Question { ABC, 168323 }

working of a diesel generator.

Answer

Diesel Generator is a set of engine and alternator.
(Which converts mechanical energy in to electrical energy)
here engine is using for rotating the shaft(prim mover or
crank shaft).
Rotation takes place as fallows:
1)The pistons placed in cylinders and these pistons are
connected to Crank shaft through connecting rads
2)By using diesel as a fuel the blasting takes place in
cylinders, this blasting energy can be converted in to
rotation through piston,connecting and crank shaft
3)this rotor speed strength(should be synchronous
speed)depends on firing order of the cylinders (of course on
number of poles on rotor)
4)this shaft is connected to Alternator rotor
5)this rotor contains poles, this rotor will get the D.C
supply from A.V.R through Exciter (RRA: Rotating Rectifier
assembly, it is a converter bridge)
6)So with rotor(poles) rotation the EMF will induce in main
Stator(Faraday's law of electro magnetic effect)
7)A.V.R out put depends on load effect on D.G.
((for further full detail call me at 09458490849)

Question { HP, 17548 }

what is function of pump in DG?

Answer

D.g pump means it is not a pump it is FIP- FUEL INJECTING PUMP.
The main use of the FIP is supplying the fuel to the
cylinders to maintain crank shaft speed as a Synchronous
speed(1500rpm)
USE;
1)FIP- IT IS USED FOR MAINTAIN SYNCHRONOUS SPEED
2)PRIMING PUMP - FOR OIL CIRCULATION IN HIGH RATING D.G

Question { 8022 }

Why power factor does not occur in DG set ?

Answer

Ramya you are answer is good






Viswanath
Electrical ENGG., U.K

Question { Samtel, 6627 }

How I design capacitor bank for different load.7MW
connected load.

Answer

the capacitor bank depends on the load type
1. for resistive load no need cap.bank
2.and the cap.bank calculation depends on the Power factor

(for inductive loads 0.8 pf lag)
if u want clear calculation mail me with all load perticulars
mail id: viswaeee60@gmail.com

Question { 6750 }

What are the reasons for AVR failure in LT DGsets ?

Answer

In lt DG there is no P.F controller. AVR is controlling only
voltage (Automatic voltage regulator)
so in this case AVR get failure.

thanku