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+// ELECTRIC POWER TRANSMISSION SYSTEM ENGINEERING ANALYSIS AND DESIGN
+// TURAN GONEN
+// CRC PRESS
+// SECOND EDITION
+
+// CHAPTER : 4 : OVERHEAD POWER TRANSMISSION
+
+// EXAMPLE : 4.9 :
+clear ; clc ; close ; // Clear the work space and console
+
+// GIVEN DATA
+L = 2.60 * 10^-3 ; // Inductance of line in H/mi
+R = 0.1858 ; // Resistance of line in Ω/mi
+C = 0.012 * 10^-6 ; // Capacitance in F/mi
+kV = 138 ; // Transmission line voltage in kV
+Z_c1 = 469.60085 // Characteristic impedance of line in Ω . Obtained from example 4.6
+
+// CALCULATIONS
+Z_c = sqrt(L/C) ; // Approximate value of surge Impedance of line in ohm
+SIL =  kV^2/Z_c ; // Approximate Surge impedance loading in MW
+SIL1 = kV^2/Z_c1 ; // Exact value of SIL in MW
+
+// DISPLAY RESULTS
+disp("EXAMPLE : 4.9 : SOLUTION :-") ;
+printf("\n Approximate value of SIL of transmission line , SIL_app = %.3f MW\n",SIL) ;
+printf("\n Exact value of SIL of transmission line , SIL_exact = %.3f MW\n",SIL1) ;