Question 3. A 12-kVA, 480/120V, step-down ideal transformer is operating at its full load with a 70.7% pf lagging. Determine (a) the secondary winding current magnitude and angle, (b) the load impedance seen from the primary (480V) side.

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Question 3. A 12-kVA, 480/120V, step-down ideal transformer is operating at its full load with a
70.7% pf lagging. Determine (a) the secondary winding current magnitude and angle, (b) the load
impedance seen from the primary (480V) side.
Question 4. The following data were taken for a 46-kVA, 230/2300V, 60-Hz transformer:
Voltage (V)
Current (A)
Power (W)
Short-circuit test
160
20
1150
Determine (a) the equivalent winding resistance ReH of the transformer at the high-voltage side,
and (b) the copper loss at 50% load.
ne
47
G
18
e
Transcribed Image Text:esc 1 tab Q Cock A F1 2 IIISI Question 3. A 12-kVA, 480/120V, step-down ideal transformer is operating at its full load with a 70.7% pf lagging. Determine (a) the secondary winding current magnitude and angle, (b) the load impedance seen from the primary (480V) side. Question 4. The following data were taken for a 46-kVA, 230/2300V, 60-Hz transformer: Voltage (V) Current (A) Power (W) Short-circuit test 160 20 1150 Determine (a) the equivalent winding resistance ReH of the transformer at the high-voltage side, and (b) the copper loss at 50% load. ne 47 G 18 e
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