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//Electric Power Generation, Transmission and Distribution by S.N.Singh
//Publisher:PHI Learning Private Limited
//Year: 2012 ; Edition - 2
//Example 4.4
//Scilab Version : 6.0.0 ; OS : Windows
clc;
clear;
P=20; //Load in kW
pf1=0.8; //Actual Power factor
pf2=0.95; //Required Power factor
phi1=acos(pf1); //Actual Power factor angle in degree
phi2=acos(pf2); //Required Power factor angle in degree
S1=P/pf1; //Actual Apparent Power in kVA
S2=P/pf2; //Modified Apparent Power in kVA
C_VAR=S1*sin(phi1)-S2*sin(phi2); //Required rating of the Capacitor in kVAR
phi3=acos(0.1); //Power factor Angle of Phase Advancing device in degree
alpha=phi1-phi2; //Angle in degree
Beta=%pi/2-acos(0.1)+%pi-(phi1+%pi/2); //Angle in degree
del=%pi-(Beta+alpha); //Angle in degree
ph_adv_KVA=S1*sin(alpha)/sin(del); //Apparent Power of the Phase advancing device in kVA
printf("\nThe rating of capacitor to raise the power factor to 0.95 lagging is %.2f kVAR",C_VAR);
printf("\nThe rating of the phase advancing device is %.2f kVA",ph_adv_KVA);
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