A 35kV four-circuit cable terminal tower and installation method thereof

Abstract

The application discloses a 35kV same-tower four-loop cable terminal tower and a mounting method thereof, which comprises a terminal tower body, the bottom of the terminal tower body is provided with three-core cables, four sides of the upper side of the terminal tower body are respectively provided with a group of overhead lines, four sides of the bottom of the terminal tower body are respectively provided with three-core cables, four sides of the terminal tower body are respectively provided with support assembly through clamping structures, the three-core cables and the overhead lines are respectively installed and supported on the terminal tower body through the support assembly, and the upper ends of the four groups of overhead lines are extended to the same side of the terminal tower body. The application does not need to open holes in the tower body, has no influence on the structural strength of the tower body, the tower body will not be corroded and shortened in service life due to the fact that the corrosion prevention of the punching position is not in place, the installation is simple, the applicability is strong, and the operation and maintenance are convenient.

Description

Technical Field

[0001] This invention relates to the field of overhead power transmission line technology, and in particular to a 35kV four-circuit cable terminal tower on the same tower and its installation method. Background Technology

[0002] New energy projects, especially large-scale wind and solar power bases, are often located in sparsely populated areas, but power transmission corridor resources are equally valuable. Multi-circuit transmission on the same tower can significantly reduce the number of tower foundations and the width of the transmission corridor, which is crucial for coordinating project land use with ecological protection, such as avoiding basic farmland and ecological red lines. Although the cost of a single tower for multi-circuit transmission is slightly higher, it effectively controls the overall investment of the project and improves economic efficiency by reducing land acquisition and demolition costs, compressing corridor clearing costs, and reducing the overall amount of terminal tower foundation work. It can also solve the problem of limited corridor space to some extent. Therefore, the advantages of multi-circuit transmission on the same tower are becoming increasingly apparent in large-capacity projects such as large-scale wind and solar power bases.

[0003] Cable mounting devices are an indispensable part of the design of 35kV overhead power collection lines for large-scale wind and solar power bases. Existing research mainly focuses on cable mounting devices for single-circuit and double-circuit terminal towers. Multi-circuit terminal towers still require multiple terminal towers to complete the unloading of all circuit cables, increasing cable investment, land occupation, and construction difficulty. Moreover, most devices require bolt installation after drilling holes in the terminal tower members, which is inconvenient. If adjustments are needed based on actual site conditions during construction, re-drilling is required, affecting the construction schedule.

[0004] For example, Chinese patent document CN108418167A discloses a four-circuit single-line cable terminal tower, which includes a tower body and four transmission lines; a square mounting platform is installed around the lower section of the tower body; the transmission lines of the first, second, third and fourth transmission lines are respectively led down from the front, rear, left and right sides of the tower body and connected to the cable heads on the mounting platform. Its advantages are: by installing a square installation platform around the lower section of the tower, each transmission line is led down and connected to the cable head of the installation platform, thereby reducing the connection points between the transmission line and the cable, shortening the cable length, avoiding the need for excessive clamps when laying cables at high altitudes, and reducing the load on the tower. Its disadvantages are: the transmission line is directly installed on the tower through composite supports. When installing the composite supports, holes need to be drilled in the tower, which reduces the structural strength of the tower. Furthermore, if adjustments are needed according to the actual site conditions during construction, holes need to be drilled again, which not only affects the construction schedule, but also damages the original anti-corrosion coating of the steel at the drilling site, making the drilling site prone to rust and shortening the service life of the tower. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a 35kV four-circuit cable terminal tower and its installation method, which does not require drilling holes in the tower body, has higher tower body structural strength, and will not have its service life shortened by rust due to drilling. The installation is simple, the applicability is strong, and the operation and maintenance are convenient.

[0006] To achieve the above objectives, this application provides a 35kV four-circuit cable terminal tower, including a terminal tower body. A three-core cable is installed at the bottom of the terminal tower body, and a set of overhead conductors is installed on each of the four sides of the upper side of the terminal tower body. A three-core cable is installed on each of the four sides of the bottom of the terminal tower body, and a bracket assembly is clamped and installed on each of the four sides of the terminal tower body by a clamping structure. The three-core cable and the overhead conductors are respectively installed and supported on the terminal tower body by the bracket assembly, and the upper ends of the four sets of overhead conductors all extend to the same side of the terminal tower body.

[0007] The terminal tower body is divided into a first section, a second section, a third section, and a fourth section from bottom to top; the support assembly includes a first support, a second support, a third support, a fourth support, a fifth support, and a sixth support. The first bracket is installed on each of the four sides of the lower end of the first section of the terminal tower body. Cable protection pipes are installed on the first brackets, and three-core cables pass through the cable protection pipes. The upper part of the first section is equipped with a second bracket, and the upper part of the three-core cable is fixed on the second bracket. The second section is equipped with a third bracket around its perimeter. The third bracket is used to fix each single-phase cable in the three-core cable. Each single-phase cable is connected to the cable terminal on the upper side of the third bracket, and the cable terminal is connected to the overhead conductor on the upper side. The overhead conductors extend to the same side of the terminal tower body through the fourth, fifth, and sixth supports.

[0008] The lower end of the third section is equipped with a fourth bracket, and several post insulators are installed on the fourth bracket extending outward. Several overhead conductors are installed on the post insulators respectively. Several layers of fifth supports are installed around the upper side of the third section, and several post insulators are installed on the fifth supports extending outward. Several layers of sixth supports are installed around the upper side of the fourth section, and several post insulators are installed on the sixth supports. Four sets of overhead conductors are installed sequentially on the post insulators from bottom to top, eventually extending to the same side of the terminal tower body.

[0009] The fourth support is also equipped with a surge arrester and a counter. The overhead conductor is electrically connected to the surge arrester, and the surge arrester is electrically connected to the counter.

[0010] The clamping structure includes a support rod, a first clamping member, and a second clamping member. The first clamping member is fixed to the side of one end of the support rod. The two ends of the second clamping member are respectively installed on the first clamping member by bolts. The first clamping member and the second clamping member are used to clamp the terminal tower body. The other end of the support rod is provided with several mounting holes for mounting and fixing the bracket assembly by bolts.

[0011] The first bracket includes a first support rod, on which a first U-bolt is mounted, the first U-bolt being used to fix the cable protection pipe; The second bracket includes a second support rod, on which a second U-bolt is mounted for securing the three-core cable.

[0012] The third bracket includes two third support rods, which are connected and fixed together by several first connecting rods. Three third U-bolts are installed at intervals on the outer third support rod, and the third U-bolts are used to fix the single-phase cable.

[0013] The fourth support includes two fourth support rods, which are connected and fixed together by at least three second connecting rods. Three first mounting holes are provided at intervals on the outer end face of the outer fourth support rod, which are used to install post insulators. Three counter mounting plates are provided at intervals on the top surface of the outer fourth support rod, which are used to install counters. A surge arrester mounting position is provided on the second connecting rod, which is used to install surge arresters.

[0014] The fifth bracket includes a fifth support rod, and three second mounting holes are spaced apart on the outer end face of the fifth support rod. The second mounting holes are used to install post insulators. The sixth bracket includes a sixth support rod, and a plurality of third mounting holes are provided at intervals on the outer end face of the sixth support rod. The third mounting holes are used to install post insulators.

[0015] The installation method applied to the aforementioned 35kV four-circuit cable terminal tower includes the following steps: S1. Bracket assembly installation: Connect the bracket assembly to the clamping structure with bolts, and the clamping structure is fixed to the terminal tower body with bolts. S2. Electrical equipment installation: surge arresters, counters and post insulators are installed on the corresponding bracket assemblies by bolts, and three-core cables and single-phase cables are fixed on the corresponding bracket assemblies; S3. Connection of electrical equipment to overhead conductors: surge arresters, counters and single-phase cables are connected to overhead conductors through clamps. The overhead conductors are fixed by post insulators and led up to the vicinity of the conductor hanging point, and then connected to the overhead line through T-type clamps.

[0016] Compared with the prior art, the above-conceptual technical solution conceived in this application has the following beneficial effects: In this invention, four three-core cables and an overhead conductor are respectively supported on the terminal tower body by bracket assemblies. Clamping structures are installed at both ends of the bracket assemblies by bolts. The clamping structures are clamped on the terminal tower body by bolts. Therefore, there is no need to drill holes in the tower body, which has no impact on the structural strength of the tower itself. The tower will not rust and shorten its service life due to inadequate anti-corrosion at the drilling points. The installation is simple, the applicability is strong, the bracket assemblies can be replaced individually, and the operation and maintenance are convenient. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 This is a side view of the structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the first support in this invention.

[0021] Figure 4 This is a schematic diagram of the structure of the second support in this invention.

[0022] Figure 5 This is a schematic diagram of the structure of the third support in this invention.

[0023] Figure 6 This is a schematic diagram of the structure of the fourth support in this invention.

[0024] Figure 7 This is a schematic diagram of the structure of the welding counter mounting plate on the fourth bracket in this invention.

[0025] Figure 8 This is a schematic diagram of the structure of the fifth support in this invention.

[0026] Figure 9 This is a schematic diagram of the sixth support structure in this invention.

[0027] Figure 10 This is a schematic diagram of the clamping structure in this invention.

[0028] Figure Labels Terminal tower body 100, first section 101, second section 102, third section 103, fourth section 104; First bracket 110, first support rod 111, first U-bolt 112; Second bracket 120, second support rod 121, second U-bolt 122; Third bracket 130, third support rod 131, first connecting rod 132, third U-bolt 133; Fourth bracket 140, fourth support rod 141, second connecting rod 142, first mounting hole 143, surge arrester mounting position 144, counter mounting plate 145; Fifth bracket 150, fifth support rod 151, second mounting hole 152; Sixth bracket 160, sixth support rod 161, third mounting hole 162; Clamping structure 170, support rod 171, first clamping member 172, second clamping member 173, bolt 174, mounting hole 175. Three-core cable 200, cable protection conduit 210, single-phase cable 220. Overhead conductor 300, Phase A conductor 310, Phase B conductor 320, Phase C conductor 330; 1. Post insulator, 2. Surge arrester, 3. Counter, 4. Cable terminal. Detailed Implementation

[0029] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0030] Regarding the explanation of terminology: In this application, "and / or" is used to describe the relationship between related objects, covering three possible situations: taking "A and / or B" as an example, it can indicate the situation where only A exists, A and B exist simultaneously, or only B exists; the symbol " / " indicates the "or" relationship between related objects, such as "A / B" which refers to A or B.

[0031] Regarding the description of the embodiments: The terms "exemplary" and "for example" appearing in this application are only used to illustrate the technical solutions through specific examples. It should be particularly emphasized that any implementation method or design scheme marked as "exemplary" or "for example" should not be construed as having an advantage over other solutions. Such expressions are only used to present the technical concepts more intuitively.

[0032] Example 1: See Figure 1 , 2This embodiment provides a 35kV four-circuit cable terminal tower, including a terminal tower body 100. A three-core cable 200 is provided at the bottom of the terminal tower body 100. A set of overhead conductors 300 is installed on each of the four sides of the upper side of the terminal tower body 100. A bracket assembly is clamped and installed on each of the four sides of the terminal tower body 100 by a clamping structure 170. The three-core cable 200 and the overhead conductors 300 are respectively supported on the terminal tower body 100 by the bracket assembly. The upper ends of the four sets of overhead conductors 300 all extend to the same side of the terminal tower body 100.

[0033] In this invention, the three-core cable 200 and the overhead conductor 300 are respectively supported on the terminal tower body 100 by bracket assembly. The two ends of the bracket assembly are respectively equipped with clamping structures 170 by bolts. The clamping structures 170 are clamped on the terminal tower body 100 by bolts. Therefore, there is no need to drill holes in the tower body, the tower body structure is stronger, the tower body will not have its service life shortened by rust due to drilling, the installation is simple, the applicability is strong, the bracket assembly can be replaced individually, and the operation and maintenance are convenient.

[0034] Specifically, see Figure 1 The terminal tower body 100 is divided into a first section 101, a second section 102, a third section 103 and a fourth section 104 from bottom to top; the support assembly includes a first support 110, a second support 120, a third support 130, a fourth support 140, a fifth support 150 and a sixth support 160, and clamping structures 170 are respectively installed at both ends of the first support 110, the second support 120, the third support 130, the fourth support 140, the fifth support 150 and the sixth support 160 by bolts.

[0035] See Figure 1 The first bracket 110 is installed on the four sides of the lower end of the first section 101 of the terminal tower body 100. The cable protection pipe 210 is installed on the first bracket 110, and the three-core cable 200 passes through the cable protection pipe 210.

[0036] The upper part of the first section 101 is equipped with a second bracket 120, and the cable terminal at the upper end of the three-core cable 200 is fixed on the second bracket 120.

[0037] The second section 102 is surrounded by a third bracket 130. The third bracket 130 is used to fix each single-phase cable 220 in the three-core cable 200. Each single-phase cable 220 is connected to the cable terminal 4 on the upper side of the third bracket 130. The cable terminal 4 is connected to the overhead conductor 300 on the upper side.

[0038] The overhead conductor 300 extends to the same side of the terminal tower body 100 via the fourth support 140, the fifth support 150 and the sixth support 160.

[0039] The lower end of the third section 103 is equipped with a fourth bracket 140. Several post insulators 1 are installed on the fourth bracket 140, and several overhead conductors 300 are installed on the post insulators 1 respectively.

[0040] Several layers of fifth supports 150 are installed around the upper side of the third section 103, and several post insulators 1 are installed on the fifth supports 150 extending outward.

[0041] Several layers of sixth brackets 160 are installed around the upper side of the fourth section 104, and several post insulators 1 extend from the sixth brackets 160.

[0042] Four sets of overhead conductors 300 are installed sequentially from bottom to top on the post insulators 1, eventually extending to the same side of the terminal tower body 100.

[0043] Each of the four sets of overhead conductors 300 includes an A-phase conductor 310, a B-phase conductor 320, and a C-phase conductor 330, which are respectively fixed on the post insulator 1.

[0044] See Figure 1 , 2 The fourth bracket 140 is also equipped with a surge arrester 2 and a counter 3. The overhead conductor 300 is electrically connected to the surge arrester 2, and the surge arrester 2 is electrically connected to the counter 3.

[0045] See Figure 10 The clamping structure 170 includes a support rod 171, a first clamping member 172, and a second clamping member 173. The first clamping member 172 is fixed to the side of one end of the support rod 171. Both ends of the second clamping member 173 are respectively mounted on the first clamping member 172 by bolts 174. The first clamping member 172 and the second clamping member 173 are used to clamp the terminal tower body 100. The other end of the support rod 171 is provided with several mounting holes 175 for mounting and fixing the bracket assembly with bolts. During installation, the support rod 171 is bolted to the first bracket 110, the second bracket 120, the third bracket 130, the fourth bracket 140, the fifth bracket 150, and the sixth bracket 160 through the mounting holes 175. The support rod 171 can be extended as needed.

[0046] See Figure 3 The first bracket 110 includes a first support rod 111, on which a first U-bolt 112 is mounted. The first U-bolt 112 is used to fix the cable protection pipe 210.

[0047] See Figure 4 The second bracket 120 includes a second support rod 121, on which a second U-bolt 122 is mounted. The second U-bolt 122 is used to fix the three-core cable 200.

[0048] See Figure 5 The third bracket 130 includes two third support rods 131, which are connected and fixed by a number of first connecting rods 132. Three third U-bolts 133 are installed at intervals on the outer third support rod 131. The third U-bolts 133 are used to fix the single-phase cable 220.

[0049] See Figure 6 The fourth bracket 140 includes two fourth support rods 141, which are connected and fixed together by at least three second connecting rods 142. Three first mounting holes 143 are spaced apart on the outer end face of the outer fourth support rod 141 for mounting the post insulator 1. Three counter mounting plates 145 are spaced apart on the top surface of the outer fourth support rod 141. (See also...) Figure 7 The counter mounting plate 145 is used to mount the counter 3, and the second connecting rod 142 is provided with a surge arrester mounting position 144, which is used to mount the surge arrester 2. The mounting positions of the surge arrester 2 and the counter 3 are as follows: Figure 1 , 2 As shown in the image.

[0050] See Figure 8 The fifth bracket 150 includes a fifth support rod 151. Three second mounting holes 152 are spaced apart on the outer end face of the fifth support rod 151. The second mounting holes 152 are used to mount the post insulator 1. The screw of the post insulator 1 passes through the second mounting holes 152 and is then screwed onto a nut.

[0051] See Figure 9 The sixth bracket 160 includes a sixth support rod 161. A plurality of third mounting holes 162 are provided at intervals on the outer end face of the sixth support rod 161. The third mounting holes 162 are used to install the post insulator 1.

[0052] Example 2: This embodiment also provides an installation method for a 35kV four-circuit cable terminal tower, including the following steps: S1. Bracket assembly installation: Connect the bracket assembly to the clamping structure 170 with bolts. The clamping structure 170 is clamped and fixed to the terminal tower body 1 with bolts.

[0053] Specifically, clamping structures 170 are bolted to both ends of the first bracket 110, the second bracket 120, the third bracket 130, the fourth bracket 140, the fifth bracket 150, and the sixth bracket 160.

[0054] S2. Electrical equipment installation: Surge arrester 2, counter 3 and post insulator 1 are installed on the corresponding bracket assembly by bolts, and three-core cable 200 and single-phase cable 220 are fixed on the corresponding bracket assembly.

[0055] Specifically, a counter 3 is installed on the counter mounting plate 145 of the fourth bracket 140, and a surge arrester mounting position 144 is provided on the second connecting rod 142, on which a surge arrester 2 is installed. The second bracket 120 fixes the three-core cable 200 with the second U-bolt 122. The third bracket 130 fixes the three single-phase cables 220 with the third U-bolt 133.

[0056] S3. Connection of electrical equipment to overhead conductor 300: surge arrester 2, counter 3 and single-phase cable 220 are respectively connected to overhead conductor 300 through clamps. Overhead conductor 300 is fixed by post insulator 1 and led up to the vicinity of conductor hanging point, and connected to overhead line through T-type clamps.

[0057] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A 35kV four-circuit cable terminal tower, comprising a terminal tower body (100), a three-core cable (200) disposed at the bottom of the terminal tower body (100), and a set of overhead conductors (300) respectively installed on the four sides of the upper side of the terminal tower body (100), characterized in that: Three-core cables (200) are respectively provided on the four sides of the bottom of the terminal tower body (100). Support assemblies are clamped and installed on the four sides of the terminal tower body (100) by clamping structure (170). The three-core cables (200) and overhead conductors (300) are respectively installed and supported on the terminal tower body (100) by the support assemblies. The upper ends of the four sets of overhead conductors (300) all extend to the same side of the terminal tower body (100). The terminal tower body (100) is divided into a first section (101), a second section (102), a third section (103) and a fourth section (104) from bottom to top; the support assembly includes a first support (110), a second support (120), a third support (130), a fourth support (140), a fifth support (150) and a sixth support (160). The first bracket (110) is installed on the four sides of the lower end of the first section (101) of the terminal tower body (100). A cable protection pipe (210) is installed on the first bracket (110), and a three-core cable (200) passes through the cable protection pipe (210). The upper end of the first section (101) is equipped with a second bracket (120), and the upper end of the three-core cable (200) is fixed on the second bracket (120); The second section (102) is surrounded by a third bracket (130), which is used to fix each single-phase cable (220) in the three-core cable (200). Each single-phase cable (220) is connected to the cable terminal (4) on the upper side of the third bracket (130), and the cable terminal (4) is connected to the overhead conductor (300) on the upper side. The overhead conductor (300) extends to the same side of the terminal tower body (100) via the fourth support (140), the fifth support (150) and the sixth support (160); The clamping structure (170) includes a support rod (171), a first clamping member (172), and a second clamping member (173). The first clamping member (172) is fixed to the side of one end of the support rod (171). The two ends of the second clamping member (173) are respectively installed on the first clamping member (172) by bolts (174). The first clamping member (172) and the second clamping member (173) are used to clamp the terminal tower body (100). The other end of the support rod (171) is provided with a plurality of mounting holes (175). The mounting holes (175) are used to install and fix the bracket assembly by bolts.

2. A 35kV four-circuit cable terminal tower according to claim 1, characterized in that: The lower end of the third section (103) is equipped with a fourth bracket (140), and several post insulators (1) are installed on the fourth bracket (140) extending outward. Several overhead conductors (300) are respectively installed on the post insulators (1). Several layers of fifth supports (150) are installed around the upper side of the third section (103), and several post insulators (1) are installed on the fifth supports (150) extending outward. Several layers of sixth brackets (160) are installed around the upper side of the fourth section (104), and several post insulators (1) are installed on the sixth brackets (160). Four sets of overhead conductors (300) are installed sequentially from bottom to top on the post insulators (1) and eventually extend to the same side of the terminal tower body (100).

3. A 35kV four-circuit cable terminal tower according to claim 2, characterized in that: The fourth support (140) is also equipped with a surge arrester (2) and a counter (3). The overhead conductor (300) is electrically connected to the surge arrester (2), and the surge arrester (2) is electrically connected to the counter (3).

4. A 35kV four-circuit cable terminal tower according to claim 1, characterized in that: The first bracket (110) includes a first support rod (111), on which a first U-bolt (112) is mounted. The first U-bolt (112) is used to fix the cable protection pipe (210). The second bracket (120) includes a second support rod (121) on which a second U-bolt (122) is mounted for fixing the three-core cable (200).

5. A 35kV four-circuit cable terminal tower according to claim 1, characterized in that: The third bracket (130) includes two third support rods (131), which are connected and fixed by a number of first connecting rods (132). Three third U-bolts (133) are installed at intervals on the outer third support rod (131), and the third U-bolts (133) are used to fix the single-phase cable (220).

6. A 35kV four-circuit cable terminal tower according to claim 3, characterized in that: The fourth bracket (140) includes two fourth support rods (141), which are connected and fixed by at least three second connecting rods (142). Three first mounting holes (143) are provided at intervals on the outer end face of the fourth support rod (141) located on the outside. The first mounting holes (143) are used to install post insulators (1). Three counter mounting plates (145) are installed at intervals on the top surface of the fourth support rod (141) located on the outside. Counters (3) are installed on the counter mounting plates (145). Lightning arrester mounting positions (144) are provided on the second connecting rods (142). Lightning arresters (2) are installed on the lightning arrester mounting positions (144).

7. A 35kV four-circuit cable terminal tower according to claim 2, characterized in that: The fifth bracket (150) includes a fifth support rod (151), and three second mounting holes (152) are provided at intervals on the outer end face of the fifth support rod (151). The second mounting holes (152) are used to install the post insulator (1). The sixth bracket (160) includes a sixth support rod (161), and a plurality of third mounting holes (162) are provided at intervals on the outer end face of the sixth support rod (161). The third mounting holes (162) are used to install post insulators (1).

8. The installation method applied to the 35kV four-circuit cable terminal tower of claim 3, characterized in that: Includes the following steps: S1. Bracket assembly installation: Connect the bracket assembly to the clamping structure (170) with bolts. The clamping structure (170) is clamped and fixed to the terminal tower body (100) with bolts. S2. Electrical equipment installation: surge arrester (2), counter (3) and post insulator (1) are installed on the corresponding bracket assembly by bolts, and three-core cable (200) and single-phase cable (220) are fixed on the corresponding bracket assembly; S3. Connection of electrical equipment to overhead conductor (300): The surge arrester (2), counter (3) and single-phase cable (220) are connected to the overhead conductor (300) through clamps respectively. The overhead conductor (300) is fixed by the post insulator (1) and led up to the vicinity of the conductor hanging point. It is then connected to the overhead line through T-type clamps.

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