CN101833027B - Non-contact type superconducting tape current-carrying capacity measuring device - Google Patents
Non-contact type superconducting tape current-carrying capacity measuring device Download PDFInfo
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- CN101833027B CN101833027B CN2010101637150A CN201010163715A CN101833027B CN 101833027 B CN101833027 B CN 101833027B CN 2010101637150 A CN2010101637150 A CN 2010101637150A CN 201010163715 A CN201010163715 A CN 201010163715A CN 101833027 B CN101833027 B CN 101833027B
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Abstract
The invention belongs to the field of superconducting electrical engineering, particularly relates to a non-contact type superconducting tape current-carrying capacity measuring device. In a current transmission performance continuous measuring method based on a signal magnetic path, a detection magnetic path is vertically fixed on a base; and an iron core, a sample slit, a measuring slit and an exciting coil of the detection magnetic path form a closed detection magnetic path. Under the conditions of liquid nitrogen at low temperature, the exciting coil is electrified to generate a fixed magnetic field at the sample slit and the measuring slit; a sample passes through the sample slit to induce annular current in the sample; and magnetic induction intensity change generated when the detection magnetic path is reversely driven by the annular current is measured at the measuring slit to reflect the current-carrying capacity of the tape. The single magnetic path device has the same advantages of high speed and favorable repeatability as double magnetic paths, can also measure the current-carrying capability of the tape i different applied magnetic fields and different magnetic filed penetrativities and is especially suitable for continuously measuring the current-carrying capacity of the ultralong and superconducting tape.
Description
Technical field
The invention belongs to superconduct engineering field, particularly a kind of non-contact type superconducting tape current-carrying capacity measuring device.
Background technology
Superconductor is green, and sustainable energy economy provides the important techniques support, and hyperconductive cable, superconduction blower fan are all progressively moving towards civilian, and the age of using high temperature superconducting materia on a large scale at hand.Electric current current-carrying performance is the basic parameter of reflection superconducting tape performance.Generally take " four leads method " to measure the current-carrying performance of critical current reflection electric current, promptly at sample two ends loading current, the observation voltage signal.Along with the increase of electric current, the increase by observation voltage produces 1 microvolt as the quench criterion with every centimetre of band length, determines the critical current of superconducting tape.This method principle is simple, is widely used in the short sample measurement of other length of laboratory-scale less than 10cm.The Bi series high-temperature superconductive wire has been realized industrialization production at present, single Bi is that conductor length has surpassed 500 meters, just also realized hundred meters magnitudes in developing Y series high-temperature superconductive wire length, online detection long band overall performance and local defect are very important.As a kind of measuring method of contact, the critical current measurement that four leads method are applied in long superconducting tape has a lot of limitation.At first current feed need contact with band with voltage lead in measurement, can cause mechanical damage to superconducting tape, and secondly testing efficiency is also very low, is inconvenient to realize to the long continuously and quickly measuring of being with of hundred meter levels.
At the deficiency of four leads method for belt material of high temperature superconduct continuous coverage ability, the scientific research personnel has been developed a series of by Hall plate measurement strip surface magnetic field, the method for reflection critical current.Wherein a kind of method is that superconducting tape is placed under the external magnetic field, usually provide by the Hai Muhuoci coil, the ring current of can inducting in superconducting sample opposing externally-applied magnetic field, ring current produces certain space distribution, by place hall probe at sample surfaces certain altitude place, measurement induct ring current Distribution of Magnetic Field and amplitude, the inverse critical current.
Another method is that the superconducting tape sample is at first by a background magnetic field, usually background magnetic field need be greater than the maximum penetration field of twice, to shift out background magnetic field through the superconducting tape sample after the magnetization then, can generate the ring current of similar eddy current this moment in superconducting tape inside, because the superconductor self-resistance is very little, this ring current can exist for a long time, and produces a magnetic field, usually claim that this magnetic field is remnant field, remnant field has certain distribution in the space.Placing the detection of magnetic field element with strip surface relative position point of fixity, be generally hall probe, measure the magnetic induction density of strip surface point.When popping one's head in the sample relative position fixedly, the magnetic induction density amplitude and the band critical current that measure remnant field have the relation of direct ratio, but the critical current of inverse band correspondence.
Above-mentioned two kinds of method of testings have developed for many years, become the method for testing of standard of comparison, also have Related product to come out.But the major defect of this method is to need accurate location between band and the hall probe, because producing magnetic field, sample has certain distribution in the space, utilizing hall probe to measure only is the magnetic induction density of measuring a point or several points, be the method for a kind of " to put " in essence for face, the relative position that band and hall probe are small changes, skew about no matter being, still skew up and down all can produce very big influence to final testing result.About the sample of common hundred micron levels and probe or upper-lower position skew all can produce very mistake to measurement result, the gauger can't judge the magnetic field reading change be since band and probe relative position change cause or since the variation of the critical current of band own cause.Critical current continuous measuring device based on this principle, in order to keep the stable of hall probe and sample relative position as far as possible, the band gearing needs accurate design, and further improve the stable of sample and hall probe relative position to sacrifice transmission speed, cause efficiency of measurement low, the product measuring speed of comparative maturity is approximately 60 meters/hour at present.Nonetheless, utilize this method test band critical current, its background noise is all about several amperes.
The application for a patent for invention that the applicant submits " non-contact type superconduction belt material critical current measuring device " (application number: be a kind of 201010033688.5) based on double magnetic circuit, measure the method for critical current for the driving force of magnetic circuit by measuring the band remnant field, this method is from having eliminated mechanical vibration in essence for the influence of measuring, the speed that realized is greater than 360 meters/hour, repeatability is better than 1% measurement mechanism, has overcome above-mentioned utilization and has measured the superconducting tape surface induction intensity shortcoming of the method for inverse critical current again.This method is specially adapted to quick test band critical current.But this method only is used to check band from after the match, penetrates the critical current under the state entirely, is the reaction of band in self-fields download stream ability.Because superconducting tape electric current current capacity is very responsive for externally-applied magnetic field, the different simultaneously current capacities that penetrate under the state also are not quite similar, this method of utilizing double magnetic circuit to measure remanent magnetism can't realize band in various external magnetic fields and the various current capacity test that penetrates under the state, and the data of surveying are reflected in the current capacity information under the different operating magnetic field not enough comprehensively.
Summary of the invention
Purpose of the present invention utilizes the method for double magnetic circuit measurement remanent magnetism can't realize that band is in various external magnetic fields and the various current capacity test that penetrates under the state for solving prior art, the data of surveying are reflected in the problem of the current capacity information under the different operating magnetic field not enough comprehensively, the present invention is based on single magnetic circuit, by measuring ring current that external magnetic field inducts at superconducting tape method to the reverse drive ability reflection through-current capability of magnetic circuit, a kind of non-contact type superconducting tape current-carrying capacity measuring device is proposed, it is characterized in that, surveying magnetic circuit is vertically fixed on the pedestal 10, survey magnetic circuit and comprise iron core 1, field coil 2, sample slit 3 and measuring slit 4, the unwrapping wire equipment and the take-up equipment that are installed in first guide wheel 7 on the pedestal 10 and second guide wheel, 8 fluid,matching nitrogen cascades, 9 outsides are formed the continuous gearing of superconducting tape, first guide wheel 7 and second guide wheel 8 place respectively surveys the magnetic circuit both sides, first guide wheel 7, the sample slit 3 and second guide wheel 8 are on same straight line, the sample 6 of belt material of high temperature superconduct is sent to outside take-up equipment through second guide wheel, 8 guiding again from the unwrapping wire equipment of outside is guided through sample slit 3 through first guide wheel 7 after, sample direction of motion 11 is pointed to second guide wheel 8 from first guide wheel 7; Pedestal 10 places the bottom of liquid nitrogen container 9, and detection magnetic circuit and sample 6 all are immersed in the liquid nitrogen during device work; Field coil 2 is wrapped on the iron core 1 in the described detection magnetic circuit, and iron core 1, sample slit 3 and the measuring slit 4 of surveying magnetic circuit constitute closed magnetic circuit, and the magnet field probe 5 of measuring magnetic induction density places in the measuring slit 4.
Described iron core 1 is iron core-closed, is shaped as O type, rectangle or closed polygon.
The material of described iron core 1 is a soft magnet core.
The height h of the sample slit 3 of described detection magnetic circuit is greater than sample width w, sample slit width a
1Greater than thickness of sample t.
Described magnet field probe 5 is hall probe or giant magnetoresistance probe.
The core component of measurement mechanism of the present invention is the detection magnetic circuit that contains double aperture slit and field coil.In order to finish continuous coverage, also be furnished with continuous gearing of band and low-temperature (low temperature) vessel to long superconducting tape.
Device groundwork flow process is as follows: under the liquid nitrogen cryogenics condition, the field coil energising of surveying magnetic circuit drives magnetic circuit work, can produce a fixed magnetic field at sample slit and measuring slit place this moment, and the magnet field probe measurement that this magnetic field amplitude is placed on the measuring slit place is designated as B
0
Belt material of high temperature superconduct sample to be measured through the sample slit, can produce a ring current by actuator drives, this ring current reverse drive magnetic circuit, weaken the magnetic induction density at measuring slit place, measure the variation of magnetic induction density through magnet field probe, and then calculate the through-flow performance of this superconducting tape.For the superconducting tape with batch (strip width is all identical with thickness), the decrease of the magnetic induction density at measuring slit place is directly proportional with the through-current capability of belt material of high temperature superconduct sample.
What pay particular attention to is that the electric current that can adjust field coil in the actual measurement arbitrarily changes B
0Value, so the present invention can measure superconducting tape under different magnetic field, difference penetrates the through-current capability under the state, obtains the abundanter physical message of sample.Work as B
0Amplitude is during greater than one times of penetration field, and the sample ring current occupies whole sample, and the critical current data that obtain by the standard of comparison four-point method this moment can distribute by the long band of inverse critical current.
Survey the magnetic circuit thickness d, promptly the magnetic circuit thickness along the band transmission direction determines the spatial resolution of measurement mechanism to sample.It is more little to survey the magnetic circuit thickness d, and institute's test sample product local message reflects fully more; It is big more to survey the magnetic circuit thickness d, reflects fully more to institute's whole through-current capability of test sample product.Surveying the magnetic circuit thickness d can determine according to user's demand.
Measurement mechanism of the present invention is particularly suitable for the test of flat belt material of high temperature superconduct current capacity, and institute's test sample product can be the Bi2223/Ag belt material of high temperature superconduct, also can be the YBCO belt material of high temperature superconduct.
The present invention and be based on the non-contact type superconduction belt material critical current measuring device something in common of double magnetic circuit solves " with point for face " limitation of prior art measuring method from physical essence, has realized the measurement to the whole critical current performance of sample.Even if in the measuring process band about skew or up and down skew reach several millimeter, for the influence of measurement result less than one of percentage.Need only sample during measurement and be not moved out of the sample slit, about it or skew up and down can not change the ring current of sample, can not change to driving the magnetic circuit ability, the magnetic induction density that measures at measuring slit can not change yet, can not exert an influence to the through-current capability test result, fundamentally solve prior art and required sample and the pinpoint shortcoming of probe, made band kinematic train design complexity reduce significantly, can also increase substantially tape running speed and efficiency of measurement.Be particularly suitable for the continuous coverage of industrialization overlength band through-current capability.
The present invention and be based on the non-contact type superconduction belt material critical current measuring device difference of double magnetic circuit, the present invention can measure band at different magnetic field, difference penetrates the through-current capability under the state, usable range is more extensive, the physical message that discloses is horn of plenty more, owing to only use a magnetic circuit, the system complex degree also decreases simultaneously.Non-contact type superconduction belt material critical current measuring device based on double magnetic circuit is a kind of measurement band remnant field of device measure critical current under zero magnetic field condition by to(for) the driving force inverse of magnetic circuit.
Beneficial effect of the present invention is, this side possesses the high speed same with the double magnetic circuit device, the advantage of good reproducibility, can also measure superconducting tape under different externally-applied magnetic fields, the band current-carrying performance of different magnetic field penetrativity, for the scrutiny band provides experiment porch at the current capacity under the different magnetic field, owing to only used a magnetic circuit, the complexity of device also decreases simultaneously.
Description of drawings
Fig. 1 is a kind of non-contact type superconducting tape current-carrying capacity measuring device embodiment synoptic diagram;
Fig. 2 is for surveying the magnetic structure synoptic diagram;
Fig. 3 is to the measurement result of 2.8 meters YBCO bands and 2.5 meters Bi2223 belt material of high temperature superconduct;
Among the figure, 1--iron core, 2--field coil, 3--sample slit, 4--measuring slit, 5--magnet field probe, 6--sample, 7--first guide wheel, 8--second guide wheel, 9--low-temperature (low temperature) vessel, 10--pedestal, 11--sample direction of motion.
Embodiment
Below in conjunction with principle of work, measurement flow process and the test result of drawings and Examples detailed description based on the non-contact type superconducting tape current-carrying capacity measuring device of single Magnetic Circuit Method.
Non-contact type superconducting tape current-carrying capacity measuring device embodiment synoptic diagram is surveyed magnetic circuit and is vertically fixed on the pedestal 10 as shown in Figure 1, surveys magnetic circuit and comprises iron core 1, field coil 2, sample slit 3 and measuring slit 4.In order to realize the continuous coverage of long band, the unwrapping wire equipment and the take-up equipment that are installed in first guide wheel 7 on the pedestal 10 and second guide wheel, 8 fluid,matching nitrogen cascades, 9 outsides are formed the continuous gearing of superconducting tape, first guide wheel 7 and second guide wheel 8 place respectively surveys the magnetic circuit both sides, first guide wheel 7, the sample slit 3 and second guide wheel 8 are on same straight line, the sample 6 of belt material of high temperature superconduct is sent to outside take-up equipment through second guide wheel, 8 guiding again from the unwrapping wire equipment of outside is guided through sample slit 3 through first guide wheel 7 after, sample direction of motion 11 is pointed to second guide wheel 8 from first guide wheel 7; Pedestal 10 places the bottom of liquid nitrogen container 9, and detection magnetic circuit and sample 6 all are immersed in the liquid nitrogen during device work; Field coil 2 is wrapped on the iron core 1 in the described detection magnetic circuit, and iron core 1, sample slit 3 and the measuring slit 4 of surveying magnetic circuit constitute closed magnetic circuit, and the magnet field probe 5 of measuring magnetic induction density places in the measuring slit 4.
As shown in Figure 2, in the detection magnetic circuit of present embodiment, iron core 1 adopts an original outer diameter r
1=25mm, internal diameter r
2The closed O type permalloy iron core of=16mm, the mode with symmetria bilateralis is cracked promptly obtains sample slit 3 and measuring slit 4 in same diameter two ends cutting of iron core.Sample slit width a
1With measuring slit width a
2 Be 2 millimeters, sample slit height h is 9 millimeters, greater than sample width w.Sample slit 3 is 10 millimeters along the detection magnetic circuit thickness d of band moving direction.Magnet field probe 5 adopts hall probe.
This measurement mechanism is used for the sample test of flat belt material of high temperature superconduct.The high temperature super conductive conductor of this structure except obtaining the Bi2223 band of suitability for industrialized production, has tentatively possessed the YBCO belt material of high temperature superconduct of laboratory scale industrialization in addition.Device groundwork flow process is as follows: under the liquid nitrogen cryogenics condition, survey 2 energisings of magnetic circuit field coil and drive magnetic circuit work, can produce magnetic field at sample slit and measuring slit place this moment, and this magnetic field amplitude is placed on the hall probe at measuring slit place and measures, and is designated as B
0
Belt material of high temperature superconduct sample to be measured through the sample slit, can produce a ring current by actuator drives, this ring current reverse drive magnetic circuit, and the magnetic induction density at weakening measuring slit place, the hall probe that is changed to of magnetic induction density is measured.Magnetic induction density reduces direct ratio sample annular current driving ability, the through-current capability of ring current driving force direct ratio sample.
As Fig. 3 is the two sections testing sample YBCO belt material of high temperature superconduct choosing and the test result of Bi2223/Ag belt material of high temperature superconduct, wherein the YBCO band length is 2.8 meters, 3.5 millimeters of width, 0.1 millimeter of thickness, 2.5 meters of Bi2223 band length, 4.3 millimeters of width, 0.25 millimeter of thickness.Link to each other with copper strips between two sections samples, two sections sample head and the tail also are connected with copper strips respectively.Sample, connects data collecting card with computing machine and monitors hall probe output voltage data in real time by the sample slit with per second 10cm (360 meters/hour) speed, and inverse becomes Magnetic Field.Sample is at background magnetic field B
0Be respectively under 50 gaussian sums, 200 Gauss's conditions and record changes of magnetic field as shown in Figure 3.Ordinate is that sample drives the magnetic field variation signal that magnetic circuit produces after having deducted the background magnetic field background signal.The fluctuation of magnetic field amplitude promptly corresponding the fluctuation of current capacity on the sample length direction.Can obviously find out under different background magnetic field, the current capacity of band presents very big difference, under little magnetic field, no matter the YBCO band still is the Bi2223 band, its current capacity fluctuation is more mild, because electric current more concentrates on the periphery of band under the little magnetic field, this also demonstrates band from an aspect and is better than internal layer in the homogeneity of outermost.
Claims (5)
1. non-contact type superconducting tape current-carrying capacity measuring device, it is characterized in that, surveying magnetic circuit is vertically fixed on the pedestal (10), survey magnetic circuit and comprise iron core (1), field coil (2), sample slit (3) and measuring slit (4), first guide wheel (7) and outside unwrapping wire equipment and the take-up equipment of second guide wheel (8) fluid,matching nitrogen cascade (9) that are installed on the pedestal (10) are formed the continuous gearing of superconducting tape, first guide wheel (7) and second guide wheel (8) place respectively surveys the magnetic circuit both sides, first guide wheel (7), sample slit (3) and second guide wheel (8) are on same straight line, the sample of belt material of high temperature superconduct (6) is sent to outside take-up equipment through second guide wheel (8) guiding again from the unwrapping wire equipment of outside is guided through sample slit (3) through first guide wheel (7) after, sample direction of motion (11) is pointed to second guide wheel (8) from first guide wheel (7); Pedestal (10) places the bottom of liquid nitrogen container (9), and detection magnetic circuit and sample (6) all are immersed in the liquid nitrogen during device work; Field coil (2) is wrapped on the iron core (1) in the described detection magnetic circuit, and iron core (1), sample slit (3) and the measuring slit (4) of surveying magnetic circuit constitute closed magnetic circuit, and the magnet field probe (5) of measuring magnetic induction density places in the measuring slit (4).
2. a kind of non-contact type superconducting tape current-carrying capacity measuring device according to claim 1, it is characterized in that, described iron core (1) is opened sample slit (3) and measuring slit (4) respectively for iron core-closed both sides, iron core-closed O type, rectangle or the polygon of being shaped as of iron core (1).
3. a kind of non-contact type superconducting tape current-carrying capacity measuring device according to claim 1 and 2 is characterized in that, the material of described iron core (1) is a soft magnet core.
4. a kind of non-contact type superconducting tape current-carrying capacity measuring device according to claim 1 is characterized in that, the height h of the sample slit (3) of described detection magnetic circuit is greater than sample width w, sample slit width a
1Greater than thickness of sample t.
5. a kind of non-contact type superconducting tape current-carrying capacity measuring device according to claim 1 is characterized in that, described magnet field probe (5) is hall probe or giant magnetoresistance probe.
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| CN2010101637150A CN101833027B (en) | 2010-04-29 | 2010-04-29 | Non-contact type superconducting tape current-carrying capacity measuring device |
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| CN2010101637150A CN101833027B (en) | 2010-04-29 | 2010-04-29 | Non-contact type superconducting tape current-carrying capacity measuring device |
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| CN101833027B true CN101833027B (en) | 2011-11-09 |
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| CN104820141B (en) * | 2015-03-10 | 2017-08-29 | 北京原力辰超导技术有限公司 | A kind of superconducting tape current carrying capacities measuring probe, measurement apparatus and method |
| CN105301093B (en) * | 2015-10-21 | 2019-01-22 | 北京原力辰超导技术有限公司 | A kind of superconducting coil defective locations detection system |
| CN105866238B (en) * | 2016-05-20 | 2023-06-09 | 云南电网有限责任公司电力科学研究院 | High-temperature superconducting tape detection system |
| CN107887074B (en) * | 2016-09-30 | 2020-07-24 | 中国电力科学研究院 | Rotary contact type high-current-carrying current lead device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034527A (en) * | 1997-04-24 | 2000-03-07 | Forschungszentrum Karlsruhe Gmbh | Method and measuring apparatus for a contactless longitudinal and transversal homogeneity examination of critical current density in superconductor tape |
| US6841988B1 (en) * | 1998-07-16 | 2005-01-11 | American Superconductor Corporation | Method for the determination of the critical current for a conductor including superconducting material, and an apparatus for performing the method |
| CN1580803A (en) * | 2003-08-06 | 2005-02-16 | 中国科学院电工研究所 | Method for measuring critical current homogenity of every portion for super conducting strip |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034527A (en) * | 1997-04-24 | 2000-03-07 | Forschungszentrum Karlsruhe Gmbh | Method and measuring apparatus for a contactless longitudinal and transversal homogeneity examination of critical current density in superconductor tape |
| US6841988B1 (en) * | 1998-07-16 | 2005-01-11 | American Superconductor Corporation | Method for the determination of the critical current for a conductor including superconducting material, and an apparatus for performing the method |
| CN1580803A (en) * | 2003-08-06 | 2005-02-16 | 中国科学院电工研究所 | Method for measuring critical current homogenity of every portion for super conducting strip |
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