Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / suresh
The power factor of an AC electric power system is defined
as the ratio of the real power flowing to the load to the
apparent power [1] [2], and is a number between 0 and 1
(frequently expressed as a percentage, e.g. 0.5 pf = 50%
pf). Real power is the capacity of the circuit for
performing work in a particular time. Apparent power is the
product of the current and voltage of the circuit. Due to
energy stored in the load and returned to the source, or due
to a non-linear load that distorts the wave shape of the
current drawn from the source, the apparent power can be
greater than the real power.
In an electric power system, a load with low power factor
draws more current than a load with a high power factor, for
the same amount of useful power transferred. The higher
currents increase the energy lost in the distribution
system, and require larger wires and other equipment.
Because of the costs of larger equipment and wasted energy,
electrical utilities will usually charge a higher cost to
industrial or commercial customers where there is a low
power factor.
Linear loads with low power factor (such as induction
motors) can be corrected with a passive network of
capacitors or inductors. Non-linear loads, such as
rectifiers, distort the current drawn from the system. In
such cases, active power factor correction is used to
counteract the distortion and raise power factor. The
devices for correction of power factor may be at a central
substation, or spread out over a distribution system, or
built into power-consuming equipment.
| Is This Answer Correct ? | 29 Yes | 3 No |
Post New Answer View All Answers
what is parellel power factor correction?
does buccholz in a transformer use batteries
Can any one give an explanation about rating factors of cable? if we are laying the cable on the air with an temp 15 degree then rating factors will be 1.15 and if we are laying the cable on the air an temp 60 degree then rating factor will be 0.76 please describe it and what is the difference between rating factor and derating factor?
what is the easiest method of short circuit current calculation ? pls. derive with a mathematical example in real life application.
Batteries. What is the difference between Lead and Nickel batteries ?
Where voltage are high and current to be interrupted is low the breaker preferred is:
Main advantage of auto transformer over two windings transformer is that A it needs no cooling B it uses only one winding C core losses are reduced D it has simple construction
11 kV line deraction check by an Engineer.
A 1F capacitor is charged to 100V initially. A 1H inductor is connected accros the capacitor througha a switch. The current in the circiut when the switch is closed is____
please tell me how a surge protector work on a DC 48Volt.? please describe briefly.
Explain the terms real power, apparent power and reactive power for ac circuits and also the units used.
What is the IS standard for MCCB to be use (As per capacity of AMP)& for ACB also.
diff b/w elcb and rccb
hi friends how 3 phase converter functioning ?what is working principle of rotory phase converter ?
What are the advantages of nichols chart?
