EE 4420 Topics for Mid-Semester Test No. 1 Transformers:-Relationship between the turns ratio, voltage ratio and current ratio-Equivalent circuit of the real transformer without magnetic link and with all parameters referred to the primary side; the expressions for secondary current, voltage, leakage reactance, resistance and load impedance referred to the primary side.-voltage equations for primary winding and secondary winding; phasor diagram of currents and voltages for inductive load corresponding with the equivalent circuit-Open-circuit test: circuit diagram, equivalent circuit, equations that allow to determine the equivalent circuit parameters-Short-circuit test: circuit diagram, equivalent circuit, equations which allow determining the circuit parameters.-Power losses in a transformer: expressions for winding losses (in terms of currents), core losses (in terms of magnetic flux density and frequency); expression for transformer efficiency, condition for maximum efficiency.-
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