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+// Example2_29_pg130.sce
+// Positive and negative sequence voltages
+// Theory of Alternating Current Machinery by Alexander Langsdorf
+// First Edition 1999, Thirty Second reprint
+// Tata McGraw Hill Publishing Company
+// Example in Page 130
+
+
+clear; clc; close;
+
+// Given data
+
+V_1 = 1000 + %i*50;
+V_2 = -800 + %i*100;
+V_3 = -200 - %i*150;
+a = cos(2*%pi/3) + %i*sin(2*%pi/3);
+
+// Calculations
+
+disp('According to Equations 2-88 and 2-89 in page 130');
+V_1p = (V_1 + V_2*a + V_3*a^2)/3;
+V_1n = (V_1 + V_2*a^(-1) + V_3*a^(-2))/3;
+
+printf("\n\nPositive sequence voltage is = %0.4f /_ %0.2f Volts \nNegative sequence voltage is = %0.4f /_ %0.2f Volts\n", abs(V_1p),atan(imag(V_1p)/real(V_1p))*180/%pi, abs(V_1n),atan(imag(V_1n)/real(V_1n))*180/%pi);
+
+// Result
+//  According to Equations 2-88 and 2-89 in page 130   
+//
+//
+// Positive sequence voltage is = 452.7740 /_ -19.11 Volts 
+// Negative sequence voltage is = 605.5265 /_ 19.11 Volts