GE Grid Solutions Multilin 9450 - Page 29

CHAPTER 2: METER OVERVIEW MEASUREMENTS AND CALCULATIONS
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 2–7
Power (Watts) per phase: N = number of samples
For Wye: x = a, b, c
Apparent Power (VA) per phase:
For Wye: x = a, b, c
Reactive Power (VAR) per phase:
For Wye: x = a, b, c
Active Power (Watts) Total: N = number of samples
For Wye:
For Delta:
Reactive Power (VAR) Total: N = number of samples
For Wye:
V
v
N
RMS
xy t
t
N
xy



()
2
1
W
vi
N
X
xt xt
t
N




() ()
1
XX
x
RMS RMS
VA V I
=•
22
x
xx
VAR VA W
=−
WWWW
Tabc

W
vivi
N
T
abt at bct ct
t
N

 



() () () ()
1
VAR VAR VAR VAR
Tabc
