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IEC 61788-4 Ed. 5.0 b:2020

Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors
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IEC 61788-4 Ed. 5.0 b:2020

Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors

PUBLISH DATE 2020
PAGES 74
IEC 61788-4 Ed. 5.0 b:2020

Superconductivity - Part 4: Residual resistance ratio measurement

Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors

IEC 61788-4:2020 is available as IEC 61788-4:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 61788-4:2020 specifies a test method for the determination of the residual resistance ratio (RRR) of Nb-Ti and Nb3Sn composite superconductors with Cu, Cu-Ni, Cu/Cu-Ni and Al matrix in a strain-free condition and zero external magnetic field. This method is intended for use with superconductor specimens that have a monolithic structure with rectangular or round cross-section, RRR value less than 350, and cross-sectional area less than 3 mm2. In the case of Nb3Sn, the specimens have received a reaction heat-treatment.

This fifth edition cancels and replaces the fourth edition published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:

  • Change in the suitable distance of voltage taps on the specimen for reliable measurement,
  • New report on the result of the round robin test of the residual resistance ratio of Nb3Sn superconductors that proves the validity of the measurement method in this standard,
  • Revision of the confusing definitions of the copper ratio and copper fraction.
SDO IEC: International Electrotechnical Commission
Document Number IEC 61788
Publication Date March 1, 2020
Language b - English & French
Page Count
Revision Level 5.0
Supercedes
Committee 90
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