Transformer winding – turns and voltage Ratio Name Calculate N1V1N2V2 N1, Number of turns of Primary Windings V1, Primary Voltage N2, Number of turns of Secondary Windings V2, Secondary Voltage Transformer EMF Order Number Frequency In Hz Number of Turns Maximum flux in the core In wb (weber) emf r.m.s value of EMF = RMS value of induced emf, E1 = 4.44f N1 Φm, Primary winding E2 = 4.44f N2 Φm, Secondary winding Transformer Full Load Current Web Site To calculate full load current of a Single Phase Transformer KVA Voltage 1Φ Full load current To calculate full load current of a Three Phase Transformer KVA Voltage 3Φ Full load current KVA rating of Transformer Company Rating of a Single Phase Transformer Voltage In Volts Current In Amperes 1Φ Power rating, P KVA Rating of a Three Phase Transformer Voltage In Volts Current In Amperes 3Φ Power rating, P KVA Transformer Losses – Iron loss, copper loss Twitter Copper Loss Calculation 2A, 4A, 6A,... Primary current 1Ω, 2Ω, 3Ω,... Primary Winding Resistance 3A, 5A, 7A,... Secondary current 4Ω, 5Ω, 6Ω,... Secondary Winding Resistance pcu Total Copper Loss, Pcu = w Iron Loss or Core Loss Calculation Eddy current Loss Ke co-efficient of eddy current t Thickness of the sheet Input values Maximum Flux density "Bm" and frequency 'f' is common to eddy current loss and hysteresis loss. Bmax Maximum flux density f frequency Hysteresis Loss Kh hysteresis constant Total Iron Loss in w/m3, Pi = Hysteresis Loss w/m3 Hysteresis Loss + eddy_current_loss w/m3 Eddy current Loss = iron loss watts/m3 Transformer Losses and different types Transformer Polarity Test Transformer Rating in kVA not in kW Transformer Q&A