what is pf. how to calculate capacitor bank value to
maintain unity pf.
Answer Posted / ezzuddin
The correct answer and below is the proof of the formula:
KVAR= KW X [Sqrt(1–(CosQ)^2)]/CosQ;
The proof:
Pythagoras Theorem states that in a right-angled triangle
the square of the hypotenuse is equal to the sum of the
squares of the other two sides.
so that:
C is the hypotenuse.
S is the opposite.
P is the adjacent.
TanQ= opposite/adjacent = S/P -----> S=P x(TanQ;)
Pf=CosQ;= adjacent/hypotenuse = P/C ---->C=P/CosQ;
Pythagoras said that:
C^2= P^2 + S^2
P^2/(CosQ)^2= P^2 + (P^2 x (TanQ)^2)
by divide P^2:
1/(CosQ)^2 = 1 + (TanQ)^2
by changing the both sides:
(TanQ)^2 = (1/(CosQ)^2) - 1
(TanQ)^2 = (1/(CosQ)^2) - ((CosQ)^2/(CosQ)^2)
by Taking the (1/(COSQ)^2) Common factor:
(TanQ)^2 = {1/(CosQ)^2)} x ( 1 - (CosQ)^2)
by taking the square root:
TanQ; = [Sqrt(1–(CosQ)^2)]/CosQ;
so that:
KVAR = KW x [Sqrt(1–(CosQ)^2)]/CosQ;
Is This Answer Correct ? | 4 Yes | 1 No |
Post New Answer View All Answers
What is ideal IR values for ground and neutral.
WHAT IS THE TOTAL POWER GENERATION IN CHHATTISGARH?
What is mason's gain formula?
what are symmetrical and non symmetrical components in electrical installation.
In what condition the HT fuse breakes?
what is meant by directional earth fault and non directional earth fault? describe both.
describe the fully control circuit diagram of ac drives
What is the effect on power factor, shown by a trivector meter; incase of reverse phase sequence. If the power factor of a system is lag what meter will show in case of reverse phase sequence connected to the meter. and What in case of lead.
where reactive power is used
We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.
As i want some model question paper in basic computer science and history please send me immediately sir
Is there any specialised book to refer about fault level calculation both in MV and LV side??
if an insulated power and control cables of a running gas diesel gensets laid direct in an open trench i.e, trench bed is not rcc of a power house in which rain water, spillage water alwas exists and all power control cables remains submerged even when gas gensets of 480 kw each runningin on load. These power &control cables runs from power house to switchgear room through these trenches in which water remains most of the time. pl explain its merit & de-merit
What is electrical diversity factor in electrical installations?
What is Meter MF if External CT Ratio is 150/1 , PT Ratio is 132/110 Meter CT Ratio is 200/1 & Meter PT Ratio is 110/1