How to Calculate Phase to Phase Voltage

Written by thomas bourdin
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How to Calculate Phase to Phase Voltage
Calculating Phase-to-Phase Voltage (high voltage image by mashe from

Phase-to-phase voltage, also known as line voltage, is an important concept in the study of electric power distribution. These quantities are generally calculated in a three-phase power system, which is the most commonly used electric power system in motors and large-scale electric power distribution. Calculating the line voltage ensures that the system is producing voltages within the acceptable range and will not overheat or fail. Calculating the phase-to-phase voltage is a fairly straightforward process if you have an adequate knowledge of circuits.

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  1. 1

    Label the voltages within your multiphase system. Three-phase systems are the most common multiphase systems, and have well known properties.

  2. 2

    Determine the voltage between any single conductor and ground, called the phase voltage. If not already known, you may have to measure the voltage with a voltmeter. As an example, assume the measured voltage is 10 volts (V).

  3. 3

    Multiply the phase voltage by 1.7321. The resulting number is the phase-to-phase voltage (or line voltage). In our example, multiplying 10 V by 1.7321 gives 17.321 V, which is the phase-to-phase voltage.

Tips and warnings

  • Take all necessary precautions when working with electrical power sources.

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