From 6279fa19ac6e2a4087df2e6fe985430ecc2c2d5d Mon Sep 17 00:00:00 2001 From: kinitrupti Date: Fri, 12 May 2017 18:53:46 +0530 Subject: Removed duplicates --- Electrical_Power-i_by_M.L._Anand/Chapter8.ipynb | 364 ++++++++++++++++++++++++ 1 file changed, 364 insertions(+) create mode 100755 Electrical_Power-i_by_M.L._Anand/Chapter8.ipynb (limited to 'Electrical_Power-i_by_M.L._Anand/Chapter8.ipynb') diff --git a/Electrical_Power-i_by_M.L._Anand/Chapter8.ipynb b/Electrical_Power-i_by_M.L._Anand/Chapter8.ipynb new file mode 100755 index 00000000..b2ca03f6 --- /dev/null +++ b/Electrical_Power-i_by_M.L._Anand/Chapter8.ipynb @@ -0,0 +1,364 @@ +{ + "metadata": { + "name": "", + "signature": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter8 - Underground cables and faults" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.1 - page 222" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from numpy import exp, pi\n", + "#given data\n", + "R=500 #in Mohm/Km\n", + "R=R*10**6 #in ohm\n", + "r1=2.5/2 #in cm\n", + "r1=r1*10**-2 #in meter\n", + "rho=4.5*10**16 #in ohm/cm\n", + "rho=rho*10**-2 #in ohm/m\n", + "l=1 #in Km\n", + "l=l*1000 #in meter\n", + "#Formula : R=(rho/(2*pi*l))*log(r2/r1)\n", + "r2=(exp(R/(rho/(2*pi*l))))*r1 #in meter\n", + "thickness=r2-r1 #in meter\n", + "thickness=thickness*100 #in cm\n", + "print \"Thickness of Insulation = %0.3f cm\" %thickness\n", + "# Answer in the textbook is wrong due to accuracy." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Thickness of Insulation = 0.009 cm\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.2 - page 223" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from numpy import log10\n", + "#given data\n", + "d=1 #in cm\n", + "d=d*10**-2 #in meter\n", + "D=1.8 #in cm\n", + "D=D*10**-2 #in meter\n", + "epsilon_r=4 #permittivity of insulation\n", + "C=0.024*epsilon_r/log10(D/d) #in uF/Km\n", + "print \"Capacitance/km of the fibre = %0.3f uF\" %C" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Capacitance/km of the fibre = 0.376 uF\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.3 - page 223" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from numpy import log\n", + "#given data\n", + "V=33 #in KV\n", + "d=1 #in cm\n", + "D=4 #in cm\n", + "#Part (a) :\n", + "gmax=2*V/(d*log(D/d)) #in KV/cm\n", + "print \"Maximum Stress = %0.1f KV/cm\" %gmax\n", + "#Part (b) :\n", + "gmin=2*V/(D*log(D/d)) #in KV/cm\n", + "print \"Minimum Stress = %0.0f KV/cm\" %round(gmin)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Maximum Stress = 47.6 KV/cm\n", + "Minimum Stress = 12 KV/cm\n" + ] + } + ], + "prompt_number": 10 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.4 - page 224" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from math import sqrt\n", + "#given data\n", + "Vrms=66 #in KV\n", + "gmax=40 #in KV/cm\n", + "V=sqrt(2)*Vrms #in Volt\n", + "#Part (a) : \n", + "d=2*V/gmax #in cm\n", + "print \"The most economical diameter = %0.3f cm\" %d\n", + "#Part (b) : \n", + "PeakVoltage=sqrt(2)*Vrms/sqrt(3) #in Volt\n", + "V=PeakVoltage #in Volt\n", + "d=2*V/gmax #in cm\n", + "print \"The most economical diameter for 3 phase system = %0.1f m\" %d" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The most economical diameter = 4.667 cm\n", + "The most economical diameter for 3 phase system = 2.7 m\n" + ] + } + ], + "prompt_number": 13 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.5 - page 224" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "from math import sqrt\n", + "#given data\n", + "d=2 #in cm\n", + "D=2.5*2 #in cm\n", + "d1=(5/4)*d #in cm\n", + "d2=(5/3)*d #in cm\n", + "gmax=40 #in KV/cm\n", + "PeakVoltage=(gmax/2)*(d*log(d1/d)+d1*log(d2/d1)+d2*log(D/d2)) #in KV\n", + "print \"The safe Working Potential = %0.1f KV\" %(PeakVoltage/sqrt(2))" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The safe Working Potential = 35.6 KV\n" + ] + } + ], + "prompt_number": 17 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.6 - page 25" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "from numpy import pi, sqrt\n", + "#given data\n", + "CN=0.4 #in uF\n", + "V=33 #in KV\n", + "VP=V/sqrt(3) #in KV\n", + "f=25 #in Hz\n", + "#Capacitance between 2 cores for 15 Km length\n", + "CN_1=15*CN #in uF\n", + "#Capacitance of each core to neutral\n", + "CN=2*CN_1 #in uF\n", + "#Charging current per phase\n", + "I=2*pi*f*VP*1000*CN*10**-6 #in Ampere\n", + "print \"Charging current per phase = %0.2f A\" %round(I)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Charging current per phase = 36.00 A\n" + ] + } + ], + "prompt_number": 18 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.7 - page 225" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "from numpy import pi, sqrt\n", + "#given data\n", + "l=10 #in Km\n", + "C=0.3 #in uF\n", + "V=22 #in KV\n", + "VP=V/sqrt(3) #in KV\n", + "VP=VP*1000 #in Volt\n", + "f=50 #in Hz\n", + "Capacitance=C*l #in uF\n", + "CN=2*Capacitance #in uF\n", + "KVA_Taken=3*VP*2*pi*f*VP*CN*10/1000 #in KVA\n", + "print \"KVA taken by the 10 Km cable = %0.3e KVA\" %KVA_Taken" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "KVA taken by the 10 Km cable = 9.123e+09 KVA\n" + ] + } + ], + "prompt_number": 21 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.8 - page 225" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#given data\n", + "P=10 #in Ohm\n", + "Q=80 #in Ohm\n", + "S2=3400 #in Ohm\n", + "S1=2400 #in Ohm\n", + "X=P*(S2-S1)/(P+Q) #in Ohm\n", + "LoopResistance=P*S2/Q #in Ohm\n", + "ResistancePerKm=LoopResistance/10 #in Ohm\n", + "Distance=X/ResistancePerKm #in Km\n", + "print \"Distance of fault from testing end = %0.3f Km\" %Distance" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Distance of fault from testing end = 2.614 Km\n" + ] + } + ], + "prompt_number": 23 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Exa 8.9 - page 226" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#given data\n", + "Resistance=1.6 #in ohm/Km\n", + "l=1000 #in meter\n", + "PbyQ=3 #unitless\n", + "PplusQbyQ=4 #unitless\n", + "LoopResistance=(Resistance/1000)*2*l #in Ohm\n", + "X=(1/PplusQbyQ)*LoopResistance #in Ohm\n", + "Distance=X/(Resistance/1000) #in meter\n", + "print \"Distance of Fault from testing end = %0.2f meters\" %Distance" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Distance of Fault from testing end = 500.00 meters\n" + ] + } + ], + "prompt_number": 24 + } + ], + "metadata": {} + } + ] +} -- cgit