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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 pf (lagging) 0.6 0.5 0.4 G Ş 3 * སྟྲ ཊྛ ° 0.3 0.2 0 0 20 40 60 80 100 120 Motor Loading (%) 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? Problem 4: Question 1. Consider the three-phase loadcentre shown below: 27.9 kVRMS 400 VRMS M M M Motor 2 80 hp Motor 3 80 hp Motor 1 80 hp Each motor is rated at 80 hp but is only loaded mechanically as follows: 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:

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 pf (lagging) 0.6 0.5 0.4 G Ş 3 * སྟྲ ཊྛ ° 0.3 0.2 0 0 20 40 60 80 100 120 Motor Loading (%) 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? Problem 4: Question 1. Consider the three-phase loadcentre shown below: 27.9 kVRMS 400 VRMS M M M Motor 2 80 hp Motor 3 80 hp Motor 1 80 hp Each motor is rated at 80 hp but is only loaded mechanically as follows: 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:

Introductory Circuit Analysis (13th Edition)
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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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 pf (lagging) 0.6 0.5 0.4 G Ş 3 * སྟྲ ཊྛ ° 0.3 0.2 0 0 20 40 60 80 100 120 Motor Loading (%) 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: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 pf (lagging) 0.6 0.5 0.4 G Ş 3 * སྟྲ ཊྛ ° 0.3 0.2 0 0 20 40 60 80 100 120 Motor Loading (%) 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?
Problem 4: Question 1. Consider the three-phase loadcentre shown below: 27.9 kVRMS 400 VRMS M M M Motor 2 80 hp Motor 3 80 hp Motor 1 80 hp Each motor is rated at 80 hp but is only loaded mechanically as follows: 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:
Transcribed Image Text:Problem 4: Question 1. Consider the three-phase loadcentre shown below: 27.9 kVRMS 400 VRMS M M M Motor 2 80 hp Motor 3 80 hp Motor 1 80 hp Each motor is rated at 80 hp but is only loaded mechanically as follows: 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:
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