[2023] Parallel Operation of Three Phase Transformer Explained

    In three phase power generation, transmission and distribution network, sometimes transformer are connected in parallel to meet the load demand.

Reasons or Advantages Parallel Operation of Three Phase Transformer

    The necessary reasons of parallel operation of transformer has been listed below.

1. To supply the load more than the rating of available individual transformer.
2. To supply the areas where single heavier transformer cannot be transported.
3. To increase redundancy or reliability of the of the power system.
4. To increase efficiency of the power system.
5. To save overall capital cost.
6. To balance the load.
7. To reduce downtime of the power system.

Conditions for parallel Operation of Three Phase Transformers

    The necessary conditions for the parallel operation of the three phase transformers has been listed below.

1. Phase sequence of all the transformers must be same.
2. The primary and secondary voltage and frequency of all the transformer must be same.
3. Polarities of all the transformer must be same.
4. Transformer should have equal per unit impedance.
5. The ratio of equivalent leakage reactance to equivalent resistance. 

Conclusion

    Hope, you have clearly understand about the parallel operation of three phase transformer, necessary conditions and necessary reasons of parallel operation of three phase transformer. Make sure to leave your opinion and suggestion about this post in the comment section below.