1 files changed, 101 insertions, 0 deletions
diff --git a/Elements_of_Power_system/Chapter_12.ipynb b/Elements_of_Power_system/Chapter_12.ipynb
new file mode 100755
index 00000000..a83c113d
--- /dev/null
+++ b/Elements_of_Power_system/Chapter_12.ipynb
@@ -0,0 +1,101 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:c04662c5bd4f38db1beb13d324aa5f4b0617ec914f453499de17aa02ac050633"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12 - NEUTRAL GROUNDING"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ecample E1 - Pg 311"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate Reactance of coil\n",
+      "#Given data :\n",
+      "import math\n",
+      "f=50.##Supply frequency in Hz\n",
+      "C=4.5*10.**-6##in Farad\n",
+      "Omega_L=1./3./2./math.pi/f/C##in ohm\n",
+      "print '%s %.2f' %(\"Reactance of coil (ohm) :\",Omega_L)#\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Reactance of coil (ohm) : 235.79\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ecample E2 - Pg 311"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate Necessary Inductance of peterson coil,Rating of supressor coil in MVA\n",
+      "#Given data :\n",
+      "import math\n",
+      "V=132.*1000.##V\n",
+      "f=50.##Hz\n",
+      "r=10./1000.##m\n",
+      "d1=4.##m\n",
+      "d2=4.##m\n",
+      "d3=d1+d2##m\n",
+      "epsilon_o=8.854*10.**-12##constant\n",
+      "l_tl=192.*1000.##length of transmission line in m\n",
+      "C=2.*math.pi*epsilon_o/math.log((d1*d2*d3)**(1./3.)/r)*l_tl##in Farad\n",
+      "L=1./3./(2.*math.pi*f)**2./C##H\n",
+      "print '%s %.3f' %(\"Necessary Inductance of peterson coil in H : \",L)#\n",
+      "VP=V/math.sqrt(3.)##V\n",
+      "IL=VP/(2.*math.pi*f)/L##A\n",
+      "Rating=VP*IL/1000.##kVA\n",
+      "print '%s %.2f' %(\"Rating of supressor coil in MVA :\",Rating/1000)#\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Necessary Inductance of peterson coil in H :  1.968\n",
+        "Rating of supressor coil in MVA : 9.40\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file