Question

Research Project 1 In not more than 5 pages, show the difference in characteristics (show the curves) and applications of DC Generators based on the following methods of field excitation type: 1. Separately excited generators 2. Self-excited shunt wound generators 3. Self-excited series wound generators 4. Self-excited compound wound generators

Answer 1

and applications of differerst types of De generatora * Differences in characteristics i Type of Open circuút molor Characteristics LEOvis It) Seperately no qto) a Internal asso. Evo Ia) & External characteristé VIL) Applieations and cocuit diagram I excited road) DC generator portal I Armature CÁC Beaclo) External --> No load voltge (EO) > Grenerated voltae to > Terminal-voltge cry chars increse Er Speed Insternal drop ohmic voltage drop. I chans >-field Current If koad Current IL → If there is no armature reaction are armature voltage drop the voltage 00111 remain constant for any load current, Thus the Gtraight line above AB IG above figure reprecents no load volége, → Due to demagnetering effect of ammature reaction, on load earst generated emf is less than the no load roitige → Terminal voltage v os Lesser ! due to ohmic drop occuring in the amature and brushes. Ia = Il - Applecottose. This dogers requires o controlled hectifiers. Olode Recifceri ☺ Batteries or another - Dc Gource for field winding Geperatly Go This generator cs more Expensive coes en coard Leonard Bystems of speed control, For testing purposes in Laboratories ; Excitation Cource for Large alternators and also used as auxiliary and emergency power Supplies scanned with LamScanner

RE ARD 0 0.00 characteristics Faceted Carne as Ghunt Gereces arent Geperately perentor Ereled do generators COUD. OK- RUSC to tog Internal Characteristics DA Fisternal characteristics Applications: the curre AB infeg > In DC Locoto motive to identical to 0.c.c Curve This provide Bregenerative braking because in De Gerie's corta dillribution generators flebol cinsing en | neteoorks as a boocter that Connected in Cerers cofin armebure helps to increase the voltage and lood.cil it). In De Gerless L In series are Lighting gercolor, terminal voltage increased and heavy pocoer Supply cofth-the load Current . 15:6 as - For the arc coelding because as the load current I purpose increases, feeld Current also increas Hoddever beyond a certaso (mit, terminal voltago Gtario decreacing Colin create in load. This is dure to Erceolive derragpetecina e pofects of the armature reaction Scanned with CamScanner

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SALLEH | Ghort Shunt: Excited Corespond Came as above generators Bover Compound Flal Compound under Compocend I TL Rise 3 sner with . Ria * - >IL, If Geries conding amp -turns Ghost Est Long Cheent:- are adjusted Go-that, incre se in Load current cauces increaſe in terminal voltage then the generator is called to be over compounded.CAB) 1- Ip Gerles coinding amp-tums are adjusted Go that, terminal H Arc coelding to regulate the | voltage remains Constant even the voltage drop head current increased then the | Feeders to compensate I generator is called as Flat | voltage drop | ComƠded Chic) . - Regulating the rottage for → FB the Geriers coinding has | a broad variety of Londra Lelo no. of tums than that wocelo be required to be that range de To Groll distance Operation Compounded , then the generator Cuch as supplying hotel's offices Es called to be under Compounded. mpounded. ) homes and Lodges. wocele