CN218991090U - Composite cross arm and power transmission tower - Google Patents

Abstract

The application discloses a composite cross arm, which comprises at least one insulator and at least one arcing device connected with the insulator, wherein one end of the at least one insulator is used for being connected with a tower body of a power transmission tower and is a low-voltage end, and the other end of the at least one insulator is used as a composite cross arm for hanging an end part of a power transmission line and is a high-voltage end; each arcing device comprises a high-voltage end arcing component and a low-voltage end arcing component, wherein the high-voltage end arcing component is connected with the high-voltage end of the insulator, the low-voltage end arcing component is connected with the low-voltage end of the insulator, and the high-voltage end arcing component and the low-voltage end arcing component comprise arcing rods; the electrical gap between the high voltage end arcing component and the low voltage end arcing component of the first arcing device is smaller than the electrical gap between the high voltage end and the low voltage end of any one of the at least one insulator. The application also discloses a transmission tower, including the body of a tower and with the above-mentioned compound cross arm that the body of a tower is connected. The composite cross arm can reduce potential safety hazards of a power transmission line.

Description

Composite cross arm and power transmission tower

Technical Field

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

Background

At present, the composite cross arm with the voltage of more than 220kV is easy to generate overvoltage in the operation process. The equalizing ring installed on the existing composite cross arm only has the function of uniformly distributing electric fields, when overvoltage is generated (such as lightning stroke), high current can instantaneously flow from the hardware fitting at the high-voltage end of the insulator to the hardware fitting at the low-voltage end, the insulator is ablated, the hardware fitting is damaged, the insulator is damaged, and line safety hidden danger is generated.

Disclosure of Invention

To the not enough of prior art, one of the purpose of this application is to provide a compound cross arm, can protect all insulators through first arcing device, reduces transmission line's potential safety hazard.

In order to solve the technical problems, the technical scheme adopted by the application is as follows: the composite cross arm comprises at least one insulator and at least one arcing device connected with the insulator, wherein one end of the at least one insulator is used for being connected with a tower body of a power transmission tower and is a low-voltage end, and the other end of the at least one insulator is used as a composite cross arm and is used for hanging an end part of a power transmission line and is a high-voltage end; each arcing device comprises a high-voltage end arcing component and a low-voltage end arcing component, wherein the high-voltage end arcing component is connected with the high-voltage end of the insulator, the low-voltage end arcing component is connected with the low-voltage end of the insulator, and the high-voltage end arcing component and the low-voltage end arcing component comprise arcing rods; the electrical gap between the high voltage end arcing component and the low voltage end arcing component of the first arcing device is smaller than the electrical gap between the high voltage end and the low voltage end of any one of the at least one insulator. The electric gap between the high-voltage end arcing component and the low-voltage end arcing component of the first arcing device is smaller than the electric gap between the high-voltage end and the low-voltage end of any one insulator, so that the discharge gap between the high-voltage end arcing component and the low-voltage end arcing component of the first arcing device is broken down first under the condition of overvoltage, and the insulator can be prevented from being burnt due to the fact that large current flows from the high-voltage end to the low-voltage end of any one insulator, and therefore all insulators are protected, and potential safety hazards are reduced.

The insulator is a post insulator, one end of the post insulator is used for being connected with the tower body, and the other end of the post insulator is used as a composite cross arm for hanging the end part of a power transmission line, so that the first arcing device can protect the composite cross arm with a single-column structure, a double-column structure and the like.

The composite cross arm further comprises at least one inclined pull insulator, one ends of the support insulator and the inclined pull insulator are connected with the tower body, and the other ends of the support insulator and the inclined pull insulator are connected together to serve as the end part of the composite cross arm for hanging a power transmission line, so that the first arcing device can protect the composite cross arm with structures of single column single pull, single column double pull, single column three pull, double column double pull and the like.

Wherein, the insulator that the chute boot length is shortest among at least one insulator is connected with first and is taken the arc device. So as long as the electric gap between the high-voltage end and the low-voltage end of the arcing device connected with the first insulator is ensured to be smaller than that of the first insulator, the electric gap between the high-voltage end and the low-voltage end of the arcing device connected with the first insulator can be ensured to be smaller than that of the high-voltage end and the low-voltage end of all insulators, and the installation efficiency can be improved.

Wherein the number of the post insulators is one or two, and at least one post insulator is connected with a first arcing device. The electric gap between the high-voltage end and the low-voltage end of the first arcing device can be ensured to be smaller than the electric gap between the high-voltage end and the low-voltage end of all the post insulators, and the installation is convenient.

The number of the cable-stayed insulators is one, two or three, and at least one cable-stayed insulator is connected with a first arcing device. The electric gap between the high-voltage end and the low-voltage end of the first arcing device can be ensured to be smaller than the electric gap between the high-voltage end and the low-voltage end of all the post insulators and the cable-stayed insulators, and the installation is convenient.

Wherein the arcing rod is of a multi-section bending structure, the multi-section bending structures are sequentially and smoothly connected, the point discharge phenomenon can be reduced, the uniform distribution of the electric field is ensured,

one end of an arcing rod of the low-voltage end arcing component is connected with the insulator, and the other end of the arcing rod is used as an arcing end of the low-voltage end arcing component. The free end of the arcing rod is set as the arcing end of the low-voltage end arcing component, so that the cost can be reduced while the arcing effect is ensured.

Wherein, the arcing rod is connected with the insulator through the clamping groove fitting.

The second purpose of the application is to provide a power transmission tower, which comprises a tower body and the composite cross arm connected with the tower body.

The beneficial effects of this application are: the composite cross arm is different from the condition of the prior art, an electric gap between a high-voltage end arcing component and a low-voltage end arcing component of a first arcing device exists in at least one arcing device, the electric gap is smaller than the electric gap between the high-voltage end and the low-voltage end of all insulators, and accordingly under the overvoltage condition, a discharge gap between the high-voltage end arcing component and the low-voltage end arcing component of the first arcing device is broken down first, and the situation that a large current flows from the high-voltage end to the low-voltage end of any insulator to burn the insulators can be avoided, so that all insulators are protected, and potential safety hazards are reduced.

Meanwhile, the insulator with the shortest umbrella cover length in at least one insulator is connected with the first arcing device, so that the electrical gap between the high-voltage end and the low-voltage end of the arcing device connected with the first insulator with the shortest umbrella cover length is smaller than that of the first insulator, the electrical gap between the high-voltage end and the low-voltage end of the arcing device connected with the first insulator can be smaller than that of the high-voltage end and the low-voltage end of all insulators, and the installation is convenient.

In addition, the arc-striking ball is further arranged to serve as an arc-striking end of the high-voltage end arc-striking component, the arc-striking effect is guaranteed, meanwhile, the phenomenon of point discharge can be reduced, the uniform distribution of an electric field is guaranteed, the free end of the first arc-striking rod is additionally arranged to serve as an arc-striking end of the low-voltage arc-striking component, and equipment cost can be reduced while the arc-striking effect is guaranteed.

Drawings

In order to more clearly illustrate 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, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

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

FIG. 2 is an enlarged schematic view at A in FIG. 1;

fig. 3 is a schematic structural diagram of the arcing ball, the first arcing rod, the first clamping groove fitting, the connecting bracket and the equalizing ring in fig. 2;

FIG. 4 is an enlarged schematic view at B in FIG. 1;

fig. 5 is a schematic structural diagram of the second arcing rod and the second clamping slot hardware in fig. 4 in another application scenario;

FIG. 6 is a top view of the structure of FIG. 3;

fig. 7 is a schematic structural diagram of the high voltage end connection fitting in fig. 2;

fig. 8 is a schematic structural diagram of the low voltage end connection fitting in fig. 4;

FIG. 9 is a schematic structural view of another embodiment of a composite cross arm of the present application;

FIG. 10 is an enlarged schematic view at C in FIG. 9;

FIG. 11 is an enlarged schematic view at D in FIG. 9;

FIG. 12 is a schematic structural view of yet another embodiment of a composite cross arm of the present application;

FIG. 13 is a schematic view of the composite cross arm of FIG. 12 in another view;

fig. 14 is a schematic structural diagram of an embodiment of a power transmission tower of the present application.

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 drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but 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, in one embodiment of the present application, a composite cross arm 1000 includes at least one insulator 1100 and at least one arcing device 1200.

When the composite cross arm 1000 only comprises one insulator 1100, one end of the insulator 1100 is used for being connected with a tower body of a power transmission tower, and the other end of the insulator 1100 is used as an end part of the composite cross arm 1000 for hanging a power transmission line. When the composite cross arm 1000 includes a plurality of insulators 1100, one ends of the insulators 1100 are used for being connected with a tower body of a power transmission tower, and the other ends of the insulators are connected together through the first connecting fitting 1101 to form an end portion of the composite cross arm 1000 for hanging a power transmission line. One end of the insulator 1100 connected with the tower body is a low-voltage end, and the other end is a high-voltage end, namely, the end of the insulator 1100 used for hanging a power transmission line is the high-voltage end.

As shown in fig. 1, when the number of the insulators 1100 is plural, the plurality of insulators 1100 may include a pillar insulator 1110 and a cable-stayed insulator 1120, and one ends of the pillar insulator 1110 and the cable-stayed insulator 1120 are connected to a tower body of the power transmission tower, and the other ends are connected together through a first connection fitting 1101 to form an end portion of the composite cross arm 1000 for hanging the power transmission line.

The number of the pillar insulators 1110 and the cable-stayed insulators 1120 is not limited in the present application, and the number of the pillar insulators 1110 and the cable-stayed insulators 1120 may be one or more. For example, in fig. 1, the number of pillar insulators 1110 and cable-stayed insulators 1120 is two, i.e., the composite cross arm 1000 has a double-pillar double-pull structure. Specifically, one ends of the two pillar insulators 1110 and the two cable-stayed insulators 1120 are connected with a tower body of the transmission tower, and the other ends of the two pillar insulators 1120 are connected together to form an end portion of the composite cross arm 1000 for hanging the transmission line, wherein the two cable-stayed insulators 1120 are located on the same side of the two pillar insulators 1110 and are respectively adjacent to the two pillar insulators 1110, and an included angle between the two pillar insulators 1110 ranges from 20 ° to 50 °, for example, from 20 °, 30 °, 40 °,45 ° or 50 °, and an included angle between the pillar insulator 1110 and the adjacent cable-stayed insulator 1120 ranges from 15 ° to 45 °, for example, from 15 °, 30 ° or 45 °. The arrangement of the two pillar insulators 1110 and the two cable-stayed insulators 1120 enables the composite cross arm 1000 and the tower body of the power transmission tower to be in a stable triangular structure, and can greatly improve the stability of the composite cross arm 1000. It should be noted that, in other embodiments, the number of pillar insulators 1110 may be one, and the number of cable-stayed insulators 1120 may be three, which will be described below.

The installation heights of the two pillar insulators 1110 are the same, the installation heights of the two cable-stayed insulators 1120 are the same, and meanwhile, the two cable-stayed insulators 1120 are located above or below the two pillar insulators 1110 (in the figure, the two cable-stayed insulators 1120 are located above the two pillar insulators 1110 for illustration). And the angles between two pillar insulators 1110 and adjacent cable-stayed insulators 1120 are equal, that is, the composite cross arm 1000 is of a symmetrical structure to ensure that the composite cross arm 1000 is stressed uniformly, but the application is not limited thereto, for example, in other embodiments, the angle between one pillar insulator 1110 and the adjacent cable-stayed insulator 1120 is 20 ° and the angle between the other pillar insulator 1110 and the adjacent cable-stayed insulator 1120 is 45 °.

At least one arcing device 1200 is coupled to at least one insulator 1100. One arcing device 1200 may be connected to the same insulator 1100, or may be connected to different insulators 1100, as long as arcing components of the arcing device 1200 are located at a high-voltage end and a low-voltage end of the insulator 1100, respectively. The following description will be given of one arcing device 1200 connected to the same insulator 1100.

While each arcing device 1200 includes a high-side arcing component 1210 and a low-side arcing component 1220. The high voltage end arcing component 1210 is connected to the high voltage end of the insulator 1100, and the low voltage end arcing component 1220 is connected to the low voltage end of the insulator 1100.

Wherein, in all the arcing devices 1200, there is at least an electrical gap between the high voltage end arcing component 1210 and the low voltage end arcing component 1220 of one arcing device 1200, which is smaller than an electrical gap between the high voltage end and the low voltage end of any one of the at least one insulator 1100, that is, smaller than an electrical gap between the high voltage end and the low voltage end of all the insulators 1100 on the composite cross arm 1000. For ease of illustration, the definition of first arcing device 1200 is set forth below: an arcing device 1200 is defined as a first arcing device 1200 if the electrical gap between the high side arcing component 1210 and the low side arcing component 1220 of the arcing device 1200 is smaller than the electrical gap between the high side and the low side of any of the at least one insulator 1100.

That is, in all the arcing devices 1200, there is at least one first arcing device 1200, the electrical gap between the high voltage end arcing component 1210 and the low voltage end arcing component 1220 of which is smaller than the electrical gap between the high voltage end and the low voltage end of all the insulators 1100, so that in the case of overvoltage, for example, when being struck by lightning, the discharge gap between the high voltage end arcing component 1210 and the low voltage end arcing component 1220 of the first arcing device 1200 is broken down first, and the insulator 1100 can be prevented from being burned by a large current flowing from the high voltage end to the low voltage end of any one of the insulators 1100, thereby protecting all the insulators 1100 and reducing the potential safety hazard.

Here, the pillar insulator 1110 may be connected to the first arcing device 1200, or the cable-stayed insulator 1120 may be connected to the first arcing device 1200.

For the insulator 1100, the electrical gap between the high voltage end and the low voltage end is equal to the length of the umbrella cover of the insulator 1100, that is, the distance between the ends of the metal attachments at the two ends of the insulator 1100, where the insulator 1100 with the shortest umbrella cover length is connected with the first arcing device 1200 in order to facilitate installation. For convenience of explanation, the insulator 1100 having the shortest umbrella length among all insulators 1100 is defined as the first insulator 1100.

Specifically, when the arcing device 1200 is installed, as long as the electrical gap between the high voltage end and the low voltage end of the arcing device 1200 connected to the first insulator 1100 is ensured to be smaller than the electrical gap between the high voltage end and the low voltage end of the first insulator 1100, the electrical gap between the high voltage end and the low voltage end of the arcing device 1200 connected to the first insulator 1100 can be ensured to be smaller than the electrical gap between the high voltage end and the low voltage end of all insulators 1100, so that when the arcing device is installed, the installation efficiency can be ensured as long as the distance between the arcing end of the high voltage end arcing component 1210 connected to the first insulator 1100 and the arcing end 1220 of the low voltage end arcing component is ensured to be smaller than the umbrella cover length of the first insulator 1100.

In this embodiment, in order to enhance the protection effect of at least one arcing device 1200 on the insulator 1100, the electrical gap between the high voltage end arcing component 1210 and the low voltage end arcing component 1220 of each arcing device 1200 is smaller than the electrical gap between the high voltage end and the low voltage end of all insulators 1100. I.e. all arcing devices 1200 are first arcing devices 1200.

Meanwhile, in the present embodiment, the length of the umbrella cover of the cable-stayed insulator 1120 is smaller than the length of the umbrella cover of the pillar insulator 1110, that is, the electrical gap between the high voltage end and the low voltage end of the cable-stayed insulator 1120 is smaller than the electrical gap between the high voltage end and the low voltage end of the pillar insulator 1110, when the cable-stayed insulator 1120 is struck by lightning, the cable-stayed insulator 1120 is hit before the pillar insulator 1110, so in order to protect the cable-stayed insulator 1120, as shown in fig. 1, the cable-stayed insulator 1120 is connected with the first arcing device 1200.

Referring to fig. 1-3, the high voltage end arcing assembly 1210 includes an arcing ball 1211 and a first arcing rod 1212, one end of the first arcing rod 1212 being connected to the insulator 1100, the other end being connected to the arcing ball 1211, the arcing ball 1211 being the arcing end of the high voltage end arcing assembly 1210.

Specifically, in consideration of the large electric field intensity at the high voltage end of the insulator 1100, the arcing ball 1211 is provided as the arcing end of the high voltage end arcing assembly 1210, so that the spherical structure can reduce the point discharge phenomenon and ensure the uniform distribution of the electric field while playing an arcing role.

Referring to fig. 1, 4 and 5, the low-voltage end arcing component 1220 includes a second arcing rod 1221, one end of the second arcing rod 1221 is connected to the insulator 1100, and the other end is used as an arcing end of the low-voltage end arcing component 1220.

Specifically, considering that the electric field intensity of the low voltage end of the insulator 1100 is small, in order to reduce the equipment cost, the arcing end of the low voltage end arcing component 1220 is provided only to function as an arcing end, and therefore the free end of the second arcing rod 1221, which is not connected to the insulator 1100, is taken as the arcing end of the low voltage end arcing component 1220.

In other embodiments, the low-voltage end arcing component 1220 may be provided without considering the cost, and the arcing ball 1211 may be used as the arcing end, as in the high-voltage end arcing component 1210.

With continued reference to fig. 1-3, in an application scenario, one end of the first arcing rod 1212 connected to the insulator 1100 is connected to a first clamping slot fitting 1213, and the first clamping slot fitting 1213 connects the first arcing rod 1212 to the insulator 1100 through the high voltage end connection fitting 1300.

The above arrangement can ensure the connection strength of the first arcing rod 1212 with the insulator 1100 and the convenience of installation.

Specifically, the first clamping groove fitting 1213 is formed with a first clamping groove 12131 into which the high voltage end connection fitting 1300 is inserted, and the first clamping groove fitting 1213 is further provided with a first through hole 12132 to lock the first clamping groove fitting 1213 with the high voltage end connection fitting 1300 through the first through hole 12132 by using a locking member such as a bolt, a rivet, or the like. Wherein the surface of the first clamping groove fitting 1213 is polished to be a smooth surface without sharp corners in order to reduce the tip discharge.

The first clamping groove fitting 1213 is provided with the first clamping groove 12131 and the first through hole 12132, so that the first clamping groove fitting 1213 and the high-voltage end connecting fitting 1300 inserted into the first clamping groove 12131 can be directly locked by utilizing the locking member to penetrate through the first through hole 12132, thereby ensuring the convenience and the strength of installation.

Wherein one end of the high voltage end connection fitting 1300 is connected with the insulator 1100, and the other end is connected with the first connection fitting 1101. The specific structure of the high voltage end connection fitting 1300 is described below.

The first arcing rod 1212 is a multi-segment bent structure, and includes a plurality of segments of first arcing segments 12121 connected in sequence, wherein in order to reduce the point discharge phenomenon, the uniform distribution of the electric field is ensured, and the segments of first arcing segments 12121 are connected in sequence smoothly.

Wherein the entire surface of the first arcing rod 1212 is a smooth surface in order to further reduce the point discharge phenomenon, ensuring a uniform distribution of the electric field. I.e., the surface of the first arcing rod 1212 is polished to avoid sharp corners.

In order to even the electric field at the high voltage end of the insulator 1100, the periphery of the high voltage end of the insulator 1100 is further provided with a grading ring 1500. Meanwhile, in order to improve the installation efficiency, the equalizing ring 1500 is connected with the first clamping groove fitting 1213 through the connecting bracket 1600, so that the first arcing rod 1212 and the equalizing ring 1500 can be installed at the same time as long as the first clamping groove fitting 1213 is connected with the insulator 1100 during installation.

The first clamping groove fitting 1213 and the equalizing ring 1500 are arranged at intervals along a first direction Q1 parallel to the extending direction of the insulator 1100, meanwhile, the equalizing ring 1500 is provided with a notch 1510, and one end of the first arcing rod 1212, which is not connected with the first clamping groove fitting 1213, is bent at the notch 1510 in a direction away from the equalizing ring 1500 and is connected with the arcing ball 1211.

Wherein, setting up equalizer ring 1500 has breach 1510, both can save material, also can avoid the arcing ball 1211 to contact with equalizer ring 1500, guarantees the arcing effect of arcing ball 1211.

In other embodiments, the equalizing ring 1500 may not have the notch 1510, as long as the arcing ball 1211 is not in contact with the equalizing ring 1500.

Referring to fig. 3 and 6, in this embodiment, in order to ensure that the first clamping groove fitting 1213 is uniformly stressed, a grading ring 1500, a connecting bracket 1600, a first arcing rod 1212 and an arcing ball 1211 are symmetrically arranged about a first plane F1; meanwhile, the first clamping groove fitting 1213 is symmetrically arranged about the second plane F2, the first plane F1 and the second plane F2 are vertically arranged, and an intersecting line of the first plane F1 and the second plane F2 coincides with the central axis L1 of the equalizing ring 1500. It can be understood that, after the first clamping groove fitting 1213 is connected with the high voltage end connection fitting 1300, the first plane F1 and the second plane F2 are parallel to the extending direction of the insulator 1100, so that the high voltage end connection fitting 1300 can be ensured to be uniformly subjected to the external force applied by the first clamping groove fitting 1213, the high voltage end connection fitting 1300 is prevented from being deformed due to uneven stress, and the service life of the high voltage end connection fitting 1300 can be prolonged. It should be noted that, the structure of the high-voltage end arcing component 1210 is not particularly limited in this application, as long as it can perform an arcing function.

With continued reference to fig. 1, 4 and 5, in the present embodiment, the second arcing rod 1221 is a multi-segment bent structure, including a plurality of segments of second arcing segments 12211 that are sequentially and smoothly connected.

Specifically, two adjacent second arc-shaped segments 12211 are smoothly connected, so that a point discharge phenomenon can be avoided, thereby ensuring uniformity of an electric field.

The shape of the second arcing rod 1221 is not limited in this application, for example, in an application scenario, the first two second arcing segments 12211 of the multiple second arcing segments 12211 are disposed at an angle (for example, 45 ° or 90 °.

In an application scenario, as shown in fig. 5, the number of the second arc-catching segments 12211 is three, where an included angle between two adjacent second arc-catching segments 12211 is an obtuse angle, for example, an included angle between two adjacent second arc-catching segments 12211 is 135 °.

Wherein, to further avoid the point discharge phenomenon, the surface of the second arcing section 12211 is polished to be a smooth surface.

Wherein, in order to ensure the connection strength of the second arcing rod 1221 with the insulator 1100 and to facilitate the installation of the second arcing rod 1221, one end of the second arcing rod 1221 connected with the insulator 1100 is connected with a second clamping groove fitting 1222, the second clamping groove fitting 1222 is used to connect the second arcing rod 1221 with the insulator 1100, specifically, the second clamping groove fitting 1222 connects the second arcing rod 1221 with the low voltage end connection fitting 1400, wherein one end of the low voltage end connection fitting 1400 is connected with the insulator 1100, and the other end is connected with the second connection fitting 1102, wherein the second connection fitting 1102 is used to connect the tower body. The specific structure of the low voltage end connection fitting 1400 is described below.

The second slot fitting 1222 may be a U-shaped slot (as shown in fig. 4) or an L-shaped slot (as shown in fig. 5), which is not limited herein.

Also, in order to reduce the tip discharge, the surface of the second clamping groove fitting 1222 is polished without sharp corners.

Referring to fig. 1, 2 and 7, both ends of the high voltage end connection fitting 1300 are provided with second through holes 1301 to connect one end of the high voltage end connection fitting 1300 with the insulator 1100 by passing through the second through holes 1301 with locking members such as bolts, rivets, etc. respectively, the other end is connected with the first connection fitting 1101, and at the same time, the extension directions of the second through holes 1301 provided at both ends of the high voltage end connection fitting 1300 are different.

Specifically, the extending directions of the second through holes 1301 provided at the two ends of the high-voltage end connection fitting 1300 are different, so that the high-voltage end connection fitting 1300 is convenient to commutate, and the insulator 1100 is more flexibly installed.

In an application scenario, as shown in fig. 7, the extending direction of the second through holes 1301 at two ends of the high voltage end connection fitting 1300 is vertical.

Of course, in other embodiments, the extending direction of the second through holes 1301 at the two ends of the high voltage end connection fitting 1300 may be the same.

With continued reference to fig. 1, 2, 3 and 7, the high-voltage end connection fitting 1300 includes a first connection plate 1310 and a first connection lug 1320.

The first connection plate 1310 is provided with a second through hole 1301 and a third through hole 1302, and the extending directions of the second through hole 1301 and the third through hole 1302 on the first connection plate 1310 are the same, wherein a locking piece penetrates through the third through hole 1302 to lock the high-voltage end connection fitting 1300 and the high-voltage end arcing component 1210; the first connection lug 1320 is connected to the first connection plate 1310, and is provided with a second through hole 1301.

Specifically, the high voltage end arcing component 1210 is locked with the high voltage end connection fitting 1300 by one locking member passing through the third through hole 1302 and the first through hole 12132 on the first clamping groove fitting 1213; the first connection plate 1310 is connected to the first connection fitting 1101 by passing another locking member through the second through hole 1301 of the first connection plate 1310, and the high voltage end arcing component 1210 is connected to the insulator 1100 by passing another locking member through the second through hole 1301 of the first connection lug 1320.

The third through holes 1302 may be one (as shown in fig. 2, the third through holes 1302 are not shown because of the shielding of the first slot fitting 1213 in fig. 2), or may be two (as shown in fig. 7), or the corresponding first through holes 12132 may be one (as shown in fig. 2) or two (as shown in fig. 3), which is not limited herein.

That is, the first connection plate 1310 is connected to the first connection fitting 1101 and the high voltage end arcing component 1210, and the first connection lug 1320 is connected to the insulator 1100.

Of course, in other embodiments, the first connection lug 1320 may be connected to the first connection fitting 1101 and the high voltage end arcing component 1210, and the first connection plate 1310 may be connected to the insulator 1100.

It should be noted that, the structure of the high voltage end connection fitting 1300 is not particularly limited in this application, as long as it can connect the high voltage end arcing component 1210 with the insulator 1100.

Referring to fig. 1, 4 and 8, the low voltage end connection fitting 1400 is provided with fourth through holes 1401 at both ends thereof, so that one end of the low voltage end connection fitting 1400 is connected with the insulator 1100 and the other end is connected with the second connection fitting 1102 by passing through the fourth through holes 1401 with locking members respectively; the extending directions of the fourth through holes 1401 provided at both ends of the low voltage end connection fitting 1400 are the same.

Of course, in other embodiments, the extending direction of the fourth through holes 1401 at the two ends of the low voltage end connection fitting 1400 may be different, so long as the connection of the insulator 1100 is facilitated, which is not limited herein.

With continued reference to fig. 1, 4 and 8, the low-voltage end connection fitting 1400 includes a second connection plate 1410 and a slot fitting 1420.

The second connecting plate 1410 is provided with a fourth perforation 1401 and a fifth perforation 1402 having the same extension direction as the fourth perforation 1401, wherein the locking member passes through the fifth perforation 1402 to lock the low voltage end connecting fitting 1400 and the low voltage end arcing component 1220; the slot metal fitting 1420 is connected to the second connection board 1410, and has a fourth through hole 1401 and a second slot 1403 into which the second connection metal fitting 1102 is inserted.

Specifically, the low voltage end arcing component 1220 is locked with the low voltage end connection fitting 1400 by one locking member passing through the fifth through hole 1402 and the second clamping slot fitting 1222; the second connection plate 1410 is connected to the insulator 1100 by passing another locking member through the fourth perforation 1401 on the second connection plate 1410, and the slot die 1420 is connected to the second connection fitting 1102 inserted into the second slot 1403 by passing another locking member through the fourth perforation 1401 on the slot die 1420.

The fifth through hole 1402 may be one (as shown in fig. 4, the fifth through hole 1402 is not shown in fig. 4 because the second slot fitting 1222 is blocked), or may be two (as shown in fig. 8), which is not limited herein.

That is, the second connection plate 1410 is connected to the insulator 1100, and the slot metal fitting 1420 is connected to the second connection metal fitting 1102.

Of course, in other embodiments, the second connection board 1410 may be connected to the second connection fitting 1102, and the slot fitting 1420 may be connected to the insulator 1100.

It should be noted that, the structure of the low voltage end connection fitting 1400 is not particularly limited in this application, as long as it can connect the low voltage end arcing component 1220 and the insulator 1100.

Referring to fig. 9 and 10, unlike the above-described embodiment, in the present embodiment, the connection bracket 2600 connected to the high-voltage end grading ring 2510 sleeved on the outer periphery of the high-voltage end of the insulator 2100 is not connected to the first clamping groove fitting 2213, and at this time, the connection bracket 2600 is directly connected to the insulator 2100, and the first clamping groove fitting 2213 is connected to the insulator 2100 through the high-voltage end connection fitting 2300, and at this time, during the assembly process, it is necessary to connect the high-voltage end grading ring 2510, the high-voltage end connection fitting 2300, and the insulator 2100, that is, the connection position of the first arcing rod 2212 and the insulator 2100, and the connection position of the high-voltage end grading ring 2510 and the insulator 2100 are different.

Referring to fig. 9 and 11, in order to uniformly apply the electric field at the low voltage end of the insulator 2100, a low voltage end equalizing ring 2520 is also sleeved on the periphery of the low voltage end of the insulator 2100. Similar to the high-voltage-end grading ring 2510 sleeved on the high-voltage end of the insulator 2100, the low-voltage-end grading ring 2520 sleeved on the low-voltage end of the insulator 2100 may be connected to the low-voltage-end arcing component 2220 or may not be connected to the low-voltage-end arcing component 2220, which is not limited herein, for example, in the application scenario of fig. 11, the low-voltage-end grading ring 2520 is directly connected to the insulator 2100, and the low-voltage-end arcing component 2220 is connected to the insulator 2100 through the low-voltage-end connecting fitting 2400.

In another embodiment, the composite cross arm comprises one post insulator and at least one cable-stayed insulator, i.e. the number of cable-stayed insulators may be one, two, three or more. One end of each pillar insulator and one end of each cable-stayed insulator are connected with the tower body of the power transmission tower, and the other ends of the pillar insulators and the cable-stayed insulators are connected together to form a composite cross arm for hanging the end part of the power transmission line.

When the number of the cable-stayed insulators is one, the composite cross arm is of a single-column single-pull structure, at the moment, the cable-stayed insulators are positioned above the pillar insulators, and the axes of the cable-stayed insulators and the axes of the pillar insulators are in the same vertical plane. When the number of the cable-stayed insulators is more than two, the composite cross arm is in a single-column double-pull structure, a single-column three-pull structure (and the like), and the like, the plurality of cable-stayed insulators are arranged at intervals around the pillar insulator, wherein the two cable-stayed insulators are positioned on the same side of the pillar insulator and are adjacent to the pillar insulator, and the included angle between the pillar insulator and the cable-stayed insulator ranges from 15 degrees to 45 degrees, for example, 15 degrees, 30 degrees or 45 degrees.

In this embodiment, the umbrella cover length of the cable-stayed insulator is less than the umbrella cover length of pillar insulator, namely the electrical gap between the high-voltage end and the low-voltage end of the cable-stayed insulator is less than the electrical gap between the high-voltage end and the low-voltage end of the pillar insulator, when suffering from lightning stroke, the cable-stayed insulator is hit before the pillar insulator, so in order to protect the cable-stayed insulator, at least one cable-stayed insulator is arranged to be connected with the first arcing device, the electrical gap between the high-voltage end and the low-voltage end of the first arcing device can be ensured to be less than the electrical gap between the high-voltage end and the low-voltage end of all the pillar insulators, and the installation is convenient.

It should be noted that, no matter the number of the cable-stayed insulators is one, two, three or more, the structure of the arc-drawing device and the connection relationship between the arc-drawing device and the composite cross arm are all universal, and the following description is specifically made with the number of the cable-stayed insulators being three.

Referring to fig. 12 and 13, in the present embodiment, the number of pillar insulators 3110 is one, and the number of cable-stayed insulators 3120 is three, wherein among the three cable-stayed insulators 3120, the axes of the two cable-stayed insulators 3120 are in the same plane as the axis of the pillar insulator 3110.

At this time, two cable-stayed insulators 3120 whose axes are in the same plane as the axis of the pillar insulator 3110 are defined as first cable-stayed insulators 3120, and the remaining cable-stayed insulators 3120 are defined as second cable-stayed insulators 3120, wherein the distances from the second cable-stayed insulator 3120 to the two first cable-stayed insulators 3120 are equal, and an angle range between the two first cable-stayed insulators 3120 is 45 ° to 90 °, for example, 45 °, 60 ° or 90 °, and an angle range between the second cable-stayed insulator 3120 and the pillar insulator 3110 is 25 ° to 45 °, for example, 25 °, 30 °, 35 ° or 45 °.

The axes of the two cable-stayed insulators 3120 and the axes of the post insulators 3110 are in the same plane, so that a stable triangle structure can be formed between the composite cross arm 3000 and the tower body of the power transmission tower, and the stability of the composite cross arm 3000 can be greatly improved.

In the present embodiment, each of the three cable-stayed insulators 3120 is connected to an arcing device 3200. The arcing device 3200 includes a high-voltage arcing assembly 3210 and a low-voltage arcing assembly 3220, the high-voltage arcing assembly 3210 has the same structure as the high-voltage arcing assembly 1210 in the foregoing embodiment, the low-voltage arcing assembly 3220 has the same structure as the low-voltage arcing assembly 1220 in the foregoing embodiment, meanwhile, the connection relationship between the high-voltage arcing assembly 3210 and the insulator 3100 is the same as the connection relationship between the high-voltage arcing assembly 1210 and the insulator 1100 in the foregoing embodiment, and the connection relationship between the low-voltage arcing assembly 3220 and the insulator 3100 is the same as the connection relationship between the low-voltage arcing assembly 1220 and the insulator 1100 in the foregoing embodiment, which will not be described herein.

In yet another embodiment, the composite cross arm may not be provided with diagonal insulators, where the composite cross arm includes only at least one post insulator, i.e., the number of post insulators may be one, two or more.

When the number of the post insulators is one, the composite cross arm is of a single-column structure, one end of the post insulator is used for being connected with a tower body of the power transmission tower, and the other end of the post insulator is used as the composite cross arm for hanging the end part of the power transmission line. The support insulator is arranged to be connected with the first arc-striking device, namely, the high-voltage end arc-striking component is connected with the high-voltage end of the support insulator, the low-voltage end arc-striking component is connected with the low-voltage end of the support insulator, the electric gap between the high-voltage end and the low-voltage end of the first arc-striking device can be ensured to be smaller than that between the high-voltage end and the low-voltage end of the support insulator, and the support insulator is protected.

When the number of the post insulators is more than two, the composite cross arm is of a double-column type (pushing) structure, one end of each of the plurality of post insulators is connected with the tower body of the power transmission tower, the other end of each of the plurality of post insulators is used as the composite cross arm for hanging the end part of the power transmission line, and the plurality of post insulators are arranged at intervals. In this embodiment, the structure and the size of a plurality of pillar insulator are the same, consequently set up at least one pillar insulator and be connected with first arc device, high-voltage end arc subassembly and pillar insulator's high-voltage end are connected, and low-voltage end arc subassembly and pillar insulator's low-voltage end are connected, can guarantee that the electric gap of the high-voltage end and the low-voltage end of first arc device is less than the electric gap of the high-voltage end and the low-voltage end of all pillar insulators, easy to assemble.

It should be noted that, no matter the number of the post insulators is one, two or more, the structure of the arcing device and the connection relationship between the arcing device and the composite cross arm are all universal, and similar to the foregoing embodiment, only the arcing device and the composite cross arm can be stably connected only by adjusting according to the structural design of the composite cross arm, which is not limited herein.

Referring to fig. 14, in an embodiment, a power transmission tower 2000 includes a tower body 2100 and a composite cross arm 2200 connected to the tower body 2100, where the composite cross arm 2200 sequentially includes three groups on the tower body 2100 from bottom to top, and the three groups of composite cross arms 2200 have the same structure as the composite cross arm in any one of the foregoing embodiments, such as a single column, a double column, a single pull, a single column, a double pull, a single column, and a triple pull, and are specifically designed according to a specific application scenario, so long as all insulators can be protected by setting a first arcing device, so as to reduce potential safety hazards of a power transmission line.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (10)

1. A composite cross arm, characterized in that: the composite cross arm comprises at least one insulator and at least one arcing device connected with the insulator, one end of the at least one insulator is used for being connected with a tower body of the power transmission tower and is a low-voltage end, and the other end of the at least one insulator is used as an end part of the composite cross arm for hanging a power transmission line and is a high-voltage end;

each arcing device comprises a high-voltage end arcing component and a low-voltage end arcing component, wherein the high-voltage end arcing component is connected with the high-voltage end of the insulator, the low-voltage end arcing component is connected with the low-voltage end of the insulator, and the high-voltage end arcing component and the low-voltage end arcing component comprise arcing rods;

an electrical gap between the high voltage end arcing component and the low voltage end arcing component of a first arcing device present in at least one of the arcing devices is smaller than an electrical gap between the high voltage end and the low voltage end of any of the at least one insulator.

2. The composite cross arm of claim 1, wherein: the insulator is a post insulator, one end of the post insulator is used for being connected with the tower body, and the other end of the post insulator is used as the composite cross arm for hanging the end part of the power transmission line.

3. The composite cross arm of claim 2, wherein: the composite cross arm further comprises at least one cable-stayed insulator, wherein one ends of the pillar insulator and the cable-stayed insulator are connected with the tower body, and the other ends of the pillar insulator and the cable-stayed insulator are connected together to serve as the composite cross arm for hanging the end part of the power transmission line.

4. The composite cross arm of claim 1, wherein: the insulator with the shortest umbrella cover length in at least one insulator is connected with the first arcing device.

5. The composite cross arm of claim 2, wherein: the number of the post insulators is one or two, and at least one post insulator is connected with the first arcing device.

6. A composite cross arm according to claim 3, wherein: the number of the cable-stayed insulators is one, two or three, and at least one cable-stayed insulator is connected with the first arcing device.

7. The composite cross arm of claim 1, wherein: the arcing rod is of a multi-section bending structure, and the multi-section bending structure is sequentially and smoothly connected.

8. The composite cross arm of claim 7, wherein: one end of the arcing rod of the low-voltage end arcing component is connected with the insulator, and the other end of the arcing rod is used as an arcing end of the low-voltage end arcing component.

9. The composite cross arm of claim 1, wherein: the arcing rod is connected with the insulator through a clamping groove fitting.

10. The utility model provides a transmission tower which characterized in that: the transmission tower comprising a tower body and a composite cross arm according to any one of claims 1-9 connected to the tower body.

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