Download Principle Types Of Generator`s

MAULIK PAREKH
140280109061
ELECTRICAL
HARSHAD PARGI
140280109062
MAYUR PARGI
140280109063
Introduction of DC Generator
Principle of DC Generator
Types of Generator’s
Faraday’s Law
Classification’s of Generator’s
Separately Excited DC
Generator’s
Self Excited DC Generator’s
MEHANICAL ENERG Y
GENERATOR
ELECTRICAL ENERGY
There are two types of generators, one is ac
generator and other is dc generator.
Whatever may be the types of generators, it always
converts mechanical power to electrical power.
 An ac generator produces alternating power. A dc
generator produces direct power.
 Both of these generators produce electrical power,
based on same fundamental principle of Faraday's
law of electromagnetic induction
EMF PRODUCE DYNAMICALLY
EMF PRODUCE STATICALLY
If set of stationary conductor’s placed in time
Varying magnetic field then EMF will produce
statically
Separately excited generators are those whose
whose field magnets are energized from external
source of dc current
Separately
Excited
Self Excited
DC
Generator
These are generators in which the field winding is excited
by the output of the generator itself.
there are three types of self excited dc generators.
Series wound
In these type of generators, the field windings are
connected in series with armature conductors
whole electric current flows through the field coils as
well as the load.
 As series field winding carries full load current it is
designed with relatively few turns of thick wire.
 The electrical resistance of series field winding is
therefore very low (nearly 0.5Ω ).
In these type of DC generators the field windings are
connected in parallel with armature conductors
In shunt wound generators the voltage in the field
winding is same as the voltage across the terminal.
The field winding has high resistance and more
number of turns so that only a part of armature current
passes through field winding and the rest passes
through load.
In series wound generators, the output voltage is
directly proportional with load current.
In shunt wound generators, output voltage is
inversely proportional with load current.
A combination of these two types of generators
can overcome the disadvantages of both. This
combination of windings is called compound
wound DC generator.
A compound wound further divided into two
types
The generators in which only shunt field winding is in
parallel with the armature winding
The generators in which shunt field winding is in
parallel with both series field and armature winding