Consider the system shown below: Bus 2 600 VRMS M PV Panels Inverter Bus 1 23:1 1:46 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: Motor 1 80 hp M Motor 2 80 hp M Motor 3 80 hp M Motor 4 80 hp 100 90 80 70 60 50 40 30 20 10 Efficiency (%) 0 0 20 40 60 80 100 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: pf (lagging) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 Motor Loading (%) 80 100

EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN:9781337516549
Author:Simmons
Publisher:Simmons
Chapter19: Special-purpose Outlets-water Pump, Water Heater
Section19.1: Water Pump And Branch Circuit
Problem 21R: Fill in the data for a 16-ampere electric motor, single-phase, no Code letters. a. Branch-circuit...
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Please answer all the questions

 a) What is the minimum required transformer rating for each transformer in kVA? 
b) Find the voltage required at Bus 1.  
c) The loadcentre is to be powered by PV panels that have the same I-V curve (ISC = 
120 A, VOC = 60 V). Identify the configuration that uses the minimum number of 
panels to provide enough power to Bus 1. You can assume that the inverter converts 
the power at 95% efficiency and requires V DC input to generate the same VRMS AC 
output.

Consider the system shown below:
Bus 2
600 VRMS
M
PV Panels
Inverter
Bus 1
23:1
1:46
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:
Motor 1
80 hp
M
Motor 2
80 hp
M
Motor 3
80 hp
M
Motor 4
80 hp
Transcribed Image Text:Consider the system shown below: Bus 2 600 VRMS M PV Panels Inverter Bus 1 23:1 1:46 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: Motor 1 80 hp M Motor 2 80 hp M Motor 3 80 hp M Motor 4 80 hp
100
90
80
70
60
50
40
30
20
10
Efficiency (%)
0
0
20
40
60
80
100
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:
pf (lagging)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
20
40
60
Motor Loading (%)
80
100
Transcribed Image Text:100 90 80 70 60 50 40 30 20 10 Efficiency (%) 0 0 20 40 60 80 100 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: pf (lagging) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 Motor Loading (%) 80 100
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