International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 61788-1:2007
Title Superconductivity - Part 1: Critical current measurement - DC critical current of Nb-Ti composite superconductors
Project Number 16902
Abstract/Scope 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.


Current Stage code 6060
Current Stage code date 2007-01-05
Current Stage code deadline 2007-09-01
Deadline date for vote  


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IEC Technical Body IEC/TC 90
Reference Document IEC 61788-1:2006 (EQV)
ICS 17.220 - Electricity. Magnetism. Electrical and magnetic measurements
29.050 - Conducting materials
Keywords Superconductivity; Critical current; Cu/Nb-Ti composite
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2007-01-05 2007-09-01 export to doc file  EN  FR  DE
5099 2006-12-01 2007-02-01  
5060 2006-10-16 2006-10-30 export to doc file  EN
5020 2006-08-11 2006-10-13  
4099 2006-04-14 2006-07-31  
4020 2005-06-17 2005-11-18  
3099 2005-06-14 2005-06-17  

Implementation Dates

date of Ratification (DOR) (1) 2006-12-01
date of Availability (DAV) (2) 2007-01-05
date of Announcement (DOA) (3) 2007-03-01
date of Publication (DOP) (4) 2007-09-01
date of Withdrawal (DOW) (5) 2009-12-01


Supersedes EN 61788-1:1998
Superseded by  
Normative reference (6) IEC 60050-815:2000

(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.