JPH043367Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a snow-resistant overhead electric wire that prevents snow from accumulating on the overhead electric wire. [Conventional technology] In cold regions and especially in areas with heavy snowfall, there are many accidents caused by snow accretion on overhead power lines, and these snow accretion accidents occur when the snow adhering to the electric wires gradually grows into a large cylinder shape and becomes a heavy snow mass. Accidents are occurring as a result of the swelling.

When snow accretes on an overhead power line that is installed in a curved manner with a predetermined degree of slack in the span between the towers, the accumulated snow slides and rotates on the surface of the wire due to its own weight, causing damage to the lower side of the overhead power line that is curved and suspended. It slides down into position and accumulates.

When this accumulated snow slides and rotates on the wire surface and slides down to a low position, the accumulated snow that adheres to the surface of the outermost stranded wire of the stranded wire and bites into the twisting groove between the stranded wires, Along this biting wire twisting groove, the snow slides and rotates on the circumferential surface of the wire due to its own weight, and slides down to the lower position of the wire in the span. In this way, the snow adhering to the wires slides and rotates along the wire twisting grooves on the surface of the outermost layer of the wire, and slides down the wire surface to a low position and becomes a snow mass, which eventually forms a large cylindrical snow mass. It grows and enlarges into a snowpack. The weight of this cylindrical snow accumulation over the entire length of the electric wires in the span becomes an extremely large load, causing accidents such as breakage of stranded electric wires and collapse of steel towers.

In order to prevent this snow accretion accident, conventionally, in smooth body type electric wires in which the outermost stranded wire surface of aluminum wire or steel wire is made smooth, one or two threads are added to the stranded wire on the outer peripheral surface of the outermost layer. A method is known in which ridges are provided in the longitudinal direction to prevent snow from sliding and from growing into snow pipes.

In addition, as in the snow-prevention electric wire of Utility Model Publication No. 52-28142, a large number of protrusions made of hard polyethylene or the like are glued or heat-sealed to the surface of bare stranded wires or coated wires, and are placed randomly on the outer circumferential surface of the wire. An electric wire is known in which the random hard polyethylene protrusions prevent snow on the circumferential surface of the wire from sliding and rotating, thereby preventing the snow from growing and enlarging.

Also, like the snow protection electric wire of Utility Model No. 11371,
In electric wires that are designed to prevent snow from accumulating by blocking rotation of the snow by using insulator protrusions provided in the longitudinal direction of the insulation coating, tracking resistance is reduced due to a decrease in surface insulation resistance due to continuous staining of the insulator protrusions in the longitudinal direction. In order to prevent the wire from deteriorating, insulator protrusions are provided intermittently at intervals on the wire circumferential surface, and these spacings break the continuity of continuous staining of the insulator protrusions in the longitudinal direction of the wire to maintain tracking resistance. Electric wires designed to do this are known.

[The problem that the idea aims to solve]

In the above-mentioned smooth body type electric wire in which the stranded wires on the surface of the wire are provided with protrusions in the longitudinal direction, the stranded wires provided with the protrusions are twisted in the same direction and at the same pitch as the outermost layer stranded wire. As a result, the snow that has adhered to the wire slides and rotates along the ridges on the wire surface due to its own weight and slides down to the lower part of the wire, which gradually grows into a large cylindrical snow. There is a problem in that it is impossible to prevent snow accretion accidents on overhead power lines that occur as a result of the snow accretion growing and enlarging.

Furthermore, as in the snow-accumulation prevention electric wire of Utility Model Publication No. 52-28142, electric wires are made by randomly adhering a large number of protrusions made of a different material, such as hard polyethylene, to the surface of bare stranded conductive metal wires. However, there are problems in that the bonded protrusions easily break or fall off due to the sliding rotation of the snowpack on the circumferential surface of the electric wire, which hinders the prevention of snow buildup, and it is not easy to manufacture.

In addition, electric wires in which insulator protrusions are provided intermittently at intervals in the longitudinal direction of the insulation coating, such as the snow-proof electric wire of Utility Model Application Publication No. 11371/1984, are subject to continual staining of the insulator protrusions in the longitudinal direction. In order to prevent the tracking resistance from deteriorating due to the insulator protrusions, the insulator protrusions are provided intermittently at intervals to prevent continuous contamination of the insulator protrusions, and the surface of the insulating coating at these intervals has no protrusions. Since there is no part, it is not possible to prevent snow from sliding and rotating on the surface of the insulating coating at this interval, and therefore, even if a decrease in tracking resistance can be avoided, the snow accretion prevention effect is impaired. There is.

The present invention solves the above-mentioned problems and provides a snow-resistant overhead electric wire that can completely prevent snow from accumulating on the circumferential surface of the electric wire from slipping and rotating, and is easy to manufacture. The purpose is to

[Means to solve the problem]

In order to achieve the above object, the snow-resistant overhead electric wire of the present invention has protrusions 2 and flat protrusions 3 formed by crushing the protrusions formed alternately on the metal wire 1 in the longitudinal direction. The metal wire 1 is connected to the twisted wire 4 of the electric wire.
The above-mentioned wires are twisted together with the outermost layer of stranded wires to form a snow-resistant overhead power line.

[Effect]

When the snow attached to the electric wire tries to rotate while sliding on the circumferential surface of the electric wire in the circumferential direction, the protrusions 2 and flat protrusions 3 of the metal wire 1 protrude from the outermost surface of the strands 4 of the electric wire. , the sliding rotation of snow on the circumferential surface of the electric wire in the circumferential direction is prevented.

In the gap between each protrusion 2 on the circumferential surface of the wire,
The surface of the wire is not a smooth surface, but a flat protrusion 3
Therefore, the flat protrusion 3 prevents snow from passing between the protrusions 2, 2 and rotating, and the sliding rotation in the circumferential direction of the circumferential surface of the electric wire is completely prevented. be done.

The flat protrusions 3 provided between the respective protrusions 2 of the metal wire 1 are formed by partially crushing the continuous protrusions 2 at intervals, so that the edge of the crushed upper surface The protrusions 3 become burr-like and protrude flatly, and such flat protrusions 3 are provided between the protrusions 2.

These protrusions 2 and the flattened protrusions 3 provided between them are such that snow accretion on the surface of the electric wire slides along the protrusions 2 of the metal strands 1 in the longitudinal direction of the electric wire in the lower longitudinal direction on the circumferential surface of the electric wire. When the snow tries to slide down, the snow gets caught on the step edges between the protrusions 2 and the flattened protrusions 3, thereby preventing the snow from sliding down. In other words, snow that has fallen near the protrusion 2 gets caught on the burr-shaped protruding part of the flat protrusion 3, and snow that has fallen near the flat protrusion 3 gets caught on the end of the protrusion 2. , snow accretion is reliably prevented from sliding down the circumferential surface of the wire in the longitudinal direction along the longitudinal protrusions on the surface of the wire.

This reliably prevents snow from sliding and rotating on the circumferential surface of the wire in the circumferential direction and along the protrusions 2, sliding downwards and growing into a large cylindrical snow. The snow falls naturally from the overhead power lines before it grows into a heavy cylindrical snow, thereby preventing snow accretion accidents.

Projections 2 and flat projections 3 of the metal wire 1
Since it is formed integrally with the metal wire 1, there is no fear that the protrusion 2 and the flattened protrusion 3 will break even if snow falls on the surface of the wire and rotates.

Further, the protrusions 2 and the flat protrusions 3 can be easily formed integrally with the metal wire 1 by a continuous operation when drawing the metal wire 1.

Since the metal wire 1 provided with the protrusions 2 and the flattened protrusions 3 can be made of the same material as the other wires constituting the stranded wire 4, the durability (life) of the stranded wire is longer than that of normal twisted wires. It is the same as the electric wire, and even if the protrusion 2 and the flat protrusion 3 are provided, the life of the electric wire will not be impaired.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Figure 2 shows a metal wire provided with protrusions and flat protrusions according to the present invention, and Figure 1 shows the snow-resistant overhead electric wire of the present invention in which this metal wire is twisted into the outermost layer of the stranded wire. shows.

In FIG. 2, reference numeral 1 denotes a metal wire such as aluminum wire, copper wire, steel wire, etc., and this metal wire 1 is integrally and continuously provided with protrusions 2 in the longitudinal direction. are partially crushed at regular intervals to provide flat protrusions 3, and the protrusions 2 and flat protrusions 3 are alternately formed integrally on the metal wire 1 in the longitudinal direction. In order to form the protrusions 2 and the flattened protrusions 3 that are partially crushed at regular intervals, the metal strands 1
When drawing a line, the continuous protrusions 2 are formed continuously in the longitudinal direction, and the continuous protrusions are partially crushed at regular intervals, so that the edge of the upper surface becomes burr-like and protrudes flatly. The shaped protrusions 3 are formed alternately with the protrusions 2 at intervals.

As shown in FIG. 1, the metal wire 1 having the protrusions 2 and the flat protrusions 3 alternately provided in the longitudinal direction as described above is put together with the outermost layer of the twisted wire. By twisting one or more wires together, an electric wire consisting of a stranded wire 4 having a shape in which protrusions 2 and flattened protrusions 3 are alternately protruded from the surface of the outermost layer of the electric wire is formed, and the wire is difficult to attach according to the present invention. Snow constitutes overhead power lines.

When the electric wire of the present invention constructed as described above is installed with a predetermined slack between the steel towers, when snow adheres to the electric wire hanging curvedly in this span, this snow builds up on the surface of the electric wire due to its own weight. While sliding and rotating on the circumferential surface of the wire along the twisting groove between the twisted wires, it attempts to slide down to the lower position of the wire in the span, but the sliding rotation in the circumferential direction on the circumferential surface of the wire is Rotation is prevented by the protrusions 2 and flat protrusions 3 protruding from the surface of the electric wire.

In addition, when the snow on the surface of the electric wire tries to slide down the circumferential surface of the wire in the longitudinal direction along the protrusions 2 of the metal wire in the longitudinal direction of the electric wire, the snow accreted on each protrusion 2, 2
The snow that gets caught between the step edge and the flat protrusion 3, that is, the snow near the protrusion 2 gets caught on the burr-like protruding part of the flat protrusion 3, and the snow near the protrusion 3 Since snow is caught at the end of the protrusion 2, it is prevented from sliding down along the protrusion 2 in the longitudinal direction on the surface of the wire.

In this way, the snow is prevented from sliding down the wire while rotating in the circumferential and longitudinal directions, ensuring that it grows into a heavy cylindrical snow. This prevents snow from accumulating, allowing small snowflakes to fall naturally, and thereby preventing snow accretion accidents.

[Effect of idea]

As mentioned above, in the present invention, the metal wire 1, which is integrally provided with projections 2 and flat projections 3 in the longitudinal direction, is twisted together with the outermost twisted wire of the wire, and the projections are formed on the surface of the wire. 2 and the flat protrusions 3 protrude alternately to form a snow-resistant overhead electric wire, so even if snow accumulates, slip rotation in the circumferential direction and longitudinal direction on the circumferential surface of the electric wire can be reliably prevented. , the snow does not grow into a large cylindrical snow pile, and the occurrence of snow accretion accidents can be reliably prevented.

In addition, since the protrusions 2 and the flat protrusions 3 of the metal wire 1 are formed integrally with the metal wire 1, even if the snow falls and rotates, the protrusions 2 and the flat protrusions will not be affected as in the conventional case. 3 is safe and can withstand long-term use without fear of breakage.

Furthermore, the protrusions 2 and the flat projections 3 that are integral with the metal wire 1 can be easily formed in a continuous operation when drawing the metal wire 1.

Furthermore, since the metal wire 1 provided with the protrusions 2 and the flattened protrusions 3 can be made of the same material as the other wires constituting the stranded wire 4, the durability of the stranded wire is lower than that of a normal stranded wire. They are the same, and even if the protrusion 2 and the flattened protrusion 3 are provided, there is no risk that the service life will be impaired.

[Brief explanation of the drawing]

FIG. 1 is a front view of a snow-resistant overhead electric wire according to an embodiment of the present invention, and FIG. 2 is a perspective view of the metal wire. 1...Metal element wire, 2...Protrusion, 3...Flat-shaped protrusion, 4...Twisted wire.

Claims (1)

[Scope of utility model registration request] A stranded metal wire is provided alternately with protrusions and flat protrusions obtained by crushing the protrusions in the longitudinal direction, and the metal wire is twisted together with the outermost layer of the stranded wire. overhead power lines.