How do dry type transformers vs oil filled units compare in safety and cost?

Dry type transformers offer improved fire safety and simpler indoor installation but generally cost more per kVA at higher ratings and have lower maximum capacity. Oil filled units are more cost effective for large ratings and provide better cooling but require containment and fire protection. Safety considerations depend on location. Lifecycle cost often favors oil filled transformers in utility grids, while dry type units are chosen where oil risk is unacceptable.