecting connection of arcing assembly 1220 with composite cross arm 1200. Arcing ball 1222 is connected to a second end 1221b of arcing rod 1221 as the arcing end of arcing assembly 1220. Wherein the use of arcing balls 1222 can ensure uniformity of the electric field, while arcing bars 1221 can act to separate arcing balls 1222 from insulator 1211 when arcing balls 1222 are arcing, thus avoiding the impact of arcing balls 1222 on insulator 1211.

In the present embodiment, as shown in fig. 2, the arcing rod 1221 extends in a straight direction. In other embodiments, referring to fig. 3, the arc-striking rod 1221 has a multi-section bending structure, including multi-section arc-striking sections 12211 connected in sequence, wherein the multi-section arc-striking sections 12211 are connected in sequence smoothly in order to ensure uniform distribution of the electric field.

Wherein the entire surface of the arcing rod 1221 is a smooth surface, i.e. the surface of the arcing rod 1221 is polished to avoid sharp corners, in order to ensure a uniform distribution of the electric field.

With continued reference to fig. 1 and 2, the second end 1221b of the arcing rod 1221 extends toward the low voltage end 1211a of the insulator 1211.

Specifically, the second end 1221b of the arcing rod 1221 extends toward the low voltage end 1211a of the insulator 1211, which may cause the arcing ball 1222 to be spatially closer to the lightning arrester 1230 side, may act to reduce the electrical gap between the arcing ball 1222 and the lightning arrester 1230, improve lightning protection performance, and may minimize the length of the composite cross arm 1200, and save costs.

Wherein in order to ensure that the second end 1221b of the arcing rod 1221 extends towards the low voltage end 1211a of the insulator 1211, the angle between the direction of extension of the arcing rod 1221 and the direction of extension of the insulator 1211 is not more than 90 °, for example 15 °, 30 ° or 60 °.

Of course, in other embodiments, the second end 1221b of the arcing rod 1221 may also extend away from the low voltage end 1211a of the insulator 1211, at which point the electrical gap between the arcing ball 1222 and the arrester 1230 may be reduced by extending the length of the arrester 1230, as compared to the designs described above.

Referring to fig. 1 and 2, the composite cross arm 1200 further includes end fittings 1240, and the high voltage ends 1211b of the at least one insulator 1211 are connected together by the end fittings 1240 to form an end 1200a of the composite cross arm 1200; wherein arcing component 1220 is connected to end fitting 1240.

Specifically, the end fitting 1240 connects the high voltage ends 1211b of all insulators 1211, realizing that the high voltage ends 1211b of all insulators 1211 are connected together. Wherein the high voltage ends 1211b of all insulators 1211 are connected by the end fitting 1240, the stability of all insulators 1211 being connected together can be ensured, and the stability and firmness of the composite cross arm 1200 can be further ensured. Meanwhile, the arcing component 1220 is connected with the end fitting 1240, and the arcing component 1220 is directly installed on the end fitting 1240 during installation, so that the convenience of installation can be improved.

Referring to fig. 4 and 5, when the power transmission tower is a tension tower, the power transmission lines 1340 are disconnected at both sides of the tower body along the extension direction of the power transmission lines 1340, the power transmission lines 1340 at both sides of the tower body are fixedly connected Yu Dashen through end fittings 1240, respectively, and the power transmission lines 1340 at both sides of the tower body are electrically connected through jumpers 1330 (leads).

The end fitting 1240 includes a connection part 1241, which is used for being connected with the high voltage end 1211b of at least one insulator 1211, wherein two wire hanging plates 1242 and a jumper wire connector 1243 are arranged on the connection part 1241, the two wire hanging plates 1242 are distributed on two sides of the connection part 1241 along the extending direction of the power transmission line 1340, and the jumper wire 1330 is electrically connected with the power transmission line 1340 on two sides of the tower body and is hung on the jumper wire connector 1243.

Specifically, the high voltage ends 1211b of all insulators 1211 may be connected together by a connection part 1241. Wherein, connecting portion 1241 is tubular structure, and wire hanging plate 1242 and wire jumper connecting piece 1243 are all connected with connecting portion 1241's periphery.

The patch panel 1242 is used to connect power lines 1340 and the jumper connector 1243 is used to connect jumpers 1330. In order to facilitate the hooking of the power lines 1340 on both sides of the tower body, two hooking plates 1242 are disposed on both sides of the connection part 1241 along the extending direction of the power lines 1340. Specifically, in the extending direction along the power line 1340, the power line 1340 on one side of the tower body is tensioned by a tension clamp, the tension clamp is connected to one hanging plate 1242 of the end fitting 1240 by the tension fitting 1310, 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 1242 of the end fitting 1240 by another tension fitting 1310. That is, along the extending direction of the power line 1340, the power lines 1340 on both sides of the tower body are respectively connected to two hanging wire plates 1242 on both sides of the connecting portion 1241 by two strain gauges 1310. Jumper 1330 (lead) is 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.

The utility model discloses still use wire jumper 1330 electricity to connect the power transmission line 1340 of body of the tower both sides, and in order to install wire jumper 1330, still set up wire jumper connecting piece 1243 on connecting portion 1241, wire jumper connecting piece 1243 is located the bottom of connecting portion 1241, and wire jumper connecting piece 1243 is located between two hanging wire boards 1242, the wire jumper is connected to hang wire gold utensil cluster 1320 on the wire jumper connecting piece 1243, then articulates wire jumper 1330 through hanging wire gold utensil cluster 1320. It can be appreciated that the wire hanging plate 1242 and the jumper connector 1243 are both connected with the connecting part 1241, so that the end fitting 1240 is ensured to have compact structure and high connection strength.

The jumper connector 1243 may be of the same structure as the hanger plate 1242, for example, all provided in a plate-like structure.

With continued reference to fig. 4 and fig. 5, in order to implement connection between the tension fitting 1310 and the wire hanging plate 1242, a first mounting hole may be further provided on the wire hanging plate 1242, and the tension fitting 1310 is mounted together with the wire hanging plate 1242 through the first mounting hole.

In the embodiment of fig. 5, the wire hanging plate 1242 is provided with a first mounting hole, a connection point exists between the tension fitting 1310 and the wire hanging plate 1242, and the tension fitting 1310 includes a first tension-resistant connection plate 1311, a second tension-resistant connection plate 1312, and a first tension-resistant connection piece 1313.

The first tension-resistant connecting plates 1311 and the second tension-resistant connecting plates 1312 are arranged at intervals, one end of each first tension-resistant connecting piece 1313 is connected with each first tension-resistant connecting plate 1311, the other end of each first tension-resistant connecting piece 1313 is connected with each second tension-resistant connecting plate 1312, and in order to ensure the connection strength between the first tension-resistant connecting plates 1311 and the second tension-resistant connecting plates 1312, the number of the first tension-resistant connecting pieces 1313 is two, one ends of the two first tension-resistant connecting pieces 1313 are connected with the first tension-resistant connecting plates 1311, and the other ends of the two first tension-resistant connecting pieces 1313 are connected with the second tension-resistant connecting plates 1312.

Meanwhile, the first tension-resistant connecting plate 1311 is connected with the hanging wire plate 1242 through a first mounting hole, and the second tension-resistant connecting plate 1312 is connected with a tension-resistant wire clamp.

In order to ensure that the strain insulator-gold 1310 is uniformly stressed, the strain insulator-gold 1310 has a symmetrical structure. In an application scenario, as shown in fig. 5, the first tension-resistant connection board 1311 and the second tension-resistant connection board 1312 have the same structure, and two first tension-resistant connection pieces 1313 are disposed in parallel.

In yet another embodiment, referring to fig. 6, the wire hanging plate 1242 is provided with two first mounting holes, and the strain clamp 1310 is connected with the wire hanging plate 1242 through the two first mounting holes, so that the connection strength between the strain clamp 1310 and the wire hanging plate 1242 can be ensured by the arrangement of the two first mounting holes, and the transmission tower can be ensured to span a railway, a highway, a canal and the like and span an overhead line. The strain body 1310 includes a third strain body 1314, a fourth strain body 1315, and a second strain body 1316.

The third tension connection plate 1314 is connected to a tension clamp. The number of the fourth tension-resistant connecting plates 1315 is two, the number of the second tension-resistant connecting pieces 1316 is two, the two fourth tension-resistant connecting plates 1315 are in one-to-one correspondence with the two second tension-resistant connecting pieces 1316, and the two fourth tension-resistant connecting plates 1315 are connected with the third tension-resistant connecting plates 1314 through the respective corresponding second tension-resistant connecting pieces 1316. And two fourth tension-resistant connection plates 1315 are in one-to-one correspondence with two first mounting holes, and the two fourth tension-resistant connection plates 1315 are connected with the wire hanging plate 1242 through the respective corresponding first mounting holes.

Similarly, in order to ensure that the strain gauge 1310 is uniformly stressed, the strain gauge 1310 is also in a symmetrical structure, and the symmetry axis of the strain gauge 1310 coincides with the symmetry axis of the third strain connection plate 1314.

Of course, in other embodiments, the number of the first mounting holes provided on the hanging board 1242 may be three, four or more, which is not limited herein.

Likewise, to connect the jumper connector 1243 to the wire hanging hardware string 1320, a second mounting hole (not shown) may be provided on the jumper connector 1243 for hanging the jumper.

The connecting portion 1241, the wire hanging plate 1242 and the jumper connecting piece 1243 may be integrally formed, or may be connected together by welding or the like.

Referring to fig. 1, at least one insulator 1211 includes a post insulator 12111 and a cable-stayed insulator 12112.

Specifically, the number of the post insulators 12111 and the cable-stayed insulators 12112 is not limited, and the number of the post insulators 12111 and the cable-stayed insulators 12112 may be one or more.

For example, in fig. 1, the number of the post insulators 12111 and the cable-stayed insulators 12112 is one, at this time, 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. Wherein the cable-stayed insulator 12112 is located above the pillar insulator 12111.

Also for example, in fig. 7, the number of pillar insulators 12111 is two, and the number of cable-stayed insulators 12112 is one. At this time, the diagonal insulators 12112 are located at the same side of the two pillar insulators 12111, and the two pillar insulators 12111 and the diagonal insulators 12112 are arranged to form a stable triangle structure between the composite cross arm and the tower body 1100 of the power transmission tower 100, so that the stability of the composite cross arm can be greatly improved, and at this time, the mounting heights of the two pillar insulators 12111 are the same, and the two pillar insulators 12111 are arranged in a V shape. The diagonal insulators 12112 are located above the two post insulators 12111.

Also for example, in fig. 8, the number of pillar insulators 12111 is two, and the number of cable-stayed insulators 12112 is two. At this time, the two cable-stayed insulators 12112 are located on the same side of the two pillar insulators 12111 and are disposed adjacent to the two pillar 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.

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

Referring to fig. 7 and 9, when the number of pillar insulators 12111 is two and the number of cable-stayed insulators 12112 is one, the end fitting 1240 includes a flange cylinder 1244, a second connection post 1245 and a reinforcement plate 1246.

The second connecting posts 1245 are cylindrical, the number of the flange cylinders 1244 is two, one ends of the two post insulators 12111, which are not connected with the tower body, are fixedly connected with the two flange cylinders 1244 respectively, the two flange cylinders 1244 are arranged in a V shape, one ends of the two flange cylinders 1244 are mutually abutted and fixedly connected to the end parts of the second connecting posts 1245, the other ends of the two flange cylinders 1244 are mutually far away from each other and are fixedly connected with the two post insulators 12111 respectively, and accordingly the two post insulators 12111 connected with the two flange cylinders 1244 respectively are arranged in a V shape.

The second connecting posts 1245 and the two flange cylinders 1244 are respectively located at two sides of the reinforcing plate 1246 and are connected with the reinforcing plate 1246, and the strength of the end fitting 1240 can be ensured by the arrangement of the reinforcing plate 1246.

Meanwhile, the outer peripheral surface of the second connecting post 1245 is also provided with a connecting lug 12451, and the cable-stayed insulator 12112 and the arcing component 1220 are connected with the connecting lug 12451 at the same time.

And the second connecting post 1245 is also provided with a hanging wire board on its outer peripheral surface, so as to be used for hanging the power line, and the positions and the number of the hanging wire boards are set according to the hanging wire layout, which is not described in detail.

Referring to fig. 8 and 10, when the number of the post insulators 12111 and the cable-stayed insulators 12112 is two, the end fitting 1240 includes a first connection post 1247, a post connection plate 1248, a cable-stayed connection plate 1249, and a hanging wire portion 12491.

The first connecting post 1247 is cylindrical, the side edge of the post connecting plate 1248 is abutted with the outer peripheral surface of the first connecting post 1247, the other ends of the two post insulators 12111 which are not connected with the tower body 1100 are installed on the post connecting plate 1248 at intervals along the axial direction of the first connecting post 1247 (the two post insulators 12111 are installed on the same side or different sides of the post connecting plate 1248), the number of the cable-stayed connecting plates 1249 is two, the two cable-stayed connecting plates 1249 are all arranged on the same side of the post connecting plate 1248 and are used for respectively installing the other ends of the two cable-stayed insulators 12112 which are not connected with the tower body 1100, the cable-hanging parts 12491 are located on the other side of the post connecting plate 1248 which is far away from the cable-stayed connecting plate 1249 and extend along the outer peripheral surface of the first connecting post 1247 to form a semi-surrounding structure, the number of the cable-hanging parts 12491 is two, the two cable-hanging parts 12491 are arranged at intervals along the axial direction of the first connecting post 1247, and the cable-hanging parts 12491 are in a plate-like structure, namely the cable-hanging plates 12491.

With continued reference to fig. 1, when the number of cable-stayed insulators 12112 is one, the composite cross arm 1200 further includes a mounting plate 1250, the mounting plate 1250 is configured to be mounted on the tower body 1100, and the lightning arrester 1230 and the low voltage end 1211a of the cable-stayed insulator 12112 are both connected to the mounting plate 1250.

Specifically, the mounting plate 1250 is used to mount the low voltage end 1211a of the cable-stayed insulator 12112 and the lightning arrester 1230 on the tower 1100, and when mounting, the mounting plate 1250 may be mounted on the tower 1100, then the lightning arrester 1230, the low voltage end 1211a of the cable-stayed insulator 12112 and the mounting plate 1250 are mounted together, or the lightning arrester 1230, the low voltage end 1211a of the cable-stayed insulator 12112 and the mounting plate 1250 may be mounted together, and then the mounting plate 1250 is mounted on the tower 1100.

It can be appreciated that the installation of the lightning arrester 1230, the low voltage end 1211a of the cable-stayed insulator 12112 and the tower body 1100 is simultaneously implemented through the installation plate 1250, so that the connection between the composite cross arm 1200, the lightning arrester 1230 and the tower body 1100 can be implemented only through one connection point, and more connection points are avoided being arranged on the tower body 1100, thereby ensuring the strength of the tower body 1100. And if the arrester is located the position that the insulator is located the body of a tower to one side to be higher than the position that the insulator is located the body of a tower to one side, the electric gap between the arcing subassembly and the arrester will increase to need to set the size of pillar insulator bigger, and then improved composite cross arm's manufacturing cost, increased composite cross arm's weight. According to the lightning arrester, the lightning arrester 1230 and the cable-stayed insulator 12112 are connected to the same position on the tower body 1100, so that the electric gap between the arcing component and the lightning arrester is optimal, the size of the post insulator can be reduced, and the cost is reduced.

In other embodiments, the mounting plate 1250 may not be provided, and the low voltage end 1211a of the cable-stayed insulator 12112 and the lightning arrester 1230 may be directly fixed to the tower body 1100.

Referring to fig. 1, the arcing component 1220 and the lightning conductor 1230 are both located on a side of the cable-stayed insulator 12112 facing away from the pillar insulator 12111.

Specifically, the arcing component 1220 and the lightning arrester 1230 are both disposed on the same side of the diagonal insulator 12112 and away from the pillar insulator 12111, so that when the arcing component 1220 is arcing and flowing toward the lightning arrester 1230, the overvoltage is prevented from passing through the insulator 1211, and the risk of the insulator 1211 being damaged by the overvoltage is reduced.

Of course, in other embodiments, it is also possible to choose the arcing component 1220 and the lightning conductor 1230 to be located on different sides of the cable-stayed insulator 12112 or the pillar insulator 12111, or to provide the arcing component 1220 and the lightning conductor 1230 to be located on the side of the pillar insulator 12111 facing away from the cable-stayed insulator 12112.

Referring to fig. 2, a grading ring 12110 is sleeved around the high voltage end 1211b of each insulator 1211.

Specifically, the grading ring 12110 acts to homogenize the electric field of the high voltage end 1211b of the insulator 1211. As shown in fig. 2, the equalizing ring 12110 may have a ring structure, and the outer wall of the equalizing ring 12110 is uniformly spaced from the sleeved high pressure end 1211 b.

In other embodiments, only a portion of the high voltage end 1211b of the insulator 1211 may be sleeved with the equalizing ring 12110.

Referring to fig. 11 and 12, 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, wherein 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 lightning arrester core body 1233 is disposed around the core rod 1232, so that the overall strength of the lightning arrester 1230 can be ensured and the service life of the composite cross arm 1200 can be prolonged by using the core rod 1232 to perform a supporting function. 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. 11 and 12, the lightning arrester core 1233 includes a plurality of resistor pieces 12331 sequentially sleeved on the periphery of the mandrel 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.

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. 11 and 12, 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 core rod 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 in this 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. 11 and 12, 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.

With continued reference to fig. 13, 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 peripheral 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. 11 and 12, 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.

Referring to fig. 13, in order to further improve the tightness of the lightning arrester 1230, a first sealing ring 12391 is further disposed between the connection fitting 1234 and the end flange 1236, an annular groove is disposed at the periphery of the connection fitting 1234, the first sealing ring 12391 is disposed in the annular groove, wherein the number of the first sealing rings 12391 may be one, two or more, and when the number of the first sealing rings 12391 is plural, the periphery of the connection fitting 1234 is provided with a plurality of annular grooves, and the plurality of annular grooves are sequentially disposed at intervals along the extending direction of the connection fitting 1234, that is, the plurality of first sealing rings 12391 are sequentially disposed at intervals along the extending direction of the connection fitting 1234.

With continued reference to fig. 13, 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 12301. 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 this application, and in other embodiments, the lightning arrester 1230 may not include the mandrel 1232.

In addition, the present application further includes the composite cross arm 1200, and the specific structure thereof can be referred to the above related matters, which are not described herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. The utility model provides a transmission tower, its characterized in that includes the body of the tower, set up in compound cross arm and the arrester of body of the tower, compound cross arm includes:

the cross arm main body comprises at least one insulator, wherein the low-voltage ends of the at least one insulator are connected with the tower body, the high-voltage ends of the at least one insulator are connected together through end fittings to form the end part of the composite cross arm for hanging a power transmission line, the end fittings are provided with wire hanging plates for hanging the power transmission line, and the periphery of the high-voltage end of the at least one insulator is sleeved with a equalizing ring;

the arcing component is connected with the end fitting;

the lightning arrester is connected with the tower body and is positioned above the composite cross arm;

an electrical gap between the arcing component and the arrester is less than an electrical gap between the high voltage end and the low voltage end of any one of the insulators.

2. The power transmission tower of claim 1, wherein the cross arm body, the arcing component and the lightning arrester are of a plane-symmetric structure, and wherein the symmetry planes of the cross arm body, the arcing component and the lightning arrester are coincident.

3. The power transmission tower of claim 1, wherein the arcing component comprises an arcing rod and an arcing ball, a first end of the arcing rod being connected to the end of the composite cross arm and a second end being connected to the arcing ball, the arcing ball being an arcing end of the arcing component.

4. A transmission tower according to claim 3, wherein the second end of the arcing bar extends towards the low voltage end of the insulator.

5. The power transmission tower according to claim 1, wherein the end fitting comprises a connecting portion for connecting with the high voltage end of the at least one insulator, two wire hanging plates and jumper wire connecting pieces are arranged on the connecting portion, the two wire hanging plates are distributed on two sides of the connecting portion along the extending direction of the power transmission line, at least one first mounting hole is formed in the wire hanging plates, and the jumper wires are electrically connected with the power transmission lines on two sides of the tower body and are connected to the jumper wire connecting pieces in a hanging mode.

6. The power transmission tower of claim 1, wherein the end fittings comprise:

the first connecting column is cylindrical;

the side edge of the pillar connecting plate is abutted with the outer peripheral surface of the first connecting column;

the two inclined pulling connecting plates are arranged on the same side of the support connecting plate.

7. The power transmission tower of claim 1, wherein the at least one insulator comprises a post insulator and a cable-stayed insulator;

the number of the post insulators and the cable-stayed insulators is one, or the number of the post insulators is two, and the number of the cable-stayed insulators is two.

8. The power transmission tower of claim 7, wherein the arcing component and the lightning arrester are both located on a side of the cable-stayed insulator facing away from the post insulator.

9. The power transmission tower of claim 7, wherein the number of cable-stayed insulators is one, the composite cross arm further comprising:

the mounting plate is used for being mounted on the tower body;

the lightning arrester and the low-voltage end of the cable-stayed insulator are connected with the mounting plate.

10. The power transmission tower of claim 1, wherein the lightning arrester comprises:

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 two ends of the core rod, and the connecting fitting is electrically connected with the lightning arrester core body, wherein 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.