power factor angle f. The in-phase component of I is I cos f and quadrature component is I sin f,
as shown in Figure 3.9(a).
f
I
sinf
I cosf
I
(a)
(b)
V
f
I sinf
I cosf
C
AB
I
V
f
kVI sinf
kVI cosf
kVI
C
B
A
f
P=kW
S=kVA
Q=kVAR
C
B
A
Figure 3.9 Power Triangle Diagram Developed from Voltage–current Relationship
(a) Voltage–current Relationship and (b) Power Triangle
By multiplying all the sides of triangle ABC by kV (kilo-volt), we can draw the power triangle
as in Figure 3.9(b).
kVAk
W
kV
Ak
VAR
cos
sin
f
f
=
=
Active and Reactive Power
In the power triangle diagram, if f is taken as zero, that is, if the circuit is resistive, reacti ...
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