CN105298201A - Electric-transmission-line cable-terminal three-dimensional downwards-leading device - Google Patents

Abstract

The invention relates to a three-dimensional down-leading device for a cable terminal of a power transmission line, which comprises a steel pipe rod and a cable terminal platform arranged on the side of the steel pipe rod; The three-layer cross-arms whose projections do not overlap, the three-layer cross-arms are the upper cross-arm, the middle cross-arm and the lower cross-arm respectively; the cable terminal platform includes the main pole of the cable terminal platform, which is installed on the main pole of the cable terminal platform and connected The outer end of the cross-arm corresponds to the vertically corresponding cable terminal head-arrester installation platform, and is transferred to three power lines in the vertical downward direction through the three-layer cross-arm. One end of the power cable, and the other end of the power cable is grounded. The invention can keep a sufficient safety distance between the down conductors of the overhead line, has a more harmonious and beautiful appearance, clear and convenient wiring construction, does not occupy too much land, and saves investment.

Description

Three-dimensional downconductor device for cable terminals of transmission lines

technical field

The invention relates to the technical field of power transmission and transformation engineering, in particular to a device for transferring overhead power lines to grounded power cables in power transmission line engineering.

Background technique

At present, 110kV double-circuit overhead lines are widely distributed, and in urban areas, it is often necessary to connect the overhead lines to the relevant cable terminal devices and then change them to cables into the ground. Under normal circumstances, some components are modified on the existing overhead line power towers to install corresponding jumper bar insulators, lightning arresters, cable terminals and other related devices, and the bare wires are connected to the cable terminal joints with down conductors. Since all kinds of electrical devices are installed on the pole tower, various connections need to be made between the bare wires at the same time, the appearance is not harmonious and beautiful, and at the same time, it causes a lot of inconvenience to the live overhaul, maintenance and other operations after putting into operation. In individual projects, based on the convenience of live inspection and maintenance operations, the relevant units adopt the method of establishing two base towers at the end of the overhead line, and separating one circuit of the double-circuit overhead line to a separate tower and then to the cable terminal. In this way, the corresponding investment and floor area increase, resulting in a certain waste.

Contents of the invention

The object of the present invention is to provide a three-dimensional downguide device for cable terminals of power transmission lines which saves investment and floor space and is convenient for live overhaul, maintenance and other operations.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A three-dimensional down-guide device for a cable terminal of a power transmission line, which is used to transfer an overhead power line to a grounded power cable. terminal platform;

The steel pipe pole includes a shaft arranged vertically, a three-layer cross-arm whose inner end is connected to the shaft and the projections of the axes on the cross-section of the shaft do not overlap, and the three-layer cross-arm is respectively the upper The cross arm, the middle cross arm and the lower cross arm, the outer ends of the three layers of cross arms are respectively connected to one of the power lines and the power lines are turned from a horizontal direction to a vertical downward direction;

The cable terminal platform includes a main pole of the cable terminal platform, a cable terminal head-lightning arrester installation platform installed on the main pole of the cable terminal platform and vertically corresponding to the outer ends of the three-layer cross-arm, The cross-arm is transferred to the three power lines in the vertical downward direction, respectively connected to one end of a power cable at the intersection with the cable terminal head-arrester installation platform, and the other end of the power cable is grounded.

The crossbar is a straight bar arranged horizontally, and the outer ends of the three layers of the crossbar are located in a rectangular area corresponding to the crossbar.

The angle between the projection of the axis of the upper cross arm and the axis of the middle cross arm on the section of the shaft is the same as the axis of the middle cross arm and the axis of the lower cross arm in the shaft. The included angles between the projections on the profile of the body are equal.

The included angle between the projection of the axis of the upper cross arm and the axis of the middle cross arm on the cross-section of the shaft, the axis of the middle cross arm and the axis of the lower cross arm in the shaft The included angles between the projections on the profile of the body are all 30°.

The included angle between the axis of the middle cross arm and the axis of the horizontal electric force line is a right angle.

Two groups of the three-layer cross-arms are symmetrically arranged on the body of the shaft, and each group of the three-layer cross-arms is correspondingly connected to three phase lines in a power line circuit; Cable termination platform.

The outer end of the cross arm is provided with a horizontal tension insulator string and a vertical jumper insulator string, and the power line is sequentially connected to the ends of the tension insulator string and the jumper insulator string Thereby turning from a horizontal direction to a vertical downward direction.

The three power lines that are transferred to the vertical downward direction through the three-layer cross-arm respectively pass through the transition clamp and the outdoor cable terminal head to connect the power cable correspondingly; the outdoor cable terminal head is set at the cable terminal head- The arrester is installed on the platform; each of the transition clamps is connected to a corresponding arrester through a wire, and the arrester is arranged on the cable terminal head-arrester installation platform.

Each of the power cables is connected with a grounding cable, and each of the grounding cables is connected to a cable grounding box arranged on the main pole of the cable terminal platform.

The power lines in the vertical downward direction are fixed through rod insulators, and the rod insulators are connected to the rod body through rod insulator cross arms.

Due to the application of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art: the three-dimensional down-conducting device of the cable terminal of the transmission line of the present invention is used to lead the overhead power line to the grounded power cable, which can make the lead-in of the overhead line Keep a sufficient safety distance between the downlines, and its appearance is more coordinated and beautiful, the wiring construction is clear and convenient, and it will not occupy too much installation area, saving investment.

Description of drawings

Accompanying drawing 1 is the three-dimensional wiring diagram of the present invention.

Accompanying drawing 2 is the front view of some components of the present invention.

Accompanying drawing 3 is the A-A sectional view of some components of the present invention.

Accompanying drawing 4 is the right side view of some components of the present invention.

In the above drawings: 1. Steel pipe pole; 2. Cable terminal platform; 3. Longitudinal support; 4. Upper cross arm; 5. Middle cross arm; 6. Lower cross arm; 7. Tension insulator string; 8. Jumper wire Insulator string; 9. Rod insulator cross arm; 10. Rod insulator; 11. Cable terminal platform main pole; 12. Cable terminal head-arrester installation platform; 13. Transition clamp; 14. Outdoor cable terminal head; 15. Power cable; 16. Lightning arrester; 17. Conductor; 18. Grounding cable; 19. Cable grounding box; 20. Power line.

detailed description

The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

Embodiment 1: As shown in accompanying drawings 1 to 4, a transmission line cable terminal three-dimensional downguide device for transferring 110kV double-circuit overhead power lines to grounded power cables, including a steel pipe pole 1 and a set The cable terminal platform 2 on the side of the steel pipe pole 1.

The steel pipe pole 1 includes a shaft 3 and a three-layer cross arm. The shaft 3 is arranged vertically relative to the installation surface (such as the ground) of the steel pipe rod 1, and adopts a steel pipe whose lower end diameter is larger than the upper end diameter. The bottom end of the shaft 3 has a connecting plate along its radial direction, and there are bolt holes on the connecting plate, so that it can be fastened to the mounting surface by bolts, and the connecting plate is provided with a connecting plate that is distributed around the shaft 3 and along its Stiffeners arranged axially. The three-layer cross-arm is distributed on the upper half of the shaft 3 , and a group of three-layer cross-arms is an upper cross-arm 4 , a middle cross-arm 5 and a lower cross-arm 6 from top to bottom along the axial direction of the shaft 3 . The longitudinal spacing between two adjacent layers of cross-arms is equal. Each cross arm adopts a rod, and its inner end is connected with the shaft 3 through a connecting assembly. The connecting assembly includes a first part arranged on the shaft 3 and a second part arranged at the inner end of the cross arm, and the first part and the second part are connected by a plurality of bolts. The first part includes several circumferential plates extending in the axial direction of the shaft 3 , and a vertical circumferential plate, that is, a pair of parallel first webs arranged vertically. The second part includes an end plate arranged in the vertical direction, a pair of second webs arranged on one side of the end plate in the vertical direction and capable of abutting against a pair of first webs respectively, and the cross arm is arranged on the other side of the end plate. Bolt holes are correspondingly opened between the abutting first web plate and the second web plate, so that the first part and the second part are connected by bolts matching the bolt holes. The projections of the axes of a group of three-layer cross-arms on the cross-section of the shaft 3 do not coincide, and the angle between the projections of the axes of the upper cross-arm 4 and the axis of the middle cross-arm 5 on the cross-section of the shaft 3 is the same as that of the middle cross-arm. The included angles between the axis of the pole 5 and the projection of the axis of the lower cross arm 6 on the section of the shaft 3 are equal. Usually, the angle between the projection of the axis of the upper cross arm 4 and the axis of the middle cross arm 5 on the cross section of the shaft 3 , the axis of the middle cross arm 5 and the axis of the lower cross arm 6 on the cross section of the shaft 3 The included angles between the projections are all set to be 30°, so that a set of three-layer cross-arms is arranged along the shaft 3 in the form of a spiral. Since this embodiment is a device used in a 110kV double circuit, two groups of three-layer cross-arms are arranged symmetrically on the shaft 3, and each group of three-layer cross-arms is connected to three phases in a power line 20 circuit. Wire. The lengths of a group of three-layer cross-arms are not the same, but the lengths of the upper cross-arm 4 and the lower cross-arm 6 are the same and longer than the length of the middle cross-arm 5, so that the outer ends of the three-layer cross-arms are in a long and narrow rectangular area middle. Usually, the length of the middle cross-arm 5 is about 3.2m, so that the horizontal distance between the outer ends of the adjacent two-layer cross-arms among the three-layer cross-arms can be maintained at about 1.6m. The outer ends of the three layers of cross arms are respectively connected to a power line 20, and the horizontal power line 20 is turned from a horizontal direction to a vertical downward direction. The outer end of the cross arm is provided with a horizontal tension insulator string 7 and a vertical jumper insulator string 8, and the power line 20 connects the ends of the tension insulator string 7 and the jumper insulator string 8 in sequence so that the horizontal The direction changes to a straight down direction. Usually, the included angle between the axis of the middle cross-arm 5 and the axis of the horizontal force line 20 is a right angle to connect each power line 20, so the axis of the upper cross-arm 4, the axis of the middle cross-arm 5 and the axis of the lower cross-arm 6 They respectively form angles of 60°, 90°, and 120° with the axial direction of the overhead power line 20 in the horizontal direction. In the middle of the shaft 3, a rod-type insulator cross arm 9 is arranged, and a plurality of rod-type insulators 10 are installed and arranged in parallel, so that the vertically downward power line 20 passed through the corresponding rod-type insulator 10 after being transferred by the cross-arm And fixed.

The cable terminal platform 2 is arranged on the side of the steel pipe pole 1. Since this embodiment is a device used in a 110kV double circuit, the steel pipe pole 1 is provided with two sets of three-layer cross-arms, so two cable terminal platforms 2 need to be provided. They are arranged symmetrically on both sides of the shaft 3 of the steel pipe pole 1, and correspond to two groups of three-layer cross arms respectively. The height of the cable terminal platform 2 is lower than that of the steel pipe pole 1 .

The cable terminal platform 2 includes the main pole 11 of the cable terminal platform vertically arranged on the installation surface, the cable terminal head-arrester installation platform 12 installed on the main pole 11 of the cable terminal platform, the cable terminal head-arrester installation platform 12 and the three-layer The outer ends of the cross arms are vertically corresponding. The cable terminal head-surge arrester installation platform 12 includes at least one straight rod member arranged horizontally, and the outer end of the three-layer cross-arm is located in a rectangular area corresponding to the cross-bar, and is transferred to the vertical downward direction through the three-layer cross-arm After the three power lines 20 are respectively fixed by rod insulators 10, they are respectively connected to one end of a power cable 15 through the transition clamp 13 and the outdoor cable terminal head 14 at the intersections with the cable terminal head-surge arrester installation platform 12 respectively. The other end of the power cable 15 goes into the ground, and the power cable 15 can be fixed on the main pole 11 of the cable terminal platform or on a fixing frame connected to the main pole 11 of the cable terminal platform. The outdoor cable terminal head 14 is installed on the cable terminal head-surge arrester installation platform 12, and the cable terminal head-surge arrester installation platform 12 can also include another accessory rod, which has a corresponding setting with the outdoor cable terminal head 14. A plurality of lightning arresters 16 are connected to a transition clamp 13 corresponding to the outdoor cable terminal head 14 and connected to one lightning arrester 16 through a wire 17 . Each power cable 15 is connected with a grounding cable 18, and each grounding cable 18 is connected to a cable grounding box 19 arranged on the main pole 11 of the cable terminal platform.

In combination with the previous engineering practice, the present invention newly designs a 110kV double-circuit overhead line leading to the steel pipe pole 1 device at the cable terminal, so that a sufficient safety distance is maintained between the down-conductors of the two-circuit overhead lines, and they are connected parallel and vertically downward to the cable Terminal head 14, in addition, independent cable terminal platform main rod 11 is set on both sides of steel pipe rod 1, which is used to place devices such as cable terminal joints and lightning arresters 16. After the improved design, the appearance is more harmonious and beautiful, the wiring construction is clear and convenient, and when one circuit is overhauled and maintained, it will not affect the normal operation of the other circuit.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. a transmission line cable termination solid draws lower device, for built on stilts power line being forwarded to the power cable into ground, it is characterized in that: described transmission line cable termination solid draws the cable shoe platform that lower device comprises steel pipe pole and is arranged at described steel pipe pole sidepiece;

Described steel pipe pole comprise vertically arrange shaft, to be innerly connected with described shaft and three layers of cross-arm not overlapping of the projection of axis on the section of described shaft, three layers of described cross-arm are respectively cross-arm, middle cross-arm and lower cross-arm, and the outer end of three layers of described cross-arm connects a described power line respectively and transfers described power line to straight down direction by horizontal direction;

Described cable shoe platform comprises cable shoe platform mobile jib, is installed on described cable shoe platform mobile jib and the cable terminal-arrester mounting platform vertically corresponding mutually with the outer end of three layers of described cross-arm, through three layers of described cross-arms switching, three power lines that are direction straight down respectively in the end that connect a power cable corresponding to described cable terminal-arrester mounting platform intersection separately, the other end of described power cable enters ground.

2. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: described cross bar is a horizontally disposed straight rod member, and the outer end of three layers of described cross-arm is arranged in the rectangular area corresponding to described cross bar.

3. transmission line cable termination solid according to claim 1 and 2 draws lower device, it is characterized in that: the angle of the angle between the axis of described upper cross-arm and the projection of the axis of described middle cross-arm on the section of described shaft with the axis of described middle cross-arm and the axis of described lower cross-arm between the projection on the section of described shaft is equal.

4. transmission line cable termination solid according to claim 3 draws lower device, it is characterized in that: the angle between the projection on the section of described shaft of the axis of the angle between the axis of described upper cross-arm and the projection of the axis of described middle cross-arm on the section of described shaft, the axis of described middle cross-arm and described lower cross-arm is 30 °.

5. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: the angle of the axis of described middle cross-arm and the axis of horizontal direction power line is right angle.

6. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: described shaft is provided with three layers of cross-arm described in two groups mutually axisymmetrically, often organizes three phase lines in described three layers of cross-arm correspondence connection power line loop; Described shaft both sides are provided with two described cable shoe platforms.

7. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: the outer end of described cross-arm is provided with the strain insulator string of horizontal direction and the wire jumper insulator string of vertical direction, described power line connects the end of described strain insulator string and the end of described wire jumper insulator string successively thus transfers direction straight down to by horizontal direction.

8. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: be connected described power cable through three layers of described cross-arms switching, three power lines that are direction straight down are corresponding through Transition wire clip and outdoor cable terminals separately; Described outdoor cable terminals are arranged on described cable terminal-arrester mounting platform; Each described Transition wire clip is connected with an arrester by wire correspondence, and described arrester is arranged on described cable terminal-arrester mounting platform.

9. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: described in every root, power cable is all connected with earth cable, and each described earth cable is all connected to the earthing box for electric cable be arranged on described cable shoe platform mobile jib.

10. transmission line cable termination solid according to claim 1 draws lower device, it is characterized in that: the described power line in direction is fixed through rod insulator straight down, and described rod insulator is connected with described shaft by rod insulator cross-arm.