Three-Split Winding Transformer, 35 kV (Um 40.5 kV), 1600 kVA–63 MVA — SFFF

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Special Transformers
1600 kVA – 63 MVAUp to 35 kV / 3 × LV

The three-split arrangement extends the same principle further, letting a single transformer supply three separate load groups — commonly three rectifier groups in a DC substation or three distribution sections in a plant — each isolated from the others and each with its own fault-current limit.

Model / SeriesSFFF series
Rated Capacity1600 kVA – 63 MVA
Voltage LevelUp to 35 kV / 3 × LV
Um (IEC 60071-1)40.5 kV
PhaseThree-phase, triple-split secondary
Cooling MethodONAN / ONAF / OFAF
Executive StandardIEC 60076 / IEC 61378
  • Three independent LV windings per phase
  • Each load isolated from the others
  • Suits rectifier groups and DC substations
  • Controlled fault current per group
  • Space-saving for multi-load stations

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Three-Split Winding Transformer, 35 kV (Um 40.5 kV), 1600 kVA–63 MVA — SFFF

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