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Project

Reference EN 61788-4:2011
Title Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti composite superconductors
Project Number 22783
Abstract/Scope 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 mm2. 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.
Status
Published

Status

Current Stage code 6060
Current Stage code date 2011-08-26
Current Stage code deadline 2012-05-15
Deadline date for vote  

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Details

IEC Technical Body IEC/TC 90
Reference Document IEC 61788-4:2011 (EQV)
ICS 17.220.20 - Measurement of electrical and magnetic quantities
29.050 - Conducting materials
Keywords Superconductivity; Residual; Resistance; Ratio measurement; Nb-Ti composite
Note Supersedes EN 61788-4:2007
A-Deviation(s)  
Special National Condition(s)  

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History

Stage
Date
Deadline Date
Documents
6060 2011-08-26 2012-05-15 export to doc file  EN  FR  DE
5099 2011-08-15 2011-09-12  
5060 2011-06-06 2011-06-27 export to doc file  EN
5020 2011-04-01 2011-06-03  
3090 2010-09-10 2010-10-31  
5060 2010-06-14 2010-06-28 export to doc file  EN
5020 2010-01-08 2010-06-11  
1090 2010-01-05 2010-01-08  

Implementation Dates

date of Ratification (DOR) (1) 2011-08-15
date of Availability (DAV) (2) 2011-08-26
date of Announcement (DOA) (3) 2011-11-15
date of Publication (DOP) (4) 2012-05-15
date of Withdrawal (DOW) (5) 2014-08-15

Relations

Supersedes EN 61788-4:2007
Superseded by  
Normative reference (6) IEC 60050-815

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved


(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat


(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level


(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement


(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn


(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.