Thursday, October 20, 2022

Power Supplied by V-V Bank Transformer

 

Open-delta or V-V Connection of a Transformer

A V-V connection uses two single-phase transformers to produce a three-phase output. 

Here is one possible connection with 0o phase displacement:

Power Supplied by V-V Bank Transformer
Power Supplied by V-V Bank Transformer


The main advantage of a V-V is a reduction in equipment cost and physical construction space for applications where the power demand is relatively light.



Why do V-V Bank Connection?


Picture a delta-delta connected three-phase transformer, then picture one of the three-phase windings removed. That is a V-V-connected transformer. 

This connection saves money on the transformer since it has one less phase winding but at the cost of degrading the KVA rating and creating a phase imbalance.

It may happen that due to some reason, one of the transformers is removed; like maintenance, damage, faults, etc. In such a case, the second delta is broken and the connection resembles a V.

 Hence this sort of connection is also known as a V-V connection or Open-delta connection.



You may know the details about the electrical transformer from the following articles:
 

  1. Working Principle of Transformer;
  2. Transformer Construction;
  3. Core-type Transformers;
  4. Shell-type Transformers;
  5. Elementary Theory of an Ideal Transformer;
  6. E.M.F. Equation of Transformer;
  7. Voltage Transformation Ratio;
  8. Transformer with losses but no Magnetic Leakage;
  9. Transformer on No-load;
  10. Transformer on Load;
  11. Transformer with Winding Resistance but no Magnetic Leakage;
  12. Equivalent Resistance;
  13. Magnetic Leakage;
  14. Transformer with Resistance and Leakage Reactance;
  15. Simplified Diagram;
  16. Total Approximate Voltage Drop in Transformer;
  17. Exact Voltage Drop;
  18. Equivalent Circuit Transformer Tests;
  19. Open-circuit or No-load Test;
  20. Separation of Core Losses;
  21. Short-Circuit or Impedance Test;
  22. Why Transformer Rating in KVA?;
  23. Regulation of a Transformer;
  24. Percentage Resistance, Reactance, and Impedance;
  25. Kapp Regulation Diagram;
  26. Sumpner or Back-to-back-Test;
  27. The efficiency of a Transformer;
  28. Condition for Maximum Efficiency;
  29. Variation of Efficiency with Power Factor;
  30. All-day Efficiency;
  31. Auto-transformer;
  32. Conversion of 2-Winding Transformer into Auto-transformer;
  33. Parallel Operation of Single-phase Transformers;
  34. Questions and Answers on Transformers;
  35. Three-phase Transformers;
  36. Three-phase Transformer Connections;
  37. Star/Star or Y/Y Connection;
  38. Delta-Delta or ∆/∆ Connection;
  39. Wye/Delta or Y/ Connection;
  40. Delta/Wye or ∆/Y Connection;
  41. Open-Delta or V-V Connection;
  42. Power Supplied by V-V Bank;
  43. Scott Connection or T-T Connection;
  44. Three-phase to Two-Phase Conversion and vice-versa;
  45. Parallel Operation of 3-phase Transformers;
  46. Instrument Transformers;
  47. Current Transformers;
  48. Potential or Voltage Transformers.

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