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
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter9: Components For Electric Motors
Section: Chapter Questions
Problem 12RQ
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?
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