In practice, drying can be accelerated by combining thermal, vacuum, and electrical methods rather than relying on passive heating alone. Applying deep vacuum lowers the boiling point of water and increases the moisture diffusion rate from paper to oil and vapor. Using controlled heating (hot air, hot oil circulation, or oven heating) raises insulation temperature and speeds up moisture migration. For large units, low-frequency drying (LFD) is very effective, because it heats the windings internally and uniformly. The key is to monitor moisture evolution and avoid overheating, since excessive temperature can damage cellulose faster than it dries.