Answer / prafulkumar

the vector group should be match(phase angle)
voltage rating should be same
frequency should be match

Answer / rakesh. a.d

Two transformers terminal voltage should be same
Two transformers impedances should be same

Answer / medroua

Mandatory conditions:
Same phase angle shift, Same polarity, Same phase sequence and same frequency.

Convenient conditions:
Same voltage ratio & Turns Ratio, Same Percentage Impedance, Same KVA Rating, Same Position of Tap changer if any.

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