Between which points would you measure to obtain line voltage in a wye system transformer?

• A. Ground to neutral
• B. Any phase to neutral
• C. Any phase to ground
• D. Any two of the three phases

Answer: (D)

To obtain line voltage in a wye system transformer, the appropriate measurement involves assessing the potential difference between any two of the three phases. In a wye configuration, the voltage between each phase and neutral represents the phase voltage, while the voltage between any two phases is known as the line voltage. This line voltage is usually higher than the phase voltage by a factor of the square root of three, specifically in a balanced system.

By measuring between any two phases, you are capturing the total voltage supplied across the system that can be utilized for various loads connected across those phases. This understanding is crucial for tasks related to troubleshooting and ensuring appropriate power supply in three-phase systems.

In contrast, the other options focus on measurements involving either neutral or ground, which yield phase voltages or ground-related voltages but do not measure the line voltage directly between phases. Understanding this distinction allows for a clearer interpretation of power dynamics in three-phase electrical systems.