For large section members such as cables, there are insufficient methods for circumferential scanning along the cable sections for the detection of corroded broken wires. In this study, a detection method for broken wire damage (BWD) along the circumferential direction of cable based on the principle of self-magnetic flux leakage (SMFL) was proposed. First, the theoretical calculation model and the finite element model of the circumferential magnetic field in the polar coordinate system were established. The analysis results showed that the position of the BWD on the section of cable could be effectively judged by the concave position of the curves of the SMFL in the polar coordinate system. Through the circumferential scanning at different positions, the length of the BWD could be judged by the coordinates of x when the value of index “C” (similarity to circle) approached 1 for the first time in the x − C curves. Finally, the detection experiment for the BWD of a parallel wire bundle was carried out. The experimental results were consistent with the analysis results for the theoretical model and the finite element, and the experimental results verified the correctness of the detection method.

对于诸如电缆之类的大截面部件，没有足够的方法沿电缆截面进行周向扫描以检测腐蚀的断线。本研究提出了一种基于自磁通泄漏（SMFL）原理的电缆圆周方向断线损坏（BWD）的检测方法。首先，建立了极坐标系中圆周磁场的理论计算模型和有限元模型。分析结果表明，通过极坐标系中SMFL曲线的凹入位置可以有效地判断BWD在电缆截面上的位置。通过在不同位置的圆周扫描，可以通过x坐标来判断BWD的长度当索引“ C ”（与圆的相似度）的值在x - C曲线中首次接近1时。最后，进行了平行线束BWD的检测实验。实验结果与理论模型和有限元分析结果吻合，实验结果验证了该检测方法的正确性。