JP2795530B2 - Overhead wire twist prevention device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for preventing an overhead transmission line from being twisted.

[Prior Art] When snow accumulates on a power transmission line, snowflakes rotate while sliding on the surface of the electric wire and grow into a cylindrical shape, and the electric wire itself is twisted, rapidly growing into large cylindrical snow, and drooping, disconnection, and steel tower support of the electric wire. Deformation,
In order to prevent the wire from being twisted, a torsion preventer 10 having a weight attached to the clamp arm as shown in FIG. 3 is attached to the transmission line w to prevent the wire from being twisted due to snow accretion. Although the wire is twisted and the snow accumulates in the form of wings to the side of the wire without twisting, the wire causes galloping vibration due to the lift by the wind, and the wire jumps up and contacts the upper wire as shown in FIG. As shown by the dotted line, the torsion preventer 10 may be caught by the upper electric wire and may not come off, leading to troublesome recovery and a large-scale long-term power failure.

Japanese Patent Application Laid-Open No. H08-216, in which a flexible tubular shaping wire of a spiral rod bundle attached to a power transmission line is wound around a core material so as to prevent the torsion preventer from catching on another electric wire. The applicant has previously developed the twist prevention device for overhead wire of No. 112658.

[Problems to be Solved by the Invention] In the twister for overhead wires described above, since the spiral rod is wound around the core material in a nectar manner, not only line floating, deformation, unraveling, etc. occurs, but also the thickness of the electric wire is reduced. In addition, it is difficult to wind the spiral rod bundle around the electric wire due to the thickness and pitch of the strand.

Also, snow accumulates more easily on the wire than the slack flexible tubular shaping, and the snow accretion may fall and damage the structures under the power transmission line.

SUMMARY OF THE INVENTION An object of the present invention is to provide an overhead wire twist preventing device which is easy to wind around an electric wire and does not cause large snow accumulation.

[Means for Solving the Problems] In order to achieve the above object, the twisting device for an overhead wire according to the present invention comprises: (1) a first spiral rod bundle on the outer periphery of the filament core material 2;
The first and second spiral rod bundles 1a and the second spiral rod bundle 1b are coarsely wound without being in close contact with each other with a slight gap g1 therebetween. The bundles 1a, 1b are twisted to form twisted constrictions 4, 4, and the spiral rod bundles 1a, 1b on the tip side from the constriction constrictions 4, 4 are wound in close contact with each other. (2) the first and second spiral rod bundles 1a and 1b are connected to a plurality of spiral rods. Are bonded to each other, and both ends of each spiral rod bundle of the electric wire coarsely wound portions 5 and 5 are formed into linear portions 6 and 6.

[Operation] Since the torsion preventer 1 has the core member 2, the torsion preventer 1 has a predetermined drag moment against the torsion of the transmission line, and the effect of preventing the torsion of the transmission line due to snow accretion is increased.

By roughly winding the two spiral rod bundles 1a and 1b around the linear core material 2, the flexibility is increased, and the work of winding around the transmission line is facilitated.

The twisted constrictions 4, 4 increase the flexibility of the spiral rod bundle at this portion, and facilitate forming slack when wound around a power transmission line.

The twisted constrictions 4 prevent the core 2 from falling off when the transmission line vibrates.

The first and second spiral rod bundles 1a and 1b are coarsely wound around the core material 2 and the coarsely wound wire portion 5 is roughly wound around the transmission line, so that the snow accretion causes the surface of the twisted wire to have a twist pitch. This prevents rotation while sliding along the road, preventing the snow from developing into large cylindrical snow, and reducing the amount of snow covered near the twist prevention device 1.

By bonding a plurality of spiral rods and joining the spiral rod bundles together, the spiral rod bundles are prevented from loosening.

Spiral rod bundle 1 at each end of wire coarse winding part 5,5
By forming the tip portions of a and 1b in the linear portion 6,
Even when the ends of the spiral rod are bundled, the winding work on the electric wire is facilitated.

Even if the transmission line equipped with the torsion preventer 1 causes galloping vibration and jumps up to the upper transmission line, it returns downward without being caught by the elasticity of the spiral rod bundle and the restoring force due to flexibility. And no major power outages will occur.

Examples Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which an overhead wire twist prevention device according to an embodiment of the present invention is attached to an overhead power transmission line, and FIG. 2 shows the overhead wire twist prevention device before the overhead wire is attached to the power transmission line.

In FIG. 2, reference numerals 1a and 1b denote first and second two spiral rod bundles. Each of the spiral rod bundles was formed by arranging a plurality of spiral rod strands formed by spirally forming a steel wire, an aluminum-coated steel wire, a copper wire, and other wires in a spiral shape, and forming a bundle of spiral rod strands. Each of the strands is adhered to each other with an appropriate adhesive, and joined together so that the strip-shaped spiral body does not collapse.

Numeral 2 is a linear core material having a circular cross section formed to an appropriate length using a stranded steel wire, a wire rope, lead, or a deformable rod-shaped body divided into a required length, the diameter of which is a twist preventing device. It should be equal to or larger than the diameter of the transmission line to be installed.

Reference numerals 3 and 3 denote terminal caps made of aluminum or plastic, which are fitted to both ends of the core material 2 in order to prevent the ends of the wires constituting the linear core material 2 from being loosened.

The first spiral rod bundle 1a and the second spiral rod bundle 1b are wound around the outer periphery of the linear core material 2 without being closely contacted with each other, and a slight gap g1 is left between them. Wrap around the state.

Thus, the core material 2 is provided inside the spiral rod bundles 1a and 1b.
Therefore, the transmission line has the required weight and prevents the transmission line from being twisted due to snow accumulation.

On both sides of the terminal caps 3, 3 at both ends of the linear core material 2, the first and second spiral rod bundles 1a, 1b are twisted at least once or more to form twisted constrictions 4,4. Thereby, both spiral rod bundle portions are integrated at the constricted portion. The two spiral rod bundles 1a and 1b are separated from the twisted constrictions 4 and 4 again.

From the above-mentioned twisted constricted portions 4, 4, the separated spiral rod bundle portions form the wire coarsely wound portions 5, 5.

The distal end portions of the spiral rod bundles 1a and 1b at the respective distal end portions of the electric wire rough winding portions 5 and 5 are formed in a linear portion 6. By forming the ends in a straight line in this manner, even when the ends of the spiral rod formed of a steel wire, an aluminum-coated steel wire, or the like are bundled, the winding of the ends around the electric wire becomes easy, Further, since the two spiral rod bundles 1a and 1b are coarsely wound around the linear core material 2, the flexibility is increased, so that the work of winding around the power transmission line becomes easy.

As shown in FIG. 1, the overhead wire torsion preventer 1 of the present invention configured as described above is configured such that the spiral rod bundle ends of the wire coarse winding portions 5, 5 at both ends are wound tightly without being closely contacted. With a slight gap g2 and wrap it around transmission line w
The middle part around which the spiral rod bundle is wound,
The wire is slackened at a predetermined distance d between itself and the transmission line w.

The slack interval d is appropriately changed and set in accordance with the size of the electric wire w, the assumed snowfall amount, the span length, and the like.
For example, the material and length of the linear core material 2 are selected, adjusted, and set.

Reference numerals 7 and 7 denote transmission lines w to prevent the spiral rod bundle from sliding on the surface of the transmission line w and scratching the surface of the transmission line.
The elastic collar is fitted with a rubber cylinder body and the like and is provided with a slit.

An index such as a red mark is given to the twisted constricted portions 4 and 4 and the red mark index position is wound around the positions of the collars 7 and 7 fitted to the power transmission line w. Winding is easy, and uniform construction can be performed.

In addition, since the twisted constricted portions 4 and 4 are formed at both ends of the linear core material 2, the core material 2 does not fall out even if the power transmission line w vibrates.

The torsion preventer 1 attached to the transmission line as described above has a predetermined resistance moment against the torsion of the transmission line by holding the core member 2 and prevents the electric wire from being twisted due to snow accretion.

As described above, the maximum length of the twist prevention device 1 attached to the power transmission line w should not exceed the minimum insulation interval determined by the voltage of the power transmission line, and one end of the twist prevention device 1 wound on the power transmission line w may come off. Prevent flashing so long that it does not touch the underlying power line if it hangs down.

As described above, the first and second spiral rod bundles 1a and 1b are coarsely wound around the core material 2 with an interval g1 therebetween, and the wire coarse winding portions 5 and 5 at both ends are also spaced apart from the transmission line w with an interval g2. Since it is roughly wound, the core material 2 and the electric wire w and the spiral rod bundles 1a and 1b
If the winding pitch is made different, it is possible to prevent the snowflakes from rotating and developing into a cylindrical shape while sliding on the wire surface along the winding pitch even when snow accumulates.
, The amount of snow covered in the area can be reduced.

When the torsion preventer 1 of the present invention is mounted on the overhead transmission line w, the transmission line generates galloping vibration as shown in FIG. 3 and jumps up to the upper transmission line as shown by the dotted line to be hooked. Even if it tries, it will come off and return to the original position due to the elasticity of the spiral rod bundle and the restoring force due to the flexibility, so that the anti-torsion device will catch on the upper electric wire and cause a large-scale power failure accident as before. Disappears.

[Effects of the Invention] As described above, in the twist prevention device of the present invention, since the core material is provided in the spiral rod bundle, the twist prevention effect of the transmission line due to snow accretion is increased.

In addition, since the two spiral rod bundles are roughly wound, the flexibility of the twist prevention device is increased, and the work of winding the wire around the power transmission line is facilitated. Therefore, snow damage accidents are prevented because the snow does not develop into large cylindrical snow.

In addition, since twisted constricted portions are formed on both sides of both ends of the core material, the flexibility of the spiral rod bundle is increased, forming a slack between the transmission line and the winding operation is facilitated. The core material does not fall off even when vibrated.

Furthermore, the spiral rod bundle is glued and does not come loose,
By forming the end portion of the spiral rod bundle of the wire coarse winding portion into a linear portion, the winding work on the wire becomes easy.

Further, even if the transmission line vibrates and jumps, the torsion preventer does not get caught on the upper electric wire, thereby preventing the occurrence of a large-scale power failure.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention, FIG. 2 is a front view of a spiral rod bundle, and FIG. 3 is an explanatory view of the operation of a conventional torsion preventer. 1; twist prevention device 1a, 1b; spiral rod bundle 2; linear core material 4; twisted constricted portion 5; wire coarsely wound portion 6; straight portion w: transmission line

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-198519 (JP, A) JP-A-59-44915 (JP, A) JP-A-62-163511 (JP, A) 6526 (JP, U) Fully open 52-37281 (JP, U) Fully open 1542-12796 (JP, U) Fully open 60-103217 (JP, U) Fully open 61-25029 (JP, U) JP-B-44-995 (JP, B1) JP-B-43-12924 (JP, Y1) JP-B-34-9358 (JP, Y1) JP-B-44-11786 (JP, Y1) JP-B-56-15884 (JP, Y2) Jikken Sho 51-24551 (JP, Y2) Jigoku Sho 55-38206 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 7/00-7 / twenty two

Claims (2)

(57) [Claims] A first and a second bundle of spiral rods are roughly wound around the outer periphery of a filament core material, and the first and second spiral rod bundles are twisted on both sides of both ends of the core material. A twist prevention device for an overhead wire, characterized in that a constriction portion is formed, and a rough wire winding portion for roughly winding the wire around the wire is formed at the end of the spiral rod bundle on the distal end side from the twist constriction portion. 2. A spiral rod bundle is formed by adhering a plurality of spiral rods, and an elastic body collar is attached to the electric wires in the vicinity of the constriction portions 4 and 4 for starting winding of the electric wires. The overhead wire twisting prevention device according to claim 1, wherein the overhead wire is twisted.