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diff --git a/3472/CH27/EX27.5/Example27_5.sce b/3472/CH27/EX27.5/Example27_5.sce new file mode 100644 index 000000000..f48af78f8 --- /dev/null +++ b/3472/CH27/EX27.5/Example27_5.sce @@ -0,0 +1,81 @@ +// 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 : 1.5 :
+// Page number 470-471
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+MVA_G1 = 100.0 // Generator rating(MVA)
+X_G1 = 30.0 // Reactance of generator(%)
+MVA_G2 = 150.0 // Generator rating(MVA)
+X_G2 = 20.0 // Reactance of generator(%)
+MVA_G3 = 200.0 // Generator rating(MVA)
+X_G3 = 15.0 // Reactance of generator(%)
+MVA_T1 = 150.0 // Transformer rating(MVA)
+X_T1 = 10.0 // Reactance of transformer(%)
+MVA_T2 = 175.0 // Transformer rating(MVA)
+X_T2 = 8.0 // Reactance of transformer(%)
+MVA_T3 = 200.0 // Transformer rating(MVA)
+X_T3 = 6.0 // Reactance of transformer(%)
+MVA_T4 = 100.0 // Transformer rating(MVA)
+X_T4 = 5.0 // Reactance of transformer(%)
+MVA_T5 = 150.0 // Transformer rating(MVA)
+X_T5 = 5.0 // Reactance of transformer(%)
+Z_L1 = complex(0.5,1.0) // Line impedance(ohm/km)
+L1 = 100.0 // Line length(km)
+Z_L2 = complex(0.4,1.2) // Line impedance(ohm/km)
+L2 = 50.0 // Line length(km)
+Z_L3 = complex(0.4,1.2) // Line impedance(ohm/km)
+L3 = 50.0 // Line length(km)
+Z_L4 = complex(0.3,1.0) // Line impedance(ohm/km)
+L4 = 60.0 // Line length(km)
+kV_L1 = 220.0 // Voltage towards line(kV)
+kV_L2 = 220.0 // Voltage towards line(kV)
+kV_L3 = 132.0 // Voltage towards line(kV)
+kV_L4 = 132.0 // Voltage towards line(kV)
+
+// Calculations
+MVA_base = 200.0 // Base rating(MVA)
+X_d_G1 = (MVA_base/MVA_G1)*(X_G1/100) // Reactance of generator(p.u)
+X_d_G2 = (MVA_base/MVA_G2)*(X_G2/100) // Reactance of generator(p.u)
+X_d_G3 = (MVA_base/MVA_G3)*(X_G3/100) // Reactance of generator(p.u)
+X_T_1 = (MVA_base/MVA_T1)*(X_T1/100) // Reactance of transformer(p.u)
+X_T_2 = (MVA_base/MVA_T2)*(X_T2/100) // Reactance of transformer(p.u)
+X_T_3 = (MVA_base/MVA_T3)*(X_T3/100) // Reactance of transformer(p.u)
+X_T_4 = (MVA_base/MVA_T4)*(X_T4/100) // Reactance of transformer(p.u)
+X_T_5 = (MVA_base/MVA_T5)*(X_T5/100) // Reactance of transformer(p.u)
+Z_L1_base = kV_L1**2/MVA_base // L1 base impedance(ohm)
+Z_L_1 = Z_L1*L1/Z_L1_base // Line impedance(p.u)
+Z_L2_base = kV_L2**2/MVA_base // L2 base impedance(ohm)
+Z_L_2 = Z_L2*L2/Z_L2_base // Line impedance(p.u)
+Z_L3_base = kV_L3**2/MVA_base // L3 base impedance(ohm)
+Z_L_3 = Z_L3*L3/Z_L3_base // Line impedance(p.u)
+Z_L4_base = kV_L4**2/MVA_base // L4 base impedance(ohm)
+Z_L_4 = Z_L4*L4/Z_L4_base // Line impedance(p.u)
+
+// Results
+disp("PART III - EXAMPLE : 1.5 : SOLUTION :-")
+printf("\np.u values of the single line diagram are as below")
+printf("\nGenerators p.u reactances :")
+printf("\n X_d_G1 = %.1f p.u", X_d_G1)
+printf("\n X_d_G2 = %.3f p.u", X_d_G2)
+printf("\n X_d_G3 = %.2f p.u", X_d_G3)
+printf("\nTransformers p.u reactances :")
+printf("\n X_T1 = %.3f p.u", X_T_1)
+printf("\n X_T2 = %.4f p.u", X_T_2)
+printf("\n X_T3 = %.2f p.u", X_T_3)
+printf("\n X_T4 = %.1f p.u", X_T_4)
+printf("\n X_T5 = %.3f p.u", X_T_5)
+printf("\nLines p.u impedances :")
+printf("\n Z_L1 = (%.3f + %.3fj) p.u", real(Z_L_1),imag(Z_L_1))
+printf("\n Z_L2 = (%.3f + %.3fj) p.u", real(Z_L_2),imag(Z_L_2))
+printf("\n Z_L3 = (%.3f + %.3fj) p.u", real(Z_L_3),imag(Z_L_3))
+printf("\n Z_L4 = (%.3f + %.3fj) p.u \n", real(Z_L_4),imag(Z_L_4))
+printf("\nNOTE: ERROR: (1). Reactance of T2 is 8 percent & not 1 percent as mentioned in the textbook problem statement")
+printf("\n (2). Several calculation mistakes in the textbook")
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