Dry-type transformers are more popular these days for a bunch of good reasons:
Safety:
They don't use flammable oil, so there's way less fire risk. This makes them great for indoor use - like in schools, hospitals, malls, and office buildings.
Low Maintenance:
Since there's no oil to check or change, they need way less maintenance compared to oil-filled transformers.
Eco-Friendly:
No risk of oil leaks means they're much better for the environment. Perfect for places that are strict about environmental regulations.
Durability:
Dry-type transformers are very resistant to moisture and dust, especially if they use epoxy resin insulation (like cast resin transformers). You'll find them in humid or dirty environments where oil transformers would struggle.
Installation Flexibility:
They're easier to install indoors and in confined spaces, and you don't need special fire-resistant vaults or oil spill containment.
Cooling:
They rely on air for cooling (natural or forced ventilation), so you don't need complex oil-cooling systems.
Advances in Technology:
New materials (better resins, better insulation) have made dry-type transformers more efficient and reliable, closing the performance gap with oil-filled ones.
