RU57324U1 - TRANSMISSION SUPPORT OF LINES OF ELECTRIC TRANSMISSIONS - Google Patents

Abstract

The utility model 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.

The technical result of the claimed utility model is the possibility of outputting the cable to any of the faces of the support, which will ensure optimal cable laying regardless of the location of the consumer, improving the quality of cable installation, as well as increasing the length of the span between the supports.

The specified technical result is achieved in that in the transitional support of power lines, including the lower trapezoidal section mounted on the foundation, the upper section fastened and cable-stayed with it, traverses are fixed in tiers on the upper section, one of which is combined and the power line wire is inserted on it and a beam is fixed on which a cable sleeve and surge suppressor are installed, and the cable run is connected with support elements, the upper tier consists of linear traverses, at the ends of which Linear power leads were made, cable traverses were installed on one tier with a combined traverse and on the lower tier, on each of which a beam was mounted, on which a cable sleeve and surge suppressor were installed, brackets were installed along the cable release to fix the position of the cable at turning radii and tray elements for fixing the cable on the edges of the support.

3 cp, 5 ill.

Description

The utility model 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 constantly occurring densification 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 connections 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 3.407.1143. issue 2 "Reinforced concrete supports on overhead lines 10 kV", 1989]. The transition support contains a rack, in the upper part of which there are two traverses for attaching the wires of the power line to 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. Cable box cable

is laid down along the surface of the support and is attached to it with the help of clasping 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 an electrical cable box, as well as a 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 two-pole transmission line support company ABB [company prospectus 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 provides 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 cable box are attached.

The disadvantage of this design is that the horizontal row arrangement of power wires on the linear traverses and, as a consequence, the horizontal row arrangement of surge arresters and cable sleeves on cable traverses located below the linear traverses do not provide a large span between the supports. Besides,

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 electric cables (cable installation) 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 onto one side face of the support. For example, a cable with a voltage of 110 kV has a bending radius of at least 1 m, and cables with a higher voltage exceeding 1.5 m. It is not possible to lay a cable from one side to another (bending 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 JSC Institute Energosetproekt engineering company [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 insulator strings, 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 mounting fixtures) 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.).

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 necessary 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. Inputs of all power wires are made at the ends of the combined traverses having the same length,

thus forming a vertical row arrangement of power wires. And this, in turn, significantly reduces the permissible span between the supports.

Utility Model Disclosure

The utility model is based on the task of providing the ability to output a 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, traverses are fixed in tiers on the upper section, one of which is combined and the input of the power linear wire is made on it and fixed the beam on which the cable sleeve and surge suppressor are installed, and the cable run is connected to the support elements, according to the utility model, the upper tier consists of linear traverses, at the end where the power line conductors are made, cable traverses are installed on one tier with a combined traverse and on the lower tier, on each of which a beam is mounted, on which a cable sleeve and surge suppressor are installed, brackets are installed along the cable release to fix the position of the cable at radii turning and tray elements for fixing the cable on the edges of the support.

Wherein:

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

- sizes of sections of 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.

Supplying the support with cable traverses and brackets for fixing the position of the cable at turning radii set to

the cable descent allowed to bend the cable on the descent and the ability to mount it on 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 traverse, allowed to distribute 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 metal trays, of the ladder type, equipped with crossbars 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-circuit transitional support;

figure 2 side view;

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

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

figure 5 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. 1-5) 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 with braces and struts. On the upper section 2 are fixed two linear traverses 4, a combined traverse 5, two cable traverses 6, and brackets 7. 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 to secure the input 8 of the power line wire 9 and cable-air installation, and cable traverses 6 are used for cable-air installation.

Cable descent (cable mounting fastening) from the place of fastening of cable 14 in cable sleeve 12 to the input of cable 14 into the ground is carried out using a number of mounting units and elements. Directly, in the places of attachment of the cable sleeves 12 on the trellised beam, slopes 15 are made to ensure the vertical location of the cable. 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. 5). 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 grasping marks 18. The distance between the cross members 23 is selected from the required interval for fastening the power cable 14,

which depends on 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, for passage into the underground concrete cable tray 27.

Claims (4)

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, traverses are fixed in tiers on the upper section, one of which is combined, and a power line wire is entered on it and a beam is fixed on which a cable sleeve and surge suppressor are installed, and the cable run is connected with support elements, characterized in that the upper tier consists of linear traverses, at the ends of which power line inputs are made cable wires, cable traverses are fixed on one tier with a combined traverse and on the lower tier, on each of which a beam is mounted, on which a cable sleeve and surge suppressor are installed, along the cable release brackets are installed to fix the position of the cable at turning radii and tray elements for fixing the cable on the edges of the support. 2. 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. 3. The transitional support according to claim 1, characterized in that the dimensions of the sections of the tray elements are selected depending on the type of cable. 4. 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.