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Homepage>BS Standards>17 METROLOGY AND MEASUREMENT. PHYSICAL PHENOMENA>17.200 Thermodynamics and temperature measurements>17.200.20 Temperature-measuring instruments>BS EN IEC 61788-4:2020 Superconductivity Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors
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immediate downloadReleased: 2020-05-20

BS EN IEC 61788-4:2020

Superconductivity Residual resistance ratio measurement. Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors

CURRENCY
LANGUAGE
English
Standard number:BS EN IEC 61788-4:2020
Pages:40
Released:2020-05-20
ISBN:978 0 539 02237 7
Status:Standard
DESCRIPTION
This standard BS EN IEC 61788-4:2020 Superconductivity is classified in these ICS categories:
  • 17.220.20 Measurement of electrical and magnetic quantities
  • 17.200.20 Temperature-measuring instruments
  • 29.050 Superconductivity and conducting materials
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: a) change in the suitable distance of voltage taps on the specimen for reliable measurement, b) 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, c) revision of the confusing definitions of the copper ratio and copper fraction.
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