SSC SSC JE Electrical 2025 Mock Test Series (Paper 1 & Paper 2) Electrical Machines Transformer

An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

1
The transformers should belong to the same vector group
2
Ratios of the winding resistances to resistances for the transformers should be equal
3
The transformers should have the same kVA ratings
4
The transformers should not belong to the same vector group
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