The main advantage of LFD is that it heats the windings internally and uniformly, instead of relying on external hot air or hot oil. This shortens drying time for thick insulation and reduces temperature gradients that can damage paper. LFD can often be done without removing the active part, and with better control of insulation temperature. Compared to ovens, it is more energy-efficient for large transformers and achieves deeper, more homogeneous drying of massive cellulose systems.