WO2014057566A1 - Procédé d'évaluation d'un cœur de câble pour un câble supraconducteur - Google Patents

Procédé d'évaluation d'un cœur de câble pour un câble supraconducteur Download PDF

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Publication number
WO2014057566A1
WO2014057566A1 PCT/JP2012/076367 JP2012076367W WO2014057566A1 WO 2014057566 A1 WO2014057566 A1 WO 2014057566A1 JP 2012076367 W JP2012076367 W JP 2012076367W WO 2014057566 A1 WO2014057566 A1 WO 2014057566A1
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Prior art keywords
cable core
drum
core
cable
superconducting
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PCT/JP2012/076367
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English (en)
Japanese (ja)
Inventor
忠 瀬戸口
正義 大屋
和晃 畳谷
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住友電気工業株式会社
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Priority to PCT/JP2012/076367 priority Critical patent/WO2014057566A1/fr
Publication of WO2014057566A1 publication Critical patent/WO2014057566A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/1238—Measuring superconductive properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Definitions

  • the present invention relates to a test method for a cable core that is a main component of a superconducting cable.
  • the present invention relates to a method for testing a cable core for a superconducting cable that can prevent the cable core from being damaged by heat shrinkage during the test.
  • a superconducting cable is being developed as a power cable constituting the power supply path.
  • a superconducting cable typically includes a cable core having a superconducting conductor layer, and a heat insulating tube that houses the cable core and is filled with a refrigerant such as liquid nitrogen.
  • a full length test (frame test) is performed on the full length before shipping to the factory to investigate the electrical characteristics.
  • frame test when examining the electrical characteristics of a superconducting cable, it is necessary to cool the superconducting conductor layer to bring it into a superconducting state. Therefore, if a full-length test of a superconducting cable is performed, it takes time because a thin heat insulating tube must be filled with a refrigerant. Further, when the superconducting cable is cooled while being wound around the drum, the bending diameter of the superconducting cable is regulated by the diameter of the drum drum.
  • Patent Document 1 proposes that a full length test of a superconducting cable is performed at room temperature by filling a gas in a heat insulating tube.
  • the cable core wound around the drum may be housed in a container, and the container may be filled with a refrigerant.
  • a simple cooling facility is used. The test can be conducted.
  • the cable core is cooled in a state of being wound around the drum, the cable core is thermally contracted so that the winding diameter thereof is reduced, that is, the drum drum is tightened. Due to this contraction, at least a part of the cable core is strongly pressed against the winding drum, and there is a risk of damaging components such as the superconducting conductor layer.
  • one of the objects of the present invention is to provide a method for testing a cable core for a superconducting cable that can suppress damage to the cable core during the test.
  • the present invention achieves the above object by cooling the cable core in a specific state.
  • the test method of the cable core for a superconducting cable relates to a test method for examining the characteristics of the cable core, which is a main component of the superconducting cable, over its entire length, and the following preparation process, storage process, And an inspection process.
  • Preparatory process A process of preparing a cable core having a superconducting conductor layer and wound around a drum as a test target.
  • Storage process The process which stores the said test object in a cooling container.
  • Inspection process The process of examining the characteristic of the full length of the said cable core, cooling the said superconducting conductor layer with the refrigerant
  • the cable core is formed in a state in which an allowance for heat shrinkage of a winding diameter accompanying cooling of the cable core is formed inside a turn formed by the cable core. Cooling.
  • the method for testing a cable core for a superconducting cable according to the present invention can perform a full length test on a sound cable core while suppressing damage to the cable core. For example, when a clearance is provided between the inner peripheral surface of the cable core and the drum drum, this clearance can be used, and the drum drum itself is deformed following the variation of the winding diameter. When such a mechanism is provided, this deformation can be used.
  • An embodiment of the present invention includes a mode in which, when the cooling container is filled with the refrigerant, the refrigerant is introduced so as to cool the cable core after cooling the drum drum.
  • the diameter of the drum becomes smaller than that before cooling, and the inner circumference of the turn formed by the cable core not thermally contracted.
  • a gap can be provided between the surface and the winding drum by the amount of thermal contraction of the winding drum.
  • the temperature of the cable core is measured and the supply state of the refrigerant is adjusted so that the cooling rate of the cable core is within a predetermined range.
  • the cooling rate of the cable core can be adjusted, for example, it can be slowed. Therefore, in the above-described embodiment, for example, after the winding drum is sufficiently heat-shrinked to provide a gap between the cable core and the winding drum, the cable core is heat-shrinked so that the cable core is more reliably damaged. Can be prevented.
  • coolant is introduce
  • the form which cools the said cable core is mentioned.
  • the winding drum is cooled and thermally contracted before the cable core, and a gap is provided between the cable core and the winding drum. Therefore, the said form can prevent damage to a cable core more reliably.
  • the method further comprises a temperature raising step for raising the temperature of the test object to a predetermined temperature.
  • a temperature raising step for raising the temperature of the test object to a predetermined temperature.
  • the temperature of the cable core is raised to a predetermined temperature, The form which heats up is mentioned.
  • the cable core is first thermally expanded. Therefore, the said form is a state in which the winding drum was reduced in diameter when the cable core was thermally expanded, and the winding diameter of the cable core was sufficiently large when the winding drum was thermally expanded. Therefore, since the thermally expanded cable core and the reduced diameter winding drum are not substantially in contact with each other, the cable core is not substantially damaged when the cable core is thermally expanded.
  • a gap is provided between the winding drum and the cable core whose winding diameter is increased by the thermal expansion.
  • This gap can be used as an absorption allowance for thermal expansion of the winding drum. Therefore, the said form can also prevent that a cable core is damaged by the expanded winding drum.
  • the cable core includes a former that supports the superconducting conductor layer, and the former is made of a normal conducting material, the cable core is raised.
  • the temperature can be controlled by energizing the former.
  • the cable core typically includes a former in order to support the wire.
  • the former is typically made of a normal conductive material such as copper.
  • the former expands due to Joule heat when energized.
  • the amount of thermal contraction / expansion of the cable core including the former substantially depends on the amount of thermal contraction / expansion of the former. Therefore, the form can raise the former sufficiently and easily, and the winding diameter of the cable core can be easily increased by thermally expanding the former by this temperature rise.
  • the temperature rise of the cable core can be performed by a heater provided on the outer periphery of the cable core.
  • a member independent of the cable core such as a heater, makes it easy to connect the wiring for energization. Therefore, the said form can contribute to the facilitation of construction of the full length test system.
  • heaters with various specifications energization capacity, heat generation capacity, size, shape, material, etc.
  • the heating time of the cable core can be shortened by adjusting the heater energization conditions. Therefore, the said form can also contribute to shortening of the measurement time of a full length test.
  • the drum has a winding drum that winds up the cable core of the superconducting cable, and a flange provided at at least one end of the winding drum, and the winding drum has an outer periphery thereof.
  • the drum drum has a relaxation structure, and by changing the outer peripheral contour diameter of the drum, for example, a gap is provided between the cable core and the drum.
  • a gap is provided between the cable core and the drum.
  • the outer peripheral contour diameter of the winding drum changes following the reduction of the winding diameter of the cable core, this change can be used as the above-described clearance. Therefore, also in the above-described form, the stress due to the thermal contraction when the cable core is cooled can be relieved by the clearance allowance, and the cable core can be prevented from being damaged during the test.
  • the drum having the relaxation structure there is a form in which the winding drum is constituted by a plurality of long materials that are detachably attached to the flange portion.
  • the relaxation structure is configured by changing the long material to a different position with respect to the collar, and the cable core before cooling is wound as an attachment position of the long material to the collar.
  • the long core is attached to the large diameter position of the collar, the cable core is wound around the winding drum, and the long core is replaced with the small diameter position of the collar before cooling.
  • a gap is provided between the scale member. If the cable core is cooled after the replacement, the outer diameter of the winding drum corresponds to the wound diameter after cooling even if the cable core is thermally contracted. It can suppress acting. That is, in the said form, the difference of the above-mentioned replacement position is utilized for the above-mentioned escape allowance.
  • the winding drum may be composed of a plurality of long members that are slidable in the radial direction with respect to the flange portion.
  • the said relaxation structure is comprised by sliding the said elongate material to the position where the radial direction of the said collar part differs, and has the slide length corresponding to the winding diameter difference of the said cable core before and behind cooling.
  • the above-described form is obtained by sliding the long material in the radial direction of the collar portion in advance, thereby forming the cable core and the winding drum made of the long material. A gap is provided between the two. Therefore, this form can also suppress that an excessive stress acts on the core by the gap.
  • the above-described form is particularly a configuration in which the long material slides (automatically) in the radial direction of the collar portion following the thermal contraction of the cable core (for example, a configuration including the following elastic member). For example, even if the clearance is not provided, it is possible to suppress an excessive stress from acting on the core by using the sliding allowance for the above-described clearance.
  • the relaxation structure corresponds to the winding diameter of the cable core after cooling when the cooled cable core is returned to room temperature.
  • the elastic member which energizes the said elongate material from the position to the position corresponding to the winding diameter of the said cable core before cooling is mentioned.
  • the long material when the cable core is cooled, the long material can be slid toward the center side of the collar portion against the urging force of the elastic member as the winding diameter of the core decreases.
  • the long material when the cooled cable core is returned to room temperature, the long material is slid to the outer peripheral side of the collar portion by the urging force of the elastic member as the winding diameter of the cable core increases. Can do.
  • the diameter of the winding drum can be made to correspond to the winding diameter of the cable core even at the time of returning to normal temperature, and it is possible to prevent a large gap from being generated between the cable core and the winding drum after returning to normal temperature.
  • the relaxation structure may include a relaxation layer made of a material that can be deformed so as to absorb a reduction in the winding diameter of the cable core.
  • the winding drum includes the relaxation layer, so that the relaxation layer can be deformed corresponding to the reduction of the winding diameter accompanying the thermal contraction of the cable core.
  • the drum having a collar provided at at least one end of the winding drum, it is detachable from the collar on the outer peripheral side of the collar than the cable core wound around the winding drum. And providing a shape holding member that prevents the cable core from being collapsed.
  • the shape holding member is provided on the outer peripheral side of the collar portion with respect to the cable core, so that the cable core can be prevented from being collapsed in the process of cooling and raising the temperature of the cable core wound around the drum.
  • the drum drum for example, a drum made of a specific material can be used. Therefore, as one aspect of the present invention, the drum drum is made of a material having a thermal contraction rate larger than that of the main member that shares the tension acting on the cable core among the constituent members of the cable core. The form currently made is mentioned.
  • the cable core heat-shrinks when cooled during the test, but the heat shrinkage rate of the winding drum is the main member that shares the tension in the core ( The diameter of the winding drum is sufficiently smaller than that before cooling. Therefore, when the cable core is thermally contracted, a gap is provided between the inner peripheral surface of the turn created by the core and the winding drum, and this gap can be used as the above-described clearance. Due to the interposition of the gap, the cable core is hardly pressed against the winding drum or is not substantially pressed. Therefore, the said form can prevent that a cable core is damaged by the thermal contraction by cooling at the time of a test, and can perform the full length test of the cable core of a healthy state.
  • the main member that shares the tension is made of a normal conducting material and is a former that supports the superconducting conductor layer.
  • the superconducting conductor layer included in the superconducting cable is formed by winding a wire including an oxide superconducting phase, as described above, typically, a former composed of a normal conducting material such as copper is provided.
  • a former composed of a normal conducting material such as copper is provided.
  • the amount of heat shrinkage of the cable core substantially depends on the amount of heat shrinkage of the former as described above. Therefore, in the above configuration in which the drum drum is made of a material having a thermal contraction rate larger than that of the former, the drum is sufficiently shrunk so that a gap is provided between the cable core and the drum. Damage to the cable core can be suppressed by the gap.
  • the main member that shares the tension is made of copper or a copper alloy, and the winding drum is selected from aluminum, aluminum alloy, magnesium, and magnesium alloy.
  • the form comprised from 1 type which is made is mentioned.
  • Aluminum (linear expansion coefficient: 0.237 ⁇ 10 ⁇ 4 / K), magnesium (linear expansion coefficient: 0.271 ⁇ 10 ⁇ 4 / K), and its alloys include copper (linear expansion coefficient: 0.162 ⁇ 10 ⁇ 4 / K) and its It can be said that the linear expansion coefficient is sufficiently larger than that of the alloy, and the heat shrinkage ratio is sufficiently large. Therefore, in the above-described embodiment, the drum drum sufficiently contracts during cooling, and a gap is provided between the cable core and the drum, and damage to the cable core can be suppressed by this gap.
  • the storing step includes a mode in which the test object is stored in the cooling container so that the axis of the drum is parallel to the axis in the depth direction of the cooling container.
  • this storage form may be referred to as “vertical storage”)
  • the size of the bottom surface of the cooling container can be made to correspond to the diameter of the flange portion of the drum. Therefore, compared to the case where the test object is stored in the cooling container so that the axis of the drum is orthogonal to the axis of the cooling container in the depth direction (hereinafter, this storage form may be referred to as “horizontal storage”),
  • the said form can reduce the size of a cooling container.
  • the said form can reduce the nonuniformity of the tension
  • the drum includes a winding drum around which the cable core is wound, and flanges provided at both ends of the winding drum, and at least one of the flanges with respect to the winding drum.
  • the test object is stored in the cooling container with the one flange part removed.
  • the cooling container includes a lid portion
  • the storing step includes storing the test object attached to the lid portion in the cooling container.
  • the above-described configuration in which the cooling vessel is provided with the lid portion easily insulates the refrigerant and the test object during the test from the external space of the cooling vessel.
  • the test object by attaching the test object to the lid part, it is possible to simultaneously store the test object in the cooling container and seal the cooling container with the lid part. Excellent.
  • This form is particularly suitable for the above-described vertical storage.
  • the test object is suspended from the lid, and when the test object is housed in the cooling container, the drum becomes the cooling container. It is mentioned that it is non-contact with the bottom face.
  • the above-described form in which the test object is suspended from the lid can easily hold the drum in non-contact with the bottom surface of the cooling container. Accordingly, by enclosing the entire circumference of the drum with a refrigerant and making it non-contact with the cooling container, the above configuration can uniformly cool the drum and the cable core wound around the drum.
  • the test method of the cable core for a superconducting cable according to the present invention can prevent the cable core from being damaged during the test and can accurately check the electrical characteristics of the entire length of the cable core.
  • FIG. 3 is an explanatory diagram for explaining a test method for a cable core for a superconducting cable according to the first embodiment.
  • FIG. 3 is an explanatory diagram for explaining a procedure for housing a cable core in a cooling container in the first embodiment.
  • FIG. 2 is a schematic configuration diagram showing an example of a drum that winds up a cable core and having a refrigerant flow passage in the first embodiment.
  • FIG. 5 is an explanatory view showing a usage state of a drum used in a test method for a cable core for a superconducting cable according to a second embodiment.
  • FIG. 9 is an explanatory diagram showing a procedure for housing a cable core in a cooling container in the second embodiment.
  • FIG. 5 is an explanatory diagram for explaining a test method for a cable core for a superconducting cable according to a second embodiment.
  • A is a plan view of a drum having a relaxation structure
  • B is a BB cross-sectional view of (A)
  • C is a CC cross-sectional view of (A).
  • FIG. 6 is an explanatory diagram for explaining a test method for a cable core for a superconducting cable according to a third embodiment.
  • FIG. 9 is an explanatory diagram for explaining a procedure for housing a cable core in a cooling container in the third embodiment. It is a cross-sectional view which shows the cable core for superconducting cables typically.
  • the first embodiment is a mode in which cooling is performed in a specific order when performing a full length test of a cable core for a superconducting cable.
  • a cable core for a superconducting cable to be tested a drum for winding the cable core, a cooling container for storing the test object, and a control device for controlling the cooling / heating state of the cable core will be described.
  • a cable core test method will be described.
  • the cable core will be described with reference to FIG.
  • the cable core 100 includes, for example, a former 101, a superconducting conductor layer 102, an electrical insulating layer 103, an outer superconducting layer 104, and a protective layer 105 in order from the center.
  • the former 101 is a support member for the superconducting conductor layer 102, and also functions as a tensile material for the cable core 100.
  • the former 101 is used for an energization path that diverts an accident current in the event of an accident such as a short circuit or a ground fault.
  • the former 101 can be preferably a solid body or hollow body (tubular body) made of a normal conducting material such as copper, aluminum, or an alloy thereof. More specifically, for example, a stranded wire material obtained by twisting a plurality of copper wires having an insulation coating such as polyvinyl formal (PVF) or enamel.
  • a cushion layer can be provided by winding an insulating tape material such as kraft paper or PPLP (registered trademark of Sumitomo Electric Industries, Ltd.) around the outer periphery of the former 101.
  • Examples of the superconducting conductor layer 102 and the outer superconducting layer 104 include a single layer or a multilayer including a wire layer in which a superconducting wire is spirally wound.
  • Superconducting wire is a wire comprising an oxide superconducting phase, specifically, REBa 2 Cu 3 O x (RE123, RE is a rare earth element), for example, a thin film comprising a rare earth oxide superconducting phase such as YBCO, HoBCO, GdBCO.
  • high-temperature superconducting wires that comprise a wire and a Bi-based oxide superconducting phase such as Bi 2 Sr 2 Ca 2 Cu 3 O 10 + ⁇ (Bi2223) and Ag or an alloy thereof as a metal matrix.
  • an interlayer insulating layer in which insulating paper such as kraft paper is wound can be formed between the layers of the wire layers.
  • An inner semiconductive layer can be provided by winding carbon paper or the like directly on the superconducting conductor layer 102.
  • the outer superconducting layer 104 can be used as, for example, a magnetic shield in the case of AC power transmission, or a return conductor or a neutral wire in the case of DC power transmission.
  • the number of superconducting wires constituting the superconducting conductor layer 102 and the outer superconducting layer 104 and the number of wire layers are designed according to the desired power supply capacity.
  • the electrical insulating layer 103 can be formed by winding an insulating tape material such as semi-synthetic insulating paper such as kraft paper or PPLP (registered trademark) on the superconducting conductor layer 102 (or inner semiconductive layer). .
  • An outer semiconductive layer can be provided by winding carbon paper or the like directly on the electrical insulating layer 103.
  • a normal conducting shield layer can be provided on the outer periphery of the outer superconducting layer 104 to be used for the above-mentioned accident current induction path.
  • the normal conductive shield layer can be formed, for example, by winding a metal tape material made of a normal conductive material such as copper.
  • a protective layer 105 can be provided.
  • the above-described cable core 100 is used as a constituent member of a superconducting cable.
  • a superconducting cable is manufactured by housing one or a plurality of (typically three) cores 100 in one heat insulating tube (not shown).
  • the heat insulation pipe is typically composed of a double pipe of an inner pipe and an outer pipe, and a vacuum heat insulation structure in which a vacuum is drawn between the inner pipe and the outer pipe.
  • a superconducting cable is used in a power supply path by filling a heat insulating pipe with a refrigerant (for example, a liquid refrigerant such as liquid nitrogen or liquid helium), cooling the superconducting conductor layer 102 or the outer superconducting layer 104 with this refrigerant, and making it superconducting.
  • a refrigerant for example, a liquid refrigerant such as liquid nitrogen or liquid helium
  • a lead electrode 210 is attached to each end of the cable core 100 (superconducting conductor layer 102, outer superconducting layer 104) via a connecting portion 200 as shown in FIG.
  • the lead electrode 210 and the connecting portion 200 can be made of an appropriate shape and length made of an appropriate conductive material such as copper or a copper alloy so that current can be applied or applied.
  • the drum 10 that winds up the cable core 100 will be described with reference to FIGS.
  • the drum 10 includes a cylindrical winding drum 11, and annular flanges 12A (FIG. 2) and 12B that protrude outward from the winding drum 11 from the peripheral edges of the winding drum 11, respectively.
  • the constituent materials of the constituent members are resistant to the refrigerant, and the cable core 100 is A material having a rollable strength is suitable.
  • a high-strength metal material such as high carbon steel or stainless steel can be used. Metal materials generally shrink when cooled, and the iron-based alloy has a smaller coefficient of linear expansion (linear expansion coefficient) than copper or copper alloy. There is also a risk of becoming smaller.
  • the drum 10 (especially the winding drum 11) is made of the above-described iron-based alloy, in Embodiment 1, the winding drum 11 and the core 100 are made to cool in a specific order as described later.
  • the core 100 is prevented from being damaged when the heat shrinks.
  • the winding drum 11 and the flanges 12A and 12B are typically made of the same material.
  • the collar may be made of a material different from that of the winding drum 11.
  • Examples of the winding drum 11 include those having a circular outer cross section. Specifically, a case where the winding drum is configured with a cylindrical member, a configuration in which a plurality of arc pieces having a fan-shaped cross section are arranged on the circumference, and a configuration in which a plurality of bar members are arranged on the circumference are exemplified.
  • the winding drum 11 is a cylindrical body as described above, and its outer peripheral surface is formed of a smooth surface.
  • the winding drum 11 is formed of a cylindrical body, it is easy to wind up the core 100 if the outer peripheral surface of the cylindrical body is provided with an alignment groove or alignment partition for aligning the turns formed by the cable core 100.
  • the winding drum 11 is a hollow cylinder, it is lightweight, and after being stored in the cooling container 1, the inner circumferential space of the winding drum 11 can be filled with a refrigerant, so that the core 100 is finally made efficient. Can cool well. This also applies to the case where the winding drum 11 is composed of a plurality of arc pieces and rods.
  • the axial length of the winding drum 11 may be selected according to the length of the core 100.
  • the winding drum 11 can be efficiently cooled, and the winding drum 11 can be cooled and thermally contracted before the cable core 100 wound around the winding drum 11.
  • the flow passage 14 may be formed by arranging a pipe so as to be in contact with the inner peripheral surface of the winding drum 11.
  • the pipe is meandered so as to vibrate in the axial direction of the winding drum, and is annular along the circumferential direction of the winding drum 11, and the flow passage 14 is provided in the entire circumferential direction of the winding drum 11. It is a form. Or it can be set as the form which provides the piping wound as the flow path 14 at coil shape.
  • the entire winding drum 11 is easily cooled by the refrigerant introduced into the pipe.
  • the coolant gradually cools the winding drum 11 while passing through a pipe lengthened by meandering or winding, so that the temperature gradually increases, and the refrigerant discharged from the pipe is more than the refrigerant introduced into the pipe.
  • the temperature is also rising slightly.
  • one end of the pipe constituting the flow passage 14 is arranged so as to protrude from one end side (one flange 12A side) in the axial direction of the winding drum 11 to serve as the refrigerant inlet 14i.
  • the other end is opened to the other end side (the other flange 12B side) of the winding drum 11 to serve as a refrigerant discharge port 14o.
  • the arrangement position of the discharge port 14o can be appropriately selected.
  • the discharge port 14o may be disposed at the center portion in the axial direction of the winding drum 11, or may be on the flange portion 12A side similarly to the introduction port 14i.
  • the refrigerant flow passage 14 may include a form in which at least one, preferably a plurality of straight pipes are prepared and arranged so as to contact the inner peripheral surface of the winding drum 11.
  • the thickness of the winding drum 11 is increased, and at least one, preferably a plurality of through-holes penetrating from one flange portion 12A to the other flange portion 12B are provided, that is, a form using this through-hole, that is, A form in which a flow path is formed in the winding drum 11 itself can be mentioned.
  • the winding drum 11 can be configured by paralleling a plurality of pipes in the circumferential direction, and the piping can be used, that is, the entire winding drum 11 can be a flow path.
  • Constituent materials of members such as piping constituting the flow passage 14 are also the same as the constituent materials of the drum 10 because they contact and immerse in the refrigerant.
  • the winding drum 11 has a double structure of an inner wall and an outer wall, one end is closed in a bag shape, the other end is opened, and a refrigerant is filled between the inner wall and the outer wall.
  • coolant flow out from an end is mentioned.
  • the winding drum 11 is in contact with the refrigerant directly or through the flow passage 14, and therefore, the cooling is performed before the cable core 100.
  • the collar parts 12A and 12B are typically toric bodies. If the outer diameters of the flange portions 12A and 12B are larger than the outer diameter of the turn formed by the cable core 100, the end surfaces of the turns can be held by the flange portions 12A and 12B, and it is easy to prevent collapse.
  • At least one of the flanges 12A and 12B can be formed in a form in which a plurality of arc pieces are combined and arranged in an annular shape, or in a form in which a part of the annular body is provided with a notch. In the case of the former, it can be set as the form in which the collar part is not provided in a part of the circumferential direction of the winding drum 11. The end portion of the cable core 100, the lead electrode 210, and the like can be pulled out from the gap portion where the flange portion does not exist or the above-described notched portion.
  • the flanges 12A and 12B are typically held in the winding drum 11 integrally.
  • at least one of the collar parts 12A and 12B (here, one collar part 12A as shown in FIGS. 1 and 2C, etc.) can be attached to and detached from the winding drum 11. It can be.
  • the winding drum 11 and the flange 12A can be easily attached and detached by screwing one end of the winding drum 11 to the flange 12A. More specifically, when the winding drum 11 is composed of a cylindrical member or an arc piece, the end portions of these members are aligned with the inner peripheral surface of the flange portion 12A, and the bolts are attached and detached so as to penetrate both of them.
  • the test object can be stored in the cooling container 1 with the one flange portion 12A removed.
  • the absence of the collar portion 12A prevents the lead electrode 210 and the like from coming into contact with the collar portion 12A, and the lead electrode 210 and the like do not need to be detoured in order to avoid contact with the collar portion 12A. Further, since there is no collar portion 12A, the weight of the stored item can be reduced.
  • a shape holding member 13 for preventing collapse can be attached to the other flange 12B on the outer periphery of the core 100 wound around the winding drum 11.
  • the shape holding member 13 may be a split member such as a plurality of rod-like bodies, strip-like bodies, or arc pieces, and may be configured to be detachable from the collar portion 12B.
  • a mounting portion for the shape holding member 13 is provided on the other flange 12B.
  • the hole 12B is provided with a hole or groove into which the divided member is inserted, and the divided member is provided with a flange part that stops when inserted into the hole or groove.
  • the part 12B may be fixed with a bolt or the like.
  • the constituent material may be a material having excellent resistance at the refrigerant temperature, for example, a high-strength material such as stainless steel.
  • the shape holding member 13 is attached to the flange 12B at an outer position than the outer diameter of the core 100 before cooling (the outer peripheral side of the flange 12B from the core 100 wound around the winding drum 11) to maintain the shape. The position is adjusted so that the core 100 is not pressed when the member 13 is thermally contracted.
  • Such divided members may be arranged in an annular shape and appropriately spaced between the divided members so as to surround the outer periphery of the core 100 wound around the winding drum 11.
  • the cable core 100 is typically wound on the drum 10 in a single layer, but can be wound in multiple layers.
  • a drum body member (not shown) serving as the second and subsequent drums is attached to at least the flange portion 12B.
  • the winding drum member is constituted by a plurality of divided members like the shape retaining member 13 described above, it is easy to attach.
  • the constituent material of the winding drum member the same constituent material as that of the winding drum 11 can be used.
  • the winding drum member is, for example, in an annular shape so as to surround the outer periphery of the wound lower layer core 100, and outside the outer diameter before cooling of the lower layer core 100 with respect to the flange 12B. Arrangement is mentioned.
  • the cooling container 1 includes a main body 2 that is a box-shaped body that is open on one side, and a lid 3 that closes the opening of the main body 2 (FIGS. 1 and 2D).
  • the main body 2 has a vacuum heat insulating structure including a vacuum layer 2a, and includes a mounting portion 21 for attaching the lid 3 to the opening side.
  • the main body 2 is excellent in resistance to the refrigerant temperature (for example, about 77K in the case of liquid nitrogen), and is made of a high-strength material capable of holding the heavy weight of the test object such as the cable core 100 wound around the drum 10. Can be suitably used.
  • the constituent material of the main body 2 include stainless steel.
  • the main body 2 has a volume that can sufficiently store the test object.
  • the lid 3 is a member for sealing the refrigerant in the cooling container 1 (here, the liquid refrigerant 2L (FIG. 1) and the gas phase formed above the liquid refrigerant 2L).
  • the lid 3 can also have a vacuum heat insulating structure, but when the lead electrode 210 and other lead wires 220 and 230, which will be described later, are drawn out, the structure is complicated.
  • the lid 3 may be a solid body (for example, a plate made of stainless steel) and may include a lead electrode 210, lead wires 220 and 230, a through-hole for drawing out the pipes constituting the flow passage 14, and the like. Even if it is solid, it is preferable to attach an appropriate cooling mechanism to the lid 3 so that excessive vaporization of the liquid refrigerant 2L due to intrusion heat from the lid 3 can be prevented.
  • Control device When the cable core 100 wound around the drum 10 is stored in the cooling container 1 and cooled by the refrigerant, or the temperature is raised after cooling, the core 100 is cooled or heated as slowly as possible, and heat shrinkage per unit time. Preventing the amount or thermal expansion from becoming excessive can effectively prevent damage to the core 100 due to thermal contraction or thermal expansion. For example, it is preferable to adjust the cooling rate or the heating rate so that the core 100 gradually heat shrinks or expands. Therefore, as shown in FIG. 1, the temperature of the core 100 can be grasped, and the controller 4 that adjusts the cooling rate or the temperature rising rate according to the measured temperature can be provided.
  • the core 100 is attached with a temperature sensor (a T-shaped circle in FIG. 1) for measuring the temperature.
  • the temperature sensor may be an appropriate one that can be used even at the refrigerant temperature, for example, a platinum resistance temperature detector.
  • a temperature sensor may also be attached to the drum 11 of the drum 10.
  • the control device 4 has an input interface (IF) 41 to which information from the temperature sensor is input, and a calculation means 42 for calculating a cooling rate and a temperature increase rate of the cable core 100 based on the input information.
  • Determining means 43 for determining whether the cooling rate or the temperature rising rate is within the threshold value, and the refrigerant supply or temperature rising operation so as to adjust the refrigerant supply state or the temperature rising state when the cooling rate or the temperature rising rate exceeds the threshold value
  • a command means 44 for commanding a corresponding member (such as a temperature raising power source 310 described later).
  • control device 4 includes storage means 45 for storing various data such as threshold values, direct input means (not shown) for the operator to directly input data such as threshold values, input information and calculation results, determination
  • storage means 45 for storing various data such as threshold values, direct input means (not shown) for the operator to directly input data such as threshold values, input information and calculation results, determination
  • a display means 46 for displaying a result or the like can be provided.
  • the core 100 is wound around the drum 10 as shown in FIG.
  • the drum 10 is arranged so that its axis is parallel to the horizontal plane, and when the core 100 is wound while being rotated by an appropriate rotation mechanism (not shown), each turn of the core 100 is It is preferable that the dead weight applied to the is uniform.
  • the manufactured core 100 may be sequentially wound up by the drum 10. In the case of multi-layer winding, the above-described winding body member is attached to each layer.
  • the shaft of the drum 10 is cooled when at least the mounting area of the core 100 is a flat surface of the bottom surface of the cooling container 1.
  • the container 1 can be stored so as to be parallel to the bottom surface of the container 1 (hereinafter, this storage form is referred to as horizontal storage).
  • this storage form is referred to as horizontal storage.
  • the action state of the tension is different between the portion positioned in the vertical direction and the portion positioned in the vertical direction. Specifically, the portion positioned above the vertical direction is relatively easy to apply tension, and the portion positioned below the vertical direction is relatively difficult to apply tension.
  • the drum 10 is vertically stored so that the axis of the drum 10 is parallel to the axis of the cooling container 1 in the depth direction.
  • the drum 10 around which the core 100 is wound is rotated by 90 ° as shown in FIG. 2B, and the drum 10 is disposed so that the axis of the drum 10 is orthogonal to the horizontal plane.
  • one flange 12A (opening side of the cooling container 1) may be removed. Further, in order to prevent the cable core 100 from collapsing due to the removal of the flange portion 12A, the shape holding member 13 may be disposed on the outer periphery of the core 100 and fixed to the other flange portion 12B. Furthermore, in the case of providing a refrigerant flow passage 14 (not shown in FIG. 1 and FIG. 2) using the above-described pipe, the pipe may be fixed to the inner peripheral surface of the winding drum 11. The flow path 14 can also be attached in a state where the test object is stored in the main body 2 of the cooling container 1.
  • the lead electrode 210 attaches to each end of the cable core 100.
  • the collar portion 12A is removed, or the shape holding member 13 is in the form of a plurality of divided members, or the collar portion of the collar portion 12A is provided with a notch, the divided member It is easy to pull out the end of the core 100 from a gap or notch.
  • the lead electrode 210 can be easily attached to each end of the core 100, and the workability is excellent.
  • temperature sensors can be attached to appropriate positions of the core 100 and the drum 10.
  • a lead wire 230 is connected to the temperature sensor so that measurement information can be input to the control device 4 (FIG. 1).
  • the lead wire 220 can be attached to the former 101.
  • the lead electrode 210, the temperature sensor, and the lead wires 220 and 230 can be attached in a state where the test object is stored in the main body 2 of the cooling container 1.
  • test object including the lead electrode 210 and the like (the cable core 100 wound around the drum 10) is stored in the main body 2 of the cooling container 1. Here, it is set as vertical storage as described above.
  • the test object is fixed to the cover 3 in a suspended state, and the cover 3 is placed on the main body 2. It is mentioned that it moves.
  • the suspension of the test object from the lid 3 is performed by attaching a wire, a support rod (not shown), or the like at an appropriate location on the back surface of the lid 3 (the surface facing the inside of the main body 2) and the winding drum 11 or the flange 12B. What is necessary is just to support with the appropriate suspension material.
  • the lead electrode 210 and the lead wires 220 and 230 are preferably fixed to the lid 3.
  • one end of the pipe is also fixed in a state of being suspended from the lid 3.
  • an introduction member that can be connected to the pipe serving as the flow passage 14 may be provided in the lid 3 in advance, and one end of the pipe may be connected to the introduction member.
  • insertion points such as the lead electrode 210, the lead wires 220 and 230, and the piping that becomes the flow passage 14 are sealed using, for example, a bushing or a hermetic seal.
  • the test object is housed inside the main body 2 while being suspended from the lid 3, and the lid 3 is further lowered to place the lid 3 on the opening edge of the main body 2.
  • the lid 3 After the lid 3 is placed on the main body 2, the lid 3 is fixed to the main body 2 (FIG. 1). By this step, the storage in the cooling container 1 to be tested and the sealing (closing) of the cooling container 1 by the lid 3 can be performed almost simultaneously.
  • the flange portion 12B of the drum 10 may be in contact with the bottom surface of the main body portion 2, but is preferably non-contact. Thereby, the drum 10 and the cable core 100 wound around the drum 10 can be uniformly cooled.
  • the length of the suspension member that suspends the test object from the lid 3 can be adjusted so that the collar portion 12B is separated from the bottom surface of the main body portion 2 and is not in contact.
  • a liquid refrigerant 2L (for example, liquid nitrogen) is filled into the main body 2 from an appropriate supply port (not shown) of the cooling container 1.
  • the liquid refrigerant 2L is introduced from one end (inlet 14i) of a pipe that becomes the refrigerant flow passage 14.
  • the liquid refrigerant 2L introduced into the flow passage 14 first cools the winding drum 11 of the drum 10 provided with the flow passage 14.
  • the refrigerant that has passed through the flow passage 14 is discharged from the other end (discharge port 14o (FIG. 3)) of the pipe.
  • discharge port 14o FIG. 3
  • the discharge port 14o opens to the bottom side of the cooling container 1, so that the refrigerant that has passed through the flow path 14 is filled from the bottom side of the cooling container 1 toward the lid part 3 side.
  • the cable core 100 is cooled by this refrigerant. Since the temperature of the refrigerant passing through the flow passage 14 is slightly higher than that of the introduced refrigerant, the core 100 is less likely to be cooled than the winding drum 11, that is, the cooling rate is slow. Therefore, by introducing the liquid refrigerant 2L into the flow passage 14 attached to the winding drum 11, the core 100 can be thermally contracted after the winding drum 11 has been cooled and sufficiently thermally contracted.
  • the temperature of the cable core 100 is measured by the temperature sensor, the cooling rate of the core 100 is obtained by the control device 4 (calculation means 42), and the refrigerant is introduced so that the cooling rate of the core 100 is within a predetermined range.
  • the supply state of the refrigerant can be adjusted by changing conditions (refrigerant temperature, flow rate per unit time, introduction time, introduction stop / restart, etc.). For example, if the determination unit 43 determines that the cooling rate is out of a predetermined range, the command unit 44 instructs the control unit (not shown) of the refrigerant supply mechanism (not shown) to adjust the introduction condition.
  • the control device 4 may be configured.
  • the control device 4 can be configured to adjust the introduction condition.
  • the core 100 can be more thermally contracted after the thermal contraction of the winding drum 11.
  • FIG. 1 by arranging a temperature sensor in each turn of the core 100, it is easy to grasp the cooling state of each turn.
  • the turn arranged on the bottom side of the cooling container 1 is cooled in contact with the liquid refrigerant 2L in the initial stage after the supply of the liquid refrigerant 2L is started, and the cooling rate becomes large (fast). easy.
  • a temperature sensor is attached at least in the core 100 where the cooling rate tends to increase, it is easy to control the thermal contraction state of the core 100. Also, in a form in which the temperature of the winding drum 11 can be grasped by attaching a temperature sensor to the winding drum 11 of the drum 10, for example, after confirming that the winding drum 11 is sufficiently cooled (reduced in diameter).
  • the cooling rate of the core 100 can be increased by increasing the introduction rate of the liquid refrigerant 2L.
  • the superconducting layer such as the superconducting conductor layer 102 (FIG. 10) provided in the cable core 100 is brought into a superconducting state by the liquid refrigerant 2L filled in the cooling container 1.
  • a desired energizing or applying power source 300 is attached to the lead electrode 210, and desired electrical characteristics (such as energization performance and insulation performance) are examined.
  • the winding drum 11 of the drum 10 When the temperature of the cable core 100 is raised, the winding drum 11 of the drum 10 is in a state where the winding drum 11 has become smaller due to thermal contraction (a reduced diameter state).
  • the core 100 can be prevented from being damaged by being pressed by the winding drum 11 without being in contact with the core. Therefore, when raising the temperature of the test object, the temperature of the core 100 is first raised.
  • the core 100 includes a former 101 made of a normal conducting material such as copper or a copper alloy, the Joule heat of the former 101 can be used for heating the core 100. Therefore, as shown in FIG. 1, a power supply 310 for heating is attached to the lead wire 220, and the former 101 is energized.
  • the temperature of the cable core 100 is measured by the temperature sensor, the temperature increase rate of the core 100 is obtained by the control device 4 (calculation means 42), and the energization condition (
  • the temperature rise state can be adjusted by changing the energization current value, energization time, energization stop / restart, etc.
  • the control unit 44 instructs the control unit (not shown) of the temperature increase power supply 310 to adjust the energization condition. 4 is included.
  • a heater (not shown) can be used for heating the core 100 separately.
  • a heater is attached in advance to the outer periphery of the core 100, and the core 100 in a state where the heater is disposed is accommodated in the cooling container 1.
  • the heater an appropriate material and shape that can be used even at the refrigerant temperature can be used.
  • a sheet-like heater it can be easily disposed so as to cover the outer periphery of the core 100.
  • a plurality of small rod-shaped heaters may be prepared and attached to the outer periphery of the core 100 as appropriate.
  • the lead wire 220 may be connected to the heater and further connected to the temperature raising power source 310. Since the heater is a member independent of the core 100, it is easy to connect the lead wires 220, and the workability is excellent. In addition, the heating time can be shortened by increasing the current-carrying capacity of the heater or using a heater that generates a large amount of heat. When using a heater that generates a large amount of heat, the heater will not burn out even if the energizing current is increased.
  • the outer diameter of the winding drum 11 is reduced, so that the core 100 and the wound core 100 are wound. There is a gap between the drum 11 and the winding drum 11 is not substantially tightened.
  • the outer diameter of the winding drum 11 of the drum 10 and the winding diameter of the core 100 are substantially the same.
  • the outer diameter of the winding drum 11 can be made sufficiently smaller than that before cooling, and a gap is provided between them. By utilizing this gap as a clearance for heat shrinkage of the core 100, the heat shrinkage of the core 100 can be absorbed.
  • the test method of the cable core for the superconducting cable according to the first embodiment can suppress damage to the cable core 100 due to heat shrinkage, and can perform a full length test while maintaining the core 100 in a healthy state. Industrial significance is high.
  • the core 100 can be prevented from undergoing rapid thermal contraction. From the point of view, damage to the core 100 can be prevented.
  • the winding drum 11 of the drum 10 when the winding drum 11 of the drum 10 is cooled before the cable core 100, the winding drum 11 can be efficiently cooled by providing the flow passage 14 for the refrigerant in the winding drum 11. Further, as described above, by adopting a configuration in which the core 100 is cooled by the refrigerant that has passed through the flow passage 14, the cooling rate of the core 100 can be further reduced (slow), and the core 100 is gradually contracted by heat. Can do. From this point, it is easier to prevent the core 100 from being damaged.
  • the core 100 when the temperature is increased after the measurement is completed, the core 100 is thermally expanded by increasing the temperature of the cable core 100 before the winding drum 11 of the drum 10 contrary to the cooling. In this case, the winding drum 11 is still at a low temperature and is in a reduced diameter state. Therefore, this embodiment can effectively prevent the core 100 from being damaged by being in contact with the winding drum 11 that has expanded during the thermal expansion of the core 100. Since the gap is provided between the core 100 and the winding drum 11 when the winding drum 11 is thermally expanded due to the temperature rise, the core 100 can be prevented from being damaged in this case as well. In particular, if the core 100 is heated using the Joule heat of the former 101, the former 101 that substantially defines the amount of thermal expansion of the core 100 can be heated efficiently. In particular, when the temperature of the core 100 is increased using a heater, the temperature increase rate of the core 100 can be easily increased.
  • vertical storage allows the size of the bottom surface of the cooling container 1 to be sized according to the diameters of the flanges 12A and 12B of the drum 10.
  • the main body 2 of the cooling container 1 only needs to have a size such that the diameter of the bottom is slightly larger than the diameter of the other flange 12B.
  • the vertical storage can reduce the size of the cooling container 1, particularly the installation area, compared to the horizontal storage, and the cooling container 1 can be downsized.
  • the cooling container 1 that houses the cable core 100 needs to have a volume including the drum 10 and is large. If the cooling container 1 is large, the amount of refrigerant charged in the cooling container 1 also increases, leading to an increase in filling time. An increase in the filling time may lead to an increase in the test time including the filling time. Furthermore, an increase in the amount of refrigerant causes an increase in test costs. Therefore, when the drum 10 and the cooling container 1 are stored, it is desirable to make the cooling container 1 as small as possible. In the vertical storage configuration, in addition to the above-described downsizing, it is possible to shorten the filling time of the liquid refrigerant 2L and reduce the cost by reducing the amount of refrigerant.
  • the core wound around the drum 10 is heavy, it is also desired that the core can be stored in the cooling container as easily as possible. As described above, it is possible to reduce the weight of the stored item in the cooling container 1 by removing the one flange portion 12A.
  • Embodiments 2 and 3 which will be described later, also perform vertical storage as in Embodiment 1, so that the above-described effects (miniaturization, weight reduction, uniform tension of the cable core 100, reduction in the amount of refrigerant, core 100 Storage and the closing of the refrigerant container 1).
  • the second embodiment is a form in which a drum having a relaxation structure is used when performing a full length test of a cable core for a superconducting cable.
  • This form has the main feature in the structure of the drum.
  • the drum 10A that winds up the cable core 100 will be mainly described with reference to FIGS. 4 and 5, and the description of the same configuration and effect as those of the first embodiment will be omitted.
  • the drum 10A includes a winding drum 11 and an annular flange 12A attached to one end of the winding drum 11.
  • the cable core 100 is cooled by being stored in the cooling container 1 while being wound around the drum 10A.
  • the drum 10A has a relaxation structure that changes the outer peripheral contour diameter of the winding drum 11 when the core 100 is cooled, thereby responding to changes in the winding diameter caused by thermal contraction due to cooling of the core 100.
  • the relaxation structure is a mechanism that changes the outer peripheral contour diameter of the winding drum 11 beyond the amount of contraction of the constituent material of the winding drum 11 during cooling. The configuration of each part will be described below.
  • the winding drum 11 provided in the drum 10A is composed of a plurality of long materials 11L arranged on the circumference, and has a circular outer peripheral contour (a circumscribed circle of a rod-shaped body).
  • the long material 11L include a rod material, a circular arc piece having a circular cross section, and a pipe material.
  • a round bar is used as the long material 11L.
  • the round bar material may be selected according to the diameter and length of the cable core 100 wound around the winding drum 11. For example, the diameter is about 1 cm to 10 cm, the length is about 30 cm to 100 cm, and the number is about 10 to 50. Available.
  • the long material 11L is detachable with respect to the flange 12A, and there are at least two attachment positions for the flange 12A, a large diameter position and a small diameter position.
  • the large diameter position is the attachment position of each long material 11L corresponding to the winding diameter when the cable core 100 is wound around the winding drum 11 at room temperature
  • the small diameter position is the winding diameter of the core 100 that has cooled and contracted. It is the attachment position of each long material 11L corresponding to.
  • Both the large-diameter position and the small-diameter position are configured by arranging a plurality of long material 11L attachment portions on the circumference.
  • the relaxed structure is configured by changing the diameter of the winding drum 11 by changing the long material 11L between the large diameter position and the small diameter position.
  • screw connection can be suitably used.
  • a male screw is formed at the tip of the round bar, and a female screw corresponding to the male screw is formed in the flange portion 12A. Then, the long material 11L can be freely attached to and detached from the flange 12A by fitting and removing the round bar from the flange 12A.
  • the collar portion 12A can typically use a torus. If the outer diameter of the flange portion 12A is larger than the outer diameter of the turn formed by the cable core 100, the end face of the turn can be held by the flange portion 12A as in the first embodiment, and the core 100 can be easily prevented from collapsing. Further, as described above, attachment portions of the long material 11L constituting the winding drum 11 are formed on the flange portion 12A at the large diameter position and the small diameter position.
  • the flange 12A may be either attached to only one end of the winding drum 11 (one-sided type) or attached to both ends (two-sided type).
  • the drum 10A in the case of a single-sided type, the drum 10A can be reduced in weight, and the long material 11L can be easily replaced.
  • the both-side type a strong winding drum can be formed.
  • the cable core 100 wound around the drum 10A is stored in the cooling container 1 as described in the first embodiment, it is a single-sided type or a double-sided type. Since there is no one flange, it is not necessary to lengthen the lead electrode 210.
  • the drum 10A with a shape holding member 13 on the outer periphery of the cable core 100 wound around the winding drum 11 as shown in FIG. 5 (C).
  • a shape holding member 13 on the outer periphery of the cable core 100 wound around the winding drum 11 as shown in FIG. 5 (C).
  • the shape holding member 13 it is preferable to attach to the flange portion 12A.
  • the mounting position, shape, material, and the like of the shape holding member 13 are the same as those described in the first embodiment.
  • the attachment structure of the flange portion 12A and the shape maintaining member 13 includes the attachment structure of the long member 11L and the flange portion 12A constituting the winding drum 11, in addition to the flange connection using the bolt as described in the first embodiment. The same can be done.
  • the constituent material of the constituent members of the drum 10A can be an iron-based alloy such as high carbon steel or stainless steel. Since the iron-based alloy has a smaller linear expansion coefficient than copper and copper alloy as described above, a cable core 100 having a former 101 (FIG. 10) made of copper or copper alloy is wound around a drum having no relaxation structure. When cooled, excessive stress may act on the core 100 due to thermal contraction of the core 100. On the other hand, in the drum 10A of the present example having the relaxation structure, the excessive stress is generated by changing the outer peripheral contour diameter of the winding drum 11 itself regardless of the linear expansion coefficient of the material constituting the drum 10A. Can be suppressed. Therefore, the drum 10A of this example has a wide variety of constituent materials.
  • At least the winding drum 11 has a thermal contraction rate (wire) more than that of the constituent material of the cable core 100, that is, the main member that shares the tension acting on the core 100, i.e. It is also preferable to use a material having a large expansion coefficient).
  • An example of the tensile material is a former 101 made of a normal conductive metal material such as copper or a copper alloy as described above. Therefore, the winding drum 11 of the drum 10A is typically made of a material having a sufficiently larger thermal shrinkage than copper or a copper alloy that is a constituent material of the former 101, for example, aluminum, aluminum alloy, magnesium, or magnesium alloy. What is done.
  • the drum 10A is made of such a material, when the cable core 100 is cooled, the outer peripheral contour diameter of the winding drum becomes smaller than the reduction amount of the winding diameter, so that there is a gap between the core 100 and the winding drum 11. It is possible to prevent excessive stress from acting on the core 100 by this gap.
  • Aluminum, magnesium, and their alloys have a higher thermal shrinkage than the constituent materials of former 101 (copper, etc.), and (1) are lightweight and can reduce the weight of the test object.
  • (2) Non-magnetic For example, even when a test with a large energization current value is performed, there is an advantage that the magnetic field generated by the cable core 100 is hardly disturbed.
  • aluminum and its alloys have excellent corrosion resistance
  • magnesium and its alloys have the highest specific strength and specific rigidity among structural metals, and can be used as a high-strength drum.
  • the winding drum 11 and the flange portion 12A are typically made of the same material. In a form in which one hook part is detachable, the hook part may be made of a material different from that of the winding drum 11.
  • the cable core 100 may be a single layer winding or a multilayer winding with respect to the drum 10A.
  • the drum 10A is also attached to at least the flange portion 12A with a winding drum member (not shown) serving as a winding drum for the second and subsequent layers instead of the shape maintaining member 13 as described in the first embodiment.
  • the shape, arrangement position, and material of the winding drum member are the same as those described in the first embodiment.
  • this winding drum member is also made of the same material as that of the above-described winding drum 11, thereby preventing damage to the core 100 in the second and subsequent layers.
  • Test method A procedure for winding the above-described cable core 100 around the drum 10A having the relaxation structure and performing a test for examining the electrical characteristics over the entire length of the core 100 will be described.
  • the long material 11L is attached to the attachment portion at the large-diameter position of the flange portion 12A to constitute the drum 10A.
  • the cable core 100 is wound around the drum 10A (FIG. 5 (B)). At this time, it is preferable to wind the core 100 by installing the drum 10A on an appropriate turntable (not shown) and rotating the drum 10A.
  • the manufactured cores 100 may be sequentially wound by the drum 10A.
  • the above-described winding body member is attached to each layer.
  • the shape retaining member 13 is attached to the outer periphery of the cable core 100 in the collar portion 12A (FIG. 5C).
  • the core 100 is disposed between the long material 11L constituting the winding drum 11 and the shape maintaining member 13.
  • the long material 11L constituting the winding drum 11 is removed from the attachment portion at the large diameter position and is replaced with the attachment portion at the small diameter position of the flange portion 12A (FIG. 5 (D)).
  • a gap having a size based on the difference between the large diameter position and the small diameter position can be provided between the winding drum 11 and the cable core 100.
  • the core 100 does not collapse due to this gap. This is because the collapse of the core 100 is likely to occur when the turn of the core 100 is shifted to the outer peripheral side of the core 100. Therefore, if the outer peripheral side of the core 100 is supported by the shape holding member 13, the collapse can be suppressed.
  • the drum 10A around which the core 100 is wound can be stored in the cooling container 1 in the same manner as in the first embodiment. Specifically, the drum 10A is suspended from the lid 3, the lead electrode 210 is attached to the connecting portion 200 at the end of the core 100, and the lead electrode 210 is passed through the lid 3 (FIG. 5 (E)). . It is preferable that the drum 10A is suspended from the lid portion by connecting the lid portion 3 and the flange portion 12A with an appropriate suspension material (indicated by a one-dot chain line in FIGS. 4 to 6).
  • the suspension of the drum 10A is preferably performed so that the axis of the drum 10A is orthogonal to the creeping direction of the lid portion 3.
  • the penetration part of the lead electrode 210 is sealed using, for example, a bushing or a hermetic seal.
  • the lead electrode 210 may be attached to the core 100 after the test object is stored in the main body 2 of the cooling container 1.
  • the drum 10A around which the cable core 100 is wound is moved into the main body 2 while being suspended from the lid 3.
  • the drum 10A is stored so that the axis of the drum 10A is parallel to the axis of the cooling container 1 in the depth direction (vertical storage).
  • the test object suspended from the lid 3 is moved so that, for example, the lid 3 is placed on the opening edge of the main body 2 as shown in FIG.
  • the test object is housed inside the main body 2 while being suspended from the lid 3, and the lid 3 is further lowered to place the lid 3 on the opening edge of the main body 2.
  • the lid part 3 is fixed to the attachment part 21 of the main body part 2 (FIG. 6).
  • the cooling medium 1 is filled with the liquid refrigerant 2L as in the first embodiment.
  • the main body 2 is filled with liquid refrigerant 2L (for example, liquid nitrogen) from an appropriate supply port (not shown) of the cooling container 1.
  • the filling of the liquid refrigerant 2L into the cooling container 1 may be performed before the drum 10A is stored in the main body 2.
  • the cable core 100 is cooled by the liquid refrigerant 2L, and superconducting layers such as the superconducting conductor layer 102 (FIG. 10) are brought into a superconducting state.
  • the core 100 is thermally contracted and the winding diameter thereof is reduced, but the winding drum 11 is configured by replacing the long material 11L with a small diameter position in advance, so that the gap between the core 100 and the winding drum 11 is reduced.
  • the gap is provided. Due to the presence of this gap, even if the core 100 is thermally contracted, the core 100 does not tighten the winding drum 11 and an excessive stress is not applied to the core 100.
  • a desired energizing or applying power source 300 is attached to the lead electrode 210, and desired electrical characteristics (such as energization performance and insulation performance) are examined.
  • the drum 10A has a winding drum 11 composed of a long material 11L that can be switched between a large diameter position and a small diameter position, the long material 11L is attached to the large diameter position before the cable core 100 is cooled.
  • the long material 11L can be replaced at a small diameter position during winding and cooling.
  • a gap can be provided between the core 100 and the winding drum 11 before the core 100 is cooled.
  • the drum 10A can be reduced in weight by forming the winding drum 11 of the drum 10A with a plurality of long materials 11L (in this example, round bars) and forming a single-sided drum 10A.
  • the winding drum is formed of a bar material that is slidable with respect to the collar portion.
  • the drum 10B has the same configuration as that of the drum 10A of the second embodiment described above, except for the point that the configuration of the winding drum and the relaxation structure is different from that of the second embodiment, and the test procedure of the cable core 100 using the drum 10B. It is. Hereinafter, differences between the two will be mainly described.
  • This drum 10B is also a single-sided drum, and is similar to the second embodiment in that the winding drum 11 is composed of a plurality of long materials 11L, in this example, rods.
  • the long material 11L is configured to be slidable with respect to the flange portion 12A. That is, the sliding mechanism of the long material 11L becomes a relaxation structure.
  • the collar portion 12A has a disk shape as shown in FIG. 7 (A), but can also have an annular shape as in the second embodiment.
  • Examples of the configuration in which the long material 11L is slid with respect to the flange portion 12A include the following configurations.
  • the long material 11L is screwed into a main shaft 11A having a flange portion 11A F at one end and a male screw portion 11A T at the other end, a pipe material 11B into which the main shaft 11A is inserted, and a male screw portion 11A T of the main shaft 11A. It consists of a nut 11C.
  • the flange portion 12A a plurality of long holes 12A H extending in the radial direction is formed radially.
  • This long hole 12A H is for inserting and sliding the end portion of the long material 11L, and a wide and shallow groove portion 12R, and a slit portion 12S penetrating the flange portion 12A with a narrower width than this groove portion 12R, (FIG. 7C).
  • the end portion of the pipe material 11B is fitted into the groove portion 12R, and the male screw portion 11A T side of the main shaft 11A is penetrated through the slit portion 12S.
  • the male thread portion 11A T penetrating through the slit portion 12S is screwed into the nut 11C on the back surface side of the flange portion 12A (the lower surface side in FIGS. 7B and 7C), and this nut 11C is connected to the flange portion 12A.
  • a compression spring 15 is attached to the groove 12R (FIG. 7B).
  • the compression spring 15 has one end abutted against the pipe material 11B and the other end abutted against the end face of the groove 12R, and normally biases the long material 11L toward the radially outer side of the flange 12A.
  • the nut 11C is loosened to release the long material 11L.
  • the winding diameter is reduced due to the thermal contraction of the core, and the contraction force at that time resists the repulsive force of the compression spring 15 and the long material 11L. Is slid along the long hole 12A H toward the center of the buttock 12. This slide reduces the outer diameter of the outer periphery of the winding drum 11 as the winding diameter of the core is reduced, preventing the core from being pressed against the winding drum 11 and preventing excessive stress from acting on the core. it can.
  • the drum 10B of this example can change the diameter of the winding drum 11 according to the reduction of the winding diameter of the cable core at the time of cooling. As in the second embodiment, it is possible to suppress an excessive stress from acting on the core. Further, by using this drum 10B, the diameter of the winding drum 11 can be changed following the increase in the winding diameter of the core even when the temperature of the core is increased after the test. In particular, when the drum 10B is used, the diameter of the winding drum 11 can be automatically changed by the urging force of the compression spring 15, and the change in the winding diameter of the core can be automatically followed. Therefore, in this embodiment, damage to the core can be prevented by utilizing the slide allowance of the long material 11L as the escape allowance for the thermal contraction of the cable core 100.
  • a configuration in which the compression spring 15 is not used may be employed.
  • it may slide the elongated member 11L along the elongated hole 12A H, by tightening the nut 11C at an appropriate position, to fix the position of the long material 11L.
  • the fixed position of the long material 11L includes a position corresponding to the small diameter position or the large diameter position described in the second embodiment.
  • a clearance serving as a clearance can be provided between the core and the winding drum 11 in advance.
  • Embodiment 2-II Another drum having a relaxation structure is described.
  • This drum (not shown) has a relaxation layer having excellent elastic deformation characteristics on the winding drum.
  • This drum has the same configuration as that of the drum of the second embodiment described above except for the configuration of the winding drum and the relaxation structure, except that the configurations of the drum and the relaxation structure are different from those of the second and second embodiments. It is.
  • differences from Embodiments 2 and 2-I will be mainly described.
  • a hollow cylindrical winding drum is formed of metal, and a relaxation layer that is easily elastically deformed is provided on the outer periphery of the winding drum.
  • a relaxation layer that is easily elastically deformed is provided on the outer periphery of the winding drum.
  • urethane resin or the like can be used.
  • the thickness of the relaxation layer may be a thickness that can secure a deformation amount according to the amount of change in the winding diameter of the cable core before and after cooling.
  • the diameter of the winding drum can be changed by deforming the relaxation layer in accordance with the reduction in the winding diameter of the cable core during cooling. That is, even when the winding diameter is reduced by cooling the core, the reduction of the winding diameter can be absorbed by the deformation of the relaxation layer. Therefore, by using a drum having this relaxation layer, it is possible to suppress an excessive stress from acting on the core as in the second embodiment.
  • the diameter of the winding drum can be automatically changed by deformation of the relaxation layer, and the change in the winding diameter of the core can be automatically followed. Therefore, in this embodiment, the deformation of the relaxation layer can be used as a clearance for heat shrinkage of the cable core 100 to prevent the core from being damaged.
  • the third embodiment is a mode in which a drum made of a specific material is used when performing a full length test of a cable core for a superconducting cable.
  • this embodiment there is a main feature in the material of the drum.
  • the drum 10C that winds the cable core 100 will be mainly described with reference to FIGS. 8 and 9, and the description of the same configuration and effect as those of the first embodiment will be omitted.
  • the basic structure of the drum 10C is the same as that of the first embodiment.
  • Embodiment 3 is characterized in that at least the winding drum 11 in the drum 10C is made of a specific material. Specifically, the winding drum 11 is made of a material having a thermal contraction rate larger than that of the constituent material of the main member (tensile material) that shares the tension acting on the core 100 among the constituent members of the cable core 100. .
  • the tensile material is the former 101 (FIG. 10) made of a normal conducting metal material such as copper or copper alloy as described above. Therefore, the winding drum 11 of the drum 10C includes a material having a sufficiently large thermal contraction rate than the constituent material (copper or copper alloy) of the former 101, for example, one made of aluminum, aluminum alloy, magnesium, magnesium alloy. It is done.
  • Aluminum, magnesium, and alloys thereof have a larger thermal shrinkage rate than that of the former 101 (such as copper), and, as described in the second embodiment, (1) weight reduction of the test object, (2 (3) Aluminum and its alloys have excellent corrosion resistance, and (4) Magnesium and its alloys have high drum strength.
  • the winding drum 11 and the flanges 12A and 12B are typically made of the same material.
  • the flange portion 12A may be made of a material different from that of the winding drum 11.
  • the cable core 100 may be a single layer winding or a multilayer winding with respect to the drum 10C.
  • the drum 10C is also attached to at least the flange portion 12B with a winding drum member (not shown) serving as a winding drum for the second and subsequent layers instead of the shape maintaining member 13 as described in the first embodiment.
  • the form, arrangement position, and material of the winding drum member are the same as those described in the first embodiment.
  • this winding drum member is also made of the same material as that of the above-described winding drum 11, thereby preventing damage to the core 100 in the second and subsequent layers.
  • the cable core 100 wound around the drum 10C is stored in the cooling container 1.
  • vertical storage is performed.
  • the drum 10C around which the core 100 is wound is rotated by 90 ° as shown in FIG. 9B, and is arranged so that the axis of the drum 10C is orthogonal to the horizontal plane.
  • one of the flange portions 12A may be removed and the shape holding member 13 may be disposed on the outer periphery of the core 100.
  • the lead electrode 210 can be attached in a state where the test object is stored in the main body 2 of the cooling container 1.
  • test object (the cable core 100 wound around the drum 10C) including the lead electrode 210 is housed in the main body 2 of the cooling container 1.
  • FIG. 9 (D) shows vertical storage.
  • the test object In order to store the test object in the main body 2, as described in the first embodiment, the test object is fixed in a suspended state on the lid 3, and the lid 3 is placed on the main body 2. It can be moved. The test object may be suspended from the lid 3 and the lead electrode 210 may be fixed in the same manner as in the first embodiment. When the lid 3 is placed on the main body 2, the lid 3 is fixed to the main body 2 (FIG. 8).
  • a liquid refrigerant 2L (for example, liquid nitrogen) is filled into the main body 2 from an appropriate supply port (not shown) of the cooling container 1.
  • the cable core 100 is cooled by the liquid refrigerant 2L, and superconducting layers such as the superconducting conductor layer 102 (FIG. 10) are brought into a superconducting state.
  • a desired energizing or applying power source 300 is attached to the lead electrode 210, and desired electrical characteristics (such as energization performance and insulation performance) are examined.
  • the core 100 is thermally contracted (reduced in diameter) so that the winding diameter thereof becomes smaller. Further, the winding drum 11 of the drum 10C also thermally contracts (shrinks) so that its diameter becomes smaller.
  • the winding drum 11 of the drum 10C is a constituent material of a main member that shares the tension acting on the core 100 among the constituent members of the core 100 (typically, a former 101 formed of copper or a copper alloy (see FIG. Since it is made of a material (for example, aluminum or aluminum alloy) having a larger thermal contraction rate than 10)), it contracts larger than the core 100 (the contraction amount is large).
  • the outer diameter of the winding drum 11 of the drum 10C is substantially the same as the winding diameter of the core 100 before cooling, it is sufficiently larger than the outer diameter of the reduced core 100 when cooled and thermally contracted.
  • a gap is provided between the core 100 and the winding drum 11.
  • the method for testing a cable core for a superconducting cable according to the third embodiment can suppress damage to the cable core 100 due to thermal contraction by using the drum 10C made of a specific material, so that the core 100 can be sound.
  • Full length test can be performed while maintaining the state, and industrial significance is high.
  • Embodiment 2 is not limited to the embodiment described above, and can be appropriately changed without departing from the gist of the present invention.
  • a relaxation layer having excellent elastic deformability can be provided on the outer periphery of the long material 11L of Embodiment 2 or Embodiment 2-I.
  • Embodiment 1 or Embodiment 2 may be combined with Embodiment 3.
  • a drum having the following configuration (A) or (B) is used as a drum used for the full length test of a cable core for a superconducting cable, even if the core is thermally contracted by cooling, the core is excessively applied to the drum. This prevents the core from being damaged.
  • a drum having a relaxation structure A drum having a winding drum that winds up a component of a superconducting cable, and a flange provided at at least one end of the winding drum, The component is a cable core having a superconducting conductor layer, The said drum is a drum provided with the relaxation structure which relieve
  • (B) Drum composed of a specific material A drum that winds up a component of a superconducting cable,
  • the component is a cable core having a superconducting conductor layer
  • the winding drum is a drum made of a material having a thermal contraction rate larger than that of a constituent material of a main member that shares tension acting on the cable core among the constituent members of the cable core.
  • the method for testing a cable core for a superconducting cable according to the present invention can be suitably used for a cable core shipping test, an intermediate test in the middle of manufacturing a superconducting cable, or any other time when investigating the characteristics of the total length of the cable core. it can.
  • Cooling vessel Body 2a Vacuum layer 2L Liquid refrigerant 21 Mounting part 3 Cover 4 Controller 41 Input interface 42 Calculation means 43 Judgment means 44 Command means 45 Storage means 46 Display means 10, 10A, 10B, 10C Drum 11 Winding drum 11L Long material 11A Spindle 11B Pipe material 11C Nut 11A F flange part 11A T male thread part 12A, 12B collar part 12A H long hole 12R Groove part 12S Slit part 13 Shape holding member 14 Flow path 14i Inlet 14o Outlet 15 Compression spring 100 Cable core 101 Former 102 Superconducting conductor layer 103 Electrical insulation layer 104 Outer superconducting layer 105 Protective layer 200 Connection 210 Lead electrode 220,230 Lead wire 300 Power supply 310 Power supply for heating

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

L'invention concerne un procédé d'évaluation d'un cœur de câble pour un câble supraconducteur, permettant d'empêcher un endommagement du cœur de câble en raison de la contraction thermique pendant l'évaluation. Un cœur de câble (100) équipé d'une couche de conducteur supraconducteur et enroulé sur un tambour (10) est préparé comme sujet d'essai. Le sujet d'essai est logé dans un contenant de refroidissement (1), et des caractéristiques sur toute la longueur du cœur (100) sont étudiées pendant que la couche de conducteur supraconducteur est refroidie par un réfrigérant liquide (2L) remplissant le contenant de refroidissement (1) et qu'un état supraconducteur est maintenu. Le cœur est refroidi dans un état dans lequel une autorisation d'échappement pour la contraction thermique du diamètre d'enroulement qui accompagne le refroidissement du cœur (100) est formée sur l'intérieur de spires réalisées par le cœur (100). En raison de l'autorisation d'échappement, un tambour d'enroulement (11) n'est pas aisément serré même lorsqu'une contraction thermique du cœur (100) se produit, et on peut empêcher un endommagement du cœur (100).
PCT/JP2012/076367 2012-10-11 2012-10-11 Procédé d'évaluation d'un cœur de câble pour un câble supraconducteur WO2014057566A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI745478B (zh) * 2016-11-11 2021-11-11 美商富克有限公司 用於非接觸式電壓測量裝置的傳感器子系統
US11746602B2 (en) * 2020-02-27 2023-09-05 Power Feed-Thru Systems And Connectors Llc Systems and methods for testing electrical properties of a downhole power cable
CN116793847A (zh) * 2023-08-29 2023-09-22 天津市小猫线缆股份有限公司 一种柔性矿物绝缘防火电缆线芯拉力试验设备

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JPS50144479A (fr) * 1974-05-09 1975-11-20
JPH05312879A (ja) * 1992-05-15 1993-11-26 Sumitomo Electric Ind Ltd 極細多芯超電導線の断線検査方法および断線検査装置
JP2004150809A (ja) * 2002-10-28 2004-05-27 Toshiba Corp 臨界電流測定装置、臨界電流測定方法および臨界電流評価方法
JP2006329925A (ja) * 2005-05-30 2006-12-07 Toshiba Corp 超電導導体の評価方法および装置

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS50144479A (fr) * 1974-05-09 1975-11-20
JPH05312879A (ja) * 1992-05-15 1993-11-26 Sumitomo Electric Ind Ltd 極細多芯超電導線の断線検査方法および断線検査装置
JP2004150809A (ja) * 2002-10-28 2004-05-27 Toshiba Corp 臨界電流測定装置、臨界電流測定方法および臨界電流評価方法
JP2006329925A (ja) * 2005-05-30 2006-12-07 Toshiba Corp 超電導導体の評価方法および装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI745478B (zh) * 2016-11-11 2021-11-11 美商富克有限公司 用於非接觸式電壓測量裝置的傳感器子系統
US11746602B2 (en) * 2020-02-27 2023-09-05 Power Feed-Thru Systems And Connectors Llc Systems and methods for testing electrical properties of a downhole power cable
CN116793847A (zh) * 2023-08-29 2023-09-22 天津市小猫线缆股份有限公司 一种柔性矿物绝缘防火电缆线芯拉力试验设备
CN116793847B (zh) * 2023-08-29 2023-11-03 天津市小猫线缆股份有限公司 一种柔性矿物绝缘防火电缆线芯拉力试验设备

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