JP3162787B2 - Hard-to-wear overhead overhead electric wire 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 in components such as a metal stranded wire and a jumper device constituting an overhead electric wire line, and more particularly to an overhead electric wire line excellent in snow prevention performance.

[0002]

2. Description of the Related Art In wet snow in early spring in Hokkaido, the Tohoku region, other snowy regions, or the Kanto region, a large amount of snow adheres to overhead power lines, which in addition to its own weight, causes wind and temperature. Conditions have been added, causing problems such as falling at a time, damaging buildings underneath, and damaging the insulator due to recoil when falling snow. In some cases, a serious accident occurred in which the tower was unable to withstand a large amount of snow and collapsed.

[0003] Various methods have been proposed for preventing snow accretion on such overhead wire lines. For example, (1) a method in which a magnetic wire having a low Curie temperature is wound around the surface of an electric wire to melt snow using the hysteresis loss or heat generated by eddy current at the next alternation; (3) As a method effective for preventing snow accretion, a utility model registration No. 19
No. 81394 and Utility Model Registration No. 1981395, a roughened ethylene tetrafluoride tape is wound around the surface of the electric wire, or the surface of the electric wire is coated with fluororesin, and then the surface is roughened. Although there have been proposed methods of doing so, each method has its own drawbacks and cannot be said to be sufficient to prevent snow accumulation.

[0004]

In the case of the above (1), in the case of an electric wire having a small power transmission capacity, there is a drawback that a calorific value required for melting snow cannot be obtained. There is a problem that energy is wasted because heat is generated. In the case of (2), in the case of snow containing a large amount of water, there is a problem that the snow that has arrived becomes difficult to fall. Further, regarding (3), although the anti-snow property is excellent, the tape is not in close contact with the base material, so that the surface is damaged during the overhead wire and the tape is easily cut off, and the tape is cut. In this case, since the lower electric wire is exposed, icing snow grows from that portion, and there is a problem that the ability to prevent snow accumulation is lost. Also, when the electric wire surface is coated with fluororesin, if the coating is partially damaged and the electric wire surface is exposed at the time of overhead wire, the snow accumulates and grows from that part as in the case of the tape, and the snow accumulation prevention performance is lost. There was a problem. An object of the present invention is to solve the above-mentioned problems and to provide a novel overhead electric wire line excellent in snow prevention performance.

[0005]

Means for Solving the Problems The present invention has been made as a result of various studies in view of the above-mentioned circumstances, and the outline thereof is as follows. Coating of low molecular weight tetrafluoroethylene resin having a rough surface with fine irregularities formed on the surface of a component such as a metal stranded wire or a jumper device constituting an overhead electric wire line and having a CF ₃ end on the surface. A layer is provided. In this case, the roughness of the fine irregularities formed on the surface of the overhead wire line or the like is preferably in the range of 0.5 to 5 μm in average roughness, and a rough surface of such irregularities is formed. When the above-mentioned composite coating is provided on the surface of the overhead electric wire, the final surface roughness is preferably an average roughness of 0.7 to 3 μm.

[0006]

According to the present invention, there is provided an overhead electric wire in which the coating layer of a super-water-repellent low-molecular-weight ethylene tetrafluoride resin whose end is converted to CF ₃ is roughened, and a material surface constituting the electric wire line. made of formed, this end is CF ₃ of
By forming the coating layer of a low molecular weight fluororesin, the surface of the material can have a super-water-repellent surface that is superior to the surface of ordinary polytetrafluoroethylene (PTFE) alone, which has excellent water-repellency. The reason why such excellent properties are obtained is that the surface of the coating layer has a surface state of a highly fluorinated surface having a large amount of CF ₃ groups and a small surface energy, and the surface of the substrate on which these coating layers are roughened. Since the base material is formed thinly and uniformly so as not to lose the unevenness, the effect that water becomes difficult to contact due to the unevenness overlaps, and the super-water-repellent surface state where water drops etc. are more difficult to adhere It is because it becomes.
And since it is such a super-water-repellent surface state, even when the surface is slightly damaged and the metal surface of the base material is exposed, the water repellency does not decrease, so that the surface of the material constituting the overhead electric wire line is The snow accumulation preventing function can be maintained for a long time.

Hereinafter, the specific contents of the present invention will be described. In the present invention, the rough surface of fine irregularities formed on the surface of the composition, shot blast, sand blast, liquid honing treatment or steel wire, mechanical method such as polishing treatment with steel wool or the like, or hydrofluoric acid, It can be carried out by a chemical method using an aqueous solution of an etching agent such as ammonium fluoride, hydrochloric acid or the like and immersing it. In roughening, it is necessary to appropriately select these methods and conditions according to the material and shape of the electric wire line such as an overhead electric wire, a jumper wire yoke, a retaining clamp, a damper, and an armor rod.

[0008] In addition to the above roughening, a coating layer of a low molecular weight ethylene tetrafluoride resin having a CF ₃ end at the end by a fluorination treatment is formed. 4 fluoride low molecular weight the fluorinated treated fluorine resin coating layer (terminally CF ₃ of
(Ethylene resin coating layer) is obtained by dispersing fluorinated fluororesin particles using an appropriate surfactant or the like, immersing a target wire or the like in this dispersion, and electrophoretically depositing. It can be obtained by a coating method such as an electropainting method and a spraying method. The terminus used here was converted to CF ₃
As the low molecular weight ethylene tetrafluoride resin, a fine powder that can be thinly coated so as to keep the roughened surface of the base material as it is is preferable. For example, Sefrallube (trade name, manufactured by Central Glass Co., Ltd.) Particle size: several μm, molecular weight: 8500, CF ₃ end by fluorine treatment
Has been ) Is used.

[0009]

Embodiments of the present invention will be described below. FIG.
Is a cross-sectional view of one embodiment of the present invention, in which a steel stranded wire 1 is provided at the center, an aluminum stranded wire 2 is provided thereon, and a rough surface 4 of fine irregularities is formed on the exposed surface of the outermost layer by shot blasting or the like. Was formed and the surface was terminated with CF ₃
Super water-repellent coating layer 5 of low molecular weight tetrafluoroethylene resin
Is an overhead electric wire configured to be provided.

FIG. 2 is a sectional view of another embodiment of the present invention.
A normal aluminum stranded wire 2 is provided on the steel stranded wire 1 as a center, and a rough surface 4 of fine irregularities is formed thereon by shot blasting or the like.
Is an overhead electric wire configured by providing an aluminum stranded wire 3 made of an aluminum wire provided with a super-water-repellent coating layer 5 coated with CF ₃ -modified low molecular weight ethylene tetrafluoride resin.

FIG. 3 is a cross-sectional view of still another embodiment of the present invention, in which a steel stranded wire 1 is provided at the center, an aluminum stranded wire 2 is provided thereon, and the outermost layer is finely blasted by shot blasting or the like. An aluminum tape 6 provided with a super-water-repellent coating layer 5 coated with a low molecular weight ethylene tetrafluoride resin having a CF ₃ end on the surface of the aluminum tape having the rough surface 4 It is an overhead electric wire wound and configured.

Next, a diagram in which the surface of a roughened aluminum wire is coated with an aluminum wire coated with a low molecular weight ethylene tetrafluoride resin having a CF ₃ end and twisted to the outermost layer of the twisted wire. 2 using an overhead electric wire according to the present invention and, as a comparative example, an overhead electric wire in which an aluminum wire coated with a conventional fluororesin was stranded on the outermost layer of the stranded wire.
An artificial snow accretion experiment was performed under the conditions of 5 ° C., wind speed of 6 to 8 m / s, and snowfall intensity of 50 mm / hr. As a result, almost no snow accretion was observed in the device according to the present invention, such as sliding down immediately after snow accretion. On the other hand, in the conventional product of the comparative example, about 6 minutes after the start of the experiment, snow accumulation started from a portion where the metal surface was considered to have been damaged by winding at the time of manufacturing, etc., and gradually grew large in a cylindrical shape, falling snow was no longer going to was observed.

[0013]

As a result of summarizing the above results, the snow-resistant overhead overhead electric wire line according to the present invention has a roughened outer surface such as a metal stranded wire or a jumper wire constituting the same. On the surface, a coating layer of a low molecular weight ethylene tetrafluoride resin having a large contact angle with water and a small surface energy with CF ₃ formed on the surface is formed in a thin layer so that the irregularities on the surface of the substrate are not lost. Therefore, the water-repellent effect of the uneven surface and the resin layer having a small surface energy is superimposed, and extremely excellent water-repellency is exhibited. For this reason, even when the surface is partially damaged and the metal surface of the base material is exposed due to rubbing or the like at the time of manufacturing or an overhead wire, snow accumulation from that part is prevented, so that excellent snow prevention performance is improved. Can be maintained for a period.

[Brief description of the drawings]

FIG. 1 is a sectional view of an overhead power line according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an overhead power line according to another embodiment of the present invention.

FIG. 3 is a sectional view of an overhead power line according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel stranded wire 2 Aluminum stranded wire 3 Aluminum stranded wire on which super-water-repellent coating layer was formed 4 Rough surface 5 Super-water-repellent coating layer 6 Aluminum tape

Continuing from the front page (72) Inventor Isao Kumagai 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Tadafumi Inoue 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Toshihiro Oka 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Electric Wire Co., Ltd. (72) Inventor Jin 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Invention Person Kaoru Takeda 1-5-1, Kiba, Koto-ku, Tokyo, Fujikura Electric Wire Co., Ltd. (72) Inventor Yoshimasa Nishino 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (56) References JP 57-176609 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 5/00-5/16 H01B 3/16-3/56 H01B 7/28

Claims (4)

(57) [Claims] 1. A tower constituting the overhead wire line, a metal stranded wire, formed the surface fine unevenness of the composition of the jumper device, and 4 fluoride low molecular weight end is CF ₃ into the surface A snow-resistant overhead electric wire line, characterized in that it is provided with a coating layer of ethylene fluoride resin. 2. The snow-resistant overhead electric wire line according to claim 1, wherein the rough surface of the fine irregularities on the surface of the overhead electric wire line has an average roughness of 0.5 to 5 μm. 3. An overhead wire line surface is provided with a rough surface having fine irregularities, and the surface of the overhead wire line has a CF ₃ end having a thickness of 5 to 50 μm.
The snow-repellent overhead electric wire line according to claim 1, further comprising a coating layer of a modified low molecular weight ethylene tetrafluoride resin . 4. An overhead electric wire line having a rough surface with fine irregularities provided on the surface thereof, and further having a CF ₃ end on the rough surface .
The snow-resistant overhead overhead electric wire line according to claim 1, wherein a coating layer of a tetrafluoroethylene resin having a molecular weight is provided, and the average roughness is finally 0.7 to 3 µm.