RU184101U1 - Item complete transitional supporting cable-air (PKPO-KV) - Google Patents

Abstract

The utility model relates to transitional supports of 110 kV power lines, includes building structures and electrical equipment, and is used to transfer an overhead power line (OHL) to an underground cable line. The technical result of the claimed utility model is the creation of a comprehensive unified solution for the transition of a single-circuit, two-chain, three-chain, four-chain overhead line to a cable line on a VL support, which allows to optimize technical and economic costs when organizing transitions. The complete transitional support cable-air item (PKPO-KV) contains a rack of at least two telescopically connected sections and several tiers of traverses. The upper tier of the traverse is a linear traverse for suspension of linear wires using tension insulating suspensions (garlands). The middle tiers are combined traverses, on which, in addition to the attachment points of the insulating suspensions (garlands) of wires, there are platforms for cable terminations. On the lower tier there are traverses of the cable end sleeve with platforms for cable end connectors.

Description

The utility model relates to the field of electrical engineering, in particular to transition points for power lines.

State of the art

Known transitional support of power lines [RU 2316637, publ. 02.10.2008], intended for the transition of overhead lines of PO kV into a cable line, and overhead power transmission line with a transition support [RU 57324, publ. 10/10/2006]. In known solutions, the transition support is represented in the form of a lattice metal system consisting of three sections and a traverse fixed to it with tension insulating garlands, cable sleeves and surge arresters (surge arresters).

The disadvantage of this solution is the low manufacturability of the installation due to the lattice structure of the support, as well as increased land allocation. In addition, this solution contains only building structures, not including electrical components, which increases the material, technical and economic costs during the transition.

Known transitional support of power lines [RU 103683, publ. 04/20/2011]. In this solution, the support is designed to transfer two 110 kV overhead lines to an underground cable line. The design includes a multifaceted rack, consisting of at least three docking sections, a traverse for a three-tier suspension of wires, a horizontal installation and operational platform for cable line equipment.

The disadvantage of this solution is the presence of a large site, which houses all electrical equipment, and which should have a certain strength, which increases the total mass of the support. Also, the design is complicated by the use of additional insulating elements for supplying the cables from the wires to the cable terminations located on a special site at a considerable distance from the wires. In addition, this solution contains only building structures, not including electrical components, which increases the material, technical and economic costs during the transition.

Known transitional support of power lines [RU 132467, publ. 09/20/2013]. In this solution, the support is designed to transfer four 110 kV overhead lines to an underground cable line. The design is presented in the form of a steel support of a portal type, containing two multifaceted racks interconnected by two horizontal and one flexible cross-connection, a traverse for suspension of tension insulating garlands of wires and a platform for installing cable line equipment.

The disadvantage of this solution is the increased land allocation, the complexity of installation due to the large number of structural elements, as well as the economically inefficient use of this solution to transfer fewer circuits, due to the lack of modernization of the design. In addition, this solution contains only building structures, not including electrical components, which increases the material, technical and economic costs during the transition.

Utility Model Disclosure

The technical result of the claimed utility model is the creation of a comprehensive unified solution for the transition of a single-circuit, double-circuit, three-chain, four-chain overhead line to a cable line on the overhead line support, which allows optimizing technical and economic costs when organizing transitions.

The subject of the utility model is the complete transitional support cable-air (PKPO-KV) item containing a rack of at least two docked (mainly telescopically) sections and several tiers of traverses: the upper tier of the traverse is a linear traverse for hanging linear wires using tension insulating pendants (garlands); the middle tiers are combined traverses, on which, in addition to the attachment points of the insulating suspensions (garlands) of wires, there are platforms for cable terminations; on the lower tier there are traverses of the end cable sleeve with platforms for the cable end connectors. Sections and traverses are made multifaceted in the form of truncated pyramids of steel sheet.

Traverses have the same length, due to which a vertical-row arrangement of wires is provided, the disadvantage of which is the reduction of spans, for which PKPO-KV is possible. To eliminate this drawback, thereby increasing the spans, a modification is possible with horizontal displacement of the middle traverses relative to the upper and lower traverses.

PKPO-KV modifications with cable-resistant are available for fastening one or two lightning-protective cables, as well as modifications without cable-resistant (for overhead lines without lightning-protective cables). In the presence of a cable rack, it is attached to the PKPO-KV rack using a flange connection.

The specified technical result is achieved by the fact that in PKPO-KV in a complete delivery there are:

steel structures (support strut; traverses depending on the number of chains; cable resistance depending on the number of cables; cable ladder for cable fastening with ensuring the required intervals between fastening points; ladders; platforms for fastening cable terminations; protective sheet metal sheet; fasteners );

used to organize the transition of the overhead line to the cable necessary electrical equipment (end cable sleeves complete with hardware clamps; non-linear surge suppressors (OPN) in suspended version with a set of fittings and a ground loop; end boxes for grounding cable shields complete with a grounding wire);

unified cable position fixing elements (cable ties) for all proposed cables of the considered voltage class;

foundation for the PKPO-KV stand (designed for concrete design depending on the geological data of the construction site; in the basic version, screw multi-blade piles of the type with a steel grill are used).

The complete set PKPO-KV without foundation is possible.

The utility model has been developed to optimize the design of the multifaceted PKPO-KV rack by using the concept of effective (reduced) sections. The results of the calculation using the effective cross-sectional method have been repeatedly tested by full-scale tests of multifaceted supports and allow the use of supports with a smaller wall thickness, which reduces the total weight of the support and reduces the final cost of PKPO-KV.

The utility model has a development consisting in the fact that a single-post steel multifaceted support is used as a PKPO-KV rack. At the same time, the overhead line runs along the shortest distance, taking into account the minimization of alienated land, cutting clearings in the stands; with the integrated use of the security zone, approaching roads and existing overhead lines to an acceptable distance in extremely saturated communications.

The utility model has a development consisting in the fact that the cable end sleeves are located on special platforms at an angle of 30 ° to the vertical. This development provides a reduction in cable kinks after exiting the cable end to a vertical position on the cable ladder, thereby reducing the number of elements designed to fix the cable.

In addition, this location of the cable end sleeves eliminates the need to use supporting garlands for the cable loop when approaching the cable end sleeve, which complicates the design. In this case, the cable loop is attached to the hardware clamp of the cable end sleeve in compliance with all the required insulation distances, which ensures the safe lifting to the support without disconnecting the overhead line.

The utility model has been developed to provide the required intervals between cable attachment points throughout the length of the cable line from the cable end to the cable running underground. This is done by fixing the cable with the help of a factory specialized product (cable clamp) directly at the exit of the cable from the cable end sleeve, as well as on the cable ladder.

The cable ladder consists of profiles on which holes are provided for attaching cable ties for cables of all known diameters of this voltage class without making any changes to the design of PKPO-KV.

In the place where the required interval between the cable attachment points (at the lower cable traverses) is not provided, special consoles and profiles are installed to fix it, as well as a rotary plate that changes the position of the cable clamp (angle of rotation), depending on the diameter of the cable, its transition to a vertical position on the cable ladder.

The utility model has a development consisting in the fact that overhead arresters are used to protect cable terminations from surge surges. This allows you to reduce the size of the traverses, their departure, while maintaining the required insulation distances from current-carrying and non-current-carrying parts to grounded structural elements, which ultimately leads to a decrease in the total mass of the structure.

The utility model has a development aimed at ensuring the safety of operating personnel, people and animals near PKPO-KV, as well as the safety of cable lines. Ensuring the safety of people and animals is achieved by ensuring low resistance of the PKPO-KV grounding device (no more than 0.5 Ohm) and isolation of current-carrying parts or taking them to a safe distance.

The safety of cable lines is ensured by the presence of a protective casing located at the base of the PKPO-KV support and covering cable descents up to a height of 3 m above ground level. The casing protects the cables from mechanical damage and vandalism.

The utility model has a development consisting in the fact that the design of PKPO-KV is optimized and consists of unified catch and elements. In particular, the hardware clamp used (the unit for connecting the overhead line to the end cable sleeve) is a single product that simplifies installation and further operation compared to the "prefabricated" clip consisting of two "blade clamps" (for the wire and the ferrule tip). In addition, this clamp eliminates the occurrence of electrochemical corrosion "aluminum-copper".

The right choice of the types of equipment used ensures their compatibility, ease of use and reliable operation.

The design of PKPO-KV provides for unified attachment points for various elements (for example, cable end sleeves; cable fasteners) allowing the use of a wide range of electrical equipment. The distance between the supporting insulators of the base plate of the end cable sleeve has been unified, which varies depending on the manufacturer.

All PKPO-KV units, both general and more private, allow using the equipment on the market suitable for the required conditions without making additional changes to the design.

In FIG. Figure 1 shows an example of a two-chain design PKPO-KV-110 (with traverses of the same length), with a cable-resistance for attaching two lightning protection cables (front view). In FIG. 2 is a side view.

In FIG. 1 and FIG. 2 are shown:

1 - lower section of the rack;

2 - the upper section of the rack;

3 - cable resistant;

4 - traverses of the lower tier (traverses of the cable box);

5 - traverses of the middle tier 1 (traverse of the lower phases of the wire);

6 - traverses of the middle tier 2 (traverses of the middle phases of the wire);

7 - traverse of the upper tier (traverse of the upper phases of the wire);

8 - cable traverses;

9 - a ladder;

10 - site for mounting end cable sleeves;

11 - cable end sleeves;

12 - surge suppressors non-linear;

13 - cable mounts (clamps);

14 - a protective casing;

15 - insulating wire pendants (not included in the configuration of PKPO-KV-110);

16 - cable ladder.

The complete transitional supporting cable-to-air item PKPO-KV-110 contains a rack of two telescopically connected sections 1, 2 and four tiers of traverses. The upper tier of the traverse is a traverse 7 for suspension of linear wires using tension insulating pendants (garlands) 15. The two middle tiers are combined traverses 5, 6, on which, in addition to the attachment points of insulating suspensions (garlands) of wires 15, there are platforms for terminal cable sleeves 10. On the lower tier there are traverses of the cable end sleeve 4 with platforms 10 for the cable end sleeves 11.

Suspension of two lightning protection cables on cable traverses 8 is provided, which are attached to the cable rack 3. The cable rack 3 is connected to the upper section 2 using a flange connection.

The cable end sleeves 11 are located on special platforms 10 at an angle of 30 ° to the vertical. This reduces the kink of the cable after exiting the end of the cable box 11 to a vertical position on the cable ladder 16, thereby reducing the number of elements designed to fix the cable. The cable is fastened at regular intervals using cable ties 13 on the cable ladder 16. A similar cable clamp 13 is used to fix the cable at the exit from the end sleeve.

To protect the cable end sleeves 11 from surge overvoltages, non-linear 12 overvoltage arresters are used. This allows you to reduce the size of the traverse, their departure, while maintaining the required insulation distances from current-carrying and non-current-carrying parts to grounded structural elements.

To ensure safe lifting onto the support for the purpose of installation, maintenance, and repair, a ladder 9 is used. In addition, traverses 5, 6, 7 are equipped with safety handrails for safe work.

Protection of cable lines from mechanical damage and vandalism is provided by the presence of a protective casing 14 located at the base of the PKPO-KV support.

Claims (25)

1. A cable-air transition point comprising a rack and several tiers of traverses, the upper tier of the traverse being linear traverses for suspending linear wires using tension insulating suspensions, the middle tiers being combined traverses on which fastening units for insulating suspensions for wires are located and platforms for cable terminations, the lower tier being the traverse of the cable termination with platforms for cable terminations. 2. The transition point according to claim 1, characterized in that the rack uses a single-column steel multifaceted support, and the rack consists of at least two sections. 3. The transition point under item 1, characterized in that the sections are joined telescopically. 4. The transition point under item 1, characterized in that the insulating suspension is a string of insulators. 5. A transition point according to claim 1, characterized in that the sections and traverses are made multifaceted in the form of truncated pyramids from a steel sheet. 6. Transitional point under item 1, characterized in that the traverses have the same length. 7. A transition point according to claim 1, characterized in that the middle yokes are offset horizontally relative to the upper and lower yokes. 8. The transition point under item 1, characterized in that it contains a cable rack for attaching one, two or more lightning protection cables. 9. The transition point according to claim 8, characterized in that the cable rack is attached to the rack using a flange connection. 10. The transition point according to claim 1, characterized in that it comprises a cable ladder for securing the cable. 11. The transition point according to claim 1, characterized in that it contains non-linear surge arresters. 12. The transition point according to claim 11, characterized in that the non-linear surge arresters are suspended. 13. The transition point under item 1, characterized in that it contains a ground loop. 14. The transition point according to claim 1, characterized in that it contains end grounding boxes of the cable shields. 15. The transition point according to claim 14, characterized in that the end grounding boxes of the cable shields are equipped with a grounding wire. 16. The transition point under item 1, characterized in that the end cable sleeves are located on the sites at an angle of 30 ° to the vertical. 17. The transition point according to claim 1, characterized in that it is arranged to fix the cable when the cable exits the cable end sleeve. 18. The transition point according to p. 10, characterized in that it is made with the possibility of fixing the cable on the cable ladder. 19. The transition point under item 1, characterized in that it is made with the possibility of fixing the cable using a cable tie. 20. The transition point under item 10, characterized in that the cable ladder consists of profiles on which holes are provided for attaching cable clamps. 21. The transition point according to claim 1, characterized in that for fixing the cable, special consoles and / or profiles and / or a rotary plate are installed, made with the possibility of changing the position and / or angle of rotation of the cable clamp. 22. The transition point under item 1, characterized in that it contains a grounding device with a low resistance, for example, not more than 0.5 Ohms. 23. The transition point under item 1, characterized in that the live parts are isolated or carried away from the remaining parts to a safe distance. 24. The transition point under item 1, characterized in that it contains a protective casing located at the base of the support and made with the possibility of closing cable descents to a height of 3 m above ground level. 25. The transitional point under item 1, characterized in that it contains unified nodes and elements.

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