IEC 61788-1-2006 超导性.第1部分:临界电流测量.铌-钛复合超导体的临界直流电流

标准号：IEC 61788-1-2006
中文标准名称：超导性.第1部分:临界电流测量.铌-钛复合超导体的临界直流电流
英文标准名称：Superconductivity - Part 1: Critical current measurement - DC critical current of Nb-Ti composite superconductors
标准类型：K10
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：K10
国际标准分类号：17.220;29.050
适用范围：This part of IEC 61788 covers a test method for the determination of the d.c. critical current ofeither Cu/Nb-Ti composite superconductors that have a copper/superconductor ratio largerthan 1 or Cu/Cu-Ni/Nb-Ti wires that have a copper/superconductor ratio larger than 0,9 and acopper alloy (Cu-Ni)/superconductor ratio larger than 0,2, where the diameter of Nb-Tisuperconducting filaments is larger than 1 μm. The changes for the Cu/Cu-Ni/Nb-Ti aredescribed in Annex C. The Cu-Ni uses all of the main part of the standard with the exceptionslisted in Annex C that replace (and in some cases are counter to) some of the steps in themain text.This method is intended for use with superconductors that have critical currents less than1 000 A and n-values larger than 12, under standard test conditions and at magnetic fieldsless than or equal to 0,7 of the upper critical magnetic field. The test specimen is immersed ina liquid helium bath at a known temperature during testing. The test conductor has amonolithic structure with a round or rectangular cross-sectional area that is less than 2 mm2.The specimen geometry used in this test method is an inductively coiled specimen. Deviationsfrom this test method that are allowed for routine tests and other specific restrictions aregiven in this standard.Test conductors with critical currents above 1 000 A or cross-sectional areas greater than2 mm2 could be measured with the present method with an anticipated increase in uncertaintyand a more significant self-field effect (see Annex B). Other, more specialized, specimen testgeometries may be more appropriate for larger conductor testing which have been omittedfrom this present standard for simplicity and to retain a lower uncertainty.The test method given in this standard is expected to apply to other superconductingcomposite wires after some appropriate modifications.