Question { 7471 }

Re: can you give main difference between ELCB 2pole And RCCB
2pole? And how this devices operated?

Answer

ELCB= Earth leakage ckt breaker,
RCCB= Ressidual current ckt breaker

The functioning is same both gives protection against earth
leakge,, more over ELCB is replaced by RCCB in market.

Question { 34621 }

what is AVR in alternator how its work?

Answer

Automatic voltage regulator.

Question { 8902 }

WHAT IS PRINCIPLE OF TRANSFORMER

Answer

Transformer works om principle of MUTUAL INDUATION.

This can easily understand by this two laws.
1.PRODUCTION OF MAGNETIC FIELD WITH ELECTRIC CURRENT.
When an electric current flowing through any conductor it
not only produces heat but also magnetic filed arround the
wire & identified by placing needle near to the
condutcor.Intensity is increased by wound the wire in to
ring and amount of electric current flowing through the
wire.
2.PRODUCTION OF ELECTRIC CURRENT WITH MAGENTIC FIELD.
Whenever conductor is moving in the magentic field an EMF
will generated in the conductor and magnitude of the
voltage depends on the rate at which conductor moves..( DC
generator principle )

In primary winding magentic field is produced with the aid
of electric current whereas in the secondary winding
electric current ( EMF ) will produced with aid of magnetic
feild.

Question { 17255 }

What is C check in a diesel generator and what are parts
and what has to be done during the C check

Answer

C check is carried out along with A & B ,

B checks
Coolant level
Oil filter replacement.
Fuel filetr replacement.
Alernator terminals tightness checking.
Replacement of lubricating oil....etc

C checks.
Coolant level replacement.
Check the fuel injectors etc..

Its depends on the size of the DG sets , auxillary
system,freuency of mainttenance ...

Question { ABB, 18644 }

why generally transformer are in star to delta or delta to
star used?

Answer

Main purpose of using transformer is to convert the power,
Either from high to low or vice versa....i e step up or
Step down....for more deatils go through Power plant or
power system books.. Why transformer is neccessary in
transmission net work..n How the power will converted from
high voltage to low voltage..etc