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whu does the power factor of diesel generator always be 0.8.
please explain
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Answer Posted / 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.
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