JPS6032928B2 - Composite stranded wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the characteristics of overhead power transmission lines known as steel core aluminum stranded wires (ACSR), and in particular to composite stranded wires characterized by less sag when the power transmission lines are overhead wires. It's about lines.

Various considerations have been made in the past regarding the sag of overhead power transmission lines. Gap type A which can reduce the current carrying capacity and increase the current carrying capacity.
CSR is well known.

The present invention uses Fe-N, which has a small coefficient of thermal expansion, instead of steel wire.
It is characterized by reducing the sag by using an i-based alloy, and is aimed at improving the sag of a composite stranded steel wire having the structure already proposed in JP-A-48-100671.

The present invention uses 30 to 50% Ni, Tio. Contains one or more of Mn, Cr, Co, C, P, S, Sj, mountain and Cu in a total amount of 2% or less, and contains 8 to 5% by the final size.
It is a composite fuel wire characterized by being made by twisting an Fe alloy wire which has been subjected to 0% or more of inter-edge workability and a wire made of an electrical thread or a thread alloy containing 0.28% or less of Zr. .

The present inventors have demonstrated that cold working is 90% for Fe-Ni binary alloys.
Even if applied at nearly 0%, the strength is at most 90k9/m2, but by adding a certain amount of Ti to the Fe-Ni alloy,
The Tio. 5~
It was confirmed that a Fe-30 to 50% Ni alloy containing 5% of Ni was suitable as evaluated from the characteristics of strength, coefficient of thermal expansion, and workability.

In the Fe alloy wire used in the present invention, when Ni is less than 30%, the coefficient of thermal expansion does not decrease compared to a steel wire, and when it exceeds 50%, the coefficient of thermal expansion behaves similarly.

Further, if Ti is less than 0.5%, there is no effect on increasing the strength, and if it exceeds 5%, workability is significantly deteriorated. In addition, Mn, Cr, Co, C, P, S, Si, AI and Cu with a total amount of 2% or less
There is no problem with including one or more of the following, especially 0
．． 5% to 1.2% Mn can be added to improve hot workability. Moreover, the Fe-Ni-T of the present invention
I-series alloys are cold-worked by 80% or more to reach their final size, as this is necessary to improve their strength and coefficient of linear expansion.

Regarding this alloy, please refer to Mess Handbook, VO.
L. 1, is h Editor P. 816-819(
American Society for Metals
As already revealed in the publication), the melting process,
135k in the processing process of water tanning, lining processing, and age hardening.
Although the tensile strength of 9/Grandson has been obtained, in this case,
It is necessary to age harden at a temperature above the inflection point of the coefficient of thermal expansion of the Fe-Ni-Ti alloy, and although the coefficient of thermal expansion is smaller than that of steel wire, it becomes a value close to that of steel wire, which is not preferable because the merit disappears. As in the present invention, by adding 80% or more of the line spacing to the final size, both strength and coefficient of thermal expansion can be improved. Further, in the present invention, Zn or AI is coated on the Fe alloy wire to form an F
There is no problem in improving the corrosion resistance of the e-alloy wire and preventing contact corrosion with the AI wire, and the coating methods include lightning plating, melt plating, pressure molding, and extrusion molding.

Next, in the present invention, as a mountain line, 0.28% or less Zr
When using an AI alloy containing stranded wires, the coefficient of thermal expansion is small and the sag can be reduced in the state of composite stranded wires, as described below. It can be used at higher temperatures than stranded wire, giving it an added advantage.

The reason why Zr is set to 0.28% or less is that if it exceeds 0.28%, there is no effect of further improving heat resistance and the electrical conductivity decreases. Further, there is no problem with the inclusion of other elements normally added to this type of alloy and impurities normally contained in AI. The present invention will be explained below with reference to Examples.

Example 1: Ni 37.5%, Ti l. 1%, Mn 0.7%,
P.O. 01%, CO. 01%, Si o. 09%,
Coo. 27%, Cuo. 07%, SO. 007%,
AIO. A Fe-Ni-Ti alloy consisting of 0.01% and the balance Fe was cast into a mold on the 40th side, and hot worked to obtain a rough drawing line on the 12th side.

The following processing was performed while adding wire drawing processing from the 12th side.

No. 1 Wire drawing processing up to 3 degrees without heat treatment (invention) No. After solution treatment at 1000 qo for 1 hour at the 25th rib, water quenching was performed, wire drawing was performed up to the 3rd side, and then aging was performed at 550 qo for 5 hours.

(Comparative example) No. The properties of wire rods Nos. 1 and 2 were as shown in Table 1.

Table I Note: * indicates the average coefficient of thermal expansion from room temperature to 200 x 0.

As is clear from Table 1, the wire rod according to the present invention has a strength of A
It is equivalent to the steel wire used in CSR, and has a significantly smaller coefficient of thermal expansion. In comparison, the age-hardened wire rod of the comparative example has high strength, but the coefficient of thermal expansion decreases at a smaller rate than that of steel.

Example 2: Ni 41.5%, Ti 2.7%, Mno. 94%
,P.O. 01%, CO. 01%, Si o. 07%
, Coo. 42%, Cuo. 06%, SO. 009%
, AIO. 01%, balance Fe-Ni-Tj
The alloy was processed in the same processing steps as in Example 1.

Here No. 3 is No. 1 and M. 4 is No. Same as 2-
The processing process was as follows. The results of investigating the characteristics of the wire rods are as shown in Table 2. Table 2 Note: * indicates the average coefficient of thermal expansion from room temperature to 200 oo.

As is clear from Table 2, the wire rod according to the present invention was obtained in Example 1.
Similarly, the strength is the same as that of steel wire, and the coefficient of thermal expansion is extremely small.Although the comparative example has high strength, the coefficient of thermal expansion is close to the value of steel wire. Example 3: The alloy shown in Example 1 and the alloy shown in Example 2 were
The wire was drawn from the side rough drawing wire to the 3.1-length wire, and the seven strands were twisted together to form a core wire.

Zro. 11.7 skin of AI alloy containing 12%? from 4
Twenty-six strands of wire drawn to the side were twisted together on top of the Fe--Ni--Ti alloy stranded wire to make a composite stranded wire. For comparison, a normal steel wire 7 with the same structure as this composite stranded wire
A conventional ACSR having a core wire made of twisted books was prepared, and the thermal expansion characteristics of the Enoki twisted wire were measured. The results are in Table 3
It was as shown in Table 3 Note: * indicates the average coefficient of thermal expansion from room temperature to 20,000.

As is clear from Table 3, the thermal expansion coefficient of the composite stranded wire according to the present invention is significantly lower than that of the conventional ACSR. Example 4: 7/3.1 fence made from the alloy shown in Example 2 using the same processing steps as Example 3? electrical aluminum and Zro. A composite stranded wire having the same structure as Example 3 was made by twisting together 26 strands of the fourth side of the N alloy containing 0.06%.

Regarding these stranded wires, the thermal expansion characteristics as composite stranded wires were measured in the same manner as in Example 3.

The results were as shown in Table 4. Table 4 Note: * indicates the average coefficient of thermal expansion from room temperature to 200°C.

As is clear from Table 4, the composite stranded wire according to the present invention has AI
It can be seen that the coefficient of thermal expansion is significantly reduced due to the characteristics of the Fe-Ni-Tj alloy of the core wire, regardless of the material of the wire.

As described in the examples above, since the Fe-Ni-Ti alloy wire of a predetermined composition used as the core wire of the present invention has a small coefficient of thermal expansion, the coefficient of thermal expansion of the composite stranded wire is lower than that of conventional ACSR. Compared to conventional ACSR, it is smaller in size and can reduce the sag after the transmission line is installed.Compared to conventional ACSR, the height of the tower can be lowered, the operating temperature can be raised, and the same tower as the conventional ACSR can be used. Even if ACSRs of the same size are connected to overhead lines, significant effects such as an increase in current carrying capacity can be expected.

Claims (1)

[Claims] 1 Contains 30-50% Ni, 0.5-5% Ti, and one or more of Mn, Cr, Co, C, P, S, Si, Al, and Cu in a total amount of 2% or less, and 80% by the final size.
A composite stranded wire characterized in that it is made by twisting an Fe alloy wire subjected to the above degree of cold working and a wire made of electrical Al or an Al alloy containing 0.28% or less of Zr.