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// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART II : TRANSMISSION AND DISTRIBUTION
// CHAPTER 13: WAVE PROPAGATION ON TRANSMISSION LINES
// EXAMPLE : 13.4 :
// Page number 366
clear ; clc ; close ; // Clear the work space and console
// Given data
R_1 = 60.0 // Surge impedance of underground cable(ohm)
R_2 = 400.0 // Surge impedance of overhead line(ohm)
e = 100.0 // Maximum value of surge(kV)
// Calculations
i = e*1000/R_1 // Current(A)
k = (R_2-R_1)/(R_2+R_1)
e_ref = k*e // Reflected voltage(kV)
e_trans = e+e_ref // Transmitted voltage(kV)
e_trans_alt = (1+k)*e // Transmitted voltage(kV). Alternative method
i_ref = -k*i // Reflected current(A)
i_trans = e_trans*1000/R_2 // Transmitted current(A)
i_trans_alt = (1-k)*i // Transmitted current(A). Alternative method
// Results
disp("PART II - EXAMPLE : 13.4 : SOLUTION :-")
printf("\nReflected voltage at the junction = %.f kV", e_ref)
printf("\nTransmitted voltage at the junction = %.f kV", e_trans)
printf("\nReflected current at the junction = %.f A", i_ref)
printf("\nTransmitted current at the junction = %.f A\n", i_trans)
printf("\nNOTE: ERROR: Calculation mistake in textbook in finding Reflected current")
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