
23-11Power Factor Measurement
23.3.4.3 Power Calculations
Calculating
po
wer
de
livered
to do wo
rk
fo
r
a no
nlinear
lo
ad
is so
mewhat
mo
re
co
mplicated
th
an
if th
e
current were sinusoidal. If the fundamental component of the voltage at frequency f is taken as a refer-
ence
(t
he
a-
phase
fu
ndamental
fo
r
a po
lyphase
sy
stem),
th
e
su
bscript
“1
”
me
ans
th
e
fu
ndamental,
an
d
Ed
enotes
t
he
p
eak
v
alue
o
f
t
he
v
oltage;
t
hen,
t
he
v
oltage
c
an
b
e
e
xpressed
a
s
ε π
a1(t) a1
= + °E ftsin( )2 0
e voltage fundamental will then have an amplitude E
a1
and pass through zero in the positive-going
di
rection
at ti
me
t = 0. If h = ha
rmonic
nu
mber,
an
d
E
h
and I
h
are peak amplit