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Power Quality Logger
Logger Parameters with Function A
41
Logger Parameters with Function A
The following are the parameters of the 1744/1743 Logger with function A.
TRMS value of voltage
and current. Basic values
on 200 ms per phase.
∑
=
=
N
i
ibas
V
N
V
1
2
.
1
∑
=
⋅=
N
i
ibas
I
N
I
1
2
1
N: Number of samples in 200 ms intervals (2048)
RMS value of voltage and
current per logging
interval per phase
∑
=
=
M
j
basjRMS
V
M
V
1
2
.
1
∑
=
⋅=
M
j
j
bas
RMS
I
M
I
1
2
1
M: Number of 200 ms intervals per logging interval
Active power calculated
from FFT from samples
of voltage and current.
Basic value on 200 ms per
phase.
nnnn
IVP
ϕ
cos..=
V
n
: RMS value of voltage harmonics of order n
I
n
: RMS value of current harmonics of order n
n: Order of the harmonics
φ
n
: Phase angle between current and voltage
harmonics of order n
P
n
: Harmonics of the active power of order n
Fundamental
∑
=
=
50
1
n
nbas
PP
1
1 PPh
bas
=