What is the apparent power (Pkva) equation for a 3P DELTA Transformer?

The correct equation for calculating apparent power (Pkva) for a three-phase DELTA transformer is indeed based on the relationship between line current (IL), line voltage (EL), and the square root of 3 (approximately 1.732). This equation represents how apparent power in a three-phase system is derived by multiplying the line current by the line voltage and accounting for the three phases through the factor of √3.

In a three-phase system such as a DELTA configuration, the line voltage is equal to the phase voltage; therefore, using the line current and line voltage correctly allows you to compute the total apparent power being handled by the transformer. The formula emphasizes that in three-phase power calculations, the total apparent power is not just a simple product of voltage and current; rather, it reflects the phase angle and the three-phase nature of the system, which is represented by the multiplication by √3.

This knowledge is critical for professionals working with transformers, as it ensures accurate calculations for the power handling capabilities of electrical equipment. Understanding how to apply this formula helps in planning and optimizing the electrical systems in which such transformers operate.