JP2002020777A - Grease and aerial power transmission line obtained by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grease capable of exhibiting stable characteristics even in the use in a high-temperature surrounding. SOLUTION: This grease is obtained by adding 5-100 pts.wt. material for preventing dripping down, comprising a powder to 100 pts.wt. main component part of the grease, comprising a base oil and a thickening agent. As a result, the dripping down and the evaporation of the grease can favorably be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease exhibiting stable characteristics even when used in a high-temperature environment, and to an improvement of an overhead power transmission line using the same, and more particularly to a method for preventing dripping and volatilization of grease.

[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 has a shape that hangs down at its center. At that time, from the viewpoint of ensuring safety, the height of the most sagging part (the lowest point) from the ground according to the transmission voltage is a predetermined height. It is required to be at least height. 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 a stranded wire made of a galvanized steel wire or an aluminum-coated steel wire is used as a center wire material, and while securing strength at the steel wire portion, a plurality of aluminum wires or A composite stranded wire (ACSR = Aluminum Condus) in which the alloy wires are twisted concentrically to ensure the desired conductivity
An overhead transmission line consisting of ctor 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. Due to such corrosion resistance, aluminum wires and their alloy wires are often used without special anticorrosion treatment on the surface.

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.

For this reason, 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 grease for preventing corrosion.

[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.

[0009] Further, even in the case of grease for rust prevention used in overhead power transmission lines, it is thought that it depends on the characteristics (physical properties) of the base oil (base oil) serving as a base, but the grease drips or volatilizes over time. There was a problem. In particular, when a high voltage is applied to the wire and the temperature of the wire is high, or when the wire is at a high temperature in summer or the like, these phenomena are conspicuously exhibited, and there is a problem that the rust prevention effect inherent in grease cannot be obtained.

That is, ordinary grease is a base oil (base oil) made of mineral oil, synthetic hydrocarbon, silicon oil, or the like.
And a thickener such as sodium soap, lithium-based material, aluminum-based material, organic bentonite, organic urea as a main component, and other additives such as an anti-deterioration agent and a structural stabilizer. Although the desired properties are obtained by adjusting the composition of each component, generally, in the base oil material, the molecular weight of the base oil material varies, so that the low molecular weight oil drips over time due to its fluidity. There was a problem.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a grease for rust prevention and an overhead power transmission line which can respond well to use in a high temperature environment.

[0012]

The invention according to claim 1 of the present invention is characterized in that 5 to 100 parts by weight of a powder sag preventing material is added to 100 parts by weight of a grease main component. In grease.

According to a second aspect of the present invention, in the grease according to the first aspect, the sag preventing material is talc, clay, calcium carbonate, magnesium carbonate, or metal hydrate. is there.

According to a third aspect of the present invention, there is provided an overhead power transmission line characterized in that the grease according to the first or second aspect is applied around a center wire made of a single wire or a stranded wire.

According to a fourth aspect of the present invention, there is provided 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.
An overhead transmission line, wherein the grease according to claim 1 or 2 is applied.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The grease of the present invention has the same main components as those of the prior art, and includes a base oil (base oil) composed of mineral oil, synthetic hydrocarbon, silicon oil, etc., and a sodium soap added thereto. And a thickening agent such as a lithium-based material, an aluminum-based material, organic bentonite, and organic urea, and a dripping preventing material made of powder is added to the main component.

As the sagging prevention material, talc,
Clay, calcium carbonate, magnesium carbonate, or metal hydrates and the like, which may be used alone,
It is also possible to use a plurality of them together.

When these anti-sagging materials are added,
As described below, it was found that the dripping of the grease was improved and the volatility of the grease was also suppressed. The reason for this is that the anti-sag material is mixed into the base oil (base oil) in the grease, and the powder mixed in between the low molecular weight oils in particular is a kind of anti-slip agent and has a low molecular weight oil content. It is presumed that this exhibits a function as a binder, and that the oil attached to the surface of the added powder increases the holding power of the low molecular weight oil relatively. This anti-sagging material may be added simultaneously with the thickener at the time of grease production, but may also be added to the grease after production as appropriate.

The addition amount of the sag preventing material exhibiting such an action is set to 5 to 100 parts by weight based on 100 parts by weight of the main component of the grease.
Sufficient holding power for low molecular weight oil cannot be obtained.
When the amount exceeds 00 parts by weight, the function as an anti-slip agent or the function as a binder as described above becomes too large, and the consistency of the entire grease is greatly changed. This is because sometimes it becomes difficult to fill the grease, and the grease may come off after the installation.

In the case of the present invention, other additives, such as a deterioration inhibitor and a structure stabilizer, can be added as needed, as in the prior art.

On the other hand, the overhead transmission line according to the present invention may be appropriately applied with the grease having the above-described configuration in a form in which the grease is sufficiently filled around the center wire made of a single wire or a stranded wire. Although the structure of the electric wire is not particularly limited, a composite stranded wire conductor in which another wire is twisted around the outer periphery of the center wire is particularly preferable because an appropriate gap is generated between the wires. This is because grease is filled and held in the gap. From the above, in the above-mentioned ACSR type overhead transmission line, there is a composite stranded wire conductor in which a plurality of aluminum wires or alloy wires thereof are twisted around a center wire composed of a single wire or a stranded wire. By applying and filling grease to
Excellent overhead transmission lines can be obtained.

In the overhead transmission line of the present invention thus obtained, dripping caused by low molecular weight oil in the grease portion can be effectively prevented not only under a normal temperature environment but also under a high temperature environment. In addition to being prevented, even if it is volatile, it is effectively suppressed, so that the coated state by grease application is stably maintained for a long time. This allows
In particular, in the case of an overhead transmission line having a composite stranded conductor such as an ACSR type, it can cope with an area affected by the sea due to a salt environment or an area affected by air pollution, acid rain, etc. Even if the temperature rises, a stable grease coating state can be obtained, and a good installation state can be maintained.

[Examples] Next, greases satisfying the conditions of the present invention consisting of various formulation examples shown in Table 1 (Examples 1 to 3)
6) and manufacture each property [dripping resistance, consistency change, JC
S standard characteristics]. The results are shown in the same table.

[Comparative Examples] For comparison, rust-preventive greases (Comparative Examples 1 to 5) which lack the conditions of the present invention and consist of various formulation examples shown in Table 2 were also produced. Each property test was carried out for [dripping resistance, change in consistency, and standard properties of JCS]. The results are also shown in the table.

The dripping resistance is determined by applying the above grease (Examples 1 to 6 and Comparative Examples 1 to 5) to an aluminum plate, standing upright, and placing the grease in a thermostat at 100 ° C.
It was left for a day, then taken out, and its weight change was measured. If the change in weight due to the dripping of the grease is 1% or less, it is indicated by ○ (good).
The following are indicated by △ (good).

The above-mentioned change in consistency is measured by measuring the consistency (consistency) of the produced grease, and the change in the consistency is indicated by ○ (good) when the change in the consistency is 5% or less, and the change in the consistency is indicated by △ when the change is greater than 5% to 10% or less.
(Good).

The above-mentioned JCS standard characteristics are based on JCS (Japan Cable Manufacturers Association Standard) No. 399, and characteristic tests (chemical properties, heat resistance, cold resistance) are performed on bare wires of overhead power transmission lines. The test was performed, and those satisfying the predetermined criteria were indicated as passed.

[0028]

[Table 1]

[0029]

[Table 2]

First, from Table 1, the greases according to the present invention (Examples 1 to 6) all show good characteristics.
Even when used in a high-temperature environment, there is almost no change in the characteristics, but from Table 2, the anti-rust grease lacking the conditions of the present invention (Comparative Examples 1 to 5) has poor dripping resistance or It can be seen that there is a problem that the characteristics change greatly in a high temperature environment due to a change in the consistency or the like.

[0031]

As is apparent from the above description, in the grease for rust prevention according to the present invention, since a dripping prevention material made of a powder is added to the main component of the grease, it can be used in a high temperature environment. Also in use, dripping of the grease can be effectively prevented, and volatilization can also be effectively suppressed. That is, the grease coating function can be stably maintained over a long period of time, not limited to the electric wire.

In the overhead transmission line according to the present invention, the grease is filled around the center wire made of a single wire or a stranded wire, so that dripping and volatilization of the grease are effectively suppressed. An excellent electric wire that can maintain a stable function for a long time can be obtained. In particular, a composite stranded conductor type (ACSR) in which another wire is twisted around the center wire, or a composite stranded conductor type (ACSR) in which a plurality of aluminum wires or alloy wires thereof are similarly twisted around the center wire. In such a case, since there is an appropriate gap between the wires, the filling and holding of the grease is performed even more favorably, and a stable grease covering state is obtained even when a high voltage is applied and the wire becomes high temperature, and a better The laying condition of the wires is preserved.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 117/02 C10M 117/02 125/00 125/00 125/10 125/10 125/30 125/30 H01B 5/08 H01B 5/08 // C10N 10:02 C10N 10:02 10:04 10:04 10:06 10:06 30:00 30:00 Z 30:08 30:08 30:12 30:12 40: 14 40:14 40:32 40:32 50:10 50:10 (72) Inventor Shoji Amimura 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Shinji Katayama Koto, Tokyo 1-5-1, Kiba, Ward F-term in Fujikura Co., Ltd. F-term (reference) 4H104 AA11C AA13C AA24B AA24C BB17B BE13B DA02A EB02 FA01 FA02 FA03 LA04 LA06 LA20 PA11 QA18 5G307 EC02 EC07 EE01 EF02

Claims (4)

[Claims] 1. A grease characterized in that 5 to 100 parts by weight of a dripping preventing material made of a powder is added to 100 parts by weight of the main component of the grease. 2. The grease according to claim 1, wherein the sagging prevention material is talc, clay, calcium carbonate, magnesium carbonate, or metal hydrate. 3. An overhead transmission line, characterized in that the grease according to claim 1 or 2 is applied around a center wire made of a single wire or a stranded wire. 4. The grease according to claim 1 or 2, wherein a composite stranded conductor portion obtained by twisting a plurality of aluminum wires or an alloy wire thereof around a center wire made of a single wire or a stranded wire is provided with the grease according to claim 1 or 2. And overhead transmission lines.