{

 "metadata": {

  "name": "",

  "signature": "sha256:e4b81aad84d58dd6a5380406939aae9ead38ccfe59091c46f280bef86ba6a2d7"

 },

 "nbformat": 3,

 "nbformat_minor": 0,

 "worksheets": [

  {

   "cells": [

    {

     "cell_type": "heading",

     "level": 1,

     "metadata": {},

     "source": [

      "Chapter15:POWER SYSTEMS"

     ]

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.1:pg-207"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "V1=250\n",

      "V2=480\n",

      "Vol2_by_Vol1=V1/V2\n",

      "\n",

      "sav=(1-Vol2_by_Vol1)*100\n",

      "print(sav)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": [

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "100\n"

       ]

      }

     ],

     "prompt_number": 2

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.2:pg-207"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "P=5E6\n",

      "pf=0.85\n",

      "V=33000\n",

      "l=50000\n",

      "rho=3E-8\n",

      "Pt=P*pf\n",

      "Pl=Pt*0.1\n",

      "I=P/V\n",

      "A1=2*I*I*rho*l/Pl\n",

      "Vol1=2*l*A1\n",

      "print(Vol1)\n",

      "Il=P/sqrt(3)/V\n",

      "A2=3*Il*Il*rho*l/Pl\n",

      "Vol2=3*l*A2\n",

      "print(Vol2)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": []

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.3:pg-208"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "import math\n",

      "f=50\n",

      "w=2*math.pi*f\n",

      "I=0.8\n",

      "V=220\n",

      "P=75\n",

      "phi=math.acos(P/V/I)\n",

      "\n",

      "phi_new=math.acos(0.9)\n",

      "Ic=I*cos(phi)*(tan(phi)-tan(phi_new))\n",

      "C=Ic/V/w\n",

      "print\"C=\",round(C,8)\n",

      "\n",

      "phi_new=math.acos(1)\n",

      "Ic=I*cos(phi)*(tan(phi)-tan(phi_new))\n",

      "C=Ic/V/w\n",

      "print\"C=\",round(C,8)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": [

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "C= 1.157e-05\n",

        "C= 1.157e-05\n"

       ]

      }

     ],

     "prompt_number": 7

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.4:pg-208"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "import math\n",

      "Cond_cost=100\n",

      "charge=60\n",

      "phi2=math.asin(0.1*Cond_cost/charge)\n",

      "pf=cos(phi2)\n",

      "print(pf)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": [

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "0.986013297183\n"

       ]

      }

     ],

     "prompt_number": 8

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.5:pg-209"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "\n",

      "Oc=400000\n",

      "pf1=0.8\n",

      "phi1=math.acos(pf1)\n",

      "ab=Oc/cos(phi1)*sin(phi1)\n",

      "pf2=0.25\n",

      "phi3=math.acos(pf2)\n",

      "pf2=0.484\n",

      "\n",

      "gammaa=(ab-pf2*Oc)/(pf2*cos(phi3)+sin(phi3))\n",

      "print(gammaa)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": [

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "97682.2645812\n"

       ]

      }

     ],

     "prompt_number": 9

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.6:pg-209"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "f=50\n",

      "w=2*math.pi*f\n",

      "P=2E6\n",

      "V=11000\n",

      "pf=0.8\n",

      "phi=math.acos(pf)\n",

      "Xl=10\n",

      "IR=P/sqrt(3)/V/pf\n",

      "Vr=V/sqrt(3)\n",

      "Vs=Vr+IR*Xl*sin(phi)\n",

      "Vsll=Vs*sqrt(3)\n",

      "print(Vsll)\n",

      "VR=Vsll/V-1\n",

      "print(VR)\n",

      "\n",

      "pf=1\n",

      "print(pf)\n",

      "Qc=P*tan(phi)\n",

      "C=Qc/V/V/w\n",

      "print(C)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": [

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "12363.6363636\n",

        "0.123966942149\n",

        "1\n",

        "3.94599032459e-05\n"

       ]

      }

     ],

     "prompt_number": 10

    },

    {

     "cell_type": "heading",

     "level": 2,

     "metadata": {},

     "source": [

      "Ex15.7:pg-210"

     ]

    },

    {

     "cell_type": "code",

     "collapsed": false,

     "input": [

      "f=50\n",

      "w=2*math.pi*f\n",

      "V=33000\n",

      "Vr=V/sqrt(3)\n",

      "P=24E6/3\n",

      "pf=0.8\n",

      "phi=math.acos(pf)\n",

      "Ia=P/Vr/pf\n",

      "Rl=4.0\n",

      "Xl=20\n",

      "Vs=Vr+Ia*(Xl*sin(phi)+Rl*cos(phi))\n",

      "Vsll=sqrt(3)*Vs\n",

      "VR=Vsll/V-1\n",

      "print(Vsll)\n",

      "Ia=Ia*exp(-1j*phi)\n",

      "print(norm(Ia))\n",

      "\n",

      "phi1=math.atan(-Rl/Xl)\n",

      "pf=cos(phi1)\n",

      "Ia1=P/Vr/pf\n",

      "Ia1=Ia1*exp(-1j*phi1)   #calculation mistake in the book at this step\n",

      "\n",

      "Ic=Ia1-Ia\n",

      "C=norm(Ic/w/Vr)\n",

      "print(C)\n",

      "\n",

      "LL1=norm(Ia*Ia*Rl)\n",

      "effi1=P/(P+LL1)\n",

      "LL2=norm(Ia1*Ia1*Rl)\n",

      "effi2=P/(P+LL2)\n",

      "print(effi1)\n",

      "print(effi2)\n"

     ],

     "language": "python",

     "metadata": {},

     "outputs": [

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "46818.1818182\n",

        "524.863881081"

       ]

      },

      {

       "output_type": "stream",

       "stream": "stdout",

       "text": [

        "\n",

        "6.66433921487e-05\n",

        "0.878934624697\n",

        "0.916018976481\n"

       ]

      }

     ],

     "prompt_number": 11

    }

   ],

   "metadata": {}

  }

 ]

}