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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 6: CIRCUIT BREAKER
// EXAMPLE : 6.3 :
// Page number 545-546
clear ; clc ; close ; // Clear the work space and console
// Given data
kV = 132.0 // Voltage(kV)
pf = 0.3 // Power factor of the fault
K3 = 0.95 // Recovery voltage was 0.95 of full line value
f_n = 16000.0 // Natural frequency of the restriking transient(Hz)
// Calculations
kV_phase = kV/3**0.5 // System voltage(kV)
sin_phi = sind(acosd(pf)) // Sinφ
K2 = 1.0
v = K2*K3*kV/3**0.5*2**0.5*sin_phi // Active recovery voltage(kV)
V_max_restrike = 2*v // Maximum restriking voltage(kV)
t = 1.0/(2.0*f_n) // Time(sec)
RRRV = V_max_restrike/(t*10**6) // Rate of rise of restriking voltage(kV/µ-sec)
// Results
disp("PART III - EXAMPLE : 6.3 : SOLUTION :-")
printf("\nRate of rise of restriking voltage, R.R.R.V = %.2f kV/µ-sec", RRRV)
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