Answered: The infinite bus in Figure-2 shown…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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The infinite bus in Figure-2 shown below operates at 480V. Load 1 is an induction motor consuming 92 kW at 0.78 PF lagging, load 2 is an induction motor consuming 172 kW at 0.8 PF lagging, Load 3 is a synchronous motor whose real power consumption is 122 kW and Load 4 is a synchronous motor whose real power consumption is 42 kW. If the both synchronous motors are adjusted to operate at 0.85 PF lagging, Compute the transmission line current in this system? If the first synchronous motor (150 kW) is adjusted to operate at 0.85 PF leading and other operate at 0.85 Lagging PF Compute the transmission line current in this system? If both synchronous motors are adjusted to operate at 0.85 PF leading Compute the transmission line current in this system? Assume that the transmission line losses are given by line loss where LL stands for line losses. Compare the transmission losses in the three cases?

Ukw
0.78 PF
lagging
Ind.
motor
P2
VkW
0.8 PF
Ind.
Infinite bus
Transmission line
motor
lagging
Synchr.
Wkw
motor / PF = ?
Plant
P4
Synchr.
XkW
PF = ?
motor
Q4
Figure 2

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