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Transformer kVA and Full-Load Current Calculator

Calculates single- or three-phase apparent power and primary or secondary full-load current from electrical quantities.

Inputs

Transformer data

Range: at least 0.001 V

Example starting value: 480 V line voltage. Replace it with the transformer side being checked.

Range: at least 0 A

Enter RMS line current for the selected phase model and the same operating point used for conductor impedance.

Range: at least 0 kVA

Enter the transformer nameplate rating on the selected voltage and phase basis.

Result

Calculated line current (A)
0.00
Calculated apparent power (kVA)
83.14
Calculated apparent power (kVA)
\begin{cases}\frac{\mathrm{Line\ voltage\ (V)} \cdot \mathrm{Line\ current\ (A)} \cdot \mathrm{Phase\ Factor}}{1000}&\text{if }\mathrm{Calculate} = \mathrm{kva}\\0&\text{otherwise}\end{cases}
\begin{cases}\frac{480 \cdot 100 \cdot 1.7320508075689}{1000}&\text{if }\mathrm{kva} = \mathrm{kva}\\0&\text{otherwise}\end{cases}
Calculated line current (A)
\begin{cases}\frac{\mathrm{Transformer\ rating\ (kVA)} \cdot 1000}{(\mathrm{Line\ voltage\ (V)} \cdot \mathrm{Phase\ Factor})}&\text{if }\mathrm{Calculate} = \mathrm{current}\\0&\text{otherwise}\end{cases}
\begin{cases}\frac{\varnothing \cdot 1000}{(480 \cdot 1.7320508075689)}&\text{if }\mathrm{kva} = \mathrm{current}\\0&\text{otherwise}\end{cases}

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Screening tool. Verify the adopted NFPA 70 edition, AHJ requirements, nameplate data, and project conditions before use.