1. For Figure 1: The 34 source on the left delivers power to a 30 load via conductors with an impedance of (6+j8) per line. The magnitude of the line-to-line voltages at the source side and at the load side are 120 and 110 kV, respectively. If the power factor of the load is 0.90 lagging, determine (a) the currents (magnitude and angle) and voltages (magnitude and angle) of the 30 load. (Hint: Voltage at the source side and the load side have given magnitude but different angles. Assume the load is Y-connected and use its Van as the reference.) II. For Figure 2: The 3-phase load is connected to a balanced 2300V, abc source. In doing this, 3 conductors are used with the conductors having an impedance of Z₁ = 0.5+j2 ohms each. After connection, the load receives 120 kVA at 0.6 power factor lagging. Determine the line currents. (Hint: Assume the load is Y-connected and use single-line representation.)

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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120 kV
Fig. 1
m
wzm
man
Z= 6 + j8 2
110 kV
Balanced
3-phase
load
Zim
ZL
b. w m
ZL
a
LOAD:
120 kVA
0.6 pf
lagging
1. For Figure 1: The 30 source on the left delivers power to a 3o load via conductors with an impedance of (6+j8)
per line. The magnitude of the line-to-line voltages at the source side and at the load side are 120 and 110
kV, respectively. If the power factor of the load is 0.90 lagging, determine (a) the currents (magnitude and
angle) and voltages (magnitude and angle) of the 30 load. (Hint: Voltage at the source side and the load side
have given magnitude but different angles. Assume the load is Y-connected and use its Van as the reference.)
II. For Figure 2: The 3-phase load is connected to a balanced 2300V, abc source. In doing this, 3 conductors are
used with the conductors having an impedance of Z₁ = 0.5 + j2 ohms each. After connection, the load receives
120 kVA at 0.6 power factor lagging. Determine the line currents. (Hint: Assume the load is Y-connected and
use single-line representation.)
Transcribed Image Text:120 kV Fig. 1 m wzm man Z= 6 + j8 2 110 kV Balanced 3-phase load Zim ZL b. w m ZL a LOAD: 120 kVA 0.6 pf lagging 1. For Figure 1: The 30 source on the left delivers power to a 3o load via conductors with an impedance of (6+j8) per line. The magnitude of the line-to-line voltages at the source side and at the load side are 120 and 110 kV, respectively. If the power factor of the load is 0.90 lagging, determine (a) the currents (magnitude and angle) and voltages (magnitude and angle) of the 30 load. (Hint: Voltage at the source side and the load side have given magnitude but different angles. Assume the load is Y-connected and use its Van as the reference.) II. For Figure 2: The 3-phase load is connected to a balanced 2300V, abc source. In doing this, 3 conductors are used with the conductors having an impedance of Z₁ = 0.5 + j2 ohms each. After connection, the load receives 120 kVA at 0.6 power factor lagging. Determine the line currents. (Hint: Assume the load is Y-connected and use single-line representation.)
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