METREL MI 2885, Manual

Page: 188 / 241

MI 2893 / MI 2892 / MI 2885 Measurement methods
188
Total active power:
3 2 1
P P P P
tot
  
[W], (39)
Total nonactive power (vector):
3 2 1
N N N N
tot
  
[var],
(40)
Total apparent power (vector):
2 2
tot tot tot
N P Sv
 
[VA],
(41)
Total power factor (effective):
tot
tot
tot
Sv
P
PFv

.
(42)
Total Arithmetic combined power measurements
Standard compliance: IEC 61557-12 Annex A and IEEE STD 1459-2010 Section 3.2.2.5
Total Arithmetic combined (funda nonfundamental) active, nonactive and apparent power and
total power factor are calculated according to the following equation:
Total active power:
3 2 1
P P P P
tot
  
[W],
(43)
Total apparent power (arithmetic):
3 2 1
S S S Sa
tot
  
[VA],
(44)
Total nonactive power (arithmetic):
2 2
tot tot
tot
P Sa Na
 
[var],
(45)
Total power factor (arithmetic):
tot
tot
tot
Sa
P
PFa

.
(46)
Fundamental phase power measurements
Standard compliance: IEEE STD 1459-2010
All Classic fundamental phase power measurements are identical with Modern fundamental phase
power measurement. See 5.1.5 section Fundamental phase power measurements for details.
Total Vector fundamental power measurements
Standard compliance: IEC 61557-12 Annex A and IEEE STD 1459-2010 Section 3.2.2.6
Total Vector fundamental active, reactive and apparent power and total displacement vector 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],
(47)
Total fundamental reactive power (vector):
3 2 1 fund fund fund
fundtot
Q Q Q Q
  
[var],
(48)
Total fundamental apparent power (vector):
𝑆𝑣
𝑓𝑢𝑛𝑑𝑡𝑜𝑡
= √𝑃
𝑓𝑢𝑛𝑑𝑡𝑜𝑡
2
+ 𝑄
𝑓𝑢𝑛𝑑𝑡𝑜𝑡
2
[VA],
(49)