Power Quality Logger
Measurement
Theory
39
1
1
P
Ph
bas
=
Active power of logging
interval per phase
∑
=
⋅
=
M
j
j
bas
P
M
P
1
1
P
bas j
to 200 ms value
M: Number of 200 ms intervals per logging
intervals
Total active power on all
three phases
∑
=
=
3
1
k
k
total
P
P
P
k
: Active power of the phase
k: Phase (k = 1, 2, 3)
Absolute value of the
active power per interval
per phase
∑
=
⋅
=
M
j
j
bas
betr
P
M
P
1
1
Sum of the absolute
values of the active
power on all three phases
∑
=
+
+
=
M
j
bas
bas
bas
total
betr
P
P
P
M
P
1
3
2
1
1
Apparent power based on
RMS values of voltage
and current. Basic values
on 200 ms per phase
bas
bas
bas
I
V
S
.
=
Apparent power per
logging interval per phase
∑
=
⋅
=
M
j
j
bas
S
M
S
1
1
S
bas j
: 200 ms value
M: Number of 200 ms intervals per logging
intervals
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