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:
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.6P
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