3- Phase Transformers

บทที่ 7 Three-phase
Transformers
Introduction
1. Basic properties of 3-phase
transformer bank
2. Delta-delta connection
3. Delta-wye connection
4. Wye-delta connection
5. Wye-wye connection

, Three-phase Transformers

6. Open-delta connection
7. Three-phase transformers
8. Step-up and step-down
Autotransformer
9. Phase-shift principle
10. Three-phase to 2-phase
Transformation

, Three-phase Transformers

11. Phase-shift transformer
12. Calculations involving 3-phase
Transformers
13. Polarity marking of 3-phase
transformers

, Introduction


• Thetransformers may be inherently 3-phase,
having three primary windings and three secondary
windings mounted on a 3-legged core.

• The same result can be achieved by using three
single-phase transformers connected together to
form a 3-phase transformer bank.