RU2316637C1 - Crossing power transmission pole - Google Patents

Abstract

FIELD: building structures, particularly crossing piles for 110 kV power transmission lines adapted to provide passage from overhead transmission line into underground cable one.

SUBSTANCE: crossing pile comprises lower trapezoid section installed on foundation and upper section connected to lower one. Crossing pole also has ground cable peak. Secured to upper section are aligned cross-bars arranged in several layers. Power line wire lead is formed in each cross-bar. Beam carrying cable sleeve and excess-voltage suppressor is secured to each cross-bar. Cable lead-in is connected to pole members. Upper layer consists of linear cross-bars provided with power line wire leads formed at ends thereof. Number of aligned cross-bars is defined by total number of power line wires. Lower layer includes cable cross-bars. Each cross-bar supports beam carrying cable sleeve and excess-voltage suppressor. Power line wire lead-in members of linear and aligned cross-bars, as well as beams connected to aligned and cable cross-bars are correspondingly arranged in staggered order. Holders for cable position fixation in turning areas and fixing members to secure cable at pole faces are installed in cable lead-in direction.

EFFECT: possibility of cable leading out to any pole face, possibility of optimal cable installation regardless of consumer location, increased cable montage quality and extended span between the poles.

5 cl, 7 dwg

Description

Technical field

The invention relates to building structures, namely to transitional supports of 110 kV power lines, and can be used to switch from an overhead line to an underground cable line.

State of the art

The growth of large cities is associated with the ongoing compaction of buildings and the maximum use of free land. The reduction in the number of vacant plots and their high cost are prerequisites for the release of land for the construction occupied by previously constructed overhead lines through the construction of cable lines. The cost of land released in this case may exceed the cost of laying underground cable lines. To transition from overhead lines to cable lines, transitional supports are required on which air installation is carried out - uninsulated wire connection from the power wire to the electric cable box and cable installation - cable wiring from the electric cable box over the surface of the pylon to the underground trench.

Known transitional support of the power line for the transition from the overhead line to the cable [Series 3.407.1 143. Issue 2 "Reinforced concrete supports on 10 kV overhead lines", 1989]. The transition support contains a rack, in the upper part of which there are two traverses for attaching wires to the power line on them. Below the traverse on the brackets are mounted elements of electrical overhead installation - three surge arresters. A cable box is located even lower, which is attached directly to the support by means of metal structures. The cable from the cable box is laid down along the surface of the support and fastened to it using female brackets. Due to the fact that the support is designed for voltages up to 10 kV, the wires of the power circuit that are used for aerial installation of connections from insulators through surge arresters to the electrical coupling, as well as the cable, have a small cross section and, as a result, are highly flexible. In addition, a sufficiently low network voltage allows the use of small air gaps during installation. All this allows you to output the power cable to either side of the support. Thus, the minimum cable length is ensured, and the area occupied by underground utilities when laying the cable from the support to the consumer is also reduced.

Known transitional double-circuit transmission line support company ABB [prospectus of the company, 2005], designed for a voltage of 110 kV. The support comprises a lower trapezoidal section, an upper section and a cable rack. Three power wires are connected and secured through insulator strings to each of two linear traverses located on the same tier on opposite sides of the support, which ensures horizontal-row fastening of power wires. A linear traverse is understood to mean a traverse, to which a power linear wire coming from a power plant is attached through insulators. Cable traverses are installed below the linear traverses, which are used to attach air and cable mounting elements to them. Three grating beams are fixed on each of the cable traverses, at the ends of which a surge suppressor and an electric coupling are attached.

The disadvantage of this design is that the horizontal-in-line arrangement of power wires on the linear traverses and, as a result, the horizontal-in-line arrangement of surge arresters and cable sleeves on cable traverses located below the linear traverses do not provide a large span between the supports. In addition, the dimensions of these cable traverses practically do not differ from the dimensions of linear traverses, which leads to a heavier structure.

The descents of electrical cables (cable-management mounting elements) from each of the cable joints to the cable entry into the ground are made using special clamps that are attached directly to the support elements (braces, braces, etc.). Such fastening ensures the output of cables only to the front side. The face perpendicular to the direction of the power wires of the overhead line is taken as the front face.

Fastening the cable directly to the structural elements of the support does not provide high quality cable installation, as it does not guarantee the required mounting interval, which is strictly regulated, especially for vertical installation. The structural elements of the support (braces, stops) have a spatial arrangement determined by the structural features of the support, which may not coincide with the required intervals for fastening the cable. In addition, such cable fastening does not allow all cables to be brought out to one of the side faces of the support. So, for example, a cable for voltage of 110 kV has a bending radius of at least 1 m, and cables for a higher voltage of more than 1.5 m. It is not possible to lay a cable from one side to another (bend by 90 degrees). As a result, a change in the direction of cable laying, determined by the location of the consumer, is provided by the configuration of the underground trench, which leads to an increase in cable length, as well as to inefficient use of land.

The closest in technical essence is the transitional double-circuit support of 110 kV of the company Energosetproekt [Prospectus of the company, 2006]. This transitional support of power lines includes a lower trapezoidal section mounted on a foundation, an upper section fastened with it and a cable rack, traverses are fixed in tiers on the upper section, and the traverses located on the three lower tiers are combined. At the end of each combined traverse, through the garlands of insulators, a power linear wire is inserted, and with an offset to the center of the support, a lattice beam is installed on it, on which are located the surge suppressor and cable sleeve used for aerial installation and the beginning of cable installation, the cable run is fixed to the support elements .

A feature of this design is that all these elements are used for aerial installation and the beginning of cable installation from the power wire that came to the same combined cross-beam.

The descents of electrical cables (cable fasteners) from each cable gland to the cable entry into the ground are made using special clamps that are attached directly to the support elements (braces, braces, etc.).

Fastening the cable directly to the structural elements of the support does not provide high quality fasteners. The structural elements of the support (braces, stops) have a spatial arrangement determined by the structural features of the support, which may not coincide with the required intervals for cable fastening, which are strictly regulated, especially for vertical cable installation. Such cable fastening also does not allow the cable to be led to the edge of the support directed at a particular consumer. For example, a cable with 110 kV SPE insulation has a bend radius of about 1 m, and cables with a higher voltage exceed 1.5 m. It is not possible to lay a cable from one side to another (bend by 90 degrees). The direction of cable laying, determined by the location of the consumer, is provided by the configuration of the underground trench, which leads to an increase in cable length, as well as inefficient use of land.

In addition, the disadvantage of this design is the inability to provide a large span between the supports, since the inputs of all power wires are made at the ends of the combined traverses having the same length. The vertically in-line configuration of the arrangement thus formed significantly reduces the permissible span between the supports.

Disclosure of invention

The basis of the invention is the task of ensuring the possibility of outputting the cable to any of the faces of the support, improving the quality of cable installation, as well as increasing the length of the span between the supports.

The problem is solved in that in the transitional support of power lines, including the lower trapezoidal section mounted on the foundation, the upper section and the cable rack fastened to it, combined traverses are fixed in tiers on the upper section, on each of which a power linear wire is inserted and the beam is fixed, on of which a cable sleeve and surge suppressor are installed, and the cable run is connected to support elements, according to the invention, the upper tier consists of linear traverses at the ends of which power line wires are not inserted, the number of combined traverses is determined by the total number of power linear wires, and the lower tier consists of cable traverses, on each of which a beam is mounted on which a cable sleeve and surge suppressor are installed, and power linear wires inputs on linear and combined traverses and also the beams on the combined and cable traverses are staggered, respectively, along the cable descent, brackets are installed to fix the position of the cable on rad turning angles and tray elements for fixing the cable on the edges of the support.

Wherein:

- a tier of cable traverse can be installed on the lower trapezoidal section of the support;

- tray elements are made of ladder type and are attached to the support with the help of covering marks;

- the dimensions of the sections of the tray elements are selected depending on the type of cable;

- the number of brackets is selected depending on the required mounting intervals and the length of the cable release.

The implementation of the lower tier of cable traverses, and supplying the supports with brackets for fixing the position of the cable at turning radii established along the cable descent, made it possible to bend the cable on the descent and the possibility of fastening it to the bending radii at a distance of not more than 1 meter. This interval of cable fastening allows you to take into account the spatial arrangement of the structural elements of the support, improve the quality of cable installation and provide the ability to bring the cable to any face of the support, which will ensure optimal cable management regardless of the location of the consumer.

The location of the inputs of the power linear wires on the linear and combined traverses, respectively in a checkerboard pattern, allowed to separate the wires of different phases to the maximum possible distance and thereby increase the distance between the supports in the power line.

Fastening the cable to the ladder-type metal trays, equipped with cross-bars located every meter, made it possible to optimally fasten the cable, and fastening the trays to the support using covering marks allows the use of cables of various grades and diameters without significant alterations to the support.

Brief Description of the Drawings

Figure 1 presents a General view of the front face of a single-chain support;

figure 2 is a side view;

figure 3 is an isometric view of the support with cable mounting on the front face of the support;

figure 4 is an isometric view of the support with cable mounting on the side face of the support;

Figures 5 and 6 show a common front face of a double-chain support;

in Fig.7 shows the elements of fastening the cable to the support and to the trays.

The implementation of the invention

Statics.

Transitional single-chain support of power lines (Figs. 1-4) with three power wires contains a lower trapezoidal section 1 mounted on a foundation, an upper section 2 and a cable rack 3. Each of sections 1, 2 and 3 consists of belts, reinforced by braces and braces. On the upper section 2, two linear traverses 4, a combined traverse 5, two cable traverses 6 and brackets 7 are fixed. Linear traverses 4 are used to fasten the bushings 8 of the power linear wires 9 through the garlands of insulators 10 and cables. On the combined traverse 5 and cable traverses 6, lattice beams 11 are strengthened, at the ends of which cable sleeves 12 and surge arresters 13 are installed. The combined traverse 5 is used for fastening the bushings 8 of the power line wires 9 and cable-air mounting, and cable traverses 6 are used for cable-air mounting.

Transitional double-chain support (Fig. 5) with six power wires contains a trapezoidal lower section 1 mounted on the foundation, an upper section 2 and a cable rack 3. Each of the sections 1, 2 and 3 consists of belts reinforced by braces and braces. On the upper section 2, linear traverses 4 are fixed, combined traverses 5, cable traverses 6 and brackets 7. All traverses are fixed in tiers, one below the other. The first (upper) tier is composed of linear traverses 4. The second and third (middle) tiers, the number of which depends on the total number of power wires 8, are made on the basis of combined traverses 5. The lower fourth tier is made on the basis of cable traverses 6. The lower fourth tier of cable traverses 6 can be placed on the lower trapezoidal section 1 (Fig.6).

Inputs of power wires 8 are made at the ends of linear traverses 4 and upper combined traverses 5. At combined traverses 5 of the third tier, the inputs of power wires are made in the middle, thus achieving the maximum possible distance between wires of different phases.

Cable descent (cable mounting fasteners) from the cable mounting point 14 in the cable sleeve 12 to the cable 14 entering the ground is carried out using a number of fastening units and elements. Directly at the points of attachment of the cable sleeves 12, slopes 15 are made on the trellised beam to ensure vertical cable arrangement. For the possibility of intermediate fastening of the power cable 14 at the radii of the bend when it approaches the edges of the support, brackets 7 are made of corners on bolted joints. The power cable 14 is attached to the bracket 7 using brackets 16 with insulating (polyvinyl chloride) gaskets 17 (Fig. 7). At intersections with the support belts, the possible fastening of the power cable 14 is carried out through the grasping marks 18, consisting of a corner and a bracket of a round profile. The slopes of the power cable 14 along the edge of the support are made according to the chute elements 19, 20 and 21. The chute elements 19, 20 and 21 are made of ladder type and consist of vertical guides 22, which are used for fastening to the structural elements of the support (braces, braces), and horizontal cross members 23 for fastening the power cable 14. Vertical guides 22 are attached to the support elements using fixing covering marks 18. The distance between the cross members 23 is selected from the required fastening interval for the power cable 14, which depends from the brand of cable. The power cable 14 is fixed to the crossbars 23 using brackets 24. The total number of tray elements, as well as the number of sections of the tray elements, are determined by the height of the support and its profile.

In the lower part of the power cable 14 is protected by a metal box 25. Fastening the box 25 to the lower tray 21 bolted. A polyethylene pipe 26 is attached to the lower section of the tray 19, into which the cables 14 are inserted to transfer to the underground concrete cable tray 27.

Claims (5)

1. Transitional support of power lines, including the lower trapezoidal section mounted on the foundation, the upper section fastened with it and the cable rack, combined traverses are fixed in tiers on the upper section, on each of which a power line wire is inserted and a beam is mounted on which a cable sleeve is installed, surge suppressor, and cable descent connected with support elements, characterized in that the upper tier consists of linear traverses, at the ends of which bushings of power linear wires are made, to The number of combined traverses is determined by the total number of power linear wires, and the lower tier consists of cable traverses, on each of which a beam is mounted, on which a cable sleeve and surge suppressor are installed, and the inputs of power linear wires on linear and combined traverses, as well as beams on combined and cable traverses are staggered respectively, along the cable descent, brackets are installed to fix the position of the cable at turning radii and tray elements for cable fixing on the sides of the support. 2. The transitional support according to claim 1, characterized in that the tier of the cable traverse can be installed on the lower trapezoidal section of the support. 3. The transitional support according to claim 1, characterized in that the tray elements are made of ladder type and are attached to the support with the help of covering marks. 4. The transitional support according to claim 1 or 2, characterized in that the dimensions of the sections of the tray elements are selected depending on the type of cable. 5. The transition support according to claim 1, characterized in that the number of brackets is selected depending on the required mounting intervals and the length of the cable release.

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