Where V p-pk is the peak primary voltage, and R p is the DC resistance of the primary winding, depending on the power capability of the transformer, and on how strongly the core was magnetized. When power is again applied to the primary, the peak inrush current may be as great as ![]() If the removal of power occurs at an unfavorable time, the strongest magnetic remanence will be stored in the core. ![]() The core “stores” the static magnetic bias when the power is switched off. This residual magnetism is the mechanism by which old computer core memories functioned. The absence of a gap in the toroidal core means that the maximum possible remanence (residual magnetization of the core in a particular direction and magnitude can be substantially more pronounced in a toroid when compared to an E-I laminate). ![]() Talema is successful at designing transformers with low inrush current. The characteristics which give the toroidal transformer advantages also contribute to a disadvantage: high inrush current with initial application of power. Center-Tapped Bridge Step 11: Inrush Current
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