D.G. - P.F.

D.G. = ????

DG = Deisel Generator?

Diesel Generator

when we start plant on D.G. that time we Tripp the Capacitor bank. if we does not tripping bank than our main supply incomer Air Circuit Breaker Tripp.

Yes Diesel Generator

when we start plant on D.G. that time we Tripp the Capacitor bank. if we does not tripping bank than our main supply incomer Air Circuit Breaker Tripp.We can not improve d.g. p.f.? Our D.G. is 1000 KVA & P.F. is 0.80p.f.

You are using Capacitors when the EB supply is on probably because of Low PF.However with Diesel generating set the PF is normally 0.86 and hence u are not connecting the capacitor bank.If PF Is low with DG supply on then u need to use the capacitor bank .I presume you are using a centralized capacitor bank.If Individual capacitors are used on each equipment it may still be used .Other reason could be u may be using a HT capacitor bank centrally and DG being LT it may be cut off .Any way whether DG Or Mains supply PF determines use of capacitors.U may have to give more details to go in Depth

Thank You For replying

Sir actually we have 1000 KVA D.G. When we start the plant on D.G. that time suppose we does not Tripp the capacitor bank than our main Air Circuit breaker tripped so we always off the bank when our D.G. started. & its see in many company's they also doing like that.

Does your DG come up to speed then transfer onto the system?

If so, and there will be a significant inrush to the caps.

Alternator of Diesel Generators systems are rated for 0.8pf Lag. We can not add uncontrolled reactive ( Capacitive ) compensation for DG. If in case of power factor of system goes to leading, then there is every chance failure of windings. hence usually all capacitor banks will be provided electrical interlocks to protect the DG.

Pls note that kW output from the DG is at 800kW, Only we can get the KVA benefit

if we add capacitors. Detailed study of the system is very important before we do take any changes in system.

What will be the effect of capacitor bank on DG engine. Will it overload the engine resulting in overheating / other problems.