MI 2893 / MI 2892 / MI 2885
Measurement methods
189
Total displacement power factor (vector):
fundtot
fundtot
tot
Sv
P
DPFv
.
(50)
All fundamental power measurements are calculated from fundamental voltages and currents obtained
from harmonic analysis (see section 5.1.8 for details).
Total Arithmetic fundamental power measurements
Standard compliance: IEC 61557-12 Annex A and IEEE STD 1459-2010 Section 3.2.2.5
Total Arithmetic fundamental active, reactive and apparent power and total displacement arithmetic
power factor are calculated according to the following equation:
Total fundamental active power:
3
2
1
fund
fund
fund
fundtot
P
P
P
P
[W],
(51)
Total apparent power (arithmetic):
𝑆𝑎
𝑓𝑢𝑛𝑑𝑡𝑜𝑡
= 𝑆
𝑓𝑢𝑛𝑑1
+ 𝑆
𝑓𝑢𝑛𝑑2
+ 𝑆
3𝑓𝑢𝑛𝑑
[VA],
(52)
Total nonactive power (arithmetic):
2
2
fundtot
fundtot
fundtot
P
Sa
Qa
[var],
(53)
Total power factor (arithmetic):
fundtot
fundtot
tot
Sa
P
DPFa
.
(54)
All fundamental power measurements are calculated from fundamental voltages and currents obtained
from harmonic analysis (see section 5.1.8 for details).
5.1.7
Energy
Standard compliance: IEC 62053-21 Class 1S, IEC 62053-23 Class 2 ... MI 2893/MI 2892
Standard compliance: IEC 62053-21 Class 1, IEC 62053-23 Class 2 ... MI 2885
Energy measurement is divided in two sections: ACTIVE energy based on active power measurement
and REACTIVE energy, based on fundamental reactive power measurement. Each of them has two
energy counters for consumed and generated energy.
Calculations are shown below:
Active energy:
Consumed:
m
i
p
p
i
T
i
P
Ep
1
)
(
)
(
[kWh], p: 1,2,3, tot
Generated:
m
i
p
p
i
T
i
P
Ep
1
)
(
)
(
[kWh], p: 1,2,3, tot
(55)
Reactive energy:
Consumed:
m
i
pCap
m
i
Iind
p
i
T
i
Q
i
T
i
Q
Eq
1
1
)
(
)
(
)
(
)
(
[kvarh], p: 1,2,3, tot
Generated:
m
i
pInd
m
i
pCap
p
i
T
i
Q
i
T
i
Q
Eq
1
1
)
(
)
(
)
(
)
(
[kvarh], p: 1,2,3, tot
(56)
