Power transformers, a key element of the electrical grid, are subjected to different levels of electrical, thermal, mechanical, and chemical stress during service. To ensure reliable and safe operation, it is key to assess the continuously aging insulation of the system during a transformer’s life cycle.

Partial discharge (PD) measurements are a highly effective, non-destructive tool for the measurement, assessment, and localization of weak spots in complex insulation systems.

In OMICRON’s latest Paper of the Month, application engineer Udo Ranninger und asset expert Michael Krüger, present a detailed case study based on their experience performing PD measurement, localization and monitoring on a 300 MVA oil-filled transformer.