Transformer monitoring system and its testing

This study presents a transformer monitoring system designed for remote measurement of dissolved combustible gases, particularly hydrogen, as well as partial discharges (PD) and oil moisture content. The system was implemented on a 110 kV transformer in late December 2023. The behavior of oil moisture was analyzed, and based on the intensity of PD and the increase in combustible gas concentrations, an unscheduled chromatographic analysis was conducted. This analysis led to the decision to disconnect the transformer. Subsequent internal inspection revealed a defect in the input conductor of one of the phases.