CN106546838B - Device and method for measuring critical current characteristics of high-temperature superconducting strip - Google Patents
Device and method for measuring critical current characteristics of high-temperature superconducting strip Download PDFInfo
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- CN106546838B CN106546838B CN201610841534.6A CN201610841534A CN106546838B CN 106546838 B CN106546838 B CN 106546838B CN 201610841534 A CN201610841534 A CN 201610841534A CN 106546838 B CN106546838 B CN 106546838B
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
A measuring device and method for critical current characteristics of high temperature superconductive strip material is characterized in that: a rotary rod is inserted into a hole in the middle of the transverse plate and is positioned between the two background magnetic field magnets; the upper end of the rotating rod is connected with a motor shaft above the bracket; the lower end of the rotating rod is connected with the upper belt material clamp; a horizontal lower transverse plate is fixed at the middle lower part of the side wall at one side of the bracket, a rotary cylinder is embedded in a mounting hole of the lower transverse plate in a clearance way, and the lower end of the rotary cylinder is connected with a lower belt material clamp; the vertical inner cavity of the rotary cylinder is positioned right below the rotary rod; the lower transverse plate is provided with a locking screw with the inner end contacted with the rotary cylinder. The device can conveniently measure the critical current of the high-temperature superconducting tape under different magnetic field direction changes and different distortion strain modes, obtain the influence of the magnetic field direction changes and the distortion strain on the critical current of the high-temperature superconducting tape, and provide more reliable experimental basis for the design and the application of the high-temperature superconducting device with multiple tape material lap windings.
Description
Technical field:
the invention relates to a measuring device for critical current characteristics of a high-temperature superconductive strip.
The background technology is as follows:
superconductivity and its use have been one of the most active leading-edge fields of research in modern scientific technology since 1911 superconductivity was found. Since superconductivity exhibits many singular properties, zero resistance at limited temperatures, complete diamagnetism, and the like. Based on these peculiar properties, superconduction can have many applications in energy, medical, transportation, national defense, and major scientific engineering, etc. However, superconductivity is limited by its extremely low critical temperature, and has not been widely used at first, but since the discovery of high-temperature superconducting materials in 1986, the improvement of the critical temperature of superconductors to a liquid nitrogen temperature region has led to the tracking development of many countries in the world, and the application fields such as superconducting motors, superconducting current limiters, superconducting magnetic energy storage, superconducting transformers and the like are becoming more and more widespread.
High temperature superconducting materials are the core of superconducting products, while tapes are the main application form of high temperature superconducting materials. Among the overall properties of superconducting tapes, critical current characteristics are one of the most important. The critical current is the maximum current that the superconducting tape maintains in a superconducting state at a certain temperature and magnetic field. And if the critical current value is exceeded, the superconducting tape is converted from a superconducting state to a normal state. Many factors influencing the critical current characteristics of the superconducting tape are included, such as the magnitude of the background magnetic field, the direction of the magnetic field, and the strain mode.
In the development process of the superconducting device, the superconducting strip is in a changed magnetic field, and different magnetic field directions have great influence on the critical current of the superconducting strip, namely the anisotropy of the superconducting strip, so that the research of the anisotropy of the superconducting strip is of great significance. To address high current applications requiring over critical current in large magnet applications, multiple strips may be lapped to achieve high density current transmission. However, the ribbon lap winding requires twisting the ribbon, which on the one hand can change the relative angle of the ribbon and the magnetic field to produce anisotropy; on the other hand, the critical current of the strip material is also attenuated under torsional strain. Therefore, the critical current characteristics of the strip under the torsion state are tested, and the method has important significance.
The invention comprises the following steps:
the first object of the present invention is to provide a device for measuring critical current characteristics of a high-temperature superconducting tape, which can conveniently measure critical current of the high-temperature superconducting tape under different magnetic field direction changes and different twisting strain modes, obtain influence of the magnetic field direction changes and the twisting strain on the critical current of the high-temperature superconducting tape, and provide more reliable experimental basis for design and application of the high-temperature superconducting device with multi-tape lap winding.
The invention realizes the technical proposal adopted by the first purpose that the measuring device of the critical current characteristic of the high-temperature superconductive strip comprises a low-temperature Dewar (1), an H-shaped bracket is arranged in the low-temperature Dewar (1), and two background magnetic field magnets are fixed on the bottom surface of a transverse plate of the bracket, and is characterized in that:
a rotary rod is inserted into a hole in the middle of the transverse plate and is positioned between the two background magnetic field magnets; the upper end of the rotating rod is connected with a motor shaft above the bracket; the lower end of the rotating rod is connected with the upper belt material clamp;
a horizontal lower transverse plate is fixed at the middle lower part of the side wall at one side of the bracket, a rotary cylinder is embedded in a mounting hole of the lower transverse plate in a clearance way, and the lower end of the rotary cylinder is connected with a lower belt material clamp; the vertical inner cavity of the rotary cylinder is positioned right below the rotary rod; the lower transverse plate is provided with a locking screw with the inner end contacted with the rotary cylinder.
The second object of the present invention is to provide a method for measuring critical current of high temperature superconductive tape using the above device, which can conveniently and rapidly measure critical current of superconductive tape under different magnetic field direction changes and different twisting strain modes.
The technical scheme adopted by the invention for realizing the second purpose is that the method for measuring the critical current characteristics of the high-temperature superconducting tape by using the measuring device for the critical current characteristics of the high-temperature superconducting tape comprises the following steps:
A. clamping the upper end of the high-temperature superconducting tape to be tested on a tape upper clamp, and enabling the lower end to pass through the rotary drum and be clamped on a tape lower clamp; rotating the locking screw to make the inner end of the locking screw prop against the rotary drum so as to lock the lower ends of the rotary drum and the high-temperature superconductive tape; then, respectively connecting two leads of the nano-voltmeter with the upper part and the lower part of the high-temperature superconducting tape, and respectively electrically connecting the two leads of the constant current source with the upper tape clamp and the lower tape clamp;
B. introducing liquid nitrogen into the low-temperature Dewar to submerge the liquid nitrogen to the transverse plate, starting the motor to enable the rotary rod to rotate by a set rotation angle, and enabling the rotary cylinder not to rotate, so that the superconducting tape is twisted by the set rotation angle; starting a constant current source to introduce gradually increased constant current to the high-temperature superconducting tape, and synchronously recording the voltage measured by the nanovoltmeter, wherein when the voltage suddenly increases, the corresponding constant current is the critical current of the high-temperature superconducting tape under a set torsion angle;
C. and (3) changing the set rotation angle and/or changing different background magnetic field magnets, and then repeating the operation of the step B to obtain the critical current of the superconductive tape under different torsion angles and/or different background magnetic fields.
The technical scheme adopted by the invention for realizing the third purpose is that the method for measuring the critical current characteristics of the high-temperature superconductive tape by using the measuring device for the critical current characteristics of the high-temperature superconductive tape comprises the following steps:
A. clamping the high-temperature superconductive strip to be tested and the upper end of the epoxy sheet with the same length on the upper strip clamp, and enabling the lower end to pass through the rotary drum and be clamped on the lower strip clamp; then, respectively connecting two leads of the nano-voltmeter with the upper part and the lower part of the high-temperature superconducting tape, and respectively electrically connecting the two leads of the constant current source with the upper tape clamp and the lower tape clamp;
B. introducing liquid nitrogen into the low-temperature Dewar to submerge the liquid nitrogen to the transverse plate, and starting the motor to rotate the rotary rod and the rotary cylinder by a set rotation angle; the high-temperature superconducting tape rotates by a set angle along with the whole non-twist; starting a constant current source to introduce gradually increased constant current to the high-temperature superconducting tape, and synchronously recording the voltage measured by the nanovoltmeter, wherein when the voltage is suddenly increased, the corresponding constant current is the critical current of the high-temperature superconducting tape at a set rotation angle without distortion strain;
C. changing the set rotation angle and/or changing different background magnetic field magnets, and repeating the operation of the step B to obtain the critical current of the superconductive tape at different rotation angles and/or different background magnetic fields without torsion strain.
Compared with the prior art, the invention has the beneficial effects that:
1. the rotation of the rotary rod is controlled by the rotation of the motor, and the rotary cylinder rotates (the first method) or does not rotate (the second method), so that the superconducting tape generates set angle rotation under the condition of torsion strain (the first method) or no torsion strain (the second method). Therefore, the influence of the change of the magnetic field direction on the critical current characteristic of the high-temperature superconductive strip (the anisotropy of the high-temperature superconductive strip) can be accurately measured. And the anisotropy of the high-temperature superconductive tape under the condition of torsional strain can be measured. Successfully solves the problem of measuring critical current characteristics of the high-temperature superconductive strips under the condition that the strips are twisted and strained when a large current is applied. Provides more reliable experimental basis for the design and application of high-temperature superconducting devices, in particular to the design and application of high-current high-temperature superconducting devices with a plurality of high-temperature superconducting strips wound in a lap mode.
2. The magnet can be replaced, so that different background magnetic fields can be changed. The critical current characteristics of the high-temperature superconductive tape under different background magnetic fields and different torsion angles or rotation angles can be conveniently measured.
3. The motor can control the rotating rod and the belt material to rotate at any angle, so that the continuity of the torsion angle under the torsion strain condition can be ensured, and continuous measurement can be performed to ensure the accuracy and reliability of experimental results.
The invention will be further described with reference to the drawings and detailed description
Description of the drawings:
fig. 1 is a schematic structural view of a measuring device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the electrical principle of the measuring device according to the embodiment of the present invention.
The specific embodiment is as follows:
fig. 1-2 show that in a specific embodiment of the invention, a measuring device for critical current characteristics of a high temperature superconductive tape comprises a low temperature dewar 1, an H-shaped bracket 2 is arranged in the low temperature dewar 1, two background magnetic field magnets 6 are fixed on the bottom surface of a transverse plate 15 of the bracket 2, and the measuring device is characterized in that:
a rotating rod 3 is inserted into a hole in the middle of the transverse plate 15, and the rotating rod 3 is positioned between the two background magnetic field magnets 6; the upper end of the rotating rod 3 is connected with a motor 5 above the bracket 2 through a shaft; the lower end of the rotating rod 3 is connected with the upper belt material clamp 4;
a horizontal lower transverse plate 14 is fixed at the middle lower part of the side wall at one side of the bracket 2, a rotary cylinder 8 is embedded in an installation hole of the lower transverse plate 14 in a clearance way, and the lower end of the rotary cylinder 8 is connected with a lower belt material clamp 9; the vertical inner cavity of the rotary cylinder 8 is positioned right below the rotary rod 3; the lower cross plate 14 is provided with a locking screw 10 whose inner end is in contact with the rotary cylinder 8.
The first method for measuring the critical current characteristics of the high-temperature superconductive tape by using the measuring device for the critical current characteristics of the high-temperature superconductive tape comprises the following steps:
A. clamping the upper end of a high-temperature superconducting tape 7 to be tested on the upper tape clamp 4, and passing through the rotary drum 8 and clamping the lower end of the high-temperature superconducting tape on the lower tape clamp 9; rotating the locking screw 10 to make the inner end of the locking screw tightly prop against the rotary drum 8 so as to lock the lower ends of the rotary drum 8 and the superconductive tape 7; two leads of the nano-voltmeter 12 are respectively connected to the upper part and the lower part of the high-temperature superconducting tape 7, and two leads of the constant current source 13 are respectively electrically connected with the upper tape clamp 4 and the lower tape clamp 9;
B. introducing liquid nitrogen into the low-temperature Dewar 1 to submerge the liquid nitrogen to the transverse plate 15, starting the motor 5 to enable the rotary rod 3 to rotate by a set rotation angle, and enabling the rotary cylinder 8 not to rotate, so that the superconducting tape 7 is twisted along with the rotary rod to rotate by the set rotation angle; starting a constant current source 13 to introduce gradually increased constant current to the high-temperature superconducting tape 7, and synchronously recording the voltage measured by the nano-voltmeter 12, wherein when the voltage suddenly increases, the corresponding constant current is the critical current of the high-temperature superconducting tape under the set torsion angle;
C. and (3) changing the set rotation angle and/or changing different background magnetic field magnets 6, and then repeating the operation of the step B to obtain the critical current of the superconductive tape under different torsion angles and/or different background magnetic fields.
The second method for measuring the critical current characteristics of the high-temperature superconductive tape by using the measuring device for the critical current characteristics of the high-temperature superconductive tape comprises the following steps:
A. clamping the high-temperature superconductive strip 7 to be tested and the upper end of an epoxy sheet 11 with the same length on the upper strip clamp 4, and enabling the lower end to pass through the rotary drum 8 and be clamped on the lower strip clamp 9; two leads of the nano-voltmeter 12 are respectively connected to the upper part and the lower part of the high-temperature superconducting tape 7, and two leads of the constant current source 13 are respectively electrically connected with the upper tape clamp 4 and the lower tape clamp 9;
B. introducing liquid nitrogen into the low-temperature Dewar 1 to submerge the liquid nitrogen to the transverse plate 15, and starting the motor 5 to rotate the rotary rod 3 and the rotary cylinder 8 by a set rotation angle; the high-temperature superconducting tape 7 rotates by a set angle along with the whole non-twist; starting a constant current source 13 to introduce gradually increased constant current into the high-temperature superconducting tape, and synchronously recording the voltage measured by the nano-voltmeter 12, wherein when the voltage suddenly increases, the corresponding constant current is the critical current of the high-temperature superconducting tape at a set rotation angle without torsion strain;
C. and (3) changing the set rotation angle and/or changing different background magnetic field magnets 6, and then repeating the operation of the step B to obtain the critical current of the superconductive tape at different rotation angles and/or different background magnetic fields without torsion strain.
Claims (1)
1. The measuring device comprises a low-temperature Dewar (1), an H-shaped support (2) is arranged in the low-temperature Dewar (1), and two background magnetic field magnets (6) are fixed on the bottom surface of a transverse plate (15) of the support (2), and the measuring device is characterized in that:
a rotating rod (3) is inserted into a hole in the middle of the transverse plate (15), and the rotating rod (3) is positioned between the two background magnetic field magnets (6); the upper end of the rotary rod (3) is connected with a motor (5) shaft above the bracket (2); the lower end of the rotating rod (3) is connected with the upper belt material clamp (4);
a horizontal lower transverse plate (14) is fixed at the middle lower part of the side wall at one side of the bracket (2), a rotary cylinder (8) is embedded in a mounting hole of the lower transverse plate (14) in a clearance way, and the lower end of the rotary cylinder (8) is connected with a lower belt material clamp (9); the vertical inner cavity of the rotary cylinder (8) is positioned right below the rotary rod (3); the lower transverse plate (14) is provided with a locking screw (10) with the inner end contacted with the rotary cylinder (8);
the method for measuring critical current of the superconductive tape under different torsion angles and/or different background magnetic fields comprises the following steps:
A. clamping the upper end of a high-temperature superconducting tape (7) to be tested on a tape upper clamp (4), and enabling the lower end to pass through a rotary drum (8) and be clamped on a tape lower clamp (9); rotating the locking screw (10) to enable the inner end of the locking screw to abut against the rotary drum (8) so as to lock the lower ends of the rotary drum (8) and the superconducting tape (7); two leads of the nano-voltmeter (12) are respectively connected to the upper part and the lower part of the high-temperature superconducting tape (7), and two leads of the constant current source (13) are respectively electrically connected with the upper tape clamp (4) and the lower tape clamp (9);
B. introducing liquid nitrogen into the low-temperature Dewar (1) to submerge the liquid nitrogen to the transverse plate (15), starting the motor (5) to enable the rotary rod (3) to rotate by a set rotation angle, and enabling the rotary cylinder (8) not to rotate, so that the superconducting tape (7) is twisted by the set rotation angle; starting a constant current source (13) to introduce gradually increased constant current to the high-temperature superconducting tape (7), and synchronously recording the voltage measured by the nano-volt meter (12), wherein when the voltage suddenly increases, the corresponding constant current is the critical current of the high-temperature superconducting tape under a set torsion angle;
C. changing the set rotation angle and/or changing different background magnetic field magnets (6), and then repeating the operation of the step B to obtain the critical current of the superconductive tape under different torsion angles and/or different background magnetic fields;
the method for measuring critical current of the superconductive tape under different rotation angles and/or different background magnetic fields without torsion strain comprises the following steps:
A. clamping the upper ends of the high-temperature superconductive strip (7) to be tested and the epoxy sheet (11) with the same length on the upper strip clamp (4), and the lower ends of the high-temperature superconductive strip pass through the rotary drum (8) together and are clamped on the lower strip clamp (9); two leads of the nano-voltmeter (12) are respectively connected to the upper part and the lower part of the high-temperature superconducting tape (7), and two leads of the constant current source (13) are respectively electrically connected with the upper tape clamp (4) and the lower tape clamp (9);
B. introducing liquid nitrogen into the low-temperature Dewar (1) to submerge the liquid nitrogen to the transverse plate (15), and starting the motor (5) to rotate the rotary rod (3) and the rotary cylinder (8) by a set rotation angle; the whole superconducting tape (7) is rotated by a set angle without twisting; starting a constant current source (13) to introduce gradually increased constant current into the high-temperature superconducting tape, and synchronously recording the voltage measured by the nano-volt meter (12), wherein when the voltage suddenly increases, the corresponding constant current is the critical current of the high-temperature superconducting tape under the set rotation angle without distortion strain;
C. and (3) changing the set rotation angle and/or changing different background magnetic field magnets (6), and then repeating the operation of the step B to obtain the critical current of the superconductive tape at different rotation angles and/or different background magnetic fields without torsion strain.
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| CN201610841534.6A CN106546838B (en) | 2016-09-22 | 2016-09-22 | Device and method for measuring critical current characteristics of high-temperature superconducting strip |
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| CN106546838B true CN106546838B (en) | 2023-09-01 |
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