2 files changed, 76 insertions, 0 deletions
diff --git a/14/CH4/EX4.2/example_4_2.sce b/14/CH4/EX4.2/example_4_2.sce
new file mode 100755
index 000000000..9cb903f93
--- /dev/null
+++ b/14/CH4/EX4.2/example_4_2.sce
@@ -0,0 +1,45 @@
+//Chapter 4
+//Example 4.2
+//ChargingMVA
+//Page 80
+clear;clc;
+
+//Given values
+D_12 = 20;//in ft
+D_23 = D_12;
+D_31 = 38;//in ft
+f = 60;//in Hz
+V = 220e3;//in volts
+l = 175;//in mi
+k = 8.85e-12;//permittivity in F/m
+//From tables A.1 and A.3
+d = 1.108;//in inches
+X_a1 = 0.0912e6;//in ohm mi
+X_d1 = 0.0952e6;//in ohm mi
+
+//Calculations
+r = d / ( 2 * 12);//division by 12 to convert in to ft
+D_eq = (D_12 * D_23 * D_31)^(1/3);
+C_n = (2 * %pi * k)/log(D_eq/r);
+X_c = 1 / (2 * %pi * f * C_n * 1609);//division by 1609 to convert to ohm mi
+
+printf("\n\n Capacitance = %.4fe-12 F/m \n\n",C_n * 1e12)
+printf("\n\n Capacitive reactance = %.4fe6 ohm mi \n\n",X_c / 1e6)
+
+//Calculations From tables
+X_c1 = X_a1 + X_d1;
+
+disp('Using capacitive reactance at 1-ft spacing and spacing factor')
+printf("\n\n Capacitive reactance = %.4fe6 ohm mi \n\n",X_c1 / 1e6)
+
+X_c_l = X_c1 / l;//Capacitive reactance for 175mi
+I_chg = 2 * %pi * f * V * C_n * 1609 / sqrt(3);
+I_chg_l = I_chg * l;
+Q = sqrt(3) * V * I_chg_l;
+
+disp('For a lenght of 175mi')
+printf("\n\n Capacitive reactance = %.4f ohm to neutral \n\n",X_c_l)
+printf("\n\n Charging current per mile = %.3f A/mi \n\n",I_chg)
+disp('For a lenght of 175mi')
+printf("\n\n Charging current = %.0f A \n\n",I_chg_l)
+printf("\n\n Total charging megavolt-amperes = %.1f Mvar \n\n",Q / 1e6)
diff --git a/14/CH4/EX4.2/resultex_4_2.txt b/14/CH4/EX4.2/resultex_4_2.txt
new file mode 100755
index 000000000..7ab4ee6f9
--- /dev/null
+++ b/14/CH4/EX4.2/resultex_4_2.txt
@@ -0,0 +1,31 @@
+ Capacitance = 8.8472e-12 F/m 
+
+
+
+ Capacitive reactance = 0.1863e6 ohm mi 
+
+ 
+ Using capacitive reactance at 1-ft spacing and spacing factor   
+
+
+ Capacitive reactance = 0.1864e6 ohm mi 
+
+ 
+ For a lenght of 175mi   
+
+
+ Capacitive reactance = 1065.1429 ohm to neutral 
+
+
+
+ Charging current per mile = 0.682 A/mi 
+
+ 
+ For a lenght of 175mi   
+
+
+ Charging current = 119 A 
+
+
+
+ Total charging megavolt-amperes = 45.5 Mvar