According to practical detection object of the steel core butt joints of power transmission line, two magnetic flux detection techniques with different location arrangement of electromagnet are introduced. Based on the parameters of LDJ-400/35 transmission line, the simulation model is built and computed using finite element method. The magnetic leakage technique with magnetic flux parallel to axial direction of transmission line has been proven to be more capable for detection, which will generate a bigger change of magnetic flux density in magnetic circuit. The simulation results provide dependable basis for future experimentation.%根据高压输电线的接头中两段对接钢芯拉开的缺陷情况,提出了两种不同励磁装置形式的磁通检测方法.运用有限元分析法,以LGJ-400/35型钢芯铝绞线为仿真对象,进行了有限元的建模分析和计算,分析钢芯完整和拉开两种情况下磁路空隙中磁感应强度差值的大小.最终得出使磁力线平行于输电线轴向的漏磁检测方案对于输电线钢芯拉开缺陷具有最好的检测能力,钢芯拉开引起磁路中磁感应强度的变化更大,这为今后的实验和现场应用提供了依据.
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