Three-Phase Power Explained | 11 kV Delta to 415 V Star Transformer |

Описание: This video provides a clear, rigorous, and technically accurate explanation of three-phase power systems, with specific focus on the 11 kV Delta (Δ) primary to 415 V Star (Y) secondary distribution transformer used widely in power systems.

The lecture explains exactly what phase voltage and phase current mean, how they differ from line voltage and line current, and how these quantities behave on both the primary and secondary sides of a Δ–Y transformer.

Topics covered in this video:

Balanced three-phase system fundamentals

Difference between line and phase quantities

Delta (Δ) connection:

Line and phase voltage relationship

Line and phase current relationship

Star (Y) connection:

Line and phase voltage relationship

Line and phase current relationship

Role of neutral on the secondary side

Interpretation of 11 kV and 415 V transformer ratings

Voltage and current transformation in Δ–Y transformers

Fully worked numerical example

Common student mistakes and how to avoid them

This video is intended for:

BTech / BE Electrical Engineering students

Power Systems and Electrical Machines subjects

University exam preparation

Students who want conceptual clarity with correct equations, not shortcuts

📌 This is a technical, university-level lecture designed to remove confusion around three-phase transformers and √3 relationships.

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