GB/T 28871-2012Critical current measurement -- DC critical current of Nb3Sn composite superconductors (English PDF)
铌三锡(Nb3Sn)复合超导体的直流临界电流测量
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Level / Type
National · Recommended
Issue date
November 5, 2012
Implementation date
February 15, 2013
Scope
GB/T 28871-2012 is the English-translated version of 铌三锡(Nb3Sn)复合超导体的直流临界电流测量.
GB/T 28871-2012 is the Chinese standard "Critical current measurement -- DC critical current of Nb3Sn composite superconductors". Its scope clause reads: 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. Its clauses include terms and definitions.
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Document preview — GB/T 28871-2012
National Standard of the People's Republic of China
- ICS
- 77.040.01
- Classification
- H 21
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Contents
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Principle
- 5 requires
- 6 means
- 6.1 Reaction skeleton material
- 6.2 Reaction skeletal structure
- 6.3 Measurement skeleton material
- 6.4 Measurement skeleton structure
- 7 Sample Preparation
- 7.1 Samples of the reaction heat treatment installation
- 7.2 Reaction heat treatment
- 7.3 Installation of the test sample
- 7.4 sample holder
- 8 Test Step
- 9.1 Critical current
- 9.2 Temperature
- 9.3 Magnetic Field
- 9.4 Sample support structure
- 9.5 Sample protection
- 10 Calculation of results
- 10.1 critical current criterion
- 10.2 n- value (calculated selectivity, see A.7.2)
- 11 test reports
- 11.1 the sample description
- 11.2 Ic value report
- 11.3 Test Conditions Report
- Appendix A (informative) Additional information regarding this standard Chapter 1 - Chapter 10 related
- Annex B (informative) niobium three tin (Nb3Sn) strain effects conductor
- Annex C (informative) Self-FET
- Annex D (normative) Test Method 21 single skeleton
- References
- 2 has a current transfer component UI characteristic graph
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
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
Ic criterion Iccriterion
rho 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 rho = 10-14ohm · m or rho = 10-13ohm · m.
[GB/T 13811-2003 in 815-03-02]
GB/T 23365 | GB/T 24488 | GB/T 34190 | GB/T 47091 | GB/T 43894.2 | GB/T 13221 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 49 pages — is available in the English PDF.
Referenced standards
Normative references
GB/T 13811-2003 · IEC 60050
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