This preview shows page 1. Sign up to view the full content.
EE 4420
Topics for MidSemester 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

Opencircuit test: circuit diagram, equivalent circuit, equations that allow to
determine the equivalent circuit parameters

Shortcircuit 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.

This is the end of the preview. Sign up
to
access the rest of the document.
 Fall '10
 Wu
 Volt

Click to edit the document details