Answer / ..................

when we say that DG set has 0.8 Power Factor it means
a 1000kVA DG shall deliver 800Watts only.
If we try to load more than this it shall drag more amount
of current. & Ultimately voltage will drop accordingly
resulting in generation of capacitive VARs.

Answer / kj

Most DG's are rated at 0.8 PF. They do not have to operate
at this PF but certain considerations must be taken into
account when the PF is changed.

1 - The kw available is only 80% of the kva rating. This is
limited by the output of the engine. If the load is at
unity PF the output is only 80% of the kva rating.
Otherwise the engine is overloaded.

2 - The maximum current the alternator windings are
designed to carry is the current at the kva rating. If the
PF is below 0.8 the kw load must be reduced to make up for
the extra kvar load so the kva is not above the rated
maximum.

Answer / premkumar

Normal to Design DG p.f is 0.8, some person say Dg set to use APFC with Dual sense Relay for EB and DG side to improve the DG efficiency. Its wright or Wrong.

Answer / thowsif_emerson

Fristly the design Power factor of the DG set is 0.8, i.e.
capacity of the DG can be used 80%, If you run the DG set
on higher power factor then DG set run on more excitation
due the more excitation the DG set goes to the Capacitive
load when the DG set run capcitve load then current lead to
the voltage. This is the losses of power.

Answer / sree

Generally at what power factor, DG sets in generating
stations operate ? presuming that the generators run at
0.8 PF, I think it is a loss. what do say?

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