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{
"metadata": {
"name": "",
"signature": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 1, Basic Concepts"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 1.1 - page 13"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from numpy import sqrt\n",
"#Given data : \n",
"R=4 #in ohm\n",
"XL=3 #in ohm\n",
"VL=400 #in volt\n",
"Vph=VL/sqrt(3) #in volt\n",
"Zph=sqrt(R**2+XL**2) #in ohm\n",
"Iph=Vph/Zph #in Ampere\n",
"#In star connected IL=Iph\n",
"IL=Iph #in Ampere\n",
"print \"Line Current = %0.1f A\" %IL\n",
"cosfi=R/Zph #unitless\n",
"PowerConsumed=sqrt(3)*VL*IL*cosfi #in watts\n",
"print \"Total power consumed by the load = %.f Watts\" %PowerConsumed "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Line Current = 46.2 A\n",
"Total power consumed by the load = 25600 Watts\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 1.2 - page 14"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from numpy import sqrt\n",
"#Given data : \n",
"VL=440 #in volt\n",
"IL=10 #in Ampere\n",
"#In star connected :\n",
"print \"In star connected :\" \n",
"Iph=IL #in Ampere\n",
"Vph=VL/sqrt(3) #in volt\n",
"Rph=Vph/Iph #in ohm\n",
"print \"Value of each resistor = %.1f ohm\" %Rph\n",
"#In delta connected :\n",
"print \"In delta connected :\"\n",
"Iph=IL/sqrt(3) #in Ampere\n",
"Vph=Iph*Rph #in volt\n",
"print \"Voltage in delta connection = %.2f volt\" %Vph"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"In star connected :\n",
"Value of each resistor = 25.4 ohm\n",
"In delta connected :\n",
"Voltage in delta connection = 146.67 volt\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 1.3 - page 15"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from numpy import sqrt, pi\n",
"#Given Data :\n",
"R=16 #in ohm\n",
"L=38.2 #in mH\n",
"L=38.2*10**-3 #in H\n",
"VL=400 #in volt\n",
"f=50 #in Hz\n",
"XL=2*pi*f*L #in ohm\n",
"Zph=sqrt(R**2+XL**2) #in ohm\n",
"#In star connected :\n",
"Vph=VL/sqrt(3) #in volt\n",
"Iph=Vph/Zph #in Ampere\n",
"IL=Iph #in Ampere\n",
"print \"Line Current = %0.2f A\" %IL\n",
"cosfi=R/Zph #unitless\n",
"print \"Power factor = %.1f\" %cosfi\n",
"P=sqrt(3)*VL*IL*cosfi #in watts\n",
"P/=10**3 # kW\n",
"print \"Total power consumed by the load = %0.3f kW\" %P"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Line Current = 11.55 A\n",
"Power factor = 0.8\n",
"Total power consumed by the load = 6.400 kW\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Exa 1.4 - page 15"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"from numpy import sqrt\n",
"#Given Data :\n",
"R=15 #in ohm\n",
"X=40 #in ohm\n",
"VL=440 #in volt\n",
"#In delta connection : \n",
"Vph=VL #in volt\n",
"Zph=sqrt(R**2+X**2) #in ohm\n",
"Iph=Vph/Zph #in Ampere\n",
"print \"Phase Current = %0.1f A\" %Iph\n",
"IL=Iph*sqrt(3) #in Ampere\n",
"print \"Line Current = %0.2f A\" %IL"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Phase Current = 10.3 A\n",
"Line Current = 17.84 A\n"
]
}
],
"prompt_number": 13
}
],
"metadata": {}
}
]
}
|
