JP2001089783A - Arial power cable using rust proof grease - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aerial power cable using a rust proof grease useful in using under the effect of a salt damage environment, air pollution, acid rain, etc. SOLUTION: This aerial power cable excellent in weather resistance and acid resistance is provided by using the rust proof grease consisting of 100 pts.wt. based oil and 10-500 pt.wt. adding amount thickening agent having a calcium salt structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead power transmission line using rust-preventive grease which is useful in a salt damage environment, air pollution, acid rain and the like.

[0002]

2. Description of the Related Art Overhead transmission lines installed between towers are required to be lightweight in order to reduce the costs of the towers and other equipment. From this viewpoint, as the conductor, an overhead transmission line using an aluminum wire or an alloy wire thereof that is lightweight and has relatively high conductivity among the conductors has been proposed.

[0003] On the other hand, overhead transmission lines installed between towers are:
Due to its own weight, it deflects between the towers and hangs at its center, but at that time, from the viewpoint of ensuring safety, the height of the highest hang (the lowest point) from the ground is determined according to the transmission voltage. Is required. However, increasing the height of a supporting point such as a tower increases the cost of the tower and other equipment.

Therefore, conventionally, a method has been adopted in which the tension applied to the overhead power transmission line between the towers is increased to reduce the slack amount (sag). For example, in order to increase the tension of the transmission line, a single wire or stranded wire made of galvanized steel wire or aluminum-coated steel wire is used as the center wire material, and while the strength is secured at the steel wire portion, a plurality of aluminum wires are surrounded around the wire. Or a composite stranded wire (ACSR = Aluminum Con) in which the desired conductivity is ensured by twisting the alloy wires concentrically.
An overhead transmission line consisting of ductor steel reinforced) has already been proposed.

[0005] In the case of such an ACSR type overhead power transmission line, even if it is exposed to a natural environment such as strong sunshine, wind, snow and rain, the center wire portion is made of a galvanized steel wire or an aluminum-coated steel wire whose corrosion protection is performed. In addition, since the wire twisted around the center wire is also a highly corrosion-resistant aluminum wire or its alloy wire, it exhibits sufficient corrosion resistance under a normal environment.

However, even in an ACSR type overhead transmission line having such a structure having excellent corrosion resistance, ions such as chloride ions are generated in a salt damage environment affected by the ocean, that is, due to marine NaCl and the like. In an existing environment, the interaction between the ions and water (moisture) or the like causes a problem that the corrosion resistance of the aluminum wire or its alloy wire is significantly reduced, and the life of the transmission line itself is reduced.

[0007] For this reason, even in the case of an overhead transmission line used in a salt-damage environment, the corrosion resistance is improved by covering the metal part with rust-preventive grease.

[0008]

However, in recent years,
In areas other than those affected by the ocean due to the effects of air pollution and acid rain, the corrosiveness of aluminum wires and their alloy wires is increasing, and overhead transmission lines used in such environments Also, deterioration due to corrosion has become a problem.

On the other hand, there is a concern that rust-preventive grease used in overhead transmission lines may deteriorate with time due to the effects of air pollution and acid rain as well as in the above-mentioned salt damage environment. Was.

That is, a general rust preventive grease is composed of a base oil composed of mineral oil, synthetic hydrocarbon, silicon oil and the like, and a thickener such as sodium soap, lithium-based material, aluminum-based material, organic bentonite, organic urea and the like. As the main component,
In addition, it consists of additives such as deterioration inhibitors and structural stabilizers, and by adjusting the blending of these components,
Despite obtaining the desired properties, when placed under the influence of salt damage environment, air pollution, acid rain, etc. as described above, deterioration due to its high acidity progresses, and initial rust prevention performance can be achieved. There was concern that it would go away.

[0011] The present invention has been made in view of such a situation, and can be favorably performed not only in a salt damage environment affected by the ocean, but also in an area under the influence of air pollution and acid rain. The aim is to provide an overhead power transmission line using rust-preventive grease.

[0012]

According to the present invention, there is provided a rust-preventive grease comprising 100 parts by weight of a base oil, a thickening agent having a calcium salt structure and an addition amount of 10 to 500 parts by weight. It is in the overhead transmission line used.

According to a second aspect of the present invention, there is provided the overhead transmission line using rust-preventive grease according to the first aspect, wherein the substance having a calcium salt structure is calcium carbonate or a calcium salt of an organic acid. .

According to a third aspect of the present invention, the rust-preventive grease is applied to a composite stranded conductor portion in which a plurality of aluminum wires or alloy wires thereof are twisted around a center wire made of a single wire or a stranded wire. An overhead transmission line using the rust-preventive grease according to claim 1 or 2.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The base oil of a rust-preventive grease used in the present invention comprises mineral oil, synthetic hydrocarbon, silicon oil, etc., as in the prior art, to which a thickener made of a substance having a calcium salt structure is added. It is. In the conventional grease, as described above, sodium soap, lithium-based material,
A thickener such as an aluminum-based material, organic bentonite, or organic urea is added.

Examples of the substance having a calcium salt structure of the present invention include calcium carbonate and calcium salts of organic acids having a high molecular weight, for example, a chemical formula [(R-benzene nucleus-SO ₃ ) ₂
Ca ++ xCaCO ₃ , where R is carbon number C = 1-10
0 and x are represented by a maximum of 100], and further, those represented by a chemical formula [(R—SO ₃ ) ₂ Ca ++ xCaCO ₃ , where R is a carbon number C = 1 to 100, and x is a maximum of 100]. No.

When a thickener comprising a substance having a calcium salt structure is added, as described later, weather resistance and acid resistance are improved, and a great effect is exerted particularly when used outdoors under a highly acidic atmosphere. It turns out. The reason is that
It is assumed that the calcium salt structure is caused by a combination of a weak acid and a strong alkali. In other words, it is considered that this calcium salt reacts with the strong acid to form a strong acid-strong alkali weak salt that is harmless to grease itself and aluminum metal. In particular, it is considered that if this weak salt is carbonic acid, it is released into the air as carbon dioxide after drying, and therefore, it is completely harmless to grease itself and aluminum metal.

The addition amount of the thickener exhibiting such an effect is set to 10 to 500 parts by weight with respect to 100 parts by weight of the base oil. If the amount is less than 10 parts by weight, sufficient weather resistance and acid resistance are obtained. If no improvement is observed, and if the amount exceeds 500 parts by weight, the consistency is significantly increased and peels off from the aluminum metal, which is not preferable.

Further, in the case of the present invention, Mg is used as the acid-resistant agent.
(OH) ₂ , Ca (OH) ₂ , NaOH, Al (O
H) ₃ , hydrotalcite and the like may be used in combination. Needless to say, as in the conventional case, other additives such as a deterioration inhibitor and a structure stabilizer can be added as needed.

In the overhead transmission line according to the present invention, the rust-preventive grease having such a structure is applied around a metal portion, for example, in the case of the above-mentioned ACSR type overhead transmission line, around a center wire made of a single wire or a stranded wire. It is obtained by applying a plurality of aluminum wires or alloy wires thereof to a composite stranded wire conductor portion obtained by twisting.

[0021] In this overhead transmission line, even if used in an atmosphere of a strong acid caused by acid rain or the like, the thickening agent in the grease is removed before the strong acid reaches the surface of the aluminum wire or its alloy wire. The acid is detoxified by the above reaction, so that a significant improvement in acid resistance can be obtained as compared with conventional grease.

<Examples> Next, Table 1 shows that rust-preventive greases (Examples 1 to 7) having various compounding examples used for the overhead power transmission line of the present invention were manufactured, and each characteristic [weather resistance (UV) discoloration),
Acid resistance, mechanical properties (brittleness)]. The results are also shown in the table.

Comparative Example For comparison, Table 2 shows that
Rust-preventive greases (Comparative Examples 1 to 8) consisting of various formulation examples lacking the conditions of the present invention were also produced, and these also had various properties (weather resistance (UV discoloration), acid resistance, mechanical properties (brittleness)). ]
A characteristic test was performed on the sample. The results are shown in the same table.

The above-mentioned weather resistance (UV discoloration) has a thickness of 1
rust-preventive grease is applied to one side of an aluminum flat plate having a thickness of 10 mm.
Irradiation was carried out for 0 hour, and those without discoloration were indicated by ○, and those with discoloration were indicated by x.

The acid resistance is determined by applying each of the above rust-preventive greases to an aluminum plate and immersing the same in 1M (mol) hydrochloric acid.
The aluminum plate is allowed to stand for a period of time, and the aluminum plate whose weight loss is 0.1% or less is indicated by ◎. Those having 0% or less were indicated by x.

The above mechanical properties (brittleness) are indicated by Δ when the produced grease has a consistency of 50% or more as compared with the original grease, that is, the property of retaining the base oil by the thickener is reduced. Those with less than 50% were indicated by ○.

[0027]

[Table 1]

[0028]

[Table 2]

First, Table 1 shows that the rust-preventive grease used in the overhead transmission line of the present invention (Examples 1 to 7) shows good characteristics, whereas Table 2 shows that the condition of the present invention is good. It can be seen that any of the properties of the rust-preventive grease lacking (Comparative Examples 1 to 8) is insufficient. Also, from this,
It is easily presumed that the overhead transmission line of the present invention can provide an electric wire exhibiting good characteristics.

[0030]

As is clear from the above description, in the overhead transmission line using the rustproof grease according to the present invention, the base oil 10
Since 0 parts by weight, the thickener is a substance having a calcium salt structure, and the addition amount is 10 to 500 parts by weight, rust-preventive grease is used, so that an electric wire excellent in weather resistance and acid resistance can be obtained. In particular, calcium carbonate,
A calcium salt of an organic acid may be used, and rust-preventive grease may be applied to a composite stranded conductor in which a plurality of aluminum wires or alloy wires thereof are twisted around a center wire made of a single wire or a stranded wire of an overhead power transmission line. It is good to apply.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10N 30:12 C10N 30:12 (72) Inventor Shinji Katayama 1-5-1, Kiba, Koto-ku, Tokyo Stock Inside Fujikura (72) Inventor Shoji Amimura 1-5-1, Kiba, Koto-ku, Tokyo F-term inside Fujikura Co., Ltd. 4H104 AA13B BG06B CJ02A DA02A EB02 FA02 LA06 PA11 QA18 5G327 EA08

Claims (3)

[Claims] 1. An overhead transmission line using rust-preventive grease in which 100 parts by weight of a base oil and a thickener are substances having a calcium salt structure, and the added amount is 10 to 500 parts by weight. 2. The overhead transmission line using rustproof grease according to claim 1, wherein the substance having a calcium salt structure is calcium carbonate or a calcium salt of an organic acid. 3. The rust-preventive grease is applied to a composite stranded wire conductor in which a plurality of aluminum wires or alloy wires thereof are twisted around a center wire made of a single wire or a stranded wire. Or an overhead transmission line using the rustproof grease according to 2.