Where are oil cooled transformer rectifiers used in industrial systems?

Oil cooled transformer rectifier sets are used where high DC power is needed continuously and heat must be managed reliably. Typical applications include electrolysis and electroplating, aluminum and steel processes, large motor drives, mining DC systems, traction substations, and industrial power supplies for furnaces or chemical plants. Oil cooling supports compact high power density designs and stable insulation under heavy duty cycles. They are usually installed in industrial rooms or outdoor skids with containment and appropriate ventilation and protection.