JP2000268635A - Snow accretion preventing type overhead electric wire and wire line thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain all the surfaces of overhead electric wires to ultrawater- repellency for a long period by coating outside faces of the overhead electric wires or metal tapes covering the outside faces of the overhead electric wires with anatase type ultrawater-repellent titanium oxide. SOLUTION: An outside face part of a bare metal wire rod 1 forming an outermost layer of overhead electric wires 2 is coated with anatase type ultrawater-repellent titanium oxide 3 and a snow accretion preventing type overhead electric wire is formed. Anatase type ultrahydrophilic titanium oxide is coated on the overhead electric wires 2 twisting a plurality of bare metal wire rods 1 over a plurality of layers or metal tapes covering the overhead electric wires 2. The anatase type ultrawater-repellent titanium oxide 3 has a contact angle close to 180 deg. in which contacting water becomes a spherical waterdrop and water to stick the surface becomes a waterdrop and rolls. As a result, snow falling on the overhead electric wires 2 and wire line structural members falls on the ground only if snow contacts the overhead electric wires 2 and the wire line structural members and is not deposited on the overhead electric wires 2 and the wire line structural members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead power line such as an overhead power transmission line or an overhead ground wire (including an OPGW including an optical fiber), which is expected to have an effect of preventing snow accumulation and a self-cleaning effect, and a line thereof. .

[0002]

2. Description of the Related Art Aerial power lines such as overhead power transmission lines and overhead ground wires (including OPGW) installed between steel towers cause disconnection and various other accidents due to the adhesion and deposition of snow on the overhead power lines. There is a demand for the development of technology to prevent snow from accumulating on electric wires, so that the work under the track is not damaged by falling snow that has accumulated on the electric wires. The proposal has been made.

[0003] As this kind of technology conventionally provided,
(B) A technology in which snow that adheres to the outer periphery of the electric wire and develops while moving along the twisted groove of the electric wire is caused to collide with a ring attached to the outer periphery of the electric wire to drop off the electric wire,
(B) By attaching the weight to the wire in a suspended state,
The wire is prevented from twisting and rotating in the circumferential direction, which causes the wire to rotate in the circumferential direction due to the eccentric load of snow attached to the wire, and eventually snow develops in a cylindrical shape over the entire circumference of the wire. (C) Utilizing the Joule heat generated by the eddy current of the low-Curie magnetic metal member attached to the electric wire to the snow deposited on the electric wire and the heat generated by the increase in hysteresis loss (D) Insulating between the stranded layers of the electric wire, applying current to only one of the stranded layers to raise the temperature of the electric wire, thereby melting the snow attached to the electric wire. (E) twisting an insulated wire into a bare metal wire, heating the insulated wire to melt the snow attached to the wire, and (f) fluorine on the wire surface Wrapping resin tape, And it may be provided a film of fluororesin,
Techniques are known in which the surface of the electric wire is made water-repellent to make it difficult for snow to adhere thereto. However, each of these techniques has the following problems.

[0004]

That is, the above (a)
According to the technique described in the above, when the amount of snow attached to the electric wire becomes large, some snow collides with the ring and drops off, but snow that cannot be dropped off remains, and further snow accumulates on it. Then, the eccentric load of the snow causes the electric wire to twist and rotate in the circumferential direction, so that it is impossible to prevent the snow from developing into a tube snow.

In the technique (b), in order to reliably prevent the electric wire from rotating in the circumferential direction, a large number of weights must be suspended at relatively small intervals in the longitudinal direction of the electric wire. For this reason, a large load is always applied over the entire span of the wire, resulting in a remarkable increase in the sag. When an attempt is made to prevent the sag from increasing, an extremely large overhead wire tension is applied to the electric wire. It is not preferable for the electric wire to always apply a large load or tension as described above, and that does not necessarily mean that it is possible to reliably prevent the cylindrical attachment and accumulation of snow on the electric wire.

Further, in the technique (c), it is considered that icing and snow are likely to occur at night or the like, and the load is small and only a charging current flows through a line (transmission line).
In an overhead ground wire or the like through which little current flows, the heat generation of the low-Curie magnetic metal member is small, and a sufficient heat generation amount cannot be obtained, so that the snow melting effect cannot be expected.

Further, in the technique (d), the current flowing through any of the insulated stranded layers in order to raise the temperature of the electric wire utilizes the current flowing through the main line.
Therefore, similarly to the above-mentioned technology (c), the temperature of a power transmission line or an overhead ground wire at night or the like where the load is small is not sufficiently increased, and the snow melting effect cannot be expected. In addition, there is a problem that the structure of the connection portion and the staying portion of the transmission line becomes difficult.

Further, in the technique (e), another power supply for supplying current to the insulated wire is required, which complicates the line facilities, and is not very effective in terms of withstand voltage of the insulator of the insulated wire. There is a disadvantage that it is not possible to heat the insulated wire with one power supply over a long distance.

According to the technique (f), the fluororesin which makes the surface of the electric wire water-repellent has a strong property of repelling water. However, the overhead electric wire under the severe outdoor natural environment has a dirt. Is likely to adhere, and its performance deteriorates early. Therefore, durability becomes a problem, and there is a disadvantage that it is difficult to maintain the expected effect for a long time.

[0010] The present invention provides a new snow-prevention type overhead electric wire and its line which can effectively prevent snow from accumulating without the disadvantages found in the above-mentioned techniques (a) to (f). It is intended to provide.

[0011]

In order to achieve the above object, according to the present invention, an outer surface of an overhead electric wire formed by twisting a plurality of bare metal wires or an outer surface of the overhead electric wire is covered. An anatase type super water-repellent titanium oxide was coated on a metal tape to form a snow-prevention type overhead electric wire. Further, the outer surface of various line components of the overhead electric wire installed between the steel towers was coated with anatase type super water-repellent titanium oxide to form a snow-prevention type overhead electric wire line.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a snow protection type overhead electric wire and its line according to the present invention. FIG. 1 shows a first embodiment of the invention according to claim 1, wherein an anatase is provided on an outer surface of a bare metal wire 1 forming an outermost layer of an overhead electric wire 2.
The super-water-repellent titanium oxide 3 is coated to form a snow-prevention type overhead electric wire. In this example,
After forming the overhead electric wire 2 by twisting a plurality of bare metal wires 1 over a plurality of layers, the outer surface of the overhead electric wire 2 is coated with the anatase type super water-repellent titanium oxide 3.

FIG. 2 shows a second embodiment of the invention according to the first aspect, in which an anatase type super water-repellent oxidation is applied to the entire outer periphery of each bare metal wire 1 forming the outermost layer of the overhead electric wire 2. Titanium 3 is individually coated to form a snow protection type overhead electric wire. In this embodiment,
A plurality of bare metal filaments 1 previously coated with an anatase type super water-repellent titanium oxide 3 are twisted as the outermost layer.

FIG. 3 shows a first embodiment of the invention according to claim 2, wherein a plurality of metal tapes 4 made of aluminum or the like coated with an anatase type super water-repellent titanium oxide 3 are used. A snow prevention type overhead electric wire is formed by being wound around the outer periphery of the overhead electric wire 2 so as to collectively cover the entire outer periphery of the overhead electric wire 2 formed by twisting the bare metal filaments 1.

FIG. 4 shows a second embodiment of the invention according to claim 2, in which a plurality of bare metal wires 1 forming the outermost layer of the overhead electric wire 2 are divided into appropriate numbers. A metal tape 4 such as aluminum coated with an anatase type super water-repellent titanium oxide 3 is wound around the outer periphery of each group of bare metal filaments, which are appropriately divided into a number, and a snow prevention type fictitious type. An electric wire is configured.

FIG. 5 shows an embodiment of the invention according to claim 3, wherein, for example, a jumper conductor 6A and a yoke 6 in an overhead electric wire 2 installed between steel towers 5.
B, retaining clamp 6C, damper 6D, armor rod 6
E, anatase type super water-repellent titanium oxide 3 is coated on outer surfaces of various line components 6 such as a spacer 6F, a low-Curie heat-generating wire 6G, and other wire attachment articles (not shown) where snow is likely to adhere. A snow-prevention overhead power line is configured. As the overhead electric wire 2 in this case, it is preferable to use any of the ones shown in FIGS. 1 to 4, that is, any one of the structures according to the first or second aspect. In this case, various track components 6
In addition, all the surfaces of the overhead electric wire path component composed of the overhead electric wire 2 can be made super-water-repellent.

In the embodiments shown in FIGS. 1 to 5, the outer surface of the overhead electric wire 2 (FIGS. 1 and 2) and the surface of the metal tape 4 covering the outer surface of the overhead electric wire (FIGS. 3 and 4) And various line components 6A to 6A in an overhead power line.
The coating (coating) of the anatase-type super water-repellent titanium oxide 3 on the outer surface of G (FIG. 5) and the like is based on the contact angle between the surface of the fluororesin, which is the surface of the electric wire, and the water (the surface of the substance) in the aforementioned prior art (f) The smaller the angle is, the easier the water spreads and the larger the angle is, the more water is repelled and repelled by water droplets) of about 110 degrees. While the contact angle of graphite is 143 degrees, its contact angle is close to 180 degrees, which means that it has super-water repellency, meaning that the water droplets become almost perfect spheres, and therefore adhere to its surface. The water to be rolled on the surface as spherical water droplets falls off without being able to adhere to the surface.

Also, anatase type super water repellent titanium oxide 3
Has a self-cleaning (self-cleaning) action of decomposing and removing pollutants during rainfall, and maintains the super-water-repellent function for a long time.

[0019]

According to the snow-prevention type overhead electric wire and its line according to the present invention, the following effects can be obtained. The anatase type super water-repellent titanium oxide coating on the outer surface of the overhead electric wire or the surface of the metal tape covering the outer surface and the outer surfaces of the various line components is used to make the contacting water 180 degrees at which almost completely spherical water droplets are formed. Water that has a close contact angle and thus adheres to its surface rolls as a spherical droplet and cannot adhere to the surface. Therefore, the snow that falls on overhead electric wires and track components is
Simply by contacting them, they fall to the ground and do not adhere to and accumulate on overhead electric wires or track components.

The anatase-type super-water-repellent titanium oxide coating has a self-cleaning effect, so that the desired function (water-repelling property) can be maintained for a long time.

Therefore, according to the present invention, it is possible to effectively prevent snow from accumulating on an overhead electric wire and a line constituent member for a long period of time without incurring the above-mentioned disadvantages found in the conventional techniques (a) to (f). Can be.

Further, the first aspect of the invention according to claims 1 and 2 is as follows.
In the embodiment and the invention according to claim 3, this can be applied not only to the overhead wires and the line components in the newly installed line, but also to the overhead wires and the line components in the existing line.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a snow protection type overhead electric wire according to claim 1;

FIG. 2 is a cross-sectional view showing a second embodiment of the snow protection type overhead electric wire according to the first embodiment.

FIG. 3 is a cross-sectional view showing a first embodiment of a snow protection type overhead electric wire according to claim 2;

FIG. 4 is a cross-sectional view showing a second embodiment of a snow protection type overhead electric wire according to claim 2;

FIG. 5 is a schematic side view showing an embodiment of a snow-prevention type overhead power line according to claim 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bare metal wire 2 Overhead electric wire 3 Anatase type super water-repellent titanium oxide 4 Metal tape 5 Steel tower 6 (6A-6G) Line constituent member

Claims (3)

[Claims] An outer surface of an overhead electric wire (2) formed by twisting a plurality of bare metal wires (1) is coated with an anatase type super water-repellent titanium oxide (3). Snow prevention overhead wire. 2. An anatase type super water-repellent titanium oxide (3) is coated on a metal tape (4) covering an outer surface of an overhead electric wire (2) formed by twisting a plurality of bare metal wires (1). A snow protection type overhead electric wire, characterized in that: 3. An anatase type super water-repellent titanium oxide (3) is coated on the outer surface of various line components (6) of an overhead electric wire (2) installed between steel towers (5). A snow-prevention type overhead power line.