generators ppt
TRANSCRIPT
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Introduction toGenerators
Lecture # 29-32
Mujahid Mehdi Abro IndusUniversity
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Introduction to Generators
The device which converts mechanicalenergy to electrical energy is called
generator
GENERATOR
ELECTRICAL ENERGYMEHANICAL ENERGY
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rinci!le o" #or$ing%
In generators mechanical energy istrans"ormed into electrical energy&
The !rinci!le o" all o" the generators issame' although the detail o"construction may (e di)er somewhat&
A generator has two main !arts% Coil
Magnet
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#or$ing%
Generator wor$s on*araday+s law o"electromagnetic
induction& #hen coil isrotated in a magnetic,eld (y somemechanical meansmagnetic -u. ischanged through thecoil and conse/uently
EM* is induced in the
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Classi,cation o" Generators%Generators are classi,ed in various ways'
li$e %
According to wor$ing%
Electrostatic generators
Electromagnetic generators According to out0!ut%
Ac generators
1C generators
According to mechanical wor$ in0!ut%
Engine generators'
Human !owered generators'
Tur(ine generator'#ind mill enerators
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Electrostatic Generators%
2e"ore the connection(etween electricityand magnetism was
discoveredElectrostaticgenerators were
invented& They were never used
"or commercial !ower
generation and were
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rinci!le o" electromagnetic
induction% The scienti,c !rinci!le on which modern
generators wor$ was discovered (y
Michel *araday' he gave ,rst electricaldemonstration o" electromagneticinduction in august 4564&
Then he created world+s ,rst electricalgenerator caller 7*araday+s dis$8
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9tand(y Generators% These are large' o"ten
!ermanent units o"tenstationed outside a(uilding and li$e to
!rovide (ac$u! !owerin case the inelectricity switches
o)& They can sense when
a !ower interru!tionhas occurred andautomaticall start to
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orta(le Generators%
These generators aredesigned to (etrans!orted whether on
cart trailer or (y handwhere there is no utilityo" !ower&
They are ca!a(le o"!roviding u! to 4:::$ilowatts o" !ower&
They use either diesel
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Commercial Generators%
In areas where!ower su!!ly isintermittent orlac$ing as in THIR1#;RL1 !rovincialareas' generators
can also (e set u! to!rovide additional!ower&
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