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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 III : SWITCHGEAR AND PROTECTION
// CHAPTER 7: PROTECTIVE RELAYS
// EXAMPLE : 7.2 :
// Page number 596
clear ; clc ; close ; // Clear the work space and console
// Given data
ratio = 525.0/1 // CT ratio
CT_sec = 1.0 // Secondary turn
t_mult = 0.3 // Time multiplier setting
I_f = 5250.0 // Fault current(A)
// Calculations
I_sec_fault = I_f/ratio // Secondary fault current(A)
PSM = I_sec_fault/(1.25*CT_sec) // Plug setting multiplier
t = 3.15 // Time against this PSM(sec). From graph E7.1 in textbook page no 595
time_oper = t*t_mult // Operating time(sec)
// Results
disp("PART III - EXAMPLE : 7.2 : SOLUTION :-")
printf("\nTime of operation of the relay = %.3f sec", time_oper)
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