What does "1.732" represent in the context of a 3P WYE transformer EL equation?

In the context of a 3-phase Wye transformer EL equation, the value "1.732" represents the square root of 3. This value is significant in three-phase systems as it arises from the relationship between line-to-line voltages and line-to-neutral voltages in a Wye configuration.

In a Wye connection, the line-to-line voltage is √3 times the line-to-neutral voltage. Therefore, if you know one of these voltages, you can calculate the other using this ratio. This relationship is crucial for understanding how voltages and currents interact in balanced three-phase circuits, making it essential knowledge for anyone working with transformer equations or three-phase systems.

The other choices refer to different concepts: the voltage ratio typically does not have a fixed numerical value like 1.732, the current ratio in a Wye that refers to how phase currents relate doesn't utilize this specific number directly, and while the sine of 60 degrees is indeed 0.866 (which stems from the geometry of a 30-60-90 triangle), it doesn't pertain to the direct function of the square root of 3 in the context of a Wye transformer equation.