IEC 61788-21:2015

Overview

IEC 61788-21:2015 is an international standard published by the International Electrotechnical Commission (IEC) that defines test methods for practical superconducting (SC) wires. This standard focuses on validating the mechanical, electrical, and superconducting properties essential for practical use. Practical SC wires are those available in continuous lengths suitable for manufacturing devices, excluding multi-wire conductors like cables. By establishing standardized testing protocols, IEC 61788-21 facilitates the procurement, quality assurance, design, and engineering of superconducting wire products in various industrial applications.

The standard supports the development and certification of SC wires that meet critical performance criteria, ensuring reliable operation under specified conditions. It aligns with other parts of the IEC 61788 series, creating a comprehensive framework for superconducting materials and their applications.

Key Topics

• Test Methods for SC Wire Properties
  Specifies standardized procedures for assessing critical attributes of SC wires, including mechanical strength, superconducting critical currents, electrical characteristics, and response to environmental factors.

• Mechanical Properties
  Measurement techniques to determine tensile strength, strain effects, and durability which are crucial for engineering integration and device stability.

• Superconducting Characteristics
  Evaluation of critical temperature, critical magnetic fields, critical current capacity, n-value, and AC losses that define the wire’s superconducting performance.

• Uniformity and Stability
  Assessing the consistency of properties along the wire's length and its operational stability under practical working conditions.

• Related IEC Standards
  Complements several IEC 61788 parts, including measurement methods for critical current (Parts 1, 2, 3), residual resistance ratio (Parts 4, 11), volume ratio measurements (Parts 5, 12), mechanical tests (Parts 6, 18, 19), AC loss measurements (Parts 8, 13), and critical temperature tests (Part 10).

• Normative References and Terminology
  Utilizes definitions from IEC 60050 and provides guidance on applying terminology consistently for clear communication in the superconductivity field.

Applications

IEC 61788-21 is essential for industries and research sectors where superconducting wires are employed, including:

• Medical Technology
  Manufacturing of MRI and other imaging systems that depend on stable, high-performance superconducting wires.

• Energy Sector
  Superconducting cables, fault current limiters, transformers, and power storage devices that require wires meeting stringent operational standards.

• Scientific Research
  Particle accelerators, fusion reactors, and low-temperature physics experiments utilizing SC wires with validated performance characteristics.

• Transportation and Electronics
  Components for advanced transportation systems, including maglev trains and high-efficiency electronic devices.

Implementing IEC 61788-21 aids in ensuring that superconducting wire materials meet predetermined benchmarks enabling device manufacturers to design with confidence in product reliability and safety.

Related Standards

IEC 61788-21 serves as part of a broader family of superconductivity standards, including:

• IEC 61788-1 to IEC 61788-3 – DC critical current measurement methods for different superconducting composites.
• IEC 61788-4 and 61788-11 – Residual resistance ratio measurement protocols for Nb-Ti and Nb3Sn wires.
• IEC 61788-5 and 61788-12 – Methods to determine copper to superconductor volume ratios.
• IEC 61788-6, 61788-18, 61788-19 – Mechanical testing standards focusing on tensile tests at room temperature.
• IEC 61788-8 and 61788-13 – AC loss testing methods applicable to various superconductor wire geometries.
• IEC 61788-10 – Critical temperature measurement techniques by resistance.

These standards collectively ensure comprehensive assessment and consistency across the lifecycle of superconducting wires, from production to end-use.

Keywords: IEC 61788-21, superconducting wires, superconductivity standards, test methods, critical current measurement, mechanical properties, electrical properties, AC loss, critical temperature, IEC 61788 series, superconducting wire certification, practical superconducting wire testing, IEC standards, superconductivity testing guidance, superconducting wire applications.