In the context of a 3P DELTA Transformer, how is the primary current (IP) calculated from the line current (IL)?

To understand why the primary current (IP) is calculated using the formula IP = IL / 1.732, it's important to recognize the relationship between line current (IL) and primary current in a three-phase system, which is often represented using the square root of 3 (approximately 1.732).

In a three-phase system, the line current is the current flowing in each of the phases, while the primary current is the current that is delivered to the transformer or load. When working with balanced loads in a three-phase circuit, the relationship between line current and phase current (or primary current in this context) can be established through the square root of 3. This arises from the geometry of the phase voltages and currents in a three-phase system.

Since the primary winding of a transformer is usually connected to the phases of the power delivery, the primary current can be derived from the line current by dividing by the square root of 3. This results in the formula IP = IL / 1.732, which accurately represents how the primary current is calculated in relation to the line current.

Using this formula allows for the correct calculation of the primary current when knowing the line current in a three-phase transformer setup, making it essential for understanding