Enter your Transformer Rating, Number of Phases, Primary and Secondary Voltages, and Turns per Volt into the Transformer Winding Calculator to find your Primary and Secondary Turns, Turns Ratio, and both Primary and Secondary Currents — everything you need to spec out a winding design in one shot.
Primary Turns
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Secondary Turns
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Turns Ratio
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Primary Current
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Secondary Current
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Transformer Type
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The turns ratio is calculated by dividing the primary voltage by the secondary voltage (Np/Ns = Vp/Vs). This ratio determines whether the transformer steps up or steps down voltage.
A step-up transformer increases voltage from primary to secondary (turns ratio > 1), while a step-down transformer decreases voltage (turns ratio < 1). The type is determined by comparing primary and secondary voltages.
Turns per volt depends on the transformer core material, cross-sectional area, and operating frequency. It's typically between 1-10 turns/volt for power transformers and can be calculated using the transformer equation V = 4.44 × f × N × Φ.
Key factors include primary and secondary voltages, transformer rating (VA/kVA/MVA), number of phases, core material, operating frequency, and desired regulation. These determine the turns ratio and current ratings.
For single-phase: I = S/V, for three-phase: I = S/(√3 × V), where S is apparent power and V is voltage. The current is inversely proportional to voltage - higher voltage side has lower current.
Transformers follow the principle: Np/Ns = Vp/Vs = Is/Ip. This means the turns ratio equals the voltage ratio and is inversely proportional to the current ratio.
Yes, the calculator handles both single-phase and three-phase transformers. For three-phase calculations, it uses the appropriate formulas that account for the √3 factor in power and current calculations.
The calculator supports multiple units: VA, kVA, MVA for power ratings, and V, kV, MV for voltages. Choose the appropriate units based on your transformer size and application.