Application

• Used in grid-connected solar PV plants
• Converts inverter output (low voltage AC) to grid level voltage
• Provides isolation + voltage step-up

 Solar panels → DC → inverter → AC (LV) → IDT → 11kV / 33kV grid

 Technical Configuration

 Voltage Levels

• LT Side (Inverter side):
  • 400V / 415V / 690V (typical)
  • Multiple LT windings (1, 2, or 3 inputs)
• HT Side (Grid side):
  • 11 kV / 33 kV

 Winding Configuration

• 1 LT winding → Single inverter connection
• 2 LT windings → Dual inverter input
• 3 LT windings (or more) → Multiple inverter inputs

 Multi-winding design reduces number of transformers in solar plant

 Capacity Range

• Typical: 100 kVA to 20 MVA
• Can be customized based on plant MW size

 Phase

• 3 Phase Transformer (mandatory for solar utility plants)

 Cooling

• ONAN / ONAF (oil cooled)