Superconducting cable wire (options)

 

(57) Abstract:

Use: for the manufacture of superconducting cable. The invention is: to get flexible oxide superconducting cable conductor, with smaller losses in alternating current, ribbon-like superconducting wire, each of which contains some number of cores consisting essentially of an oxide superconductor covered with a stabilizing metal wound spirally on a flexible frame. The superconducting wire is preferably wound on the armature when the bending stress is not greater than 0.3%. When winding on the frame a specified number of band-shaped superconducting wires wound on the core close to each other to form the first layer. Then, on this first layer is deposited insulating layer. The insulating layer (20) may be formed of insulating tape. A specified number of ribbon-like superconducting stranded wires wound on the insulating layer close to each other to form the second layer. The insulating layer can reduce losses wires with alternating current. If the frame consists essentially of metal, more preferably to do isol the ptx2">

This invention relates to a superconducting cable wire that uses an oxide superconductor, and, in particular, relates to a flexible wire that can be used in the superconducting cable.

Oxide superconductor, which becomes superconducting at the temperature of liquid nitrogen, is intended for use in the superconducting cable is cooled with liquid nitrogen. When making use of it is possible to simplify the system thermal protection and reduce cooling costs compared to metal superconducting cable, which currently requires expensive liquid helium.

Superconducting cables must be able to pass a high current at low energy loss in a compact wire. The energy transfer is usually carried out with alternating current, and the use of superconductors for AC inevitably accompanied by a loss of energy, commonly referred to as loss on alternating current. Loss of alternating current, for example, hysteresis loss, loss of connection or loss of eddy currents depend on the critical current density (jc) of the superconductor, the size of the veins, structures, wires, etc.

D is provodnikov to study structures to reduce losses in alternating current. For example, in Japanese patent publication N 6-36329 (1994) disclosed a superconducting wire, which contains the normal wire and stranded composite superconductors, is wound spirally on the outer circumference of the normal wire. Wire, disclosed in this publication is formed is wound clockwise and anticlockwise layers of stranded composite superconductors, which are alternately superimposed on each other. The direction of winding conductors change in each layer to reduce the magnetic fields generated by the conductors, so as to reduce the impedance and increase its current carrying capacity. This publication is also proposed to use between layers, the layer having a high resistance, or an insulating layer to reduce the loss of AC.

If the cable wire is formed of an oxide superconductor, the technology used for metal superconductor cannot be used as such. Oxide superconductor, for example, a ceramic superconductor, is more fragile and vulnerable in relation to mechanical stress than a metallic superconductor. For example, in Japanese patent publication N 6-36329 (1994) revealed equal to the diameter of each superconductor. However, if, for example, be wound with such a small step recently developed superconducting wire containing oxide superconductor covered with a silver shell, there is a high probability that this oxide superconductor to break, breaking the flow of current. If the oxide superconductor excessively bend, its critical current can be significantly reduced. Therefore, in the manufacture of cable wires, the important point is the location of the oxide superconductor.

Known superconducting cable wire on the basis of the oxides described in German patent N 4006094A, H 01 B 12/00, 1991.

Identified the closest analogues to the invention is a superconducting cable wire described in this application Germany N 4006094A, H 01 B 12/00, 1991.

The specified wire includes a flexible substrate (corrugated tube) for many stranded oxide superconducting wires, covered (one option) a stabilizing material.

The difference in question wires from the known is in the structures of the substrate, the oxide superconductor and of their mutual arrangement that allows you to break free from the above is not the d, having flexibility and excellent superconductivity, in particular, a high critical current and high critical current density flowing through the oxide superconductor.

Another problem that underlies this invention is to provide a superconducting cable wire, which significantly reduced the loss of alternating current flowing through the oxide superconducting wire.

According to this invention the substrate is in the form of a frame, a superconducting wire made ribbon and wound in a spiral on the frame in several consecutive, composed of a lot of these wires, layers close to each other in each of them, however, at least between these multiple layers is electrically insulating layer.

It is desirable that the superconducting wire were wound on the armature when the bending stress less than 0.3%

It is desirable that the insulating layer was located between multiple band-shaped superconducting wires, at least in any of the consecutive layers.

It is desirable that the frame was made of metal.

It is desirable that each e is a skeleton.

Preferably, each insulating layer was formed of insulating tape, and duct tape would be placed between adjacent band-shaped superconducting wires, at least, in any of a number of layers and spirally wound along the adjacent superconducting wires with the ability to cover the main surface facing the frame, one of the adjacent superconducting wires and one main surface of another superconducting wire opposite from the frame in pairs of opposite major surfaces of the respective wires.

Preferably, ribbon-like strands of the oxide superconducting wire were coated with insulating layers.

It is desirable that the frame was made of metal tube with a spiral groove or corrugated metal pipe.

It is desirable that the wire contained metal strip wound in a spiral on the frame, and insulating tape wound in a spiral on a smooth surface, formed by a metal ribbon, and ribbon-like superconducting wire helically wound insulating tape.

Preferably, Stacie fact, according to the invention the substrate is in the form of a frame, a superconducting wire made ribbon and wound in a spiral on the frame with the tension of not more than 2 FCT/mm2when the bending stress less than 0.3% in several consecutive, composed of a lot of these wires, layers close to each other in each of them, however, at least between these multiple layers and between the band-shaped superconducting wires and the frame is electrically insulating layer.

It is desirable that the wire contained insulating layer between multiple band-shaped superconducting wires, at least in any of the consecutive layers.

Preferably, each dielectric layer was formed by spiral winding the insulating tape in the longitudinal direction of the frame.

Preferably, each of the insulating layer was formed of insulating tape and insulating tape is placed between the adjacent band-shaped superconducting wires, at least, in any of a number of layers and was spirally wound along the adjacent superconducting wires with the ability to cover ground is to be another superconducting wire opposite from the frame in pairs of opposite major surfaces of the respective wires.

It is desirable that a number of ribbon-like strands of oxide superconducting wires, pre-coated with insulating layers, was tied to the frame.

It is desirable that the frame was metal tube spiral fluted or corrugated metal pipe.

It is desirable that the wire contained metal strip wound in a spiral on the frame, and insulating tape wound on a flat surface, formed by a metal ribbon, and ribbon-like strands of the oxide superconducting wire spiral was wrapped in insulation tape.

Preferably, the ribbon-like wire strands were twisted.

The above and other characteristics and advantages of this invention will become more apparent from the following detailed description of embodiments of the invention with reference to the accompanying drawings.

In Fig.1 provides a partial view of the core with helical grooves used in this invention; Fig.2 is a perspective view depicting a partially corrugated Sergei tape, used in this invention; Fig.4 General view of the ribbon-like strands of the oxide superconducting wire is wound spirally on the core; Fig.5 perspective view of a concrete example of the superconducting cable wire according to this invention; Fig.6 is a view in cross section depicting a multilayer structure lived and insulating material in the wire shown in Fig. 5; Fig.7 is a view in cross section depicting a specific example of such a structure in which an insulating tape is located between the adjacent band-shaped superconducting wires according to this invention; Fig. 8 is a perspective view depicting provisions lived intertwined stranded in the oxide superconducting wire of Fig.9 is a perspective view, depicting another form of the core; Fig.10 a,b in section, depicting the process of winding the superconducting stranded wires on the core without the spacer insulating layer; Fig.11 the relationship between the magnitude of losses in alternating current on one core and the exciting currents in the wires, obtained by stacking the superconducting stranded wires; Fig. 12 is a perspective view depicting another example of the proposed wire of the first wire; in Fig.15 a,b in section, depicting a superconducting multi-core wire covered with an insulating layer, and another example of the proposed wire made of superconducting stranded wires, respectively covered with insulating layers.

According to this invention, each ribbon-like strands of the oxide superconducting wire has, as a rule, such a structure, when the couple lived consisting essentially of an oxide superconductor immersed in a stabilizing material, such as silver or its alloy. The oxide superconductor may be made of oxide with yttrium, bismuth or thallium, such as,

J1Ba2Cu3O7-X(0X<1)2Sr2Ca2Cu3O10-Y(0Y<1) or

Tl2Sr2Ca2Cu3O10-Z(0Z<1).oC, preferably 840-850oC to the superconductor, sheathed, acquired a high degree of orientation and high critical current density. For the manufacture of stranded wire, a certain number of wires received after the drawing, is collected together and subjected to plastic processing and sintering. In the above process, you can get almost the superconducting monofase having a high degree of orientation, due to a combination of plastic processing and sintering. The ribbon-like strands of superconducting wire obtained by the above method, are almost homogeneous superconducting phase in the longitudinal direction of the tape wire, while the c-axis superconductive phase is oriented essentially parallel to the direction of thickness of the tape wire. Veins formed from Cree is United with each other. Flaky crystalline grain stacked in the thickness direction of the tape wire. This ribbon-like superconducting wire is practically unlimited in size, but has, for example, a width of 1.0 to 10 mm, preferably 2-6 mm, a thickness of 0.05-1 mm, preferably 0.1 to 0.4 mm When the size of the tape wire containing veins with the above structure, can save critical current density, for example, 4103-3,0104A/cm2. Tape the wire containing veins with the above-described structure has a relative resistance to bending and retains a high critical current density even when it is subjected to a particular bending stress, as will be described below. Ribbon-like superconducting wire can contain from 7 to 10000 lived, preferably 37-1000 lived.

In the proposed wire core, which is usually called a frame that can hold a ribbon-like superconducting wire under the bending stress in a given interval. This frame has a length required for a superconducting cable wire, and is located in the centre of the wire. The frame has an almost cylindrical or spiral shape, so that it can be of oblative the stand essentially of at least one material selected from the group comprising, for example, stainless steel, copper, aluminum and fiber reinforced plastic (FRP).

According to this invention the frame is preferably in the form of a tubular element having flexibility. For example, perhaps the preferred application of the tube with spiral groove (hereinafter referred to as spiral tube as frame having sufficient strength and flexibility (Fig. 1). Corrugated tube containing corrugations can also be preferably used as a frame, as shown in Fig.2. In Fig. 1 and 2 denote R1and R2denote, respectively, the outer diameters, T1and T2thickness, P1and P2- step and D1and D2the gaps. In addition, the frame may be made of twisted in a spiral of material, for example, so-called spiral steel strip shown in Fig.3. Any of these constructive executions are able to provide the frame with sufficient flexibility. Spiral tube or corrugated tube may also be made of stainless steel, copper, aluminum, or FRP. Flexible framework provides the flexibility offered wires. This flexible wire can be us the thousands of band-shaped superconducting wires. Tape wire wrapped around at least two or more layers, with their main surfaces facing toward the frame. Each layer may be formed of an arbitrary number of tape wires. When several tens of tape wires are wound on the frame parallel to each other, so that the surface of the frame filled with them, they wound several tens of tape wires. When the first layer is wound a sufficient number of tape wires in the second layer, they wound third layer of tape wires. Between each adjacent pair of layers is deposited insulating layer.

According to this invention, each ribbon-like strands of the oxide superconducting wire is wound on the frame, for example, as shown in Fig. 4. In Fig.4 tape the wire 11 is wound on a frame 10 having a given diameter, when the voltage of the bend or curvature in a given interval and step (P) of a given interval. The major surface 11a of the tape wire 11 facing toward the frame 10. Therefore, relatively free bending is applied to the tape wire 11 in the longitudinal direction. If the bending stress is determined in accordance with PR is not more than 0.5%, preferably, not more than 0.3% Superconductivity tape wire 11 is unlikely to deteriorate at such bending stress compared with superconductivity in the straight condition.

The bending stress (% ) (thickness of the ribbon-like superconducting wire/(curve diameter + thickness)) 100.

When the band-shaped superconducting wire thickness t is spirally wound on the frame, having a diameter D, pitch P, the bending stress E receive according to the following equation. According to this invention, it is preferable to set the step P and the diameter D of the frame, so that the bending stress E was not more than 0.3%

E t100/(D1+t)

D1= (P2+(D)2)4/

According to this invention, each ribbon-like oxide superconducting wire is preferably wound on the frame with the tension of not more than 2 kg/m, for example in the range of 0.5-2 kg/m.

Core (frame) can be performed by either of insulating material or of the electrical conductor. Insulating material is preferable from the viewpoint of reduction of losses in alternating current, while the metal, which is an electrical conductor, is preferable from the viewpoint of strength. Metallic the core to make the wire flexibility while maintaining its strength. The metal core can also be used to transmit the abnormal current after the accident. In this case, it is possible to set the optimum resistance of the core from the point of view of loss of alternating current in the wire and the load of the core for this anomalous current.

If the core uses a metal tube spiral fluted or corrugated metal tube, the proposed wire may also contain a metal tape which is wound on the core in a spiral, and an insulating tape wound in a spiral on a flat surface formed by a metal band. Metal tape can form a smooth surface for covering the grooves of the core so that the superconducting tape is not showing through due to these grooves, and for the reception of superconducting tapes. It is possible to close the groove, while maintaining the flexibility of the core by winding a metal ribbon. Insulating tape, which is wound on the metal strip, prevents electrical connection between the core metal ribbon and superconducting tapes. Duct tape can be replaced insulating layer consisting essentially of a different material. ¾ Tape.

According to this invention, the insulating layer is performed at least between the layers, each of which is formed of several superconducting tapes. In addition, you can also enter insulating layer located between several closely ribbon-like superconducting wires in at least any of the number of layers. If the core consists essentially of metal, as described above, the insulating layer preferably also be performed between the core and the ribbon shaped superconducting wires. Alternatively, the core may be wound a number of band-shaped superconducting wires, pre-coated with an insulating layer. According to this invention the insulating layer prevents electrical connection between the superconducting tapes, thereby reducing loss of the wire on the AC.

In Fig. 5 and 6 shows a typical insulation between layers and the insulation between the superconducting wires in the layers. Insulation materials 50 are located respectively between the superconducting conductors 51. The interlayer insulating layer 60 is located between the first and second layers 61 and 62, which formed the traditional material 50 is formed chloroarsine or ribbon-like elements, which is spirally wound on the core 55. The interlayer insulating layer 60 and the insulating layer 65 may be formed from a wide ribbon-like or prosobranch elements. These materials are wound in a spiral on the conductor 51.

According to this invention, the materials, the insulating cores preferably have the shape of a ribbon-like or sharoobraznymi elements, to retain the flexibility of the core and to obtain a superconducting cable wire the flexibility you need. Therefore, the insulating layer is also preferably formed of ribbon-like or sharoobraznymi elements. Thus it is possible to form the insulating layer by spiral winding an insulating tape or an insulating cord in the longitudinal direction of the core. Insulating tape or cord may be wound under tension, for example, 0.5-2 kg/m.

To create insulating layer located between several closely superconducting tapes of each layer can be used, for example, the superconducting tape, previously completely covered with insulation. However, relatively difficult to satisfactorily cover the insulation surface flat belts, especially at their edges, and this dragostine electrical connection. If between superconducting tapes laid closely to each other in one layer has a dielectric layer, then it is preferable to dispose an insulating tape, as shown in Fig.7. In Fig.7, each of the insulating tape 70 is located between adjacent superconducting strips 71 and 71'. Insulating tape 70 is wound in a spiral along the superconducting strips 71 and 71' to cover one main surface 71a of the superconducting tape 71, and one main surface 71'b superconducting tape 71'. In other words, the insulating tape 70 covers the main surface 71a of the superconducting tape 71, which is closer to the core, and the main surface of another superconducting tape 71', which is located opposite the core in pairs of opposite main surfaces (surfaces 71a and 71b of the tape 71 and the surface 71'a and 71'b tape 71'), respectively, of the strips 71 and 71'. Due to this layout is one of the superconducting tapes are completely isolated from each other, resolving the above mentioned problem of edge parts. In addition, you can also isolate the layers from each other by winding an insulating tape as described above.

The insulating layer may be made of insulating melena (PE) or craftool paper, when this insulating material preferably should not have disadvantages such as cracking in liquid nitrogen. Insulating material for the formation of the insulating layer is used in the form of paper, sheet, film, fabric or tape. The preferred thickness of the insulating layer should not be more than 0.1 mm in order to ensure compactness of the wire. On the other hand, an insulating layer that was previously formed on each of the superconducting tape is, for example, preferably essentially enamel.

According to this invention can be used ribbon stranded wire with twisted (testirovanie) conductors. In Fig.8 shows such a superconducting wire. This figure vein 2 forming the superconducting stranded wire 1 twisted, for example, with a given step L. due to such twisting lived 2 induction current passing between the stabilizing metal conductors 3 and 2 splits in each winding pitch L on a small loop, and, therefore, the value of this current is limited. Thus, suppress the Joule heat in stabilizing the metal 3 and reduces the loss of alternating current in comparison with the superconducting wire, the cords of which is that the number of single core wires, veins which are made of an oxide superconductor, are enclosed in a metal tube and the metal tube is pulled into the wire. Then this wire is twisted in a state of round wire to form a twisted core. After that, the wire is again pulled, and then rolled and thermoablative. Due to such operations, the diameter and thickness lived change during drawing, rolling, etc., and their twisted form is saved. In torsion, wire drawing and rolling of the winding pitch is preferably set at a level exceeding more than five times and preferably ten times, the diameter of the twisted wire so that the wire is not divided.

Superconducting cable conductor according to this invention has such flexibility, which practically does not deteriorate even when it is bent with a diameter of bending up to 1.5 m, preferably 2,6 m This wire can gather around the drum for storage and transport.

According to this invention can be obtained a long oxide superconducting cable conductor having not only flexibility, but also an excellent superconductivity. In this invention, eddy current or the current connection passed what rutenium. Due to this insulating layer can reduce losses veins with alternating current at least an order of magnitude. According to this invention proposes another wire for practical application in superconducting cable for alternating current.

The following is a detailed description of the present invention.

Research bending stresses in superconducting tape wound on the frame.

Oxides or carbonates were mixed in the following ratio of Bi, Pb, Sr, Ca and Cu in composition: 1,84:0,36:1,99:2,18:3,00. This mixed powder was subjected to heat treatment to obtain a powder containing 85% 2212 phase and 15% of the 2223 phase as the superconducting phase, at the same time keeping mainly (Ca1Sr)2PbO4and Ca2CuO3as a non-superconducting phases. The thus treated powder was loaded into a silver tube with an external diameter of 12 mm and an inner diameter of 9 mm, this silver tube pulled up to a diameter of 1.3 mm, a Specific number of leads, thus obtained, was placed in a silver pipe of a given size, this silver tube pulled up to a diameter of 1.0 mm wire Obtained was subjected to heat treatment at 845oC for 55 h, and then rolled under the hood to 15% of P is of the manual was obtained six kinds of band-shaped superconducting wire shown in the table.1. Critical current density (Jc) of these tape wires was measured in liquid nitrogen, when the tape wire was in the straight condition and when they were bent with predetermined diameters of bend. In table.2 shows the values of the critical current density Jc, which were measured for five bending stresses. As can be seen from the table. 1 and 2, the reduction in critical current density Jc of the wire to which it was applied bending stress decreases with decreasing percentage of the thickness of the superconductor from the thickness of the wire. This percentage is preferably not more than 10% on the other hand, each wire preferably contains at least 37 lived. In the superconducting wire containing at least 61 vein, the critical current density Jc is not reduced significantly when bending 0.5% Clear that it is possible in practice to withstand bending superconducting wire obtained according to the above-mentioned method, when the bending stress is not more than 0.5%, preferably not more than 0.3%

The change in losses on alternating current.

Bi2O3, PbO, SrCO3, CaCO3and CuO were mixed to obtain a composition containing Bi, Pb, Sr, Ca and Cu in the ratio 1,81:0,40:1,98:2,21:3,03. Paremesan is OK obtained after heat treatment and grinding again crushed in a ball mill to obtain a powder of a submicron level. This powder was subjected to heat treatment at 800oC for 2 h and were loaded into a silver tube with an external diameter of 12 mm and an inner diameter of 9 mm

Silver tube with powder pulled and cut several wires, which are then placed into another silver tube with an external diameter of 12 mm and an inner diameter of 9 mm, to produce a multi-wire, containing 61 vein. This multi-wire again subjected to drawing, rolled to a width of 3.0 mm and a thickness of 0.22 mm, and then subjected to heat treatment. After this wire is rolled to a thickness of 0.20 mm and again thermoablative, thus obtaining covered with silver superconducting wire of the oxide of bismuth containing 61 vein.

Then the steel with a thickness of 0.33 mm and a width of 10 mm was wound in a spiral to obtain a frame with an outer diameter R of 19 mm, step twist L 4 mm and a gap D of 2 mm, as shown in Fig.9.

Obtained as described above 20 band-shaped superconducting wires were wound in a spiral on the frame closely is igure superconducting stranded wire 11 is wound on the frame 10 close to each other. The obtained single-layer wire had a critical current (IC) 550 A.

After that 22 of the superconducting stranded wire was wound in a spiral on a single-layer wire close to each other when the winding pitch of 250 mm, in the direction opposite to the direction of winding of the first layer. In Fig. 10(b) shows a view in cross section of the obtained two-layer wire. Superconducting stranded wire 11' was tied next to the superconducting wire 11 wound on the frame 10. The critical current IC obtained two-layer wire was 850 A.

This wire losses on alternating current was measured in the condition of the single-layer wire containing 20 lived, and double-layer wire containing 42 veins. In Fig.figure 11 shows the dependence between losses on alternating current on one core and the excitation currents for the respective cases. The same figure also shows the dependence between losses on alternating current and the excitation current in each wire having a critical current IC value of 20 a, which was measured before the manufacture of the wire. In Fig.11 black circles, white circles and black triangles, respectively show the measured values for each core, odnosno what about the current almost identical to the same characteristics uncollected veins. A two-wire, on the one hand, the loss of the alternating current on one core was increased compared with losses in a separate vein. This experiment proved that a single layer of wire has less loss at AC than layered. It was assumed that this is due to the formation of the eddy current or the current connection is transmitted and passes through the layers, which is not in a single-layer wire. To test this hypothesis were made superconductors, provided with insulating material between the layers to cut down on the electric conductivity, so as to reduce loss of alternating current in the multilayer wires.

Example 1

20 stranded wire obtained as described above was wound on the frame of the spiral tube with an outer diameter of 19 mm and a thickness of 0.3 mm with a gap of 2 mm with a pitch of 4 mm, as shown in Fig.1, close to each other. These wires were wound with a pitch of 250 mm, Then an insulating material made of paper PPLP thickness of 140 μm and a width of 30 mm spiral was wound round stranded wire in a single layer in increments of 40 mm and a gap of 0.5 mm After 22 strands identical to those described you is Locke.

In Fig. 12 and 13 shows the wire. In the resulting two-layer conductor wire 11 is wound on the frame 10 against each other for the formation of the first layer, as shown in Fig.12 and 13. The insulating layer 20 made of paper PPLP is available on the superconducting stranded wires 11, while the superconducting stranded wire 11' wound next to each other to form the second layer. Obtained in this way, the wire had a critical current IC 850 A. the wire to the loss of AC were reduced approximately by one order as compared with the two-layer wire, made without the insulating layer. From the point of view of loss of AC on one core, the losses in the wire has reached the level of the individual losses from uncollected veins. Due to the above experiment, it was proved that the presence of the insulating layer between layers of a multilayer wire has a favorable effect on reducing the loss of AC.

Although the above example is described with reference to the two-layer wire, it is possible to obtain effect of the use of the insulating layer with the superconducting stranded wires, superimposed on each other in three or more layers. For example, as shown the and by sequentially stacking the first layer of the superconducting stranded wires 31, the insulating layer 32, the second layer of the superconducting stranded wires 33, the insulating layer 34, the third layer of the superconducting stranded wires 35, the insulating layer 36 and the fourth layer of the superconducting stranded wires 37.

It is also possible to cover the surface of the superconducting stranded wires with insulating layers for winding these wires on the frame. For example, a superconducting multi-core wire 41 is covered with an insulating layer 40, as shown in Fig.15A. You can wrap a number of such superconducting stranded wires 41 on the frame 56, as shown in Fig.15B. Although this design require a lot of time for coating and high costs compared with a case when the insulation material is laid between the layers, in this case the result is more reliable insulation.

Example 2

Bi2O3, PbO, SrCO3, CaCO3and CuO were mixed to obtain a composition containing Bi, Pb, Sr, Ca and Cu in the ratio 1,81:0,30:1,92:2,01:3,03. The mixed powder was subjected to heat treatment several times by crushing after each heat treatment. The powder obtained after heat treatment and grinding again ismelda is at 800oC for 2 h and were loaded into a silver tube with an external diameter of 12 mm and an inner diameter of 9 mm Silver tube with powder pulled and cut several wires, which are then placed in another silver tube with an external diameter of 12 mm and an inner diameter of 9 mm, to prepare a multi-strand wire, containing 61 vein. This stranded wire again subjected to drawing, rolled to a width of 3.0 mm and a thickness of 0.22 mm, and then subjected to heat treatment. After this wire is rolled to a thickness of 0.20 mm and again subjected to heat treatment, thus obtaining covered with silver superconducting wire of the oxide of bismuth containing 61 vein. This wire was specaly and was cut into samples of 1 m length, which was measured by the critical value DC. It was confirmed that 100 samples had stable critical current value 231A.

These wires were made of wire of length 1 m and investigated their characteristics AC. Superconducting wire, each of which contained 61 core, wound in a spiral on the frames of FRP length of 1 m and an outer diameter of 19 mm close to each other, to obtain two kinds of single-layer wires A and B. Aational material between them. The wire 17 B superconducting wires assembled together with a gasket between them coroorate insulator diameter of 0.5 mm, which was obtained by twisting craftool paper, so he could serve as a gasket, and was wound in a spiral.

These wires were measured loss with alternating current in liquid nitrogen at a temperature of about 77 K at the place of excitation, and each value loss on alternating current was determined as the product of the excitation current and voltage components that are in phase with the current. Every excitation current and the magnitude of losses divided by the number of used lived to calculate the loss of alternating current for single wires. It was confirmed that the loss of alternating current in A wire were almost twice higher than the losses in the wire B when the current passing through each vein, was not above 23 A. This experiment confirmed the efficiency of electrical insulation superconducting wires forming the same layer from each other to reduce losses in alternating current.

Example 3

For the manufacture of wire for the study of its characteristics AC used a wire of length 1 m, is identical to the wire in example 2.

Stranded sverkhprovod, to obtain a single-layer wire C. the wire was wound with a pitch of 250 mm 20 wires were collected close to each other without gaskets between the insulation material. Loss of AC cables C was measured in liquid nitrogen. Loss of alternating current on one core was determined as in example 2, and it was confirmed that the loss in the wire C were 2-5 times higher than the losses in the wire B when the excitation current in the veins is not above 23 A. This experiment, it was confirmed that the loss of alternating current in the wire increases, if the core is made of metal and superconducting wire are in contact with him.

Example 4

For the manufacture of wire for the study of its characteristics AC used a wire of length 1 m, is identical to the wire in example 2.

Superconducting wire was wound on an aluminum spiral tube, the shape of which is similar to the form shown in Fig.1, a length of 1 m with an outer diameter of 28 mm, close to each other, to obtain two kinds of single-layer wires D and E. the Superconducting wire was wound with a pitch of 250 mm 20 wires collected on each spiral tube with a gasket between the cores craftool paper casinoenligne superconducting wire was tied in a spiral in a single layer. In another wire E copper tape was wound in a spiral on the aluminum tube, and then the tape Zumirror (based on the polyester) of a thickness of 0.1 mm was wound in a spiral on top for electrical insulation. Superconducting wire was wound in a spiral on this insulating tape in a single layer.

For each of the wires D and E loss of alternating current on one conductor wire was measured in liquid nitrogen, and it was confirmed that the loss in the wire D in 5 -10 times the loss in the wire E at a current of not more than 23 A. This experiment has proved possible to reduce the loss of alternating current by the location of the insulation material on the surface of the core to build on its superconducting wires, if this core is made from metal.

Example 5

Bi2O3, PbO, SrCO3, CaCO3and CuO were mixed to obtain a composition containing Bi, Pb, Sr, Ca and Cu in the ratio 1,81:0,30:1,92:2,01:3,03. The mixed powder was subjected to heat treatment several times by crushing after each heat treatment. The powder obtained after heat treatment and grinding again crushed in a ball mill to obtain a powder of a submicron level. This powder was subjected to heat treatment at rebreanu tube with powder pulled and cut several wires, which are then placed into another silver tube with an external diameter of 12 mm and an inner diameter of 9 mm, to produce a stranded wire, containing 61 vein. This stranded wire again subjected to drawing, rolled to a width of 3.0 mm and a thickness of 0.22 mm, and then subjected to heat treatment. After this wire is rolled to a thickness of 0.20 mm and again thermoablative, thus obtaining covered with silver superconducting wire of the oxide of bismuth containing 61 vein. This wire was specaly and cut on 200 samples of 1 m length, which was measured by the critical value DC. It was confirmed that 200 samples had stable critical current value 232A.

A wire of length 1 m is used to get the wires for the study of AC characteristics. Superconducting wire, each of which contained 61 core, wound in a spiral on the frames of FRP length of 1 m and an outer diameter of 19 mm close to each other in two layers, to obtain five types of two-layer wires F, G, H, I and J. These wires were wound with a pitch of 500 mm

In the first wire F between adjacent superconducting wires, assembled on the frame is between the first and second layers. 40 wires were tightly wound on the frame in two layers.

The second wire G of the insulation material was not between the wires forming the first and second layer. But between the first and second layer was wound in a spiral paper PPLP width of 30 mm and a thickness of 0.17 mm to isolate these layers from each other. 40 superconducting wire was wound on a frame in two layers.

In the third wire H strips of Kapton etc (based on polyimide) having a width of 0.5 mm and thickness of 0.2 mm were sandwiched between superconducting layers as strip during the formation of the first and second layer. In addition, wound in a spiral strip of Kapton etc width of 30 mm and a thickness of 0.2 mm was placed between the first and second layers.

In the fourth wire I tape Zumirror (based on the polyester) width of 5 mm and a thickness of 0.02 mm was laid between adjacent stranded wires in the first or second layer. This tape Zumirror was located between adjacent superconducting wires, as shown in Fig.7. In other words, the tape Zumirror was tied in a spiral along the superconducting tape to cover the upper part of one of the adjacent superconducting tapes at the same time covering the lower part of the other sorpresa the Noah ribbon between them.

In the fifth wire J superconducting wire pre-coated with enamel, gathered together, and between adjacent superconducting wires in the first and second layers, respectively, were laid strips of Kapton etc width of 3 mm and a thickness of 0.02 mm These insulation tapes were located between the superconducting wire similar to the wire 1.

Loss of alternating current was measured for each of the wires F-J in liquid nitrogen at a temperature of approximately 77 K according to the method of excitation. Loss of alternating current was determined as the product of the excitation current and voltage, which was in phase with the current. Each value of the excitation current and losses divided by the number of used lived to calculate the loss of AC is based on one core. When the supply current value 20 A onto the line, wire F, G, H, I and J showed a loss of AC in size 7; 1; 0,7; of 0.7 and 0.7 mW/m, respectively. In areas of no higher than 25 And the wires F and G showed, respectively, the maximum and next maximum loss. On the other hand, in the wires H, I and J loss of alternating current remained almost the same level in all areas, indicating reduced poter between the layers in the layer. More specifically, the structure of the wires H, I and J were the most effective.

Although this invention has been described in detail and illustrated, it should be understood that this is done solely as an illustration and example and should not be taken as limiting, as the purpose and scope of the present invention is limited only by the attached claims.

1. Superconducting cable wire using an oxide superconductor containing a flexible substrate for many stranded oxide superconducting wire covered with a stabilizing material, wherein the substrate is in the form of a frame, a superconducting wire made ribbon and wound in a spiral on the frame in several consecutive, composed of a lot of these wire layers close to each other in each of them, at least between these multiple layers is electrically insulating layer.

2. Wire under item 1, wherein the superconducting wire is wound on the frame when the bending stress less than 0.3%

3. The wire on the PP.1 and 2, characterized in that the insulating layer is located between many lentor. the wires on the PP.1 to 3, characterized in that the frame is made from metal.

5. The wire on the PP.1 to 4, characterized in that each insulating layer is formed by spiral winding the insulating tape in the longitudinal direction of the frame.

6. Wire under item 3, wherein each insulating layer is formed of an insulating tape, and duct tape placed between adjacent band-shaped superconducting wires at least in any of a number of layers and spirally wound along the adjacent superconducting wires with the ability to cover the main surface facing the frame, one of the adjacent superconducting wires and one main surface of another superconducting wire opposite from the frame in pairs of opposite major surfaces of the respective wires.

7. Wire according to any one of paragraphs.1 to 4, characterized in that the ribbon-like strands of the oxide superconducting wire covered with insulating layers.

8. Wire according to any one of paragraphs.1 to 7, characterized in that the frame is made from metal tube spiral fluted or corrugated metal pipe.

9. Wire under item 8, ulanow in a spiral on a smooth surface, formed metal ribbon, and ribbon-like superconducting wire helically wound insulating tape.

10. Wire according to any one of paragraphs.1 to 9, characterized in that the ribbon-like wire strands twisted together (testirovanie).

11. Superconducting cable wire using an oxide superconductor containing a flexible substrate for many stranded oxide superconducting wire covered with a stabilizing material, wherein the substrate is in the form of a frame, a superconducting wire made ribbon and wound in a spiral on the frame with the tension of not more than 2 FCT/mm2when the bending stress less than 0.3% in several consecutive, composed of a lot of these wire layers close to each other in each of them, at least between these multiple layers and between the band-shaped superconducting wires and the frame is electrically insulating layer.

12. The wire on p. 11, characterized in that it contains insulating layer between multiple band-shaped superconducting wires at least in any of the consecutive layers.

the individual winding insulating tape in the longitudinal direction of the frame.

14. The wire on p. 11, wherein each insulating layer is formed of an insulating tape, and duct tape is placed between the adjacent band-shaped superconducting wires at least in any of a number of layers and spirally wound along the adjacent superconducting wires with the ability to cover the main surface facing the frame, one of the adjacent superconducting wires and one main surface of another superconducting wire opposite from the frame in pairs of opposite major surfaces of the respective wires.

15. Wire according to any one of paragraphs.11 to 14, characterized in that the ribbon-like many stranded oxide superconducting wires, pre-coated with an insulating layer, wound on the frame.

16. Wire according to any one of paragraphs.11 to 15, characterized in that the frame is metal tube with spiral fluted or corrugated metal pipe.

17. Wire under item 16, characterized in that it contains the metal strip wound in a spiral on the frame, and insulating tape wound on a flat surface, formed by a metal ribbon, and the ribbon-like mod according to any one of paragraphs.11 17, characterized in that the ribbon-like wire strands twisted.

 

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