Electrical Machines 1 Quantum Pdf New -
[
\eta = \fracV_2 I_2 \cos\theta_2V_2 I_2 \cos\theta_2 + P_c + P_cu
]
Maximum efficiency occurs when copper loss = core loss.
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When energized at voltage zero crossing, high inrush current (10–20× rated) due to core saturation. Mitigation: point-on-wave switching, series resistors.
Though static, the transformer is essential in Electrical Machines 1 for understanding magnetic coupling and equivalent circuit modeling.