Transformer Current And Turn Ratio Calculator
Calculate primary and secondary full load currents, and turns ratio for single-phase or three-phase transformers.
Input Parameters
- Transformer Rating: Maximum load capacity in VA, kVA, or MVA
- Primary Voltage: Input voltage to the transformer
- Secondary Voltage: Output voltage from the transformer
- Phase Configuration: Single-phase or three-phase operation
Calculator Output
- Primary Current: Current in primary winding (A)
- Secondary Current: Current in secondary winding (A)
- Turn Ratio: Primary to secondary voltage ratio
Transformer Equations
Turn Ratio:
\[a = \frac{N_1}{N_2} = \frac{V_1}{V_2} = \frac{I_2}{I_1}\]Single-Phase Primary Current:
\[I_1 = \frac{S}{V_1}\]Single-Phase Secondary Current:
\[I_2 = \frac{S}{V_2}\]Three-Phase Primary Current:
\[I_1 = \frac{S}{\sqrt{3}V_1}\]Three-Phase Secondary Current:
\[I_2 = \frac{S}{\sqrt{3}V_2}\]Where:
- \(a\): Turn ratio
- \(N_1, N_2\): Number of turns in primary and secondary
- \(V_1, V_2\): Primary and secondary voltages
- \(I_1, I_2\): Primary and secondary currents
- \(S\): Transformer rating (VA, kVA, or MVA)
Applications
Use this calculator to:
- Design electrical circuits with transformers
- Verify transformer operating limits
- Prevent system overloads
- Select appropriate transformers for your application
- Ensure safety in electrical installations