From 8048392490bd2efe0fdfa001945f663cba969841 Mon Sep 17 00:00:00 2001 From: nice Date: Thu, 9 Oct 2014 18:07:00 +0530 Subject: updated books --- Principles_of_Power_System/chapter19_1.ipynb | 212 --------------------------- 1 file changed, 212 deletions(-) delete mode 100644 Principles_of_Power_System/chapter19_1.ipynb (limited to 'Principles_of_Power_System/chapter19_1.ipynb') diff --git a/Principles_of_Power_System/chapter19_1.ipynb b/Principles_of_Power_System/chapter19_1.ipynb deleted file mode 100644 index e6813a0f..00000000 --- a/Principles_of_Power_System/chapter19_1.ipynb +++ /dev/null @@ -1,212 +0,0 @@ -{ - "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": {} - } - ] -} \ No newline at end of file -- cgit