Overview
⚡
Calculators
8
🔄
Phase Types
1Φ & 3Φ
📐
Standards
IEC / IEEE
🏭
Core Types
Core/Shell
Calculators
🔁
Turns Ratio
Primary & Secondary Turns / Voltage
a = N1/N2 = V1/V2 = I2/I1 | Step-up: a<1, Step-down: a>1
Turns Ratio (a)
—
N2 (Turns)
—
I2 (Amps)
—
📦
Transformer kVA Sizing
Required kVA Capacity
kVA = (Total kW Load) / PF + Safety Margin
Min. kVA
—
With Growth
—
Std. Size
—
⚡
Full Load Current
Primary & Secondary FLC
I = kVA×1000 / (√3×V) [3Φ] | I = kVA×1000 / V [1Φ]
Primary Current (I1)
—
Secondary Current (I2)
—
📊
Transformer Efficiency
Core Loss, Copper Loss & Efficiency
η = Output / (Output + Iron Loss + Cu Loss) × 100%
Output (kW)
—
Total Loss (W)
—
Cu Loss (W)
—
Efficiency
—
🔗
Impedance Voltage (%Z)
Transformer Impedance & Reactance
%Z = (Vz / V_rated) × 100 | R% = (P_cu / kVA) × 100
%R (Resistance)
—
%X (Reactance)
—
Z (Ohms)
—
Max SC kVA
—
⚠️
Short Circuit Current
Fault Current at Secondary
Isc = I_FL / (%Z/100) | Fault MVA = kVA / (%Z/100)
FLC (A)
—
Fault Current (kA)
—
Fault MVA
—
📉
Voltage Regulation
No-load to Full-load Voltage Drop
VR% = (V_NL − V_FL) / V_FL × 100 | VR ≈ %R·cosφ + %X·sinφ
VR% (Measured)
—
VR% (Approx.)
—
Voltage Drop
—
🔥
Transformer Losses & All-in-One Summary
Core Loss, Copper Loss, Total Loss, Efficiency & Max Efficiency Load Point
Max η occurs when: Iron Loss = Copper Loss | Load for max η = √(Pi/Pcu) × kVA
Primary FLC
—
Secondary FLC
—
Turns Ratio
—
Output (kW)
—
Iron Loss (W)
—
Cu Loss FL (W)
—
Total Loss (W)
—
Full Load η
—
