1.After synchronising the alternator to the grid,how we r
delivering power to the grid?if the i/p increases does the
speed hence frequency increases?
2.y the power factor is changing when exitation changes?what
is the relation with p.f and flux?
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Answer Posted / raul
after synchronising, the real power delivered by d
alternator is VI*p.f.........if the input increases, the
real power power will increase, there will b no effect on
speed n frequency........
when excitation changes, the reactive power changes which
is a function of p.f............
an alternator operates at lagging power factor when over-
excited and operates at leading power factor when under-
excited.........bcoz at leading power factor......the rotor
ampere turn increases and hence flux increases, thereby
increasing the induced voltage......so to keep the induced
voltage constant.........the excitation has to be
decreased..........n vice versa
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