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Doc # E107706 V1.25 2-6
2.6:
Measurements
and
Calculations
The Nexus 1250/1252 Meter measures many different power parameters. The following is a list of the
formulas used to conduct calculations with samples for Wye and Delta services.
Samples for Wye: v
an
, v
bn
, v
cn
, i
a
, i
b
, i
c
, i
n
Samples for Delta: v
ab
, v
bc
, v
ca
, i
a
, i
b
, i
c
Q
Root Mean Square (RMS) of Phase to Neutral Voltages: n = number of samples
For Wye: x = an, bn, cn
Q
Root Mean Square (RMS) of Currents: n = number of samples
For Wye: x=a, b, c, n
For Delta: x = a, b, c
Q
Root Mean Square (RMS) of Phase to Phase Voltages: n = number of samples
For Wye: x, y= an, bn or bn, cn or cn, an
For Delta: xy = ab, bc, ca
n
v
V
n
t
tx
RMS
x
∑
=
=
1
2
)(
n
i
I
n
t
tx
RMS
x
∑
=
=
1
2
)(
n
vv
V
n
t
tytx
RMS
xy
∑
=
−
=
1
2
)()(
)(
n
v
V
n
t
txy
RMS
xy
∑
=
=
1
2
)(