Advantages of Three Phase Transformer over Single Phase Transformer

• Generally, electrical energy is generated in generating stations by 3-phase alternators. 3-phase system is used for transmission and distribution of Electric-energy. For stepping down or stepping up the voltage of these systems, 3-phase transformers are used.

Advantages of 3-Phase Transformer over 1-Phase Transformer (For Same Capacity)
Q. State the advantages of three phase transformer over single phase transformer of the same capacity.

1. The cost of one three-phase transformer is less than the 3-unit of single phase transformers.
2. Weight of one unit of 3-phase transformer is lesser than weight of 3-units of single phase transformer.
3. Space occupied by one unit of 3-phase transformer is lesser than space occupied by 3-units of single phase transformers.
4. The bus-bar structure, switch gear and other wiring of 3-phase transformer is cheaper and simple in comparison with 3-units of single phase transformers.
5. Three – phase transformers are highly efficient.

• It should be mentioned here one advantage of using 3-units of single phase transformers is that if one of the units becomes faulty, the remaining units can supply electric energy partially.
• Similarly only one additional unit can be kept as standby which is cheaper than keeping one unit of 3-phase transformer as standby.