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? Each motor is rated at 80 hp but is only loaded mechanically as follows:Motor #% Loading15070320490The relationship between % of full load for each motor and efficiency (they are allthe same) is given by the graph below:120100604020204060BU100120Motor Loading (%)The relationship between % of full load for cach motor and power factor (they areall the same) is given by the graph below:0.70.60.50.40.30.20.12040600100120Motor Loading (%)pf (lagging)Efficiency (%) 13.8 KVRMS600 VRMSMM(M)MMotor 1Motor 2Motor 480 hpMotor 380 hp80 hp80 hp

The motor is connected as Data are given as:

Answered: a) What is the minimum required…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

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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?

Each motor is rated at 80 hp but is only loaded mechanically as follows:
Motor #
% Loading
1
50
70
3
20
4
90
The relationship between % of full load for each motor and efficiency (they are all
the same) is given by the graph below:
120
100
60
40
20
20
40
60
BU
100
120
Motor Loading (%)
The relationship between % of full load for cach motor and power factor (they are
all the same) is given by the graph below:
0.7
0.6
0.5
0.4
0.3
0.2
0.1
20
40
60
0
100
120
Motor Loading (%)
pf (lagging)
Efficiency (%)

13.8 KVRMS
600 VRMS
M
M
(M)
M
Motor 1
Motor 2
Motor 4
80 hp
Motor 3
80 hp
80 hp
80 hp

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