BS EN 61788-1:2007 - Superconductivity. Critical current measurement. D.C. critical current of Nb-Ti composite superconductors

BS EN 61788-1:2007

Superconductivity. Critical current measurement. D.C. critical current of Nb-Ti composite superconductors

Status : Current   Published : February 2007

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This part of IEC 61788 covers a test method for the determination of the d.c. critical current of either Cu/Nb-Ti composite superconductors that have a copper/superconductor ratio larger than 1 or Cu/Cu-Ni/Nb-Ti wires that have a copper/superconductor ratio larger than 0,9 and a copper alloy (Cu-Ni)/superconductor ratio larger than 0,2, where the diameter of Nb-Ti superconducting filaments is larger than 1 micrometre. The changes for the Cu/Cu-Ni/Nb-Ti are described in Annex C. The Cu-Ni uses all of the main part of the standard with the exceptions listed in Annex C that replace (and in some cases are counter to) some of the steps inthe main text. This method is intended for use with superconductors that have critical currents less than 1 000 A and n-values larger than 12, under standard test conditions and at magnetic fields less than or equal to 0,7 of the upper critical magnetic field. The test specimen is immersed in a liquid helium bath at a known temperature during testing. The test conductor has a monolithic structure with a round or rectangular cross-sectional area that is less than 2 mm2. The specimen geometry used in this test method is an inductively coiled specimen. Deviations from this test method that are allowed for routine tests and other specific restrictions are given in this standard. Test conductors with critical currents above 1 000 A or cross-sectional areas greater than 2 mm2 could be measured with the present method with an anticipated increase in uncertainty and a more significant self-field effect (see Annex B). Other, more specialized, specimen test geometries may be more appropriate for larger conductor testing which have been omitted from this present standard for simplicity and to retain a lower uncertainty. The test method given in this standard is expected to apply to other superconducting composite wires after some appropriate modifications.




Standard NumberBS EN 61788-1:2007
TitleSuperconductivity. Critical current measurement. D.C. critical current of Nb-Ti composite superconductors
StatusCurrent
Publication Date28 February 2007
Normative References(Required to achieve compliance to this standard)IEC 60050-815
Informative References(Provided for Information)IEC 60050-121, EN 61788-5:2001, IEC 61788-5
ReplacesBS EN 61788-1:1998, IEC 61788-1:1998
International RelationshipsEN 61788-1:2007,IEC 61788-1:2006
DescriptorsReliability, Electrical conductivity, Electrical resistivity, Superconductivity, Direct current, Electric fields, Magnetic field effects, Current measurement, Composite materials, Copper, Niobium, Specimen preparation, Error correction, Reports, Mathematical calculations, Test equipment, Electrical properties of materials, Titanium, Testing conditions, Superconductors, Electric current
ICS17.220.01
17.220.20
29.050
Title in FrenchSupraconductivité. Mesure du courant critique. Courant critique continu de supraconducteurs en composite Nb-Ti
Title in GermanSupraleitfähigkeit. Messen des kritischen Stromes. Kritischer Strom (Gleichstrom) von Nb-Ti-Verbundsupraleitern
CommitteeL/-/90
ISBN978 0 580 50218 7
PublisherBSI
FormatA4
DeliveryYes
Pages32
File Size717 KB
Price£182.00


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