AC and Lightning Impulse Breakdown Voltage Comparative Study of Mineral Oil-Based Fe 3 O 4 , Al 2 O 3 and TiO 2 Nanofluids
Résumé
This paper deals with the comparison of AC and lightning impulse breakdown voltage of mineral oil-based Fe 3 O 4 , Al 2 O 3 and TiO 2 nanofluids in different low concentrations. A statistical analysis was performed to evaluate of the AC breakdown voltage at different insulation failure risk was via Weibull and Normal distributions, and the optimal concentration of different nanoparticles at the range of 0-0.1g/L under AC condition was determined. At the optimal concentration, the AC breakdown voltage at 1% insulation failure risk of three kinds of nanofluid is improved at least 20%, and especially for TiO 2 nanofluid, the increment of breakdown voltage reaches 60%. The effect of nanoparticles on the breakdown of nanofluids is analyzed and the possible charge capture and release processes are proposed. This study can serve as a reference for insulation design using nanofluid as an insulating material.