Dielectrophoretic Effect of Rejuvenation Fluid in Power Cables

To analyze the influence of the frequency and magnitude of the applied voltage on the dielectrophoresis effect of the rejuvenation fluid in cable injection repair technology, a theoretical calculation model of the dielectrophoretic force in the cable insulation layer was constructed, and the dielectrophoretic forces exerted on rejuvenation fluid particles at different positions within the insulation layer were calculated. Furthermore, a finite element calculation of the cable was established to analyze the diffusion of the rejuvenation fluid in the insulation layer driven by the dielectrophoretic force, and the simulation results were compared with the theoretical calculation results. The results indicated that the voltage magnitude primarily influenced the magnitude of the dielectrophoretic force exerted on the rejuvenation fluid particles. Additionally, within the frequency range of 0.01 Hz to 10⁶ Hz, the dielectrophoretic force exerted on the particles was always directed toward the region of higher electric field intensity. Meanwhile, under identical electric field conditions, the dielectrophoretic force exerted on the rejuvenation fluid particles in PP was approximately 13.5% larger than that in XLPE.