High voltage isolation system

FIELD: engineering of high voltage isolation system, useable at low temperature.

SUBSTANCE: high voltage isolation system aside from cooling liquid 3 contains solid isolator 2 on basis of cellulose base fabric 20. Solid isolator 2 is utilized primarily in form of pressed sheets and saturated with polymer resin. At 77K it has high field strength with partial discharges, and also its thermal expansion coefficient is optimally matched with thermal expansion coefficient of ceramic high temperature superconductors. Pressed sheets may be deformed in dry state, in particular, as frames for coils, or as an alternative may be composed with cotton fabrics into laminates of arbitrary thickness. Into base fabric or intermediate layer it is possible to add: carbon in form of filaments or fabrics, glass filaments in form of filaments or fabrics. Method for manufacturing system for high voltage insulation of electric conductors includes deforming base fabric in dry state, saturating it with polymer resin and dipping solid isolator into cooling means. Deformed pressed sheet forms a frame of coil, onto which at least one winding of superconductor is wound, then the frame and winding are saturated jointly.

EFFECT: increased efficiency.

2 cl, 3 dwg

 

The invention relates to high-voltage insulation. It concerns the system of high-voltage electrical insulation of electrical conductors according to the restrictive part of claim 1 of the formula and method of its manufacture according to the restrictive part of item 8 of the formula.

For use in the field of power supply system voltage up to 550 kV electric structural elements or components, in the form of electrical conductors, designed for appropriate use at operating temperatures below room temperature, is required suitable for low temperature system high-voltage insulation. This often uses a combination of the cooling medium and the solid insulator. If the prescribed operating temperature is low enough, the chemical aging processes as mechanisms of degradation of solid insulator almost disappear. On the other hand, due to the difference between the temperature of preparation and use in insulating material occur thermally caused stresses that while rapid cooling and heating can cause damage, such as cracks or delamination. If electric structural elements or components are in direct electrical contact with the solid insulator, thermal expansion coefficient of the insulator does not have the same too much different from the coefficient of thermal expansion of the components, in the form of electrical conductors, in order to avoid stresses in it.

Of particular interest are the electrical structural elements and components, in the form of electrical conductors, on the basis of high-temperature superconductors, such as cables, transformers, tomographically etc. For cooling high-temperature superconductors up to operating temperatures below 80K preferably using liquid nitrogen (LN2).

Applied solid insulator must have in most cases also a certain mechanical stability and to be able to act as a support or stabilizer, for example, for components made of ceramic high temperature superconducting material, in the form of electrical conductors. In these circumstances, the isolation of the polymer film or Kraft paper is not considered. Mechanically loaded components in isolation usually made of reinforced glass fiber composite materials. The latter contain a polymer matrix of a rejected epoxy resin and glass or carbon fiber reinforced material basis. Containing fiberglass composite materials have, however, at 77 K small field strength with partial discharge (partial discharge inception field) ≈1 kV/mm, and even with the use of special methods p is Opieki under pressure in the vacuum casting resin is achieved in the best case ≈ 4 kV/mm, Respectively, in order to avoid too high a field strength insulation should not be less than a certain minimum thickness, which is contrary to the aspirations regarding compact size.

For isolation transformers often find the use made of cellulose pressed sheets, common, for example, under the name "Transformerboard". They have a thickness of from 0.5 mm to several mm, and laminated and glued kinds to 100 mm and more. In the US 3710293 system disclosed isolation layer extruded sheets and Kraft paper, which is filled thermoplastic resin. As an alternative to oil-cooled transformers as barriers between adjacent winding layers use oil-impregnated solid insulator of pulp and paper. First of all you have to dry them heating-vacuum method. This should prevent the return of cellulosic material water oil and the deterioration of its dielectric properties.

The present invention is the creation of a system of high-voltage insulation of electrical conductors for use at temperatures below room temperature at high field strength with partial discharges, as well as the development of the method of its manufacture.

These problems can be solved through a system of high-voltage insulation to submit the kami claim 1 of the formula and method with the characteristics of claim 8 of the formula.

The essence of the invention is the use of electrically insulating coolant in combination with a solid insulator in the form of a composite material comprising impregnated with a polymer resin cellulosic fiber. The increased field strength with partial discharges polymer composite provides a more compact system high-voltage insulation, thereby reducing costs.

According to the first preferred form of execution as a cooling means used liquid nitrogen LN2·LN2suitable for cooling of high-temperature superconductors operating temperature, 77 K and below. In the range between room and operating temperatures average coefficient of thermal expansion of the composite of cellulose and the polymer matrix is comparable with the average coefficient of thermal expansion of high-temperature superconductors. Due to this, it becomes possible to produce cellulose composite in the immediate and durable mechanical contact without fear of damage caused by stresses during cooling or heating.

For mechanical protection of high-temperature superconducting ceramics solid insulator cellulose is used preferably in the form of pressed leaves. To achieve higher swelling and increases the authorized mechanical stability can be laminated with a few thin, deformable separately sheets. The intermediate layer of suitable fabric absorbs excess polymer resin and prevents the formation of pure resin layer between the pressed sheets.

The method according to the invention, for the manufacture suitable for low temperature systems high-voltage insulation differs in that fresh leaves in the dry state is deformed, and then impregnorium, i.e. impregnated with a polymer resin. Because deformation of the pressed sheets not moisturize, and there is no need for subsequent impregnation, thorough drying. Due to this possible danger of unwanted wrinkling strain extruded sheet during drying.

According to another form of execution of the extruded sheet is formed into a cylindrical coil and wound on him superconducting wire. After that, the frame and the winding fill together with polymer resin, resulting in the coil is glued to the frame and mechanically fixed.

A preferred form of execution shown in the dependent claims.

The invention is explained in more detail below using examples of how to perform in connection with the drawings, which depict:

- tiga: the fragment system high-voltage insulation, according to the invention;

- fig.1b: incision device with electrocorundum, who according to the invention, conductor;

- figure 2: coil frame as part of a system of high-voltage insulation, according to a preferred form of execution of the invention.

Used in the drawings, the reference position is given in the list. In principle, the same parts are denoted by the same reference position.

On figa depicts a high-voltage insulation system according to the invention, together with having a high electric potential of the conductor 1. The conductor 1 is part of the structural element, which acts under the principle of action must be cooled to the working temperature below ambient or room temperature (20-25°). The high-voltage insulation system includes a solid insulator 2 and the fluid, i.e. liquid or gaseous coolant 3. Solid insulator 2 is made of fabric-the basics 20 and the polymer matrix 21. Matrix systems are predominantly three-dimensional crosslinked thermosets, and they are based on, for example, hardened epoxy, silicone or polyester resins. According to the invention, the fabric base 20 includes fiber from pulp processed cellulose).

On fig.1b shows the device with the conductor 1 as an integral part of the cooled electric component, through which the lead wires 4 connect is replaced with the mains supply (not shown). The conductor 1 is surrounded by a solid insulator 2, according to the invention, and immersed in the cooling liquid 3. The latter is in thermal insulating capacity 5.

In accordance with the prior art in relation to the achieved mechanical properties of the used glass fiber, which is impregnated with a polymer resin. The reason for the above-mentioned "modest" field strength with partial discharges less than 4 kV/mm at-impregnated glass fibers is necessary in the coating of glass fibers, which prevents complete wetting of the fibers by the resin. Because of this, are formed microscopically small cavity on the fibers, in which partial discharges occur, which again leads to accelerated aging of glass-fiber insulation. In contrast, using impregnated with a polymer resin of cellulose at a temperature of 77 K field strength is achieved with partial discharges up to 10 kV/mm, since the cellulose fibers better get soaked and not formed in the cavity.

The conductor 1 is, for example, high-temperature superconductor and as such part is used to transfer energy structural element (the transmitting cable, transformer or current limiter). Depicted in figure 1, the flat geometry of the conductor in any case is not required, the conductor 1 may be the ü also suitably curved or have the shape of a wire, perhaps in interaction with the normally conductive matrix. It is also possible to use substrates or normally conductive shunt layers. The critical temperature known high-temperature superconducting materials is above 80K, so liquid nitrogen LN2as the coolant with a boiling point of 77 K at normal pressure provides the use of such high-temperature superconductors.

The coefficient of thermal expansion of the ceramic superconductor is usually about 10·10-6/To and along the surface of the impregnated polymer resin pulp tissue within 6-13·10-6/K. the Coefficients of thermal expansion differ, therefore, as little from each other that when cooled to the working temperature of cellulose composite and high temperature superconductor is compressed equally. If both were pre-glued at ambient temperature, for example by the named polymer resin, mechanical composition, does not occur, thus, thermomechanical stresses.

Cellulose is available, including molded in the form of sheets ≈1.2 g/cm3. Such sheets may be impregnated with suitable methods of polymer resins of low viscosity. This leaves should be seeing is Ino well dried up. Similarly, the filled sheets can perform the basic function and due to the similar coefficients of thermal expansion to stabilize adjacent adjacent superconductors.

Individual sheets of small thickness can be somewhat deformed, and this usually occurs in the wetted state. The problem with this is that in the process of drying the deformed sheet again changes its geometry, i.e. a certain instability forms. When dry deformation impossible arbitrarily small radius of curvature, when the sheet thickness of 1 mm is achievable radius of curvature, comprising at least 15 see Deformed or separate flat sheets can be combined into a laminate, and then soaked.

For this purpose it is preferable to provide, between the individual sheets of the intermediate layer, because otherwise between the sheets accumulate excess resin as a thin, pure resin layer of a thickness of <50 μm. When cooled, it causes a tendency to delamination of the laminate. As the material of the intermediate layer is suitable, for example, cotton, aramid or polyethylene fibers.

Figure 2 schematically shows a superconducting coil having a semi-cylindrical shape of the frame 6 of a composite material with two layers 60, 61, molded separately in a tube and see the major intermediate layer 62. The frame 6 is wound superconducting wire. The inner space of the frame 6 and surrounding the coil outer space is filled with cooling means (not shown). In the manufacture of coils, it is preferable to carry out the impregnation process, i.e. the shading coil, only after winding the wire because this wire is additionally fixed on the frame 6.

Because of the high-voltage components, in the form of electrical conductors, inevitably raises the problem of amplification of the electric field at the edges, glands and the like, it is preferable to make the insulation system and, in particular, the solid insulator certain that govern the property field. To this end, the polymer resin is added in the form of a powder material with a high dielectric constant, such as soot (carbon black), or provide it in the form of fabric as part of the intermediate layer. This gives the composite semi-conducting properties. Also for geometric control field as part of the intermediate layer can be applied aluminum foil.

If you need additional mechanical reinforcement, it can be applied to glass fibers or polymeric matrix, either in the form of fiberglass canvas in the intermediate layer. This, of course, only where there is a strong electric fields, and there is no fear of partial discharges.

Thistime high-voltage insulation of electrical conductors, containing solid insulator (2) with utverzhdenii polymer matrix (21) and tissue-based (20), which includes cellulose, characterized in that it contains cooling means (3), the solid insulator (2) is immersed in the cooling means (3).

2. The system according to claim 1, characterized in that the cooling means (3) contains liquid nitrogen, and the electrical conductors contain high-temperature superconducting material.

3. The system according to claim 1, characterized in that for the mechanical stabilization of electrical conductors fabric-base (20) is made in the form of pressed leaves.

4. The system according to claim 3, characterized in that the fabric-base laminate contains (6), at least two layers (60,61) of the pressed sheets separated from each other, at least one intermediate layer (62).

5. The system according to claim 4, characterized in that the intermediate layer (62) contains cotton fabric, aramid or polyethylene fibers.

6. The system according to claim 1 or 4, wherein the tissue-based (20) or the intermediate layer (62) added carbon in the form of fibres or textiles.

7. The system according to claim 1 or 4, characterized in that the mechanical reinforcement to the tissue-based (20) or the intermediate layer (62) added glass fibers in the form of fibres or textiles.

8. A method of manufacturing systems high-voltage insulation of electrical conductors, steriade the solid insulator (2) with utverzhdenii polymer matrix (21) and tissue-based (20), comprising cellulose, wherein the fabric base (20) in the form of pressed sheet is deformed in a dry condition, and then impregnated with a polymer resin and immersed solid insulator (2) engine coolant (3).

9. The method according to claim 8, characterized in that the extruded sheet has a thickness d and the minimum radius R of curvature, the ratio R/d is less than 150.

10. The method according to claim 8, characterized in that the deformed extruded sheet forms a frame (6) coil, which is wound at least one winding (1') of the superconducting conductor, and then the frame (6) and the coil (1') together impregnate.



 

Same patents:

FIELD: producing long-measuring composite wires based on high-temperature superconducting compounds.

SUBSTANCE: proposed method includes formation of multiconductor billet by filling silver based reinforced alloy sheath with bismuth ceramic powder, deformation of multiconductor billet obtained to desired size by drawing without heating at deformation degree per pass ranging between 0.5 and 20%, assembly of multiconductor billet by disposing desired number of metered parts of deformed multiconductor billet in mentioned sheath, extrusion of multiconductor billet at temperature of 150 to 300 °C and drawing coefficient of 4 to 30, rolling in the open without heating at deformation degree per pass of 1 to 50%, and thermomechanical treatment under preset conditions. Ceramic core is sequentially compressed to enhance critical current density.

EFFECT: improved conductor geometry, ceramic-to-sheath interface, and ceramic core texture, enhanced wire mechanical properties and sheath resistance, reduced heat conductance of sheath.

1 cl

FIELD: production of long-measuring composite wires based on high-temperature superconducting compounds.

SUBSTANCE: proposed method includes formation of multiconductor billet by filling silver sheath with bismuth ceramic powder, deformation of multiconductor billet obtained to desired size by drawing without heating at deformation degree per pass ranging between 0.5 and 20%, cutting of deformed billet into metered sections, assembly of multiconductor billet by disposing desired number of metered parts of deformed multiconductor billet in sheath made of reinforced silver based alloy, extrusion of multiconductor billet at temperature ranging between 130 and 280 °C and drawing coefficient of 4 to 30, rolling in the open without heating at deformation ratio per pass between 1 and 50%, and thermomechanical treatment under preset conditions. Sequential compression of ceramic core raises density of critical current.

EFFECT: improved geometry of conductors, enhanced wire mechanical properties and resistance, reduced heat conduction of sheath.

1 cl

FIELD: applied superconductivity.

SUBSTANCE: proposed composite superconductor that can be used to manufacture superconductors for superconducting windings suffering heavy mechanical loads (at operating pressure across conductor higher than 100 MPa) as well as for superconducting windings and devices operating under variable conditions, such as superconducting inductive energy storage devices, dipole and quadrupole magnets for charged particle accelerators, has superconducting material fibers, matrix of high-conductivity metal, such as copper and rare-earth intermetallide possessing high thermal capacity at low temperatures. Composite superconductor is provided with metal sheath accommodating rare-earth intermetallide; mentioned wires and conductor are welded together. Metal sheath can be made in the form of hollow cylindrical conductor or flat strip with hollow interlayer, their hollow spaces being designed to dispose rare-earth intermetallide. Composite superconductor is made in the form of a few multiple-fiber composite superconducting wires twisted around hollow cylindrical conductor accommodating rare-earth intermetallide. Composite superconductor can be made in the form of flattened single-lay strand of several multiple-fiber composite superconducting wires and several hollow cylindrical conductors of same diameter accommodating intermetallide which alternately vary within strand. Rectangular-section conductor is made of high-conductivity metal and has longitudinal groove.

EFFECT: enlarged functional capabilities.

7 cl, 8 dwg

FIELD: electrical engineering; producing long conductors around superconducting compounds.

SUBSTANCE: proposed method includes formation of single-core billet by filling silver sheath with bismuth ceramic powder; deformation of this single-core billet to desired size by no-heating drawing at deformation degree per pass of 0.5 - 20%; cutting of deformed billet into measured parts; assembly of single-core billet by disposing desired quantity of measured parts of deformed single-core billet in silver sheath of multicore billet; extrusion of multicore billet at temperature ranging between 100 and 200 °C and at drawing coefficient of 4 to 30; air rolling without heating at deformation degree per pass of 1 - 50%; thermomechanical treatment including several heat-treatment stages at temperature of 830 - 860 °C for time sufficient to obtain phase of desired composition and structure in ceramic core with intermediate deformations between heat-treatment stages at deformation degree per pass of 5 - 30 %.

EFFECT: enhanced critical current density due to sequential packing of ceramic core; facilitated manufacture.

1 cl, 1 ex

FIELD: electrical engineering including superconductivity; improved technologies for producing semiconductors.

SUBSTANCE: when specimen of desired size is produced from working charge, it is pierced with thin threads, such as silk ones, disposed in parallel with direction of current flow in product so as to raise superconducting junction temperature; during heat treatment these threads burn out to form superconducting passages due to free movement of conducting electrons.

EFFECT: enhanced temperature of superconducting junction.

1 cl

The invention relates to the production of superconducting materials and can be used in the electrical industry and other branches of science and technology in the manufacture of superconducting magnetic systems for various applications

The invention relates to techniques and materials with a high conductivity, the methods of their processing
The invention relates to the field of electrical engineering, in particular to a technology for vysokotemperaturnykh superconducting products

The invention relates to electrical engineering and can be used in the production of windings of high field pulsed magnets, as well as for heavy-duty power lines
The invention relates to electrical engineering, in particular to a method for superconductors in the form of composite wide strips and sheets with different number of layers and lived in the layer of high-temperature superconducting (HTS) of compounds designed to create electrical products

FIELD: electrical engineering including superconductivity; improved technologies for producing semiconductors.

SUBSTANCE: when specimen of desired size is produced from working charge, it is pierced with thin threads, such as silk ones, disposed in parallel with direction of current flow in product so as to raise superconducting junction temperature; during heat treatment these threads burn out to form superconducting passages due to free movement of conducting electrons.

EFFECT: enhanced temperature of superconducting junction.

1 cl

FIELD: electrical engineering; producing long conductors around superconducting compounds.

SUBSTANCE: proposed method includes formation of single-core billet by filling silver sheath with bismuth ceramic powder; deformation of this single-core billet to desired size by no-heating drawing at deformation degree per pass of 0.5 - 20%; cutting of deformed billet into measured parts; assembly of single-core billet by disposing desired quantity of measured parts of deformed single-core billet in silver sheath of multicore billet; extrusion of multicore billet at temperature ranging between 100 and 200 °C and at drawing coefficient of 4 to 30; air rolling without heating at deformation degree per pass of 1 - 50%; thermomechanical treatment including several heat-treatment stages at temperature of 830 - 860 °C for time sufficient to obtain phase of desired composition and structure in ceramic core with intermediate deformations between heat-treatment stages at deformation degree per pass of 5 - 30 %.

EFFECT: enhanced critical current density due to sequential packing of ceramic core; facilitated manufacture.

1 cl, 1 ex

FIELD: applied superconductivity.

SUBSTANCE: proposed composite superconductor that can be used to manufacture superconductors for superconducting windings suffering heavy mechanical loads (at operating pressure across conductor higher than 100 MPa) as well as for superconducting windings and devices operating under variable conditions, such as superconducting inductive energy storage devices, dipole and quadrupole magnets for charged particle accelerators, has superconducting material fibers, matrix of high-conductivity metal, such as copper and rare-earth intermetallide possessing high thermal capacity at low temperatures. Composite superconductor is provided with metal sheath accommodating rare-earth intermetallide; mentioned wires and conductor are welded together. Metal sheath can be made in the form of hollow cylindrical conductor or flat strip with hollow interlayer, their hollow spaces being designed to dispose rare-earth intermetallide. Composite superconductor is made in the form of a few multiple-fiber composite superconducting wires twisted around hollow cylindrical conductor accommodating rare-earth intermetallide. Composite superconductor can be made in the form of flattened single-lay strand of several multiple-fiber composite superconducting wires and several hollow cylindrical conductors of same diameter accommodating intermetallide which alternately vary within strand. Rectangular-section conductor is made of high-conductivity metal and has longitudinal groove.

EFFECT: enlarged functional capabilities.

7 cl, 8 dwg

FIELD: production of long-measuring composite wires based on high-temperature superconducting compounds.

SUBSTANCE: proposed method includes formation of multiconductor billet by filling silver sheath with bismuth ceramic powder, deformation of multiconductor billet obtained to desired size by drawing without heating at deformation degree per pass ranging between 0.5 and 20%, cutting of deformed billet into metered sections, assembly of multiconductor billet by disposing desired number of metered parts of deformed multiconductor billet in sheath made of reinforced silver based alloy, extrusion of multiconductor billet at temperature ranging between 130 and 280 °C and drawing coefficient of 4 to 30, rolling in the open without heating at deformation ratio per pass between 1 and 50%, and thermomechanical treatment under preset conditions. Sequential compression of ceramic core raises density of critical current.

EFFECT: improved geometry of conductors, enhanced wire mechanical properties and resistance, reduced heat conduction of sheath.

1 cl

FIELD: producing long-measuring composite wires based on high-temperature superconducting compounds.

SUBSTANCE: proposed method includes formation of multiconductor billet by filling silver based reinforced alloy sheath with bismuth ceramic powder, deformation of multiconductor billet obtained to desired size by drawing without heating at deformation degree per pass ranging between 0.5 and 20%, assembly of multiconductor billet by disposing desired number of metered parts of deformed multiconductor billet in mentioned sheath, extrusion of multiconductor billet at temperature of 150 to 300 °C and drawing coefficient of 4 to 30, rolling in the open without heating at deformation degree per pass of 1 to 50%, and thermomechanical treatment under preset conditions. Ceramic core is sequentially compressed to enhance critical current density.

EFFECT: improved conductor geometry, ceramic-to-sheath interface, and ceramic core texture, enhanced wire mechanical properties and sheath resistance, reduced heat conductance of sheath.

1 cl

FIELD: engineering of high voltage isolation system, useable at low temperature.

SUBSTANCE: high voltage isolation system aside from cooling liquid 3 contains solid isolator 2 on basis of cellulose base fabric 20. Solid isolator 2 is utilized primarily in form of pressed sheets and saturated with polymer resin. At 77K it has high field strength with partial discharges, and also its thermal expansion coefficient is optimally matched with thermal expansion coefficient of ceramic high temperature superconductors. Pressed sheets may be deformed in dry state, in particular, as frames for coils, or as an alternative may be composed with cotton fabrics into laminates of arbitrary thickness. Into base fabric or intermediate layer it is possible to add: carbon in form of filaments or fabrics, glass filaments in form of filaments or fabrics. Method for manufacturing system for high voltage insulation of electric conductors includes deforming base fabric in dry state, saturating it with polymer resin and dipping solid isolator into cooling means. Deformed pressed sheet forms a frame of coil, onto which at least one winding of superconductor is wound, then the frame and winding are saturated jointly.

EFFECT: increased efficiency.

2 cl, 3 dwg

FIELD: electrical engineering; devices designed for operation at liquid helium temperature.

SUBSTANCE: proposed method for manufacturing composite wire includes production of primary composite billet incorporating external sheath and axial cylindrical block, sealing of primary composite billet, reduction, and extrusion, followed by deformation to obtain rod of desired shape and size, its cutting into measured lengths, formation of secondary composite billet by assembling rod in external sheath, sealing of secondary composite billet, reduction, and extrusion, followed by deformation to final size of wire; composite billet reduction involves its pre-extrusion press-fitting in container; total cross-sectional area of composite billet components is 95-99% of that of inner space of container sleeve and inlet part of composite billet external sheath is made in the form of transition zone having cylindrical part whose outer diameter is smaller than that of container sleeve and conical part, volume of voids within composite billet amounting to 1-17% of that of external sheath inner space.

EFFECT: provision for pre-extrusion hot compression of composite billet without additional time requirement.

6 cl, 2 dwg

FIELD: electrical engineering; production of magnesium diboride based high-temperature superconductors.

SUBSTANCE: proposed method for producing single-core and multicore superconductors for critical current density includes production of hollow metal ampoule, its filling with powder in the form of mixture of stoichiometric composition incorporating homogeneous granulated magnesium having clean passivated surface obtained by centrifugal spraying of magnesium heated to 650-850 °C from crucible revolving at speed of 1000-6000 rpm, as well as crystallization of sprayed magnesium in helium environment and amorphous boron powder, deformation of ampoule-powder element by extrusion at temperature of 450-500 °C and extrusion coefficient of 3-6, followed by drawing with deformation degree of 5-10% per pass, and heat treatment at 800-900 °C for 1-10 in vacuum or argon environment.

EFFECT: improved quality of superconductor core due to higher quality of magnesium powder and especially improved condition of magnesium powder surface.

5 cl

FIELD: electrochemistry.

SUBSTANCE: proposed method involves filling of cylindrical bag with auxiliary parts which are then removed from bag and replaced by bar assemblies placed in definite sequence affording maximal filling density; sectional area of each auxiliary member differs from that of its substituting bar; central regular-hexagon shaped auxiliary member has face width A1 found from expression where a is hexagonal bar width, M is number of bars in diametric direction; second row around central member is alternately filled with auxiliary members of which three ones are regular-hexagon shaped members having face width A2 found from expression and three other hexagon-shaped auxiliary members have face width found from set of expressions all next rows are alternately filled with auxiliary hexagon-shaped members whose face width is found from set of expressions and remaining free space between hexagon-shaped auxiliary members, as well as cylindrical bags are filled with additional auxiliary members whose cross-sectional area provides for maximal filling of bags.

EFFECT: facilitated procedure, ability of filling billet with thousands of bars during its single assembly process.

3 cl, 7 dwg

FIELD: electrical engineering.

SUBSTANCE: proposed superconducting device has superconducting oxide wire made of superconducting oxide material whose post-sintering density is 93% and more, best 95% and more, or most preferably 99% or more, which is attained by heat treatment of wire in enhanced pressure environment of at least 1 MPa and below 50 MPa. Heat treatment of wire at enhanced pressure prevents formation of gaps and bubbles. Stable superconducting oxide phase of Bi2223 is formed in the process.

EFFECT: enhanced critical current density of superconducting device and superconducting cable.

6 cl, 27 dwg, 4 tbl, 6 ex

Up!