BS EN 61788-4:2011 - Superconductivity. Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti composite superconductors
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BS EN 61788-4:2011

Superconductivity. Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti composite superconductors

Status : Revised, Superseded, Withdrawn   Published : September 2011 Replaced By : BS EN 61788-4:2016

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IEC 61788-4:2011 covers a test method for the determination of the residual resistance ratio (RRR) of composite superconductors comprised of Nb-Ti filaments and Cu, Cu-Ni or Cu/Cu-Ni matrix. This method is intended for use with superconductors that have a monolithic structure with rectangular or round cross-section, RRR less than 350, and cross-sectional area less than 3 mm

2

. All measurements are done without an applied magnetic field. The method described in the body of this standard is the "reference" method and optional acquisition methods are outlined in Clause A.3. This third edition constitutes a technical revision which adds two new annexes: "Uncertainty considerations" (Annex B) and "Uncertainty evaluation in test method of RRR for NbTi" (Annex C). Copper is used as a matrix material in multifilamentary superconductors and works as an electrical shunt when the superconductivity is interrupted. It also contributes to recovery of the superconductivity by conducting heat generated in the superconductor to the surrounding coolant. The cryogenic-temperature resistivity of copper is an important quantity, which influences the stability of the superconductor. The residual resistance ratio is defined as a ratio of the resistance of the superconductor at room temperature to that just above the superconducting transition.




Standard NumberBS EN 61788-4:2011
TitleSuperconductivity. Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti composite superconductors
StatusRevised, Superseded, Withdrawn
Publication Date30 September 2011
Withdrawn Date30 April 2016
Normative References(Required to achieve compliance to this standard)IEC 60050-815
Informative References(Provided for Information)No other standards are informatively referenced
Replaced ByBS EN 61788-4:2016
ReplacesBS EN 61788-4:2007
International RelationshipsIEC 61788-4:2011,EN 61788-4:2011
DescriptorsElectric wires, Superconductors, Electric conductors, Resistance measurement, Statistical methods of analysis, Superconductivity, Electrical conductivity, Electric current, Niobium, Titanium
ICS17.220.20
29.050
Title in FrenchSupraconductivité. Mesure du rapport de résistance résiduelle. Rapport de résistance résiduelle des supraconducteurs composites de Nb-Ti
Title in GermanSupraleitfähigkeit. Messung des Restwiderstandsverhältnisses. Restwiderstandsverhältnis von Nb-Ti Verbundsupraleitern
CommitteeL/-/90
ISBN978 0 580 70238 9
PublisherBSI
FormatA4
DeliveryNo
Pages32
File Size1.677 MB
Price£182.00


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