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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 07 : Mechanical Design of Transmission Lines"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.1, Page No 161"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"sf=5.0\t #Factor of safety\n",
"d=0.95\t # conductor dia(cm)\n",
"\n",
"#Calculations\n",
"Ws=4250.0/sf # working stress(kg/cm_2)\n",
"A=math.pi*(d**2)/4.0 # area (cm_2)\n",
"Wp=40.0*d*(10**-2) #wind pressure (kg/cm)\n",
"W=math.sqrt((.65**2)+(0.38**2)) # Total effective weight(kg/m)\n",
"T=850.0*A # working tension (kg)\n",
"c=T/W\n",
"l=160.0\n",
"d=l**2/(8*800)\n",
"\n",
"#Results\n",
"print(\"sag, d=%.0f metres \" %d)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"sag, d=4 metres \n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.2, Page No 161"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"D=1.95 + 2.6\t\t\t# overall diameter(cm)\n",
"A=4.55*(10**-2)\t\t\t# area(m_2)\n",
"d=19.5\t\t\t\t\t#diameter of conductor(mm)\n",
"r=d/2.0\t\t\t\t\t#radius of conductor(mm)\n",
"\n",
"#Calculations\n",
"Wp=A*39 #wind pressure(kg/m_2)\n",
"t=13 #ice coating(mm)\n",
"US=8000.0 # ultimate strength(kg)\n",
"Aice=math.pi*(10**-6)*((r+t)**2 - r**2)#area section of ice (m_2)\n",
"Wice=Aice*910\n",
"W=(math.sqrt((.85+Wice)**2 + Wp**2))# total weight of ice (kg/m)\n",
"T=US/2.0 # working teansion (kg)\n",
"c=T/W\n",
"l=275 #length of span(m)\n",
"Smax=l*l/(8*c)\n",
"\n",
"#Results\n",
"print(\"Maximum sag=%.1f metres\\n\" %Smax)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum sag=6.4 metres\n",
"\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.3, Page No 162"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"import numpy\n",
"#initialisation of variables\n",
"A=13.2\t\t\t\t# cross section of conductor (mm_2)\n",
"Ar=4.1*(10**-3)\t\t# projected area\n",
"Wp=Ar*48.82\t\t\t# wind loadind /m(kg/m)\n",
"w=0.115\n",
"\n",
"#Calculations\n",
"W=math.sqrt((.1157**2)+(Wp**2))# effective loading per metre(kg)\n",
"q1=W/0.115\n",
"b=w/A\n",
"f1=21.0\t\t#working stress\n",
"T1=f1*A\n",
"c=T1/W\n",
"l=45.7\n",
"S=l*l/(8*c)\n",
"dT=32.2-4.5# difference in temperature\n",
"E=1.26*(10000)\n",
"a=16.6*(10**-6)\n",
"d=8.765*(10**-3)\n",
"K=f1-((l*d*q1)**2)*E/(24*f1*f1)\n",
"p=numpy.polynomial.polynomial.polyval3d(-84.23,0,-14.44,1)\n",
"r=numpy.roots(p)\n",
"f2= 14.823332# accepted value of f2\n",
"T=f2*A\n",
"c=T/w\n",
"d1=l*l/(8*c)\n",
"\n",
"#Results\n",
"print(\"sag at 32.2 Celsius , d=%.4f metres\" %d1)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"sag at 32.2 Celsius , d=0.1534 metres\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7.4 Page No 165"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"T=2000.0 # working tension (kg)\n",
"w=1.0 \n",
"c=T/w \n",
"h=90-30 \n",
"l=300.0 #span(m)\n",
"\n",
"#Calculations\n",
"a=(l/2)-(c*h/l) \n",
"b=550.0 \n",
"d1=a*a/(2*c) \n",
"d2=(400**2)/(2*c) # sag at 400 metres(m)\n",
"Hm=d2-d1 #height of mid point with respect to A\n",
"Cl=30+Hm\n",
"\n",
"#Results \n",
"print(\"The clearance between the conductor and water level midway between the towers= %.3f metres \" %Cl) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The clearance between the conductor and water level midway between the towers= 54.375 metres \n"
]
}
],
"prompt_number": 8
}
],
"metadata": {}
}
]
}
|
