碳纤维复合材料芯软铝导线具有容量大、弧垂小、导电率高、节能效果明显等优点，是提高输电走廊容量的理想方案之一。然而，碳纤维复合材料芯抗弯曲性能弱，安装施工过程易受损断裂，缺乏有效的检测技术手段。为了解决上述问题，基于漏磁检测理论设计了一种碳纤维复合材料芯的漏磁检测方法。通过构建磁膜包覆碳纤维芯、压接金具和励磁装置的三维有限元仿真模型，分析了永磁体尺寸、磁极间距和径向气隙距离等关键参数对漏磁信号的影响，得到了优化设计参数为：永磁体尺寸L₁为15 mm，磁极距离L₂为50 mm，气隙距离M为2 mm。最后，分析了碳纤维复合材料芯断裂尺度对漏磁信号的影响，证实了碳纤维复合材料芯局部断裂缺陷漏磁检测的技术可行性。发现磁感应强度轴向分量先增大后减小，当断裂尺度d=4 mm时达到最大值，而磁感应强度径向分量则随断裂尺度的增加而增加。

Carbon fiber composite core soft aluminum conductors have the advantages of large capacity, small sag, high conductivity, and obvious energy-saving effects, making them one of the ideal solutions to improve the capacity of transmission corridors. However, the bending resistance of carbon fiber composite cores is weak, and they are prone to damage and fracture during installation and construction process, lacking effective detection techniques. In order to solve the above problems, a magnetic leakage detection method of is designed based on the theory of carbon fiber composite core magnetic leakage detection theory. Based on a three-dimensional finite element simulation model of magnetic film coated carbon fiber core, crimping fittings, and excitation device, the influences of key parameters such as permanent magnet size, magnetic pole spacing, and radial air gap distance on magnetic leakage signals are analyzed. The optimized design parameters are: permanent magnet size L₁ is 15 mm, the pole distance L₂ is 50 mm, and the gap distance M is 2 mm. Finally, the influence of the fracture scale of carbon fiber composite material cores on magnetic flux leakage signals is analyzed, confirming the technical feasibility of magnetic leakage detection for local fracture defects in carbon fiber composite cores. The axial component of magnetic induction intensity first increases and then decreases, reaching its maximum value when the fracture scale d=4 mm, while the radial component of magnetic induction intensity increases with the increase of fracture scale.