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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 03 : Capacitance of Transmission Lines"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3.1, Page No 49"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"Dm=2.015 \t\t# mutual GMD of conductors(m)\n",
"r=0.4 \t\t\t# radius of conductor(cm)\n",
"\n",
"#Calculations\n",
"C=10**-9*1000.0/(18*math.log(201.5/.4)) \n",
"Ic=132*1000.0*8.928*314*(10**-9)/math.sqrt(3.0)\n",
"\n",
"#Results\n",
"print(\"capacitance =%.13f F/km\" %C) #Answers don't match due to different representation\n",
"print(\"charging current=%.4f amp/km\" %Ic) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"capacitance =0.0000000089288 F/km\n",
"charging current=0.2136 amp/km\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3.2, Page No 52"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"GMDm=6.61 \t\t#mutual GMD(m)\n",
"\n",
"#Calculations\n",
"Ds1=math.sqrt(1.25*(10**-2)*10.965) \n",
"Ds3=Ds1 \n",
"Ds2=math.sqrt(1.25*(10**-2)*9) \n",
"Ds=((Ds1*Ds2*Ds3)**.333333) \n",
"C=1/(18*math.log(GMDm/Ds)) \n",
"Ic=220*1000*314*.01905*(10**-6)/math.sqrt(3) \n",
"\n",
"#Results\n",
"print(\"capacitance =%.6f micro-Farad/km\" %C) \n",
"print(\"charging current =%.2f amp/km\" %Ic)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"capacitance =0.019057 micro-Farad/km\n",
"charging current =0.76 amp/km\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3.3, Page No 53"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"GMD=8.19 \n",
"\n",
"#Calculations\n",
"Ds=math.sqrt(2.25*(10**-2)*.4) \n",
"C=1/(18*math.log(GMD/Ds)) \n",
"Ic=220*1000*314*C*(10**-6)/math.sqrt(3) \n",
"\n",
"#Results\n",
"print(\"capacitance per km =%.5f micro-Farad\" %C) \n",
"print(\"charging current =%.3f amp\" %Ic) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"capacitance per km =0.01246 micro-Farad\n",
"charging current =0.497 amp\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
