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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 1: SYMMETRICAL SHORT CIRCUIT CAPACITY CALCULATIONS
// EXAMPLE : 1.8 :
// Page number 472
clear ; clc ; close ; // Clear the work space and console
// Given data
X_d_st = 0.2 // Sub-transient reactance(p.u)
X_d_t = 0.4 // Transient reactance(p.u)
X_d = 1.0 // Direct axis reactance(p.u)
I_pu = 1.0 // Load current(p.u)
PF = 0.80 // Lagging power factor
// Calculations
V = 1.0 // Terminal voltage(p.u)
sin_phi = (1-PF**2)**0.5
I = I_pu*(PF-%i*sin_phi) // Load current(p.u)
E_st = V+%i*I*X_d_st // Voltage behind sub-transient reactance(p.u)
E_t = V+%i*I*X_d_t // Voltage behind transient reactance(p.u)
E = V+%i*I*X_d // Voltage behind direct axis reactance(p.u)
// Results
disp("PART III - EXAMPLE : 1.8 : SOLUTION :-")
printf("\nVoltage behind sub-transient reactance = %.2f∠%.2f° p.u", abs(E_st),phasemag(E_st))
printf("\nVoltage behind transient reactance = %.2f∠%.2f° p.u", abs(E_t),phasemag(E_t))
printf("\nVoltage behind direct axis reactance, E = %.2f∠%.2f° p.u", abs(E),phasemag(E))
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