CN104952549A - Variable-temperature critical current test sample holder for high-temperature superconducting wires and superconducting tapes - Google Patents
Variable-temperature critical current test sample holder for high-temperature superconducting wires and superconducting tapes Download PDFInfo
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- CN104952549A CN104952549A CN201510242764.6A CN201510242764A CN104952549A CN 104952549 A CN104952549 A CN 104952549A CN 201510242764 A CN201510242764 A CN 201510242764A CN 104952549 A CN104952549 A CN 104952549A
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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
The invention discloses a variable-temperature critical current test sample holder for high-temperature superconducting wires and superconducting tapes. The variable-temperature critical current test sample holder comprises an epoxy base and two current leads. An epoxy jacket sleeves the two current leads, a sealing flange is mounted at an end of the epoxy jacket, bakelite support rings are respectively arranged in the inner walls of two ends of the epoxy jacket, spaces between the inner walls of the two ends of the epoxy jacket and spaces between the outer walls of the two current leads are filled with low-temperature epoxy glue, and the two current leads extend out of the epoxy jacket; a stainless steel U-shaped support is fixed to the middle of the epoxy base, a downward opening is formed in the stainless steel U-shaped support, two stainless steel hangers are fixed to one side of the epoxy base, two composite current leads are fixed to the other side of the epoxy base, two current lead connecting blocks are respectively fixed to the tops of the two stainless steel hangers, and the two current leads are connected with each composite current lead by the corresponding current lead connecting block. The variable-temperature critical current test sample holder has the advantages that the variable-temperature critical current test sample holder is applicable to performance testing experiments on the superconducting braided wires/tapes at different temperatures and can be in reliable contact with the superconducting braided wires/tapes at low temperatures; high currents can be supplied to the variable-temperature critical current test sample holder, and the variable-temperature critical current test sample holder is easy to operate when samples need to be changed.
Description
Technical field
The present invention relates generally to large scale superconducting magnet field, particularly relate to a kind of high temperature superconductive wire-superconductive tape temperature-changeable critical current test specimen holder, for the straight short sample of hts tape/superconducting tape in different temperatures, the critical current test under different size background magnetic field.
Background technology
Large scale superconducting magnet is the key of full superconduction controllable magnetic constraint fusion reactor, and its major function constrains in magnetic condenser by ultra-high temperature plasma, realizes controlled nuclear fusion reaction.In ITER design, magnet all adopts NbTi and Nb3Sn low temperature superconducting material.The research of experimental reactor is shown that device is larger, magnetic field is higher, more easily realize controlled fusion reaction and generating, following demonstration reactor and commercial stack operation parameter (power >2GW, magnetic field >15T, electric current >100kA, carrying >150 ton/rice) far above current ITER design parameter.By the restriction of low-temperature superconducting wire upper critical field, adopt Conventional cryogenic superconductor can not prepare magnet more than 22T, the magnet of coiling more highfield requires that material still can keep comparatively high critical current densities in more than the magnetic field of 20T.Therefore, superconductor and the high field magnet of seeking to have more excellent comprehensive performance are that following controllable magnetic retrains the problem that must solve in HCSB-DEMO and commercialization process.Ceramic oxide high temperature superconducting materia has high irreversibility field and excellent magnetic field current-carring characteristic because of it under 4.2K, is therefore the ideal material building high field magnet.In high temperature superconducting materia, Bi2Sr2Ca1Cu2OX (Bi-2212) is the material that uniquely can be prepared into isotropism circle line, even if it still can the engineering current density that has significant practical applications of carrying tool up to 45T in 4.2K outfield, is therefore the high temperature superconducting materia of (>20T) application prospect under current most High-Field.And with the belt material of high temperature superconduct that Bi-2223 and YBCO is representative, with its high-critical temperature (Tc), upper critical magnetic field, good mechanical property, is widely applied at high-temperature superconductive lead wire and HTS-SMES magnet field.
Detailed research to be carried out to its performance before use hts tape/band, comprise the mechanical property under normal temperature and low temperature, critical performance under different temperature fields and magnetic field, Electromagnetism Characteristics and the impact etc. of strain on its superconductivity, because practical conductor is operated in comparatively complicated high ambient field.Therefore, research background magnetic field intensity and angle can provide important data for Future Design cable and conductor to the impact of superconducting line critical current.
Superconducting line/be with critical performance test experiments to adopt four leads method to test.
Experiment content comprises: in different background magnetic field, the critical current test of superconducting wires/strips at 4.2K-30K temperature.
Test period, specimen holder is immersed in liquid helium, and realizes variations in temperature by heating resistor evaporation liquid helium.Therefore need to design a set of reliable system, realize the fixing of sample, temperature controlled, and in background magnetic field, pass into galvanic current stream to sample, the critical current of test sample in different background magnetic field and different temperature fields.
At present, domestic and international low temperature test room devises multiple temperature-changeable specimen holder for studying the relation of the critical performance of superconducting line and temperature, configurations, but in order to control temperature accurately and reliably and the critical performance measuring superconducting line, must consider during specimen holder design following some:
What 1, sample can be stable is fixed on testing apparatus;
2, in low temperature environment, the Contact of superconducting line sample and current feed is good, and current delivery is stablized;
3, the stability contorting of alternating temperature indoor temperature;
4, the current feed in temperature-changing chamber will be superconductive current lead, avoids common current lead-in wire to produce Joule heat when current-carrying, affects temperature and control;
When 5, putting into specimen holder, current feed is easy to cooling to save liquid helium;
6, specimen holder lower end, particularly alternating temperature module section will be easy to dismounting, to change sample.
7, heat is leaked in maximum reduction, saves liquid helium;
Reliable electric insulation.
Summary of the invention
The present invention proposes a kind of high temperature superconductive wire-superconductive tape temperature-changeable critical current test specimen holder, is a kind of superconducting line critical performance test specimens product of can testing at different temperatures bar rational in infrastructure.
The present invention adopts technical scheme to be:
A kind of high temperature superconductive wire-superconductive tape temperature-changeable critical current test specimen holder, it is characterized in that: include epoxy base, two current feeds, epoxy sheath is arranged with outside two current feeds, one end of epoxy sheath is provided with sealing flange, bakelite support ring is respectively equipped with in the two ends inwall of epoxy sheath, be filled with Low-temperature epoxy glue between the outer wall of the two ends inwall of epoxy sheath and two current feeds, two current feeds all stretch out outside epoxy sheath; The middle part of epoxy base is fixed with a U-shaped support of downward opening stainless steel, side is fixed with two stainless steel suspension rods, opposite side is fixed with two recombination current lead-in wires, the top of two stainless steel suspension rods is fixed with a current feed contiguous block respectively, and two current feeds to go between with recombination current respectively by a current feed contiguous block and are connected.
Described current feed is oxygen-free copper current feed, and recombination current lead-in wire is by oxygen-free copper and Nb
3sn superconducting line forms.
operation principle of the present invention is:
Tested short sample is fixed in the U-shaped stainless steel supporting construction of specimen holder lower end.Be placed on the neutralization of liquid helium groove to be parallel in the axis magnetic field (solenoid) of specimen holder.The selection of the sense of current will make the Ampere force suffered by the short sample of superconducting line be directed to U-shaped stainless steel support side, in order to avoid short sample is subject to excessive Lorentz force and produces larger deformation, or comes off from specimen holder, falls in magnet.Owing to adopting 4 leads method test critical currents, on short sample, voltage signal, therefore Chang Du Yao≤40mm of the short sample of superconducting line must be gathered by the equipotential line of weld interval 20-40mm.Alternating temperature principle is that heating resistor produces heat, and the liquid helium in evaporation alternating temperature cylinder, makes the temperature in alternating temperature cylinder change, and temperature controls to be completed by temperature controller, and temperature-controlled precision is ± 0.1K.
The resolution of magnetic field measurement system is better than 20mT, and its absolute accuracy is better than 1%.The resolution of testing current must be better than 0.1A, and absolute accuracy is better than 0.5%.
Testing apparatus comprises the magnet system providing ambient field, specimen holder, low-temperature (low temperature) vessel, power-supply device and data acquisition system etc.
There is provided the magnet of ambient field to be spiral cast superconduction hybrid magnet, inside and outside coil is respectively by Nb3Sn and NbTi wire-wound system.Aperture is 70mm, and its central magnetic field reaches as high as 16T, center diameter, is highly uniformity of magnetic field in the cylinder of 10mm up to 2.3 × 10
-4.
Magnet is in parallel-individual superconducting switch simultaneously, and during stable magnetic field, magnet is in operation with closed ring pattern, and is immersed in liquid helium, and during to ensure to test, magnet system is more stable.
the invention has the beneficial effects as follows:
The present invention plays an important role in the relation between the critical current and temperature of research Bi2212, Bi2223 and MgB2 superconducting line; Epoxy sheath provides helium circuit, and cooling current feed, saves a large amount of liquid helium, and epoxy sheath supporting construction is easy to dry, and the time changing sample is shortened greatly, and the phenomenon of freezing after specimen holder sweating water puts into liquid helium Dewar can not occur; In critical current test process, at temperature stabilization after target temperature, temperature fluctuation is less than ± 0.2K, and the superconductive current lead transmission current in temperature-controlling chamber is stablized, and does not substantially produce Joule heat; In addition, during in order to reduce to test, voltage background signal, have employed equipotential line without vacuum plug, directly draws the method for access collecting device, effectively reduces the impact of background signal on certainty of measurement, improve measuring accuracy.
Advantage of the present invention is:
The present invention is applicable to Superconducting Strand under different temperatures/band performance test experiment, and its sample skeleton clamping structure is novel in design, domesticly at present there is no similar structures, and this structure is reliable contacts at low temperatures, and can pass into big current, operates simple and easy when changing sample.
Accompanying drawing explanation
Fig. 1 is perspective view of the present invention.
Fig. 2 is front cross-section view of the present invention.
Fig. 3 is vertical view cutaway drawing of the present invention.
Fig. 4 is the sectional perspective schematic diagram of Fig. 3.
Fig. 5 is the schematic perspective view after Tu3Jia temperature-controlling chamber passport.
Embodiment
As Figure 1-5, a kind of high temperature superconductive wire-superconductive tape temperature-changeable critical current test specimen holder, include epoxy base B6, two current feed A4, epoxy sheath A3 is arranged with outside two current feed A4, one end of epoxy sheath A3 is provided with sealing flange A2, bakelite support ring A5 is respectively equipped with in the two ends inwall of epoxy sheath A3, be filled with Low-temperature epoxy glue A1 between the two ends inwall of epoxy sheath A3 and the outer wall of two current feed A4, two current feed A4 all stretch out outside epoxy sheath A3; The middle part of epoxy base B6 is fixed with a downward opening stainless steel U-shaped support B4, side is fixed with two stainless steel suspension rod B2, opposite side is fixed with two recombination current lead-in wire B3, the top of two stainless steel suspension rod B2 is fixed with a current feed contiguous block B1 respectively, and two current feed A4 are connected respectively by a current feed contiguous block B1 and the recombination current B3 that goes between.
Current feed A4 is oxygen-free copper current feed, and recombination current lead-in wire B3 is by oxygen-free copper and Nb
3sn superconducting line forms.
structure illustrates:
Components A 1 is Low-temperature epoxy glue, prevents the helium gasified from leaking along current feed, also has good insulation and sealing function at low temperatures;
Components A 2 is sealing flange, is connected during experiment with magnet Dewar;
Components A 3 is epoxy sheath, and protective current lead-in wire, plays a supporting role simultaneously on the one hand, in addition for the cold helium of evaporation provides return gas channel, puts into specimen holder and laboratory cooling current feed, saves liquid helium;
Components A 4 is the oxygen-free copper current feed be connected with sample, and current feed cross section is through optimal design, and through-current capability reaches 1000A;
Components A 5 is bakelite support ring, is specimen holder support component;
Part B 3 is copper+Nb
3the recombination current lead-in wire of Sn, compare simple copper current lead-in wire, recombination current lead-in wire can reduce the Joule heat that resistance produces, and reduces liquid helium evaporation;
Part B 1 is current feed contiguous block, for connecting B3 and A4 parts;
Part B 2 is stainless steel suspension rod, for fixing lower end test module;
Part B 4 is the U-shaped support of stainless steel, and test sample is placed in effect, and plays the effect of offsetting the Lorentz force that sample energising produces, in addition for the layout of heating resistor and thermometer provides platform;
Part B 5 is the Bi2223 high-temperature superconductive lead wire in temperature-controlling chamber, for the current delivery in temperature-controlling chamber, it is feed back to heating resistor power source temperature signal by thermometer that temperature control indoor temperature controls, the automatic regulation output power of power supply, due to higher to the required precision of temperature control, if there is the thermal source except heating resistor in temperature-controlling chamber, temperature-controlled precision can be affected.Therefore, the current delivery in temperature-controlling chamber adopts high-temperature superconductive lead wire, and transmission current in temperature-controlling chamber can be avoided to produce Joule heat.
Part B 6 is epoxy base, for the fixing structure such as U-shaped support and recombination current lead-in wire;
Part B 7 is temperature-controlling chamber's guard shield, act as heat insulation, provides a temperature-changeable region near tested person sample.
Claims (2)
1. high temperature superconductive wire-superconductive tape temperature-changeable critical current test specimen holder, it is characterized in that: include epoxy base, two current feeds, epoxy sheath is arranged with outside two current feeds, one end of epoxy sheath is provided with sealing flange, bakelite support ring is respectively equipped with in the two ends inwall of epoxy sheath, be filled with Low-temperature epoxy glue between the outer wall of the two ends inwall of epoxy sheath and two current feeds, two current feeds all stretch out outside epoxy sheath; The middle part of epoxy base is fixed with a U-shaped support of downward opening stainless steel, side is fixed with two stainless steel suspension rods, opposite side is fixed with two recombination current lead-in wires, the top of two stainless steel suspension rods is fixed with a current feed contiguous block respectively, and two current feeds to go between with recombination current respectively by a current feed contiguous block and are connected.
2. high temperature superconductive wire according to claim 1-superconductive tape temperature-changeable critical current test specimen holder, it is characterized in that: described current feed is oxygen-free copper current feed, recombination current lead-in wire is by oxygen-free copper and Nb
3sn superconducting line forms.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370952A (en) * | 2016-09-23 | 2017-02-01 | 西南交通大学 | Measuring device for measuring critical current characteristics of high-temperature superconducting coil under magnetic disturbance and method of measuring device |
| CN106872733A (en) * | 2017-01-16 | 2017-06-20 | 中国科学院合肥物质科学研究院 | 2kA superconductive strand critical current test sample holders |
| CN108106935A (en) * | 2017-11-24 | 2018-06-01 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of superconducting line axial strain |
| CN108398337A (en) * | 2018-03-12 | 2018-08-14 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of Superconducting Strand partial lateral compression strain |
| CN108573789A (en) * | 2018-06-29 | 2018-09-25 | 宁波健信核磁技术有限公司 | A kind of fixing device of high-temperature superconductive lead wire |
| CN108680770A (en) * | 2018-04-03 | 2018-10-19 | 中国科学院合肥物质科学研究院 | A kind of universal low noise electrical measurement specimen holder |
| CN109100582A (en) * | 2017-06-20 | 2018-12-28 | 中国电力科学研究院 | A kind of short straight basic test skeleton of sample of high-temperature superconductor band |
| CN109215931A (en) * | 2018-09-19 | 2019-01-15 | 中国科学院合肥物质科学研究院 | A kind of low-temperature superconducting segment structure for myriampere degree current feed |
| CN109341866A (en) * | 2018-11-07 | 2019-02-15 | 大连理工大学 | A kind of self power generation intelligent thermometer |
| CN110057585A (en) * | 2019-04-18 | 2019-07-26 | 浙江兆丰机电股份有限公司 | The Multifunction Sensor and its hub bearing being mounted on hub bearing |
| CN110261694A (en) * | 2019-05-17 | 2019-09-20 | 中国科学院合肥物质科学研究院 | A kind of variable bending criticality energy test sample bar of Superconducting Strand |
| CN110873817A (en) * | 2018-08-30 | 2020-03-10 | 西部超导材料科技股份有限公司 | Method for guaranteeing accuracy and stability of critical current measurement system |
| CN112542269A (en) * | 2020-11-30 | 2021-03-23 | 中国科学院合肥物质科学研究院 | Preparation method of tensile strain critical current test sample of niobium-tin superconducting wire |
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2015
- 2015-05-13 CN CN201510242764.6A patent/CN104952549A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106370952A (en) * | 2016-09-23 | 2017-02-01 | 西南交通大学 | Measuring device for measuring critical current characteristics of high-temperature superconducting coil under magnetic disturbance and method of measuring device |
| CN106872733A (en) * | 2017-01-16 | 2017-06-20 | 中国科学院合肥物质科学研究院 | 2kA superconductive strand critical current test sample holders |
| CN109100582B (en) * | 2017-06-20 | 2021-09-03 | 中国电力科学研究院 | High-temperature superconducting strip short and straight sample foundation test framework |
| CN109100582A (en) * | 2017-06-20 | 2018-12-28 | 中国电力科学研究院 | A kind of short straight basic test skeleton of sample of high-temperature superconductor band |
| CN108106935A (en) * | 2017-11-24 | 2018-06-01 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of superconducting line axial strain |
| CN108398337A (en) * | 2018-03-12 | 2018-08-14 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of Superconducting Strand partial lateral compression strain |
| CN108680770A (en) * | 2018-04-03 | 2018-10-19 | 中国科学院合肥物质科学研究院 | A kind of universal low noise electrical measurement specimen holder |
| CN108680770B (en) * | 2018-04-03 | 2023-08-22 | 中国科学院合肥物质科学研究院 | Universal low-noise electrical measurement sample rod |
| CN108573789A (en) * | 2018-06-29 | 2018-09-25 | 宁波健信核磁技术有限公司 | A kind of fixing device of high-temperature superconductive lead wire |
| CN108573789B (en) * | 2018-06-29 | 2024-04-19 | 宁波健信超导科技股份有限公司 | Fixing device for high-temperature superconductive current lead |
| CN110873817A (en) * | 2018-08-30 | 2020-03-10 | 西部超导材料科技股份有限公司 | Method for guaranteeing accuracy and stability of critical current measurement system |
| CN109215931A (en) * | 2018-09-19 | 2019-01-15 | 中国科学院合肥物质科学研究院 | A kind of low-temperature superconducting segment structure for myriampere degree current feed |
| CN109341866A (en) * | 2018-11-07 | 2019-02-15 | 大连理工大学 | A kind of self power generation intelligent thermometer |
| CN110057585A (en) * | 2019-04-18 | 2019-07-26 | 浙江兆丰机电股份有限公司 | The Multifunction Sensor and its hub bearing being mounted on hub bearing |
| CN110261694B (en) * | 2019-05-17 | 2021-08-10 | 中国科学院合肥物质科学研究院 | Variable bending critical performance test sample rod for superconducting stranded wire |
| CN110261694A (en) * | 2019-05-17 | 2019-09-20 | 中国科学院合肥物质科学研究院 | A kind of variable bending criticality energy test sample bar of Superconducting Strand |
| CN112542269A (en) * | 2020-11-30 | 2021-03-23 | 中国科学院合肥物质科学研究院 | Preparation method of tensile strain critical current test sample of niobium-tin superconducting wire |
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Application publication date: 20150930 |