KR101565447B1 - Ultra high strength coated steel wire for overhead transmission and distribution conductor - Google Patents

Abstract

The present invention relates to an ultra high strength plated steel wire for processed and distributed transmission lines, which comprises 0.88 to 0.96% by weight of C (carbon), 1.1 to 1.5% by weight of Si (silicon), 0.3 to 0.7% by weight of Mn (manganese) 0.001 to 0.02% of S (sulfur), 0.001 to 0.3% of Cu (copper) and 0.2 to 0.4% of Cr (chromium), the balance being Fe (iron), and a tensile strength of 180 to 250 kgf / ² , and the plated steel wire is galvanized or zinc-aluminum-micro metal alloy plated or aluminum coated steel wire, and the plating amount is 230 to 275 g / mm < ² > And the conductivity of the plated steel wire is 7 ~ 8% IACS. The present invention is a super high strength galvanized steel wire for processed and distributed transmission lines, comprising 0.95 to 1.0% of C (carbon), 1.1 to 1.5% of Si (silicon), 0.3 to 0.7% of Mn (manganese) (Iron), and a tensile strength of 180 to 250 kgf / cm < 3 > mm ² , and the plated steel wire is galvanized or zinc-aluminum-micro metal alloy plated or aluminum-coated steel wire, and the plating amount is 230 to 275 g / mm ² It is also technically essential to use ultra-high strength galvanized steel wire for processing and transmission lines where the electroplated steel wire has a conductivity of 7 to 8% IACS. Accordingly, by applying a super high strength plated steel wire having a high tensile strength to a steel material used for transmission and distribution wires, it is possible to increase the tensile load of the wire, thereby increasing the maximum use tension of the wire and drastically reducing the wire disconnection. Not only the transmission capacity can be increased as much as the present invention, but also it is advantageous that the transmission line can be used over a longer length than the conventional line span.

Description

TECHNICAL FIELD [0001] The present invention relates to an ultra high strength coated steel wire for overhead transmission and distribution,

The present invention relates to an ultra high strength plated steel wire for processing and transmission lines, and more particularly, to a high tensile strength plated steel wire having a high tensile strength applied to a steel material used for transmission and distribution wires, thereby increasing the tensile load of the wire, The present invention relates to a super high strength plated steel wire for a processed transmission line which can be used over a long distance longer than a conventional line span as well as capable of increasing the transmission capacity by decreasing the islands of the wire by increasing the use tension.

Generally, processed and distributed wires are basically composed of aluminum wire and steel wire, and they are classified into working transmission line and working distribution line.

The machined transmission line is composed of aluminum wire and steel wire. In case of processing distribution wire, the surface of the wire is covered with the same structure as that of the working transmission wire for insulation.

As shown in FIG. 1, the conventional ACSR (Aluminum Conductor Steel Reinforced) is formed of a plurality of strands of aluminum or aluminum alloy conductors (not shown) on the outer periphery of a steel core 10 made of a plurality of strands of zinc- 3) were used. At this time, the high carbon steel wire 1 has a tensile strength of about 130 kg / mm 2.

In the case of transmission and distribution lines, the aluminum conductors are mainly responsible for the transport of current, while the steel wires serve as support lines for pulling the wires from the tower or pole. That is, in the case of the processed and delivered wire, when the wire is installed in the steel tower or the electric pole according to various characteristics of the constituent material such as the steel wire, the deflection becomes different, and the deflection is numerically expressed.

As shown in FIG. 2, when there is no difference in elevation between the supporting points of the steel towers, the diagrams of the wires can be simply expressed as follows.

Where D is the isodose, S is the span, T is the horizontal tension applied to the wire, and W is the composite load applied to the wire.

As can be seen from the above equation, it can be seen that D increases when T, i.e., the horizontal tension applied to the wire is large. That is, the horizontal tension of the wire can be made larger as the horizontal tension applied to the wire is made larger.

On the other hand, the tension of the wire is achieved by using a material having a high tensile strength as each constituent material. In particular, since the tensile load of a wire depends largely on the tensile strength of the steel wire rather than the Al wire, the use of an ultra-high strength steel wire makes it possible to lower the transmission line.

The low-pass of the transmission line can increase the transmission capacity on the one hand and contribute to the increase of the transmission capacity.

Korean Patent Application Publication No. 10-2004-0064765 (published date: July 21, 2004)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a high strength, high strength plated steel wire having high tensile strength, It is an object of the present invention to provide an ultra-high strength plated steel wire for a processed and distributed transmission line which can be used for a longer length than a conventional line span as well as increase the transmission capacity by drastically reducing the tension of the wire, .

In order to achieve the above object, the present invention provides an ultra high strength galvanized steel wire for processed and distributed transmission lines, comprising: 0.88 to 0.96% by weight of C, 1.1 to 1.5% of Si, 0.3 to 0.7% of Mn, 0.001 to 0.02% of P, 0.02% of Cu, 0.001 to 0.3% of Cu and 0.2 to 0.4% of Cr and the balance of Fe and a tensile strength in the range of 180 to 250 kgf / mm ² . The present invention relates to a super high strength plated steel wire for processed and distributed transmission lines, comprising 0.95 to 1.0% of C, 1.1 to 1.5% of Si, 0.3 to 0.7% of Mn, 0.001 to 0.025% of P, 0.001 to 0.025% of S, %, 0.5 to 0.95% of Cr, the balance being Fe, and a tensile strength in the range of 180 to 250 kgf / mm ² .

Here, the plated steel wire has a diameter of 3.5 mm, an elongation of 4.5% or more, and a twist characteristic of 16 times or more.

Accordingly, by applying a super high strength plated steel wire having a high tensile strength to a steel material used for transmission and distribution wires, it is possible to increase the tensile load of the wire, thereby increasing the maximum use tension of the wire and drastically reducing the wire disconnection. Not only the transmission capacity can be increased as much as the present invention, but also it is advantageous that the transmission line can be used over a longer length than the conventional line span.

The present invention according to the present invention has a structure in which a super high strength plated steel wire having a high tensile strength is applied to a steel material used for a transmission and distribution wire to increase the tensile load of the wire and thereby increase the maximum use tension of the wire, It is possible not only to increase the transmission capacity by the reduced number of turns but also to use the system even for a longer length than the conventional line span.

1 is a cross-sectional view of a machined transmission line according to the prior art,
Fig. 2 is a schematic view showing the method according to the present invention. Fig.

In order to achieve the above object, the present invention provides an ultra high strength plated steel wire which is employed as a steel core of a processed power transmission line. The steel wire comprises C 0.88 to 1.0% C, 1.1 to 1.5% Si, 0.3 to 0.7% Mn, 0.001 to 0.025% S 0.001 to 0.025%, 0.001 to 0.3% of Cu, and 0.2 to 0.95% of Cr, and the balance of Fe and other unavoidable impurities. The super high strength plated steel wire capable of greatly increasing the maximum use tension of the processed transmission / do.

The ultra high strength plated steel wire has a tensile strength of 180 kg / mm 2 or more, a maximum of 250 kg / mm 2, a elongation of 4.5% or more, and a torsion characteristic of 16 times or more when the diameter is 3.5 mm. In the case of plating, one of zinc plating, zinc-aluminum-micro metal alloy plating or aluminum coating should be carried out.

Here, it is preferable that the steel core is produced by twisting seven strands of super-high strength plated steel wire.

The plating steel wire of the present invention is used to form a steel core, and a machining power transmission line having a steel core supporting the power transmission line and an aluminum or aluminum alloy conductor for carrying electric current to the outer periphery thereof is manufactured.

The ultra high strength plated steel wire having the above chemical composition range is pulled and drawn so as to have a tensile strength of not less than 200 kg / mm 2, a elongation of not less than 4.5% and a torsional characteristic of not less than 16 times, Aluminum-micro metal alloy so as to have a plating amount of 230 to 275 g / mm ² , that is, an electrical conductivity of the plated steel wire of 7 to 8% IACS, and the above hot- A stranded core is manufactured, and a transmission capacity-increasing transmission line is produced by twisting an aluminum or aluminum alloy conductor around the outer periphery of the core.

That is, the amount of plating applied to the steel wire for the transmission line is determined in consideration of the corrosion rate (g / m ² / year) of the zinc-plated film in order to ensure corrosion resistance against industrial pollutants or salt in the atmosphere.

However, in the present invention, paying attention to the power loss of the transmission line and controlling the amount of zinc plating on the steel wire, it is possible to increase the electric conductivity of the galvanized steel wire, thereby reducing the power loss of the transmission wire.

It is possible to further increase the electrical conductivity by increasing the thickness of the plated film to a great extent. However, in order to increase the electrical conductivity of the steel wire while maintaining the cost rise as much as possible, m < ^{2 &} gt ;.

In this case, the conductivity of the galvanized steel wire can be 7 to 8% IACS, which reduces the power loss of the entire transmission line.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings, from the viewpoint of processed power lines. The present invention is characterized in that, in place of a plurality of stranded strands of a conventional galvanized low-strength steel wire, a super high-strength steel wire stranded with zinc-aluminum-micro metal alloy is stranded .

When an ultra-high strength plated steel wire having a tensile strength in the range of 180 to 250 kgf / mm ² is used as a material for a steel cord of a transmission line unlike the case of using a steel wire having a tensile strength in the range of 130 to 180 kgf / mm ² , As can be seen, since the minimum tensile load of the wire can be greatly increased, the wire can be fixed to the steel tower or electric pole by pulling it with a larger tension, which can advantageously reduce deflection of the wire.

If the conductor becomes smaller, this will have the effect of increasing the transmission capacity of the line. This can reduce the power of the cable, which can increase the transmission capacity by a certain amount in the region where the load is increased. That is, the following effects can be expected.

Increase of tensile load of wire -> Increase of wire tension -> Reduction of island -> Increase of transmission capacity

Generally, in the case of electric power companies, if the load increases in a special area, the transmission capacity should be increased accordingly. However, since the road on the installed line is basically defined, the limit of not increasing the transmission current is encountered. Therefore, it is necessary to use an in-line alloy steel transmission line capable of suppressing the displacement while increasing the transmission capacity. However, in this case, it is not easy to apply because the cost of the cable is 6 to 7 times higher than the general ACSR. , It is possible to multiply 1.8 times the transmission capacity as compared with ACSR. However, since it is obvious that the application of such a capacity transmission line is excessive investment in consideration of the fact that there is almost no area where the load is doubled or more rapidly, And the like.

Therefore, when the necessity of increase of the transmission capacity due to a gradual increase of the load arises, it is necessary to provide a wire which is low in price and functionally problem-free. At this time, it is possible to effectively apply the super high strength galvanized steel wire It is very important to increase the tensile load of the transmission line to reduce the roadway and to utilize the effect of increasing the transmission capacity by that amount.

Accordingly, in the present invention, when an ultra-high-strength plated steel wire in the range of 180 to 250 kgf / mm ² is used as a material for the conductor of a transmission line, the tensile load of the wire is maximized and the wire tension is maximized when the wire is installed in a tower or an electric pole. To minimize the diversion of.

In this way, a surplus can be secured to increase the transmission capacity by the reduced number of times.

Hereinafter, it will be examined how much the tensile strength can be reduced when the tensile strength of the steel wire is increased.

In the present invention, plated steel wires having the components shown in the following Table 1 were used.

Table of alloy composition (wt%) division C Si Mn P S Cu Cr Fe One 0.88-0.96 1.1 to 1.5 0.3 to 0.7 0.001 to 0.02 0.001 to 0.02 0.001 to 0.3 0.2 to 0.4 honey 2 0.95 to 1.0 1.1 to 1.5 0.3 to 0.7 0.001 to 0.025 0.001 to 0.025 0.001-0.2 0.5 to 0.95 honey

A plated steel wire having the above-described alloy composition was prepared, and a super high strength plated steel wire having a tensile strength of 250 kgf / mm ² was formed. And the minimum tensile load of the transmission line was calculated.

In the case of, for example, a common transmission line as a comparison, the transmission lines of the ACSR 410mm ^2, was used as the diameter of 3.5mm, 130kgf / mm ² Minimum tensile strength, as described above, this time using the ultra-high strength plated steel wire of tensile strength of 250kgf / mm ² , The minimum tensile load of the transmission line is calculated as follows. However, it is assumed that the aluminum conductor has the same strength.

Change of tensile load of wire by use of super high strength steel wire ACSR 410mm ² Tensile strength of steel wire Tensile strength of Al conductor Tensile load of wire Existing wire 130 kgf / mm ² 16.2 kgf / mm ² 13,890 kgf Ultra high strength steel wire 250 kgf / mm ² 16.2 kgf / mm ² 21,976 kgf

That is, as shown in Table 2, the tensile strength of the transmission line increases by 58% as the tensile strength of the steel wire increases by a factor of two.

As shown in Equation (1), as can be seen from the equation of the electric wire, the electric conductor is inversely proportional to the tension of the electric wire.

The diagrams of Examples and Comparative Examples of the present invention are calculated using Equation (1) as shown in Table 3 below.

The ACSR 410 mm ² islands (span 400 m) ACSR 410mm ² Wire tensile load wire
Maximum use tension Transition temperature (캜) Islands (m) Existing steel wire (130kgf / mm ² ) 13,890 kgf 5,000 kgf 141 15.8 Ultra high strength steel wire (250kgf / mm ² ) 21,976 kgf 7,850 kgf 167 11.9

As can be seen from Table 3, by using the ultra-high strength high strength steel wire according to the present invention, the maximum use tension of the wire is greatly increased, and thus the hardness is drastically reduced.

In Table 3, it can be seen that the present invention has a decrease of about 4 m in endurance compared to the existing steel wire.

Considering that a current of 300 to 350 amperes can be further transmitted per 1 meter of this road, an increased transmission of 1,200 to 1,400 amperes is possible. That is, it means that it is possible to increase the transmission capacity more than twice the continuous allowable current of ACSR 410 mm ² .

As described above, according to the present invention, there is provided an ultrahigh-strength galvanized steel wire for processed and distributed transmission lines, comprising 0.88 to 0.96% by weight of C, 1.1 to 1.5% of Si, 0.3 to 0.7% of Mn, 0.001 to 0.02% of P, And the balance of Fe and other unavoidable impurities, or 0.95 to 1.0% of C, 1.1 to 1.5% of Si, 0.3 to 0.7% of Mn, 0.001 to 0.3% of Cr, 0.001 to 0.3% of Cu and 0.2 to 0.4% of Cr, 0.025%, S 0.001-0.025%, 0.001-0.2% Cu and 0.5-0.95% Cr and the balance consisting of Fe and other unavoidable impurities, and having a tensile strength in the range of 180-250 kgf / mm ² It was confirmed that the ductility decreased when the super high strength coated steel wire was manufactured. It can be seen that the transmission capacity increases with the decrease in the flight.

In the above embodiment, the machined transmission line is described. However, in the case of the steel wire of the present invention, the same can be used as a material for the core of the machined distribution line, and the same characteristics and effects as those of the machined transmission line can be obtained.

Claims (3)

A super high strength galvanized steel wire for processing and transmission lines, comprising 0.88 to 0.96% of C (carbon), 1.1 to 1.5% of Si (silicon), 0.3 to 0.7% of Mn (manganese), 0.001 to 0.02% of P (phosphorus) 0.001 to 0.02% of Cu, 0.001 to 0.3% of Cr, 0.2 to 0.4% of Cr and the balance of Fe (iron) and a tensile strength of 180 to 250 kgf / mm ² The degree of reduction is controlled,
The plated steel wire is galvanized or zinc-aluminum-micro metal alloy plated or aluminum coated steel wire, and the plating adhesion amount is 230 to 275 g / mm < ² > And the conductivity of the plated steel wire is 7 ~ 8% IACS. A super high strength galvanized steel wire for processing and transmission lines, comprising 0.95 to 1.0% of C (carbon), 1.1 to 1.5% of Si (silicon), 0.3 to 0.7% of Mn (manganese), 0.001 to 0.025% of P (phosphorus) and sulfur) 0.001 ~ 0.025%, Cu (copper), 0.001 ~ 0.2% Cr (chromium) is made of a 0.5 to add Fe (iron) contained in the glass of 0.95%, a tensile strength of 180 ~ 250 kgf / mm ² range The degree of reduction is controlled,
The plated steel wire is galvanized or zinc-aluminum-micro metal alloy plated or aluminum coated steel wire, and the plating adhesion amount is 230 to 275 g / mm < ² > And the conductivity of the plated steel wire is 7 ~ 8% IACS. The super high strength plated steel wire according to claim 1 or 2, wherein the plated steel wire has a diameter of 3.5 mm, an elongation of 4.5% or more, and a twist characteristic of 16 times or more.

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