JP2922700B2 - How to install multi-conductor transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a method for laying a multi-conductor power transmission line having a suffix used for preventing the occurrence of corona noise during rainfall.

[0002]

2. Description of the Related Art Conventionally, a conductor has a plurality of conductors and, among these plurality of conductors, a conductive wire which is slackened and attached below a substantially central portion of two conductors on the ground side. Article 2 and second conductor spacer multi-conductor transmission line provided at intervals along the conductive添線is known (JP-B 63-64129 discloses mounted between the conductor and添線of reference). In this multi-conductor power transmission line, the corona noise is effectively prevented from occurring during rainfall because the conductive additional wire reduces the potential gradient on the ground side between the two conductors on the ground side and the ground. You.

[0003]

Generally, corona noise is specifically identified after power is applied after erection of a multi-conductor power transmission line, and therefore, the work of attaching an auxiliary wire is performed after the erection of the multi-conductor power transmission line. Have been. In the prior art, the auxiliary wire is composed of a long conductor corresponding to the span length, similarly to the conductor of the multi-conductor transmission line, and therefore it is necessary to transport a long auxiliary conductor to the site. Is difficult to install, and the slack of the auxiliary wire is adjusted while adjusting the tension at the retaining end of the long conductor for the auxiliary wire after the installation. It was required, and a large-scale construction machine had to be carried in to install the auxiliary line, which required construction involving a long-term power outage.

SUMMARY OF THE INVENTION An object of the present invention is to avoid the above-mentioned drawbacks, and to provide a multi-conductor system in which an auxiliary wire can be easily installed without requiring a large strength for a steel tower and without carrying in a large-scale construction machine. An object of the present invention is to provide a method of erection of an auxiliary line of a transmission line.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of conductors and an auxiliary wire attached between two conductors on the ground side of the plurality of conductors. Spec
In a method of erection of a multiconductor power transmission line composed of a conductive auxiliary line with a slack at a lower portion of a central portion of a conductor, a short conductor is used as the auxiliary line, and the middle of the short conductor is
Support both ends of the short conductor with supporting
And one of the additional spacers is fixed to two conductors
So that the short conductor has a predetermined slack.
After adjusting the pacer, connect the other additional wire spacer to the two conductors.
There is provided a method of erection of a multi-conductor power transmission line, which comprises fixing and then removing an intermediate auxiliary metal fitting.

[0006]

As described above, when the short conductor is used as the auxiliary wire,
There is no need to transport long auxiliary conductors to the site, which facilitates installation regardless of the topography and road conditions, and the amount of slack in the auxiliary wires is controlled by a steel tower that is adjusted for each two adjacent conductor spacers. No tension is applied. Further, the tension of the short conductor for the auxiliary wire is adjusted by fixing both ends of the short conductor to two auxiliary wire spacers to be attached between two opposing conductors among a plurality of conductors. Before the line spacer is gripped and attached to the two opposing conductors, the wire spacer is held halfway by the intermediate auxiliary metal fitting, so that a predetermined slack can be obtained with a small tension.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a multi-conductor transmission line constructed according to the present invention; FIG. Numeral 10 includes a plurality of conductors 12 and a conductive additional wire 14 with a slack attached substantially below the center of the two conductors 12A on the ground side of the plurality of conductors 12.

The larger the outer diameter of the auxiliary wire 14 is, because the larger the outer diameter, the more the potential gradient of the electric wire is eased. However, if the outer diameter is increased, the unit length mass increases and the sag becomes more than specified, and the potential relaxing effect is reduced. Since a large retaining tension is required to obtain a predetermined slack, the gripping force of the spacer is increased. Therefore, as the auxiliary wire 14, an expandable conductor structure in which the stranded wire of the inner layer is sparsely twisted is usually used. However, in order to facilitate the compression connection of the conductor sleeve, a resin wire is mixed. It is preferable to use a twisted wire.

The auxiliary wires 14 are provided with a predetermined interval between the diameters of the steel towers, and should be retained with a predetermined slack between the auxiliary wire spacers 16 held between the two conductors 12A on the ground side. It is composed of a short conductor 14A. This short conductor 14A is composed of two opposing conductors 12A on the ground side,
It is fixedly attached via a compression sleeve 18 to the middle of the auxiliary wire spacer 16 gripped between 12A.

In the method of the present invention, when the short conductor 14A is erected, as shown in FIGS.
A is slidably gripped by the intermediate auxiliary metal fitting 20 gripped between two opposing conductors 12A on the ground side in the middle of the two auxiliary wire spacers 16 while compressing sleeves at both ends of the short conductor 14A. 18 is fixedly mounted in the middle of the two additional wire spacers 16, and these two additional wire spacers 16 are gripped by the two opposing conductors 12A on the ground side so that the additional wire 14 has a predetermined tension. After fixing, the intermediate auxiliary fitting 20
Remove.

More specifically, the auxiliary wire spacer 16
1 and 2, as shown in FIG. 1 and FIG. 2, a spacer body 24 having conductor clamps 22 to be clamped to the two conductors 12A at both ends thereof, and the compression sleeves 18 at both ends of the short conductor 14A are attached to the spacer body 24. It is fixed by screwing.

In the method of the present invention, one auxiliary spacer 1
6 is fixed to the two conductors 12A and the short conductor 14A
A compression sleeve 18 attached to one end of the short conductor 14A is fixed to the spacer body of the one auxiliary wire spacer 16 by screws, and then, as shown in FIG. Thus, the short conductor 14A is sequentially supported between the two conductors 12A via the intermediate auxiliary fitting 20.

As shown in FIG. 5, the intermediate auxiliary metal fitting 20 has a clamp portion 26 gripped by the two conductors 12A at both ends, and has a receiving portion 28 in the middle for loosely receiving the short conductor 14A. A pair of clamp members 30, 30 '
Consists of Accordingly, the short conductor 14A slidably penetrates the intermediate auxiliary fitting 20.

In FIG. 4, the two intermediate auxiliary members 20 support the short conductor 14A between the auxiliary spacers 16, but one intermediate auxiliary member 20 or three or more intermediate auxiliary members 20 are provided.
May support the short conductor 14A. Finally, short conductor 1
The compression sleeve 18 attached to the other end of 4A is screwed and fixed to the spacer body 24 of the auxiliary wire spacer 16 temporarily slidably fixed to the two conductors 12A.

After that, the temporarily fixed auxiliary wire spacer 1
6 is slid along the two conductors 12A by an arbitrary means to give a predetermined slack to the short conductor 14A. At this time, since the short conductor 14A is supported by the plurality of intermediate auxiliary fittings 20, the short conductor 14A can be pulled with a small tension. In this manner, the conductor clamp 22 of the temporary attachment spacer 16 is fixed to the two conductors 12A at the position where the predetermined slack is applied, and finally the intermediate auxiliary metal fitting 20 is removed, as shown in FIGS. 1 and 2. Short conductor 14 with predetermined slack
A is erected. The short conductors 14A are connected to each other by an appropriate means to form the auxiliary wire 14.

In the above embodiment, the auxiliary wire spacer 16 is attached between the two conductors 12A on the ground side, but may be attached between other two conductors which are horizontally opposed to each other. However, in this case, it is necessary that the auxiliary wire 14 be slackened in the middle of the two conductors 12A on the ground side and below the two conductors 12A. Further, the compression sleeve 18 may be fixed to the temporarily fixed auxiliary wire spacer 16 in advance, and the receiving portion 28 of the intermediate auxiliary fitting 20 may have a structure for fixing the short conductor 14A.

[0017]

According to the present invention, as described above, since the short conductor is used as the auxiliary line, it is not necessary to transport the long auxiliary conductor to the site, and therefore, the installation is easy regardless of the topography and road conditions. In addition, since the slack amount of the auxiliary wire is adjusted for each adjacent auxiliary wire spacer, the tension of the auxiliary wire is not applied to the steel tower, and it is not necessary to increase the strength of the steel tower, which is economical.
Further, since the slack of the short conductor for the auxiliary wire is adjusted while being supported by the intermediate auxiliary metal fitting, a predetermined slack can be obtained with a small tension, so that the construction can be easily performed.

[Brief description of the drawings]

FIG. 1 is a top view of a portion of a multi-conductor power transmission line having additional lines installed by the method of the present invention.

FIG. 2 is a side view of a portion of a multi-conductor power transmission line having an auxiliary line constructed by the method of the present invention.

3 is a transverse sectional view of a multi-conductor transmission line.

FIG. 4 is a side view schematically showing the method of the present invention.

FIG. 5 is a front view of an intermediate auxiliary fitting used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Multi-conductor transmission line 12 Multiple conductors 12A Ground conductor 14 Auxiliary wire 14A Short conductor 16 Auxiliary spacer 18 Compression sleeve 20 Intermediate metal fitting

Claims (1)

(57) [Claims] An electric conductor provided with a slack under a substantially central portion of an auxiliary wire spacer attached between a plurality of conductors and two conductors on the ground side of the plurality of conductors. In the method of erection of a multi-conductor transmission line comprising a sex auxiliary line, a short conductor is used as the auxiliary line, and the middle of the short conductor is
Support both ends of the short conductor while supporting with auxiliary metal fittings.
It is fixed to the pacer, and one of the additional wire spacers is
And fix the short conductor to a predetermined slack.
After adjusting one of the additional spacers, the other additional spacer
Is fixed to the two conductors, and then the intermediate auxiliary metal fitting is removed.