ELEC 250 Lecture Notes - Lecture 2: Ac Power, Induction Motor
Document Summary
Q 1: three single phase transformers are connected in delta-delta to step down a line voltage of. 138 kv to 4160 v to supply power to a manufacturing plant. The plant draws 21 mw at a lagging power factor of 0. 86. Q 2: three single phase step-up transformers rated at 40 mva, 13. 2 kv/80 kv are connected in delta- If they feed a 90 mva load, calculate the following: the secondary line voltage, the currents in the transformers windings, the incoming and outgoing transmission line currents. Q 3: three single phase transformers are connected in delta-delta to step down 13. 8 kv to 2400 v for a pumping station. The pump is rated 16 mw at 0. 8 lagging power factor. Calculate the following: the currents in the primary and secondary windings of each transformer, the load carried by each transformer. Q4: three single phase transformers rated 60mva, 13. 8 kv/100 kv are connected delta-wye.
