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A TransCARE® study showed a defect in the HV winding even though IR, resistance and tan delta values were acceptable. The partial discharge patterns high internal discharges. Physical inspection confirmed that there was a short circuit in the R-Phase of the HV winding.
A TransCARE® study showed severe insulation degradation, based on the IR & tan delta results. Furan testing further confirmed that the transformer winding was near the end of its life. Physical inspection confirmed the same and the transformer had to be rewound.
A TransCARE® study showed winding deformation between the R & Y Phases, based on SFRA. Physical inspection showed that the pressboard insulation had become wavy due to coaxial forces and had high chances of failure.