KR20020029539A - An overhead electric wire using high-nitrogen steel wire - Google Patents

Abstract

PURPOSE: An aluminum conductor steel reinforced conductor is provided to minimize power loss during power transmission, and achieve an improved stability for power transmission. CONSTITUTION: An ACSR conductor comprises a steel core(10) wound with a steel wire(1) constituted by a nitrogen steel; and a conductor(20) surrounding the steel core. The nitrogen steel is composed of 0.06 to 0.10 percent carbon(C), 6.0 to 15.0 percent manganese(Mn), 4.0 to 8.0 percent Ni, 16.0 to 20.0 percent chrome(Cr), 0.20 to 0.50 percent nitrogen(N) and ferrum(Fe) as a remaining constituent. Alternatively, an ACSR conductor comprises a steel core wound with a steel wire constituted by a nitrogen steel, and an aluminum conductor surrounding the steel core.

Description

Overhead transmission wire using nitrogen steel wire {An overhead electric wire using high-nitrogen steel wire}

The present invention relates to a overhead transmission line using a nitrogen steel wire, and more particularly to a overhead transmission line employing a nitrogen steel wire.

Conventional overhead conductors (ACSR) are made of seven strands of high-carbon steel wire stranded with a core material that serves as a support line for transmission lines. At this time, the tensile strength of the high carbon steel wire is about 1200MPa (about 122Kg / mm ² ), in particular has a ferromagnetic properties.

On the other hand, the core material constituting the overhead transmission line is made of a steel core that maintains the strength of the wire and the aluminum conductor responsible for the current transmission.

The power loss generated during transmission consists of the electrical resistance loss caused by the current generated from the aluminum conductor and the core loss and eddy current loss inherent in the magnetic core induced by the ferromagnetic material by the alternating current. have.

In particular, the magnetic field induced at the core during energization interferes with the current flow in the aluminum conductor, resulting in an increase in the effective electrical resistance resulting in an increase in the electrical resistance loss in the conductor.

In addition, iron loss and eddy current loss generated in the ferromagnetic steel core are released as Joule heat.

The power loss (ie, electrical energy loss) generated from overhead transmission lines not only reduces the transmission efficiency, but also converts to Joule heat, which in turn increases the transmission line temperature itself.

Excessive temperature rise in the transmission line will cause a fatal damage to the stability of the transmission line. In other words, the overhead transmission line is defined as the maximum allowable temperature in order to ensure the stability of the transmission line according to the characteristics of the component material. Normally, the maximum allowable temperature for general overhead transmission lines is specified at 90 ° C.

Therefore, the reduction of the overhead of the overhead transmission line is a very important problem not only in reducing the power loss but also in stabilizing the power transportation.

The present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a overhead transmission line that can minimize the power loss generated during power transmission of the overhead transmission line.

Another object of the present invention is to provide a overhead transmission line that can ensure the stability of the power transmission of the overhead transmission line to the maximum.

1 is a cross-sectional view of a overhead transmission line using a nitrogen steel steel wire according to a first embodiment of the present invention,

2 is a view showing a cross section of the overhead transmission line using a nitrogen steel wire according to a second embodiment of the present invention.

※ Explanation of code for main part of drawing

1: steel wire 2, 3: wire

10: strong core 20, 30: conductor

In order to achieve the above object, the overhead power transmission line using a nitrogen steel wire according to a preferred embodiment of the present invention, a plurality of steel wire stranded, each steel wire is made of a material of nitrogen steel; And a conductor surrounding the steel core.

Hereinafter, with reference to the accompanying drawings for the overhead transmission line using a nitrogen steel steel wire according to an embodiment of the present invention.

First, the main alloy components of the nitrogen steel used as the steel core of the overhead transmission line in the present invention are shown in Table 1 below.

<Table 1>

Member Fe C Mn Ni Cr N Component ratio (wt,%) bal. 0.06 to 0.10 6.0-15.0 4.0-8.0 16.0 to 20.0 0.20 to 0.50

Herein, carbon (C) in the main alloy components of the nitrogen steel is added in an amount of 0.06% or more in order to secure strength after drawing. The excess addition causes carbide to precipitate during cooling after the solid solution heat treatment, thereby lowering the ductility, so the upper limit is limited to 0.10%.

In addition, manganese (Mn) in the major alloying components of the nitrogen steel is an element that significantly increases the high capacity of nitrogen as an austenite generating element. Therefore, it is necessary to add 6.0% or more in order to maintain nonmagnetic after cold working. However, when adding a large amount, the hot workability and the corrosion resistance are lowered, so the upper limit is limited to 15%.

In addition, nickel (Ni) in the main alloy component of the nitrogen steel stabilizes the austenite phase as an austenite generating element. After cold working, add more than 4.0% to secure nonmagnetic and softness. Excess addition lowers the strength after cold working and increases the manufacturing cost, so the upper limit is limited to 8.0%.

In addition, chromium (Cr) in the major alloying components of the nitrogen steel is not only an element that increases the high nitrogen capacity and improves the corrosion resistance in the austenitic steel but also a ferrite generating element. Therefore, at least 16.0% or more is added. Excessive addition decreases hot workability and reduces ductility after solid solution heat treatment, so the upper limit is limited to 20.0%.

Finally, since the nitrogen (N) of the major alloying components of the nitrogen steel is an invasive element, it is an element that enhances the work hardening efficiency and stabilizes the austenite phase and contributes to nonmagnetic properties, and therefore, 0.20% or more is added. The excess addition does not dissolve the nitride even when the solid solution heat treatment is performed, and reduces the cold workability, toughness and ductility, so the upper limit is limited to 0.50%.

1 is a view showing a cross section of the overhead transmission line using a nitrogen steel steel wire according to a first embodiment of the present invention.

The overhead power transmission line of the first embodiment of the present invention includes a steel core 10 in which a plurality of steel wires 1 made of nitrogen steel (ultra high strength nonmagnetic steel) are stranded; And an aluminum conductor 20 enclosing the steel core 10 from the outside.

The nitrogen steel is stainless steel containing nitrogen of about 2000 ppm or more in the steel, and has a high tensile strength of about 2000 MPa (about 200 Kg / mm ² ) or more, as well as unique nonmagnetic properties.

Each steel wire 1 is aluminum coated on the outer circumference. The aluminum coating treatment for each steel wire (1) is to improve the corrosion resistance, it is possible to apply a zinc plating treatment or similar coating method instead of aluminum coating treatment. On the other hand, since the nitrogen steel is a material having excellent corrosion resistance, the steel wire 1 may not need a separate coating or plating treatment.

In the aluminum conductor 20, a plurality of rectangular aluminum wires 2 having a predetermined thickness surround the steel core 10 in a cylindrical shape, and the steel core 10 is wrapped in multiple layers.

The overhead transmission line of FIG. 1 greatly increases the cross-sectional area of the aluminum conductor 20 by making the shape of the aluminum conductor 20 into a compression type. That is, since the tensile strength (about 2000 MPa or more) of the steel core 10 is increased than the tensile strength of the steel core of the conventional high carbon steel (about 1200 MPa), the cross-sectional area of the steel core 10 can be reduced, thereby the aluminum conductor The cross-sectional area of 20 is increased by that amount.

2 is a view showing a cross section of the overhead transmission line using a nitrogen steel wire according to a second embodiment of the present invention.

The overhead power transmission line of the second embodiment of the present invention includes a steel core 10 in which a plurality of steel wires 1 made of a material of nitrogen steel (ultra high strength nonmagnetic steel) as described in FIG. 1 are stranded; And an aluminum conductor 30 surrounding the steel core 10 from the outside.

The difference between the overhead transmission line of the second embodiment and the overhead transmission line of the first embodiment is that the aluminum conductor 30 is made of a plurality of cylindrical aluminum wires 3, except for the same.

The alloy components of the nitrogen steel used in the first and second embodiments of the present invention described above are as shown in Table 2 below.

<Table 2> Alloying Elements of Nitrogen Steel

Alloy elements C Si Mn P S Ni Cr N Fe Component ratio (wt,%) 0.08 0.47 9.53 0.023 0.001 5.50 17.54 0.290 bal.

In addition, the results of evaluating the mechanical properties of the nitrogen steel of <Table 2> are compared with those of the conventional high carbon steel as shown in Table 3 below.

<Table 3>

Steel grade Tensile Strength (Mpa) Yield strength (MPa) % Elongation Permeability Nitrogen steel 1975 1660 3.9 <1.01 High carbon steel 1200 1050 8 > 1000

As described in detail above, according to the present invention, by making the steel core an ultra-high strength nitrogen steel wire, the cross-sectional area of the aluminum conductor is relatively increased while reducing the cross-sectional area of the steel core.

Further, by using the non-steel steel as the nitrogen steel, the iron loss and the eddy current loss are reduced, and the increase in effective electrical resistance is minimized.

In particular, by using the ultra-high strength and non-magnetic properties of the nitrogen steel at the same time to minimize the power loss generated during the transmission and to minimize the temperature rise of the transmission line to improve the stability of power transmission.

As a result, there is an advantage of the efficient use of energy due to the depletion of energy resources and the stable supply of electric energy, which is a core basic power source in the high-tech information society.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

Claims (11)

A plurality of steel wires are stranded, each steel wire being made of nitrogen steel; And Processed transmission line using a nitrogen steel wire, characterized in that it comprises a conductor surrounding the steel core. The method of claim 1, The alloying component ratio of the nitrogen steel is 0.06 to 0.10% of carbon (C), 6.0 to 15.0% of manganese (Mn), 4.0 to 8.0% of nickel (Ni), 16.0 to 20.0% of chromium (Cr), and 0.20 to 0.50% of nitrogen (N). , Processed transmission line using nitrogen steel wire, characterized in that the rest is iron (Fe). The method of claim 2, In the alloy component ratio of the nitrogen steel, the component ratio of carbon (C) is 0.08%, the component ratio of manganese (Mn) is 9.53%, the component ratio of nickel (Ni) is 5.50%, the component ratio of chromium (Cr) is 17.54%, and The overhead transmission line using nitrogen steel wire, characterized in that the component ratio of nitrogen (N) is 0.290%. The method of claim 1, The alloying component ratio of the nitrogen steel is 0.06 to 0.10% of carbon (C), 6.0 to 15.0% of manganese (Mn), 4.0 to 8.0% of nickel (Ni), 16.0 to 20.0% of chromium (Cr), and 0.20 to 0.50% of nitrogen (N). , Silicon (Si) 0.47%, phosphorus (P) 0.023%, sulfur (S) 0.001%, the remainder is iron (Fe) overhead transmission line using a nitrogen steel wire. The method of claim 4, wherein In the alloy component ratio of the nitrogen steel, the component ratio of carbon (C) is 0.08%, the component ratio of manganese (Mn) is 9.53%, the component ratio of nickel (Ni) is 5.50%, the component ratio of chromium (Cr) is 17.54%, and The overhead transmission line using nitrogen steel wire, characterized in that the component ratio of nitrogen (N) is 0.290%. The method of claim 1, The nitrogen steel is overhead transmission line using a nitrogen steel steel, characterized in that it has a tensile strength and nonmagnetic properties of 2000MPa or more. The method of claim 1, Each wire is a overhead transmission line using a nitrogen steel wire, characterized in that the aluminum coating on the outer circumference. The method of claim 1, Each of the steel wire is a overhead transmission line using a nitrogen steel wire, characterized in that the zinc plated on the outer circumference. The method of claim 1, Each of the steel wire is a separate transmission line and processed wire using nitrogen steel wire, characterized in that the unplated. The method of claim 1, The conductor is a plurality of rectangular aluminum wire wrapped in the steel core in a cylindrical shape, the overhead transmission line using a nitrogen steel wire, characterized in that it is wrapped in a multi-layer. The method of claim 1, The conductor is a plurality of cylindrical aluminum wire wrapped in the steel core in a cylindrical shape, the overhead transmission line using nitrogen steel wire, characterized in that it is wrapped in a multi-layer.