From c7fe425ef3c5e8804f2f5de3d8fffedf5e2f1131 Mon Sep 17 00:00:00 2001 From: hardythe1 Date: Tue, 7 Apr 2015 15:58:05 +0530 Subject: added books --- _Power_Electronics/Chapter11_2.ipynb | 299 +++++++++++++++++++++++++++++++++++ 1 file changed, 299 insertions(+) create mode 100755 _Power_Electronics/Chapter11_2.ipynb (limited to '_Power_Electronics/Chapter11_2.ipynb') diff --git a/_Power_Electronics/Chapter11_2.ipynb b/_Power_Electronics/Chapter11_2.ipynb new file mode 100755 index 00000000..d2317d28 --- /dev/null +++ b/_Power_Electronics/Chapter11_2.ipynb @@ -0,0 +1,299 @@ +{ + "metadata": { + "name": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 11 : Some Applications" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.1, Page No 622" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#initialisation of variables\n", + "V_s=11000.0\n", + "V_ml=math.sqrt(2)*V_s\n", + "f=50.0\n", + "\n", + "#Calculations\n", + "w=2*math.pi*f\n", + "I_d=300\n", + "R_d=1\n", + "g=20 #g=gamma\n", + "a=math.degrees(math.acos(math.cos(math.radians(g))+math.pi/(3*V_ml)*I_d*R_d)) \n", + "L_s=.01\n", + "V_d=(3/math.pi)*((V_ml*math.cos(math.radians(a)))-w*L_s*I_d) \n", + "\n", + "#Results\n", + "print(\"firing angle=%.3f deg\" %a)\n", + "print(\"rectifier o/p voltage=%.1f V\" %V_d)\n", + "print(\"dc link voltage=%.3f V\" %(2*V_d/1000))" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "firing angle=16.283 deg\n", + "rectifier o/p voltage=13359.3 V\n", + "dc link voltage=26.719 V\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.2, Page No 623" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#initialisation of variables\n", + "V_d=(200.0+200)*10**3\n", + "P=1000.0*10**6\n", + "\n", + "#Calculations\n", + "I_d=P/V_d\n", + " #each thristor conducts for 120deg for a periodicity of 360deg\n", + "a=0\n", + "V_d=200.0*10**3\n", + "V_ml=V_d*math.pi/(3*math.cos(math.radians(a)))\n", + "\n", + "#Results\n", + "print(\"rms current rating of thyristor=%.2f A\" %(I_d*math.sqrt(120/360)))\n", + "print(\"peak reverse voltage across each thyristor=%.2f kV\" %(V_ml/2/1000))" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "rms current rating of thyristor=0.00 A\n", + "peak reverse voltage across each thyristor=104.72 kV\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.3 Page No 627" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#initialisation of variables\n", + "V_m=230.0\n", + "V_s=230/math.sqrt(2)\n", + "pf=0.8\n", + "P=2000.0\n", + "\n", + "#Calculations\n", + "I_m=P/(V_s*pf)\n", + "I_Tr=I_m/math.sqrt(2)\n", + "I_TA=2*I_m/math.pi\n", + "fos=2 #factor of safety\n", + "PIV=V_m*math.sqrt(2)\n", + "I_Tr=I_m/(2)\n", + "I_TA=I_m/math.pi\n", + "\n", + "#Results\n", + "print(\"rms value of thyristor current=%.2f A\" %(fos*I_Tr))\n", + "print(\"avg value of thyristor current=%.3f A\" %(fos*I_TA))\n", + "print(\"voltage rating of thyristor=%.2f V\" %PIV)\n", + "print(\"rms value of diode current=%.3f A\" %(fos*I_Tr))\n", + "print(\"avg value of diode current=%.3f A\" %(fos*I_TA))\n", + "print(\"voltage rating of diode=%.2f V\" %PIV)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "rms value of thyristor current=15.37 A\n", + "avg value of thyristor current=9.786 A\n", + "voltage rating of thyristor=325.27 V\n", + "rms value of diode current=15.372 A\n", + "avg value of diode current=9.786 A\n", + "voltage rating of diode=325.27 V\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.4, Page No 629" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#initialisation of variables\n", + "V=200.0\n", + "I=10.0\n", + "\n", + "#Calculations\n", + "R_L=V/I \n", + "I_h=.005 #holding current\n", + "R2=V/I_h \n", + "t_c=20*10**-6\n", + "fos=2 #factor of safety\n", + "C=t_c*fos/(R_L*math.log(2)) \n", + "\n", + "#Results\n", + "print(\"value of load resistance=%.0f ohm\" %R_L)\n", + "print(\"value of R2=%.0f kilo-ohm\" %(R2/1000))\n", + "print(\"value of C=%.3f uF\" %(C*10**6))" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "value of load resistance=20 ohm\n", + "value of R2=40 kilo-ohm\n", + "value of C=2.885 uF\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.5 Page No 646" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#initialisation of variables\n", + "u_r=10\n", + "f=10000.0 #Hz\n", + "p=4.0*10**-8 #ohm-m\n", + "\n", + "#Calculations\n", + "dl=(1/(2*math.pi))*math.sqrt(p*10**7/(u_r*f)) \n", + "l=0.12 #length of cylinder\n", + "t=20.0 #no of turns\n", + "I=100.0\n", + "H=t*I/l\n", + "P_s=2*math.pi*H**2*math.sqrt(u_r*f*p*10**-7) \n", + "d=.02 #diameter\n", + "P_v=4*H**2*p/(d*dl) \n", + "\n", + "#Results\n", + "print(\"depth of heat of penetration=%.5f mm\" %(dl*1000))\n", + "print(\"heat generated per unit cylinder surface area=%.3f W/m**2\" %P_s)\n", + "print(\"heat generated per unit cylinder volume=%.0f W/m**3\" %P_v)\n", + " #answer of P_v varies as given in book as value of d is not taken as in formulae. " + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "depth of heat of penetration=0.31831 mm\n", + "heat generated per unit cylinder surface area=34906.585 W/m**2\n", + "heat generated per unit cylinder volume=6981317 W/m**3\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.6 Page No 646" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#initialisation of variables\n", + "f=3000.0\n", + "\n", + "#Calculations\n", + "t_qmin=30.0*10**-6\n", + "f_r=f/(1-2*t_qmin*f)\n", + "R=0.06\n", + "L=20.0*10**-6\n", + "C=1/(L*((2*math.pi*f_r)**2+(R/(2*L))**2)) \n", + "\n", + "#Results\n", + "print(\"required capacitor size=%.4f F\" %(C*10**6))\n", + " #Answers have small variations from that in the book due to difference in the rounding off of digits." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "required capacitor size=94.2215 F\n" + ] + } + ], + "prompt_number": 6 + } + ], + "metadata": {} + } + ] +} \ No newline at end of file -- cgit