In transformer inrush considerations, magnetizing inrush occurs on which winding when energized?

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Multiple Choice

In transformer inrush considerations, magnetizing inrush occurs on which winding when energized?

Explanation:
Magnetizing inrush is the surge current needed to establish the transformer's magnetic field. This current flows through the winding connected to the power source—the primary—because it is the excitation path that drives core flux. The secondary winding does not actively generate the magnetizing current; it only carries current based on the induced voltage and any load connected on that side. When you energize with the secondary open (or lightly loaded), the primary current spikes as the core flux rises toward its operating level. Residual flux from a previous run can affect the spike's size, but the source-facing winding—the primary—is where the magnetizing inrush originates.

Magnetizing inrush is the surge current needed to establish the transformer's magnetic field. This current flows through the winding connected to the power source—the primary—because it is the excitation path that drives core flux. The secondary winding does not actively generate the magnetizing current; it only carries current based on the induced voltage and any load connected on that side. When you energize with the secondary open (or lightly loaded), the primary current spikes as the core flux rises toward its operating level. Residual flux from a previous run can affect the spike's size, but the source-facing winding—the primary—is where the magnetizing inrush originates.

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