KR20160128655A - Connecting Box of Superconducting Device - Google Patents

Abstract

The present invention relates to a connection box for a superconducting device which can directly measure a temperature of a liquefied coolant, which surrounds a coolant container for vacuum heat insulation of the coolant container accommodating the liquefied coolant during a replacement process of a temperature sensor for monitoring the temperature of the coolant container, and which does not need to release a vacuum state of a vacuum container.

Description

Connecting Box for Superconducting Device {Connecting Box of Superconducting Device}

The present invention relates to a junction box for a superconducting device. More specifically, the present invention can directly measure the temperature of the liquid phase refrigerant, and in the process of replacing the temperature sensor for monitoring the temperature of the liquid phase refrigerant, a vacuum container for wrapping the refrigerant container for vacuum insulation of the refrigerant container, In which the vacuum state of the superconducting device is not required to be released.

The superconducting wire has high electric current transfer capability even at low voltage because the electric resistance converges near zero at a constant temperature. A superconducting device having such a superconducting wire uses a method of cooling by using a coolant such as nitrogen and / or a method of adiabatic formation to form a vacuum layer in order to form and maintain a cryogenic environment. Examples of such superconducting devices may be various devices using the superconducting principle, and particularly superconducting cables as power devices using the superconducting principle.

The current transmitted through the superconducting cable can be supplied through the conductor line of the room temperature environment through the junction box for the superconducting device.

The connection box for a superconducting device is designed to connect a superconducting wire to a conductor wire in a cryogenic environment to prevent a problem that occurs when the environment where the superconducting wire is exposed suddenly changes from a cryogenic environment to a room temperature environment, And extracting the conductor line to the room temperature environment may be used.

6 shows a cross-sectional view of a termination box 2000 as an example of a conventional connection box for a superconducting device.

Therefore, the junction box for a superconducting device can be divided into a room temperature portion A, a temperature regulation portion B and a cryogenic portion C depending on the temperature from the upper end to the lower end, The liquid phase refrigerant is accommodated in the liquid phase refrigerant above the liquid phase refrigerant such that the gaseous refrigerant has a temperature gradient between a cryogenic temperature and a room temperature, and the room temperature part (A) is a room temperature environment.

Therefore, the conductor wire 2210 connected to the superconducting wire 130 is led to the cryogenic part C, the temperature gradient part B and the room temperature part A, and is gradually transferred from the cryogenic environment to the room temperature environment To be exposed. The junction box for superconducting devices minimizes heat loss or heat penetration in an electrically stable state and can connect a superconducting cable as a superconducting device with electric power facilities at room temperature.

The connection box for the superconducting device may include a refrigerant container 2300 and a vacuum container 2400 that insulate the refrigerant container 2300 from the refrigerant container.

The refrigerant in the refrigerant container 2300 is connected to the cooling section defined by the inner metal tube of the superconducting cable and connected to the vacuum container 2400. The vacuum container 2400 includes a vacuum insulated part As shown in FIG. In this case, the cryogenic section C and the temperature regulator section B may be a region surrounded by the vacuum container 2400 constituting the junction box for superconducting machinery.

When the junction box for a superconducting device is an end connection box 2000, the temperature of the liquid coolant or the like may be monitored to verify the stability of the entire superconducting power system.

Therefore, a temperature sensor (T) for indirectly determining the temperature of the liquid coolant can be installed in the junction box for superconducting equipment.

6, the temperature sensor T is provided on the outer wall of the refrigerant container 2300 between the refrigerant container 2300 and the vacuum container 2400 to adjust the temperature of the refrigerant container 2300 The temperature of the liquid coolant accommodated in the coolant vessel 2300 can be measured.

In the conventional method of attaching the temperature sensor T, the temperature of the refrigerant to be actually measured can not be accurately monitored, and there is a possibility that the temperature sensor may be damaged due to an external surge or an abnormal voltage .

 In the case of repairing or replacing the temperature sensor (T) when the temperature sensor (T) fails or its service life is exhausted, it is inevitable to disassemble the vacuum container, which causes a lot of cost and time loss . Especially, the disassembly of the vacuum vessel means the disassembly of the vacuum state, and it is necessary to re-execute the system vacuum evacuation with much time and cost in order to maintain the degree of vacuum necessary for the operation of the system.

6, a plurality of temperature sensors T are provided in the terminal connection box and a plurality of temperature sensors T are uniformly dispersed in the temperature regulator B and the cryogenic section C And to detect the surface temperature of the refrigerant vessel 2300 in the temperature regulator B and the cryogenic section C, respectively. Therefore, even when the temperature sensor T installed in a specific region only has a failure or has a short life, the vacuum state between the refrigerant container 2300 and the vacuum container 2400 can not be released.

The release of the vacuum state for the maintenance and replacement of the temperature sensor T may be achieved not only in the vacuum state inside the vacuum container 2400 of the terminal connection box but also in the vacuum state of the superconducting cable connected to the vacuum container 2400 500, it is impossible to perform the operation in a short period of time in order to form a vacuum state of the connection box and the superconducting cable for restarting the power system after the replacement or repair of the temperature sensor T is completed. Vacuum operation should be performed below the pressure required by the vacuum pump.

However, it is very costly and time-consuming to stop the entire superconducting power system and to perform the vacuuming operation in order to replace one temperature sensor T. Therefore, a new type of temperature sensor mounting structure is required.

The present invention can directly measure the temperature of the liquid coolant, and in the process of replacing the temperature sensor for monitoring the temperature of the liquid coolant, it is possible to reduce the temperature of the coolant in the vacuum state of the vacuum container Disclosed is a junction box for a superconducting device that does not require disconnection.

According to an aspect of the present invention, there is provided a refrigerant container including a cryogenic portion in which a liquid refrigerant is accommodated in a lower portion, a refrigerant container in which a gaseous refrigerant is accommodated in an upper portion of the cryogenic portion, A temperature sensor disposed inside the liquid refrigerant accommodated in the refrigerant container, and a temperature sensor disposed in the liquid refrigerant accommodated in the refrigerant container through the vacuum container and the refrigerant container, And a temperature sensor insertion slot for disposing the superconducting device.

In this case, the temperature sensor may be disposed inside the liquid-phase refrigerant by being mounted on an end of the insertion member extending from the outside of the vacuum container to the inside of the refrigerant container through the temperature sensor insertion slot.

In addition, the temperature sensor insertion slot may be formed to penetrate the vacuum container and the coolant container vertically.

The temperature sensor insertion slot may include an extended vacuum tube extending upwardly from the vacuum container, and an extended refrigerant pipe extending from the refrigerant container may be provided on the inner side.

Here, the upper end of the extended refrigerant tube may be exposed to extend above the upper end of the extended tube, and a feedthrough for electrical connection of the temperature sensor may be mounted on the upper end of the exposed extended refrigerant tube.

In this case, a sealing member may be interposed between the upper end of the extended refrigerant pipe and the feedthrough.

The insertion member may be made of FRP (fiber reinforced plastic).

Further, the pressure in the refrigerant container can be adjusted so that the liquid level of the liquid refrigerant is positioned in the extended refrigerant pipe.

In this case, the connection box for the superconducting device is an end connection box for connecting the superconducting cable and the room temperature conductor drawn out to the room temperature. The termination connection box includes a cable entry area in which the superconducting cable enters in the horizontal direction, Wherein the temperature sensor insertion slot is formed in a vertical direction on the upper surface of the cable lead-in area, and the temperature sensor insertion slot is formed in a direction perpendicular to the upper surface of the cable lead-in area .

Also, a plurality of the temperature sensor insertion slots and the temperature sensors may be provided.

In order to solve the above problems, there is provided a superconducting device comprising a superconducting wire, a coolant container for accommodating liquid coolant for cooling the superconducting wire, a vacuum container surrounding the coolant container, A temperature sensor insertion slot inserted into the refrigerant container from the outside of the vacuum container, an end inserted into the liquid-phase refrigerant inserted into the temperature sensor insertion slot and inserted into the refrigerant container, And a temperature sensor mounted on the end of the insertion member.

In this case, the pressure in the refrigerant container can be adjusted so that the liquid level of the liquid refrigerant is positioned in the temperature sensor insertion slot.

In addition, the temperature sensor insertion slot may include an extended vacuum tube extending upwardly from the vacuum container, an extended refrigerant tube extending from the refrigerant container, and an upper end of the extended refrigerant tube may be connected to the extended vacuum tube And a feedthrough for electrical connection of the temperature sensor may be mounted on the upper end of the exposed extended refrigerant tube.

The connection box for a superconducting device according to the present invention can directly measure the temperature of the liquid refrigerant contained in the connection box for a superconducting device unlike the prior art, so that the temperature inside the system can be accurately monitored.

Further, according to the junction box for a superconducting device according to the present invention, since the temperature inside the superconducting system can be accurately monitored, the stability of the superconducting system can be improved.

Further, according to the junction box for a superconducting device of the present invention, even when the temperature sensor is replaced or repaired in accordance with the failure of the temperature sensor or the end of its life, the vacuum state of the system including the junction box for the superconducting device and the superconducting cable is released You do not have to do.

Further, according to the junction box for a superconducting device of the present invention, when the temperature information sensed by the temperature sensor is transmitted by wire, it is not necessary to use a separate device for transmitting temperature information using the feedthrough, The configuration can be simplified.

1 shows a perspective view of a superconducting cable, which can be connected to a junction box for a superconducting device according to the present invention, in a multi-stage unmolded perspective view.
Fig. 2 shows a cross-sectional view of Fig.
3 shows a perspective view of a junction box for a superconducting device according to the present invention.
Fig. 4 shows a cross-sectional view of the connection box for the superconducting device shown in Fig. 3. Fig.
Fig. 5 shows an enlarged view of the temperature sensor insertion slot region in the sectional view of Fig. 4;
Fig. 6 shows a cross-sectional view of a conventional connection box for a superconducting device.

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 1000 that can be connected to a junction box for a superconducting device according to the present invention, and FIG. 2 is a sectional view of FIG.

A superconducting cable 1000 that can be connected to a connection box for a superconducting device according to the present invention includes a former 110 and a plurality of superconducting wires arranged in parallel to the longitudinal direction of the former 110 to surround the former 110 A plurality of superconducting conductor layers 130 which are disposed in parallel with one another in the longitudinal direction of the former 110 so as to surround the outside of the insulating layer 140; A superconducting cable comprising a core part (100) including at least one superconducting shield layer (180) including a superconducting wire, a core part (100) provided outside the core part (100) A cooling part 200 having a coolant channel for liquid coolant for cooling the part 100, an inner metal pipe 300 provided outside the cooling part 200, and a cooling part 200 provided outside the inner metal pipe 300, (401) is wound in several layers (500) for separating the outer side of the heat insulating part (400) from the vacuum heat insulating part (400), a spiral part (500) spirally spaced in the first direction and surrounding the heat insulating part (400) At least one spacer 560 may be provided on the inner side of the substrate.

The constituent elements of the superconducting cable 1000 will be described below in detail. The former 110 functions as a frame for forming a shape while providing a place for mounting a flat, flat and long superconducting wire around the former 110, and can be a path through which a fault current flows. The former 110 may have a shape obtained by compressing a plurality of copper (Cu) strands 111 having a circular section in a round cylindrical shape or a pipe shape.

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

1 and 2, the former 110 may have a hollow shape, and the former 110 serves as a frame for raising the superconducting wire, and at the same time, And each of the strands 111 constituting the former may be constituted by copper or the like and each of the strands may be connected in parallel with the superconducting wire to cause a failure in the power system It may be configured to serve as a conductor to the ear when a current is generated.

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

The surface of the former 110 is inevitably convex because the strands 111 constituting the former 110 have 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.

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

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

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

The embodiment shown in FIG. 1 shows a total of two superconducting conductor layers 130a and 130b. Further, when the superconducting conductor layers are simply stacked and arranged, the current capacity does not increase according to the skin effect of the current. In order to prevent such a problem, when the superconducting conductor layer is provided in a multi-layer structure, an insulating layer 140 may be provided between the superconducting conductor layers 130a and 130b. The insulating layer 140 may be formed in the form of an insulating tape. The insulating layer 140 may be disposed between the superconducting layers 130a and 130b to isolate the superconducting layers 130a and 130b from each other. . The insulating layers 140 may coincide with the conducting directions of the superconducting conductor layers laminated in a multilayer structure.

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

The superconducting wires constituting each of the superconducting conductor layers 130a and 130b may be connected in parallel with the respective superconducting wires constituting the former 110. [ So that the current flowing through the superconducting wire can flow to the wire of the former 110 in the event of an accident such as destruction of the superconducting condition. When the superconducting condition is not satisfied in this way, the resistance of the superconducting wire is increased and the heat or damage of the superconducting wire is prevented.

As described later, the superconducting wires constituting the superconducting conductor layers 130a and 130b are connected to a conductor line led out to a room temperature in a refrigerant container at a cryogenic temperature portion of a junction box for a superconducting device, The temperature section, and the room temperature section can be sequentially drawn out to the outside. I will postpone the detailed explanation.

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

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

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

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

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

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

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

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

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

The cooling unit 200 may be provided outside the core unit 100. The cooling unit 200 may be provided to cool the superconducting wire of the core unit 100, and the cooling unit 200 may include a circulating flow path for liquid coolant inside the cooling unit 200.

The liquid coolant (liquid nitrogen) circulates in the coolant passage in a cooled state so as to have a temperature of about minus -200 degrees Celsius (° C) The superconducting condition of the superconducting wire included in the core part 100 of the superconducting wire can be maintained.

The cooling channel provided in the cooling unit 200 may allow the liquid phase refrigerant to flow in one direction. The cooling channel is recovered in the connection box for superconducting equipment according to the present invention, re-cooled and then supplied to the cooling channel of the cooling unit 200 . The cooling channel may be partitioned by the inner metal pipe 300.

The inner metal pipe 300 serves as an outer casing of the superconducting cable 1000 for preventing mechanical damage of the core part 100 during installation and operation of the superconducting cable together with the outer metal pipe 600 to be described later, And can function to partition or form the cooling passage.

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 corrugation structure in which the corrugation and the floor are repeated (bulging and depressing repeatedly) in the longitudinal direction of the superconducting cable for reinforcing the rigidity against mechanical stress, 300 may be made of a material such as aluminum or stainless steel.

The bending performance and the rigidity can be improved as compared with the case where the metal pipe is formed in a smooth shape by the corrugation bending structure.

Since the inner metal pipe 300 defines the outside of 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 part 400 may be provided to prevent multi-layer insulation (MLI) from occurring due to radiation such as radiation to the inner metal pipe 300. The heat insulating part 400 may be made of a metal film material having high reflectance.

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

A vacuum 500 may be provided outside the heat insulating part 400. The vacuum chamber 500 may be provided to minimize heat transfer or heat penetration due to convection in the direction of the heat insulating part 400, which may be generated when the heat insulating part 400 does not sufficiently insulate the heat insulating part 400.

The vacuum chamber 500 can be formed by forming a space outside the heat insulating part 400 and vacuuming the space. It is possible to prevent heat invasion by convection by vacuuming.

The vacuum chamber 500 is a space provided to prevent heat from being introduced into the core from the outside at room temperature by convection or the like. The vacuum chamber 500 is partitioned by the outer metal pipe 600.

When the heat insulating portion 400 and the outer metal pipe 600 are in direct contact with each other, the vacuum portion 500 is a space between the outer metal pipes 600 on the inner side of the heat insulating portion 400. However, Heat penetration by conduction may occur.

Therefore, at least one spacer 560 may be provided on the vacuum 500 to prevent the heat insulating part 400 from contacting the external metal pipe 600.

In the embodiment shown in FIGS. 1 and 2, four spacers 560 are shown mounted spirally around the outside of the heat insulating part 400 in the same direction, but the number of the spacers 560 may be increased or decreased have.

 The material of the spacer 560 may be 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 preferably satisfies the following conditions.

That is, fluorinated polyethylene which can be applied to the spacer 560 has a thermal conductivity of not more than 6 (10-4 cal / cm.sec. ° C) 6 according to ASTM C177 in terms of physical properties, and the mechanical properties are based on the ASTM test method a tensile strength of 175 kgf / cm ² or more, the elastic modulus is 3000kgf / cm ² or more, the compressive strength over 100 kgf / cm ^2, it is preferred that the machinability is superior fluorinated polyethylene.

The fluorinated polyethylene which satisfies the above conditions is a type of fluororesin which forms a highly stable compound due to a strong chemical bond between fluorine and carbon, and thus has almost complete chemical inertness, heat resistance, non-tackiness, excellent insulation stability, . Since the fluorinated polyethylene satisfying the above conditions has a certain degree of flexibility, it can spirally wrap the heat insulating part 400, can be disposed in the longitudinal direction of the superconducting cable, and has a certain degree of strength And serves as a separating means for preventing contact between the heat insulating part 400 and the external metal pipe 600 to physically maintain the spacing space constituting the vacuum 500. [

Although the cross-sectional shape of the spacer 560 shown in FIGS. 1 and 2 is shown as a circular shape, various shapes such as a circle, a triangle, a square, and a star shape are possible, and the spacer 560 is made of a material having sufficient strength It is possible to reduce heat penetration by narrowing the heat conduction path or increasing the length of the path by forming the hollow pipe type.

The outer metal pipe 600 may have the same shape and material as the inner metal pipe 300 and the outer metal pipe 600 may have a larger diameter than the inner metal pipe 300, It is possible to form a spacing space. The outer metal pipe 600 may have the same structure and material as the inner metal pipe 300 so as to have excellent bending characteristics and rigidity.

An outer jacket-shaped sheath 700 may be provided outside the outer metal pipe 600 to perform an outer function for protecting the inside of the superconducting cable. The sheath may be made of a sheath constituting a conventional sheath 700 of a power cable. The sheath portion 700 prevents corrosion of the metal pipe 600 and the like inside the sheath portion 700 and prevents damage to the cable due to external force. The sheath portion 700 may be made of a material such as polyethylene (PE) polyvinyl chloride (PVC).

Since the superconducting cable 1000 is provided therein with the vacuum chamber 500 communicating with the vacuum container of the connection box for a superconducting device according to the present invention to evacuate the superconducting cable 1000, In order to replace the temperature sensor attached to the surface of the refrigerant vessel of the case, the vacuum state of the vacuum vessel wrapping the outside of the refrigerant vessel has to be removed inevitably. However, the structure of the temperature sensor mounting structure of the junction box for superconducting equipment Explain.

FIG. 3 is a perspective view of a junction box for a superconducting device according to the present invention, FIG. 4 is a cross-sectional view of the junction box for a superconducting device shown in FIG. 3, And an enlarged view of the area.

As described above, the superconducting device connected to the connection box for a superconducting device shown in FIG. 3 may be a superconducting cable, and the connection box is exemplified by a terminal connection box connecting the superconducting wire of the superconducting cable and the room temperature conductor wire. Is not limited to the termination junction box and may be an intermediate connection box for interconnecting the superconducting cable in the long term installation period. The intermediate connection case is also provided with a vacuum container which is connected to the outside of the superconducting cable in a state of being communicated with the vacuum chamber 500 of the superconducting cable to provide vacuum insulation and to connect the cooler 200 of the superconducting cable, And it is necessary to monitor the temperature of the refrigerant flowing in the refrigerant container even in the intermediate connection box.

One embodiment of a junction box for a superconducting device according to the present invention comprises a cryogenic part C in which a liquid coolant is received in a lower part, a temperature cure in which a gaseous coolant is accommodated in an upper part of the cryogenic part C, A vacuum container 2400 surrounding the refrigerant container 2300 to vacuum insulate the refrigerant container 2300, a vacuum container 2400 and the refrigerant container 2300 enclosing the refrigerant container 2300, A temperature sensor insertion slot 3000 for mounting a temperature sensor T to be mounted through the temperature sensor insertion slot 3000 and an end portion extending to the inside of the liquid coolant accommodated in the coolant container 2300 through the temperature sensor insertion slot 3000 May include a temperature sensor (T) mounted at the end of the insertion member (3200).

In addition, even when the junction box for a superconducting device according to the present invention is an intermediate junction box, a refrigerant container 2300 in which liquid refrigerant for cooling the superconducting wire of the superconducting device is accommodated, a vacuum container 2400 surrounding the refrigerant container, A temperature sensor insertion slot 3000 installed to pass through the inside of the refrigerant container from the outside of the vacuum container to dispose the temperature sensor in the liquid refrigerant contained in the refrigerant container 2300,

An insertion member 3200 inserted into the temperature sensor insertion slot and disposed in the liquid coolant accommodated in the refrigerant container and having a temperature sensor mounted on the end thereof, and a temperature sensor (not shown) mounted on the end of the insertion member 3200 T). ≪ / RTI >

The connection box 2000 for a superconducting device according to the present invention shown in FIGS. 3 to 5 has a structure in which a superconducting cable 1000 is drawn in the right direction and a superconducting wire constituting the superconducting cable 1000 in an upward direction, The room temperature conductor 2210 connected in the liquid phase refrigerant of the superconducting device 2000 sequentially flows through the cryogenic part C, the temperature gradient part B and the room temperature part A of the superconducting device connection case 2000, Out structure.

Accordingly, the junction box 2000 for a superconducting device according to the present invention includes a cryogenic part C in which the liquid phase refrigerant l is received, a gas phase refrigerant g communicated with the cryogenic part C, Temperature conductor wire 2210 is extended upward and is separated from the temperature regulator B and the temperature regulator B and is extended in the cryogenic temperature portion C and the temperature regulator portion B, And a room temperature portion A where the normal temperature conductor wire 2210 is extended and drawn out.

More specifically, the connection box 2000 for a superconducting device includes a super-low temperature portion C that is connected in a state where the superconducting wire 130 and the conductor wire 2210, which constitute the superconducting cable 1000, , A temperature regulator (B) in which the conductor line (2210) is extended and a gaseous refrigerant is housed so as to have a constant temperature gradient as the height of the liquid refrigerant received in the cryogenic part (C) (A) partitioned by the bulb portion (B), in which insulating oil or insulating gas is accommodated in a room temperature environment, and a conductor wire provided with a bushing on the outside is extended and drawn out.

Since the cryogenic section C in which the cryogenic liquid refrigerant is accommodated and the temperature regulator section B in which the gaseous refrigerant is accommodated are mutually communicated, the liquid level ls of the liquid refrigerant contained in the cryogenic section C is in the liquid phase The boundary between the cryogenic temperature part C and the temperature regulating part B can be changed because the temperature can be raised or lowered according to the temperature of the refrigerant and the internal pressure.

Therefore, the cryogenic temperature part C and the temperature regulating part B are understood to be the area in which the coolant vessel 2300 in which the liquid coolant is received is divided according to the position of the liquid level ls.

The conductor line 2210 is connected to the superconducting cable layer 130 side of the superconducting cable 1000. The connection of the conductor line 2210 to the superconducting conductor layer 130 means that the conductor line 2210 is directly connected to the superconducting conductor layer 130 through connection means such as a joint, The connection conductor 2120 and the connection conductor 2120 described below, and the like.

4, a connection conductor 2120 connected to the superconducting conductor layer 130 of the superconducting cable 1000 in the cryogenic part C is connected at the connection part 2110, The connection conductor 2120 connected to the conductor line 2210 may be electrically connected to the conductor line 2210 through a joint 2130 with the conductor line 2210. [ Although not shown in FIG. 4, an insulating support may be provided in the vicinity of the connecting portion 2110 to relieve stress that may be generated by heat shrinkage.

The joint 2130 can provide a structure that can be stably connected to the conductor line 2210 or the like in spite of horizontal shrinkage or tensile depending on the temperature of the connection conductor 2120. For example, the joint 2130 may include a flexible wire connecting member or the like.

The conductor line 2210 connected to the joint 2130 extends in the upper direction of the refrigerant vessel 2300. The conductor line 2210 may be made of copper (Cu) or aluminum (Al), and the bushing 2220 may be provided on the outside. Of course, the conductor line 2210 may be provided in the form of a conductor in which the bushing 2220 is omitted. Copper (Cu) or aluminum (Al) is an example of a conductive material such as a metal having a small electrical resistance even in the vicinity of a temperature of a refrigerant in which a superconducting cable is used, for example, when liquid nitrogen is used as a refrigerant.

The bushing 2220 may be in the form of a stainless steel pipe and the outer side thereof coated with an insulating material such as ethylene propylene rubber or reinforced plastic (FRP). The bushing may be provided with a foil electrode 2221 in a direction perpendicular to an inclined plane at an upper end portion and a lower end portion 2222 in the longitudinal direction of the outer periphery and a portion provided with the thin electrode 2221 may have a tapered shape . The thin electrode 2221 provided in the bushing 2220 may be employed as an electric field relaxation means.

The liquid refrigerant l in the cryogenic section C and the gaseous refrigerant g in the temperature gradient section B may be stored in the refrigerant vessel 2300 that receives the refrigerant. The refrigerant vessel may be made of a metal such as stainless steel having excellent strength.

Therefore, the refrigerant container 2300 includes a cryogenic part C in which a liquid refrigerant is received in a lower portion thereof, a refrigerant container 2300 in which a gaseous refrigerant g is accommodated in an upper portion of the cryogenic part C, It can be understood that it includes the balloon portion B as shown in Fig.

The refrigerant container 2300 may have a structure in which the liquid refrigerant 1 is accommodated in a lower portion thereof, the gaseous refrigerant g is accommodated in an upper portion thereof, and the lower portion of the conductor line 2210 is immersed. The liquid level ls of the liquid coolant 1 accommodated in the lower portion of the coolant vessel 2300 can be raised or lowered according to the temperature or pressure therein. The gaseous refrigerant (g) may be gaseous nitrogen when the liquid refrigerant is liquid nitrogen.

The refrigerant container 2300 is connected to the cooling unit 200 of the superconducting cable 1000 so that the liquid refrigerant in the refrigerant container 2300 can circulate to the cooling unit 200.

The junction box 2000 for a superconducting device according to the present invention may have a sealing member 2600 for sealing the temperature regulating portion B in a state partitioned from the room temperature portion A. [

The upper end of the refrigerant container 2300 may have an open structure and the sealing member 2600 for sealing the refrigerant container 2300 may be made of epoxy or the like as a plastic rich in weatherability and corrosion resistance. have.

The room temperature portion A may be provided on the temperature regulating portion B with the sealing member 2600 as a boundary.

The room temperature part A may include the conductor line 2210 extending inside and may include a room temperature part 2210 surrounding the conductor line 2210 and containing an insulating oil or insulation gas such as air or SF6 gas, A tubular body 2700 may be provided. The room temperature tube 2700 may have a self-organizing configuration.

The conductor line 2210 passing through the room temperature portion A can be drawn out to the outside while minimizing impact due to temperature change.

In addition, a vacuum container 2400 enclosing the refrigerant container 2300 for vacuum insulation may be provided. The vacuum container 2400 may be configured to communicate with the vacuum 500 of the superconducting cable and may be configured to enclose the refrigerant container. 4, the vacuum container may extend to an upper portion of the refrigerant container 2300 to enable vacuum insulation of the refrigerant.

Meanwhile, the connection box 2000 for a superconducting device may include a temperature sensor as a sensing unit for directly measuring the temperature of the liquid refrigerant contained in the refrigerant container 2300.

Conventional terminal connection boxes for superconducting devices can not directly measure the temperature of the liquid refrigerant, but use a method of indirectly grasping the temperature of the refrigerant by mounting a temperature sensor on the surface of the refrigerant container 2300. However, as described above, when a failure occurs in the temperature sensor or when the life of the temperature sensor is terminated, it is inevitably required to release the vacuum state when the temperature sensor is replaced.

However, the temperature sensor T mounted in the terminal box 2000 for superconducting equipment according to the present invention shown in FIGS. 3 to 5 can be mounted so as to directly measure the temperature of the liquid coolant.

Specifically, the junction box 2000 for a superconducting device according to the present invention may include a temperature sensor T disposed inside the liquid coolant contained in the coolant vessel 2300.

Since the temperature of the liquid coolant can be measured directly by mounting the temperature sensor T in the liquid coolant, much more accurate temperature information can be obtained than in the conventional method of measuring the temperature of the coolant container.

In order to dispose the temperature sensor (T) in the liquid refrigerant, the connection box for a superconducting device according to the present invention includes a vacuum container (2400) and a refrigerant container (2300) A temperature sensor insertion slot 3000 for disposing the temperature sensor T may be provided.

4, the temperature sensor T includes an insertion member 3200 (see FIG. 4) that extends from the outside of the vacuum container 2400 through the temperature sensor insertion slot 3000 and extends to the inside of the refrigerant container 2300, And may be disposed inside the liquid-phase refrigerant.

The temperature sensor insertion slot 3000 may be formed to pass through the vacuum container 2400 and the coolant container 2300 in a vertical direction.

Since the temperature sensor insertion slot 3000 extends directly to the refrigerant container 2300, the risk that the liquid refrigerant flows out through the temperature sensor insertion slot 3000 due to factors other than the internal pressure, for example, It is preferable that the temperature sensor insertion slot 3000 is mounted on the superconducting device connection box 2000 so as to pass through the vacuum container 2400 and the coolant container 2300 in the vertical direction.

As shown in FIG. 5, the specific structure of the temperature sensor insertion slot 3000 is such that an extended vacuum tube 3400 in which the vacuum vessel 2400 extends upwardly is provided on the outer side, and the refrigerant vessel 2300 The extension refrigerant pipe 3300 may be provided.

Therefore, it can be understood that the extended refrigerant pipe 3300 forms a cryogenic part in which the liquid refrigerant is received, and a temperature gradient part in which a gaseous refrigerant is received and forms a gradual temperature gradient is formed on the liquid level.

Therefore, it is preferable that the pressure in the refrigerant container 2300 is adjusted so that the liquid level of the liquid refrigerant is positioned in the extended refrigerant pipe 3300. When the pressure in the refrigerant container 2300 is adjusted so that the liquid level of the liquid refrigerant is positioned in the extended refrigerant pipe 3300, the temperature sensor T is positioned inside the liquid refrigerant accommodated in or flowing into the refrigerant container 2300 Because it can guarantee that.

When the gas refrigerant is received in the temperature sensor insertion slot 3000 to form a temperature gradient portion, heat penetration from the outside through the temperature sensor insertion slot 3000 can be minimized.

5, the upper end of the extended refrigerant pipe 3300 is exposed to the upper side of the upper end of the extended refrigerant pipe 3400, and the upper end of the extended refrigerant pipe 3300 is exposed, A feedthrough 3500 may be mounted as a conductive member for electrical connection of the antenna T. [

The terminals of the feedthrough 3500 are provided on both sides and the terminals led to the inside of the extended refrigerant tube 3300 are electrically connected to the temperature sensor T by a cable (not shown) 3500 may be electrically connected to the control means of the superconducting power system to transmit sensed temperature information.

A cable (not shown) connecting the temperature sensor T and the feedthrough 3500 may be disposed together with the insertion member 3200.

In addition, the extension refrigerant pipe 3300 is mounted such that the insertion member 3200 penetrates and the temperature sensor T is disposed inside the liquid refrigerant at the end thereof.

Therefore, a sealing member 3600 is interposed between the extended refrigerant pipe and the feedthrough 3500 to prevent heat intrusion or refrigerant leakage through the penetration area of the insertion member 3200, thereby enhancing sealing performance .

The connection for the superconducting device according to the present invention has an advantage that the temperature of the liquid phase refrigerant can be directly measured by having the temperature sensor insertion slot 3000. However, when the liquid phase refrigerant is directly contacted with the liquid phase refrigerant using the insertion member 3200 or the like The insertion member 3200 is made of a material such as fiber reinforced plastic (FRP) which is not easy to conduct heat, so that heat penetration by heat conduction can be prevented. Can be minimized.

The reinforced plastic (FRP) has a low thermal conductivity, a low shrinkage ratio at which the shape is not deformed at an extremely low temperature, and a mechanical strength. Therefore, the temperature sensor T can be stably mounted and disposed inside the refrigerant container, and heat penetration through the insertion member 3200 equipped with the temperature sensor T can be minimized.

The connection box for a superconducting device according to the present invention may be an end connection box for connection of a superconducting cable. In the end connection port of the superconducting cable, as described above with reference to FIG. 4, the superconducting cable is connected to the room- After which the normal temperature conductor line can be configured to minimize thermal shock and pull out.

4, the cable connection area I in which the superconducting cables are horizontally drawn and the normal-temperature conductor wires connected to the superconducting wires of the drawn-in superconducting cable 1000 are sequentially connected to the cryogenic parts C and C, The temperature sensor insertion slot 3000 may be formed in a vertical direction on the upper surface of the cable inlet region I, and the temperature sensor insertion slot 3000 may be formed in a direction perpendicular to the upper surface of the cable inlet region I have.

As described above, the temperature sensor insertion slot 3000 is desirably installed vertically, and the position where the temperature sensor insertion slot 3000 is vertically installed is the same as the position of the cable entry area 3000 I).

Since the superconducting cable is generally installed in the horizontal direction, the cable entry area I is also configured in a horizontal direction, so that it is easy to secure a place for mounting the temperature sensor insertion slot 3000.

Accordingly, when the temperature sensor T mounted through the temperature sensor insertion slot 3000 has a failure or the life of the temperature sensor is shortened, It is not necessary to release the vacuum state between the refrigerant container and the vacuum container for maintenance and replacement, and in the case of separating the temperature sensor for maintenance of the temperature sensor (T), the termination structure and the superconducting cable It is possible to replace the temperature sensor without releasing the vacuum state of the entire system including it.

In the embodiment shown in FIGS. 3 to 5, one temperature sensor insertion slot 3000 is provided. However, a plurality of temperature sensor insertion slots 3000 may be provided, The temperature of the liquid refrigerant can be monitored during the replacement process, and the temperature distribution can also be grasped by region.

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

1000: Superconducting cable
100: core part
130: superconducting layer
200:
500: the jeans study
2000: Connection box for superconducting equipment
2300: Refrigerant container
2400: Vacuum container
A: room temperature part
B:
C: Cryogenic part

Claims (13)

A refrigerant container having a cryogenic temperature portion in which a liquid refrigerant is accommodated in a lower portion, and a temperature gradient portion in which a gaseous refrigerant is contained in an upper portion of the cryogenic portion and a temperature gradient of the gaseous refrigerant is present;
A vacuum container enclosing the refrigerant container for vacuum insulation of the refrigerant container;
A temperature sensor disposed in the liquid coolant contained in the coolant vessel; And
And a temperature sensor insertion slot for inserting the temperature sensor through the vacuum container and the coolant container and inside the liquid coolant accommodated in the coolant container. The method according to claim 1,
Wherein the temperature sensor is disposed inside the liquid-phase refrigerant by being mounted to an end of the insertion member, the end of which penetrates through the temperature sensor insertion slot from the outside of the vacuum container and extends into the inside of the refrigerant container. The method according to claim 1,
And the temperature sensor insertion slot is formed to vertically penetrate the vacuum container and the refrigerant container. The method of claim 3,
Wherein the temperature sensor insertion slot is provided with an extended vacuum tube extending upwardly from the vacuum container on an outer side thereof and an extended refrigerant pipe extending from the refrigerant container on the inner side thereof. 5. The method of claim 4,
Wherein an upper end of the extended refrigerant tube is exposed to extend above an upper end of the extended tube and a feedthrough for electrically connecting the temperature sensor is mounted on the upper end of the exposed extended refrigerant tube. . 6. The method of claim 5,
Wherein a sealing member is interposed between the upper end of the extended refrigerant pipe and the feedthrough. The method according to claim 1,
Wherein the insertion member is made of FRP (fiber reinforced plastic). The method according to claim 1,
And the pressure in the refrigerant container is adjusted so that the liquid level of the liquid refrigerant is positioned in the extended refrigerant pipe. The method according to claim 1,
Wherein the connection box for the superconducting device is an end connection box for connecting the superconducting cable and the room temperature conductor which is drawn out to the room temperature, and the termination connection box includes a cable entry area in which the superconducting cable is horizontally drawn and a superconducting wire of the superconducting cable And the temperature sensor insertion slot is formed in a direction perpendicular to the upper surface of the cable lead-in area. The temperature sensor insertion slot is formed in a vertical direction on the upper surface of the cable lead-in area Of the superconducting device. The method according to claim 1,
Wherein the plurality of temperature sensor insertion slots and the temperature sensors are provided. A refrigerant vessel in which liquid refrigerant for cooling the superconducting wire of the superconducting device is accommodated;
A vacuum container enclosing the refrigerant container;
A temperature sensor insertion slot formed to penetrate from the outside of the vacuum container to the inside of the refrigerant container in order to dispose the temperature sensor in the liquid refrigerant contained in the refrigerant container;
An insertion member inserted into the temperature sensor insertion slot and having an end disposed in the liquid coolant accommodated in the coolant container and a temperature sensor mounted on the end; And
And the temperature sensor mounted on the end of the insertion member. 12. The method of claim 11,
And the pressure in the refrigerant container is adjusted so that the liquid level of the liquid refrigerant is positioned in the temperature sensor insertion slot. 12. The method of claim 11,
Wherein the temperature sensor insertion slot is provided with an extended vacuum tube extending upwardly from the vacuum container, an extended refrigerant tube extending from the refrigerant container is provided inside the temperature sensor insertion slot, and an upper end of the extended refrigerant tube is connected to the upper end of the extended tube And a feed-through for electrical connection of the temperature sensor is mounted on the upper end of the exposed extended refrigerant tube.

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