JPS5920919A - Method of producing slack suppression wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for efficiently and easily manipulating a slack-reduced electric wire.

As shown in Fig. 1, a small gap 6 is provided between the steel core 1 and the aluminum strand layer 2 in the steel core aluminum stranded wire, and when the steel core aluminum strand is wired, the tension of the wire is reduced by linear expansion. A sag-suppressing electric wire 10 is known in which the load is assigned only to the steel core 1 with a small coefficient, thereby suppressing a decrease in sag caused by a temperature rise during energization, and increasing the current capacity accordingly.

However, when looking at the problem of how to manufacture such a slack-reduced electric wire 10, there are various ways to solve this problem.

The inventors initially discovered that in order to construct a sag-reducing electric wire, it would be ineffective if inclusions remained between the steel core 1 and the aluminum stranded wire layer 2, as shown in FIG. I thought it had to be a complete gap state. However, as a result of various subsequent tests, as long as there is a separation W between the steel core 1 and the aluminum stranded wire layer 2, the sag can be sufficiently suppressed even if there are relatively soft inclusions between them. We have found that it can have a beneficial effect. This is because, in the case of overhead power transmission lines, a large amount of tension is applied to the overhead wires, so sliding occurs between the steel core and the aluminum stranded wire layer through inclusions, causing stress relaxation in the aluminum stranded wire layer. It is thought that this is because of this.

The present invention is based on this knowledge.

In this case, the relatively soft inclusions still exhibit an inclusion effect under a load similar to the strand tension when twisting aluminum wires onto a steel core in a normal wire twisting process, and after twisting, these inclusions This refers to the degree of softness that allows the steel core and aluminum strands to be separated by a small distance due to the presence of objects. An example of such an inclusion is a string-like body or a band-like body made of natural fibers or artificial fibers such as soft plastics.

Fig. 2 shows a state in which such a string-like inclusion 4 is wound around a steel core 1, and an aluminum stranded wire layer 2 is twisted on top of it to form a small gap 6. FIG.

In this state alone, the relatively soft inclusions 4 absorb moisture and significantly impede corrosion resistance. In the present invention, an essential component is to add an anticorrosive agent to the inclusions 4 to completely eliminate the damage caused by them.

The anticorrosive agent may be added by impregnation or coating. Specific examples of anti-corrosion agents include Polybis 30SH 62% by weight according to Dainichiseika Co., Ltd.'s specifications, and carbonized carbon 100 33 weight quantum hardening boiling oil 5 quantum molecules, which are both affordable and highly effective. .

Furthermore, the present invention is also applicable to those using a water-soluble substance (for example, trade name Poval) as an inclusion. In other words, inclusions of water-soluble substances are eluted after twisting the aluminum stranded wire layer, and then try to form a small gap 6 as shown in Figure 1, but this is not completely eluted. There is little to do, and an elution residue is generated. Since it is water-soluble, it contains water, which is extremely harmful in terms of corrosion resistance. However, in the present invention, since an anticorrosive agent is added to this water-soluble substance, such adverse effects are completely eliminated.

One typical embodiment of the inclusion is to add a hardening substance to the grease, allow it to harden to some extent, and form this into a string or band shape, which is then wound or longitudinally attached. Since the base material is grease, the lubrication effect is excellent, and it can be expected to be an extremely excellent sag-reducing electric wire.

As described above, according to the present invention, sagging can be suppressed by simply winding or longitudinally attaching an intervening layer in the wire twisting process, and subsequent troublesome procedures can be completely eliminated. Its significance is enormous.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the sag-reducing electric wire, and FIG. 2 is a partially cut-off perspective view showing inclusions. 1: Steel core, 2 aluminum stranded wire layers, 6: Small gap, 4: Inclusions. Kou 1 country

Claims (1)

[Claims] 1. An intervening layer made of a relatively soft material having anticorrosive properties is provided around the outer periphery of the steel core, and an aluminum stranded wire layer is placed on top of the intervening layer, with a small distance between the steel core and the aluminum stranded wire layer. A method for manufacturing a slack-reducing electric wire by twisting it together so as to tighten it. 2. The manufacturing method according to claim 1, wherein the inclusion is a water-soluble substance added with an anticorrosive agent. 3. The manufacturing method according to claim 1, wherein the inclusions are hardened grease-like substances. 4. The manufacturing method according to claim 1, wherein the inclusion is a string-like or band-like material mainly composed of fibers to which an anticorrosive agent is added.