CN107294034A - cable terminal pole - Google Patents

Abstract

The invention provides a cable terminal rod, which includes a rod body and a cross-arm assembly installed on the upper end of the rod body. The cross-arm assembly includes at least three layers of cross-arm structures, and each layer of cross-arm structures in the three-layer cross-arm structure is used to connect overhead wires And the jumper connected to the cable terminal, the three-layer cross-arm structure is the lower-layer cross-arm structure, the middle-layer cross-arm structure and the upper-layer cross-arm structure from bottom to top. The layered cross-arm structure connects three-phase staggered overhead conductors. By making the cross-arms for connecting jumpers in each layer of cross-arm structure and the cross-arms for connecting jumpers in the cross-arm structure of other layers form an angle between each other, it can be realized by only one rod body. The cross-arms of each layer connecting the jumpers are located on different vertical planes, so that the corresponding jumpers are staggered in space to avoid short-circuit or failure of the transmission line. At the same time, a rod body has a small footprint, is convenient for construction, and has low cost The advantages.

Description

cable terminal rod

technical field

The invention relates to the technical field of power transmission lines, in particular to a cable terminal rod.

Background technique

With the rapid development of the current social economy, due to the disadvantages of large space occupation and poor environmental appearance of overhead transmission lines, cable lines are gradually replacing overhead lines in urban areas and become the main transmission form of urban high-voltage transmission lines . At present, 220kV and above transmission lines located in the suburbs mostly adopt the form of overhead transmission, and those located in the urban areas of large and medium-sized cities mainly adopt the form of cable transmission, and the connection structure of 220kV overhead lines and cable lines is the weak point of the current high-voltage transmission network, which directly affects the city. Whether the transmission line can run normally and stably, the connection structure between the existing 220kV overhead line and the cable line is generally the connection between the cable and the angle steel tower. This connection method occupies a large area and has high construction requirements, which directly affects the progress of the project.

The patent document with the publication number CN203951149U discloses a 220kV double-circuit cable terminal rod and a corresponding power transmission system. The root rods are connected to form a double-rod structure. The cross-arm includes upper, middle and lower cross-arms. The upper cross-arm is installed on the longer rod, the middle cross-arm is installed on the uppermost connecting beam, and the lower cross-arm is installed on the shorter rod. Above; the overhead conductors are connected to the tension strings on the cross-arm, and jump-connected to the upper lead strings. The upper lead strings are connected to the cable terminals through the leads, and the cable terminals are placed on the cable terminal brackets. Each end of the cross-arm is connected to a tension Since the cable terminal rod is suitable for connecting double-circuit three-phase overhead conductors, the upper, middle and lower cross-arms are connected with six overhead conductors and six lead wires, and the six lead wires are respectively connected to the six sets of cable terminal brackets. The six cable terminals are connected, and the six cable terminals are respectively connected with six cables to complete the final conversion between overhead conductors and cables.

The scheme disclosed in the above-mentioned patent documents uses cable terminal rods to realize the connection between 220kV overhead lines and cable lines. Although it reduces the floor space and construction difficulty compared with the traditional angle steel tower connection method, in order to avoid short circuits and failures, double The lead wires corresponding to the three-phase overhead conductors of the loop need to be staggered in space, and the crossarms connected to the three-phase overhead conductors of each circuit should also be located in different vertical planes in space. The beam connects the long and short poles to form a double pole structure. The upper cross arm is installed on the longer pole, the middle cross arm is installed on the uppermost connecting beam, and the lower cross arm is installed on the shorter pole. The three-layer cross-arms connected by the three-phase overhead conductors are divided into different vertical planes in space. Although this structure can realize the three-layer cross-arms in different vertical planes in space, it needs to set up two rods The two rod bodies are connected by connecting beams, which requires a large floor area, inconvenient construction and high cost.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to overcome the defects of large floor area, inconvenient construction and high cost of the cable terminal pole in the prior art, so as to provide a small floor space, convenient construction and low cost. Cable termination rod.

A cable terminal rod according to the present invention comprises a rod body and a cross-arm assembly installed on the upper end of the rod body, the cross-arm assembly includes at least three layers of cross-arm structures, and each layer of the three-layer cross-arm structure The cross-arm structures are respectively used to connect the overhead conductors and the jumpers connected to the cable terminals. The three-layer cross-arm structure is the lower-layer cross-arm structure, the middle-layer cross-arm structure and the upper-layer cross-arm structure from bottom to top. The cross-arms used to connect the jumpers in the cross-arm structure and the cross-arms used to connect the jumpers in the cross-arm structures of other layers form an angle between each other, and the angle is not 0 degrees and 180 degree.

The upper cross-arm structure includes at least one upper overhead cross-arm for connecting overhead wires and at least one upper cable cross-arm for connecting the jumper wires; the middle layer cross-arm structure includes at least one middle overhead cross-arm for connecting overhead wires and at least one middle cable cross-arm for connecting the jumper; the lower cross-arm structure includes at least one lower cross-arm, and the lower cross-arm is simultaneously used for connecting overhead conductors and the jumper;

Two pairs of the upper cable cross arm, the middle cable cross arm and the lower cross arm form an angle, and the angle is not 0 degrees and 180 degrees.

The upper overhead cross-arm, the middle overhead cross-arm and the lower overhead cross-arm are on the same vertical plane.

The upper cross-arm structure includes two upper overhead cross-arms and two upper cable cross-arms;

The middle-level cross-arm structure includes two middle overhead cross-arms and two middle cable cross-arms;

The lower cross-arm structure includes two lower cross-arms.

The two upper overhead cross-arms, the two middle overhead cross-arms and the two lower cross-arms are respectively colinearly installed on the rod body, and the upper overhead cross-arms, the middle overhead cross-arms The shoulder and the lower cross arm are in the same vertical plane;

The two upper cable cross arms are located on one side of the vertical plane, and the two middle cable cross arms are located on the other side of the vertical plane.

There is a 60-degree angle between the two upper cable cross-arms, and a 60-degree angle between each of the upper cable cross-arms and the adjacent upper aerial cross-arm.

There is a 60-degree angle between the two middle cable cross-arms, and a 60-degree angle between each of the middle cable cross-arms and the adjacent middle aerial cross-arm.

The pole body is further equipped with a top cross-arm structure above the upper cross-arm structure, and the top cross-arm structure includes at least one top cross-arm for connecting with an overhead ground wire.

One end of the jumper is connected to the corresponding cross-arm through a jumper string, and the other end is connected to the cable terminal assembly, which includes a lightning arrester, an insulator, and a cable terminal connected to a cable. electrical connection between.

The cable terminal head is installed on the cable terminal support, the arrester is installed on the arrester support, the insulator is installed on the insulator support, and the cable terminal support, the arrester support and the insulator support are collinear.

The technical solution of the present invention has the following advantages:

1. The cable terminal rod provided by the present invention comprises a rod body and a cross-arm assembly installed on the upper end of the rod body, the cross-arm assembly includes at least three layers of cross-arm structures, and each layer of the three-layer cross-arm structure The cross-arm structures are respectively used to connect the overhead conductors and the jumpers connected to the cable terminals. The three-layer cross-arm structure consists of the lower cross-arm structure, the middle-layer cross-arm structure and the upper-layer cross-arm structure from bottom to top. Each layer of cross-arm Structurally, one phase of overhead conductors is respectively connected, so that the three-layer cross-arm structure connects three-phase staggered overhead conductors. By making the cross-arms for connecting the jumpers in the cross-arm structure of each layer and the cross-arms for connecting the jumpers in the cross-arm structures of other layers form an angle between each other, and The angle is not 0 degrees and 180 degrees, and the cross-arms of each layer used to connect the jumper can be divided into different vertical planes through only one rod body, so that the three-phase overhead conductors connected to the three-layer cross-arm can The corresponding jumpers are staggered in space, which can effectively avoid short circuit or failure of the transmission line. At the same time, compared with the existing two pole bodies or angle steel towers, one pole body has the advantages of small footprint, convenient construction and low cost.

2. In the cable terminal pole provided by the present invention, the upper cross-arm structure includes two upper overhead cross-arms and two upper cable cross-arms; the middle cross-arm structure includes two middle overhead cross-arms and the two middle cable cross arms; the lower cross arm structure includes two lower cross arms. In this way, the cross-arms connected to the overhead conductors can be divided into two groups, and each group includes an upper overhead cross-arm, a middle overhead cross-arm and a lower cross-arm, so that when only one group is connected to a three-phase overhead conductor, it can be Realize the connection of single-circuit three-phase overhead conductors. When each of the two groups is connected with one-return three-phase overhead conductors, the two groups can realize the connection of double-circuit six-phase overhead conductors, that is, the cable terminal rod provided by the present invention can be applied to The connection between single-circuit three-phase overhead conductors and cable lines can also be applied to the connection between double-circuit six-phase overhead conductors and cable lines, and has a wide range of applications.

3. In the cable terminal rod provided by the present invention, the two upper overhead cross arms, the two middle overhead cross arms and the two lower cross arms are respectively colinearly installed on the rod body, and the The upper overhead cross-arm, the middle overhead cross-arm and the lower cross-arm are in the same vertical plane; by setting the two upper cable cross-arms on one side of the vertical plane, the two middle The cable cross-arm is arranged on the other side of the vertical plane, so that the vertical plane where each upper cable cross-arm is located is not coplanar with the vertical plane where each middle cable cross-arm is located , at the same time, the same vertical plane where the upper overhead cross-arm, the middle overhead cross-arm and the lower cross-arm are located is the same as the plane where each upper cable cross-arm is located, and the plane where each middle cable cross-arm is located The planes are not coplanar, so that there is no interference between the jumpers of each phase, between the jumper and the overhead conductor, and the possibility of short circuit and other faults is reduced. At the same time, this method has a simple structure, saves space, and is convenient for construction. The advantages.

4. The cable terminal pole provided by the present invention, the cable terminal head is installed on the cable terminal support, the lightning arrester is installed on the lightning arrester support, the insulator is installed on the insulator support, by connecting the cable terminal support, the The collinear arrangement between the lightning arrester pillar and the insulator pillar not only can further save the floor space, but also has a tidy and beautiful effect.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the three-dimensional schematic view of the connection of the cable terminal pole to the single-circuit three-phase overhead conductor provided in the first embodiment of the present invention;

Fig. 2 is a three-dimensional schematic diagram of connecting the double-circuit six-phase overhead conductor with the cable terminal rod shown in Fig. 1;

Explanation of reference signs:

1-rod body, 211-top overhead cross arm, 212-upper cable cross arm, 221-middle overhead cross arm, 222-middle cable cross arm, 23-lower cross arm, 24-top cross arm, 3-jumper, 4 -tension string, 5-jumper string, 61-cable terminal head, 62-insulator, 63-arrester, 7-cable terminal bracket, 8-arrester support, 9-insulator support, 10-overhead wire, 20-overground Wire.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

As shown in Figures 1 and 2, this embodiment provides a cable terminal rod, which is suitable for the connection of high voltage, especially 220kV and above, overhead lines and cable lines, including a rod body 1 and a cross arm installed on the upper end of the rod body 1 Assemblies, the cross-arm assembly includes at least three layers of cross-arm structures, each layer of the cross-arm structures in the three-layer cross-arm structure is respectively used to connect the overhead conductor 10 and the jumper wire 3 connected to the cable terminal, the The three-layer cross-arm structure is the lower-layer cross-arm structure, the middle-level cross-arm structure and the upper-layer cross-arm structure from bottom to top. In the cross-arm structure, the cross-arms used to connect the jumper 3 form an angle between each other, and the angle is not 0 degrees and 180 degrees.

In this embodiment, by making the cross arm used to connect the jumper 3 in the cross arm structure of each layer and the cross arm used to connect the jumper 3 in the cross arm structure of other layers Two pairs of each other are at an angle, and the angle is not 0 degrees and 180 degrees. Only one rod body 1 can be used to realize the different vertical planes of the cross-arms of each layer used to connect the jumper 3, so that it can be connected with The jumpers 3 corresponding to the three-phase overhead conductors 10 connected by the three-layer cross-arm are staggered in space, which can effectively avoid the short circuit or failure of the transmission line. It has the advantages of small area, convenient construction and low cost.

As a specific implementation, in the embodiment, the upper cross-arm structure includes two upper overhead cross-arms 211 connected to the overhead conductors 10 and two upper cable cross-arms 212 for connecting the jumper wires 3; The middle-level cross-arm structure includes two middle overhead cross-arms 221 for connecting the overhead conductors 10 and two middle cable cross-arms 222 for connecting the jumper wires 3; the lower-level cross-arm structure includes two lower cross-arms 23 , the lower cross arm 23 is simultaneously used to connect the overhead conductor 10 and the jumper wire 3; the upper cable cross arm 212, the middle cable cross arm 222 and the lower cross arm 23 are mutually at an angle , and the angle is not 0 degrees and 180 degrees. In this way, the cross-arms connected with the overhead conductor 10 can be divided into two groups, and each group includes an upper overhead cross-arm 211, a middle overhead cross-arm 221 and a lower cross-arm 23, so that when only one group is connected to a three-phase overhead When the wire 10 is used, it can be connected to a single-circuit three-phase overhead wire. When each of the two groups is connected to a three-phase overhead wire 10, the two groups can be connected to a double-circuit six-phase overhead wire, which is the cable provided in this embodiment. The terminal rod can be applied to the connection between single-circuit three-phase overhead conductors and cable lines (as shown in Figure 1), and can also be applied to the connection between double-circuit six-phase overhead conductors and cable lines (as shown in Figure 2). Wide range.

As an alternative embodiment, it is also possible that the upper cross-arm structure includes one upper overhead cross-arm 211 and one upper cable cross-arm 212; the middle cross-arm structure includes one middle overhead cross-arm 221 and a middle cable cross arm 222; the lower cross arm structure includes a lower cross arm 23, which constitutes a set of cross arms connected with the three-phase overhead conductor 10, which can be applied to single-circuit three-phase overhead conductors Connection to cable lines.

In this embodiment, the two upper overhead cross arms 211, the two middle overhead cross arms 221 and the two lower cross arms 23 are respectively installed on the rod body 1 collinearly, and the The upper overhead cross arm 211, the middle overhead cross arm 221 and the lower cross arm 23 are in the same vertical plane; the two upper cable cross arms 212 are located on one side of the vertical plane, and the two The middle cable cross arm 222 is located on the other side of the vertical plane. In this way, the vertical plane where each of the upper cable cross arms 212 is located is not coplanar with the vertical plane where each of the middle cable cross arms 222 is located, and at the same time, the upper overhead cross arms 211, The same vertical plane where the middle overhead cross-arm 221 and the lower cross-arm 23 are located is not coplanar with the plane where each upper cable cross-arm 212 is located and the plane where each middle cable cross-arm 222 is located, Therefore, there is no interference between the jumper wires 3 of each phase, and between the jumper wires 3 and the overhead conductors 10, effectively avoiding the possibility of short circuit and other failures. At the same time, this method has the advantages of simple structure, space saving, and convenient construction .

The angle between the two upper cable cross arms 212, the angle between each upper cable cross arm 212 and the adjacent upper aerial cross arm 211, the two middle cable cross arms 222 The size of the angle between them, and the angle between each of the middle cable cross arms 222 and the adjacent middle overhead cross arms 221 can be selected according to specific conditions. In this embodiment, the two upper cable cross arms 212 form an angle of 60 degrees, and each of the upper cable cross arms 212 and the adjacent upper aerial cross arms 211 also form an angle of 60 degrees. . An angle of 60 degrees is formed between the two middle cable cross arms 222 , and an angle of 60 degrees is also formed between each of the middle cable cross arms 222 and the adjacent middle aerial cross arms 221 . This angle size is more neat and beautiful.

In this embodiment, the pole body 1 is further equipped with a top cross-arm structure above the upper cross-arm structure, and the top cross-arm structure includes two top cross-arms 24 for connecting with the overhead ground wire 20 . In the embodiment of the connection between the single-circuit three-phase overhead conductor and the cable line, the top cross-arm structure may also include a top cross-arm 24 for connecting with the overhead ground wire 20 .

In this embodiment, the overhead conductors 10 are connected to the corresponding cross arms through tension strings 4 . One end of the jumper 3 is connected to the corresponding cross arm through the jumper string 5, and the other end is connected to the cable terminal head assembly, and the cable terminal head assembly includes a lightning arrester 63, an insulator 62 and a cable terminal connected with a cable Head 61, arrester 63, insulator 62 and cable terminal head 61 are electrically connected among the three.

The cable terminal head 61 is installed on the cable terminal support 7, the lightning arrester 63 is installed on the lightning arrester support 8, the insulator 62 is installed on the insulator support 9, the cable terminal support 7, the lightning arrester support 8 and the The insulator pillars 9 are collinear. This collinear setting method can not only further save the occupied space, but also has a tidy and beautiful effect.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. A cable terminal rod, comprising a rod body (1) and a cross-arm assembly installed on the upper end of the rod body (1), the cross-arm assembly comprises at least three layers of cross-arm structure, and the three-layer cross-arm structure The cross-arm structure of each layer is respectively used to connect the overhead conductor (10) and the jumper wire (3) connected to the cable terminal, and the three-layer cross-arm structure is the lower-layer cross-arm structure and the middle-layer cross-arm structure from bottom to top. And the upper stratum cross-arm structure, it is characterized in that, the cross-arm for connecting the jumper (3) in the cross-arm structure of each layer is used to connect the jumper (3) in the cross-arm structure of other layers 3) Two pairs of cross-arms form an angle with each other, and the angle is not 0 degrees and 180 degrees. 2. The cable termination rod according to claim 1, characterized in that, The upper cross-arm structure includes at least one upper overhead cross-arm (211) connected to the overhead wire (10) and at least one upper cable cross-arm (212) for connecting the jumper (3); the middle-level cross-arm The structure includes at least one middle overhead cross-arm (221) for connecting the overhead wire (10) and at least one middle cable cross-arm (222) for connecting the jumper (3); the lower cross-arm structure includes at least one lower A cross arm (23), the lower cross arm (23) is simultaneously used for connecting the overhead wire (10) and the jumper wire (3); Two pairs of the upper cable cross arm (212), the middle cable cross arm (222) and the lower cross arm (23) form an angle, and the angle is not 0 degrees and 180 degrees. 3. The cable terminal pole according to claim 2, characterized in that, the upper overhead cross arm (211), the middle overhead cross arm (221) and the lower cross arm (23) are in the same vertical Straight plane. 4. The cable termination rod according to claim 2, characterized in that, The upper cross-arm structure includes two upper overhead cross-arms (211) and two upper cable cross-arms (212); The middle-level cross-arm structure includes two middle overhead cross-arms (221) and two middle cable cross-arms (222); The lower cross-arm structure includes two lower cross-arms (23). 5. The cable termination rod according to claim 4, characterized in that, The two upper overhead cross-arms (211), the two middle overhead cross-arms (221) and the two lower cross-arms (23) are respectively collinearly installed on the rod body (1), and The upper overhead cross arm (211), the middle overhead cross arm (221) and the lower overhead cross arm (23) are on the same vertical plane; The two upper cable cross arms (212) are located on one side of the vertical plane, and the two middle cable cross arms (222) are located on the other side of the vertical plane. 6. The cable terminal rod according to claim 5, characterized in that, an angle of 60 degrees is formed between the two upper cable cross arms (212), and each of the upper cable cross arms (212) is adjacent to each other. Also form an angle of 60 degrees between the described upper overhead cross-arms (211). 7. The cable terminal pole according to claim 5 or 6, characterized in that, an angle of 60 degrees is formed between two said middle cable cross arms (222), and each said middle cable cross arm (222) is connected to The adjacent middle overhead cross arms (221) also form an angle of 60 degrees. 8. The cable terminal rod according to any one of claims 1-7, characterized in that, the rod body (1) is also equipped with a top cross-arm structure above the upper cross-arm structure, and the top layer The cross-arm structure includes at least one top cross-arm (24) for connecting with the overhead ground wire (20). 9. The cable terminal rod according to any one of claims 1-8, characterized in that one end of the jumper (3) is connected to the corresponding cross arm through a jumper string (5), and the other end One end is connected with a cable terminal head assembly, and the cable terminal head assembly includes a lightning arrester (63), an insulator (62) and a cable terminal head (61) connected with a cable, and the three are electrically connected. 10. The cable terminal rod according to claim 9, characterized in that, the cable terminal head (61) is installed on the cable terminal bracket (7), the lightning arrester (63) is installed on the lightning arrester support (8), The insulator (62) is installed on the insulator support (9), and the cable terminal support (7), the lightning arrester support (8) and the insulator support (9) are collinear.