User manual
4 Calculation formulas
55
Current crest factor
CFI
-
where the operator
expresses the highest abso-
lute value of current I
A
samples
i = 2048 for 50 Hz and 60 Hz
K-Factor
K-Factor
-
where I
h
is the h-th harmonic of current I
A
I
1
is fundamental component of current I
A
Harmonic active power
P
h
h=1..50
W
where U
h
is the h-th harmonic of voltage U
A-N
I
h
is the h-th harmonic of current I
A
h
is the angle between harmonics U
h
and I
h
Harmonic reactive power
Q
h
h=1..50
var
where U
h
is the h-th harmonic of voltage U
A-N
I
h
is the h-th harmonic of current I
A
h
is the angle between harmonics U
h
and I
h
Short-term flicker
P
st
-
calculated according to IEC 61000-4-15
Long-term flicker
P
lt
-
where P
STi
is subsequent i-th indicator of short-term
flicker
Active energy (consumed
and supplied)
E
P+
E
P-
Wh
where:
i is subsequent number of the 10/12-period measure-
ment window
P(i) represents active power P calculated in i-th measur-
ing window
T(i) represents duration of i-th measuring window (in
hours)
Budeanu reactive energy
(consumed and supplied)
E
QB+
E
QB-
varh
where:
i is subsequent number of the 10/12-period measure-
ment window
Q
B
(i) represents Budeanu active power Q
B
calculated in
i-th measuring window
T(i) represents duration of i-th measuring window (in
hours)