In this paper, the dielectric properties of polypropylene (PP) films under different magnetic field are investigated. The insulation degradation mechanism is analyzed. A performance optimization method based on Fe3O4 nano doping is proposed. After the doping modification, the conductivity decreases by 64.7% and the breakdown strength is enhanced to 124% at 12 T. This paper provides a reference for the performance improvements of PP film under the magnetic field.

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