TAMINI Transformer
40/48 MVA EAF Furnace Transformer
Technical Details
Manufacturer: Tamini Trasformatori, Italy
Year of Manufacture: 2002 (Serial No. 65467)
Type / Scope: Three-phase oil-immersed EAF furnace transformer with integrated series reactor, per IEC 76
Key technical data:
- Rated power: 40/48 MVA
- Cooling type: OFWF (oil-forced, water-forced); installation: indoor
- Rated frequency: 50 Hz
- Primary voltage (o.s.): 20 kV; secondary voltage (u.s.): 0.87 / 0.584 / 0.35 kV
- Primary current (o.s.): 1,155 A; secondary current (u.s.): 26,544 / 39,544 / 39,544 A
- Insulation level: o.s. 36–70–170 kV; u.s. 1.1–10 kV
- Vector group: Dd0 (o.s. delta / u.s. delta)
- Short-circuit impedance: 5.069% / 11.406% / 22.555%
- Rated ratio: 20/0.87, 20/0.584, 20/0.35 kV
- Temperature rise (33°C cooling water inlet): at 40 MVA, one cooler in operation — winding 50K, oil 40K; at 48 MVA overload, one cooler in operation — winding 65K, oil 50K
- On-load tap changer (transformer): 21 positions, type M III 350 Y 72.5 D 12233W 21 1 R, serial no. 585386
- On-load tap changer (series reactor): 12 positions, type M III 350 Y 72.5 D 14130 12 1 R, serial no. 585387
- Total weight: 127,000 kg; oil weight: 34,000 kg; removable-core weight: 72,000 kg; copper weight: 15,400 kg; transport weight without oil: 87,000 kg
- Oil type: Nynas 10 XT; water hazard class WGK1; PCB-free
- Cooling water: 68,000 l/h per cooler; cooling capacity 715 kW per cooler; water pressure 8 bar; water inlet temperature 33°C
Integrated series reactor:
- Rated power: 8.8 MVAr (12.7 MVAr)
- Impedance: 2.2 Ohm
- Linearity: up to ≥2.5 × In
- Insulation level: 70–170 kV
- Rated voltage: 36.6 kV
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