Interested to Buy Any Domain ? << Click Here >> for more details...
wat is the difference between real power and reactive
power..which is useful..?and how it s useful..wat is the
effect of these on a power system...
- 10 Answers
- 24641 Views
- ABB, I also Faced
- E-Mail Answers
Answer Posted / vasanth kumar s m
Alternating current
In alternating current circuits, energy storage elements
such as inductance and capacitance may result in periodic
reversals of the direction of energy flow. The portion of
power flow that, averaged over a complete cycle of the AC
waveform, results in net transfer of energy in one
direction is known as real power (also referred to as
active power). That portion of power flow due to stored
energy, that returns to the source in each cycle, is known
as reactive power.
Power triangle The components of AC powerThe relationship
between real power, reactive power and apparent power can
be expressed by representing the quantities as vectors.
Real power is represented as a horizontal vector and
reactive power is represented as a vertical vector. The
apparent power vector is the hypotenuse of a right triangle
formed by connecting the real and reactive power vectors.
This representation is often called the power triangle.
Using the Pythagorean Theorem, the relationship among real,
reactive and apparent power is:
(apparent power)2 = (real power)2 + (reactive power)2
Real and reactive powers can also be calculated directly
from the apparent power, when the current and voltage are
both sinusoids with a known phase angle between them:
(real power) = (apparent power) * cos(theta)
(reactive power) = (apparent power) * sin(theta)
The ratio of real power to apparent power is called power
factor and is a number always between 0 and 1.
To know the Power Triangle & the above concept here is the
hyperlink for this sub:
http://en.wikipedia.org/wiki/Power_factor#Importance_of_powe
r_factor_in_distribution_systems
| Is This Answer Correct ? | 26 Yes | 6 No |
Post New Answer View All Answers
is there any role of power factor with frequency variation? and how we can manage the frequency variation?
how can i apilly for electrical c licencese.sir,i completed B.Tech in electrical & electronics engineering in 201onot working any company
why dc is used in control circuits for MV & LV switchgeras instead of ac
how you will decide the distance between the power transformer and its fencing
what is resver in electrical enginnering with answer
what kn of disc is used in 33kv,132kv,220kv,400kv,800kv transmission line
checking procedure of capacitor based motors.used in fans etc?
what should be the ideal gauge of wire (In sq mm) for different loads in Ampere?
What is the power factor of an alternator at no load?
What are the causes for the failures of sandwich type (Al) busducts?
What are the specifications for conducting earth leakage test as per IEC standard?
What is the basic rule for block diagram reduction technique?
Is neutral transformer can be called as control transformer?
why we use four type of phase angle difference between pimary & secondry winding of a transformer & where we use them?
What is dynamo?How it works and what is the function of dynamo in a DG.
