Understanding the Flow Electrification of Synthetic Ester fluid Adopting Spinning Disc Method

Accelerated thermal aging of synthetic ester fluid is carried at 120°C and their subsequent variation in charging tendency and dielectric properties with oil and pressboard were studied. Spinning disc system simulates the electrification phenomenon in laboratory conditions. The Flow electrification process is simulated with three configurations as, virgin oil with pressboard, aged oil with pressboard and aged pressboard with the fresh oil. The generation of current magnitude increases with the rotational speed of disc and with temperature. In addition, drastic reduction is observed with aged specimen. Surface potential measurement in pressboard is performed with +/-DC voltage profiles. Higher accumulation of charge and relatively lower charge decay performance is exhibited by aged specimens. In addition, Dielectric relaxation spectroscopy (DRS) studies exhibits the dielectric characterization of oil, the aged specimen is found to have a higher loss factor. Dielectric parameters are responsible for the electrification at the interface of the medium.