JP2002117723A - High corrosion-resistant electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high corrosion-resistant electric wire retarding the corrosion of an electric wire in a corrosive environment of an industrial area, a seaside area, or the like, and increasing corrosion resistance than the conventional electric wire. SOLUTION: In an electric wire 10 manufactured by intertwining plural aluminum wires 2 serving as a conductor on steel wires 1 or a steel stranded wire, (1) the surfaces of the aluminum wires 2 and the steel wires 1 are coated with a corrosion resistant metal layer of either one of silver, gold, platinum, palladium, rhodium, and ruthenium, having a thickness of 5-100 μm, or (2) the surfaces of only the aluminum wires 2 are coated with the corrosion resistant metal layer of either one of silver, gold, platinum, palladium, and ruthenium, having a thickness of 5-100 μm, and an insulating layer 5 is formed between the metal layers and the steel wires 1, and the terminals of the electric wires of (1) and (2) are covered with resin 15 with high airtightness to completely cut off from ambient atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an overhead transmission line, etc.
The present invention relates to an electric wire in which an aluminum wire as a conductor is twisted around a steel wire as a tension member, and more particularly to a highly corrosion-resistant electric wire in which corrosion of a steel wire that bears tension is suppressed.

[0002]

2. Description of the Related Art Generally, aluminum-coated steel wires and zinc-coated steel wires having high strength in tension members are used as overhead transmission lines, overhead ground wires, distribution lines, and the like (hereinafter, collectively referred to as "steel wires"). Alternatively, an electric wire in which a plurality of aluminum conductor wires or aluminum alloy conductor wires (hereinafter, collectively referred to as “aluminum wire”) are used and twisted wires are used.

FIG. 3 is a schematic view of a conventional overhead transmission line, and FIG.
FIG.

As shown in FIGS. 3 and 4, a conventional overhead power transmission line 10 is configured by twisting a plurality of steel wires 1 and twisting a plurality of aluminum wires 2 around the steel wires.

[0005] The service life of the overhead transmission line 10 is defined by a mechanical residual strength value, and corrosion is one of the factors governing the mechanical residual strength value.

Conventionally, as a method for preventing this corrosion, a method of applying an anticorrosive containing a mineral oil as a main component to the electric wire 10 is known.

[0007]

However, the electric wire 1
Even if an anticorrosive is applied to an industrial area or a coastal area, the gas contained in the smoke (HC
1, Cl ₂ , SO _X , H ₂ S, etc.), sea salt particles (NaC
1) and the like, the electric wire 10 may be corroded. As a result, the mechanical properties of the electric wire 10 are remarkably deteriorated, and there is a problem that the life of the electric wire 10 must be shortened.

Accordingly, an object of the present invention is to provide a high corrosion resistance, which suppresses corrosion in a corrosive environment such as an industrial zone or a coastal area, and has improved corrosion resistance over conventional electric wires, based on the above-mentioned problems of the prior art. It is to provide an electric wire.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is directed to an electric wire in which a plurality of aluminum wires serving as conductors are stranded around a steel wire or a steel stranded wire as a tension member. And a metal coating layer having high corrosion resistance formed on the surface of the aluminum wire and the steel wire.

A second aspect of the present invention is an electric wire in which a plurality of aluminum wires serving as conductors are twisted around a steel wire or a steel stranded wire as a tension member, and a metal having high durability on the surface of the aluminum wire. A coating layer is formed, and an insulating layer is provided between the aluminum wire on which the metal coating layer is formed and the steel wire or the steel stranded wire.

According to a third aspect of the present invention, the metal coating layer has a corrosion-resistant metal layer made of any of silver, gold, platinum, palladium, rhodium and ruthenium on at least the outermost surface.

According to a fourth aspect of the present invention, the thickness of the corrosion-resistant metal layer of the metal coating layer is 5 μm or more and 100 μm or less.

According to a fifth aspect of the present invention, both ends are covered with a resin.

With the above arrangement, even when exposed to corrosive environment, the steel wire and the aluminum wire are strongly acidic atmosphere or Cl with a metal coating layer ^- is protected from significant corrosion is suppressed as compared with the conventional wire Will be.

Further, since both ends are covered with a resin having excellent airtightness, the surrounding portion is completely shielded from the surrounding environment at the clamp portion where the ends are connected to each other.

As a result, it is possible to suppress a decrease in strength of the electric wire due to corrosion, and it is possible to extend the life of the electric wire.

[0017]

Next, a preferred embodiment of the present invention will be described.

In general, when two different metals are in contact in a corrosive environment, the corrosion potential of the two metals is different, so that the corrosion of a metal having a lower potential (a metal having a high ionization tendency) is promoted. This phenomenon is called dissimilar metal contact corrosion.

In this case, it is known that the corrosion of a metal having a more noble potential (a metal having a low ionization tendency) is suppressed (this is referred to as cathodic protection). , P65.1995).

According to the present invention, similarly to the conventional overhead power transmission line, basically, a high strength aluminum-coated steel wire or a zinc-coated steel wire as a tension member (hereinafter, collectively referred to as "steel wire"). Or, around the steel stranded wire, aluminum conductor wire or aluminum alloy conductor wire (hereinafter, referred to as conductor)
Collectively, it is referred to as “aluminum wire”. ) Are twisted, but the corrosion resistance is improved by utilizing dissimilar metal contact corrosion.

That is, in the present invention, the surface of the aluminum wire and the steel wire is provided with a high corrosion resistance made of any of silver, gold, platinum, palladium, rhodium and ruthenium which are noble metals than aluminum and steel. Is formed.

Alternatively, a highly corrosion-resistant metal coating layer made of any of silver, gold, platinum, palladium, rhodium and ruthenium, which is a metal nobler than aluminum, is formed on the surface of the aluminum wire. In this case, there is a problem that the steel wire as a tension member causes contact corrosion with a noble metal (silver, gold, platinum, palladium, rhodium, ruthenium). Therefore, it is essential to provide an insulating layer between the aluminum wire coated with the corrosion resistant metal and the steel wire.

Further, if the end of the electric wire is placed in a corrosive environment, contact corrosion between the corrosion-resistant metal layer and the electric wire (element wire) by different kinds of metal occurs. As a result, corrosion of the electric wire (element wire) is accelerated as compared with the case where the electric wire (element wire) exists alone. Therefore, it is necessary to cover the end of the electric wire with a resin having excellent airtightness to completely shield the surrounding environment.

Further, the corrosion-resistant metal layer of the metal coating layer has a thickness of 5 μm.
It is formed with a thickness of not less than m and not more than 100 μm.

[0025] With this configuration, even when exposed to corrosive environment, the steel wire and the aluminum wire are strongly acidic atmosphere or Cl with a metal coating layer ^- protected from significantly corroded compared with the conventional wire inhibition Will be done. As a result, it is possible to suppress a decrease in strength of the electric wire due to corrosion, and it is possible to extend the life of the electric wire.

When the thickness of the corrosion-resistant metal layer on the surface of the aluminum or steel wire is less than 5 μm, the underlying aluminum and steel are easily exposed when handling electric wires and the like, and a sufficient effect of inhibiting corrosion cannot be obtained. Further, since the corrosion-resistant metal is expensive, if the coating thickness exceeds 100 μm, the product cost increases. Therefore, the appropriate coating thickness of the corrosion-resistant metal is 5 μm or more and 100 μm or less.

Further, in the present embodiment, the present invention is applied to an overhead power transmission line, but it is needless to say that the present invention is effective for improving the corrosion resistance even when applied to an overhead ground wire or a distribution line.

[0028]

Next, more specific embodiments will be described in detail with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a cross-sectional view of a highly corrosion-resistant electric wire of Embodiment 1.

As shown in FIG. 1, this high corrosion resistant electric wire is
A wire 10 in which a plurality of, for example, 26 aluminum wires 2 are twisted around a wire in which a plurality of, for example, seven steel wires 1 are twisted, and an aluminum wire on the surface of the aluminum wire 2 and the steel wire 1 2 and electrical contact is so directly coated metallized layer 20a having a corrosion-resistant metal layers 12 and 22 on the outermost surface, 20b are mainly composed of a further strong acid atmosphere and Cl ^- from the wire 10 As shown in FIG. 6, a resin 15 for closing the inside is provided at both ends 10e for shielding.

This high corrosion resistant electric wire has a number of strands of steel wire 1 / diameter of wire of 7 / φ3.5 mm, and a number of strands of aluminum wire 2 /
The wire diameter is 26 / 4.5 mm.

The metal coating layers 20a and 20b may be entirely formed of a corrosion-resistant metal made of any one of silver, gold, platinum, palladium, rhodium and ruthenium. The coating body 11, 21 on the steel wire 1 or aluminum wire 2 side to be coated, and any of silver, gold, platinum, palladium, rhodium, ruthenium formed on the outermost surface on the coating body 11, 21 And corrosion-resistant metal layers 12 and 22.

The corrosion-resistant metal layers 12 and 22 are
It is formed to a thickness of μm.

(Embodiment 2) FIG. 2 is a cross-sectional view of a highly corrosion-resistant electric wire of Embodiment 2.

As shown in FIG. 2, this high corrosion resistant electric wire is
An electric wire 10 in which a plurality of, for example, 26 aluminum wires 2 are twisted around a wire in which a plurality of, for example, seven steel wires 1 are twisted, and the aluminum wire 2 is electrically connected to the surface of the aluminum wire 2. Metal coating layer 20 which is directly coated so as to contact with
and b, are mainly composed resulting insulating layer 5 which is provided between these and the aluminum wire 2 and the steel wire 1, further strongly acidic atmosphere and Cl ^- in order to shield from the wire 10, shown in FIG. 6 As described above, the resin 5 for closing the inside is provided at both ends 10e.

This high corrosion resistant electric wire has a number of strands of steel wire 1 / diameter of wire of 7 / φ3.5 mm and a number of strands of aluminum wire 2 /
The wire diameter is 26 / 4.5 mm.

The metal coating layer 20b is entirely silver,
It may be made of a corrosion-resistant metal made of any one of gold, platinum, palladium, rhodium, and ruthenium. However, from the viewpoint of cost, as shown in FIG. A corrosion-resistant metal layer 22 formed of any of silver, gold, platinum, palladium, rhodium, and ruthenium formed on the outermost surface of the main body 21.

The corrosion-resistant metal layer 22 is formed to a thickness of 20 μm.

For the insulating layer 5, a commercially available ceramic coating agent is used.

Next, the corrosion resistance of the present invention will be described.

The evaluation of the corrosion resistance was carried out first in Example 1 described above.
And in Example 2, the type of the coating metal was changed and each was manufactured to have a length of 500 mm. Using these electric wires and a conventional electric wire whose both ends were covered with epoxy resin as a comparative example, the aqueous solution of hydrogen chloride was used at room temperature. (PH = 0.1) for 100 hours, and the degree of corrosion of the aluminum wire and the steel wire after the immersion was evaluated.

The evaluation method was as follows: 腐 食 when there was no corrosion or the degree of corrosion was extremely small, Δ when the corrosion was scattered, and × when the degree of corrosion was extremely large.

Table 1 shows the results of these evaluations.

[0044]

[Table 1]

As shown in Table 1, the electric wires of Examples 1 and 2 did not corrode with both the aluminum wire and the steel wire, whereas the electric wire of Comparative Example both showed corrosion. In particular, the corrosion of the aluminum wire was remarkable.

From the above, it was confirmed that the corrosion of the steel wire and the aluminum wire was suppressed by the metal coating layer.

Further, the effect of suppressing corrosion by the resin at both ends was examined.

In this experiment, first, the resin-coated and non-resin-coated ones at both ends in Examples 1 and 2 described above were manufactured with a length of 500 mm.
These were added to aqueous hydrogen chloride (pH = 0.1) at room temperature for 10 minutes.
It was immersed for 0 hours, and the corrosion degree of the aluminum wire and the steel wire after immersion was evaluated.

The evaluation method was as follows: な し when no corrosion was observed or the degree of corrosion was extremely slight, Δ when the corrosion was scattered, and × when the degree of corrosion was extremely large.

Table 2 shows the evaluation results.

[0051]

[Table 2]

As shown in Table 2, it was recognized that the degree of corrosion of the aluminum wire and the steel wire in the untreated terminal wire was extremely large. From this, it can be said that in the present invention, terminal treatment is indispensable in order to prevent corrosion at both ends.

As described above, as shown in Examples 1 and 2, silver, gold, platinum,
Forming a metal coating layer made of any of palladium, rhodium and ruthenium to a thickness of 5 μm or more and 100 μm or less, and a metal coating layer made of any of silver, gold, platinum, palladium, rhodium and ruthenium on the surface of the aluminum wire Was formed to a thickness of 5 μm or more and 100 μm or less, and an insulating layer was provided between these and a steel wire, which proved to be superior in corrosion resistance to a conventional electric wire.

[0054]

In summary, according to the present invention, even if the electric wire is exposed to a corrosive environment, the steel wire and the aluminum wire are made to have a strong acid atmosphere or C
l ^- are protected from, it is possible to significantly reduce the corrosion of the wire.

Further, since both ends are covered with a resin having excellent airtightness, the surrounding portion is completely shielded from the surrounding environment at the clamp portion where the ends are connected to each other.

As a result, it is possible to suppress a decrease in mechanical properties due to corrosion of the electric wire, and it is possible to extend the life of the electric wire and reduce the cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a highly corrosion-resistant electric wire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a highly corrosion-resistant electric wire showing another embodiment of the present invention.

FIG. 3 is a schematic view of a conventional overhead transmission line.

FIG. 4 is a cross-sectional view of the overhead transmission line of FIG.

FIG. 5 is an enlarged view of a metal coating layer of the highly corrosion resistant electric wire of FIG.

FIG. 6 is a schematic view of an end of the highly corrosion-resistant electric wire of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 steel wire (tension member) 2 aluminum wire (conductor wire) 5 insulating layer 10 electric wire 12, 22 corrosion-resistant metal layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Watanabe 5-1-1, Hidakacho, Hitachi City, Ibaraki Prefecture Within Hitachi Cable Research Institute, Ltd. (72) Inventor Koji Nagano 5 Hidakacho, Hitachi City, Ibaraki Prefecture 1-1, Hitachi Cable Co., Ltd. (72) Inventor Masanori Isozaki 4-1 Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Tokyo Electric Power Co., Inc. (72) Inventor Yoshiyuki Yasutomi Nagoya, Aichi 2-4-1 Rokuno, Atsuta-ku, Tokyo F-term in the Fine Ceramics Center (Reference) 4K044 AA02 AA06 AB04 BA08 BB01 BC02 5G307 EA01 EB03 EC06 ED07 EE01 EF02

Claims (5)

[Claims] 1. An electric wire in which a plurality of aluminum wires serving as conductors are twisted around a steel wire or a steel stranded wire as a tension member, wherein a metal coating layer having high corrosion resistance on the surface of the aluminum wire and the steel wire. A highly corrosion-resistant electric wire, characterized by having formed thereon. 2. An electric wire in which a plurality of aluminum wires serving as conductors are twisted around a steel wire or a twisted steel wire as a tension member, a metal coating layer having high durability is formed on the surface of the aluminum wire. A high corrosion-resistant electric wire, further comprising an insulating layer provided between the aluminum wire on which the metal coating layer is formed and the steel wire or the steel stranded wire. 3. The highly corrosion-resistant electric wire according to claim 1, wherein the metal coating layer has a corrosion-resistant metal layer made of any one of silver, gold, platinum, palladium, rhodium, and ruthenium on at least the outermost surface. 4. The highly corrosion-resistant electric wire according to claim 1, wherein the thickness of the corrosion-resistant metal layer of the metal coating layer is 5 μm or more and 100 μm or less. 5. The highly corrosion-resistant electric wire according to claim 1, wherein both ends are covered with a resin.