As for the nondestructive testing of broken strand of cable structure

many researches are focused on the magnetic flux leakage detection of wire rope

and few of the researches are related to the broken strand detection of inner layer of aluminum conductor steel reinforced. In order to optimize the structure of aluminum conductor steel reinforced magnetic flux leakage detection equipment

a finite element model for magnetic flux leakage detection equipment was established based on the related theories of steel wire rope magnetic flux leakage detection. The influence of the excitation loop form

sensor lift value

magnetic pole spacing

radial air gap and other excitation device structural parameters on the local magnetization effect of steel strand were analyzed respectively. Based on these

the dimensional parameters of the excitation structure are determined and a finite element model for leakage device for ACSR conductor broken steel strand detection is designed. The designed model was used to experimentally detect the simplified ACSR conductor broken steel strands of model LGJ-210/50. It is found that all five defects of ACSR and SWR can be effectively detected. Moreover

unlike SWR

the defect leakage images of ACSR show a thin striped shape. Therefore

the designed excitation device model has high practicality in the detection of steel core broken strands in ACSR.