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| author | nice | 2014-09-16 17:48:17 +0530 |
|---|---|---|
| committer | nice | 2014-09-16 17:48:17 +0530 |
| commit | b8bb8bbfa81499ad7fc3f3508be257da65f543af (patch) | |
| tree | 204976d3209b79a52e8518c65fa27a4ca48f8489 /Principles_of_Power_System/chapter19_1.ipynb | |
| parent | 2792e8d6ecab454e3cb8fb1ea1f26f1613bc1e1c (diff) | |
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diff --git a/Principles_of_Power_System/chapter19_1.ipynb b/Principles_of_Power_System/chapter19_1.ipynb new file mode 100644 index 00000000..e6813a0f --- /dev/null +++ b/Principles_of_Power_System/chapter19_1.ipynb @@ -0,0 +1,212 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:34f21e34d56021d11e412854716405b885521e02b7e263afa0b62d127f14da0d"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 19: Circuit Breakers"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 19.1, Page Number: 483"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration:\n",
+ "I = 1500 #rated current of circuit breaker(A)\n",
+ "MVA = 1000 #MVA rating of CB\n",
+ "V = 33 #voltage rating of circuit breaker(kV)\n",
+ "\n",
+ "\n",
+ "\n",
+ "#Calculation:\n",
+ "Is = MVA*10**6/(3**0.5*33*1000) #Rated symmetrical breaking current(A,rms)\n",
+ "Im = 2.55*Is #Rated making current(A,peak)\n",
+ "\n",
+ "\n",
+ "#Result:\n",
+ "print \"(i) Rated normal current is\",I,\"A\"\n",
+ "print \"(ii) Breaking capacity is\",MVA,\"MVA\"\n",
+ "print \"(iii) Rated symmetrical breaking current is\",round(Is),\"A (peak)\"\n",
+ "print \"(iv) Rated making current is\",round(Im),\"A (peak)\"\n",
+ "print \"(v) Short-time rating is\",round(Is),\"for 3 seconds\"\n",
+ "print \"(vi) Rated service voltage is\",V,\"kV (r.m.s)\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "(i) Rated normal current is 1500 A\n",
+ "(ii) Breaking capacity is 1000 MVA\n",
+ "(iii) Rated symmetrical breaking current is 17495.0 A (peak)\n",
+ "(iv) Rated making current is 44613.0 A (peak)\n",
+ "(v) Short-time rating is 17495.0 for 3 seconds\n",
+ "(vi) Rated service voltage is 33 kV (r.m.s)\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 19.2, Page Number: 484"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from __future__ import division\n",
+ "import math\n",
+ "\n",
+ "#Variable declaration:\n",
+ "f = 50 #supply frequency(Hz)\n",
+ "V = 11 #voltage rating of generator(V)\n",
+ "C = 0.01 #distributed capacitance upto ckt breaker b/w phase and neutral(uF)\n",
+ "XL = 5 #reactance of neatral to earth(ohm)\n",
+ "\n",
+ "\n",
+ "#Calculation:\n",
+ "L = round(XL/(2*math.pi*f),4) #Inductance per phase(H)\n",
+ "Emax = round(2**0.5*V/3**0.5,2) #Maximum value of recovery voltage (phase to neutral)(V\n",
+ "E = 2*Emax #Peak re-striking voltage(kV)\n",
+ "fn = 1/(2*3.14*(L*C*10**-6)**0.5) #frequency of oscillations(Hz)\n",
+ "\n",
+ "#Since peak re-striking voltage occurs at a time t given by\n",
+ "t = 1/(2*fn) #s\n",
+ "r = E/t #kV/sec\n",
+ "\n",
+ "\n",
+ "\n",
+ "#Result:\n",
+ "print \"(i) Peak re-striking voltage is\",round(E,2),\"kV\"\n",
+ "print \"(ii) Frequency of oscillations is\",round(fn),\"Hz\"\n",
+ "print \"(iii)The average rate of rise of re-striking voltage\"\n",
+ "print \" upto the first peak is\",math.floor(r/1000),\"*10**3 kV/sec\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "(i) Peak re-striking voltage is 17.96 kV\n",
+ "(ii) Frequency of oscillations is 12628.0 Hz\n",
+ "(iii)The average rate of rise of re-striking voltage\n",
+ " upto the first peak is 453.0 *10**3 kV/sec\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 19.3, Page Number: 484"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Variable delaration:\n",
+ "t = 50*10**-6 #time to reach the peak re-striking voltage(s)\n",
+ "Vp = 100 #the peak re-striking voltage(kV)\n",
+ "\n",
+ "\n",
+ "#Calculation:\n",
+ "R = Vp/t #Average RRRV(kV/sec)\n",
+ "fn = 1/(2*t) #Natural frequency of oscillations(Hz)\n",
+ "\n",
+ "\n",
+ "#Result:\n",
+ "print \"Average RRRV is\",R/10**6,\"* 10**6 kV/sec\"\n",
+ "print \"Natural frequency of oscillations is\",fn,\"Hz\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Average RRRV is 2.0 * 10**6 kV/sec\n",
+ "Natural frequency of oscillations is 10000.0 Hz\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 19.4, Page Number: 485"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration:\n",
+ "Im = 11 #magnetising current of transformer(A)\n",
+ "Ic = 7 #chopped instantaneous value of current(A)\n",
+ "L = 35.2 #inductance (H)\n",
+ "C = 0.0023 #capacitance(uF)\n",
+ "\n",
+ "\n",
+ "#Result:\n",
+ "e = Ic*(L/(C*10**-6))**0.5 #Voltage across breaker contacts at chopping(V)\n",
+ "\n",
+ "\n",
+ "#Result:\n",
+ "print \"Voltage across breaker contacts at chopping is\",round(e/1000),\"kV\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Voltage across breaker contacts at chopping is 866.0 kV\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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