engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Electrical Machines Transformer Three Phase Transformer Connections
A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each rated 127 V / 13.2 kV. The line-to-line voltage ratio for the three-phase transformer is:
1
220 / 13.2 kV
2
127 / 13.2 kV
3
127 / 220 kV
4
220 / 220 kV