JP2002117727A - Electric wire with heat sensitive rotation detecting mark - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire with a heat sensitive rotation detecting mark in which a rotation detecting mark on the surface of an electric wire is kept until stringing and made to disappear in line operation after stringing. SOLUTION: The heat sensitive mark keeping color in stringing but making the color disappear or unobtrusive by detecting heat caused by power transmission after stringing is used as a strip-shaped mark for detecting torsional rotation in the length direction applied to the surface of the electric wire to be strung. As preferable examples of the heat sensitive mark. Thermopaint (R) whose color is obtrusive at normal temperature but made to disappear or unobtrusive at high temperature is listed, or a material whose color is made to disappear or unobtrusive at 60 deg.C, or a material whose color is made to disappear or unobtrusive at a certain temperature but color change is irreversible is listed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire provided with a mark for detecting the rotation of the electric wire at the time of the overhead wire, and in particular, the mark is displayed until the overhead wire, and at the time of power transmission (heating) after the overhead wire. The present invention relates to providing a heat-sensing type wire with a rotation detection mark that disappears. "Electric wire" refers to a main line of an overhead transmission line (steel core aluminum stranded wire; ACSR, etc.) and an optical fiber composite overhead ground wire (OPGW).

[0002]

2. Description of the Related Art In an imaginary electric wire, for example, an OPGW, a mark for detecting rotation is provided in order to control the number of twists at the time of an overhead wire. The surface is marked with a color with good visibility; a conspicuous color mark is applied in a band shape in the longitudinal direction of the electric wire at about half the circumference of the electric wire. When the wire with the band-shaped mark is twisted in this way, the band-shaped mark provided for only about a half turn also rotates in the circumferential direction of the wire, so that the mark (color) appears when the surface of the wire is viewed from a certain position. A portion where a portion and a mark (color) do not appear occurs, and it is possible to detect how much the twist has been made based on the visual recognition of the color and the frequency of appearance of the color.

[0003] Detection of the rotation of the electric wire as described above is performed by an OPGW.
As described above, the optical fiber is housed in the ground wire portion, and when the electric wire is twisted, the electric wire is elongated, and it is particularly necessary to manage the upper limit value at which stress is applied to the optical fiber inside.
Managing the stress value of an optical fiber is very important because it also affects the life of the optical fiber. In addition, since the service line in the substation is short, a clamp is installed on the ground in advance and attached to the steel tower.However, when attaching this clamp to the electric wire, it is necessary to shift the upper and lower positions of the clamp up and down with respect to each other. , Because the rigidity of the wire is effective (because it is short), even if one is combined,
The other side may be twisted and not be able to be attached properly. In order to solve this problem, a rotation detection mark is provided (applied) on the electric wire so that the electric wire can be twisted so that the clamps are not twisted and attached to each other.

[0004]

As described above, in order to detect twisting of an electric wire at the time of an overhead wire or to prevent twisting, a rotation detection mark is provided by giving a band-like color that is prominent in the surface longitudinal direction of the electric wire. However, the rotation detection mark is not necessary at all during the operation of the track after the overhead wire work is completed. On the contrary, it is marked with a prominent color, which would hurt the scenery at tourist spots. In addition, there are many cases where aluminum wire such as a drop wire is set at a low position where it is easily noticeable, and the color of the mark on the electric wire surface is too conspicuous, and there have been complaints that surprised people.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the object of the present invention is to display a rotation detection mark on the surface of an electric wire up to the time of an overhead wire, and to operate the line after the overhead wire. An object of the present invention is to provide a heat-sensing type electric wire with a rotation detection mark, in which the rotation detection mark can disappear.

[0006]

Means provided by the present invention: a wire with a heat-sensing type rotation detecting mark is a band-shaped mark provided for detecting a torsional rotation of the wire in the longitudinal direction of the surface of the wire to be installed. A heat-sensing mark which has a color at the time of the overhead wire but detects heat generated by power transmission after the overhead wire and loses its color or becomes inconspicuous is used.

As described above, according to the wire provided with the heat sensing type mark, the wire is twisted up to the time of the overhead wire; if the wire is twisted, the band-shaped mark also rotates in the circumferential direction of the wire. When the surface is viewed from a certain position, a portion where the mark (color) appears and a portion where the mark (color) does not appear occur, and it is possible to detect how much the twist has been made based on the visual recognition of the color and the frequency of the appearance of the color. On the other hand, at the time of power transmission after the overhead line, that is, at the time of high temperature, the mark is discolored by sensing heat, the color disappears or becomes almost inconspicuous, and the landscape is not spoiled.

A preferred specific example of the heat-sensitive mark is a thermopaint which has a color that is conspicuous at room temperature, but disappears or becomes inconspicuous at high temperatures. At 60 ° C., the color disappears or becomes inconspicuous. Furthermore, it is irreversible, in which the color does not return after disappearing or becoming inconspicuous at a certain temperature.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. FIG. 1 schematically shows an electric wire with a heat-sensing type rotation detecting mark according to the present invention. The thermopaint 2 is applied in a strip shape in the longitudinal direction on about half the circumference of the surface of the electric wire 1.

The thermopaint 2 may be any material as long as it discolors due to heat generated by Joule heat generated when a current flowing through an electric wire or an induced current flows. The following Table 1 shows the maximum always allowable temperature of ACSR (steel core aluminum stranded wire), TACSR (steel core heat resistant aluminum alloy stranded wire), and OPGW (optical fiber composite overhead ground wire).

[0011]

[Table 1]

Further, since the always allowable temperature of the other line types is equal to or higher than the value in the above table, the color change temperature of the thermopaint 2 applicable to all the line types may be 60 ° C. even if the margin is considered. .
The color of the thermo paint 2 is preferably a visibility; a conspicuous color, for example, red. Once discolored, it is irreversible that does not return to its original state.

FIG. 2 shows the color change of the electric wire 1 coated with the thermopaint 2 under the above conditions. That is, FIG. 2A shows an electric wire with a heat detection type rotation detection mark at the time of overhead wire, that is, at room temperature. At this stage, if the thermopaint 2 changes spirally around the electric wire 1, It can be detected that the electric wire 1 is twisted, and the twist can be corrected.

FIG. 2B shows an electric wire with a heat-sensing type rotation detection mark at the time of power transmission after the overhead wire, that is, at the time of high temperature.
The thermopaint is discolored as indicated by reference numeral 2 '; it is faded, that is, the color is lost or almost inconspicuous, and the landscape is not impaired by the thermopaint 2'.

According to this embodiment, the predetermined rotation can be detected by detecting the twist of the electric wire up to the time of the overhead line by the rotation of the mark, but the mark is completely useless at a high temperature (at the time of power transmission after the overhead line). Since the color disappears or becomes inconspicuous, it is possible to provide an electric wire with an environment-friendly heat-sensing type rotation detection mark that does not harm the landscape and does not surprise the eyes of human beings.

In the above-described embodiment, the discoloration temperature of the thermo paint is set to 60 ° C., but is not limited to this.
It is also possible to apply a thermopaint set at another temperature. In addition to the thermo paint, it is also possible to apply a thermo tape or a thermo label.

[0017]

As described above, according to the present invention, the rotation detection mark provided on the surface of the electric wire is displayed until the wire is connected,
The intended problem of providing an electric wire with a heat-sensing type rotation detection mark, in which the rotation detection mark can disappear when the track is operated after the overhead line; the object can be achieved, and the effect can be said to be large.

[Brief description of the drawings]

FIG. 1 shows an embodiment of an electric wire with a heat-sensing rotation detection mark according to the present invention, wherein (a) is a cross-sectional explanatory view and (b) is a side view.

2 shows a state diagram of the electric wire with a heat-sensing type rotation detection mark shown in FIG. 1, (a) is a side view of a mark display state up to the time of the overhead line, and (b) is a disappearance of the mark during line operation after the overhead line. The side view of a state.

[Explanation of symbols]

 1 Electric wire 2 Rotation detection mark 2 'Rotation detection mark in colorless state

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 9/00 H02G 9/00 E // H01B 5/08 H01B 5/08 11/22 11/22 F-term (Reference) 2F056 VA02 VA10 5G307 EC07 EE01 EE02 EF10 5G315 HA01 JA02 JB01 JB05 JC01 JC02 5G319 HA08 HA10 HB02 HB03 5G369 AA16 AA17 BA01 BB04 EA01

Claims (4)

[Claims] 1. A belt-shaped mark for detecting torsional rotation of an electric wire in the longitudinal direction of the surface of an electric wire to be installed has a color at the time of the overhead wire, but senses heat generated by power transmission after the overhead wire. An electric wire with a heat-sensing rotation detection mark, characterized by using a heat-sensing type mark whose color disappears or becomes inconspicuous. 2. The heat-sensing type rotation detection mark-provided electric wire according to claim 1, wherein the heat-sensing type mark has a color that is conspicuous at room temperature, but is a thermopaint whose color disappears or becomes inconspicuous at high temperatures. 3. The heat-sensing type rotation detection mark-provided electric wire according to claim 1, wherein the color of the heat-sensing type mark disappears or becomes inconspicuous at 60 ° C. 4. The heat-sensitive mark according to claim 1, wherein said mark is irreversible which does not return after its color has disappeared or became inconspicuous at a certain temperature.
An electric wire with a heat detection type rotation detection mark according to the item.