Article
Depolarization Current Analysis for Power Transformers
One non-invasive test which can be used to assess the condition of insulation in power transformers is depolarization current analysis. Phenomena of polarization within the insulation system may be revealed by the measurement of the residual current via the application and removal of a DC voltage. The study provides an insight into the moisture content of the cellulose and the Oil based materials, the aging effects and dielectric behavior. It offers a reliable and fast means of identifying wear out of the insulation materials without the dismemberment of the machineries. Another aid to standard testing is depolarization current analysis which enhances the condition-based maintenance schedules and increases service life, safety and dependability of power transformers.
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