JPH0536713U - Low lift force snow-dried wire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a low-lifting snow-adhesion wire that does not cause lift due to wind and has a large snow-adhesion effect. [Structure] A plurality of single-core round electric wires 4 are twisted together, and these are put and connected in the same phase.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a snow-adhesion-resistant electric wire used as a transmission line, and particularly to a low-lifting snow-adhesion-resistant electric wire in which lift due to wind is small.

[0002]

[Prior Art]

 Snow on the wires grows as follows. That is, during snowfall, the amount of snow adhered to the upper surface of the wire is larger than that on the lower surface. Causes the wire to rotate along the outer peripheral surface. By this rotation, the snow on the upper surface of the wire becomes the lower surface of the wire, and new snow can be seen on it. When this snowfall reaches a certain limit, the snow that has adhered rotates again around the outer circumference of the wire, and new snowfall is made on the snow on the lower surface before the rotation. By repeating the above process, snow accretion on the outer circumference of the wire grows in a cylindrical shape. If the above-mentioned snowfall becomes remarkable, an accident such as excessive hanging of the electric wire or cutting due to the weight of snowfall will occur. In order to prevent such an accident, a parallel two-piece fin-resistant snow wire 1 has been developed as shown in FIG. This parallel two-blade snow-holding wire with fins has fins 2 and 2 located at both ends of the diameter on the outer peripheral surface of the wire and parallel to the axis. The two fins 2 and 2 adhere to each other. The above-mentioned rotation of the snow is hindered, and the rotational force of the snow is transmitted to the electric wire through the fins 2 and 2, and the electric wire is twisted. Due to this twist, the snow accumulated on the upper surface of the wire collapses, so that cylindrical growth of snow, that is, snow accretion is prevented.

[0003]

[Problems to be solved by the device]

 However, when the fin hits the wire with wind, a lift force is generated, and the wire is pulled upward in the span, which may cause the wire to be cut depending on the wind force.

The present invention has been made in view of the above circumstances, and provides a low lift-resistant snow-driving wire that has a low lift generated by wind and has a large snow-draining effect.

[0005]

[Means for Solving the Problems]

 The low lift-resistant snow-adhesive wire of the present invention is characterized in that a plurality of in-phase single-core round wires are twisted together.

[0006]

[Action]

 In the low lift difficult-to-snow wire with the above structure, since the wire is composed by twisting multiple single-core round wires, the attached snow cannot rotate along the outer circumference of the wire. The difficult-to-snow wire is twisted by the snow that is about to rotate, and the twist causes the snow to drop. In addition, the round wire does not generate lift due to wind, and the lift is also minimized in the snow adhering wire of the present invention formed by twisting the wires.

[0007]

【Example】

 FIG. 1 is a cross-sectional view of an embodiment of the present invention. In this figure, the low lift-resistant snow-adhesive wire 3 of the present invention is constructed by twisting three single-core round electric wires 4. In addition, these round wires shall be in phase. The round electric wire is, for example, for 6.6 kv, and is made of hard aluminum stranded wire as a conductor and has an insulating coating of crosslinked polyethylene.

In the snow-resistant electric wire of the present invention having the above-described structure, since it is a stranded wire, rotation of the snow accumulated on the upper surface thereof along the outer peripheral surface of the electric wire is hindered, and the electric wire is twisted by the weight of snow and twisted. As a result, the snow on the top surface of the wire does not fall and does not grow in a cylindrical shape, so the effect of preventing snow accretion can be obtained.

On the other hand, since the snow-adhesive wire of the present invention is formed by twisting round electric wires that do not generate lift, the twisted portion is only slightly affected by wind. Therefore, even if such a local influence is exerted, since the affected portion rotates once with the twist pitch, the above influences cancel each other out, and it should be considered that there is no wind influence. You can It goes without saying that in a three-phase three-wire type power line, three wires of the above-configured electric wire of the present invention are installed.

The low lift-resistant snow-adhesive wire of the present invention has a slightly larger finished outer diameter than a single round wire having the same performance, but it has a large outer diameter that poses a problem in use. It is never the diameter. Also, the estimated weight is about 20% lighter than that of the equivalent performance.

The present invention is not limited to the above embodiment. The number of single-stranded wires may be two or four or more.

[0012]

[Effect of the device]

 As is clear from the above, since the snow-diffusing electric wire of the present invention can be constructed by twisting a plurality of single-core electric wires, it should have a special shape like the conventional fin-resistant snow-adhesive electric wire. Therefore, the cost can be low.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional snow-adhesive wire.

[Explanation of symbols]

 1 ... Difficult to snow wire 2 ... Fin 3 ... Low lift force snow wire of the present invention 4 ... Single core round wire

Claims (1)

[Scope of utility model registration request] 1. A low lift-resistant snow-adhesive wire comprising a plurality of single-phase circular wires of the same phase twisted together.