KR102005584B1 - Superconducting cable - Google Patents

Abstract

The present invention relates to a superconducting cable capable of constructing a large-capacity optical communication line through a superconducting cable.

Description

Superconducting cable {SUPERCONDUCTING CABLE}

The present invention relates to a superconducting cable. More particularly, the present invention relates to a superconducting cable capable of constructing a large-capacity optical communication line through a superconducting cable.

Optical hybrid cables have been introduced for general power cables. The superconducting system has a merit that a large amount of current can be transmitted even at a relatively low voltage by using the characteristic that the resistance of the superconductor converges to zero at a cryogenic temperature.

The superconducting cable constituting such a superconducting system is a power cable that can be used in transmission or distribution, and no method for constructing a large-capacity telecommunication line through a superconducting cable has been introduced.

In order for the superconducting cable to function as a communication line, the reliability of the cryogenic environment for ensuring the superconducting condition of the superconductor must be ensured. Specifically, it is necessary to ensure the stability of the superconducting condition of the superconducting cable in the process of maintenance, repair or bonding of the optical cable as the communication cable provided in the superconducting cable, and maintenance, repair or bonding process of the optical cable, etc., provided in the superconducting cable is excessively cumbersome Or not difficult.

Disclosed is a superconducting cable capable of constructing a large-capacity optical communication line through a superconducting cable.

According to an aspect of the present invention, there is provided a method of manufacturing a superconducting element, comprising: forming a superconducting layer including a plurality of superconductors arranged side by side in a longitudinal direction of the former to surround the former, At least one superconducting shield layer including a plurality of superconductors arranged in parallel with each other in a longitudinal direction of the former to surround an outer layer of the core, A cooling unit having a coolant channel for liquid coolant for cooling the core unit, and at least one flexible rod-shaped spacer provided outside the cooler unit for vacuum insulation of the coolant unit A sheath portion provided on the outside of the vacuum chamber to form a sheath layer, There is provided a superconducting cable including at least one optical fiber for line construction arranged in the longitudinal direction of the core portion.

In addition, there is provided an inner metal tube in a structure having a swollen structure in which ridges and depressions are repeatedly formed outside the cooling part, and a thermal insulating part formed on the outer side of the inner metal tube to form a heat insulating layer wound with several layers of heat insulating material, And can be provided on the outer side.

The optical fiber receiving tube is provided with at least one inner tube in an outer tube forming an envelope, and each of the inner tubes can accommodate at least one optical fiber.

Here, a plurality of core portions provided inside the cooling portion may be provided.

In this case, the optical fiber receiving tube is mounted in the superconducting cable in the manufacturing step of the superconducting cable, and the optical fiber can be inserted by an air blowing method by pneumatic pressure while the superconducting cable is installed and connected.

The optical fiber may be accommodated in the optical fiber accommodating tube.

The optical fiber inserted into the inner tube inside the outer tube may be in the form of an aggregate optical fiber in which at least two optical fibers are integrated.

The number of the optical fibers constituting the aggregated optical fibers inserted into the at least one inner tube may be different from the number of the optical fibers constituting the aggregated optical fibers inserted into the other inner tubes .

In this case, the outer tube and the inner tube may be made of a polyethylene material or a fluorinated polyethylene material, the outer diameter of the outer tube may be 5 millimeters (mm) to 7 millimeters, and the thickness of the outer tube may be 0.8 millimeters mm) to 1.2 millimeters (mm).

According to another aspect of the present invention, there is provided a method for cooling a core, comprising the steps of: forming a core including a former, a superconducting layer, an insulating layer, and a superconducting shield layer; A cooler provided with a coolant channel of the liquid coolant; a vacuum chamber provided outside the cooling unit for vacuum insulation of the cooling unit; a sheath provided outside the vacuum chamber to form a sheath layer; And a plurality of spacing means disposed along the longitudinal direction of the core portion and spaced apart from the cooling portion and the outer side of the center portion and having a communication function.

In addition, the separating means may separate the outer metal tube provided on the inner side of the sheath portion and the heat insulating portion provided on the inner side of the vacuum chamber to a plurality of layers.

The spacing means may include at least one optical fiber.

In addition, the spacing means may include a tube made of polyethylene, and the optical fiber may be provided inside the tube.

The tube may include an outer tube and a plurality of inner tubes in the outer tube, and the optical fiber may be mounted to the inner tube in an air-blown manner.

According to another aspect of the present invention, there is provided a method for cooling a core, comprising the steps of: forming a core including a former, a superconducting layer, an insulating layer, and a superconducting shield layer; A cooler provided with a coolant channel of the liquid coolant; a vacuum chamber provided outside the cooling unit for vacuum insulation of the cooling unit; a sheath provided outside the vacuum chamber to form a sheath layer; At least one spacer in the form of a hollow tube disposed along the longitudinal direction of the core portion, and at least one optical fiber inserted into the spacer to provide a communication function.

In this case, the spacer is mounted in the superconducting cable in the manufacturing process of the superconducting cable, and the optical fiber can be inserted by air blowing by pneumatic pressure in a state where the superconducting cable is completely installed and connected.

Also, the optical fiber may be in the form of an aggregate optical fiber in which at least two optical fibers are integrated, and the spacer is made of a polyethylene material or a fluorinated polyethylene material, and the outer diameter of the spacer is 5 mm to 7 mm ), And the thickness of the spacer may be from 0.8 millimeter (mm) to 1.2 millimeter (mm).

The superconducting cable according to the present invention can provide power and communication functions through a single cable including a communication cable constituting a large-capacity optical line in addition to a power transmission function.

In addition, according to the superconducting cable according to the present invention, since the communication cable is disposed in the vacuum formed to block heat penetration from the outside at normal temperature, the volume increase of the superconducting cable generated by adding the communication cable can be minimized .

Further, since the superconducting cable according to the present invention is installed in the superconducting cable after the completion of the transportation, installation and connection of the superconducting cable in the air blowing manner, the time required for forming the communication line or The cost can be minimized, and the number of connection portions of the optical fibers can be minimized.

1 is a perspective view of a superconducting cable according to an embodiment of the present invention.
Fig. 2 shows a cross-sectional view of the superconducting cable shown in Fig.
3 shows a communication cable mounted on a superconducting cable according to the present invention.
FIG. 4 is a perspective view of a superconducting cable according to another embodiment of the present invention.
Fig. 5 shows a cross-sectional view of the superconducting cable shown in Fig. 4. Fig.

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 includes a former 110, at least one superconductor layer 130 including a plurality of superconductors arranged in a longitudinal direction of the former 110 so as to surround the former 110, And at least one superconducting shield layer 180 including a plurality of superconductors arranged in the longitudinal direction of the former 110 so as to surround the outside of the insulating layer 140, Which is provided outside the core part 100 and includes a coolant channel for liquid coolant for cooling the core part 100, for cooling the core part 100, (Not shown) provided with a spacer 560 in the form of a rod, which is provided outside the cooling unit 200 and has at least one or more flexible rods 200 for vacuum insulation of the cooling unit 200, 500) and the outer side of the vacuum chamber (500) There are cis-layer sheath 700 and at least one optical fiber in order to establish a glow to the vacuum 500 for forming the can comprises a communication cable 10, which is disposed in the core portion in the longitudinal direction.

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

The surface of the former 110 has to be convex because it is in the form of a strand formed by compressing circular strands 111 of copper having a circular cross section in a circular shape. 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.

A first superconductor 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 superconductors 131. [ The first superconductor layer 130a may be disposed around the smoothing layer 120 in parallel with a plurality of superconductors.

Also, the superconductor layer 130 may be composed of multiple layers depending on the capacity of the current to be transmitted or distributed through the superconducting cable.

The embodiment shown in FIG. 1 is shown with a total of two superconducting layers 130. When the superconductor layer 130 is simply stacked and disposed, the current capacity is not increased according to the skin effect of the current. In the case where the superconductor layer 130 is provided in a multi-layer structure, Layer 140 may be provided. The insulating layer 140 is disposed between the superconductor layers 130, which are formed in the form of an insulating tape and are laminated to insulate the superconductor layer 130, thereby preventing the superficial effect of the superconductor. In the embodiment shown in FIG. 1, the superconductor layer 130 includes two layers of the first superconductor layer 130a and the second superconductor layer 130b. However, if necessary, more layers of the superconductor layer 130 May be provided.

The superconductors constituting each superconductor layer 130 may be connected in parallel with the respective superconductors constituting the former 110. So that the current flowing through the superconductor flows to the strand of the former 110 at the time of an accident such as destruction of the superconducting condition. When the superconducting condition is not satisfied in this way, the resistance of the superconductor is increased and the superconductor is prevented from being heated or damaged.

And the inner semiconductive layer 150 may be provided outside the second superconductor layer 130b. The inner semiconductive layer 150 may be provided to alleviate field concentration of the superconductor layer 130 and to smooth the surface electric field. The inner semiconductive layer 150 may be provided in such a manner that the semiconductive tape is wound.

An insulating layer 140 may be provided outside the inner semiconductive layer 150. The insulation layer 140 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 superconductor, and XLPE is broken at extremely low temperature, And the oil filled cable can cause environmental problems. Therefore, the superconducting cable according to the present invention can use an insulating paper of a general paper as the insulating layer 140, and the insulating layer 140 The insulating paper may be wound plural times.

The outer semiconductive layer 170 may be provided outside the insulating layer 140. The outer semiconducting layer may also be provided to alleviate the field concentration of the superconducting layer 130 and to smooth the surface electric field. The outer semiconductive layer 170 may also be provided in a manner that the semiconductive tape is wound.

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

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, and may serve as a casing for exposing the core portion 100 to a cooling layer described later.

1 and 2, the smoothing layer, the inner semiconductive layer 150, or the outer semiconductive layer 170 may be formed of a single layer of the same material as the core layer 100 of the superconducting cable Although shown as being constructed, various sublayers may be added as needed.

The cooling unit 200 may be provided outside the core unit 100. The cooling unit 200 may be provided to cool the superconductor of the core unit 100, and the cooling unit 200 may be provided with a circulating flow path for the liquid phase refrigerant. The liquid-phase refrigerant may be circulated through the refrigerant channel in a cooled state to maintain a superconducting condition of the superconductor provided on the inner side.

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 serves as an outer casing of the superconducting cable for preventing the mechanical damage of the core unit 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 structure 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.

In addition, the outer surface of the inner metal pipe 300 may be provided with a heat insulating part 400 including a heat insulating layer in which a heat insulating material coated with a thin polymer of a low thermal conductivity is wound on a metal film having a high reflectance. 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, the inner metal pipe 300 is made of a metal material and can easily prevent heat exchange due to conduction by facilitating heat penetration into the inside thereof by conduction.

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 radiation or 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 superconducting cable according to the present invention may include at least one communication cable inside, and the communication cable may be disposed in the vacuum 500. The vacuum chamber 500 is a space provided to prevent heat from entering the core from the outside, which is a normal temperature. In the present invention, the communication cable 10 may be disposed in the spaced space. A method of installing the optical fiber in the communication cable 10 will be described later.

When the communication cable 10 is disposed in the vacuum 500 and a plurality of optical fibers are used as a communication line in the communication cable 10, a large amount of communication network can be constructed through one superconducting cable.

In order to prevent the outer metal pipe 600 and the like, which are provided on the outer side of the spacing space in the vacuum chamber 500, from contacting the heat insulating part 400 on the inner side of the vacuum chamber 500 in the entire region of the superconducting cable, At least one spacer 560 may be provided in the spacing space. The spacers 560 may be disposed along the longitudinal direction of the superconducting cable and may be disposed in such a manner as to be spirally wound on the outer side of the core unit 100.

In the embodiment shown in FIGS. 1 and 2, two spacers 560 are provided in the vacuum 500. However, the number of the spacers 560 may be increased or decreased according to the type or size of the superconducting cable.

Conventionally, the superconducting cable has three to four spacers 560 depending on the necessity or size. In the case of the superconducting cable shown in FIGS. 1 and 2, it is assumed that at least three spacers 560 have a required size.

The superconducting cable 1000 according to the present invention may have a communication cable 10 inside the superconducting cable 1000 to have a communication function in addition to the power transmission function. The superconducting cable according to the present invention includes the communication cable 10 in the vacuum 500 where the spacer 560 is provided.

As will be described later, the communication cable 10 according to the present invention can accommodate at least one or more optical fibers therein to perform the communication function and replace the spacers required for the superconducting cable.

In summary, if the number of spurs required for the superconducting cable 1000 is N, at least one to N-1 of the communication cables 10 are provided, and at least N-1 pieces of the communication cables 10 The spacer 560 and the communication cable 10 may be used together as spacing means for preventing contact between the vacuum chamber 500 and the heat insulating portion 400 in a manner of providing one to one vacuum.

The spacers 560 may be made of broad polyethylene (FEP, PFA, ETFE, PVC, P.E, PTFE).

The spacer 560 may be made of polytetrafluoroethylene (PTFE) or may be coated with a fluororesin or the like. In this case, the fluorinated polyethylene may be Teflon.

Teflon is a kind of fluorine resin. Teflon forms a very stable compound due to strong chemical bonding between fluorine and carbon, and has almost complete chemical inertness, heat resistance, non-stickiness, excellent insulation stability and low friction coefficient have. Since the Teflon has a certain degree of flexibility, it can spirally wrap the heat insulating part 400 and be disposed in a winding direction in the longitudinal direction of the superconducting cable. Since the Teflon has a certain strength, the heat insulating part 400, It can be utilized as a spacing means for preventing contact of the metal pipe 600.

An external metal pipe 600 may be provided outside the vacuum chamber 500 where the spacer 560 and the communication cable 10 are provided. 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.

In addition, a sheath 700 may be provided outside the outer metal pipe 600 to perform an external function for protecting the inside of the superconducting cable. The sheath may be made of a sheath constituting a sheath portion 700 of a conventional power cable.

FIG. 3 illustrates a communication cable included in the superconducting cable according to the present invention. 3 (a) and 3 (b) illustrate collective optical fibers 1a and 1b, which can be installed in an air blown manner in the communication cable 10, and FIG. 3 (c) and 3 (d) show the optical fiber receiving tubes 7a and 7b constituting the temperature sensing means, and Figures 3 (e) and 3 And the communication cables 10a and 10b are completed by inserting and installing the collective optical fibers into the optical fiber receiving tubes 7a and 7b shown in FIG.

As shown in Figs. 3 (a) and 3 (b), the aggregate optical fiber that can be mounted in the optical fiber receiving tube of Figs. 3 (c) and 3 (d) is composed of two optical fibers 1a, The four optical fibers 1b can be grouped. In the process of collecting a plurality of optical fibers constituting the aggregated optical fiber, the surface of the aggregated optical fiber may be coated on the surface thereof in order to minimize mounting resistance in an air blown manner.

The air blown method refers to a technique of blowing only a necessary fiber bundle into an optical fiber receiving tube by using compressed air in the process of forming an optical fiber through an optical fiber.

3 (a) shows an example in which two optical fibers 1a are composed of one collective optical fiber, and FIG. 3 (b) shows an example in which four optical fibers 1b are composed of one collective optical fiber. However, the number of optical fibers constituting one aggregated optical fiber may be larger depending on the size of the optical fiber receiving tube or the use of the optical fiber cable.

A plurality of optical fibers may be accommodated in the optical fiber receiving tubes 7a and 7b. Of course, the respective optical fibers themselves may be covered, and the optical fiber receiving tubes 7a and 7b may be pipe-shaped members for accommodating the coated optical fibers (unit optical cables). In addition, the optical fiber receiving tubes 7a and 7b may be divided into a plurality of internal spaces.

More specifically, the optical fiber receiving tubes 7a and 7b shown in Figs. 3 (c) and 3 (d) are provided with outer tubes 5a and 5b, Inner tubes 6a and 6b. The inner tubes 6a and 6b constituting the optical fiber receiving tubes 7a and 7b may be disposed inside the outer tubes 5a and 5b in advance, Can be mounted to the vacuum in the manufacturing step of the superconducting cable before being inserted and installed in the inner tubes (6a, 6b) in an air blown manner. In this way, one optical fiber receiving tube 7a, 7b can be divided into a plurality of internal spaces, and the optical fiber can be blown in if necessary during maintenance of the communication cable.

The outer tubes 5a and 5b and the inner tubes 6a and 6b constituting the optical fiber receiving tubes 7a and 7b may be made of the same material as the above described polyethylene or polytetrafluoroethylene .

In order to secure both the rigidity and flexibility as the spacing means to the pressure applied by the heat insulating portion 400 and the outer metal pipe 600 among the optical fiber receiving tubes 7a and 7b constituting the communication cable 10, The outer diameter D of the outer tubes 5a and 5b may be 5 millimeters to 7 millimeters and the thickness t of the outer tubes 5a and 5b may be 0.8 millimeters to 1.2 millimeters (mm).

The diameter of the outer tubes 5a and 5b or the number of the inner tubes is selected as necessary and the air is blown into the bundle of optical fibers through the arrangement paths of the respective inner tubes. The superconducting cable can be installed through the installation area of the superconducting cable.

In order to provide a communication function, a communication cable or an optical fiber may be disposed between the inner metal tube 300 and the heat insulating part 400 in advance during the manufacturing process of the superconducting cable, but the optical fiber receiving troughs 7a and 7b When the optical fiber receiving tubes 7a and 7b are used, the optical fiber receiving tubes 7a and 7b are mounted in the manufacturing process of the superconducting cable, and then the optical fibers are inserted into the optical fiber receiving tube by the air blown method, It is possible to adopt a method of inserting.

Since superconducting cables are heavy and considerable in thickness, they can be connected in such a way that, even when transporting and laying, the superconducting cables of limited length are transported and laid individually and connected through a connection box.

Therefore, when the communication cable is installed in advance, the communication cable must be connected to each of the connection boxes, and the communication cable including the optical fiber or the like has a large number of connection points, which increases the cost and time for installing the connection point, The possibility of moisture penetration which decreases the characteristics and the mechanical strength is increased. It is therefore desirable that the number of connection points be minimized.

When the optical fiber is inserted into the optical fiber receiving tube or the like by the air blown method in the optical path construction, the connection point between the optical fibers can be minimized, and the installation cost or time can be reduced.

Sectional views of the communication cables 10a and 10b shown in Figs. 3 (e) and 3 (f).

The optical fiber receiving tubes 7a and 7b may be disposed in a state of being accommodated in the optical fiber receiving tubes 7a and 7b performing separate external functions to prevent damage or disconnection of the optical fibers provided in the communication cable. And 7b, so that one communication cable 10a or 10b can be formed. [0050] The types of the aggregate optical fibers can be changed according to the respective inner tubes.

As shown in FIG. 3 (e) and FIG. 3 (f), the aggregate optical fiber provided in a specific inner tube may be composed of two optical fibers or may be composed of four optical fibers. Each inner tube may then be branched in a junction box or the like.

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

Therefore, in order to provide a communication function, a communication cable may be disposed in the vacuum chamber or the like having a spacing space for preventing radiation or convection from an external environment at room temperature, thereby constructing a large-capacity communication line together.

FIG. 6 is a cross-sectional view of another embodiment of a superconducting cable according to the present invention, and FIG. 7 is a cross-sectional view of another embodiment of a superconducting cable according to the present invention.

The description with reference to FIGS. 1 to 5 will be omitted. The embodiment shown in FIG. 7 shows a three-phase superconducting cable in which the number of core units 100 provided in the superconducting cable is three.

The embodiment shown in Figs. 6 and 7 differs from the embodiment shown in Figs. 1 and 4 in that a separating means for preventing contact between the heat insulating portion 400 and the outer metal pipe 600 is provided, It is an example in which only one of the spacers is employed and only the communication cable 10 is provided.

6 and 7 are superconducting cables that require at least three spacers as spacing means to prevent contact between the heat insulating portion 400 and the outer metal tube 600, Can be replaced.

Although the embodiment shown in Figs. 2 and 4 replaces some of the plurality of spacers, which may serve as spacing means, the embodiment shown in Figs. The difference is that the bulk communication network can be provided through a single superconducting cable.

Therefore, since the communication cable is disposed in the vacuum formed to block heat intrusion from the outside, which is a normal temperature, it is possible to minimize the volume increase of the superconducting cable generated by addition of the communication cable, and at the same time to provide a mass communication network.

The embodiment shown in Figs. 6 and 7 can be described as follows from another point of view. That is, the embodiment shown in Figs. 6 and 7 is an embodiment in which the communication cable 10 is used as the separation means of the vacuum 500, so that the communication cable 10 itself can be called a new type of spacer.

That is, the spacer used in the embodiment shown in FIGS. 6 and 7 may be a new spacer in the form of a twisted tube instead of a conventional solid spacer.

6 and 7, when the optical fiber or the like is inserted into the spacer, the spacer itself having the optical fiber inserted therein can provide a communication function and a separation function. In addition, The spacer can be regarded as a communication cable.

Accordingly, the present invention provides a method for cooling a core, comprising the steps of: forming a core part (100) comprising a former, a superconducting layer, an insulating layer and a superconducting shielding layer; A sheath portion 700 provided on the outer side of the vacuum chamber 500 provided on the outer side of the cooling portion for vacuum insulation of the cooling portion to form a sheath layer, A superconducting cable including at least one spacer in the form of a hollow tube disposed along the longitudinal direction of the core section (100) in the vacuum chamber (500), and at least one optical fiber inserted inside the spacer Can be provided.

Likewise, the hollow tube-shaped spacer is mounted in the superconducting cable in the manufacturing process of the superconducting cable, and the optical fiber can be inserted by an air blowing method by air pressure in a state where the superconducting cable is completely installed and connected In this case, the optical fiber may be in the form of an aggregate optical fiber in which at least two optical fibers are integrated.

Like the conventional solid spacer or optical fiber receiving tube described above, the spacer is made of a polyethylene material or a fluoropolymer material, and the outside diameter of the spacer may be 5 millimeters (mm) to 7 millimeters (mm) The thickness of the spacer may be from 0.8 millimeters (mm) to 1.2 millimeters (mm).

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
10: Communication cable
100: core part
200:
300: internal metal tube
400:
500: the jeans study
600: outer metal tube
700: Shebu

Claims (18)

At least one superconducting layer including a plurality of superconductors arranged side by side in the longitudinal direction of the former to surround the former, a superconducting layer surrounding the superconducting layer, an insulating layer surrounding the superconducting layer, At least one superconducting shield layer comprising a plurality of superconductors arranged side by side;
A cooling unit provided outside the core unit to cool the core unit, the cooling unit including a coolant channel of the liquid coolant for cooling the core unit;
A vacuum, provided outside the cooling unit, for vacuum insulation of the cooling unit, the spacer having at least one or more flexible rods;
A sheath portion provided on the outside of the vacuum chamber to form a sheath layer; And
And a communication cable in which at least one optical fiber is arranged in the longitudinal direction of the core part for constructing a light path on the resonance. The method according to claim 1,
And a heat insulating portion formed on the outer side of the cooling portion to form a heat insulating layer surrounded by an inner metal tube and a plurality of layers of heat insulating material on the outer side of the inner metal tube, Wherein the superconducting cable is provided in the superconducting cable. The method according to claim 1,
And a plurality of core portions provided inside the cooling portion are provided. The method according to claim 1,
Wherein the optical fiber is housed in the optical fiber receiving tube and is provided in the vacuum. 5. The method of claim 4,
Wherein the optical fiber receiving tube is provided with at least one inner tube in an outer tube forming an envelope, and each of the inner tubes is capable of accommodating at least one optical fiber. 5. The method of claim 4,
Wherein the optical fiber receiving tube is mounted in a superconducting cable in a manufacturing step of the superconducting cable and inserted into the superconducting cable in a state where the installation and connection of the superconducting cable is completed by a pneumatic blowing method. . 6. The method of claim 5,
Wherein the optical fiber inserted into the inner tube in the outer tube is in the form of an aggregate optical fiber in which at least two or more optical fibers are integrated. 8. The method of claim 7,
The number of the optical fibers constituting the aggregated optical fiber inserted into the at least one inner tube is different from the number of the optical fibers constituting the aggregated optical fiber inserted into the other inner tube. Superconducting cable. 6. The method of claim 5,
The outer tube and the inner tube may be made of a polyethylene material or a fluorinated polyethylene material and the outer diameter of the outer tube may be 5 mm to 7 mm and the thickness of the outer tube may be 0.8 mm ) To 1.2 millimeters (mm). A core part including a ferromagnetic material, a superconducting layer, an insulating layer and a superconducting shielding layer;
A cooling unit provided outside the core unit to cool the core unit, the cooling unit including a coolant channel of the liquid coolant for cooling the core unit;
A vacuum chamber provided outside the cooling unit for vacuum insulation of the cooling unit;
A sheath portion provided on the outside of the vacuum chamber to form a sheath layer; And
And a plurality of spacing means disposed along the longitudinal direction of the core portion in the pivoting and spaced apart from the cooling portion and the pumping portion and having at least one optical fiber and having an optical communication line function. 11. The method of claim 10,
Wherein the separating means separates the outer metal tube provided on the inner side of the sheath and the heat insulating material provided on the inner side of the vacuum chamber to separate the heat insulating portion wound in several layers. delete 11. The method of claim 10,
Wherein the spacing means comprises a tube of polyethylene material, the optical fiber being provided inside the tube. 14. The method of claim 13,
Wherein the tube comprises an outer tube and a plurality of inner tubes in the outer tube, wherein the fiber is mounted to the inner tube in an air-blown manner. A core part including a ferromagnetic material, a superconducting layer, an insulating layer and a superconducting shielding layer;
A cooling unit provided outside the core unit to cool the core unit, the cooling unit including a coolant channel of the liquid coolant for cooling the core unit;
A vacuum chamber provided outside the cooling unit for vacuum insulation of the cooling unit;
A sheath portion provided on the outside of the vacuum chamber to form a sheath layer; And
At least one spacer in the form of a hollow tube disposed along the longitudinal direction of the core portion to the pivoting;
And at least one optical fiber inserted into the spacer to provide an optical communication line function. 16. The method of claim 15,
Wherein the spacer is mounted in a superconducting cable in a manufacturing step of the superconducting cable, and the optical fiber is inserted in an air blown manner by air pressure in a state where the superconducting cable is installed and connected. 17. The method of claim 16,
Wherein the optical fiber is a collective optical fiber in which at least two optical fibers are integrated. 17. The method of claim 16,
The spacer may be made of a polyethylene material or a fluorinated polyethylene material and the outer diameter of the spacer may be from 5 mm to 7 mm and the thickness of the spacer may be from 0.8 mm to 1.2 mm ). ≪ / RTI >

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