what happan when ac power transmitted in unity power factor
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Answer Posted / seraj
If it is made possible to deliver AC power with unity power
factor, it would be most economical for the company as
there would be minimum line losses. Total current would be
active only contributing for watts.
The system stability will however be poor, as there will be
no cussion for variation in load. Be disconnection of a
large load, the system will go over voltage and over
frequency before the mechanical system of the connected
generators respond to decrease the load of the turbines.
similarly if a large load is at once connected to the
system, there will be instantaneous mismatch between inflow
and outflow of power. This will cause the system to go
under voltage and under frequency before the mechanical
system responds.
If power factor is less than unity, in both of the above
cases, the surge will be absorbed by the inductive cussion
(just like a flywheel in mechanical system) and the sytem
would be more stable.
So we can say power factor adjustment is a compromise
between economy and the stability of the system.
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