GE Grid Solutions Multilin 9450 - Page 30

2–8 EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL
MEASUREMENTS AND CALCULATIONS CHAPTER 2: METER OVERVIEW
For Delta:
Apparent Power (VA) Total:
For Wye:
For Delta:
Power Factor (PF):
For Wye: x = a,b,c,T
For Delta: x = T
Phase Angles:
x = a, b, c
% Total Harmonic Distortion (%THD):
For Wye: x = v
a
, v
b
, v
c
, i
a
, i
b
, i
c
For Delta: x = i
a
, i
b
, i
c
, v
ab
, v
bc
, v
ca
K Factor: x = i
a
, i
b
, i
c
RVI
vi
N
TRMSRMS
ab t a t
t
N
ab a
=•
()
−
•
⎡
⎣
⎢
⎢
⎢
⎢
⎤
⎦
⎥
⎥
⎥
⎥
=
∑
2
1
2
() ()
VI
vi
N
RMS RMS
bc t c
t
N
bc c
•
()
−
•
⎡
⎣
⎢
⎢
⎢
⎢
=
∑
2
1
() (
+
VA VA VA VA
Tabc

VA W VAR
TT T

22
x
x
x
W
PF
VA
=
()
1
cos
x
x
PF
−
∠=
()
1
127
2
2
h
x
h
x
RMS
THD
RMS
=
=
