Study on Magnetic Leakage Device Parameters Suitable for Crimping Defects of Carbon Fiber Composite Core Conductor

Carbon fiber composite core conductor has the advantages of high conductivity, low line loss and obvious energy saving effect. It is one of the ideal schemes for capacity improvement of transmission corridors. However, at present, there is a lack of effective methods for the quality inspection of carbon fiber composite core. To solve the above problems, based on the theory of magnetic leakage detection, this paper uses magnetic film coated carbon fiber core to build a three-dimensional simulation model of crimping fittings, and analyzes the effects of exciter size, magnetic pole spacing of magnetic leakage device and radial air gap on magnetic leakage signals. The optimal parameters obtained are: Permanent magnet size L1 is 15 mm, pole distance L2 is 50 mm and gap distance M is 2 mm. Finally, the influence of fracture width of magnetic composite core conductor on magnetic leakage signal is analyzed through the above parameters of magnetic leakage device. The results show that, in the axial component of the MFL signal, the magnetic induction intensity increases first and then decreases, and the MFL signal reaches its maximum when d = 4 mm. The radial component increases with the increase of fracture width.