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+// Example 7.7
+// Calculating Line Voltage
+V_a_m=15*10^3;// Volts
+phase_a=90; // Degree
+V_l=sqrt(3)*V_a_m; // The RMS line voltage
+// From figure 7.19(c)
+phase_ab=phase_a+30;
+phase_bc=phase_ab-120;
+phase_ca=phase_ab+120;
+V_peak=sqrt(2)*V_l; // converting RMS value to peak value
+// for omega= 10;
+omega=100;
+t=0:1:50;
+v_ab=V_peak*cos(omega*t+phase_ab);
+v_bc=V_peak*cos(omega*t+phase_bc);
+v_ca=V_peak*cos(omega*t+phase_ca);
+plot(t,v_ab,'-r',t,v_bc,'-g',t,v_ca,'-y');
+xlabel('t');
+ylabel('v(t)');
+title('Voltage Waveform');
+h1=legend(['v_ab';'v_bc';'v_ca']);