JP2594205Y2 - Low-noise finned electric wires that are hard to snow - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-noise finned electric wire which is hard to snow.

[0002]

2. Description of the Related Art A low-noise finned electric wire is an overhead transmission line composed of an aluminum-coated steel wire 1 and aluminum wires 2 and 12 as shown in FIG. ) And the finned aluminum wire 5 or the finned aluminum coated steel wire 9 on the outermost layer of the OPGW overhead ground wire (Fig. This is an electric wire with low wind noise and low noise realized by twisting the wire outward. The fin portion 14 is a projection formed continuously in the longitudinal direction and having a shape effective for noise reduction.

[0003]

In such a low-noise finned electric wire, when snow falls, the snow on the fin portion grows greatly while rotating along the fin portion 14 to form a so-called snowy snow. Various power transmission failures such as abnormal vibration of the electric wire and short-circuit between phases have occurred. In addition, such a finned wire has a problem that the fin portion 14 is damaged or crushed when the drum is wound or wired, and the low noise effect is impaired.

[0004]

Means for Solving the Problems The present invention has been made as a result of intensive studies in view of such a situation, and an object of the present invention is to provide a low-noise finned wire which is hard to snow. It is in. That is, in the present invention, the finned wire is covered with a cap made of a non-metallic material having a small friction coefficient on the fin portion of the finned wire of the required number of twisted low-noise finned wires on the outermost layer. It is characterized by having.

Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a low-noise finned electric wire according to the present invention, which is made hard to snow. This electric wire with fins is composed of 24 strands of aluminum wire 2 having a circular cross section around two strands of 7 strands of aluminum-coated steel wire 1 and 18 aluminum wires having a fan-shaped cross section. 12 and four finned aluminum wires 5 each having a fin portion 4 covered with a cap 6 made of a non-metallic material having a U-shaped cross section having a small coefficient of friction, and twisting the fin portion 4 outward. It is an overhead transmission line with fins that are difficult to reach and have low noise.

FIG. 2 is a cross-sectional view showing another embodiment of the low-noise finned electric wire of the present invention, which is hard to reach snow. This finned electric wire has eight cross-section fans around an aluminum tube 7 for inserting an optical fiber. Twisted aluminum-coated steel wire 11 of the type, and furthermore, 11 aluminum-coated steel wires 11 of fan-shaped section and one aluminum-coated steel wire 9 with fins
The finned aluminum-coated steel wire 9 is a fin portion 4 covered with a cap 6 having a U-shaped cross section.
Are twisted outward.

In the present invention, the fin portion 4 of the finned wire is used.
The cap 6 made of a non-metallic material having a small friction coefficient is not limited to a U-shaped cross section as shown in the figure, but may have various shapes corresponding to the cross-sectional shape of the fin portion 4 of the finned wire. Things apply.

The cross-sectional dimension of the fin portion 4 does not exceed the cross-sectional size of the fin portion of the conventional finned wire with the cap 6 covered, and the top thickness h of the cap 6 is set to The lower noise effect of the finned wire is to make the thickness of the side of the cap 6 not more than 1/5 of the total width D including the cap 6 of the fin portion 4 not more than 1/5 of the total height H including the fin 6. And the fin portion 4 is sufficiently prevented from being damaged, which is preferable.

The cap 6 is made of a non-metallic material having a small coefficient of friction. As the non-metallic material, a plastic material such as a polymer resin is suitable because it has excellent moldability and weatherability. Non-metallic materials have a coefficient of friction of 0.1
The following is preferable because snow can be reliably prevented. In order to cover the cap 6 on the fin portions 4 of the finned wires 5 and 9, a method of fitting the cap 6 having a narrowed opening to the fin portions 4 or the like is applied. The cap 6 may be a long one that matches the length of the finned wire, or a short one that is connected sequentially. Filler wires 5, 9 between caps 6
A little exposure has little effect on the snow accumulation prevention effect.
It is preferable that the cap 6 be put on immediately after the completion of the stranded wire in order to prevent the fin portion 4 from being damaged. Furthermore, the number of finned aluminum wires and finned aluminum-coated steel wires to be twisted with the electric wire of the present invention is one.
It is not limited to books or four.

[0010]

With the low-noise finned electric wire of the present invention, the fin portion of the finned electric wire is covered with a cap made of a non-metallic material having a small coefficient of friction, so that the snow on the finned electric wire slides on the cap. It does not fall and grow into snowy snow etc.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Example 1 An overhead power transmission line with a fin having difficulty in snow accumulation and low noise having a cross-sectional structure shown in FIG. 1 was manufactured according to a normal manufacturing method. The caps 6 were manufactured in various thicknesses using various polymer resins having different friction coefficients. The dimensions of the fin portion 4 were formed to be the same as the dimensions of the fin portion 14 of the conventional low-noise finned wire with the cap 6 covered.

Comparative Example 1 The conventional low-noise finned overhead transmission line shown in FIG. 3A was manufactured. Each of the low-noise finned overhead power transmission lines obtained in this manner was connected to a snow-covered area, and the snow accretion status was investigated. The results are shown in Table 1 together with the noise prevention effect.

[0013]

[Table 1] ┌─────┬─┬──────────────┬─────┬─────┐ │ Classification │No│ Polymer resin cap │Average snowfall │Noise prevention │ │ │ ├────┬────┬────┤Weight │Effect │ │ │ │Friction coefficient │Top ratio │Side ratio │ g / m │ │ ├─ ─┬──┼─┼────┼─ h / H─┼─ d / D─┼─────┼─────┤ │Book│Implementation│1│0.01│1 / 7 │1 / 10 │ 13 │Good │ │Proposal│Example 1│2│0.03│ 〃 │ 〃 │ 21 │ 〃 │ │ │ │3│0.07│ 〃 │ 〃 │ 28 │ 〃 │ │ │ │ │ │ │ │4│ 〃 │1 / 4 │ 〃 │ 27 │Slight decrease │ │ │ │ │5│ │ │1 / 7 │1 / 6 │ 〃 │ 〃 │ │ │ │6│ │ │1 / 4 │ 〃 │ 26 │ │ │ │ │ │ 7 │ 0.10 │ 1/7 │ 1/10 │ 44 │ Good │ │ │ │ │ │0.14│ 〃 │ 〃 │ 95 │ 〃 │ ├──┼──┼─┼────┼────┼────┼─────┼─────┤ │ Comparison │ Comparison │ 9 │ None │ None │ 0 │ 780 │ Locally low │ │ Example product │ Example 1 │ │ │ │ │ (Snowfall) │ Lower │ └──┴──┴─┴──── ┴────┴────┴─────┴─────┘

As is apparent from Table 1, the product of the present invention (No. 1)
8) fall before the snowfall grows into a conical snow,
The vibration of the wires during the snowfall was small. In Nos. 4 to 6, the cap was thick and the finned aluminum wire 5 was slightly exposed between the caps 6, so that the noise prevention effect was slightly reduced. In No. 8, since the friction coefficient of the cap made of the polymer resin exceeded 0.1, the amount of snow accumulation increased slightly. On the other hand, in No. 9 of Comparative Example, the aluminum wire with fin was not covered with the polymer resin cap, so the snow grew greatly in the snow, and when the snow fell, the overhead transmission line vibrated violently and short-circuited. An accident has occurred. Also, the fin portion 14 was damaged during the overhead wire, and noise was generated at the damaged portion.

Example 2 An OPGW overhead ground wire with hard-to-snow, low-noise fins having the cross-sectional structure shown in FIG. 2 was manufactured. A cap having the same friction coefficient and thickness as No. 3 of Example 1 was used. The dimensions of the fin portion 4 were formed to be the same as the dimensions of the fin portion 14 of the conventional low-noise finned wire with the cap 6 covered.

[0016] An investigation was also made of the snow-covering situation of the OPGW overhead ground wire with low-finish low-noise fins in the same manner as in Example 1. There was no. Also, the generation of noise was sufficiently suppressed. that's all,
Although the description has been given of the case where the finned electric wire is made of an aluminum wire or an aluminum-coated steel wire, the present invention can also obtain the same effect when applied to a finned electric wire using a copper wire.

[0017]

[Effect] As described above, the low-noise finned electric wire of the present invention realizes snow hardening without impairing the noise prevention effect, and can avoid various power transmission disturbances and damage to the fin portion. It is also effective in prevention and has a remarkable industrial effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a low-noise finned electric wire of the present invention, which is hard to reach snow.

FIG. 2 is a cross-sectional view illustrating another embodiment of the low-noise finned electric wire of the present invention, which is hard to reach snow;

FIG. 3 is a cross-sectional view of a conventional low-noise finned electric wire.

[Explanation of symbols]

1,11 Aluminum coated steel wire 2,12 Aluminum wire 3 Aluminum wire with fin covered with polymer resin cap 4,14 Fin portion 5 Aluminum wire with fin 6 Polymer resin cap 7 Aluminum pipe 8 Polymer resin cap Aluminum coated steel wire with fins 9 Aluminum coated steel wire with fins

Claims (1)

(57) [Scope of request for utility model registration] 1. A finned wire is covered with a cap made of a non-metallic material having a small coefficient of friction on a fin portion of the finned wire of a required number of twisted low-noise finned wires on an outermost layer. A low-noise finned electric wire that is difficult to snow-cover.