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//===========================================================================
//chapter 7 example 22
clc;
clear all;
//variable declaration
W1 = 5000; //wattmeter reading in W
W2 = -1000; //wattmeter reading in W
VL = 440; //load voltage in V
f = 50; //frequency in Hz
VP = 440;
//calculations
P = W1+W2; //total power in the load circuit in W
phi = atan(((W1-W2)/(W1+W2))*sqrt(3)); //phase angle in °
phi1 = phi*180/%pi;
pf = cos(phi); //power factor
IP = P/((sqrt(3)*VL*pf)); //load current per phase in A
IP1 = IP/sqrt(3);
ZP = VP/IP1; //load impedance per phase
RP = ZP*pf; //load resistance per phase in Ω
XP =ZP*sin(phi); //load reactance per phase in Ω
pf1 = 0.5; //power factor
phi2 = (acos(pf1))*180/%pi;
//reading of wattmeter will be zero
XP1 = RP*tan((phi2)*%pi/180); //reactnace in circuit per phase in Ω
XC =XP-XP1; //value of capacitive reactance in troduced in each phase in Ω
C = 1/(2*%pi*f*XC); //value of capacitive reactance introduced in each phase of delta connected in uF
//result
mprintf("value of capacitive reactance introduced in each phase of delta connected = %3.0f uF",(C*10^6));
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