根据输电线压接头处的实际结构与检测要求,以直流电磁铁作为激励源,提出了一种新型的漏磁检测方式。运用ANSYS有限元分析方法建立了三维实体模型,模拟检测装置在输电线上的运动过程,得出扫描信号的特征,并仿真分析了提离、缺陷的轴向长度等因素对输出缺陷信号的影响。用线性霍尔传感器作为传感元件对仿真过程进行试验,得到的试验数据与仿真结果数据有相同的变化趋势。对LGJ-400/35钢芯铝绞线的压接头处进行了检测,说明了实际应用中影响缺陷信号的干扰因素。

According to the actual structure of transmission line joints and detection requirements,a new detection method based on magnetic flux leakage was proposed. Using ANSYS finite element analysis,the three dimensional solid model was built and the motion process of detector on transmission line was simulated to get signal features,and some factors that influence the output signal of the detection were analyzed,such as lift-off,axial length of defects etc. Using linear Hall sensors,the experiments were conducted. The experimental data and the simulation results showed the same changing trends. Then the experiment on the joints of LGJ-400/35 aluminium cable with steel cores steel reinforced was conducted and the feasibility and interference factors in application were analyzed.