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L21 / Three-phase transformers

Three-Phase Transformers II

Apply phase conventions and delta–wye terminal relationships to transformer phasors.

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This lecture's concept outline

L21

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Original slide headings27
  1. 1Lecture outline
  2. 2Starting problem
  3. 3Textbook phase convention
  4. 4Angle conventions
  5. 5Delta-wye terminal relationships
  6. 6H-side delta phasors
  7. 7L-side wye phasors
  8. 8Dot correspondence
  9. 9Positive sequence
  10. 10L-side line voltage
  11. 11Remaining L-side voltages
  12. 12Sequence and phase displacement
  13. 13Per-unit base
  14. 14Bank impedance and winding impedance
  15. 15Example setup
  16. 16Example: solution route
  17. 17Example: two voltage ratios
  18. 18Example: winding phasors
  19. 19Example: low-side line voltage
  20. 20Example: tap angle
  21. 21Example: impedance base
  22. 22Example: rated currents
  23. 23Example: no-load model
  24. 24Practice: model and calculation
  25. 25Practice: solution
  26. 26Summary
  27. 27Closing check
Slide source

L21_three_phase_transformers_ii/L21_three_phase_transformers_ii.pdf

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EXPLORE

Experiment workspace

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Experiment direction for this lecture

Inspect terminal phasors under an explicit high-side/low-side phase convention.

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COMPUTE

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CHECK

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