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Design of Three Phase Transformer

Design of Three Phase Transformer. Contents. Types of transformers Position of HV & LV windings Core & Yoke cross-sectional area Importance of mitered joints Different types of transformers windings Different methods for cooling of transformers. Types of transformers.

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Design of Three Phase Transformer

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  1. Design of Three Phase Transformer

  2. Contents • Types of transformers • Position of HV & LV windings • Core & Yoke cross-sectional area • Importance of mitered joints • Different types of transformers windings • Different methods for cooling of transformers

  3. Types of transformers • Power transformers • Distribution transformers • Step-up transformers • Step-down transformers • Core type transformers • Shell type transformers • Single phase transformers • Three phase transformers

  4. Position of HV & LV windings

  5. Core & Yoke cross-sectional area

  6. The Iron loss and the no load current can be decreased if the flux lines are made to flow along the direction of the grain orientation. This is possible in mitred (bevelled) joints are used for cores and yoke as shown in figure. Importance of Mitred joints

  7. Different types of transformers windings • Cylindrical windings • Helical windings • Double helical windings • Multi-layer helical windings • Cross-over windings • Disc & continuous disc windings • Aluminum windings

  8. Different methods for cooling of transformers • Medium=> Air=> Gas=> Synthetic oil=> Mineral oil=> Solid insulation=> Water • Circulation=> Natural=> Forced

  9. Cooling method for DRY type x’mer1) Air natural (AN)2) Air Blast (AB) • Cooling methods for Oil immersed x’mer1) Oil Natural (ON)2) Oil Natural Air Forced (ONAF)3) Oil Natural Water Forced (ONWF)4) Forced Circulation of Oil (OF) i) Oil Forced Air Natural (OAFN) ii) Oil Forced Air Forced (OFAF) iii) Oil Forced Water Forced (OFWF)

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