Answer / shiv

when there is no excitation ther will be no magnetic field
setup as a result of which no EMF will be induced which
means there is no output available from the generator.

Answer / sunil kumar sinha

If the excitation of generator is lost, it will continue to
generate power by taking excitation from grid. The flux
will pass through the surface of rotor which will cause
excessive heating of rotor. Further, around moon slots the
current will jump and may cause over heating around moon
slots of generator rotor beyond limits.

There is possibility of insulation failure of rotor winding
if operated for longer period at higher load, hence loss of
excitation relay is a must protection for generator. This
relay is further monitered by excitation supervision relay
in many of sets.

Answer / jagatheesan k

if excitation lost generator will draw power from grid(ie.,it draws reactive power from grid)and run as induction generator(runs at a speed more than synchronous speed) .

Answer / gunnam santosh

if excitation is removed also it will induce a small emf as
we basically use eletromagnets it contains some residual flux.

Answer / rajasekhar

am takin a synchronous generator
in general a syn. gen operates on prinicipal of synchronism
which obtains when we excite it with any other source ...if
directly excitation is lost there wil not be any alternating
flux which plays a main role with out no operation takes place

Answer / om prakash

If the excitation of generator is lost, than emf will not
be induced in alternator. Than we need to do excited
alternator by Outer DC voltage.

Answer / umesh

in the generator the exitation is the main source to
genrate the EMF, whenever the exitatio got lost then there
is no magnetic field, NO EMF will be built,

why all transformer colour is same?

3 Answers   OPTCL,

what is the charging battery current of 80 kva UPS/100AH bocket make battery.

4 Answers  

Where the ON LOAD TAP CHANGER is provided in the setp up transformer?

2 Answers  

Why short ckt does not happen when solenoid coil connected to supply. as its a wire only.

1 Answers   Siemens,

what is a tri vector meter? what are the tri vectors?

2 Answers  

when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

0 Answers   Godrej,

Explain with example of functional requirements of protection relay in terms reliability, selectivity, sensitivity

0 Answers   NCC,

what diferent amoung three phase supply?

1 Answers  

Safety of on line ups

0 Answers   Bhushan Power Steel, GE,

1. what type of winding of slip ring ac induction motor rotor and why. 2. how the heating element use in two phase (415 volt)and what rating of element, you prefered.

1 Answers   Simbhaoli Sugars,

How would you relate your key competencies to this position?

0 Answers  

How to decide the input and output circuit breaker for a 1600kva transformer.Is there any calculation is involved.

5 Answers