IEC 61788-4:2016 PDF

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

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Title (English):

IEC 61788-4:2016

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

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 65
Publication date:: January 19, 2016
Edition:: IEC IS 61788 edition 4 version 1
ICS:: 17.220.20

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Description (English):

IEC 61788-4:2016 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. 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 fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision.

Technical details

Technical committee: TC 90 - Superconductivity
SKU: IEC 61788-4:2016

Abstract

Overview

IEC 61788-4:2016, published by the International Electrotechnical Commission (IEC), defines a standardized test method for measuring the residual resistance ratio (RRR) of Nb-Ti and Nb₃Sn composite superconductors. The RRR is a crucial parameter for evaluating the quality and performance of superconducting wires used in advanced electrical and electronic applications. This standard addresses specimens with copper (Cu), copper-nickel (Cu-Ni), Cu/Cu-Ni, and aluminum (Al) matrices, particularly those with a monolithic structure, a rectangular or round cross-section, RRR below 350, and a cross-sectional area less than 3 mm². For Nb₃Sn conductors, a reaction heat-treatment is required.

IEC 61788-4:2016 is essential for manufacturers, testing laboratories, and users of superconducting materials, ensuring reliable and reproducible determination of RRR, thus supporting quality control and product consistency.

Key Topics

Residual Resistance Ratio (RRR): RRR is the ratio between a superconducting wire's resistance at room temperature (293 K) and just above the superconducting transition temperature. This value is a key indicator of the purity and performance of the matrix material, often copper, in superconductors.
Test Methodology: The standard specifies a four-terminal measurement technique for resistance determination at both room and cryogenic (liquid helium) temperatures, eliminating errors from contact and lead resistances.
Specimen Requirements: Applicable to monolithic, rectangular, or round wire specimens with RRR

Related standards

Other IEC standards

Overview

Key Topics

Residual Resistance Ratio (RRR): RRR is the ratio between a superconducting wire's resistance at room temperature (293 K) and just above the superconducting transition temperature. This value is a key indicator of the purity and performance of the matrix material, often copper, in superconductors.
Test Methodology: The standard specifies a four-terminal measurement technique for resistance determination at both room and cryogenic (liquid helium) temperatures, eliminating errors from contact and lead resistances.
Specimen Requirements: Applicable to monolithic, rectangular, or round wire specimens with RRR

IEC 61788-4:2016 PDF

Technical details

Abstract

Overview

Key Topics

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Abstract

Overview

Key Topics

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