ELCT 225 - Transformers

Credit(s): 2

This course presents students with the basic construction, operation, and maintenance principles of single-phase and three-phase transformers. Transformer construction, including core types, coil wiring ratios, tank dynamics, and cooling features involving details of magnetism, induction, and flux density will be presented. This course introduces transformer types: auto tap changer, isolation, and step up/step down, reactor, buck-boost, and current transformers; transformer operating principles featuring transformer electromagnetic coupling; transformer maintenance testing of power factor, impedance, power loss (watts loss), oil, and turns ratio. The destructive effects of harmonic distortion, improper cooling, overloading, and improper transformer connecting are highlighted along with a basic introduction to power generation and short circuit analysis. Practical information of NEMA® and ANSI® standards on insulation materials and safety will be featured. (Spring Semester)

Course Learning Outcomes: Upon completion of the course, students will be able to

Describe the construction of a single phase transformer including parts and relationships.
Define transformer terms that identify its electrical characteristics.
Perform various tests on transformers to identify transformer electrical viability.
Determine transformer polarity.
Describe paralleling of transformers and requirements needed for connectivity.
List information provided on the nameplate of transformers.
Explain transformer feedback.
Explain testing procedures using high voltage instruments in transformer testing.
Describe standard power generation and distribution systems.
Describe NEMA and ANSI standards for transformer safety and construction.