TRAINING COURSE:
Transformer Connections, Part 2
Course Category: Transmission and Distribution
Course description: The purpose of this course is to teach how common types of overhead transformers can be connected together. Both single-phase and three-phase transformers are covered, but the emphasis is on three-phase connections of three single-phase transformers. The course presents connection theory using phasor diagrams and demonstrates how each of the connections is made. At the conclusion of this course, participants should be able to describe and demonstrate how to make three-phase connections in all of the following configurations: delta-wye, wye-delta, alternative delta-delta, and alternative wye-delta. Participants should also be able to show these connections using phasor diagrams. They should be able to demonstrate how to connect transformers to form an open bank in the configurations of delta-delta and wye-delta.
Course syllabus:
- Describe the basic requirements for connecting units together to form a three-phase bank
- Explain connection principles and theory using phasor diagrams
- Demonstrate and explain that delta-wye and wye-delta three-phase connections have angular displacements of 30 degrees
- Demonstrate and explain how a delta-wye three-phase connection producing 30 degrees of angular displacement is made using subtractive-polarity transformers
- Demonstrate and explain how a wye-delta three-phase connection producing 30 degrees of angular displacement is made
- Demonstrate and explain phasor diagrams and angular displacement using alternative connections
- Demonstrate and explain how an alternative delta-delta three-phase connection producing 180 degrees of angular displacement can be made
- Demonstrate and explain how an alternative wye-delta three-phase connection producing 210 degrees of angular displacement can be made
- Demonstrate and explain an open delta-delta connection producing 0 degrees of angular displacement
- Demonstrate and explain an open wye-delta three-phase connection producing 30 degrees of angular displacement
- Demonstrate and explain one example of a three-phase transformer
*This course is discounted for NATE members.
