U
SER MANUAL
–
ENERIUM
100/200/300
MS1-7352 ENERIUM100/200/300_ Ed04 User Manual
Page 79 / 86
The measurements are derived from the harmonics already calculated, order by order, “averaged over
a second”, according to the following formula:
•
When the phase voltage, line voltage or the current is 0, then the total harmonic distortion of the
quantity involved is not calculated and is 0.
22.16 Energy and energy metering
Products calculate the "averaged over a second" real energy EP[1s], reactive energy EQ[1s] and
apparent energy ES[1s].
The measurements are derived from other measurements already calculated, according to the following
formula:
•
X = P, Q or S
Energies are measured in absolute values and are always positive.
M is the measured quantity "averaged over a second" (Real, reactive and apparent). N
ech
is the number
of samples collected during the sampling window. F
ech
is the sampling frequency.
Depending on the quadrant, the measured energy is added to a total counter.
•
If P[1s] is positive, the energy measure EP[1s] is added to the real energy meter active in receiver
mode CEP
R
and the energy measure ES[1s] is added to the apparent energy meter in receiver
mode CES
R
.
•
If P[1s] is negative, the energy measure EP[1s] is added to the real energy meter active in
generator mode CEP
G
and the energy measure ES[1s] is added to the apparent energy meter in
generator mode CES
G
.
•
If P[1s] and Q[1s] are both positive, the energy measurement EQ[1s] is added to the reactive
energy meter in the first quadrant, CEQ
1
. If P[1s] is negative and Q[1s] is positive, the energy
measurement EQ[1s] is added to the reactive energy meter in the second quadrant, CEQ
2
. If P[1s]
is positive and Q[1s] is negative, the energy measurement EQ[1s] is added to the reactive energy
meter in the fourth quadrant, CEQ
4
. If P[1s] and Q[1s] are both negative, the energy measurement
EQ[1s] is added to the reactive energy meter in the third quadrant CEQ
3
.
It is possible to reset all the energy counters to zero by sending a command word via local or remote
communication. It is also possible to reset the value of one counter independently of another, once
again by sending a command word via local or remote communication.
22.17 Unbalance
The monitors calculate the unbalance voltage ratio, called Uvr[1s], every second, from measurements
of line voltages "averaged over a second" and in accordance with the following algorithm:
•
Calculate Fact1 and Fact2, such that:
o
o
•
Calculate Fact3, such that:
o
If
o
Then
o
Else
•
Calculate Fact4, such that:
2
1
50
2
2
100
H
H
THD
n
n
∑
=
×
=
ech
ech
F
N
s
M
s
EX
×
×
=
3600
]
1
[
]
1
[
]
1
[
]
1
[
]
1
[
1
2
31
2
23
2
12
s
U
s
U
s
U
Fact
+
+
=
]
1
[
]
1
[
]
1
[
2
4
31
4
23
4
12
s
U
s
U
s
U
Fact
+
+
=
0
)
2
6
1
3
(
2
<
×
−
×
Fact
Fact
0
3
=
Fact
2
6
1
3
3
2
Fact
Fact
Fact
×
−
×
=
