JPH0475412A - Cross wire stretching method for multi-conductor transmission line - Google Patents

Abstract

PURPOSE:To obviate the necessity of high strength steel tower and a large scale installation machine by securing one end of every short conductor to a first cross wire spacer and connecting the other end to a second cross wire spacer and connecting a turnbuckle associated with a tension detector between the second cross wire spacer and a temporary spacer. CONSTITUTION:After setting a short conductor 14A, a turnbuckle 20 associated with a tension detector, first and second cross wire spacers 18, 18 and a temporary spacer 22, drive shaft 44 of the turnbuckle 20 is rotated and contracted while observing the measurement results of the tension detector 54 of the turnbuckle 20. Upon reaching a predetermined tensile force corresponding to a predetermined sag of the short conductor 14A, contraction of the turnbuckle 20 is stopped and the clamp members 30, 30 of the second cross wire spacer 18 are clamped to two ground side conductors 12A and secured in place thus removing the turnbuckle 20 associated with tension detector and the temporary spacer 22. A next short conductor 14A is then stretched.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a method for installing a multi-conductor power transmission line having a support wire, which is used to prevent the generation of corona noise during rain. be.

(Prior art) Conventionally, a conductor is made up of a plurality of conductors and a conductive wire attached with slack below the center of two conductors on the ground side among these plurality of conductors. A two-conductor spacer installed between two conductors and an attachment wire, or a multi-conductor power transmission line installed at intervals along conductive attachment wires are known (see Japanese Patent Publication No. 63-J54129). ). In this multi-conductor power transmission line, conductive wires between the two conductors on the ground side and the ground reduce the potential gradient on the ground side, which effectively prevents corona noise from occurring during rain. .

[Section N that tries to invent or solve]

Generally, corona noise becomes concretely apparent after the multi-conductor power transmission line is installed and electricity is applied, and therefore the work of attaching the extension wire is performed after the multi-conductor power transmission line is installed. In the conventional technology, the extension wire consists of a long conductor corresponding to the span length, similar to the conductor of a multi-conductor transmission line, and therefore it is necessary to transport the long extension conductor to the site, depending on the topography and road conditions. In some cases, it may be difficult to erect the wire, and after the wire is sagged, the tension is adjusted using the retaining end of the long wire conductor, so tension is added to the tower in addition to the mass of the wire, giving the tower greater strength. In addition, large-scale construction equipment had to be brought in to erect the extension wires, making the construction work accompanied by long power outages.

The object of the present invention is to provide a multi-conductor power transmission line that avoids the above-mentioned drawbacks and allows easy installation of extension wires without requiring great strength in the steel tower or bringing in large-scale construction machinery. An object of the present invention is to provide a method for installing an extension wire.

[Means to solve the problem]

The present invention is based on the above:! In order to solve one problem, we developed a multi-conductor power transmission system consisting of multiple conductors and a conductive wire attached with slack below the center of the two conductors on the ground side. In a method of installing a line attachment wire, a short conductor is used as an attachment wire, and one end of this short conductor is attached to the first conductor held between two opposing conductors among a plurality of conductors.
The other end of the short conductor is fixed to one side of the middle of the second conductor spacer to be held between two opposing conductors, and this second conductor spacer is fixedly attached to the middle of the conductor spacer. One end of a turnbuckle with a tension detector is attached to the other side in the middle of the spacer, and the other end of the turnbuckle is attached to a temporary spacer temporarily fixed between two opposing conductors to detect the tension of the turnbuckle. While observing the device, contract the turnbuckle and stop the contraction of the turnbuckle with a predetermined tension corresponding to the predetermined slack of the short conductor, and then grip and fix the second wire spacer to the two opposing conductors. Provided is a method for installing an extension line for a multi-conductor power transmission line.

(Function) In this way, when short conductors are used as extension wires, there is no need to transport long conductors for extension wires to the site, and therefore construction is easy regardless of topography and road conditions, and the amount of slack in the extension wires is reduced. The tension of the extension wire is not applied to the steel tower, which is adjusted for each two-conductor spacer adjacent to each other.Furthermore, the slack of the extension wire is fixed for each short conductor. fixed to the first wire spacer installed between,
The other end is the same as the first conductor spacer or is connected to a second conductor spacer that is not held by the two opposing conductors, and the second conductor spacer and the temporary spacer are connected to each other. A turnbuckle with a tension detector is connected in between, and the turnbuckle is contracted until a tension corresponding to the predetermined slack of the extension wire is obtained, thereby obtaining the predetermined slack in the long extension wire. The work can be done with extremely simple tools compared to other cases.

(Example) An example of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a method for installing a multi-conductor power transmission line extension wire according to the present invention, and the multi-conductor power transmission line lO is , multiple conductor 1
2, and a conductive extension wire 14 which is attached to the ground side two conductors 12A of the plurality of conductors 12 with a slack below the substantially center thereof.

In the illustrated embodiment, the conductor 12 is wound with a spiral rod 16 for the purpose of preventing wind noise, and the spiral rod 16 can be wound in the same direction as shown, but in addition It may be changed periodically every time the mounting interval of electric wire spacers (not shown) of the multi-conductor power transmission line changes.

In addition, the larger the outer diameter of the extension wire 14 is, the more the potential gradient of the wire is relaxed, so it is preferable, or if the outer diameter is made larger, the unit length mass increases and the slack exceeds the specified value, which may reduce the potential relaxation effect. In order to obtain a predetermined sag, a large holding tension is required, which increases the gripping force of the spacer. Therefore, the extension wire 14 is usually one with an expanded conductor structure in which the stranded wires in the inner layer are loosely twisted, or resin wires are mixed in order to facilitate the compression connection of the conductor sleeve. It is preferable to use twisted wires.

The extension wire 14 should be held in place with a predetermined slack between the extension wire spacers 18 which are provided at a predetermined interval in the span of the steel tower and held between the two conductors 12A on the ground side. It consists of a short conductor 14A.

In order to construct this short conductor 14A with a predetermined slack, one end of this short conductor 14A is connected to the first wire spacer 1 held between the two conductors 12A, 12A on the ground side.
8, and the other end of the short conductor 14A is attached to one side of the middle of the second wire spacer 18, which is to be held between the two conductors 12A, 12A on the ground side.

The other side of the wire spacer 18' is connected to one end of a turnbuckle 20 equipped with a tension detector, and this turnbuckle 2
The other end of 0 is connected to a temporary spacer 22 temporarily fixed between the two conductors 12A, 12A on the ground side.

The first and second wire spacers 18.18° are shown in Fig. 3 (
A) A horizontal frame portion 26 extending horizontally in opposite directions from each end of the intermediate vertical frame portion 24 as shown in (B).
．． It consists of a frame 28 including 26' and clamping members 30, 30' which are arranged opposite each other at the ends of the horizontal frame part 26 in the same horizontal position. This wire spacer 18.18° is the spiral rod 16 of the conductor 12A.
The armor rod 32 has a pitch corresponding to the pitch of the spiral rod 16 so that it can be securely gripped on top of the armor rod 32.
is wrapped around the conductor 12A to make the outer periphery of the conductor 12A almost circular, and then the conductor 12A is gripped. A compression sleeve 15 with a clevis is connected to the end of the short conductor 14A, and the sleeve 15 is connected to the clevis 15A or the horizontal frame portion 26' of the wire spacer 18.1B' by bolts 17.

The temporary spacer 22 is attached to the bottle 34 as shown in FIG.
It consists of a frame 38 comprising two frame parts 36.36' pivoted on each other and clamping means 40 for clamping these frame parts 34.34. This temporary spacer 22 is attached to the frame portion 34.34 of the frame 38.
” has two halves of collars 42.42′ which, when closed, form a circular grip; these collars 42.42′
As shown in FIGS. 5(A) and 5(B), the spiral grooves 42a and 421 into which the spiral rod 16 of the conductor 12A engages
Further, the turnbuckle 20 with a tension detector having a
As shown in FIGS. 6(A) and 6(B), a rotating shaft 48 is rotated via a bevel gear means 46 by the rotation of a drive shaft 44 rotated by an appropriate jig (not shown), and a rotating shaft 48 is rotated by the rotation of this rotating shaft 48. It consists of sliding members 50 and 50' that are threadedly connected in opposite directions to both ends of the rotating shaft 48 or cannot rotate, and are attached to a clevis joint fitting 52° connected to the sliding member 50'. and a tension detector 54. The tension detector 54 consists of four resistance wire strain gauges 54 mounted on the outer periphery of the clevis joint fitting 52 at equal intervals in the circumferential direction, and these resistance wire strain gauges 55 are bridge-connected by lead wires 56 and connected to a connector 58. It is connected to an external measuring instrument via a cable 60 connected to. This turnbuckle 20 with a tension detector is described in Japanese Unexamined Patent Publication No. 110945/1982, and therefore, detailed description thereof will be omitted. One clevis joint fitting 52 of this turnbuckle 20
The clevis 62 attached to the second wire spacer 18
The frame 3 of the spacer 22 is connected to the vertical frame part 24 in the middle of the spacer 22 with a bolt 64, and the clevis 62' attached to the other clevis joint fitting 52 is temporarily fixed.
The mounting is connected to the middle part of 8 by a bolt 64'.

The method of the present invention includes the short conductor 14A to be constructed as described above, the turnbuckle 20 with a tension detector, the first and second wire spacers 18, 18', and the temporary spacer 22.
After setting the tension detector 5 of the turnbuckle 20
While observing the measurement results in step 4, the drive shaft 44 of the turnbuckle 20 is rotated and contracted, and when the predetermined tension corresponding to the predetermined slack of the short conductor 14A is reached, the turnbuckle 20
, the clamp member 30.30゛ of the rear part 2 of the wire spacer 18° is gripped and fixed to the two conductors 12A on the ground side, and the turnbuckle 20 with tension detector and the temporary fixing spacer 22 are fixed. Remove.

Thereafter, the primary short conductor 14A is constructed, but in this case, the second extension wire spacer 18' used when constructing the previous short conductor is used as the first extension wire spacer, and the construction work is performed in the same manner as described above.

In the above embodiments, each short conductor was constructed using a turnbuckle with a tension detector, or two or three short conductors were installed with an intermediate (second) spacer between them. It is also possible to assemble a short conductor composite, connect a turnbuckle with a tension detector to this composite, and operate in the same manner as above.

In the above embodiment, the extension wire 14 is attached between two conductors 12A on the ground side of the plurality of conductors 12, or between two opposing conductors above the ground side. It may be installed on. However, in this case, either this extension wire 14 or 2 on the ground side
It is necessary that the conductor 12A hangs down approximately at the center of the strip conductor 12A.

(Effects of the Invention) According to the present invention, as described above, since short conductors are used as extension wires, there is no need to transport long conductors for extension wires to the site, and therefore construction is possible regardless of topography and road conditions. In addition, since the amount of slack in the extension wire is adjusted for each adjacent extension wire spacer, the tension of the extension wire is not applied to the steel tower, and there is no need to increase the strength of the steel tower, making it economical. Since the tension is measured using a simple turnbuck crane with a tension detector and the tension is pulled with a predetermined slack, the work can be easily done with simple tools without using large-scale construction machinery, which is a practical benefit.

[Brief explanation of the drawing]

Figures 1 and 2 are a top view and a side view of a part of a multi-conductor power transmission line having a wire attached by the method of the present invention, respectively, and Figures 3 (A) and 3 (B) are respectively used in the present invention. FIG. 4 is a front view of the temporary spacer used in the present invention, and FIG. 5 (A
)(B) are a side view and a front view of the collar of the temporary fixing spacer shown in FIG. 4, respectively, and FIGS. 6(A) and (B) are a top view and a cross-sectional view, respectively, of the turnbuckle with a tension detector used in the present invention. It is. 10---One multi-conductor power transmission line, 12---One or more conductors, 12A---One ground side conductor, 14------
One wire, 14A---One short conductor, 18, ts' -
---Part 1 and second wire spacer, 20-11 Turnbuckle with tension detection base, 22m-temporary fixing spacer, 54---Tension detector.

Claims (1)

[Claims] In the attachment wire installation method for a multi-conductor power transmission line consisting of a plurality of conductors and a conductive attachment wire attached with slack approximately below the center of two conductors on the ground side among the plurality of conductors, A short conductor is used as the conductor, one end of the short conductor is fixedly attached to the middle of a first conductor spacer held between two opposing conductors of the plurality of conductors,
The other end of the short conductor is attached to one side in the middle of the second conductor spacer to be held between the two opposing conductors, and a tension detection device is attached to the other side in the middle of the second conductor spacer. Attach one end of the turnbuckle with the turnbuckle, and attach the other end of the turnbuckle to the temporary spacer temporarily fastened between the two opposing conductors, and while observing the tension detector of the turnbuckle, Contracting the buckle to stop the contraction of the turnbuckle with a predetermined tension corresponding to the predetermined slack of the short conductor, and then gripping and fixing the second wire spacer to the two opposing conductors. A method for installing an extension line for a multi-conductor power transmission line.