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{
"metadata": {
"name": "",
"signature": "sha256:47d75f27ec6c94d8690b19c8285770e7f28c9cd54fabd419e1b2d7d6e6d4afe5"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 2 : Transmission Lion Structures and Equipment"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2.1 Page No : 77"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\n",
"# GIVEN DATA\n",
"t_s = 0.49 ; # Human body is in contact with 60 Hz power for 0.49 sec\n",
"r = 100 ; # Resistivity of soil based on IEEE std 80-2000 \n",
"\n",
"# CALCULATIONS\n",
"# For case (a)\n",
"v_touch50 = 0.116*(1000+1.5*r)/math.sqrt(t_s) ; # Maximum allowable touch voltage for 50 kg body weight in volts\n",
"\n",
"# For case (b)\n",
"v_step50 = 0.116*(1000+6*r)/math.sqrt(t_s) ; # Maximum allowable step voltage for 50 kg body weight in volts\n",
"# Above Equations of case (a) & (b) applicable if no protective surface layer is used\n",
"\n",
"# For metal to metal contact below equation holds good . Hence resistivity is zero\n",
"r_1 = 0 ; # Resistivity is zero\n",
"\n",
"# For case (c)\n",
"v_mm_touch50 = 0.116*(1000)/math.sqrt(t_s) ; # Maximum allowable touch voltage for 50 kg body weight in volts for metal to metal contact\n",
"\n",
"# For case (d)\n",
"v_mm_touch70 = 0.157*(1000)/math.sqrt(t_s) ; # Maximum allowable touch voltage for 70 kg body weight in volts for metal to metal contact\n",
"\n",
"# DISPLAY RESULTS\n",
"print \" a) Tolerable Touch potential , V_touch50 = %.f V , for 50 kg body weight \"%(v_touch50) ;\n",
"print \" b) Tolerable Step potential , V_step50 = %.f V , for 50 kg body weight \"%(v_step50) ;\n",
"print \" c) Tolerable Touch Voltage for metal-to-metal contact , V_mm_touch50 = %.1f V , for 50 kg body weight \"%(v_mm_touch50) ;\n",
"print \" d) Tolerable Touch Voltage for metal-to-metal contact , V_mm_touch70 = %.1f V , for 70 kg body weight \"%(v_mm_touch70) ;\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" a) Tolerable Touch potential , V_touch50 = 191 V , for 50 kg body weight \n",
" b) Tolerable Step potential , V_step50 = 265 V , for 50 kg body weight \n",
" c) Tolerable Touch Voltage for metal-to-metal contact , V_mm_touch50 = 165.7 V , for 50 kg body weight \n",
" d) Tolerable Touch Voltage for metal-to-metal contact , V_mm_touch70 = 224.3 V , for 70 kg body weight \n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
