Line Phase Voltage Calculator

Changing Line-to-line voltage

Change Line-to-line voltage from 400 V to 480 V and preserve the rest of the case. This moves the answer from 230.94 V to 277.13 V.

The comparison demonstrates sensitivity, not a guaranteed field response.

Wye phase voltage: calculation method

The arithmetic is based on Vphase,wye = Vline ÷ √3. Only Line-to-line voltage enter the numerical result.

For the example shown, wye phase voltage equals 230.94 V. Treat that value as a demonstration, not a recommendation.

Convert line voltage to phase voltage. Continue to Power Factor Correction Calculator if required capacitor reactive power is also needed.

Before entering values

Keep distorted-waveform measurements separate from sine-wave assumptions. Write down whether each entry is measured, rated, assumed, or calculated.

Confirm decimal placement whenever a source uses a different unit scale. A later line current decision can draw on Three-Phase Motor Current Calculator.

Line-to-line voltage

Default example: 400 V. Enter line-to-line voltage in V.

Applying the result

The primary answer, Wye phase voltage, describes only the entered scenario. Compare it with a measured RMS case at the same frequency.

A result without its source conditions is difficult to compare or audit.

Transferring the result

Archive line-to-line voltage with wye phase voltage. Identify the instrument, rating, or assumption behind each entry.

Transfer wye phase voltage with all available digits during downstream arithmetic. Keep a separate displayed value if reporting precision differs.

What the formula leaves out

Confirm whether the load is connected in wye or delta.

Additional checks may be needed for frequency-dependent loss, parasitics, and waveform distortion. Test an additional scenario when an omitted effect has a plausible range.

Use RMS values unless an input explicitly requests peak amplitude.

A final reasonableness check

Begin by confirming line-to-line voltage at the operating point represented by the other entries. Record whether it came from a meter, nameplate, data sheet, or design assumption.

After calculating wye phase voltage, compare its magnitude with impedance, phase, waveform, and equipment ratings. An independent order-of-magnitude check can reveal a misplaced decimal or unit prefix.

If uncertainty remains, calculate labeled low and high cases. Include startup transients, resonance, and measurement bandwidth when those effects can change the decision.

Questions about Line Phase Voltage