AC MACHINES-1 (66761) Theory
Completion requirements
9. Understand the principle of parallel operation of transformer.
9.5. List the conditions for parallel operation.
Necessary Conditions For Parallel Operation
For the satisfactory parallel operation of the transformer, the two main conditions are necessary. One is that the Polarities of the transformers must be same. Another condition is that the Turn Ratio of the transformer should be equal.
The other two desirable conditions are as follows:-
- The voltage at full load across the transformer internal impedance should be equal.
- The ratio of their winding resistances to reactances should be equal for both the transformers. This condition ensures that both transformers operate at the same power factor, thus sharing their active power and reactive volt-amperes according to their ratings.
- For the satisfactory parallel operation of the transformer, the two main conditions are necessary. One is that the Polarities of the transformers must be same. Another condition is that the Turn Ratio of the transformer should be equal. The voltage at full load across the transformer internal impedance should be equal.
