JP2001006438A - Aluminum wire or aluminium alloy wire and power feeder wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve corrosion resistance by covering a surface with grease containing piperidine whose content in the grease has specified wt.%. SOLUTION: The content of piperidiue in grease is 5-15 wt.%. Since mixing of 15 wt.% of piperidine can be made when piperidine is preliminarily mixed with the grease whose viscousity is high, the viscousity of grease mixed is made 0.5×10 Pa.s to 5.0×10 Pa.s. In another power feeder aluminium wire or aluminium alloy wire, a surface thereof is covered with grease containing thiourea as a corrosion resistance material in stead of piperidine, and it is preferable that the content of thiourea in grease is 5-15 wt.% or the viscousity of grease containing thiourea is 190-250.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum wire or an aluminum alloy wire used as a conductor of a transmission line installed between steel towers or the like, and more particularly to an aluminum wire or an aluminum alloy wire for a transmission line having excellent corrosion resistance. About.

[0002]

2. Description of the Related Art Overhead transmission lines installed between towers are required to be lightweight in order to reduce the construction costs of towers and other equipment. Therefore, as the conductor of the overhead transmission line, aluminum or an aluminum alloy which is lightweight and has relatively high conductivity among the conductors is often selected.

[0003] An overhead power transmission line installed between towers is
Due to its own weight, it loosens between the towers and hangs at the center between the towers, but in order to ensure safety, the height of the hanging part from the ground is specified according to the transmission voltage to the transmission line. Must be set higher than the height.

However, if the height of a supporting point such as a tower is further increased, the construction cost of the tower and other facilities will increase. Therefore, conventionally, a method of increasing the tension applied to the transmission line between the towers to reduce the amount of slack (sag) has been used. In this case, in order to increase the strength against the tension of the power transmission line, it is formed by twisting aluminum or aluminum alloy around concentric circles around a single wire or stranded wire of galvanized steel wire or aluminum covered steel wire. Composite conductor (ACSR; Aluminum Conductor Steel Rein)
forced) is used as a transmission line.

Incidentally, such overhead power transmission lines are themselves required to be excellent in environmental resistance because they are exposed to natural environments such as sunlight, wind, rain and snow. Therefore, the surface of the steel wire used for steel core aluminum stranded wire such as ACSR is subjected to anticorrosion treatment by zinc plating, aluminum coating, or the like. On the other hand, since aluminum wires and aluminum alloy wires have good corrosion resistance to normal environments, special anticorrosion treatment is applied to the surfaces of aluminum wires and aluminum alloy wires installed under normal environments. It has not been.

[0006] However, it is known that the corrosion resistance of aluminum materials and aluminum alloy materials is significantly reduced by the presence of chloride ions. Therefore, in an area near the ocean, since a large amount of NaCl in seawater is present in the atmosphere, the overhead transmission line is exposed to an environment where chloride ions and moisture are present, and the life of the transmission line is reduced due to corrosion. Is significantly reduced. Therefore, especially for overhead transmission lines used in environments that are highly corrosive due to the effects of the ocean, etc., anticorrosion overhead transmission lines that cover the metal part with grease to shield from highly corrosive environments are used. Have been.

[0007]

However, due to recent effects of air pollution, acid rain, etc., the corrosiveness of aluminum materials is high even in areas other than the areas affected by the ocean. However, there is a problem that when the overhead power transmission line is exposed to the air, deterioration due to corrosion increases.

[0008] Even in such a severe environment, the anticorrosion treatment using grease is effective, but the grease coated on the metal part of the overhead power transmission line has a problem that it is deteriorated by the environment. . That is, since the grease is composed of a polymer compound, the grease is easily deteriorated by being irradiated with ultraviolet rays or heated by sunlight. Therefore, it is necessary to periodically monitor the anticorrosion overhead transmission line that has been subjected to anticorrosion treatment with grease depending on the installed environment, and to perform maintenance and inspection such as replenishment of grease.

[0009] Nevertheless, in particular, aluminum wires and aluminum alloy wires used for conductors rapidly corrode under such severe corrosive environment, so that complete maintenance may not be possible.

The present invention has been made in order to solve the above-mentioned problems, and provides an aluminum wire or aluminum alloy wire for a transmission line, which can further improve corrosion resistance, and a transmission line using the same. The purpose is to:

[0011]

In order to achieve the above object, an aluminum wire or aluminum alloy wire for a power transmission line according to the present invention is provided with grease containing piperidine on the surface thereof. The piperidine content is 5 to 15% by weight, or the grease has a viscosity of 0.5 × 10 ⁴ Pa · s to 5.0 × 1.
0 ⁴ Pa · s.

As a result of extensive studies by the inventors of the present invention to solve the above problems, the present inventors have found that a substance having a corrosion inhibiting effect on an aluminum material or an aluminum alloy material (hereinafter referred to as a corrosion inhibiting substance) is contained. It has been found that by applying grease to the surface of an aluminum wire or aluminum alloy wire, the progress of corrosion of the aluminum wire or aluminum alloy wire can be suppressed.

When such grease is applied to the surface of an aluminum wire or an aluminum alloy wire, the shielding effect of the grease portion other than the corrosion inhibitor is deteriorated by the environment, and the surface of the aluminum wire or the aluminum alloy wire is severely corroded. Even when exposed to the environment, the corrosion inhibitor forms a coating on the surface of the aluminum wire or aluminum alloy wire, so that the exposed surface can be prevented from corroding. The present invention uses piperidine as a corrosion-inhibiting substance, thereby significantly improving the corrosion-inhibiting effect of an aluminum wire or an aluminum alloy wire as compared with a case where grease containing no piperidine is applied. it can.

Hereinafter, the content of piperidine in the grease applied to the aluminum wire or aluminum alloy wire for power transmission lines according to the present invention will be described. If the content of piperidine in the grease is less than 5% by weight, a sufficient corrosion inhibitory effect cannot be obtained. On the other hand, when the content of piperidine in the grease exceeds 15% by weight, the viscosity is reduced as compared with grease containing no piperidine because piperidine is liquid at the time of mixing. For this reason, there is a possibility that the grease drips after being attached to the electric wire. For these reasons, the grease comes off, and corrosion proceeds from the exposed portion of the aluminum surface. Therefore, the content of piperidine in the grease is desirably 5 to 15% by weight.

When piperidine is mixed with grease having a high consistency in advance, it is possible to mix 15% by weight or more of piperidine. Therefore, the viscosity of the grease after mixing is also specified. That is, 0.5 × 10 ⁴ P
When the viscosity is not more than 5.0 a · s, the grease may drip. On the other hand, when the pressure is 5.0 × 10 ⁴ Pa · s or more, the grease may become brittle and peel off. 5 × 10 ⁴ to 5.0 × 10 ⁴ P
a · s is desirable.

Further, another aluminum wire or aluminum alloy wire for a power transmission line according to the present invention has a grease containing thiourea adhered to its surface, and the grease has a thiourea content of 5% by weight or less. 15% by weight,
Alternatively, the grease containing thiourea has a consistency of 190 to 250.

That is, the above-mentioned aluminum wire or aluminum alloy wire for power transmission lines uses thiourea instead of the above-mentioned piperidine as a corrosion-inhibiting substance. The effect of suppressing corrosion of the aluminum wire or the aluminum alloy wire can be remarkably increased as compared with the case where the heat treatment is performed.

Hereinafter, the relationship between the content of thiourea in grease applied to the aluminum wire or aluminum alloy wire for power transmission lines according to the present invention and the consistency of the grease will be described. As the content of thiourea in the grease increases, the consistency of the grease decreases. If the thiourea content exceeds 15% by weight, the consistency of the grease decreases, and the grease becomes brittle, causing cracks and the like. Further, if the consistency is further reduced, it becomes difficult to coat the electric wire with grease. On the other hand, if the content of thiourea is less than 5% by weight, the consistency of the grease increases, and the grease may drop after being attached to the electric wire. As a result, the grease is peeled off, and corrosion proceeds from the exposed portion of the aluminum surface. Therefore,
It is desirable that the content of thiourea in the grease be 5% by weight to 15% by weight. In addition, when the consistency is defined, the consistency is desirably 190 to 250.

The power transmission line of the present invention is characterized by using the above-mentioned aluminum wire or aluminum alloy wire for power transmission lines. By using the above-mentioned aluminum wire or aluminum alloy wire for power transmission lines, a power transmission line having excellent corrosion resistance can be realized even under various environments.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below. The transmission line of the present embodiment is made of a steel core aluminum stranded wire,
Grease is applied to the surface of an aluminum wire in a twisting process of an aluminum wire which is a part of a manufacturing process of a steel core aluminum wire. The grease contains piperidine, and the content of piperidine in the grease is set to 5 to 15% by weight. Alternatively, the viscosity of the piperidine-containing grease is 0.5 × 10
⁴ to is set to 5.0 × 10 ⁴ Pa · s.

In the transmission line of the present embodiment, since grease containing piperidine is applied to the surface of the aluminum wire, the surface of the transmission line, that is, the surface of the aluminum wire is exposed to a corrosive environment. Even in this case, since the piperidine forms a coating on the surface of the aluminum wire, corrosion of the surface of the aluminum wire can be prevented. Further, since the content of piperidine in the grease is set in the range of 5 to 15% by weight, a sufficient corrosion inhibitory effect can be obtained, and the viscosity of the grease does not significantly decrease. There is no danger of grease dripping. Thereby, the effect of suppressing corrosion of grease in the present embodiment can be sufficiently maintained.

[Second Embodiment] Hereinafter, a second embodiment of the present invention will be described.
An embodiment will be described. The power transmission line of the present embodiment is made of a steel core aluminum stranded wire, and grease is applied to the surface of the aluminum wire in a twisting step of the aluminum wire which is a part of a manufacturing process of the steel core aluminum stranded wire. Things. The grease contains thiourea, and the content of thiourea is 5 to 1
It is set to 5% by weight. Alternatively, the consistency of the thiourea-containing grease is set to 190 to 250.

In the power transmission line of the present embodiment, since the grease containing thiourea is applied to the surface of the aluminum wire, the surface of the power transmission line, that is, the surface of the aluminum wire is exposed to a corrosive environment. Even in this case, since thiourea forms a film on the surface of the aluminum wire, corrosion of the surface of the aluminum wire can be prevented. And since the content of thiourea is optimally adjusted,
The surface of the aluminum wire can be reliably protected by the grease coating without causing the formed grease coating to sag or crack.

The technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the above embodiment, grease was applied to the surface of the aluminum wire, but grease may be applied to the surface of the aluminum alloy wire. The type of grease to be used can be appropriately selected.

[0025]

EXAMPLES Example 1 An experiment was conducted to demonstrate the effect of suppressing corrosion of aluminum wires or aluminum alloy wires for power transmission lines according to the first embodiment. Hereinafter, the experiment will be described.

First, piperidine was added to commercially available grease so as to have various contents, and the mixture was completely kneaded, and the viscosity of the kneaded grease was measured. Next, in the twisting step of the aluminum wire which is a part of the manufacturing process of the steel core aluminum stranded wire to be the power transmission line, various greases previously prepared are applied to the surface of the aluminum wire, and the overhead power transmission line is formed. Produced. The content of piperidine is as follows. Example 1: 5% by weight, Example 2: 15% by weight, Comparative Example 1:
3% by weight, Comparative Example 2: 20% by weight, Conventional Example 1: 0% by weight
(No piperidine added).

As an evaluation method, the obtained overhead power transmission line was cut into a length of 100 mm, and both ends were tied with aluminum wires to prevent the stranded wire from being unraveled.
Test materials for corrosion resistance test were prepared. Thereafter, the obtained test material was subjected to a corrosion resistance test in accordance with the “Test method for accelerated weathering of rust preventive oil” specified in JIS Z0230. After that, the test material after the test was
After being immersed in an aqueous solution for 100 hours, the grease and corrosion products adhered to the surface were completely removed, and the weight of the test material was measured. The weight loss was determined from the weight of the test material before the corrosion resistance test was performed, and the weight loss per unit surface area of the aluminum wire was calculated. That is, the smaller the amount of weight loss, the smaller the progress of corrosion.

In the five test materials of Example 1, Example 2, Comparative Example 1, Comparative Example 2, and Conventional Example 1, the piperidine content in the grease used, the viscosity of the grease, and the weight loss by the corrosion resistance test were examined. The amounts are shown in Table 1 below.

[0029]

[Table 1]

As shown in Table 1 above, the test materials of Examples 1 and 2 were prepared by applying a grease containing an appropriate amount of piperidine to an aluminum wire to prepare a transmission line. In comparison, the weight loss was small, indicating that the progress of corrosion was small. That is, even if the shielding layer by the grease portion except for piperidine is torn, a coating is formed on the surface of the aluminum wire by exudation of piperidine, so that the progress of corrosion could be sufficiently suppressed.

On the other hand, in Comparative Example 1, since the content of piperidine in the grease was less than the lower limit of the range of the present invention, the corrosion inhibiting effect was not sufficiently obtained, and the corrosion inhibition effect was lower than in Examples 1 and 2. Progress speed increased. In Comparative Example 2, since the content of piperidine in the grease exceeded the upper limit of the range of the present invention, the viscosity was too low, the grease dripped off from the surface of the aluminum wire, and corrosion occurred from the exposed aluminum wire surface. Progress was confirmed. The test material of Conventional Example 1 was prepared by applying grease containing no piperidine to an aluminum wire to prepare a transmission line. After the shielding layer of the grease that shields the transmission line and the environment was broken, corrosion rapidly occurred. Advanced.

From the above results, it was proved that the content of piperidine in the grease of the present invention is suitably from 5 to 15% by weight.

Example 2 An experiment was conducted to demonstrate the effect of suppressing corrosion of an aluminum wire or aluminum alloy wire for power transmission lines according to the second embodiment. Hereinafter, the experiment will be described.

First, thiourea was added to commercially available grease so as to have various contents, and the mixture was thoroughly kneaded, and the consistency of the grease after kneading was measured. The grease before the addition of thiourea had a consistency of 230 as measured by the method specified by JIS K2200. Next, in the twisting step of the aluminum wire which is a part of the manufacturing process of the steel core aluminum stranded wire to be the power transmission line, various greases previously prepared are applied to the surface of the aluminum wire, and the overhead power transmission line is formed. Produced. The thiourea content is as follows. Example 3: 5% by weight, Example 4: 1
5% by weight, Comparative Example 3: 3% by weight, Comparative Example 4: 30% by weight, Conventional Example 2: 0% by weight (no thiourea added).

As an evaluation method, the obtained overhead power transmission line was cut into a length of 100 mm, and both ends were tied with aluminum wires to prevent the stranded wire from being unraveled.
Test materials for corrosion resistance test were prepared. Thereafter, the obtained test material was subjected to a corrosion resistance test in accordance with the “Test method for accelerated weathering of rust preventive oil” specified in JIS Z0230. After that, the test material after the test was
After being immersed in an aqueous solution for 100 hours, the grease and corrosion products adhered to the surface were completely removed, and the weight of the test material was measured. The weight loss was determined from the weight of the test material before the corrosion resistance test was performed, and the weight loss per unit surface area of the aluminum wire was calculated.

In the five test materials of Examples 3, 4, Comparative Example 3, Comparative Example 4, and Conventional Example 2, the thiourea content in the grease used and the consistency of the grease after kneading were used. Table 2 below shows the weight loss by the corrosion resistance test.
Shown in

[0037]

[Table 2]

As shown in Table 2 above, the test materials of Examples 3 and 4 were prepared by applying a grease containing an appropriate amount of thiourea to an aluminum wire to produce a transmission line, excluding thiourea. Even if the shielding layer by the grease part is broken, the thiourea oozes out to form a coating on the surface of the aluminum wire, so the weight loss is smaller than other test materials and the progress of corrosion was sufficiently suppressed. It is shown that.

On the other hand, in Comparative Example 3, the content of thiourea in the grease was small, and the effect of sufficiently suppressing corrosion was not obtained. In Comparative Example 4, the content of thiourea in the grease was large, and the consistency of the grease after kneading was reduced to 180. As a result, the grease became brittle and peeled off, and the rate of progress of corrosion increased despite containing sufficient thiourea to suppress corrosion as compared with Examples 3 and 4. Was confirmed. In addition, the test material of Conventional Example 2 was prepared by applying grease containing no thiourea to an aluminum wire to produce a transmission line, and after the shielding layer of the grease for shielding the transmission line and the environment was broken, Corrosion progressed rapidly.

From the above results, it was proved that the thiourea content was appropriately adjusted so that the thiourea content in the grease of the present invention was 5 to 15% by weight.

[0041]

As described in detail above, according to the present invention, since a grease containing a corrosion inhibitor such as piperidine and thiourea is applied to the surface, the grease is compared with the conventional product. An aluminum wire or an aluminum alloy wire having excellent corrosion resistance can be realized. And by using this aluminum wire or aluminum alloy wire,
It is possible to realize a highly reliable power transmission line having excellent corrosion resistance even under various environments.

Claims (5)

[Claims] 1. An aluminum wire or aluminum wire for a power transmission line, wherein a grease containing piperidine is applied to the surface, and the content of the piperidine in the grease is 5% by weight to 15% by weight. Alloy wire. 2. A grease containing piperidine is applied to the surface, and the grease has a viscosity of 0.5 × 10 ^4.
An aluminum wire or an aluminum alloy wire for power transmission lines, which is Pa · s to 5.0 × 10 ⁴ Pa · s. 3. An aluminum wire for a power transmission line, wherein a grease containing thiourea is applied to the surface, and the content of the thiourea in the grease is 5% by weight to 15% by weight. Or aluminum alloy wire. 4. An aluminum wire or aluminum alloy wire for a power transmission line, wherein a grease containing thiourea is applied to a surface, and the grease containing thiourea has a consistency of 190 to 250. . 5. A power transmission line using the aluminum wire or aluminum alloy wire for a power transmission line according to claim 1.