Do Dry Type Transformers Have Oil in Them

No, dry type transformers do not contain oil.

Unlike liquid-filled transformers that use oil for insulation and cooling, dry type transformers rely on air for cooling and solid materials like cast resin, fiberglass, or Nomex for insulation. The windings in dry type transformers are coated or encapsulated with these solid insulating materials, which provide electrical insulation and protection against environmental factors.

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