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GB/T 28871-2012: Critical current measurement -- DC critical current of Nb3Sn composite superconductors
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Critical current measurement -- DC critical current of Nb3Sn composite superconductors
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GB/T 28871-2012
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Basic data | Standard ID | GB/T 28871-2012 (GB/T28871-2012) | | Description (Translated English) | Critical current measurement -- DC critical current of Nb3Sn composite superconductors | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H21 | | Classification of International Standard | 77.040.01 | | Word Count Estimation | 29,268 | | Quoted Standard | GB/T 13811-2003 | | Adopted Standard | IEC 61788-2-2006, IDT | | Regulation (derived from) | National Standards Bulletin 2012 No. 28 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the gravity classification destoner related terms and definitions, working principle, model and basic parameters, technical requirements, test methods, inspection rules and signs, packaging, transport and storage. This standard app | GB/T 28871-2012: Critical current measurement -- DC critical current of Nb3Sn composite superconductors
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Critical current measurement. DC critical current of Nb3Sn composite superconductors
ICS 77.040.01
H21
National Standards of People's Republic of China
Niobium three tin (Nb3Sn) composite superconductors
DC critical current measurement
(IEC 61788-2.2006, IDT)
Issued on. 2012-11-05
2013-02-15 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 Principle 2
5 requires 3
6 means 3
6.1 Reaction skeleton material 3
6.2 Reaction skeletal structure 3
6.3 Measurement skeleton material 3
6.4 Measurement skeleton structure 4
Measuring means 4 6.5
7 Sample Preparation 4
7.1 Samples of the reaction heat treatment installation 4
7.2 Reaction heat treatment 4
7.3 Installation of the test sample 4
7.4 sample holder 5
8 Test Step 5
Precision and accuracy of the 69 test method
9.1 Critical current 6
9.2 Temperature 6
9.3 Magnetic Field 6
9.4 Sample support structure 6
9.5 Sample protection 6
10 Calculation of results 6
10.1 critical current criterion 6
10.2 n- value (calculated selectivity, see A.7.2) 7
8 11 test reports
11.1 the sample description 8
11.2 Ic value report 8
11.3 Test Conditions Report 8
Appendix A (informative) Additional information regarding this standard Chapter 1 - Chapter 10 related 9
Annex B (informative) niobium three tin (Nb3Sn) strain effects conductor 17
Annex C (informative) Self-FET 19
Annex D (normative) Test Method 21 single skeleton
References 23
Figure 1 UI intrinsic characteristic curve 7
2 has a current transfer component UI characteristic graph 7
Figure A.1 each sample containing lead is connected to a zero voltage taps 12
Figure B.1 Typical niobium three tin (Nb3Sn) composite superconducting wire at different axial magnetic field and critical current (tensile) strain relationship [7] 18
Table A.1 niobium three tin (Nb3Sn) superconductor and thermal shrinkage rate of some other material selection 16
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard is identical with IEC 61788-2.2006 "niobium three tin composite superconductors DC critical current measurement."
The IEC 61788-2 standard for individual entries appearing in editorial errors made changes.
Normative and standards of international documents correspondence between consistency of the following documents.
--- GB/T 13811-2003 Electrotechnical terminology superconductivity (IEC 60050-815.2000, MOD).
This standard by the National Standardization Technical Committee proposed superconductivity.
This standard by the National Standardization Technical Committee superconducting (SAC/TC265) centralized.
This standard is drafted by. Institute of Electrical Engineering.
Participated in the drafting of this standard. Western Superconducting Material Technology Co., Ltd., Chinese Academy of Sciences Institute of Physics, University of Science and Technology of China.
The main drafters. Zhang Guomin, Lin Liang true, high-Hui Yin, Liu Yiping, Caolie Zhao.
Introduction
The critical current of composite superconductors for superconducting wire applications design limits. Actual operating conditions superconductor decision many of its properties,
And this standard test method available to determine the suitability of a particular superconductor required partial information.
The use of the critical current value measured by this standard may also be used to detect composite superconductors due to manufacturing process changes, process, aging or make all sorts
And superconducting properties with changes caused by external factors. If compliance with this standard to the test specification, the measurement methods for quality control,
Acceptance tests and research is very useful.
The critical current of composite superconductors affected by many factors. Testing and application of the material, it is necessary to give due consideration to these factors.
Test conditions, such as magnetic field, temperature and sample - current - relative orientation between the magnetic field and the like, to be determined depending on the application. Allowable error
Within the range, the test system to determine the configuration according to the situation of a particular sample. And specific critical current criteria determined according to the actual application status
set. If you have irregular situation tests, are advised by measuring the sample to obtain a certain number of test results.
The standard test methods mentioned are based on Cu/Nb-Ti (Cu/NbTi) composite superconductors DC critical current measurement (IEC 61788-1)
Test methods and VAMAS (Versailles advanced materials and standards) project (Nb3Sn) composite superconductors critical current test on niobium tristannoxane
Standardized preparations. And Cu/Nb-Ti (Cu/NbTi) composite superconductors as compared niobium three tin (Nb3Sn) superconductors critical current for the machine
Mechanical strain is very sensitive, therefore, may affect the test sample strain state test procedures were modified, Appendix B describes these changes
Background.
Niobium three tin (Nb3Sn) composite superconductors
DC critical current measurement
1 Scope
This standard also gives the usual test of this test method permitted deviations as well as other specifically defined.
The critical current is greater than 1000A or the total cross-sectional area greater than 2mm2 niobium three tin (Nb3Sn) superconductor can also use this method of measurement
Amount, it is expected that accuracy will be reduced, and since the field effect is more obvious (see Appendix C).
This test method is applicable to the determination method or the bronze in the production of copper, tin/copper ratio is greater than 0.2, the non-niobium three tin (Nb3Sn) complex
DC critical current of superconductors together.
This test method is applicable to the standard test conditions critical current less than 1000A, n- value is greater than the superconductor 12 and the superconductor
Magnetic field is smaller than or equal to 0.7 times the upper critical magnetic field. During the measurement, the sample immersed in liquid helium at a known temperature. Tested
Try niobium three tin composite conductor having a circular cross section integrated structure, its cross-sectional area less than 2mm2. The sample should be the induction coil geometry
shape. Furthermore, in order to maintain simplicity and precision of measurement, this standard does not address the large conductor cross-section may be more suitable for special sample
shape.
Measurement methods given in this standard in principle should also apply to the use of any other process of niobium three tin production of (Nb3Sn) superconducting compound
line. After appropriate modifications, this method is also applicable to other types of desired compound superconducting wire.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 13811-2003 Electrotechnical terminology superconductivity (eqv IEC 60050-815.2000)
3 Terms and Definitions
GB/T 13811-2003 defined and terms and definitions apply to this document.
3.1
Critical current criticalcurrent
Ic
In superconductors, it is considered to be the maximum DC current through unhindered.
NOTE. Ic is a function of temperature and magnetic field strength.
[GB/T 13811-2003 in 815-03-01]
3.2
The critical current criteria criticalcurrentcriterion
Ic criterion Iccriterion
ρ criterion determining the critical current Ic according to electric field intensity E or resistivity.
Note. Commonly used as a criterion for the electric field strength E = 10μV/m or E = 100μV/m, resistivity criterion is ρ = 10-14Ω · m or ρ = 10-13Ω · m.
[GB/T 13811-2003 in 815-03-02]
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