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ČSN EN IEC 61788-27 (345685)
Superconductivity - Part 27: Twist pitch measurement of practical superconducting wires - Twist pitch measurement of Nb-Ti/Cu and Nb-Sn/Cu composite superconductors
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NORM herausgegeben am 1.9.2025
Informationen über die Norm:
Bezeichnung normen: ČSN EN IEC 61788-27
Zeichen: 345685
Katalog-Nummer: 521817
Ausgabedatum normen: 1.9.2025
SKU: NS-1229868
Zahl der Seiten: 44
Gewicht ca.: 132 g (0.29 Pfund)
Land: Tschechische technische Norm
Kategorie: Technische Normen ČSN
Kategorie - ähnliche Normen:
Die Annotation des Normtextes ČSN EN IEC 61788-27 (345685):
This part of IEC 61788 specifies a test method for the twist pitch measurement of Nb Ti/Cu and Nb Sn/Cu composite superconductors by an untwisting method. The test method is applicable to Nb Ti/Cu and Nb Sn/Cu composite superconducting wires with monolithic structures, which have either a round cross section with a diameter ranging from 0,2 mm to 2 mm or a rectangular cross section that is equivalent in area to the round cross sectional wires. These wires possess a filament diameter ranging from 6 µm to 200 µm, a twist pitch between 5 mm and 50 mm, and a matrix of copper or copper alloy. This document uses nitric acid to remove the matrix (copper or copper alloy), so the surface of the composite superconducting wire can be plated with a material that is dissolvable by nitric acid. Though uncertainty can increase, the method can apply to Nb Ti/Cu or Nb Sn/Cu composite superconducting wires when the parameters of cross-sectional area, filament diameter and twist pitch are out of the limit. The test method specified in this document is expected to apply to other types of composite superconducting wires after some appropriate modifications
