Golgappa.net | Golgappa.org | BagIndia.net | BodyIndia.Com | CabIndia.net | CarsBikes.net | CarsBikes.org | CashIndia.net | ConsumerIndia.net | CookingIndia.net | DataIndia.net | DealIndia.net | EmailIndia.net | FirstTablet.com | FirstTourist.com | ForsaleIndia.net | IndiaBody.Com | IndiaCab.net | IndiaCash.net | IndiaModel.net | KidForum.net | OfficeIndia.net | PaysIndia.com | RestaurantIndia.net | RestaurantsIndia.net | SaleForum.net | SellForum.net | SoldIndia.com | StarIndia.net | TomatoCab.com | TomatoCabs.com | TownIndia.com
Interested to Buy Any Domain ? << Click Here >> for more details...


define stator,rotor,excitor,rotating rectifier in generator?



define stator,rotor,excitor,rotating rectifier in generator?..

Answer / solanki

STATOR-
stator is the main construction part of ac & dc
machine.normally it consist of field winding and this part
is stationary but if talk abt generator then some times
stator consist of armature winding...
rotor-
as its name suggest it is the rotating part of ac machine
.it made up of silicon steel & consist of armature winding.
exciter-
Generators require direct current to energize its magnetic
field. The DC field current is obtained from a separate
source called an exciter. Either rotating or static-type
exciters are used for AC power generation systems. There are
two types of rotating exciters: brush and brushless. The
primary difference between brush and brushless exciters is
the method used to transfer the DC excditing current to the
generator fields. Static excitation for the generator fields
is provided in several forms including field-flash voltage
from storage batteries and voltage from a system of
solid-state components. DC generators are either separately
excited or self-excited.

Excitation systems in current use include direct-connected
or gear-connected shaft-driven DC generators, belt-driven or
separate prime mover or motor-driven DC generators, and DC
supplied through static rectifiers.

The brush-type exciter can be mounted on the same shaft as
the AC generator armature or can be housed separately from,
but adjacent to, the generator. When it is housed
separately, the exciter is rotated by the AC generator
through a drive belt.

The distinguishing feature of the brush-type generator is
that stationary brushes are used to transfer the DC exciting
current to the rotating generator field. Current transfer is
made via rotating slip rings (collector rings) that are in
contact with the brushes.

Each collector ring is a hardened-steel forging that is
mounted on the exciter shaft. Two collector rings are used
on each exciter, each ring is fully insulated from the shaft
and each other. The inner ring is usually wired for negative
polarity, the outer ring for positive polarity.

A rotating-rectifier exciter is one example of brushless
field excitation. In rotating-rectifier exciters, the
brushes and slip rings are replaced by a rotating,
solid-state rectifier assembly. The exciter armature,
generator rotating assembly, and rectifier assembly are
mounted on a common shaft. The rectifier assembly rotates
with, but is insulated from, the generator shaft as well as
from each winding.

Static exciters contain no moving parts. A portion of the AC
from each phase of generator output is fed back to the field
windings, as DC excitations, through a system of
transformers, rectifiers, and reactors. An external source
of DC is necessary for initial excitation of the field
windings. On engine driven generators, the initial
excitation may be obtained from the storage batteries used
to start the engine or from control voltage at the switchgear.



rotating rectifier-
commutator of a dc machine is known as rotating rectifier
switch. which reverse the connection of external load ckt as
each reversal of current in armature.

Is This Answer Correct ?    11 Yes 2 No

Post New Answer

More Electrical Engineering Interview Questions

for distribution line ratio of x/r 1.<0.1 2.>10 3.>1 4.<0.01

3 Answers   HAL, HPPSC,


what is meant by negative conductor?

2 Answers  


how df/dt relay operates & how it works?

1 Answers  


how to calculate mf when meter and cTPT detail are given

0 Answers   IBM,


define frequency ?

14 Answers   KPTCL,


We have 420volts, Diesel gen-sets each 750kva 4nos. we are operating with bus bar duct having 10x150mm for each face 4nos. our question is what is the minimum gap required between each face? is there any satutory regulations?

1 Answers   Alliance One,


what is the correct method for the outdoor termination of 19/33 KV HT cable step by step?

0 Answers   Finolex,


Grounding. Dear all at one of my site we checked the amps at the earthing cable to the alternator it was found 125 to 130 A. at the neutal cable in same machine found 146A. in the same plant checked the earthing current on other alternator it was 52A, and neutral 116 A. we are facing problems with our controller and the card was damaged once. can that neutral/GND current be a reason? as there is common grounding for the Alternator,Brkr panel,Transformer?

2 Answers  


We are using 4 MVA transformer and we provided 2 separate earthing pit for Body and 2 separate earthing pit for neutral, can we connect separate body earthing pit to other earthing pit (Equipment earthing)?

1 Answers  


What magnetic circuit is formed in berry-type constructions and why?

0 Answers  


How to identify Motor leads in their order coming out from winding without tag (U1, V1, W1 & U2, V2, W2)?

6 Answers   ABB,


Why motor is not calculated in kva, whereas transormers are calculated in kva

2 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5086)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4456)
  • Electrical Engineering Interview Questions Electrical Engineering (16639)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)