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
anyone knows service engineer in chennai for EDM SPARKING MACHINE.CHMER PULSE CD 60 M.pL GIVE ANY CONTACT NOS
Whats the difference btwn a latch, port,data bus buffer? Do they all not hold data in d flip flops??
How can we findout the maximum efficiancy of Transformer? At which load?
what will happen if OLR CT in all phases are short circuted
what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?
In HI POT test what is reason for applying the AC VOLTS and DC VOLTS in different applications what is the nessesity for this ?
What is the mmf,rgt and ngt please brief completely
what is per unit calculation?looking for simple and strong explanation thk u
why on axial hitting up of air blast on hydrogen produced in oil circuit breaker,temperature rises of the core of the arc?
What difference between ref protection and differential protection ?
what is the acceptable value of TAN DELTA and dissipation factor for 11kV, 1.75HP Motor?.
What the formula for calculating no.of earthings & size of earth strip for 100mX90m shop.
Dears we deal in Chemical are Plate earthing. Kindly call if any requirement and questions. Tech Earth Solutions Mohit Verma 8791071007
After synchronization with grid what is the demand value QKVAR and how we will maintain that?
in general it is observed in power stations, the tertiary winding is used in higher rating Y-Y auto transformer but not in Y-Y power transformer. is the tertiary winding is compulsory then why it is not using in power transformerÂ
