Double-Split Winding Transformer, 35 kV (Um 40.5 kV), 1000 kVA–63 MVA — SFF

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Special Transformers
1000 kVA – 63 MVAUp to 35 kV / 2 × LV

Where a substation feeds two separate load groups, splitting the secondary into two windings per phase limits the fault current each load sees and allows one winding to be taken out of service without disturbing the other. It is a common arrangement in railway, metro and large industrial substations.

Model / SeriesSFF series
Rated Capacity1000 kVA – 63 MVA
Voltage LevelUp to 35 kV / 2 × LV
Um (IEC 60071-1)40.5 kV
PhaseThree-phase, split secondary
Cooling MethodONAN / ONAF / OFAF
Executive StandardIEC 60076
  • Two independent LV windings per phase
  • Lower fault level at each load
  • One winding can be isolated separately
  • Higher impedance limits fault current
  • For rail, metro and industrial substations

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Double-Split Winding Transformer, 35 kV (Um 40.5 kV), 1000 kVA–63 MVA — SFF

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