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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 8: PROTECTION OF ALTERNATORS AND AC MOTORS
// EXAMPLE : 8.1 :
// Page number 624
clear ; clc ; close ; // Clear the work space and console
// Given data
V = 6600.0 // Alternator Voltage(V)
P = 2000.0*10**3 // Rating of alternator(W)
PF = 0.8 // Power factor of alternator
X = 12.5 // Alternator reactance(%)
I = 200.0 // Current protection(A)
per = 10.0 // Percentage of winding unprotected(%)
// Calculations
I_fl = P/(3**0.5*V*PF) // Full load current of alternator(A)
x = X*V/(3**0.5*100*I_fl) // Reactance per phase of alternator(ohm)
x_per = per/100*x // Reactance of 10% of the winding(ohm)
NA = V/(3**0.5*per) // Voltage induced in winding(V)
r = ((NA/I)**2-x_per**2)**0.5 // Neutral earthing reactance(ohm)
// Results
disp("PART III - EXAMPLE : 8.1 : SOLUTION :-")
printf("\nNeutral earthing reactance, r = %.2f ohm", r)
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