JPS5838894B2 - Manufacturing method of copper oxide film stranded insulated conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As power transmission capacity increases and conductor size increases, losses due to skin effect, proximity effect, etc. become a major problem.

Wire insulation is a solution to this problem, and it has already been proposed to insulate the wires with a copper oxide film.

(Refer to JP-A No. 56-9912, etc.). A conventionally proposed method is to provide an insulating film on all the wires, but this method has a low loss reduction effect even though the manufacturing cost is high.

Further, when connecting conductors, it is necessary to remove the wire insulation coating, but it is difficult to remove the coating from all the wires.

In particular, the inner layer is more difficult to remove.

The present invention insulates the strands by forming copper oxide only on the outer layer of the stranded copper wire (including segments), thereby achieving almost the same effect as when the entire strand is coated with an insulating film. A method of manufacturing an insulated conductor is provided.

Note that the term "outer layer" is used to mean the first layer and the second layer from the outside of the copper stranded wire or segment.

Summary of the invention When a copper stranded wire at room temperature is immersed in an oxidation treatment solution at about 90 to 100 degrees Celsius, a copper oxide film of the required thickness (0.5 to 2 μm) is formed.
It takes about 3 minutes to make 1.

On the other hand, when a compressed conductor made of stranded copper wire is immersed in an oxidizing solution, it takes about several seconds for the outer layer to be immersed in the solution and wetted by the second layer.

In the present invention, the copper stranded wire is immersed in the oxidizing solution to the extent that only its outer layer is immersed, then taken out immediately and kept in high-temperature air to allow the oxidation reaction to proceed. It is designed to form a copper film.

First Embodiment (FIG. 1) Reference numeral 10 denotes a copper wire made by twisting copper wires together, which continuously advances in the direction of an arrow 12.

Reference numeral 14 indicates an oxidizing solution, and contains an oxidizing solution 16.

As the oxidation treatment liquid 16, for example, a mixed aqueous solution of about 5% sodium chlorite and 5% sodium hydroxide is used.

The liquid temperature is about 90-100℃.

18 is a seal through which the stranded wire 10 penetrates in the advancing direction.

20 seems to receive the oxidation treatment liquid 16 leaking through the seal 18 and the copper stranded wire 10.

A tank 22 stores the oxidation treatment liquid 16.

A circulation pump 24 circulates the oxidation treatment liquid 16.

26 is the oxidation chamber.

The temperature inside is 90 to 10, for example, due to high temperature air 28.
The temperature is maintained at around 0°C.

30 is an air floor for moving the air 28.

A heater 32 heats the air 28 sent into the oxidation chamber 26.

A water separator 34 separates the air 28 and the oxidation treatment liquid 16.

The working copper stranded wire 10 is pre-treated with toluene, trichloroethane, caustic soda, etc. to degrease and clean the surface of each strand, and then the copper stranded wire 10 passes through an oxidizing solution tank 14 in a few seconds, and is then oxidized. It is made to pass through the chamber 26 in about 3 to 10 minutes.

Then, in the oxidizing liquid chamber 14, the oxidizing treatment liquid 16 adheres only to the outer layer portion of the copper stranded wire 10, and in the oxidizing chamber 26, a copper oxide film is formed only on the outer layer portion.

After the above process, the ladle strand 10 is washed with water to completely remove the oxidation treatment liquid adhering to its surface.

Second embodiment (Figure 2) The oxidizing liquid tank 14 is made into a sealed and pressurized type.

24 is a pressurizing pump, and 38 is a pressure control valve.

Further, 40 is a high frequency induction heating device.

"Figure 3" shows the relationship between the liquid permeation distance in the radial direction and the liquid pressure when the copper stranded wire 10 is immersed in the oxidation treatment liquid, using the immersion time as a parameter.

Therefore, the pressure of the oxidizing liquid 16 and the time for passing through it are appropriately determined so that only the outer layer of the copper stranded wire 10 is immersed in the oxidizing liquid 16. 40 to 100 strands of copper stranded wire 10
Heat to ~350°C to form a copper oxide film only on the outer layer.

When the high frequency induction heating device 40 is used, only the outer layer portion of the copper stranded wire 10 can be heated to a higher temperature, and the oxidation reaction time can be shortened.

In addition to the above-mentioned oxidation treatment liquid 16, hydrogen peroxide-based liquids can also be used.

Effects of the invention (1) A copper oxide film can be formed only on the outer layer of the copper stranded wire 10.

(2) Since only the outer layer of the copper stranded wire 10 comes into contact with the oxidation treatment liquid 16, washing with water in the next step becomes easier.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of different embodiments of the present invention, and FIG.
The figure is a diagram showing the relationship between the pressure of the liquid and the penetration distance when the copper wire 10 is immersed in the oxidation treatment liquid 16. 10: Copper stranded wire, 14: Dioxide solution, 16: Oxidation treatment solution, 26: Dioxide chamber.

Claims (1)

[Claims] 1. A stranded copper wire is immersed in an oxidation treatment solution to the extent that only its outer layer is immersed, and then taken out immediately, and then maintained in high temperature air to allow the oxidation reaction to proceed. A method for manufacturing a copper oxide film stranded insulated conductor, characterized in that: 2. The method of manufacturing a copper oxide coated wire insulated conductor according to claim 1, wherein only the outer layer is immersed in the oxidation treatment solution by controlling the immersion time. 3. Manufacture of a copper oxide coated strand insulated conductor according to claim 1, wherein only the outer layer is immersed in the treatment solution by controlling the pressure and immersion time of the oxidation treatment solution. Method.