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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?

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?

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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Question

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? 

1. Consider the three-phase loadcentre shown below: 13.8 KVRMS 600 VEMS (M (M) (M) M Motor 1 Motor 2 Motor 3 Motor 4 80 hp 80 hp 80 hp 80 hp
Transcribed Image Text:1. Consider the three-phase loadcentre shown below: 13.8 KVRMS 600 VEMS (M (M) (M) M Motor 1 Motor 2 Motor 3 Motor 4 80 hp 80 hp 80 hp 80 hp
Each motor is rated at 80 hp but is only loaded mechanically as follows: Motor # % Loading 1 50 2 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 80 60 40 20 20 40 60 80 100 120 Motor Loading (96) 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 20 40 60 80 100 120 Motor Loading (96) pf (lagging) Eiciency (%)
Transcribed Image Text:Each motor is rated at 80 hp but is only loaded mechanically as follows: Motor # % Loading 1 50 2 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 80 60 40 20 20 40 60 80 100 120 Motor Loading (96) 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 20 40 60 80 100 120 Motor Loading (96) pf (lagging) Eiciency (%)
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