In a 3P WYE transformer, what is the equation for EL?

In a 3-phase WYE transformer, the equation for the line-to-neutral voltage (EL) is indeed derived from the phase voltage (EP). In a WYE configuration, the relationship between line voltage and phase voltage is crucial to understand, as it highlights the conversion between these two forms of voltage.

The correct equation EL = EP x 1.732 (where 1.732 is the square root of 3) reflects the fact that the line voltage is greater than the phase voltage by a factor of √3. This is a fundamental concept in three-phase systems, where the line voltage represents the voltage measured between any two of the three phases, while the phase voltage is the voltage measured from one phase to neutral.

In practical terms, if you know the phase voltage (EP), you can easily calculate the line voltage (EL) by multiplying it by 1.732, illustrating the varying relationships in three-phase electrical systems. This relationship is essential for tasks like transformer operations, load calculations, and system analysis in three-phase electric power distributions.