How is true power (Pkw) calculated for a 3P WYE Transformer?

To understand how true power (Pkw) is calculated for a 3-Phase WYE transformer, we need to consider the formula used in three-phase power calculations. True power in a three-phase system is given by the product of the line current (IL), the line voltage (EL), and the square root of three (√3), which accounts for the phase relationship between the current and voltage, multiplied by the power factor (cos(Theta)).

This relationship can be summarized in the formula:

Pkw = IL x EL x √3 x cos(Theta)

Breaking down the components:

• IL represents the line current flowing through the transformer.

• EL is the line voltage across the transformer.

• The term √3 (or 1.732) converts the relationship from phase values to line values in three-phase systems.

• The cos(Theta) represents the power factor, which quantifies the phase difference between the voltage and current.

The inclusion of all these factors ensures that the calculation reflects the actual power consumed, taking into account the efficiency and the phase angle of the system. Hence, this option correctly represents how true power is calculated in a 3-phase WYE transformer setup.

The other choices do not incorporate all necessary components or