KR102608512B1 - Superconducting Cable And Manufacturing Method Of The Same - Google Patents

Abstract

The present invention divides the vacuum section for vacuum insulating the cooling section of the superconducting cable into a plurality of vacuum sections in the longitudinal direction of the superconducting cable, evacuates the section area itself to minimize heat intrusion and heat transfer through the section area, and evacuates the vacuum section of the superconducting cable. When the vacuum is released or destroyed, the work time and cost required to re-vacuum the vacuum can be greatly reduced, and the superconducting cable has a vacuum partition device that allows the main function of the superconducting cable to be quickly implemented. It's about the manufacturing method.

Description

Superconducting cable and manufacturing method of superconducting cable {Superconducting Cable And Manufacturing Method Of The Same}

The present invention relates to a superconducting cable and a method of manufacturing the superconducting cable. More specifically, the present invention divides the vacuum section for vacuum insulating the cooling section of the superconducting cable into a plurality of sections in the longitudinal direction of the superconducting cable, and vacuumizes the section area itself to minimize heat intrusion and heat transfer through the section area, thereby forming a superconducting cable. When the vacuum part of the cable's vacuum part is released or destroyed, the work time and resulting costs required to re-vacuum the vacuum part can be greatly reduced, and it is equipped with a vacuum part partition device that allows the main function of the superconducting cable to be quickly implemented. It relates to a superconducting cable and its manufacturing method.

Cryogenic cooling technology is widely used and researched in a variety of fields, including power transmission technology using superconductors, medical technology, basic nuclear fusion technology, and satellite-related technology.

A widely used cryogenic cooling method is a method in which a cooling unit is provided for cooling using a refrigerant such as liquid nitrogen circulating on the outside of a cooling container containing the object to be cooled, and a vacuum unit for vacuum insulation is provided on the outside of the cooling unit. You can.

Superconducting power systems have the advantage of being able to transmit large amounts of current even at relatively low voltages by using the characteristic that the resistance of superconductors converges to zero at extremely low temperatures.

In order to create superconducting conditions for the superconductors that make up the superconducting cable, a cryogenic environment in the core containing the superconductors must be guaranteed.

Therefore, in order to form a cryogenic temperature, which is the superconductivity condition of a superconductor, the superconducting cable flows cryogenic liquid refrigerant through a cooling part in the form of a cooling channel on the outside of the core part, and further forms a vacuum part on the outside of the cooling channel to vacuum insulate the cooling part. By preventing heat intrusion from the outside, the extremely low temperature state of the core part equipped with the superconducting conductor can be stably maintained.

A method of forming a vacuum inside a superconducting cable secures a separation space capable of forming a vacuum, and provides a plurality of spacers inside the space to physically prevent the inner and outer surfaces of the separation space from contacting each other, A method of vacuuming the separation space may be used.

The operation of vacuuming the vacuum part can be performed by pumping the empty space inside the external metal tube of the superconducting cable using a pump or the like.

In addition, a sensor for measuring the temperature of the cooling part may be mounted on the surface of the inner metal tube, etc., and for the failure or maintenance of the sensor, the vacuum in the vacuum part is artificially released or the external metal tube is damaged and the vacuum state in the vacuum part is destroyed. In this case, a vacuum must be created again in the vacuum area, but the vacuuming process to restart the superconducting power system can take 1 to 2 weeks in proportion to the unit installation length bordering the junction box, so it is a major weakness as a power system. do.

The present invention divides the vacuum section for vacuum insulating the cooling section of the superconducting cable into a plurality of vacuum sections in the longitudinal direction of the superconducting cable, evacuates the section area itself to minimize heat intrusion and heat transfer through the section area, and evacuates the vacuum section of the superconducting cable. When the vacuum is released or destroyed, the work time and cost required to re-vacuum the vacuum can be greatly reduced, and the superconducting cable has a vacuum partition device that allows the main function of the superconducting cable to be quickly implemented. The problem to be solved is to provide a manufacturing method.

In order to solve the above problem, the present invention includes a core portion sequentially provided with a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer; In order to cool the core part, it is provided outside the core part to form a cooling part through which cryogenic refrigerant flows, and a plurality of metal tubes are provided on the outside of the inner metal tube of the corrugation structure in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. A partition device installation step of inserting and installing two ring-shaped vacuum partition devices; A partition device bonding step of arranging and bonding the vacuum partition device installed in the partition device installation step to the outside of the inner metal pipe at predetermined intervals; An external metal tube forming step of forming a metal plate around the outside of the inner metal tube to which the vacuum partition device is joined in the partition device bonding step to form a corrugation structure in which grooves and ridges are repeated in a spiral shape on the surface; An external metal tube cutting step of cutting and removing the vacuum partition device area of the external metal tube to expose the vacuum partition device among the external metal tubes formed in the external metal tube forming step; And, a vacuum partition finishing step of finishing both ends of the external metal tube cut in the external metal tube cutting step and the vacuum partition device with a finishing member that partitions the vacuum partition device. A superconducting cable comprising a. Manufacturing methods can be provided.

Additionally, the vacuum partition device installed in the partition device installation step may be installed on the outer peripheral surface of the inner metal pipe in an unfixed state.

In addition, the partition device bonding step may be performed before winding the inner metal pipe onto the drum.

Here, after the step of joining the partition device, each vacuum partition device can be wrapped with a protective cap after joining the vacuum partition device.

Additionally, the external metal tube forming step may be performed after unfolding the internal metal tube in a straight line in the drum.

In this case, in the finishing step of the partition device, the vacuum partition device may be performed by connecting the outer surface of the inner metal tube and the ends of the divided pair of outer metal tubes.

In addition, the partition device finishing step may be performed by joining the ends of the pair of external metal tubes and the outer peripheral surface of the vacuum partition device with a finishing member constituting the vacuum partition device.

Here, the finishing step of the partition device may be performed by wrapping and connecting the end of the external metal pipe and the outer peripheral surface of the vacuum partition device with a finishing member of a corrugated corrugated structure divided at 180 degrees in the circumferential direction.

Additionally, in order to solve the above problems, the present invention can provide a superconducting cable manufactured by the above-described superconducting cable manufacturing method.

In addition, in order to form its own vacuum section, a chamber member surrounding the vacuum section dividing device and each joined to the outer surface of the divided external metal tube may be further provided.

According to the superconducting cable and the manufacturing method of the superconducting cable according to the present invention, the vacuum section for vacuum insulating the cooling section of the superconducting cable can be divided into a plurality of parts in the longitudinal direction of the superconducting cable.

Therefore, according to the superconducting cable and the manufacturing method of the superconducting cable according to the present invention, the work time and resulting costs for releasing the vacuum in the vacuum part for maintenance of the superconducting cable or re-vacuuming the vacuum part when the vacuum is broken are reduced. It can be greatly shortened.

In addition, according to the superconducting cable and the manufacturing method of the superconducting cable according to the present invention, in the process of manufacturing the superconducting cable, an internal metal tube is installed outside the core, and then a vacuum partition device is inserted and installed, and then the superconducting cable in the form of an internal metal tube is placed on the drum. Damage to the vacuum compartment device can be prevented even when winding.

In addition, according to another embodiment of the superconducting cable and the manufacturing method of the superconducting cable according to the present invention, the vacuum partition device itself is provided with a chamber member to form a vacuum region to minimize heat intrusion from the outside through the vacuum partition device. can do.

Figure 1 shows a perspective view of the end of the superconducting cable of the present invention with multiple stages removed, and Figure 2 shows a cross-sectional view of the superconducting cable shown in Figure 1.
Figure 3 shows a perspective view of a vacuum partition device according to one embodiment installed in the superconducting cable of the present invention, and Figure 4 shows a cross-sectional view of the superconducting cable shown in Figure 3 with the core part removed.
Figure 5 shows a state in which the partition device installation step in the method of manufacturing a superconducting cable according to the present invention is completed.
Figures 6 and 7 show the process of winding the inner metal tube with a protective cap installed on a drum on each vacuum partition device where the partition device bonding step has been performed in the method of manufacturing a superconducting cable according to the present invention.
Figures 8 to 10 show the external metal tube forming step for forming an external metal tube outside the internal metal tube on which the partition device joining step has been performed in the method of manufacturing a superconducting cable according to the present invention.
Figure 11 shows a state in which the external metal tube cutting step of cutting and removing the vacuum partition device area of the formed external metal tube in the external metal tube forming step of the method of manufacturing a superconducting cable according to the present invention is performed.
FIG. 12 shows a vacuum section closure in which both ends of a divided external metal pipe in which the external metal pipe cutting step is performed in the method of manufacturing a superconducting cable according to the present invention and the vacuum section dividing device are finished with a finishing member that divides the vacuum section dividing device. It shows the state in which the step has been performed.
Figure 13 shows a perspective view of a vacuum partition device according to another embodiment installed in the superconducting cable of the present invention, and Figure 14 shows a cross-sectional view of the superconducting cable shown in Figure 13 with the core part removed.
Figure 15 shows a perspective view of a vacuum partition device according to another embodiment installed in the superconducting cable of the present invention, and Figure 16 shows a cross-sectional view of the superconducting cable shown in Figure 15 with the core part removed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure will be thorough and complete, and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout the specification.

Figure 1 shows a perspective view of the end of the superconducting cable 100 of the present invention with multiple stages removed, and Figure 2 shows a cross-sectional view of the superconducting cable shown in Figure 1.

The superconducting cable 1000 includes a former 110 from the inside to the outside, and a plurality of superconductors arranged side by side in the longitudinal direction of the former 110 to surround the outside of the former 110. It includes a conductor layer 130, an insulating layer 140 surrounding the superconducting conductor layer 130, and a plurality of superconductors arranged side by side in the longitudinal direction of the former 110 to surround the outside of the insulating layer 140. A core portion 100 including at least two layers of superconducting shielding layer 180, and a core portion 100 provided on the outside of the core portion 100 to cool the core portion 100. A cooling unit 200 having a refrigerant flow path for liquid refrigerant for cooling, an internal metal tube 300 provided on the outside of the cooling unit 200, and an internal metal tube 300 provided on the outside, the insulation material 401 is provided in various ways. An insulating part 400 forming a layer-wrapped insulating layer, a vacuum part provided with a plurality of spacers 560 at spaced apart positions outside the insulating part 400 to vacuum insulate the cooling part 200 ( 500), an external metal pipe 600 provided outside the vacuum unit 500, and a cable jacket 700 provided outside the external metal pipe 600.

Each component that makes up a superconducting cable will be reviewed sequentially as follows. The former 110 provides a place to mount a flat and long superconductor around the former 110, serves as a frame for forming a shape, and can become a path through which a fault current flows. The former 110 may have a shape in which a plurality of copper (Cu) wires 111 having a circular cross-section are compressed into a circular shape.

Since several strands of copper (Cu) wires 111 with circular cross sections constituting the former 110 are compressed into a circular shape to form a stranded wire, its surface is bound to be convex. Accordingly, in order to smooth the convex surface of the former 110, a smoothing layer 120 may be coated on the outside of the former 110. The smooth layer 120 may be made of a material such as semiconducting carbon paper or brass tape.

A first superconducting conductor layer 130a formed by being surrounded by a plurality of superconductors may be provided on the outside of the former 110 that is flattened by the smoothing layer 120. The first superconducting conductor layer 130a may be installed so that a plurality of superconductors are adjacent to each other and surround the smooth layer 120. Additionally, as shown in FIG. 2, the superconducting conductor 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 FIGS. 1 and 2 is shown to be provided with a total of two superconducting conductor layers 130a and 130b. Additionally, if the superconducting conductor layers are simply stacked, the current capacity does not increase due to the skin effect of the current. To prevent this problem, when the superconducting conductor layer is provided in multiple layers, an insulating layer 140 may be provided between the superconducting conductor layers 130a and 130b. The insulating layer 140 may be configured in the form of an insulating tape, and is disposed between the stacked superconducting conductor layers 130a and 130b to insulate the superconducting conductor layers 130a and 130b from each other to prevent the skin effect of the stacked superconductors. can do.

In the embodiment shown in FIGS. 1 and 2, the superconducting conductor layer 130 is shown as an example composed of two layers, a first superconducting conductor layer 130a and a second superconducting conductor layer 130b, but may be added as needed. A layer of superconducting conductor may also be provided.

In addition, the superconductors constituting each superconducting conductor layer 130a and 130b may be connected in parallel with each wire constituting the former 110. This is to ensure that the current flowing through the superconductor flows into the wire of the former 110 in the event of an accident such as destruction of the superconducting condition. If the superconductivity conditions are not satisfied in this way, the resistance of the superconductor increases and the resulting heat generation or damage to the superconductor is prevented.

An internal semiconducting layer 150 may be provided outside the second superconducting conductor layer 130b provided outside the first superconducting conductor layer 130a. The internal semiconducting layer 150 may be provided to alleviate electric field concentration in each region of the superconducting conductor layer 130 and even out the surface electric field. The internal semiconducting layer 150 may be provided by winding a semiconducting tape.

An insulating layer 160 may be provided outside the internal semiconducting layer 150. The insulating layer 160 may be provided to increase the dielectric strength of the superconducting cable. Generally, XLPE (Cross Linking-Polyethylene) or oil filled cables are used to insulate high-voltage cables. However, superconducting cables are cooled to extremely low temperatures for superconductivity, and at extremely low temperatures, XLPE is damaged and the insulation is destroyed. Since oil-filled cables may cause environmental problems, the superconducting cable according to the present invention can use insulating paper made of general paper as the insulating layer 160, and the insulating layer 160 It can be configured by winding the insulating paper multiple times.

An external semiconducting layer 170 may be provided outside the insulating layer 160. The outer semiconducting layer may also be provided to alleviate the concentration of electric fields in each region of the superconducting conductor layer 130 and even out the surface electric field, and the outer semiconducting layer 170 may also be provided in a manner in which a semiconducting tape is wound. .

Additionally, a superconducting shielding layer 180 may be provided outside the external semiconducting layer 170. The method of forming the superconducting shielding layer 180 may be the same as the method of forming the superconducting conductor layer 130. If the surface of the external semiconducting layer 170 is uneven, a smoothing layer (not shown) may be provided as needed, and the superconductors to form the superconducting shielding layer 180 outside the smoothing layer are placed in the circumferential direction. They can be placed side by side.

A core exterior layer 190 that serves as the exterior of the core portion 100 may be provided outside the superconducting shielding layer 180. The core exterior layer 190 may include various tapes or binders, and may serve as an exterior so that the core portion 100 is exposed to a cooling layer to be described later.

In this way, the core portion 100 of the superconducting cable can be constructed. In FIGS. 1 and 2, the smooth layer and the semiconducting layer are shown as being composed of a single layer of the same material, but various auxiliary layers can be used as necessary. may be added.

A 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 circulation path for liquid refrigerant inside the cooling unit 200. Liquid nitrogen may be used as the liquid refrigerant, and the liquid refrigerant (liquid nitrogen) circulates through the coolant passage in a cooled state to have a temperature of about -200 degrees, and the superconductor provided in the core part inside the cooling unit It is possible to maintain extremely low temperatures, which are conditions for superconductivity.

The cooling passage provided in the cooling unit 200 can allow liquid refrigerant to flow in one direction, and can be recovered from a connection box of a superconducting cable, etc., re-cooled, and supplied again to the cooling passage of the cooling unit 200.

An internal metal tube 300 may be provided outside the cooling unit 200. The inner metal pipe 300, together with the outer metal pipe 600, which will be described later, serves as the exterior of the superconducting cable to prevent mechanical damage to the core portion 100 during installation and operation of the superconducting cable. Superconducting cables are wound around a drum for easy manufacturing and transportation. When installing, the cable wound around the drum is deployed and installed, so bending or tensile stress can be continuously applied to the superconducting cable.

In order to maintain initial performance even in situations where such mechanical stress is applied, an internal metal tube 300 may be provided. Therefore, the inner metal tube 300 has a corrugated structure in which rises and depressions are repeated in the longitudinal direction of the superconducting cable to reinforce rigidity against mechanical stress, and the inner metal tube 300 is made of a material such as aluminum. It can be.

Since the internal metal tube 300 is provided outside the cooling unit 200, it may be at a very low temperature corresponding to the temperature of the liquid refrigerant. Accordingly, the inner metal tube 300 can be classified as a low-temperature metal tube.

In addition, an insulating portion 400 may be provided on the outer peripheral surface of the inner metal tube 300, including an insulating layer in which several layers of insulating material are thinly coated with a high-reflectivity metal film and a polymer with low thermal conductivity. The insulation layer constitutes multi-layer insulation (MLI, Multi Layer Insulation) and can minimize heat transfer mainly by radiation.

Therefore, the effect of preventing heat exchange or heat intrusion due to radiation can be obtained due to the metal film material with high reflectivity.

A vacuum unit 500 may be provided outside the insulation unit 400. The vacuum unit 500 is provided to minimize heat transfer due to convection in the direction of the insulation layer, which may occur when the insulation by the insulation unit 400 is insufficient.

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

The vacuum unit 500 is a separation space provided to prevent heat intrusion from the outside, which is at room temperature, into the core unit due to convection, etc., and may be provided with at least one spacer 560 to form a physical separation space. The separation space within the vacuum unit 500 is used to prevent the entire area of the superconducting cable from coming into contact with the external metal pipe 600 provided outside the vacuum unit 500 and the insulation unit 400 inside the vacuum unit 500. At least two spacers 560 may be provided within. The spacer 560 may be arranged along the longitudinal direction of the superconducting cable, and may be wound to spirally surround the outside of the core portion 100, specifically, the insulation portion 400.

As shown in FIG. 1, a plurality of spacers 560 may be provided, and the number of spacers 560 may increase or decrease depending on the type or size of the superconducting cable. The superconducting cable according to the present invention may be provided with 3 to 5 spacers.

An external metal tube 600 may be provided outside the vacuum unit 500 where the spacer 560 is provided. The external metal tube 600 may be made of the same shape and material as the internal metal tube 300, and the external metal tube 600 may be made of a larger diameter than the internal metal tube 300, so that it can be formed through the spacer 560. It may be possible to form a separation space.

The vacuum part 500 of the conventionally introduced superconducting cable is configured to minimize heat intrusion due to convection by vacuuming the inside, and the vacuum part 500 is a partition in the laying section of the superconducting cable connecting the intermediate or terminal junction boxes. It was not made up, but was composed as one.

Therefore, if the external metal pipe 600 dividing the vacuum section 500 in one installation section is damaged or the vacuum state of the vacuum section 500 is released for maintenance in some sections of the installation section, the entire installation section The vacuum state of the vacuum part 500 is released together.

Therefore, after the damaged part or internal maintenance of the superconducting cable is completed, the vacuum part 500 is vacuumized again by a method such as suction for a long time in order to vacuum the vacuum part 500 to about 10-5 Torr. The vacuuming work of the study 500 is often performed for more than a week in proportion to the length of the laying section.

In order to solve this problem, the present invention provides a vacuum partition device for partitioning or dividing the vacuum part of one superconducting cable into a plurality of parts, so that vacuum release of the vacuum part can be performed in each section. The explanation for this will be postponed later.

In addition, a cable jacket 700 that performs an external function to protect the inside of the superconducting cable may be provided outside the external metal tube 600. The cable jacket 700 may be made of a sheath material constituting a typical power cable jacket 700.

Figure 3 shows a perspective view of a vacuum partition device according to one embodiment installed on the superconducting cable of the present invention.

As described above, in order to maintain the cryogenic environment inside the core part, the superconducting cable flows a cryogenic liquid refrigerant inside the inner metal tube 300 and has an insulation part 400 composed of wrapping insulation around the outside of the inner metal tube 300. A structure is adopted to prevent external heat intrusion by providing a vacuum part 500 to insulate the outside of the insulating part from vibration.

The present invention is provided with a vacuum section dividing device 900 so that the vacuum section 500 can be divided into a plurality in one installation section of a superconducting cable.

As shown in FIG. 3, the vacuum section partition device 900 can be mounted between the external metal tubes 600 inside which the vacuum section 500 of the superconducting cable of the present invention is provided, and is pre-installed in the longitudinal direction of the superconducting cable. The vacuum portion 500 of one superconducting cable that is installed at determined intervals and connects connection boxes can be divided or partitioned into a plurality of pieces.

Hereinafter, the structure of the superconducting cable vacuum section partition device 900 according to the present invention will be described in detail.

FIG. 4 shows a cross-sectional view of the superconducting cable equipped with the vacuum partition device shown in FIG. 3 with the core portion removed.

The present invention includes a core portion (not shown) in which a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer are sequentially provided; In order to cool the core part, it is provided on the outside of the core part to form a cooling part 200 through which cryogenic refrigerant flows, and the interior of the corrugation structure in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. Metal pipe (300); In order to vacuum insulate the inner metal tube 300, a vacuum portion 500 in a vacuum state is formed outside the inner metal tube 300, and a core in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. External metal pipe (600) of gating structure; The external metal tube 600 is divided at predetermined intervals, and is mounted between the divided external metal tubes 600 to divide the vacuum part 500 inside the external metal tube 600 in the longitudinal direction of the superconducting cable. A superconducting cable including a device 900 may be provided.

The vacuum partition device 900 provided in the superconducting cable according to the present invention is mounted on the outer surface of the inner metal tube 300 constituting the cooling part 200, and is divided into two outer metal tubes ( 600).

In order to install the vacuum partition device 900, the external metal tube 600 is divided at predetermined intervals, and the vacuum partition device 900 can be installed between the divided external metal tubes 600. .

Since the vacuum section dividing device 900 is a device for dividing the vacuum section 500, airtightness must be guaranteed in the direction of the divided vacuum section 500 and the internal metal pipe 300.

In addition, since both the inner metal tube 300 and the outer metal tube 600 can be composed of a metal tube structure with repeated valleys and ridges for bending rigidity, etc., the vacuum partition device 900 is connected to the inner metal tube 300. ) It is mounted on the outer surface, and a metal sheet 910 may be installed on the outer circumferential surface of the inner metal tube 300 to flatten the outer circumferential surface of the inner metal tube 300 in order to easily ensure airtightness.

The metal sheet 910 may be mounted on the inner metal tube 300 to flatten the outer peripheral surface of the inner metal tube 300, and the insulation member 920 may be mounted on the metal sheet 910.

The metal sheet 910 may be welded and installed to connect the top of the ridge of the internal metal pipe 300.

Since the internal metal pipe 300 is provided with a cooling part 200 in which cryogenic liquid refrigerant flows, even if the vacuum partition device 900 partitions the vacuum part 500, the vacuum partition device 900 External heat intrusion must be minimized.

Accordingly, the vacuum partition device 900 may further include an insulating member 920 mounted on the outer surface of the metal sheet 910 attached to the inner metal tube 300.

The insulation member 920 may be made of a non-metallic material with excellent thermal insulation effect.

The insulation member 920 may be made of fluorocarbon resin. Specific examples include PTFE (Poly Tetra Fluoro Ethylene) or PCTFE (Poly Chloro Tri Fluoro Ethylene).

PTFE is a chemically inert material and can be applied even in cryogenic environments, has a very low coefficient of friction, and has excellent electrical insulation properties. PCTFE has excellent mechanical properties and superior gas shielding properties compared to PTFE. Therefore, an appropriate material can be selected and applied depending on the shape of the insulation member 920.

A cover member 940 may be mounted on the insulation member 920. The cover member 940 prevents damage to the insulation member 920 when the insulation member 920 is exposed to the outermost part, and attaches the finishing member 950 or corrugated finishing member 950, which will be described later, to the insulation member 920. It is an additional component because it cannot be welded directly.

The cover member 940 may also be made of a metal material.

In addition, in order to prevent vacuum from being lost through the minute gap between the metal sheet 910 and the cover member 940 mounted on the inner and outer surfaces of the insulating member 920, the inner surface of the insulating member 920 and the metal At least one sealing member 930 may be provided to seal between the outer surface of the sheet 910 or between the outer surface of the insulation member 920 and the inner surface of the cover member 940.

The sealing member 930 is configured in the form of an O-ring and is seated in a seating groove formed on the inner or outer surface of the insulating member 920 to maintain airtightness between the metal sheet 910 or the cover member 940 and the insulating member 920. can be guaranteed.

The sealing member 930 may be configured to maintain continuous elasticity to compensate for dimensional shrinkage at extremely low temperatures. For example, by inserting a highly elastic spring into a fluororesin or coating it with a fluororesin, it is desirable to ensure that the surface properties have the general characteristics of a fluororesin, but that mechanical properties such as contractile force are similar to those of a spring.

As shown in FIG. 4, each sealing member 930 is shown as being provided in two pieces at positions corresponding to the inner and outer surfaces of the insulating member 920, but the number can be increased or decreased as needed.

In addition, the vacuum partition device 900 according to the present invention is mounted on the outer surface of the inner metal tube 300 provided with the cooling part 200 therein, and includes a vacuum part for vacuum insulating the cooling part 200 of the superconducting cable. Since the structure divides the 500 into a plurality of parts, the external metal pipe 600 can be divided with the vacuum partition device 900 as a boundary.

That is, each of the divided external metal pipes 600 is provided with an independent vacuum section 500 on the inside by the vacuum section dividing device 900.

The vacuum portion 500 of the superconducting cable is constructed by vacuuming the space formed between the outer surface of the inner metal tube 300 and the inner surface of the outer metal tube 600. Therefore, in order to partition the vacuum portion 500, the divided outer metal tube 600 is used. Both ends of the and the vacuum partition device 900 must be connected to finish in an airtight state.

For this purpose, a finishing member 950 may be provided to connect both ends of the divided external metal pipe 600 and the vacuum partition device 900.

The finishing member 950 may be mounted by connecting the outer surface of the cover member 940 constituting the vacuum partition device 900 with both ends of the divided external metal pipe 600.

As shown in FIG. 4, the finishing member 950 may be composed of a ring-shaped member with an 'ㄱ' cross-sectional shape, but its shape may be changed in various ways.

The finishing member 950 is fixed by welding along the circumferential direction to the outer surface of the cover member 940 constituting the vacuum partition device 900 and both ends of the divided external metal pipe 600. The vacuum section 500 can be divided.

Such a vacuum section dividing device 900 can easily maintain the vacuum state of the superconducting cable line by dividing the vacuum section of the superconducting cable into a plurality of parts. However, since the vacuum partition device 900 is mounted between the inner metal tube 300 and the divided outer metal tubes 600a and 600b, it must be installed after manufacturing the inner metal tube 300, and the outer metal tube 600 is also installed between the inner metal tubes 600a and 600b. Like (300), it has a corrugated structure with valleys and ridges, so a forming process is required. However, since the external metal pipe 600 is divided and configured, a specific manufacturing method is reviewed.

The method of manufacturing a superconducting cable according to the present invention can be applied by installing the vacuum partition device 900 on the outside of the core by forming the inner metal tube 300 by a method such as forming. Review in detail.

The method of manufacturing a superconducting cable according to the present invention is to cool the core portion by forming a cooling portion provided on the outside of the core portion through which a cryogenic refrigerant flows, and valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. A partition device installation step of inserting and installing a plurality of ring-shaped vacuum partition devices (900) on the outside of the internal metal pipe (300) of the corrugation structure; A partition device bonding step of arranging and bonding the vacuum partition device 900 installed in the partition device installation step to the outside of the inner metal pipe 300 at predetermined intervals; An external metal tube forming step of wrapping a metal plate around the outside of the internal metal tube 300 to which the vacuum partition device 900 is joined in the partition device bonding step and forming a corrugation structure in which grooves and ridges are repeated in a spiral shape on the surface; An external metal tube cutting step of cutting and removing the vacuum partition device region 600c of the external metal tube 600 so that the vacuum partition device 900 of the external metal tube 600 formed in the external metal tube forming step is exposed. ; And, a vacuum partition finishing step of finishing both ends of the external metal tube 600 cut in the external metal tube cutting step and the vacuum partition device 900 with a finishing member that partitions the vacuum partition device 900; It can be configured to include.

Each process is explained in detail.

Figure 5 shows a state in which the partition device installation step in the method of manufacturing a superconducting cable according to the present invention is completed.

As described above, the core portion of the superconducting cable may be equipped with an internal metal tube 300 on the outside to form a cooling portion. The inner metal tube 300 may be bonded after wrapping a core portion with a metal plate, and a forming process may be performed to form a corrugation structure to strengthen bending characteristics.

The superconducting cable in the form of an internal metal tube 300 completed by performing this forming process may be continuously subjected to subsequent processes, but may be wound on a drum (d), etc. for subsequent processes when manufacturing a long coil.

Accordingly, the vacuum partition device 900' mounted on the outer peripheral surface of the internal metal tube 300 can be inserted into the outside of the internal metal tube 300 and then joined at predetermined intervals. Reference numeral 900' of the vacuum partition device refers to its state before being joined to both divided external metal pipes.

The vacuum partition device 900' is configured in a ring shape, and a plurality of vacuum partition devices 900' may be mounted on the outside of the internal metal tube 300 in a non-fixed state.

Figures 6 and 7 show the inner metal tube 300 with the protective cap (c) installed in each vacuum partition device (900') in which the partition device bonding step was performed in the method of manufacturing a superconducting cable according to the present invention, on the drum. The winding process is shown.

The plurality of vacuum partition devices 900' installed in the partition device installation step may be installed in an unfixed state, and the vacuum partition devices 900' may be pre-installed on the outside of the internal metal pipe 300 before being wound on a drum, etc. The partition device bonding step of arranging and bonding at determined intervals may be performed.

When the vacuum section dividing device 900' is joined to the outside of the inner metal tube 300, the position of each vacuum section dividing device 900' is fixed, so the vacuum section is It is desirable to bond the partition devices 900' at predetermined intervals.

In this case, in order to prevent damage to each vacuum partition device 900', the protective cap c made of plastic, etc. can be wound on the drum while attached to the bonded vacuum partition device 900'. .

8 to 10 show the external metal tube forming step for forming the external metal tube 600 outside the internal metal tube 300 on which the partition device joining step has been performed in the method of manufacturing a superconducting cable according to the present invention.

Like the inner metal tube 300, the outer metal tube 600 may also be subjected to a forming process after wrapping and joining the inner metal tube 300 with a metal plate 600p.

As described above, after the forming process of the internal metal tube 300 is completed, it is wound around a drum (d) and waits for the subsequent process. For the subsequent process, the internal metal tube 300 wound around the drum (d) as shown in FIG. ) must be developed in a straight line.

In addition, in the external metal tube forming step of forming the external metal tube 600, as shown in FIG. 9, the protective cap (c) for protecting the vacuum partition device 900' wound on the drum can be removed. .

The protective cap (c) is removed, and the vacuum partition device 900 wraps and joins the inner metal tube 300 joined at predetermined intervals with a metal plate 600p for forming the outer metal tube 600, and then uses a forming machine ( f), it is possible to form a corrugation structure in which valleys and ridges are formed in a spiral shape on the outer peripheral surface of the external metal pipe 600.

As explained with reference to FIGS. 3 and 4, the vacuum section dividing device 900' is a device for dividing the vacuum section formed by the external metal pipe 600 into a plurality of parts, and divides the external metal pipe 600 into a plurality of pieces. and has a structure that connects the ends of the divided external metal pipes 600a and 600b to each other.

Therefore, after forming the external metal tube 600 outside the internal metal tube 300 to which the vacuum partition device 900' is joined, the external metal tube 600 must be cut along the vacuum partition device 900. .

In addition, the vacuum partition device area 600c is a part to be cut, and in order to prevent damage to the vacuum partition device 900' during the forming process, the vacuum partition device area 600c is cut as shown in FIG. 11. must be configured to pass through the forming device without performing the forming process.

Figure 11 shows the external metal tube cutting step of cutting and removing the vacuum partition device area 600c of the external metal tube 600 formed in the external metal tube forming step in the method of manufacturing a superconducting cable according to the present invention.

When the vacuum partition device area 600c of the external metal tube 600 is cut, the vacuum partition device 900 disposed inside is exposed, and the external metal tube 600 can be divided, as shown in FIG. 11. there is.

Since the vacuum part inside the external metal tube 600 is divided by the vacuum partition device 900', the external metal tube 600a is divided after cutting the vacuum partition device area 600c of the external metal tube 600, 600b) and the vacuum partition device (900') must each be sealed and closed.

Figure 12 shows both ends of the divided external metal tubes 600a and 600b on which the external metal tube cutting step was performed in the method of manufacturing a superconducting cable according to the present invention and the vacuum partition device 900'. It shows the vacuum section finishing step of finishing with a finishing member (see 950 in FIG. 4) that divides the section.

In the partition device finishing step, the vacuum partition device 900' may be performed by connecting the outer surface of the inner metal tube 300 and the divided ends of the pair of external metal tubes 600, and the partition In the device finishing step, the end of the pair of external metal tubes 600 and the outer peripheral surface of the vacuum partition device 900 can be joined with a finishing member constituting the vacuum partition device 900'. .

The finishing member may be configured in a ring shape and installed in the partition device installation step described above, or may be configured in a divided ring shape and installed in the partition device finishing step.

The finishing member may be a finishing member having an 'ㄱ' shaped cross section as shown in FIGS. 3 and 4, but its shape may be changed in various ways.

However, during the external metal pipe forming step, the external metal pipe cutting step, and the vacuum section finishing step to construct the external metal pipe 600 described with reference to FIGS. 8 to 12, the external metal pipe cutting step to remove the vacuum partition device area 600c is performed. At this stage, there is a risk that the vacuum partition device 900' located therein may be damaged. Therefore, in order to prevent damage to the vacuum partition device 900' that may occur during the process of cutting the external metal tube, a method of removing each external metal tube 600 to a sufficient extent can be applied.

In this case, the finishing member for finishing the vacuum partition device 900' must be constructed to have a longer length or width than the finishing member having an 'ㄱ'-shaped cross section referring to FIGS. 3 and 4. This will be described with reference to FIGS. 13 and 14.

Figure 13 shows a perspective view of a vacuum partition device according to another embodiment installed in the superconducting cable of the present invention, and Figure 14 shows a cross-sectional view of the superconducting cable shown in Figure 13 with the core part removed.

Descriptions that overlap with those referring to FIGS. 1 to 12 will be omitted.

In the superconducting cable, a cooling part 200 forming a cooling passage and a vacuum part 500 for vacuum insulation are provided inside the inner metal tube 300 and the outer metal tube 600, respectively, and the inner metal tube 300 and the outer metal tube ( 600) has a corrugation structure provided with valleys and ridges for bending characteristics, etc. Therefore, bending during bending of the superconducting cable is prevented and bending rigidity is increased.

However, as shown in Figures 3 and 4, when the outer metal pipe 600 is divided and the vacuum partition device 900 is mounted on the outer surface of the inner metal tube 300, the vacuum partition device 900 is installed in the installation area. The bending characteristics or flexibility may deteriorate, so to compensate for this and prevent damage to the vacuum partition device 900' inside during the process of cutting the external metal tube as described above, a corrugated finishing member as shown in FIG. 13 is used. can be applied.

The corrugated finishing member may be mounted in the same position as the finishing member of the above-described embodiment, but may be configured as a corrugation structure having valleys and ridges similar to the structure of the external metal pipe 600.

Additionally, the corrugated finishing member may be provided in a half-split state to improve fitability when mounted in the finishing position. That is, the left and right barging members may be composed of a first finishing member (950a) and a second finishing member (950b) divided into upper and lower parts, respectively. Therefore, a finishing member in the form of four pipes divided by 180 degrees can be applied to connect and finish one vacuum partition device 900' and an external metal pipe.

Therefore, in order to finish the left and right sides of the vacuum partition device 900', the first finishing member 950a and the second finishing member 950b are installed and then respectively connected to the external metal pipe, and the first finishing member ( The boundary area of 950a) and the second finishing member 950b also requires bonding.

In particular, the interval between the valleys and ridges formed on the surface of the corrugated finishing members (950a, 950b) is smaller than the interval between the valleys and ridges of the inner metal pipe 300 or the outer metal pipe 600, or the corrugated finishing members ( The thickness of the metal constituting 950a, 950b) is smaller than the thickness of the inner metal tube 300 or the outer metal tube 600, so that the rigidity of the corrugated finishing member 950 itself is reduced by the outer metal tube 600 and the inner metal tube. By lowering it to (300), it is possible to partially compensate for the deterioration of bending characteristics in the installation area of the vacuum partition device (900).

Like the external metal tube 600 and the internal metal tube 300, the corrugated finishing member 950 may also be made of aluminum, stainless steel, or an alloy thereof.

In addition, the corrugated finishing members 950a and 950b can also be joined to the cover member 940 or the external metal pipe 600 by welding or other methods to ensure airtightness.

Figure 15 shows a perspective view of a vacuum partition device according to another embodiment installed in the superconducting cable of the present invention, and Figure 16 shows a cross-sectional view of the superconducting cable shown in Figure 15 with the core part removed. Descriptions that overlap with those referring to FIGS. 3 and 4 will be omitted.

The vacuum partition device 900 shown in FIGS. 15 and 16 divides the vacuum part into a plurality of parts and simultaneously forms a separate vacuum part to prevent heat intrusion into the area where the vacuum partition device is mounted. use.

Since the cover member 940, the insulating member 920, and the metal sheet 910 are arranged in the radial direction in the area where the vacuum section is divided, that is, the center of the vacuum section dividing device 900, the insulating member 920 performs an insulating function. However, heat intrusion may occur due to heat conduction.

Accordingly, in the present invention, the vacuum portion partition device 900 may further include a chamber member 960 for forming its own vacuum portion.

The chamber member 960 may be joined to the outer surface of the external metal tube 600 surrounding the pair of finishing members 950.

Therefore, even if the heat penetrating from the outside of the vacuum partition device 900 is conducted to the inside of the chamber member 960, convection is blocked by the internal vacuum part (V), so the cover member 940 and the insulation member 920 ) and heat intrusion via the metal sheet 910 can be minimized. That is, the heat penetrating from the outside of the vacuum partition device 900 is conducted along the surface of the chamber member 960 to the external metal tube 600 equipped with the vacuum part 500 inside, and only a portion of the heat is conducted. Since it is conducted through the cover member 940, etc., the amount of heat entering the vacuum section 900 that is transmitted to the cooling section can be ignored.

Therefore, in order to sufficiently increase the heat transfer path of heat conducted through the chamber member 960 and the external metal pipe 600 and penetrated into the core portion, the chamber member 960 has a sufficient width and is joined to the external metal pipe 600. It is desirable.

After the chamber member 960 to form its own vacuum part (V) is mounted inside, the vacuum port 980 for suction to form its own vacuum part (V) by evacuating the internal space is provided as described above. It may be provided in the chamber member 960.

In addition, since the external metal pipe 600 is divided by the vacuum section dividing device 900, the vacuum port 680 for vacuuming each vacuum section inside the divided external metal pipes 600a and 600b is divided into each division. It can be provided in the external metal pipes 600a and 600b.

The vacuum section 500 for vacuum insulating one connected cooling section 200 of the superconducting cable installed between the middle or end junction boxes is divided into a plurality of vacuum sections by the vacuum section partition device 900 of this structure. Maintenance of (500) can be facilitated, and heat intrusion through the vacuum partition device (900) can also be minimized to improve the stability of the system.

In this way, the vacuum partition device 900 is mounted between the metal pipes, dividing the external metal pipe and the vacuum part inside it with the vacuum partition device 900 as a boundary, thereby facilitating maintenance of the vacuum part. .

Additionally, a superconducting cable can be completed by sheathing a cable jacket on the outside of the external metal tube. In this case, the cable jacket may be configured to surround the vacuum partition device, or the vacuum partition device area may be configured to expose the vacuum partition device by excluding the covering for maintenance and repair of the vacuum partition device.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. It will be possible to implement it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, it should be considered to be included in the technical scope of the present invention.

1000: Superconducting cable
200: Cooling unit
300: Internal metal pipe
500: Vacuum part
600: External metal pipe
900: Vacuum partition device

Claims (10)

A core portion sequentially provided with a former, a superconducting conductor layer, an insulating layer, and a superconducting shielding layer; In order to cool the core part, it is provided outside the core part to form a cooling part through which cryogenic refrigerant flows, and a plurality of metal tubes are provided on the outside of the inner metal tube of the corrugation structure in which valleys and ridges made of aluminum or stainless steel are repeatedly formed in the longitudinal direction. A partition device installation step of inserting and installing two ring-shaped vacuum partition devices;
A partition device bonding step of arranging and bonding the vacuum partition device installed in the partition device installation step to the outside of the inner metal pipe at predetermined intervals;
An external metal tube forming step of forming a metal plate around the outside of the inner metal tube to which the vacuum partition device is joined in the partition device bonding step to form a corrugation structure in which grooves and ridges are repeated in a spiral shape on the surface;
An external metal tube cutting step of cutting and removing the vacuum partition device area of the external metal tube to expose the vacuum partition device among the external metal tubes formed in the external metal tube forming step; and,
A method of manufacturing a superconducting cable comprising a partition device finishing step of closing both ends of the external metal tube cut in the external metal tube cutting step and the vacuum partition device with a finishing member that partitions the vacuum partition device. According to paragraph 1,
A method of manufacturing a superconducting cable, characterized in that the vacuum partition device installed in the partition device installation step is installed on the outer peripheral surface of the inner metal pipe in an unfixed state. According to paragraph 1,
A method of manufacturing a superconducting cable, characterized in that the partition device bonding step is performed before winding the internal metal tube on a drum. According to paragraph 1,
A method of manufacturing a superconducting cable, characterized in that each vacuum partition device is wrapped with a protective cap after the partition device bonding step. According to paragraph 1,
A method of manufacturing a superconducting cable, characterized in that the outer metal tube forming step is performed after unfolding the inner metal tube wound on a drum in a straight line. According to paragraph 1,
A method of manufacturing a superconducting cable, characterized in that in the partition device finishing step, the vacuum partition device is performed by connecting the outer surface of the inner metal tube and the ends of the divided pair of outer metal tubes. According to clause 6,
A method of manufacturing a superconducting cable, characterized in that in the partition device finishing step, the ends of the pair of external metal tubes are joined to the outer peripheral surface of the vacuum partition device with a finishing member constituting the vacuum partition device. In clause 7,
The partition device finishing step is performed by wrapping and connecting the end of the external metal tube and the outer peripheral surface of the vacuum partition device with a corrugated corrugated finishing member divided at 180 degrees in the circumferential direction. Manufacturing method. A superconducting cable manufactured by the superconducting cable manufacturing method of any one of claims 1 to 8. According to clause 9,
A superconducting cable further comprising a chamber member that surrounds the vacuum section partition device and is respectively joined to the outer surface of the divided external metal tube to form its own vacuum section.