JPH0195410A - Superconducting power-transmission line - Google Patents

Abstract

PURPOSE:To reduce a transmission loss together with the embodiment of good superconducting characteristics and the application of a long size and the like by housing a ceramic superconducting wire material in a length-wise groove formed on the external surface of a long-sized reinforcement member and enclosing the whole structure with an outer pipe. CONSTITUTION:Three grooves 2 extending in a length-wise direction are formed at the predetermined peripheral position of a long-sized reinforcement member 1 of stainless steel. A ceramic superconducting wire material 3 made from (Y0.2Ba0.8)2CuO and the like is housed in the grooves 2. The aforesaid reinforcement member 1 fitted with the wire material 3 is inserted roughly compactly in an outer pipe 4 of stainless steel. Furthermore, a high tensile wire material 5 comprising an aluminum wire, an aluminum alloy wire, an aluminum shielded wire, a carbon film wire and the like is wound as stranded about the external surface of the outer pipe 4. According to the aforesaid construction, it is possible to embody good superconducting characteristics and obtain a sufficiently long- sized superconducting transmission line. Also, resistance against high tension is available and an overhead power-transmission line having a small transmission loss is available.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to superconducting power transmission lines, and more specifically,
This article relates to a new superconducting power transmission line using ceramic superconducting materials.

<Problems to be solved by conventional technology and invention> Conventionally,
Hard copper wire (HP CC) and steel core aluminum stranded wire (ACSR) have been used as power transmission lines, but they have the drawback of high transmission losses due to electrical resistance.

On the other hand, with the recent discovery of ceramic superconductors having a considerably high critical temperature, power transmission lines using ceramic superconductors have been proposed in order to reduce the above power transmission loss. For example, a ceramic superconducting material powder is coated in advance with a ceramic metal sheath, the desired wire diameter is achieved by surface reduction processing, and the superconducting properties are improved by heat treatment for several hours at a temperature higher than 900°C. There are some attempts to use the superconducting wire obtained in this way as a power transmission line.

However, even if heat treatment is applied to ceramic superconducting material powder coated with a metal sheath, the supply of elements such as oxygen required to develop superconducting properties is insufficient, and sufficient superconducting properties do not develop. I can't do it.

Furthermore, even if some measure is taken to provide a sufficient amount of the elements necessary to exhibit superconducting properties, such as oxygen, the ceramic superconducting material will shrink due to heat treatment. Therefore, even if the superconducting wire is coated with a metal sheath in advance, a very long superconducting wire cannot be obtained.

Furthermore, even if long superconducting wires could be obtained by taking some measures, ceramic superconducting materials cannot withstand high elongation stress, so they cannot be used as overhead power transmission lines that require high tension. There is.

<Object of the invention> This invention was made in view of the above problems,
The objective is to provide a superconducting power transmission line that exhibits good superconducting characteristics, can be made sufficiently long, can withstand high tension, and can realize overhead power transmission with low transmission loss. .

Means for Solving the Problems> In order to achieve the above object, a superconducting power transmission line of the present invention has a longitudinally extending groove formed around a long reinforcing member, and a groove inside the groove. A ceramic superconducting wire is housed in the pipe, and the whole is surrounded by an outer pipe, and reinforcing wire is twisted and wound around the outer circumference of the outer pipe.

In the superconducting power transmission line with the above configuration, a groove extending in the longitudinal direction is formed around the elongated reinforcing member, and
A ceramic superconducting wire is housed inside the groove.
Moreover, since the entire structure is surrounded by an outer pipe, even though the ceramic superconducting wire itself has disadvantageous characteristics such as brittleness and difficulty in handling,
By housing it in the groove of the reinforcing member and surrounding it with an outer pipe, it is possible to overcome the above-mentioned disadvantageous characteristics and make it easier to handle, thereby making it possible to significantly increase the length of the reinforcing member. In addition, when ceramic superconducting wire is sintered, shrinkage occurs and a gap is created between it and the outer pipe, so the necessary elements can be supplied through this gap and good superconducting properties can be achieved. In addition, even if shrinkage occurs due to sintering, the ceramic superconducting wire can be accommodated in the groove, so it is possible to significantly lengthen the wire from this point of view as well.

Furthermore, in addition to the reinforcing members as mentioned above, reinforcing wires are twisted and wrapped around the outer periphery of the outer pipe, so the whole can withstand high tension, and has the above-mentioned good properties. Together with the appearance of superconducting properties and the achievement of long lengths, it can be used as overhead power transmission lines that require high tension.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 1 is a longitudinal sectional view showing an embodiment of a superconducting power transmission line of the present invention, and FIG. 2 is a schematic perspective view of an outer pipe. As shown in FIG. 2, three grooves (2) extending in the longitudinal direction are formed at predetermined positions on the circumferential surface of a long reinforcing member (1) made of stainless steel.
a) Cu 0.20.
A ceramic superconducting wire (3) having a composition of
is housed in. The reinforcing member (1) and the ceramic superconducting wire (3) accommodated in the groove (2)
is inserted almost tightly into the outer pipe (4) made of stainless steel. Furthermore, as shown in Fig. 1, high-tensile wire rods (5) made of aluminum wire, aluminum alloy wire, aluminum clad steel wire, carbon fiber wire, etc. are twisted around the outer periphery of the outer pipe (4). It is wrapped in condition.

FIG. 3 is a schematic diagram illustrating the process of manufacturing a superconducting power transmission line with the above configuration, in which a base material for the ceramic superconducting wire (3) and a base material for the reinforcing member (1) in which grooves are formed are prepared. Then, the base material for the ceramic superconducting wire (3) is accommodated in the groove of the base material for the reinforcing member (1), and then the whole is corrugated with an outer pipe made of stainless steel. Thereafter, the entire wire is drawn until it has a predetermined outer diameter, and in this state, it is heated at a temperature higher than 900°C for at least several hours while supplying oxygen-containing gas from the end face of the outer pipe (4). By performing the heat treatment described above, a superconducting power transmission line having the configuration shown in FIGS. 1 and 2 can be obtained.

However, as the raw material for the ceramic superconductor constituting the ceramic superconducting wire, any material that contains the elements constituting the superconductor can be used in either the form of a single substance or a compound, and the raw materials used in this example For example, a composition represented by the following general formula is preferable because it has a high critical temperature.

Aa Bb Cc (wherein A is at least one element selected from Group Ia elements, Group IIa elements, and Group ■a elements of the Periodic Table; B is an element of Group 1b of the Periodic Table; and Group IIIb elements of the Periodic Table; , and at least one element selected from group IIIb elements, and C is at least one element selected from oxygen, fluorine, sulfur, carbon, and nitrogen.) To explain in more detail, periodic table Ia Group elements include Lis Nas K, Rb, Cs, etc., and Ib
Group elements include CuSAg and Au. In addition, as the na group element of the periodic table, B e SM
g % Ca s S r SB a s and Ra, and the IIIb group element is Zn.

Examples include Cd. Group IIIb elements of the periodic table include 5CSY and La, a lanthanoid element.

Actinide elements such as Ce, Gd5Lu, etc., such as A
Examples include c5ThSPaSCf. In addition, ①a group elements include AJ, Ga, and In.

Examples include T.J.

Among the above elements, elements selected from group Ib elements, IIa
Preferably, a ceramic superconductor is made of an element selected from group elements, group ①a elements, and lanthanoid elements, as well as an element selected from oxygen and fluorine. Furthermore, Ib
Among the group elements, Cu is preferred.

In the superconducting power transmission line with the above configuration, the extremely brittle ceramic superconducting wire (3) is housed in the groove (2) of the reinforcing member (1) made of stainless steel, and the outer pipe (4) made of stainless steel Since the superconducting power transmission line as a whole is housed in the ceramic superconducting wire (3), it is possible to touch it or bend it without adversely affecting the ceramic superconducting wire (3).

Further, by increasing the lengths of the reinforcing member (1) and the outer pipe (4), a longer superconducting power transmission line can be obtained.

When the ceramic superconducting wire (3) is sintered, shrinkage occurs and a gap is created between it and the outer pipe (4), so necessary elements such as 02 can be supplied through this gap. (specifically, when the critical temperature is 115
It was. ), even if shrinkage occurs due to sintering, the ceramic superconducting wire (3) can be accommodated in the groove (2), so from this point of view as well, it is possible to achieve a remarkable lengthening. can.

Furthermore, in addition to the reinforcing member (1) being provided as described above, reinforcing wire (5) is twisted and wound around the outer circumference of the outer pipe (4), so the overall tension is high. Together with the appearance of the above-mentioned good superconducting properties and the achievement of long lengths, it can also be used as an overhead power transmission line that requires high tension.

FIG. 4 is a schematic perspective view showing another embodiment, and the only difference from the above embodiment is that a spiral groove (2) is formed on the outer periphery of the reinforcing member (1). .

Therefore, this embodiment also has the same effect as the embodiment shown in FIG.
2), the ceramic superconducting wire (3) and the reinforcing member (1) can be reliably integrated, and the superconducting power transmission line can be made even longer. can do. Moreover, ceramic superconducting wire (3
) and the outer pipe (4) to provide a sufficient supply of 02, it is possible to obtain a ceramic superconducting wire (3) with good superconducting properties. There are various effects that can be achieved.

Further, in terms of the manufacturing process, for example, it is only necessary to perform the twisting process before or after the wire drawing process, which has the effect of minimizing the complexity of the manufacturing process.

In addition, in the embodiments shown in FIGS. 1 and 4, the groove (2)
Three ceramic superconducting wires (
3), but the number of ceramic superconducting wires (3) can be increased to 4 (see Fig. 5) or more, about 10 or so, as necessary.
It is also possible to reduce the number to two or less.

Further, the reinforcing member and the outer pipe may be made of any material that does not react during heat treatment of the ceramic superconducting wire and has heat resistance to the heat treatment temperature, and examples thereof include stainless steel, Ag, and composite materials thereof. .

Furthermore, the present invention is not limited to the above-described embodiments; for example, by selecting raw materials for ceramic superconductors, it is possible to obtain a superconducting power transmission line having a desired critical temperature, and also to reduce the total length of the reinforcing member. In addition, it is possible to control the total length of the superconducting power transmission line obtained by controlling the length of the superconducting power transmission line, and furthermore, it is possible to obtain the superconducting power transmission line by heat-treating the stranded ceramic superconductor raw material. Various design changes can be made without changing the gist of the invention.

<Effects of the Invention> As described above, in this invention, a ceramic superconducting wire is housed in a longitudinally extending groove formed on the outer periphery of a long reinforcing member, and the whole is surrounded by an outer pipe. Therefore, in addition to exhibiting good superconducting properties, it is possible to eliminate brittleness as a whole, and
It is possible to achieve a remarkable lengthening, and furthermore, bending treatment and the like can be easily performed. Furthermore, in addition to the reinforcing member as mentioned above, the outer pipe is wrapped with reinforcing wires twisted together, so the whole can withstand high tension and has the above-mentioned good superconducting properties. Coupled with the emergence of cables and their lengthening, this has the unique effect of making it possible to realize overhead power transmission with low transmission losses.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the superconducting power transmission line of the present invention, FIG. 2 is a schematic perspective view of an outer pipe, FIG. 3 is a schematic diagram explaining the manufacturing process of the superconducting power transmission line, and FIG. The figure is a schematic perspective view of an outer pipe showing another embodiment, and FIG. 5 is a longitudinal analysis diagram showing still another embodiment. (1)...Reinforcement member, (2)...Groove, (3)...
Ceramic superconducting wire, (4)...outer pipe, 6)
···wire. Figure 3 ○ Wire drawing

Claims (1)

[Claims] 1. A longitudinally extending groove is formed around the elongated reinforcing member, and a ceramic superconducting wire is housed inside the groove, and the whole is surrounded by an outer pipe. A superconducting power transmission line, further comprising: a reinforcing wire material twisted and wound around the outer periphery of the outer pipe. 2. The superconducting power transmission line according to claim 1, wherein the groove is spirally formed around the reinforcing member. 3. The superconducting power transmission line according to claim 1, wherein a plurality of grooves are formed around the reinforcing member. 4. The superconducting power transmission line according to claim 1, wherein the ceramic superconducting wire has a composition represented by the following general formula (1). AaBbCc [I] (wherein A is at least one element selected from Group Ia elements, Group IIa elements, and Group IIIa elements of the Periodic Table; B is an element of Group Ib of the Periodic Table; Group IIb elements; elements, and
(C is at least one element selected from Group IIIb elements, and C is at least one element selected from oxygen, fluorine, sulfur, carbon, and nitrogen.) 5. The reinforcing member and the outer pipe are made of ceramic superconducting material. The superconducting power transmission line according to claim 1, which does not react during heat treatment of the wire and has heat resistance against heat treatment temperatures.