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DIN EN IEC 61788-27 VDE 0390-27:2025-10

Superconductivity

Part 27: Twist pitch measurement of practical superconducting wires – Twist pitch measurement of Nb-Ti/Cu and Nb-Sn/Cu composite superconductors

(IEC 61788-27:2025); German version EN IEC 61788-27:2025
Class/Status: Standard, valid
Released: 2025-10
VDE Art. No.: 0300191

Note: You can pre-order this document (delivery subject to availability). Valid from 2025-10-01.

In order to reduce coupling loss and proximity effect coupling loss induced by alternating magnetic field or current, multi-filament composite superconducting wires should be twisted. Therefore, twist pitch is a very important parameter in the design and application of composite superconducting wires, which often needs to be inspected in the last stage of fabrication. This standard specifies the untwisting method for measuring the twist pitch of Nb-Ti and Nb-Sn composite superconductors. As supplementary methods, the direct measurement method and the image processing method are specified also.