GE Grid Solutions Multilin 9450 - 2.6 Measurements and Calculations

2–6 EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL
MEASUREMENTS AND CALCULATIONS CHAPTER 2: METER OVERVIEW
• Host: IP Address (per your network administrator). Example:
10.0.0.1
• Network Port: 502
•Protocol: Modbus TCP
• Click the Connect button at the bottom of the screen. GE Communicator
connects to the meter via the Network settings you entered.
2.6 Measurements and Calculations
The EPM 9450/9650 meter measures many different power parameters.
Following is a list of the formulas used to perform calculations with samples for Wye and
Delta services.
Samples for Wye: v
a
, v
b
, v
c
, i
a
, i
b
, i
c
, i
n
Samples for Delta: v
ab
, v
bc
, v
ca
, i
a
, i
b
, i
c
Root Mean Square (RMS) of Phase Voltages: N = number of samples
For Wye: x = a, b, c
Root Mean Square (RMS) of Line Currents: N = number of samples
For Wye: x =a, b, c, n
For Delta: x = a, b, c
Root Mean Square (RMS) of Line Voltages: N = number of samples
For Wye: x, y= a,b or b,c or c,a
For Delta: xy = ab, bc, ca
V
v
N
RMS
xt
t
N
x



()
2
1
I
i
N
RMS
xt
t
N
x



()
2
1
V
vv
N
RMS
xy
t
N
xy
tt




()
() ()
2
1