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// Example 5.21
// Computation of Inductance and voltage rating of each series connected
// inductor required to limit the starting current to approximately 2*Irated.
// Page No. 236
clc;
clear all;
close;
// Given data
KVA=6.7; // Average locked rotor KVA/hp
hp=7.5; // Motor horsepower
Vline=208; // Line voltage
I=48; // Total current
Rlr=0.294; // Locked rotor resistance
Xlr=0.809; // Locked rotor impedance
f=60; // Frequency of motor
// Corresponding approximate load current
Ilr=KVA*1000*hp/(sqrt(3)*Vline);
Vphase=Vline/sqrt(3); // Voltage/phase
// Applying ohm's law to one phase
Zlr=Vphase/Ilr; // Impedance
Xex=sqrt((Vphase^2/I^2)-(Rlr^2))-Xlr;
L=Xex/(2*%pi*f);
L=L*10^03;
VXl=I*Xex;
// Display result on command window
printf("\n The inductance of each series connected inductor = %0.2f mH ",L);
printf("\n The voltage rating of each series connected inductor = %0.1f V ",VXl);
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