Question { 4747 }

some practicle study shows that the reactive power at the
receiving end is not equal to the reactive power at the
sending end.But according to theory the reactive power is
exchanged by different parts of the network – capacitors
and reactors permanently, but is never consumed or produced.
Then Where that reacrtive power loss occuring?is there any
formula to calculate reactive power loss?

Answer

mahesh i am not asking about active power loss i am asking
abt reactive power loss when we say that reactive elements
never consume any energy then y reactive power at the
receiving end is not equal to the reactive power at the
sending end

Question { Bhel, 37389 }

wat is the importance of reactive power in power
generation.....if it is zero means wat will happen to
system........

Answer

Electrical machines work on the principle of conversion of
electromagnetic energy.A part of input energy is consumed
for creating and maintaining the magneticfield.This part of
the input energy cannot be converted into active energy and
is returned to the electrical network on removal of the
magnetic field. This power is known as “reactive” power Q.
The Q Power flows back and forth, causing 90º Out of phase
shift between the current and voltage waveform.This
Reactive Power has one half of the Power In the positive
area and the other half in the negative area.
Unlike true power, reactive power is not useful power
because it is stored in the circuit itself.
This power is stored by
1)Inductors,
Because they expand and collapse their magnetic
fields in an attempt  to  keep  current  constant,   
2) Capacitors, Because  they  charge and  discharge  in  an
attempt  to  keep  voltage  constant.   

Question { Bhel, 37389 }

wat is the importance of reactive power in power
generation.....if it is zero means wat will happen to
system........

Answer

Inadequate reactive support
!
!
!
Which results in:
Voltage drops
Which results in:
Reduced reactive power from capacitors and line charging
Which results in:
Less reactive power support
Which results in:
Greater voltage drops
Which results in:
Tripping of generating units due to low auxiliary voltage
level generator field current limiters.

Question { Bhel, 37389 }

wat is the importance of reactive power in power
generation.....if it is zero means wat will happen to
system........

Answer

Importance of REACTIVE POWER:
Electrical machines work on the principle of conversion of
electromagnetic energy.A part of input energy is consumed
for creating and maintaining the magneticfield.This part of
the input energy cannot be converted into active energy and
is returned to the electrical network on removal of the
magnetic field. so this requirement of magnetic field by
machines is met by REACTIVE POWER.
what happens when reactive power is ZERO.
when the connected load to the system is purely Resistive
reactive power generation vl b ZERO.

Question { MacLellan, 20753 }

How to calculate the average power factor in 3 phase
unbalanced system

Answer

thanks, but cosider that R ph pf is 0.8,y-ph pf is 0.6,and
b ph pf is 0.7 what vlb the overall pf of three phase
unbalanced 3phase system .