What are the essential and desirable conditions for parallel operation of transformers?

Which is the most essential condition for two transformers in parallel?

Two transformers are operated in parallel, most essential condition to be satisfied is polarities should be same.

What is parallel operation?

Parallel operation is the connec- tion of two or more power sources of the same size and output volt- age to obtain a higher output cur- rent. When connecting in parallel the outputs must be connected together keeping polarity in mind. The output voltage remains the same, but the current increases.

Which of the following combination of 3 phase transformer can successfully operate in parallel?

Explanation: The V-V connected transformer and D-D connected transformers have same phase displacement, so they only can be connected in parallel to each other.

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