Voltamp, Oman manufactures all Types of Oil filled Transformers a per IEC and BS Standards as per Speicifcation. Mineral Oil filled Three-phase 3.3 kv to 34.5kV high voltage 50/60 Hz Single & Dual Ratio Naturally cooled (ONAN) Either hermetically sealed or breathing type with conservator Copper Foil Wound Construction for Low Voltage Step Lap Core Construction