JPS6037606A - Material for transmission 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 [Field of Application of the Invention] FU 8A relates to a lightweight, high-strength conductive material, and particularly to a material for power transmission lines suitable for long spans.

[Background of the invention]

Steel core aluminum stranded wire (
ACtS standard) is widely used. The conductivity of pure aluminum wire is 62 1AC3, the specific gravity is small at 2.71, but the tensile strength is 15 kg/mm" Lk g 7
mm" or more is used for the core wire. However, since the specific gravity of the steel wire is as thick as 7.9, the apparent specific gravity of the wire made from steel-core aluminum is large, around 4.0 to 5.0. , cannot fully utilize the lightness of pure aluminum.Also, the coefficient of thermal expansion is approximately 20.0 x 10"/'C
When installing electric wires over long spans, sufficient slack must be allowed due to seasonal temperature differences, resulting in an increase in the length of the wires, which is inconvenient.

[Purpose of the invention]

An object of the present invention is to provide a power transmission line material that is lightweight, strong, has a low coefficient of thermal expansion, and is suitable for long spans.

[Summary of the invention]

The main structure of power transmission line materials is steel-core aluminum, but
As described in the prior art, the steel core has a large specific gravity and a large coefficient of thermal expansion, which is disadvantageous for long-span power transmission lines. A material with high strength and low thermal expansion without sacrificing the conductivity and lightness of pure aluminum? To achieve this, lightweight and high-strength long fibers can be used instead of steel cores. Examples of such fibers include carbon fibers, SIC fibers, aromatic fibers, alumina fibers, silica fibers, and glass fibers. Table 1 shows the specific gravity, tensile strength, and thermal expansion coefficient of these continuous fibers.

Tensile degree of steel core ij: 125 kg/mrn2. It has a small specific gravity of about 1/4, and its tensile strength is about twice that of steel wire.

Therefore, if a power transmission line is manufactured using these long fibers as a core wire, it will have the same current capacity and the same tensile strength, and the weight of the core wire will be about 1/8th.

In addition, the coefficient of thermal expansion is 1/2 or less than that of steel, which is 11 x 10'-'/cK, and sag can be reduced when the power transmission is used. As described above, the continuous long fibers described above are superior to conventional steel cores as reinforcing fibers in terms of light weight, high strength, and low thermal expansion.

Continuous fibers such as carbon fibers, SiC fibers, and aromatic fibers are
Thousands of single fibers are bundled together.

A structure for forming a power transmission line by combining these continuous fibers and A4 is shown in FIGS. 1(a) to 1(e).

Structure (a) has a bare continuous fiber bundle twisted into wires, and A
It is made by twisting four wires together. The bare continuous fibers provide strength, and At provides electrical conduction, making it a lightweight, high-strength power transmission line material.

Structure (b) is such that the surface of bare continuous fibers is coated with AAk, which has good electrical conductivity, and the fiber bundles covered with this layer are twisted to form concentric twisted wires. This structure is (a)
Compared to m-structured products, each fiber is coated with AA gold, making it more expensive to manufacture, but since the interface between the At and continuous fibers is not exposed, it is resistant to corrosion caused by rain, etc.

Structure (C) makes the bare continuous fibers more i, and also makes the IF
J&L;t/l) White IAA/Shikutenkaichi f no 1 #Jml+ΔI-covered fiber bundles were combined together. In this case, At may be coated on each single fiber one by one, or may be coated only on the outer surface of the fiber bundle.

This structure increases the strength.

That is, the structure (C) is a composite of At fibers in the outer periphery of the structure (a), and the strength is increased by the amount of the fibers in the outer periphery than in the structure (a). Therefore, it is suitable for long-span power transmission lines.

Structure (d) is a bare continuous fiber surface coated with AA]-k
T-covered continuous fiber bundles are twisted together, and Aja wire is further twisted thereon. The bare fiber bundle portion 2 inside the id (fl) structure is made into an IT continuous fiber composite. This structure has better drowsiness conduction characteristics than the structure (a).

Structure (e) is a structure in which the fibers in the outer peripheral part 1 and the inner part 3 of structure (d) are mixed and twisted.

Continuous fibers such as carbon fibers, SIC fibers, aromatic fibers and A
There are the five structures described above for combining A and A to form a feed line. These can be roughly divided into two types: those that use At wire and bare continuous fiber bundles as raw materials and are twisted into wires (structure (a)), and those that use Atk-coated continuous fibers coated with Atk on bare continuous fibers. There is a street.

For the former, it is sufficient to simply use bare continuous fibers, At wires, and all concentric strands, but for the latter, At
need to be covered.

To make fibers coated with At on the continuous fiber surface, cvp
Ate can be coated continuously by dry plating methods such as ion plating, sputtering, etc.

By changing the steel core of the conventional steel-core aluminum stranded wire to carbon fiber, SiC fiber, aromatic fiber, etc. using the above method, lightness, high strength, and
A power transmission line material with low thermal expansion properties can be obtained. .

[Embodiments of the invention]

The present invention will be explained in detail below.

Example 1 40 continuous carbon fiber bundles of 12,000 pieces with a diameter of about 7 μm
The wire was concentrically twisted with a twisting ratio of 0.5%, and 26 aluminum wires with a wire diameter of 2 mm were used around it.
The structure (a) in Table 2 is a concentric twisted wire with a twisting ratio of 2.7 inches.
Of things! ! The cross-sectional area of the uAA left behind is approximately 82 rnm”
The cross-sectional area of the C fiber was approximately 19 mm.

The tensile strength of the manufactured material containing 40 continuous carbon fiber bundles was measured to be 35 kg/mm2.

Current steel core aluminum stranded wire 81mm2 (Act).

8], the cross-sectional area of aluminum in mmJ is 83.10 m
m2 is almost the same as that manufactured in this example. The tensile strength at this time is less than 34.6 kg/rnm'2''c6, which is equivalent to the current steel core aluminum wire, and furthermore, the cross-sectional area of At is almost the same, so it has good electrical conductivity. It can be seen that they are almost equivalent.

The cross-sectional area of the steel core at this time is l 3.9 mm2, but in the case of carbon fiber, it is 19.2 mm2, which is thicker than that of steel wire. This is advantageous for power transmission lines as it improves corona characteristics.

If we measure the weight at this time, the conventional material weighs 33 per kilometer.
5kg/km, while this material -1256kg
/km, which is about 76% heavier, and when the thermal expansion coefficient is measured, it is 12.5 x 10-'/℃, which is about half the thermal expansion of the conventional material, which is about 20 x 10-7℃. I understand ζ. Is this a long span power line? When tensioning, it is advantageous because the slack can be reduced.

Furthermore, a direct current was passed through this material to examine the relationship between temperature rise and current value. When 300A flows, the temperature is 85℃.

The temperature was 95°C at 350A.

Assuming that the maximum allowable temperature is 100°C and the continuous use temperature is 90°C, the tonne flow capacity of this 131 mm2 feed line is 325°C.
It was grade A, which is almost the same as the current one, which is rare.

Example 2 AAk high-frequency high-frequency excitation ion trenching method V in which 12,000 carbon fiber bundles with a diameter of approximately 7 μm are uniformly arranged.
Added from C. Ar gas after exhausting the inside of the device to below 10-5 Torr? Introduce, 2 X I Q-'TO
The pressure inside the device was maintained at about rr, and a high frequency electric field was applied to cause glow emission throughout the device. Then, the evaporation source was heated to evaporate At and at the same time C was attached. Ion grate ink time is approximately 10 minutes.

The thickness of the ion plate inked material is approximately 4.3 mm.
AA of μm was uniformly deposited on the carbon fiber. This A
The T-coated carbon fibers were made into one fiber bundle. This diameter was approximately 1.5 m In. A total of 50 of these were made, with a twist rate of 2 inches and a concentric fit.

The tensile strength at this time was about 37 kg/mm2.

A product with a specific gravity of 2.5 and a carbon content of about 20% was obtained. The cross-sectional area of At at this time was about 94 mn12. This is the g of steel core aluminum wire 5 mm” (-1-
In other words, it corresponds to AC 8 liters 95 m 1 T 12), and the tensile strength at this time is 29 kg/mm 2 . Since the cross-sectional area of AA is the same, the electrical conductivity is the same, and the tensile strength is about 1.3 times higher. In addition, the weight at this time is 3
It was 83kg/km, but it was 308kg/km, which is about 80% heavier. The coefficient of thermal expansion is approximately the same as in Example 1, 11×10-'/°C, and is 20°C for the conventional material.
Although we have described the case where carbon fiber is used as an example, by using exactly the same method, it is possible to obtain At'i reduced electric wires using the other fibers shown in Figure 1 by using exactly the same method. . In this case as well, the produced power transmission line has excellent tensile strength, low specific gravity, and low pIA# elongation as in the case of carbon fiber.

〔Effect of the invention〕

According to the present invention, it is possible to obtain a high-voltage power transmission cable that is approximately 20% lighter than steel-core aluminum wire and has high tensile strength. Therefore, if the electric wire of the present invention is used as a transmission line, it will be about 20% lighter, so the number of steel towers can be reduced by about 20 inches. Furthermore, since the coefficient of thermal expansion is about 1/2 smaller than that of conventional transmission lines, the stress fluctuations applied to the steel tower due to seasonal temperature fluctuations are reduced, and the entire structure of the steel tower can be simplified. Also, since fiber is used instead of the conventional steel core, there is an advantage that the delivery line can be made simple.

Furthermore, the use of these fibers has the advantage that since the diameter is increased, the slope of the electric potential on the conductor surface is lowered, resulting in less corona loss.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a method of arranging At and fibers when used in a power transmission line. DESCRIPTION OF SYMBOLS 1...At wire, 2...Continuous fiber bundle, 3...At coated continuous rod 10

Claims (1)

[Claims] 1. Lightweight high-strength fibers such as carbon fibers and silicon carbide fibers and A
A material for power transmission lines, which is characterized by being composited with highly conductive metals such as t', Cu, and Ag, or alloys thereof. 2. A power transmission line material according to claim 1, characterized in that the fibers are carbon fibers, SIC fibers, aromatic fibers, alumina fibers, silica fibers, and glass fibers. 3. A power transmission line material according to claim 2, characterized in that a lightweight, high-strength bare continuous fiber bundle is used as a stranded wire, and an At wire is twisted thereon. 4. A power transmission line according to claim 2, characterized in that the surface of lightweight, high-strength bare continuous fibers is coated with At', and the AA-coated fibers are twisted to form a stranded wire. material. 5. A power transmission line material according to claim 2, characterized in that lightweight, high-strength continuous fiber bundles are twisted together. 6. A power transmission line according to claim 2, characterized in that a bundle of A4-covered continuous fibers coated with Atk is completely stranded on the surface of lightweight, high-strength bare continuous fibers, and an At wire is further stranded thereon. Materials for use. 7. In claim 2, on the surface of lightweight, high-strength bare continuous fibers: 1. a fully covered At-coated continuous fiber bundle;
A material for power transmission lines characterized by being mixed with At wires.