通过测量超导电缆的原始股和从电缆中拆下来的股的短样临界电流值,从实验上研究了超导电缆中股的临界电流退化.实验结果表明对于股径为φ0.84的超导线,退化率约为3.0％;对于股径为φ1.29的超导线,退化率约为3.4％.退化的主要原因是处于梯形电缆边棱区域的每股超导线,其截面积变小,超导细丝有的发生变形或破坏。 By measuring the critical current value of the short sample of the original strand of the superconducting cable and the strands removed from the cable, the critical current degeneration of the strand in the superconducting cable is experimentally studied. The experimental results show that for the supercable with a diameter of φ0.84 The rate of degeneration is about 3.0%, and the rate of degeneration is about 3.4% for the superconducting wire with diameter of 1.29.The main reason for the degeneration is that each superconducting wire in the edge region of the ladder cable has a smaller cross-sectional area, Some superconducting filaments deformed or destroyed.