KR20170003341A - Superconducting cable - Google Patents

Abstract

The present invention relates to a superconducting cable applying a cooling unit which cools a superconducting wire with liquefied coolants and an insulation material which can minimize a heat invasion to the inside due to thermal conduction or radiation. Accordingly, the present invention can minimize the heat invasion due to the radiation by effectively reflecting radiant heat.

Description

Superconducting cable {SUPERCONDUCTING CABLE}

The present invention relates to a superconducting cable. More particularly, the present invention relates to a superconducting cable to which a heat insulating material capable of minimizing heat intrusion by thermal conduction or radiation is cooled inside a cooling unit for cooling a superconducting wire with liquid coolant.

The superconducting wire has a large power transmission capability even at a low voltage since the electric resistance converges near zero at a constant temperature.

In order to form and maintain a cryogenic environment, a superconducting cable having such a superconducting wire uses a method of cooling using a coolant such as nitrogen and / or an adiabatic method of forming a vacuum layer.

Minimizing thermal intrusion by heat conduction or radiation from the outside to the core inside is necessary to reduce the cooling load of the superconducting cable and to improve the stability of the superconducting power system.

Accordingly, there is a demand for a heat insulating material having improved heat insulating performance that can minimize heat penetration by heat conduction or radiation.

An object of the present invention is to provide a superconducting cable to which a heat insulating material capable of minimizing thermal intrusion by thermal conduction or radiation is applied inside a cooling part for cooling a superconducting wire with liquid coolant.

According to an aspect of the present invention, there is provided a cooling device for a cooling device, comprising: a core portion having a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer successively formed thereon; And a vacuum separating space provided outside the heat insulating portion, wherein the heat insulating film comprises a plurality of metal heat insulating films and a spacing member interposed between the heat insulating films And the heat insulating member is cut so that the width of the heat insulating member is 100 mm to 250 mm, and the heat insulating member is cut into a plurality of The superconducting cable can be provided.

Further, the heat insulating material can be manufactured by stacking the heat insulating film in three to six layers.

Here, the spacing member may be formed as a sheet of a fiber material.

In addition, the heat insulating material may be laser-cut so that the width of the heat insulating film and the spacing member are 100 mm to 250 mm.

In the process of laser cutting the heat insulating material, the heat insulating film forming each layer on the cut surface is bonded to the heat insulating film of the peripheral layer, and the bonding state of the cut surface is 5 mm (millimeters) in an arbitrary 10 centimeter (cm) Or more.

The heat insulating film may be made of aluminum.

The single film may be provided with discharge holes formed by puncturing at predetermined intervals in the longitudinal direction.

Here, when the heat insulating material is spirally wound, the overlap amount may be 1/4 to 1/2 of the heat insulating material width.

The direction and angle of winding of the heat insulating material constituting the heat insulating portion are determined by the direction and angle of the valley and the floor of the bent structure such as the inner metal tube, Can be set differently.

According to the present invention, there is provided a superconducting cable in which a heat insulating material is formed by winding a heat insulating material in multiple layers to form a heat insulating material, and the heat insulating material itself laminates the heat insulating film in a multilayered structure. In the heat insulating film itself, Heat penetration due to conduction in the core portion of the superconducting cable can be minimized.

In addition, according to the superconducting cable of the present invention, since the heat insulating film itself is provided with the two-layered spaced apart aluminum layer, it is possible to effectively reflect radiant heat, thereby minimizing thermal intrusion into the inside of the core portion by radiation.

1 is a perspective view of a superconducting cable according to a first embodiment of the present invention.
Fig. 2 shows a cross-sectional view of the superconducting cable shown in Fig.
FIG. 3 is a perspective view showing a multi-stage unmolded insulating material constituting the heat insulating portion of the superconducting cable according to the present invention.
4 shows another embodiment of a superconducting cable according to the present invention.
Fig. 5 shows a cross-sectional view of the superconducting cable shown in Fig. 4 in a state in which it is installed in a horizontal direction.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a perspective view of a superconducting cable according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the superconducting cable shown in FIG.

The basic structure of a superconducting cable according to the present invention will be described.

The superconducting cable shown in FIG. 1 comprises a former 110, at least one superconducting conductor layer 130 including a plurality of superconducting wires arranged in the longitudinal direction of the former 110 so as to surround the former 110 An insulating tape 140 surrounding the superconducting conductor layer 130 and a plurality of superconducting wires arranged in the longitudinal direction of the former 110 to surround the insulating tape 140, A superconducting shield layer 180 formed on the core portion 100 to cover the core portion 100 and a core layer 100 disposed on the outer side of the core portion 100 for cooling the core portion 100, A cooling unit 200 having a coolant channel for a coolant, an inner metal pipe 300 provided outside the cooling unit 200, and a heat insulating material 401 disposed outside the inner metal pipe 300, The heat insulating portion 400, which forms the heat insulating layer, A vacuum chamber 500 having a plurality of spacers 560 spaced apart from the outer surface of the heat insulating part 400 for vacuum insulation of the cooling part 200, (600), and an outer jacket (700) provided outside the outer metal pipe (600) to form a sheath layer.

The components of the superconducting cable are summarized as follows. The former 110 functions as a frame for forming a shape while providing a place for mounting a flat, flat and long superconducting wire around the former 110, and can be a path through which a fault current flows. The former 110 may have a shape in which a plurality of copper (Cu) conductor wires 111 having a circular cross section are compressed in a circular shape.

Specifically, the former 110 is basically formed into a round cylindrical shape, and serves as a frame for raising the flat, long superconducting wire. The diameter of the former 110 is determined to be as close to a circular shape as possible when the superconducting wire is placed on the former 110 between the superconducting wires without considering the width of the superconducting wire.

As shown in FIGS. 1 and 2, the former may be formed in a shape of a full center, but the former 110 is formed in a hollow pipe shape and functions as a frame for raising the superconducting wire, And the conductor wires 111 constituting the former may be constituted by copper or the like and by connecting the respective wires in parallel with the respective superconducting wires, It may also be configured to act as a conductor to the ear when a fault current occurs due to a system short circuit (fault, lightning, insulation breakdown, etc.).

In the power system, when a fault current is generated, the conductors of the return conductors are attached to the respective superconducting wires as well as a conductive layer made of a metal material having conductivity at room temperature in addition to formers composed of the conductor wires 111 as described later. The conductive layer may be in the form of a metal tape. A detailed description thereof will be described later.

Depending on the capacity of the fault current, the cross-sectional area of the conductor, such as copper, constituting the strand can be determined. In the case of high voltage, the strand of copper can be compressed into a circular shape to form a stranded shape.

As described below, the superconducting wire constituting the superconducting cable according to the present invention is provided with a conductive layer of a metal material having conductivity at room temperature on both surfaces of the superconducting wire to reinforce the mechanical rigidity of the superconducting wire. Such an energized layer reinforces the mechanical rigidity and can prevent the superconducting wire from being broken due to the torsional stress during the winding of the superconducting wire.

Such an energizing layer can reinforce the mechanical rigidity of the superconducting wire, and at the same time, when an accident such as a short circuit occurs, it can be performed with the former together with the role of the ear of the fault current. Therefore, the former of the superconducting cable according to the present invention, The diameter of the former may be smaller than the diameter of the former. I will postpone the specifics.

The surface of the former 110 is inevitably convex because it is in the form of a strand formed by compressing a plurality of circular circular conductor wires 111 constituting the former 110 into circular shapes. Accordingly, a smoothing layer 120 may be coated on the outside of the former 110 to smooth the convex surface of the former 110. The smoothing layer 120 may be made of semiconductive carbon paper or brass tape.

Between the smoothing layer 120 and the superconducting conductor layer 130, a cushion layer may be further provided although not shown in the figure. The cushion layer may be provided to protect the superconducting conductor layer using a semi-conductive carbon paper tape.

A first superconducting conductor layer 130a may be provided on the outer side of the former 110 which is planarized by the smoothing layer 120 and is surrounded by a plurality of superconducting wires 131. The first superconducting conductor layer 130a may be installed so as to surround a plurality of superconducting wires adjacent to each other and around the smoothing layer 120. [

Also, as shown in FIG. 1, the superconducting conductor layer 130 may be formed in a multi-layer structure according to the capacity of a current to be transmitted or distributed through the superconducting cable.

The embodiment shown in FIG. 1 shows a total of two superconducting conductor layers 130a and 130b.

When a superconducting conductor layer is provided in a plurality of layers, an insulating tape 140 may be provided between the superconducting conductor layers 130a and 130b. The reason why the insulating tape 140 is disposed between the superconducting conductor layers 130a and 130b is to control the directionality of currents in the superconducting conductor layers 130a and 130b constituting each layer. If the insulating tape 140 is not provided, the current path may be disturbed and the current may not flow in the intended direction. The conductive direction of the superconducting conductor layers stacked in a multilayer by the insulating tape 140 can be matched.

Incidentally, by providing the insulating tape 140, the skin effect of the superconducting wire composing each superconducting conductor layer can be prevented.

In the embodiment shown in FIG. 1, the superconducting conductor layer 130 is composed of two layers of the first superconducting conductor layer 130a and the second superconducting conductor layer 130b. However, if necessary, A conductor layer may also be provided.

The superconducting wires constituting each of the superconducting conductor layers 130a and 130b may be connected in parallel with the respective superconducting wires constituting the former 110. [ So that the current flowing through the superconducting wire can be classified into the fault current of the former 110 at the time of an accident such as a short-circuit (fault, lightning, insulation breakdown, destruction of superconducting condition, etc.). In this way, heat generation or damage of the superconducting wire can be prevented.

The inner semiconductive layer 150 may be provided outside the second superconducting layer 130b provided outside the first superconducting conductor layer 130a. The inner semiconductive layer 150 may be provided to alleviate field concentration of the superconducting layer 130 and to smooth the surface electric field. Specifically, it can be provided to alleviate the electric field concentration generated at the corner portion of the superconducting wire and to even out the electric field distribution. This also applies to the outer semiconductive layer 170 described later.

The inner semiconductive layer 150 may be provided in such a manner that the semiconductive tape is wound.

An insulating layer 160 may be provided outside the inner semiconductive layer 150. The insulation layer 160 may be provided to increase the dielectric strength of the superconducting cable. Generally, XLPE (Cross Linking-Polyethylene) or oil filled cable is used for insulation of high voltage cable. However, superconducting cable is cooled to cryogenic temperature for superconductivity of superconducting wire, and XLPE is broken at insulation And the oil filled cable may cause an environmental problem. Therefore, the superconducting cable according to the present invention may use insulating paper of a general paper as the insulating layer 160, May be configured in such a manner that the insulating paper is wound plural times.

Kraft paper or PPLP (Polypropylene Laminated Paper) is mainly used as the insulating paper. PPLP insulating paper is used for superconducting cable among various insulation materials considering the ease of winding and the dielectric strength.

The outer semiconductive layer 170 may be provided outside the insulating layer 160. The outer semiconducting layer 170 may also be provided in such a manner that the semiconducting tape is wound on the outer semiconducting layer 170. The outer semiconducting layer 170 may also be provided in order to alleviate the field concentration of the superconducting conductor layer 130 and to smooth the surface electric field. .

In addition, a superconducting shield layer 180 may be provided outside the outer semiconductive layer 170. The method of forming the superconducting shield layer 180 may be the same as the method of forming the superconducting conductor layer 130. If the surface of the outer semiconductive layer 170 is uneven, a smoothing layer (not shown) may be provided if necessary. A superconducting wire for forming the superconducting shield layer 180 on the outside of the smoothing layer may be provided in the circumferential direction As shown in FIG.

The current flowing through the shielding layer composed of the second generation superconducting wire may be designed to be about 95% of the current flowing through the superconducting conductor layer, thereby minimizing the leakage magnetic field.

A core outer layer 190 may be provided on the outer side of the superconducting shield layer 180 to serve as a core of the core unit 100. The core outer layer 190 may include various tapes, binders, and the like. The core outer layer 190 serves to externally expose the core portion 100 to a cooling layer, which will be described later, and to bind all components of the core portion 100 And may be made of a metal tape such as SUS material.

1 and 2, the smoothing layer and the semiconductive layer are formed of a single layer of the same material, but it is also possible to use various sublayers Can be added.

The cooling unit 200 may be provided outside the core unit 100. The cooling unit 200 may be provided to cool the superconducting wire of the core unit 100, and the cooling unit 200 may include a circulating flow path for liquid coolant inside the cooling unit 200. The liquid-phase refrigerant (liquid nitrogen) circulates through the refrigerant passage in a cooled state so as to have a temperature of about minus -200 degrees, and is provided in the core section 100 inside the cooling section. The superconducting condition of the superconducting wire can be maintained.

The cooling channel provided in the cooling unit 200 may allow the liquid-phase refrigerant to flow in one direction, may be recovered from the connection box of the superconducting cable, re-cooled, and then supplied to the cooling channel of the cooling unit 200.

An inner metal pipe 300 may be provided outside the cooling unit 200. The inner metal pipe 300 functions as an outer casing of the superconducting cable for preventing the mechanical damage of the core part 100 during installation and operation of the superconducting cable together with the outer metal pipe 600 to be described later. The superconducting cable is wound on the drum for easy manufacture and transportation. When installed, the cable wound around the drum is expanded and installed, so that bending stress or tensile stress can be continuously applied to the superconducting cable.

An internal metal pipe 300 may be provided to maintain the initial performance even under such a mechanical stress. Therefore, the inner metal pipe 300 has a corrugated shape in which the superconducting cable is repeatedly protruded and recessed in the longitudinal direction for reinforcing the rigidity against mechanical stress, and the inner metal pipe 300 is made of a material such as aluminum .

Since the internal metal pipe 300 is provided outside the cooling unit 200, it may be a very low temperature corresponding to the temperature of the liquid refrigerant. Therefore, the inner metal pipe 300 may be divided into a low-temperature metal pipe.

The heat insulating layer may be provided to form multi layer insulation (MLI) and to prevent heat intrusion to the inner metal pipe 300 side.

Particularly, since the internal metal pipe 300 is made of a metal material, it is easy to perform heat invasion or heat exchange by conduction, so that the heat insulating part 400 can minimize heat exchange or heat invasion by conduction, It is possible to obtain an effect of preventing heat exchange or heat penetration by radiation due to the film material.

The heat insulating material constituting the heat insulating portion 400 will be described in detail with reference to FIG.

A vacuum 500 may be provided outside the heat insulating part 400. The vacuum chamber 500 may be provided to minimize heat transfer due to convection in the direction of the heat insulating layer, which may be generated when the heat insulating portion 400 does not provide sufficient heat insulation.

The vacuum chamber 500 can be formed by forming a space outside the heat insulating part 400 and vacuuming the space.

The vacuum chamber 500 may be provided with at least one spacer 560 to form a physical spacing space, which is provided to prevent heat penetration due to convection from the outside to the core portion from the outside. In order to prevent the outer metal pipe 600 and the like provided on the outer side of the spacing space in the vacuum chamber 500 from contacting the heat insulating part 400 on the inside of the vacuum chamber 500 in the entire area of the superconducting cable, At least one spacer 560 may be provided in the superconducting cable 530, and may be increased or decreased depending on the type or size of the superconducting cable or the spacer. Although the superconducting cable 1000 shown in FIGS. 1 and 2 is shown as having four spacers, the number of superconducting cables 1000 can be increased or decreased.

The spacer 560 may be disposed along the longitudinal direction of the superconducting cable and may be wound around the core 100, specifically, to surround the heat insulating part 400 in a spiral or a circular shape.

The number of the spacers 560 may be three to five spacers in the superconducting cable according to the present invention. The spacers form a spacing space to prevent heat exchange by conduction. The structure of the spacers may be a single layer or a multi-layer structure.

The spacer 560 may be made of various resin materials, for example, polyethylene (PE).

The spacer 560 may be made of a fluororesin (for example, PTFE, Teflon ™, or the like) or may be made of a general resin (for example, polyethylene ) Back surface may be coated with a fluororesin (e.g., fluorinated polyethylene).

Fluorinated polyethylene is a kind of fluororesin. It forms a very stable compound due to strong chemical bonding between fluorine and carbon, and has nearly complete chemical inertness and heat resistance, non-tackiness, excellent insulation stability and low coefficient of friction.

Since the fluorinated polyethylene has a certain degree of flexibility, it can spirally wrap the heat insulating part 400 and can be disposed in the longitudinal direction of the superconducting cable, and since the heat insulating part 400 has a certain strength, And the outer metallic pipe 600. The external space of the vacuum cleaner 500 can be used to physically maintain the spacing space. The diameter of the spacer 560 may be between 3 millimeters (mm) and 8 millimeters (mm). The cross-sectional shape of the spacer 560 may be circular, triangular, square, star-shaped, or the like.

The outer metal pipe 600 may be provided outside the vacuum chamber 500 provided with the spacer 560. The outer metal pipe 600 may have the same shape and material as the inner metal pipe 300 and the outer metal pipe 600 may have a larger diameter than the inner metal pipe 300, It is possible to form a spacing space. A detailed description of the spacer 560 is omitted hereafter.

In addition, an outer jacket 700 may be provided outside the outer metal pipe 600 to perform an outer function for protecting the inside of the superconducting cable. The outer jacket may be a sheath constituting the outer jacket 700 of a conventional power cable. The outer jacket 700 can prevent corrosion of the metal pipe 600 and the like inside the outer jacket 700 and prevent damage to the cable due to external force. Polyethylene (PE), polyvinyl chloride (PVC), and the like.

FIG. 3 is a perspective view showing a multi-stage unmolded insulating material constituting the heat insulating portion of the superconducting cable according to the present invention.

As shown in FIG. 3, the heat insulating material 410 has a structure in which the heat insulating film 411 and the spacing members 412 are alternately stacked a plurality of times.

The heat insulating film 411 may be formed of a metal material in a thin film form having a good reflectance, for example, an aluminum film. The heat insulating material 410 may include three to five heat insulating films, and the spacing members 412 may be provided between the heat insulating films 411 of the respective layers.

The spacing member 412 may isolate the heat insulating films 411 forming each layer to prevent mutual contact of the heat insulating films 411 to block heat conduction and the like. That is, since the heat insulating film 411 is made of a metal material having a good reflectance, the heat insulating film 411 plays a role of preventing radiation heat penetration, but heat invasion by conduction is not prevented by the material characteristics.

Therefore, the spacing member 412 can be added between the heat insulating films 411 constituting the heat insulating material 410 to block or minimize heat intrusion by radiation and heat conduction.

The spacing member 412 may be made of various materials as long as the spacing member 412 is made of a fiber material having a low thermal conductivity. Specifically, the spacing member 412 may be formed in the form of a sheet of a fibrous material, and preferably has a structure that minimizes the contact area to block heat conduction, but can prevent mutual contact between the heat insulating films.

At least one surface of the heat insulating film 411 may be processed into a reflecting surface of radiant heat. That is, the heat insulating film 411 may be provided with a reflecting surface only on one side, or both sides may be subjected to a reflecting surface processing. When the heat insulating film 411 having both reflective surfaces is used, the radiation heat penetration is blocked at both sides, and the heat is efficiently The heat insulation effect can be improved by blocking the radiation heat intrusion.

In summary, the heat insulating material 410 may include a three-layer to five-layer heat insulating film 411 spaced apart, and a spacing member 412 disposed between the respective heat insulating films 411.

When the heat insulating material 410 shown in FIG. 3 is stacked in three to five layers, one heat insulating member (MLI TAPE, not shown) can be formed.

The heat insulating member composed of the heat insulating material 410 may be cut to have a width w ranging from 100 mm to 250 mm.

The heat insulating member composed of the heat insulating material 410 is spirally wound so as to be laminated on the outer side of the inner metal tube 300 partitioning the cooling part 200 in a multilayered manner.

Radiation heat and conduction heat can be efficiently blocked by the heat insulating part 400 formed by winding the heat insulating member composed of the heat insulating material 410, thereby minimizing thermal intrusion by radiation or conduction to the inside of the core part.

In order to make the width of the heat insulating member composed of the heat insulating material 410 laminated alternately with the heat insulating film having a large area and the spacing members alternately from 3 to 5 layers to have a width of 100 to 250 millimeters .

The heat insulating films composed of the heat insulating material 410 can be bonded to each other on the cut surface 410c in the laser cutting process and the boundaries of the heat insulating tapes stacked on the cut surface cut by the laser cutting are cut along the cut surface 410c It is preferable that there is no separation region of 5 mm (mm) or more at a length of 10 cm (cm) or less.

That is, in the case where there is a section separated by 5 millimeters (mm) or more from the cut surface between the heat insulating films 411 constituting each layer based on a predetermined distance interval, about 10 centimeters (cm) .

Since the side surface of the heat insulating member 410 is joined by laser cutting as described above, the heat insulating film 411 is formed so that the gas remaining in each layer can be discharged to the outside during the manufacturing process of the cable. A discharge hole 411h may be formed by puncturing at a predetermined interval. The size or the interval of the discharge holes may be changed according to the width of the heat insulating material or the like.

The distance between the discharge holes 411h formed in the heat insulating member formed of the heat insulating material 410 may be 110 mm to 180 mm in the longitudinal direction of the heat insulating member.

When the interval between the discharge holes 411h is set to 110 mm or less in order to enhance the discharging function of the residual gas, the discharge function is improved, but the heat penetration through the discharge hole 411h is increased, It is experimentally confirmed that when the interval between the discharge holes 411h is set to 180 millimeters (mm) or more, the residual gas is not sufficiently removed.

When the heat insulating member composed of the heat insulating material 410 is spirally wound to a predetermined overlapping amount outside the inner metal tube 300, several tens of the heat insulating films can be used for heat insulation in the radial direction of the cable cross section.

When the heat insulating member is spirally wound, the overlapping amount (width) with the adjacent heat insulating member may be 1/4 to 1/2 of the width of the heat insulating member, and preferably, 1/3.

The number of the heat insulating members constituting the heat insulating part 400 can be adjusted to minimize heat penetration. It is important to use the appropriate number of layers because the heat shielding effect is lowered by the convection heat blocking effect and the thinning of the vacuum layer due to the convection.

In addition, the heat insulating members constituting the heat insulating part 400 are spirally wound along the longitudinal direction of the cable in a predetermined direction as described above. The corrugation structure of the inner metal pipe 300 and the outer metal pipe 600 is also generally formed in a spiral shape.

Therefore, when the valley and the floor of the bending structure such as the inner metal pipe 300 are formed in a spiral shape, the direction in which the heat insulating member constituting the heat insulating part 400 is wound and the winding angle are different from each other, When the direction and the angle of the floor are matched with each other, the heat insulating material is seated between the corrugated floor and the floor, thereby removing the space depending on the shape of the floor and the floor, thereby increasing the possibility of heat penetration by heat conduction.

Therefore, it is preferable that directions and angles of the valley and the valley of the bent structure such as the inner metal tube are different from each other in the direction in which the heat insulating member constituting the heat insulating part 400 is wound and the winding angle is set to be different from each other. It is important to wind the insulator so that the insulator does not get caught in the valley or groove of the inner metal tube at the time of winding for the winding.

FIG. 4 illustrates another embodiment of a superconducting cable according to the present invention, and FIG. 5 illustrates a cross-sectional view of the superconducting cable shown in FIG. 4 in a horizontal direction.

The description with reference to Figs. 1 to 3 will be omitted. 4 and 5 illustrate a three-phase superconducting cable in which the number of core units 100 provided in a superconducting cable is three.

The three-phase superconducting cable may have a structure in which the core units 100 share the cooling unit 200 outside the three core units 100 instead of having the cooling unit 200 independently, And the vacuum 500 may also be shared outside the cooling unit 200.

The superconducting cable shown in FIG. 4 and FIG. 5 also has a structure in which thermal invasion is generated to the core portion side to be maintained at a cryogenic temperature by applying the heat insulating material 400 shown in FIG. 3 that minimizes thermal invasion by conduction or radiation The same is true for minimization.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

1000: Superconducting cable
100: core part
130: superconducting conductor layer
180: superconducting shield layer
200:
300: internal metal tube
400:
500: the jeans study
560: Spacer
600: outer metal tube
700: Outer jacket

Claims (8)

A core part including a superconducting layer, a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer sequentially;
A cooling part for cooling the core part with coolant through the cooling oil outside the core part;
A heat insulating portion for preventing heat penetration outside the cooling portion;
And a vacuum spacing space provided outside the heat insulating portion,
A heat insulating member is formed by laminating three to five layers of a heat insulating material composed of a heat insulating film of a plurality of metal members and a spacing member interposed between the respective heat insulating films,
Wherein the heat insulating portion is formed by cutting the heat insulating member to have a width of 100 mm to 250 mm and winding the heat insulating member a plurality of turns spirally outside the cooling portion. The method according to claim 1,
Wherein the heat insulating material is manufactured by stacking three to five layers of heat insulating films. The method according to claim 1,
Wherein the spacing member is formed in a sheet form of a fiber material. The method according to claim 1,
Wherein the heat insulating film is made of aluminum. 5. The method of claim 4,
Wherein the single film is provided with a discharge hole formed by punching at predetermined intervals in the longitudinal direction. The method according to claim 1,
Wherein when the heat insulating member is spirally wound, the superimposed amount is 1/4 to 1/2 of the width of the heat insulating member. The method according to claim 1,
The direction and angle of winding of the heat insulating material constituting the heat insulating portion are different from each other in the direction and angle of the valley of the curved structure such as the inner metal pipe or the like Superconducting cable with feature set. The method according to claim 1,
Wherein a distance between the discharge holes formed in the heat insulating member composed of the heat insulating material is 110 mm to 180 mm in the longitudinal direction of the heat insulating member.

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