M Niveditha 01 01 One noninvasive test which can be used to assess the condition of insulation in power transformers isdepolarization current analysis Phenomena of polarization within the insulation system may be revealed by themeasurement of the residual current via the application and removal of a DC voltage The study provides an insightinto the moisture content of the cellulose and the Oil based materials the aging effects and dielectric behavior Itoffers a reliable and fast means of identifying wear out of the insulation materials without the dismemberment of themachineries Another aid to standard testing is depolarization current analysis which enhances the conditionbasedmaintenance schedules and increases service life safety and dependability of power transformers Copyright (c) Journal of Engineering Technology and Sciences. All rights reserved 2026