{ "metadata": { "name": "", "signature": "sha256:1ec371cb843067028dd1e055f435f5ad6cdc4ce9c5ed963c08c525b60770abca" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "

Chapter 39: Dielectrics and dielectric loss

" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "

Example 1, page no. 717

" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\n", "from __future__ import division\n", "import math\n", "#initializing the variables:\n", "Rs = 1.5;# in ohms\n", "Cs = 400E-12;# in Farads\n", "f = 8E6;# in Hz\n", "\n", "#calculation: \n", " #for a series equivalent circuit,\n", " #tan(del) = Rs*w*Cs\n", " #loss angle,\n", "de = math.atan(Rs*Cs*(2*math.pi*f))\n", " #power factor\n", "pf = math.cos(de)\n", " #the Q-factor\n", "Q = 1/math.tan(de)\n", " #dissipation factor,\n", "D = 1/Q\n", "\n", "\n", "#Results\n", "print \"\\n\\n Result \\n\\n\"\n", "print \"\\n (a)loss angle \",round(de,2),\" rad.\"\n", "print \"\\n (b)power factor \",round(de,2),\" rad.\"\n", "print \"\\n (c)Q-factor is \",round(Q,2)\n", "print \"\\n (d)dissipation factor \",round(D,2),\" rad.\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "\n", "\n", " Result \n", "\n", "\n", "\n", " (a)loss angle 0.03 rad.\n", "\n", " (b)power factor 0.03 rad.\n", "\n", " (c)Q-factor is 33.16\n", "\n", " (d)dissipation factor 0.03 rad." ] } ], "prompt_number": 1 }, { "cell_type": "markdown", "metadata": {}, "source": [ "

Example 2, page no. 718

" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\n", "from __future__ import division\n", "import math\n", "#initializing the variables:\n", "de = 0.025;# in rad.\n", "V = 5000;# in Volts\n", "PL = 20;# power loss\n", "f = 50;# in Hz\n", "\n", "#calculation: \n", " #power loss = w*C*V**2*tan(del)\n", "Cp = PL/(2*math.pi*f*V*V*math.tan(de))\n", " #for a parallel equivalent circuit,\n", " #tan(del) = 1/(Rp*w*Cp)\n", "Rp = 1/(2*math.pi*f*Cp*math.tan(de))\n", "\n", "\n", "#Results\n", "print \"\\n\\n Result \\n\\n\"\n", "print \"\\n capacitance C \",round(Cp*1E6,2),\"uF and parallel resistance \",round(Rp,2),\"ohm.\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "\n", "\n", " Result \n", "\n", "\n", "\n", " capacitance C 0.1 uF and parallel resistance 1250000.0 ohm." ] } ], "prompt_number": 2 }, { "cell_type": "markdown", "metadata": {}, "source": [ "

Example 3, page no. 718

" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\n", "from __future__ import division\n", "import math\n", "#initializing the variables:\n", "P = 500E-6;# in Watt\n", "C = 2000E-12;# in Farads\n", "V = 20;# in Volts\n", "f = 10000;# in Hz\n", "\n", " #calculation: \n", " #power loss = w*C*V**2*tan(del)\n", " #loss angle\n", "de = math.atan(P/(2*math.pi*f*V*V*C))\n", " #for an equivalent series circuit,\n", " #tan(del) = (Rs*w*Cs)\n", "Cs = C\n", "Rs = (math.tan(de))/(2*math.pi*f*Cs)\n", " #for an equivalent parallel circuit\n", " #tan(del) = 1/(Rp*w*Cp)\n", "Cp = C\n", "Rp = 1/(2*math.pi*f*Cp*math.tan(de))\n", "\n", "\n", "#Results\n", "print \"\\n\\n Result \\n\\n\"\n", "print \"\\n (a)loss angle \",round(de*180/math.pi,2),\"deg\"\n", "print \"\\n (b)series resistance \",round(Rs,2),\" ohm.\"\n", "print \"\\n (c)parallel resistance \",round(Rp/1000,2),\"Kohm.\"" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "\n", "\n", " Result \n", "\n", "\n", "\n", " (a)loss angle 0.57 deg\n", "\n", " (b)series resistance 79.16 ohm.\n", "\n", " (c)parallel resistance 800.0 Kohm." ] } ], "prompt_number": 1 } ], "metadata": {} } ] }