1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
{
"metadata": {
"name": "",
"signature": "sha256:c04662c5bd4f38db1beb13d324aa5f4b0617ec914f453499de17aa02ac050633"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 12 - NEUTRAL GROUNDING"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ecample E1 - Pg 311"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate Reactance of coil\n",
"#Given data :\n",
"import math\n",
"f=50.##Supply frequency in Hz\n",
"C=4.5*10.**-6##in Farad\n",
"Omega_L=1./3./2./math.pi/f/C##in ohm\n",
"print '%s %.2f' %(\"Reactance of coil (ohm) :\",Omega_L)#\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Reactance of coil (ohm) : 235.79\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ecample E2 - Pg 311"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate Necessary Inductance of peterson coil,Rating of supressor coil in MVA\n",
"#Given data :\n",
"import math\n",
"V=132.*1000.##V\n",
"f=50.##Hz\n",
"r=10./1000.##m\n",
"d1=4.##m\n",
"d2=4.##m\n",
"d3=d1+d2##m\n",
"epsilon_o=8.854*10.**-12##constant\n",
"l_tl=192.*1000.##length of transmission line in m\n",
"C=2.*math.pi*epsilon_o/math.log((d1*d2*d3)**(1./3.)/r)*l_tl##in Farad\n",
"L=1./3./(2.*math.pi*f)**2./C##H\n",
"print '%s %.3f' %(\"Necessary Inductance of peterson coil in H : \",L)#\n",
"VP=V/math.sqrt(3.)##V\n",
"IL=VP/(2.*math.pi*f)/L##A\n",
"Rating=VP*IL/1000.##kVA\n",
"print '%s %.2f' %(\"Rating of supressor coil in MVA :\",Rating/1000)#\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Necessary Inductance of peterson coil in H : 1.968\n",
"Rating of supressor coil in MVA : 9.40\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
