The transformers are connected in parallel when the load on them is more than the rating of the individual transformers.so several smaller units are connect in parallel.
from the above diagram, it can be seen that the primary winding are connected to the supply bus bars while the secondary winding are connected to load bus bars.
Thus two or more transformers are connected in parallel to carry common load. If the given transformer is insufficient in capacity to deliver a particular load it may replaced by the larger unit or an additional unit. Then the primary side is connected to the same supply and the secondary side is connected to the same load circuit.
From the above diagram , It is the another form of parallel operation. The difference from the previous diagram is that the two units are first connected together and then connected to the respective supply and load circuit.
ABOVE TWO FORMS ARE APPLICABLE IN PARALLEL OPERATION OF TRANSFORMERS .☝☝
CONDITION FOR SATISFACTORY PARALLEL OPERATION:
1. The transformers are connected with same polarity. In case of three phase transformers should have same angular displacement and same phase transformers.
2. The voltage ratio of primary and secondary are should be same.
3. The frequency ratio primary and secondary must be same.
4. Percentage impedance must be equal to magnitude.
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