Why has FR-3 transformer oil gained adoption in distribution and power transformers?

Adoption is driven by fire safety benefits, environmental compliance, and potential life extension of cellulose insulation. Utilities and industrial owners choose FR3 where fire risk is costly or where spill penalties are severe. Its biodegradability supports easier siting in sensitive locations, and the higher fire point can reduce the need for extensive fire mitigation. Many operators also value the moisture handling behavior that can improve insulation health over time. As standards and supplier availability expanded, procurement became easier, accelerating adoption in distribution and some power transformer applications.