Construction and Features of Three-Phase Transformers

Question 1

List four advantages that single, three-phase transformer has over a bank of single-phase transformers.

Answer 1

• Higher operating efficiency
• Less weight and occupies less space
• Lower purchase cost
• Simpler installation

Question 2

List three advantages that a bank of single-phase transformers has over a single, three-phase transformer

Answer 2

• May be operated with one unit out of service
• Less expensive to repair a single-phase transformer
• Lower cost for spare unit

Question 3

List the two common configurations in which the windings of a three-phase transformer may be connected

Answer 3

Delta or Wye