JPS62200604A - Stranded conductor - 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 [Technical Field of the Invention] The present invention relates to a stranded wire conductor that prevents stress corrosion cracking of strands and does not cause slippage between the strands and an insulating coating layer.

[Technical profile of the invention and its problems] Overhead distribution lines (1) In submarine cables, disconnection accidents may occur due to stress corrosion cracking of the wires during long-term use. The main cause of this is that moisture such as rainwater enters from the ends of the sheathed wire into the portion of the wire where residual stress is applied, causing copper oxides, sulfide, black rust, etc. to form on the surface of the wire. It is believed that this is due to the fact that it is covered with black rust.

As a solution to this problem, benzotriazole is dissolved in liquid paraffin and applied to the conductor surface, but this method improves the lubricity between the conductor and the coating, resulting in a loss of insulation. There was a problem in that slipping occurred between the electric wire gripping portion and the sheathing, resulting in a constriction in the sheathing of the wire gripping portion.

In other words, when installing a wire, the end of the wire is held by a wire gripping device and pulled with a tensile force of several hundred to eight, but if the lubricity between the splicing conductor and the sheathing is too good, the insulation near the gripping part may deteriorate. The coating layer moves and becomes thinner, creating a constriction.

[Object of the Invention] The present invention has been made in response to such conventional problems, and has a structure that has good oxidation resistance and sulfidation resistance with the stranded wire conductor, and prevents slipping between the stranded wire conductor and the insulating coating layer. The purpose of the present invention is to provide a stranded wire conductor with a high temperature.

[Summary of the Invention] In other words, the present invention provides a stranded conductor in which a plurality of steel cables are twisted in multiple layers concentrically and an anticorrosive paint is applied to the outer periphery of the steel cables, and the conductor surface of the inner layer wire is By applying an oil-based anti-corrosion paint to the conductor surface of the outer layer wire, a non-oil-based anti-corrosion paint is applied to the conductor surface to provide excellent oxidation resistance and resistance.
This prevents slippage between the insulation coating layer and the insulation coating layer while maintaining its chemical properties.

In the present invention, as the oil-based anti-rust paint applied to the conductor surface of the inner layer wire, conventionally widely used paints can be used as they are.

As such a rust-preventing paint, 0.5 to 3 g of benzotriazole or a tenon derivative is mixed with a hydrocarbon oil that is chemically and thermally stable and hydrophobic, such as liquid paraffin, polybutene, and silicone oil. Preferably, it is blended into an oily fluid V such as

In addition, as benzotriazole derivatives, l\nzo]~
Oleylamine derivatives of lyazole are suitable. This oleylamine derivative of benzotriazole is hard and grease-like at room temperature, and is commercially available under the trade name Thiolite B-1051 (manufactured by Chiyoda Chemical Research Institute).

Furthermore, in the present invention, the anti-corrosion paint to be applied to the conductor surface of the outer layer wire is one in which 0.5 to 3 g of benzotriazole and 0.1 to 1 g of benzotriazole derivative are dissolved in 100 mβ of a volatile solvent. Preferably, 3 g of benzotriazole and 0.3 g of its derivative (1) have a great antirust effect.
If the amount is less than 5g, the oxidation resistance will be poor, and if it exceeds 3g, the solid content will remain white on the conductor surface after the solvent is dried.

Benzotriazole Tfi '9 body is 0.1g powder)il
If it exceeds 1 g, the sulfidation resistance will be poor, and if it exceeds 1 g, the oxidation resistance will be poor.

Non-oil solvents used in anti-corrosion paints for the outer layer include:
Any solvent may be used as long as it is volatile and dissolves benzotriazole and its derivatives, and the above-mentioned oily solvent may be used in combination as long as it is a small amount.

Examples of the non-oil solvent that dissolves benzotriazole and its derivatives include organic solvents such as methanol, ethanol, 1-liquid[10-ethane, trichlene, etc.].

In the present invention, any method such as a running water method, a spray method, or a dipping method can be employed as a method for applying the anticorrosive paint.

By the way, it is very effective to use an insulating coating layer around the outer periphery of the stranded wires 29 in which benzo-l-lyazole is mixed.

The amount of anti-rust paint applied is 3 to 10 (J) for the inner layer.
/ ]n2 is appropriate, and in the case of an outer layer, it is necessary to uniformly wet the entire surface with the rust preventive liquid.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing a stranded conductor manufactured according to an embodiment of the present invention.

As shown in the drawing, this stranded conductor has a stranded conductor 1 consisting of 19 twisted copper wires, and an oil-based anti-corrosion paint 2 is applied to the surface of each of the 7 strands of wire 1a in the inner layer. Painted [is]
Further, the outer layer of 12 twisted wires 1b is coated with a non-oil-based anti-corrosion paint 3, and its outer periphery is covered with an extruded plastic insulation coating 4.

In the stranded wire conductor configured in this way, the outer layer of the wires is coated with a non-oil-based anti-rust paint, so even if a large amount of tension is applied in the longitudinal direction, the insulation coating 4 near the gripping portion and the strands There is no slippage between the line conductors and therefore no constriction of the insulation coating.

In addition, since a conventional anti-rust paint is used on the surface of the inner wire, the rust prevention performance is extremely high, and since the outer wire is tightly adhered to the insulation coating layer, rainwater etc. cannot enter from the end of the wire. The number of sabushigyu Narutsuri that happens will be extremely rare.

Next, a method for manufacturing a stranded wire conductor according to the present invention will be explained with reference to FIG.

In FIG. 2, first, a plurality of copper strands 1a having 74 layers are twisted together through a die 5, and then passed through a preheating device 6 and heated at about 100°C.

By pre-heating the cable wire in this way, the penetration of the anti-corrosion paint is increased, resulting in a better response than without pre-heating).
The effect of preventing J corrosion cracking is improved. Note that as a preheating method, as long as the surface of the wire is not oxidized, for example, a method of passing the wire through boiling steam, heated inert gas, etc. can be used.

After preheating the inner layer stranded wire conductor in this way, the inner layer stranded wire conductor is continuously passed through a rust preventive paint containing a rust preventive paint (one small piece of rust preventive paint) to coat the surface of the 111 strands of the inner layer with the rust preventive paint. A rust paint (10 parts of Thiolai I-8-1051F [manufactured by Chiyoda Chemical Research Institute Co., Ltd.] mixed with 90 parts of liquid paraffin) is applied.

In addition, a pump 8 is constantly installed in the rust preventive coating tank 7 to supply the rust preventive paint to the rust preventive coating tank 7 and to infiltrate the rust preventive paint into the inside of the inner layer stranded wire conductor by applying pressure. has been done. In addition, a pressurized air jet nozzle 9 is installed close to the outlet of the inner layer stranded wire conductor for removing an excessive number of inner layer rust preventive paints from the inner layer stranded wire conductor. An appropriate amount of anti-rust paint is applied to the wire.

The inner layer conductor coated with the oil-based anti-corrosion paint in this way is twisted together through a die 10 using a plurality of wires 1b constituting the outer layer, and then a rust-preventive agent is applied by spraying a non-oil-based anti-corrosion paint. A non-oil-based rust preventive paint (benzotriazole (benzotriazole) was applied to the surface of the copper wire in a mixed solvent of methanol and trichloroethane at 100 m℃ by continuously spraying the rust preventive paint on the outer periphery of the copper wire passing through tank i tank 11. BTA) 3q, Thiolite B-10
51 [manufactured by Chiyoda Chemical Research Institute (Co., Ltd.])) A rust-preventing paint containing 0.3 CI is applied.

Thereafter, an insulating coating 13 is extruded onto the outer periphery of the stranded wire conductor 1 by an extruder 12.

Next, in order to confirm the effects of the stranded wire conductor thus obtained, tests were conducted on sulfidation resistance, oxidation resistance, and tensile strength.

The sulfidation resistance test was conducted by immersing the sample IEI in sodium sulfide (sulfate ion concentration: 10,100 pp) at 60° C. for 1 minute, washing with water, and visually inspecting the degree of discoloration of the stranded wire conductor.

In addition, for the oxidation resistance test, the sample was immersed in a corrosive solution of ammonia water (ammonia ion concentration 200 ppm) at 60'C with both ends cut off. After 4 weeks, the sample was disassembled and the outer layer wire and inner layer wire were separated. Rust was removed using diluted hydrochloric acid solution (1:1), and the average film thickness (μm) was calculated from the weight loss, assuming that the base of the oxide film formed on the surface was cupric oxide.

In the rough tensile strength test, one side of the stranded wire conductor is fixed, the other is gripped with a gripping device from above the insulation coating, a handle is attached to the gripping part at an interval of 1 m, and the test is carried out every 5 minutes for 10 minutes.
While increasing the load by 8 to 0, the tensile strength was defined as the tensile strength of 114, at which the diameter of the conductor changed from 15 m1 to 12+n2 due to constriction.

The results are shown in the table below. (The following is a blank space) [Effects of the invention] As is clear from the above examples, according to the present invention,
The inner layer surface of the stranded wire conductor is coated with a synthetic oil-based anti-corrosion paint, and the outer layer surface is treated with a non-oil-based anti-rust paint.
It has excellent stress corrosion cracking prevention effects and strong resistance to constriction.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view of a stranded conductor according to the present invention. FIG. 3 is a diagram for explaining an example of a manufacturing method A. FIG. 1...Twisted conductor 1a...Copper wire 1b for inner layer...
... Copper wire for inner layer 2 ... Oil-based rust prevention method ] 3 ... Non-oil-based rust prevention paint 4・・・・・・・・・・・・Insulation coating 5.10...Dice

Claims (3)

[Claims] (1) In a stranded wire conductor made by concentrically twisting multiple copper wires in multiple layers and applying rust-preventive paint to the outer periphery of the copper wires, the conductor surface of the inner layer wire is coated with an oil-based rust-preventive paint. A stranded wire conductor characterized in that a non-oil-based antirust paint is applied to the conductor surface of the outer layer wire. (2) The stranded wire conductor according to claim 1, wherein the anticorrosive paint contains benzotriazole. (3) The stranded wire conductor according to claim 1 or 2, wherein the non-oil-based antirust paint is one in which benzotriazole and its derivatives are dissolved in a volatile solvent.