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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 7 : Cycloconverters"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 7.1, Page No.319"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# input voltage, SCR ratings and input power factors\n",
"\n",
"import math\n",
"#variable declaration\n",
"V = 250 # single phase supply voltage \n",
"I = 50 # supply current\n",
"pf = 0.8 # lagging power factor\n",
"alfa = 0 # ideal SCR\n",
"\n",
"#calculations\n",
"x = math.sqrt(2)\n",
"x = math.floor(x*1000)/1000\n",
"Vm = (V*math.pi*x)/(3*math.sin(math.pi/3))\n",
"Vrms = Vm/math.sqrt(2)\n",
"Irms = I*math.sqrt(2)/math.sqrt(3)\n",
"y = math.sqrt(3)\n",
"y = math.floor(y*1000)/1000\n",
"piv = y*Vm\n",
"piv = math.floor(piv*100)/100\n",
"Ii = math.sqrt((I**2)/3)\n",
"pipp = V*I*pf/3.0\n",
"pf_i = pipp/(Vrms*Ii)\n",
"\n",
"#Result\n",
"print(\"Vm = %f V\\nrms current rating of thyristor = %.1f A\\nPIV = %.2fV\\nRMS value of input current = %.1f A\"%(Vm,math.ceil(Irms),piv,Ii))\n",
"print(\"Power input per phase = %.2f W\\nInput power factor = %.3f lagging.\"%(pipp,pf_i))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Vm = 427.452050 V\n",
"rms current rating of thyristor = 41.0 A\n",
"PIV = 740.34V\n",
"RMS value of input current = 28.9 A\n",
"Power input per phase = 3333.33 W\n",
"Input power factor = 0.382 lagging.\n"
]
}
],
"prompt_number": 32
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 7.2, Page No. 320"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#output voltage(referring ex 7.1)\n",
"\n",
"import math\n",
"#variable declaration\n",
"V = 250 # single phase supply voltage \n",
"theta1 = 30 # firing angle 1\n",
"theta2 = 45 # firing angle 2\n",
"\n",
"#calculations\n",
"#(a)\n",
"v1 = V*math.cos(theta1*math.pi/180)\n",
"#(b)\n",
"v2 = V*math.cos(theta2*math.pi/180)\n",
"\n",
"#Result\n",
"print(\"(a) RMS value of output voltage = %.1f V\"%v1)\n",
"print(\"(b) RMS value of output voltage = %.2f V\"%v2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) RMS value of output voltage = 216.5 V\n",
"(b) RMS value of output voltage = 176.78 V\n"
]
}
],
"prompt_number": 35
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 7.3, Page No.320"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Output voltage for different firing angle\n",
"\n",
"import math\n",
"#variable declaration\n",
"Vrms = 230 # input voltage\n",
"theta1 = 0 # firing angle 1\n",
"theta2 = 30 # firing angle 2\n",
"\n",
"#calculation\n",
"#(a)\n",
"v1 = 6*math.sqrt(2)*Vrms*math.sin(math.pi/6)*math.cos(theta1*math.pi/180)/(math.pi*math.sqrt(2))\n",
"#(b)\n",
"v2 = 6*math.sqrt(2)*Vrms*math.sin(math.pi/6)*math.cos(theta2*math.pi/180)/(math.pi*math.sqrt(2))\n",
"\n",
"\n",
"#Result\n",
"print(\"(a) Vo = %.2f V\\n(b) Vo = %.1f V\"%(v1,v2))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) Vo = 219.63 V\n",
"(b) Vo = 190.2 V\n"
]
}
],
"prompt_number": 37
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 7.4, Page No.320"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# supply voltage\n",
"\n",
"import math\n",
"#variable declaration\n",
"Vo = 200 # output voltage\n",
"\n",
"#Calculation\n",
"Vi = Vo*(math.pi/3)/math.sin(math.pi/3)\n",
"\n",
"#Result\n",
"print(\"RMS value of input voltage = %.2f V \"%Vi)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"RMS value of input voltage = 241.84 V \n"
]
}
],
"prompt_number": 38
}
],
"metadata": {}
}
]
}
|
