pf (lagging) Efficiency (%) 110 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 Motor Loading (%) The relationship between % of full load for each motor and power factor (they are all the same) is given by the graph below: 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 120 Motor Loading (%) и 27.9 kVRMS 400 VRMS M M M Motor 1 80 hp Motor 2 80 hp Motor 3 80 hp
pf (lagging) Efficiency (%) 110 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 Motor Loading (%) The relationship between % of full load for each motor and power factor (they are all the same) is given by the graph below: 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 120 Motor Loading (%) и 27.9 kVRMS 400 VRMS M M M Motor 1 80 hp Motor 2 80 hp Motor 3 80 hp
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...
Related questions
Question
Each motor is rated at 80 hp but is only loaded
Motor # % Loading
1 40
2 50
3 70
The relationship between % of full load for each motor and efficiency (they are all
the same) is given by the graph below:
a) What is the minimum required transformer rating in kVA?
b) By what percentage could the required transformer rating be reduced if a
capacitor bank were installed in parallel with the motors, improving the power
factor of the loadcentre to unity?
Transcribed Image Text:pf (lagging)
Efficiency (%)
110
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30
40 50 60 70 80 90 100 110
Motor Loading (%)
The relationship between % of full load for each motor and power factor (they are
all the same) is given by the graph below:
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
20
40
60
80
100
120
Motor Loading (%)
Transcribed Image Text:и
27.9 kVRMS
400 VRMS
M
M
M
Motor 1
80 hp
Motor 2
80 hp
Motor 3
80 hp
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