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-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:74ef32d0e67f3d77b60188556b39e6627674afc8f6e4feb1b0bbc3ae8dbaee2a"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 21: Protective Relays"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 3,
-     "metadata": {},
-     "source": [
-      "Example 21.1, Page Number: 507"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "from __future__ import division\n",
-      "\n",
-      "#Variable declaration:\n",
-      "Is = 5                           #rated secondary current of C.T\n",
-      "CS = 1.25                        #current setting\n",
-      "TSM = 0.6                        #time setting multiplier\n",
-      "IF = 4000                        #fault current(A)\n",
-      "CR = 400/5                       #current ratio of CT\n",
-      "\n",
-      "#Calculation:\n",
-      "Ipc = Is*CS                     #pick-up current(A)\n",
-      "If = IF*CR                      #Fault current in relay coil(A)\n",
-      "PSM = If/Ipc                    #plug setting multiplier\n",
-      "#Corresponding to the plug-setting multiplier of 8 given in fig.21.16,\n",
-      "#the time of operation is 3.5 seconds.\n",
-      "top = 3.5*TSM                   #Actual relay operating time(s)\n",
-      "\n",
-      "\n",
-      "#Result:\n",
-      "print \"The relay operating time is\",top,\"seconds\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The relay operating time is 2.1 seconds\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file