JPH0438111A - Torsion preventer for accompanied wire type overhead line - Google Patents

Abstract

PURPOSE:To prevent a transmission line from twisting due to accretion of snow by fixing a wire body, laid along the underside of an overhead transmission line with higher wire density than that of the transmission line, to the transmission line while winding an armor rod. CONSTITUTION:A single wire body 1 or a plurality of wire bodies 1a, 1b, 1b having higher wire density than that of a transmission line A is/are laid, by a predetermined length, on the underside of the transmission line A. A single armor rod 2 or a plurality of armor rods 2, 2' is/are then wound integrally around the transmission line A and the wire body 1 or the wire bodies 1a, 1b, 1b. Accretion of snow on the surface of the transmission line A causes downward force of gravity to produce torsional moment in the transmission line A, but the torsional moment is canceled by the drag moment due to eccentricity of the accompanied wire body 1. Consequently, development of excessive snow tube due to rotation of accreted snow can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for preventing twisting of overhead lines due to ice and snow accumulation.

[Conventional technology] When snow adheres to a power transmission line, the snowflakes grow into a cylindrical shape as they slide and rotate on the surface of the wire.The eccentric moment of this rotating snowflake twists the wire itself, causing the snowflake to rotate further around the wire. However, the snow rapidly grows into a large pile of snow, which poses a risk of accidents such as drooping and breaking of electric lines, deformation of tower supports, and collapse.

The growth of snow pipes due to the rotation of snowflakes is caused by the fact that the electric wires themselves are twisted.

In order to prevent this twisting of the electric wires and snow damage accidents, conventionally, as shown in FIG.
The anti-twist device 10 is installed at intervals of 0 to 100 m, and the eccentric moment of this anti-twist device 10 increases the resistance against twisting of the electric wire caused by snow accumulation, thereby preventing the twisting of the electric wire.

"Problem to be solved by the invention" If the power transmission line is not twisted, snow will accumulate on the side of the power transmission line on the windward side, and when this snow is exposed to the wind, large-amplitude vibrations called gearropping occur, resulting in low-frequency vibrations. The large-amplitude vertical vibrations of the power transmission line may cause the lower power line to jump up until it comes into contact with the upper power line, causing a phase-to-phase short circuit accident.

When a power transmission line to which a conventional twist preventer 10 is attached jumps upward, the twist preventer 10 of the lower power transmission line w1 jumps upward to the upper power transmission line w2, as shown by the broken line in FIG. As shown in the arrow, there is a danger that if the wire gets stuck and gets stuck, it will become stuck and become stuck, resulting in a permanent short circuit and a large-scale power outage.

Furthermore, the conventional kink preventer has a problem in that the drag moment against twisting of the electric wire is constant and it is not possible to obtain various drag moments.

The present invention provides a wire-type overhead wire that can be easily removed without getting caught even if it comes into contact with a power transmission line of a different phase, and that can obtain various drag moments and reliably prevent twisting. The purpose is to provide an anti-twist device.

[Means for Solving Eight Problems] In order to achieve the above object, the attached wire type overhead wire twist preventer of the present invention includes: (1) attaching an attached wire body to the lower side of the overhead power transmission line; (2) The linear density of the attached filament is equal to or higher than that of the overhead power transmission line. .

[Operation: The attached filament attached to the underside of the overhead power transmission line has a drag moment against the twisting of the power transmission line, thereby increasing the resistance against the twisting of the wire caused by snow accumulation, thereby increasing the resistance of the wire. Prevents twisting and prevents snowflakes from growing due to rotating snowflakes.

The attached wire body, which is attached by winding an armor rod along the underside of the overhead power transmission line, will prevent the power transmission line from gear-ropping and jumping up to the upper power transmission wA, causing the torsion preventer to run aground. However, unlike conventional torsion preventers, there is no protruding part that can catch on the power transmission line above, and the attached wire body has a restoring force due to its elasticity and flexibility, so it does not deform due to that restoring force. However, it can easily detach from the power transmission line and quickly return to its original position.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the overhead wire torsion preventer of the present invention, and FIG. 2 shows a cross section taken along the line ■--■ in FIG.

1 is one or more attached wires of a predetermined length that are installed along with the overhead power transmission line A, and this is a wire that is transmitted using a steel-core aluminum stranded wire with the same configuration as the power transmission line. A wire having a linear density similar to or higher than that of an electric wire is used, but a rigid body may also be used, or a covered wire such as a cross-linked polyethylene covered wire may be used.

2 is an armor rod consisting of one or more spirally formed filaments.

The attached striated body 1 is attached to the lower side of the overhead power transmission line A,
This attached wire body 1 and overhead power transmission line A are collectively armored.
By winding the rod 2, the attached wire body 1 is connected to the overhead line power transmission I! The overhead wire torsion preventer of the present invention is installed along the lower side of A.

In addition, in FIG. 1, the length of the attached filament 1 and the winding of the armor rod 2 are shown to be approximately the same length, but even if one is made longer or shorter, Alternatively, the armor rod 2 may be wound electrically in contact with each other instead of being wound with a gap between turns as shown in the figure.

In addition, when attaching the attached wire body 1 to a long length and attaching it to the power transmission line A, a plurality of long attached wire bodies 1 are attached to the lower side of the overhead power transmission line A as shown in the third diagram. Set of armor rods 2.2'
It may also be wrapped at appropriate intervals. In this way, compared to the case where the armor rod is wound over the entire length of the attached filament 1, the winding effort is reduced and it becomes economical.

In this case, the attached wire body 1 in the area where the armor rod is not wound is liable to be damaged by constantly sliding in contact with the electric wire, so to prevent this damage, the attached wire body 1 is made of, for example, cross-linked polyethylene A covered wire or the like may also be used.

FIG. 4 schematically shows a state in which the attached filament 1 of the torsion preventer of the present invention constructed as described above is attached to the power transmission lines of each phase of spans A1, A2, and A3 by armor rods 2. It is something.

As described above, the overhead wire twist preventer of the present invention is attached to the overhead power transmission line A to prevent the power transmission line A from twisting.

When ice and snow form on the surface of power transmission line A, a downward force due to gravity is generated on the snow and ice, creating a twisting moment on power line A. Since the body 1 is eccentric with respect to the power transmission line A, it acts as a drag moment against the twisting moment of the power transmission line and prevents the power transmission line from twisting. This prevents excessive snow from developing due to rotation of the frozen snow.

In order to further increase the drag moment caused by the attached filament 1 and to enhance the effect of preventing the development of snow, the attached filament 1 may be composed of a filament with a high density, or the structure shown in FIG. In this way, the attached filament body 1 may be constructed by adding a plurality of filament bodies 1b to the filament body 1a to increase the density. If such an attached filament body 1 is attached to the lower side of the power transmission line A, and the armor rod 2 is wrapped around it and attached to the power transmission line A, the drag moment increases and the twist prevention effect becomes greater. .

As shown in Figure 4, if the above-mentioned attached wire type overhead wire torsion preventer is installed at each required location of the power transmission line in the span, the twist prevention effect can be further enhanced. By changing the density of the striations and the length of the filaments, the drag moment can be adjusted as desired.

In addition, the attachment type overhead line torsion preventer of the present invention, in which the attached wire body 1 is attached to the power transmission line by the armor rod 2 as described above, is designed to prevent the power transmission line from moving downward when it causes large-amplitude vibration due to gear lopping. For example, the power transmission line A2 shown in Figure 4 is the upper power transmission line ^
Even if the power line A2 were to spring up and come into contact with the power line A2, the twist preventer can be installed to prevent the power line A2 from twisting because it has an almost circular cross-sectional shape and there are no protrusions that could get caught on the wire. There is no risk of the device getting caught and entangled with the transmission line of the other phase, and even if the torsion preventer rides on the transmission line of the other phase, the attached wire body 1 and the armor rod 2 maintain their elasticity and visibility. Since it can be easily deformed due to the restoring force, it can be quickly detached from the other party's power transmission line, which prevents a long-term short circuit accident.

[Effects of the Invention] As mentioned above, the attached wire type overhead wire torsion preventer of the present invention is configured such that the attached wire body is attached to the overhead power transmission line with an armor rod, so that it can withstand various torsional moments of the wire. It is possible to set various drag moments that appropriately correspond to the above, and the effect of preventing twisting of overhead power transmission lines is great.

In addition, even if the power transmission line vibrates with a large amplitude, it will not get caught and entangled with the transmission lines of other phases, unlike conventional methods, so there is no risk of long power outages. It is.

[Brief explanation of drawings]

Figure 1 is a front view of one embodiment of the present invention, and Figure 2 is the same as Figure 1.
-■ line sectional view, Figure 3 is a front view of another embodiment, Figure 4 is a diagram of the installation state of the span, Figure 5 is a sectional view of another actual example, and Figure 6 is a sectional view of another example.
The figure shows a conventional example. 1; Attached striatum 2 Near Marrod A, AI, ^
2, ^ 3; Overhead power transmission line Figure 3 Figure 4 Figure 5 Patent applicant Furukawa Electric Co., Ltd.

Claims (2)

[Claims] (1) A wire-type overhead wire torsion preventer characterized in that an attached wire body provided along the lower side of an overhead power transmission line is attached to the power transmission line by winding an armor rod. (2) The attached wire type overhead wire twist preventer according to claim 1, characterized in that the linear density of the attached wire body is equal to or higher than the linear density of the overhead power transmission line.