GB/T 21546-2008
Critical current measurement.DC critical current of Nb -Ti composite superconductors (English Version)
- Standard No.
- GB/T 21546-2008
- Language
- Chinese, Available in English version
- Release Date
- 2008
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 21546-2008
- Scope
- This standard test method is applicable to the determination of the DC critical current of a copper/niobium-titanium (Cu/Nb-Ti) composite superconductor with a copper-to-super ratio greater than 1, and is also applicable to the determination of a niobium-titanium core wire with a diameter greater than 1 μm and a copper-to-titanium ratio greater than 1. 0.9. DC critical current of copper/copper nickel/niobium titanium (Cu/Cu-Ni/Nb-Ti) superconducting wire with copper-nickel alloy (Cu-Ni)-superconductor ratio greater than 0.2. Since the critical current test methods of copper/niobium-titanium (Cu/Nb-Ti) composite superconductors and copper/copper-nickel/niobium-titanium (Cu/Cu-Ni/Nb-Ti) superconductors are slightly different, Appendix C of this standard (Normative) The special regulations to be followed when measuring copper/copper nickel/niobium titanium (Cu/Cu-Ni/Nb-Ti) superconductors will be introduced. This standard test method is applicable to superconductors whose magnetic field is less than or equal to 0.7 times the critical magnetic field above it, whose critical current is less than 1000A, and whose n value is greater than 12 under standard test conditions. During measurement, the sample to be tested should be immersed in liquid helium at a known temperature. The conductor to be tested should be an integrated superconducting wire with a circular or rectangular cross-section, and its cross-sectional area is less than 2mm2. The sample to be tested should have a helical coil geometry. This standard also gives the allowable deviation and other specific limits for this test method in routine testing. Conductors with a critical current greater than 1000A or a cross-sectional area greater than 2mm2 can also be measured by this method, but the measurement uncertainty will increase and the self-field effect will be more obvious (see Appendix B). Furthermore, for simplicity and to keep measurement uncertainties relatively low, this standard does not address special sample shapes that may be more suitable for conductors with large cross-sections. The measurement method given in this standard can be applied to determine the critical current of other types of composite superconducting wires with proper modification.
GB/T 21546-2008 Referenced Document
- GB/T 13811-2003 Electrotechnical terminology Superconductivity
GB/T 21546-2008 history
- 2008 GB/T 21546-2008 Critical current measurement.DC critical current of Nb -Ti composite superconductors