标准摘要
[中文适用范围]： 本部分IEC 61788规定了在无应变条件和零外磁场下，测定Nb-Ti和Nb3Sn复合超导体与Cu、Cu-Ni、Cu/Cu-Ni和Al基体的残余电阻比（RRR）的试验方法。该方法适用于具有整体结构、横截面为矩形或圆形、RRR值小于350、横截面积小于3 mm²的超导体试样。对于Nb3Sn，试样需经过反应热处理。 [外文原描述]： 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.
英文名称Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors