A three phase bank of three 75-kVA single phase transfogmers steps the three-phase primary feeder voltage from 1247 kV to 208/120 V and is connected as shown below. The three-phase bank is supplying a thrée-phase wye-connected induction rhotor load operating at 0.75_power factor, 90 kW Tagging output power and 80% efficiency. a. Draw two phasor diagrams for the primary and secondary voltages. b. Determine the phase difference between VAB and Vab. c. Determine the line current (magnitude and angle) flowing into each secondary-phase conductor, the current (magnitude and angle) flowing in each primary winding, and the line current (magnitude and angle flowing in each phase of the primary feeder. ine inpur
A three phase bank of three 75-kVA single phase transfogmers steps the three-phase primary feeder voltage from 1247 kV to 208/120 V and is connected as shown below. The three-phase bank is supplying a thrée-phase wye-connected induction rhotor load operating at 0.75_power factor, 90 kW Tagging output power and 80% efficiency. a. Draw two phasor diagrams for the primary and secondary voltages. b. Determine the phase difference between VAB and Vab. c. Determine the line current (magnitude and angle) flowing into each secondary-phase conductor, the current (magnitude and angle) flowing in each primary winding, and the line current (magnitude and angle flowing in each phase of the primary feeder. ine inpur
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Transcribed Image Text:A three phase bank of three 75-kVA single phase transfogmers steps down
the three-phase primary feeder voltage from 1247 kV to 208/120 V and is
connected as shown below. The three-phase bank is supplying a thrée-phase
wye-connected induction hotor load operating at 0.75_power factor, 90 kW
output power and 80% efficiency.
a. Draw two phasor diagrams for the primary and secondary voltages.
b. Determine the phase difference between VAB and Vab.
c. Determine the line current (magnitude and angle) flowing into each
secondary-phase conductor, the current (magnitude and angle)
Q7.
ne toline?Piimal
phose
lag
Togging
flowing in each primary winding, and the line current (magnitude and
angle flowing in each phase of the primary feeder. ine inpur
ve
3Ø, 12.47 kV, 3 wires
A
B
3Ø, 208/120 V, 4 wires
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