Study on Performance of Deeply Regenerated Insulating Oil Enhanced with Micro-nano Composite Fibers
Under the influence of sustained high temperatures,electric fields,and the catalytic effects of copper and iron metals,insulating oil undergoes an aging process,generating various impurities.These impurities can disrupt the stable operation of electrical equipment.Consequently,periodic replacement or purification of the insulating oil is imperative to ensure equipment stability.Conventional purification methods have been observed to be inefficient in removing fine particles and acid degradation products.To enhance the purification process of aging insulating oil,this study employs the electrostatic spinning method to fabricate surface-modified micro-nanocomposite fiber filtration membranes with varying PVDF concentrations.Characterization tests of the micro-nanocomposite fiber membrane reveal a gradual increase in the diameter of PVDF micro-nanofibers in proportion to the concentration of the prepared mixed solution.Simultaneously,the a-phase within the nanofibers diminishes gradually,while the content of β-phase exhibits an upward trend.The surface-modified micro-and nano-composite fiber membrane exhibits pronounced hydrophobicity,achieving a water filtration rate of 98.8％.This leads to a 50.38％increase in the breakdown voltage of the aged oil,substantially restoring its insulating properties.The surface-modified micro-and nano-composite fiber filter membrane,fabricated through electrostatic spinning technology,effectively eliminates water and charged colloids present in aged insulating oil.This presents a more pragmatic approach to insulating oil rejuvenation.
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