{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# SAMPLE NOTEBOOK" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "\n", "\n", "\n", "## ch-9 page 227 pb-1" ] }, { "cell_type": "code", "execution_count": 12, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "('load current =', 21.78649237472767)\n", "('design current=', 28.32244008714597)\n", "('Derating factor=', 0.92)\n", "('fuse rating=', 30.785260964289098)\n" ] } ], "source": [ "\n", "from __future__ import division\n", "\n", "import math\n", "\n", "vi=120;\n", "k=1000;\n", "pi=2*k;\n", "eff=0.90;\n", "pf=0.85;\n", "t=65;\n", "\n", "lc=(pi)/(vi*eff*pf);\n", "print('load current =',lc);\n", "\n", "dc=1.3*lc;\n", "print('design current=',dc);\n", "\n", "df=(0.2/100)*(t-25);\n", "df=11.5*df;\n", "print('Derating factor=',df);\n", "\n", "fr=dc/df;\n", "print('fuse rating=',fr);\n" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "\n", "\n", "\n", "## ch-10 page 268 pb-6" ] }, { "cell_type": "code", "execution_count": 13, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "('power delivered =', 500000.0, 'watts')\n", "('power loss=', 10000.0, 'watts')\n", "(510583.1892725521, 241709.44403085182)\n", "('kvar_cap=', 268.87374524170025)\n", "('c=', 10.111669570616154, 'micro farad/ph')\n", "('differences in kva demand=', 158.7301587301588)\n", "('loss in cable =', 0.6049382716049381)\n", "('cost saving=', 5294.849999999999)\n", "('total three phase capacitor cost=', 48397.274143506045, '$')\n", "('capacitor cost will be recoverred in', 9.140442910281887, 'months')\n" ] } ], "source": [ "\n", "from __future__ import division\n", "\n", "import math\n", "\n", "lpf1=0.70;\n", "lpf2=0.90;\n", "vi=460;\n", "f=60;\n", "k=1000;\n", "p=1500*k;\n", "time=300;\n", "cost=60;\n", "l=2/100;\n", "theta1=45.6;\n", "theta2=25.8;\n", "pd=p/3; #since 3 phase;\n", "pl=l*pd;\n", "\n", "print('power delivered =',pd,'watts');\n", "print('power loss=',pl,'watts');\n", "\n", "var1=pd*(math.tan((math.pi/180)*theta1));\n", "var2=pd*(math.tan((math.pi/180)*theta2));\n", "var=var1-var2;\n", "print(var1,var2);\n", "kvar=var/1000;\n", "print('kvar_cap=',kvar);\n", "\n", "vp=vi/(math.sqrt(3));\n", "w=2*math.pi*f;\n", "\n", "c=(1000*kvar)/(w*vp*vp);\n", "c=c*1000;\n", "print('c=',c,'micro farad/ph');\n", "\n", "kva1=(pd/1000)/lpf1;\n", "kva2=(pd/1000)/lpf2;\n", "\n", "dkva=kva1-kva2;\n", "print('differences in kva demand=',dkva);\n", "\n", "loss=(lpf1/lpf2)*(lpf1/lpf2);\n", "print('loss in cable =',loss);\n", "\n", "kvas=3*158.72;\n", "\n", "scl=3*3.95;\n", "\n", "tcost=10*kvas+0.15*scl*time;\n", "print('cost saving=',tcost);\n", "\n", "tccost=cost*3*kvar;\n", "\n", "print('total three phase capacitor cost=',tccost,'$');\n", "\n", "duration=tccost/tcost;\n", "print('capacitor cost will be recoverred in',duration,'months');\n" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "\n", "\n", "\n", "## ch-13 page 340 pb-3" ] }, { "cell_type": "code", "execution_count": 14, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "('duty cycle=', 0.5)\n", "('avg o/p voltage=', 60.0)\n", "('avg o/p current=', 4.0)\n", "('avg o/p power=', 240.0)\n", "('L min=', 3.0, 'mhenry')\n" ] } ], "source": [ "\n", "from __future__ import division\n", "\n", "import math\n", "\n", "v=120;\n", "i=2;\n", "f=1000;\n", "to=(0.5)/1000;\n", "\n", "T=1/f;\n", "\n", "dr=(to)/T;\n", "print('duty cycle=',dr);\n", "\n", "vo=dr*v;\n", "io=i/dr;\n", "po=vo*io;\n", "\n", "print('avg o/p voltage=',vo);\n", "print('avg o/p current=',io);\n", "print('avg o/p power=',po);\n", "\n", "L=(dr*(v/10))/2;\n", "\n", "print('L min=',L,'mhenry');\n" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "\n", "\n", "\n", "## ch-14 page 363 pb-4" ] }, { "cell_type": "code", "execution_count": 15, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "('V dc=', 339.4112549695428)\n", "('I dc=', 5.892556509887896)\n", "('fundamental ac side rms current =', 8.333333333333334)\n", "('THD=', 0.8259394650941436)\n", "('I ac(rms)=', 10.77677544021814)\n", "('I dc(rms)=', 9.023118455759443)\n" ] } ], "source": [ "\n", "from __future__ import division\n", "import math\n", "\n", "v=240;\n", "f=60;\n", "p=2000;\n", "dpf=1;\n", "k1=73.2;k2=36.6;k3=8.1;k4=5.7;\n", "k5=4.1;k6=2.9;k7=0.8;k8=0.4;\n", "h1=3;h2=5;h3=7;h4=9;h5=11;h6=13;h7=17;\n", "\n", "vdc=math.sqrt(2)*v;\n", "\n", "idc=p/vdc;\n", "print('V dc=',vdc);\n", "print('I dc=',idc);\n", "pac=p/dpf;\n", "\n", "\n", "is1=p/v;\n", "\n", "print('fundamental ac side rms current =',is1);\n", "\n", "k=(k1*k1)+k2*k2+k3*k3+k4*k4+k5*k5+k6*k6+k7*k7;\n", "thd=(math.sqrt(k))/100;\n", "print('THD=',thd);\n", "\n", "iac=is1*(math.sqrt(1+(0.82*0.82)));\n", "\n", "idcr=math.sqrt((iac*iac)-(idc*idc));\n", "\n", "print('I ac(rms)=',iac);\n", "print('I dc(rms)=',idcr);\n", "\n" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "\n", "\n", "\n", "## ch-16 page 454 pb-6" ] }, { "cell_type": "code", "execution_count": 16, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "('fundamental load current =', 240.5626121623441)\n" ] } ], "source": [ "\n", "from __future__ import division\n", "import math\n", "\n", "v=480;\n", "k=1000;\n", "p=200*k;\n", "thd=600;\n", "\n", "lc=p/(math.sqrt(3)*v);\n", "\n", "print('fundamental load current =',lc);\n" ] } ], "metadata": { "anaconda-cloud": {}, "kernelspec": { "display_name": "Python [default]", "language": "python", "name": "python2" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 2 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython2", "version": "2.7.12" } }, "nbformat": 4, "nbformat_minor": 1 }