OBJECTIVES
After studying this unit, the student will be able to
• state the purpose of a transformer.
• explain the principle of mutual induction.
· • determine the output voltage of a transformer if the input voltage and turns ratio are
known.
• determine the full-load current of a transformer given the kVA and voltages of the
primary and secondary windings.
• identify the common types of transformers from their schematic diagrams.
• read transformer winding diagrams and connect a transformer for the desired primary
and secondary voltage.
• choose the proper transformer taps to obtain the desired output voltage.
• connect buck and boost transformers to obtain desired voltage for a single-phase application.
• choose the correct transformer kVA for the application, given the voltage, current, and
phase requirement of a load.
• size overcurrent protection for dry-type transformers operating at 600 V or less.
• size the feeder conductor for the transformer and wires from the transformer to loads.
• properly ground a transformer, and the secondary electrical system produced by the
transformer.