Advantages of a Three Phase Transformer over a Single Phase Transformer

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Advantages and Disadvantages of a 3-Φ Transformer Over a 1-Φ Transformer

Following are the advantages of a 3-Φ transformer over a 1-Φ transformer.

Less costly
Lesser weight
Less in size
Less time required to assembling
Require less space
Deliver more power
Higher efficiency
Easier to install
Easy transportation and installation
Easy to repair
Easy assembling
The cost of a three phase transformer is lesser than the three single phase transformers having the same rating.
Finally, it is easy to obtain a single phase power supply from a three phase supply, while it is not possible to get a three phase power supply from a single phase power supply. Same is the case for single phase and three phase transformers.

Following are the disadvantages of a 3-Φ transformer over a 1-Φ transformer.

Higher cost of standby units.
More costly and repairing inconveniences.
In case of fault or failure of a three phase transformer, the power supply shutdowns in the whole connected load areas. Hence, the definite and immediate power restoration is not possible.
A three phase transformer can’t be operated temporarily in open delta connection, while it is possible in three single phase units transformer (in case of fault at single unit).
The whole unit needed to be replaced in case of failure, while in case of single phase transformers, only the fault ones should be replaced with a new one.
In case of failure of one single phase transformer (where three single phase transformers are used instead of a single three phase transformer), the remaining two single phase transformers still supply the power to the load points, while it is not possible in case of failure of a three phase transformer.