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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
Root Mean Square (RMS) of Phase to Neutral Voltages: n = number of samples
For Wye: x = an, bn, cn
=
V
RMS
x
Root Mean Square (RMS) of Currents: n = number of samples
For Wye: x=a, b, c, n
For Delta: x = a, b, c
=
I
RMS
x
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
=
V
RMS
xy
For Delta: xy = ab, bc, ca
=
V
RMS
xy
e
Electro Industries/GaugeTech
n
∑
2
v
x
(
t
)
=
t
1
n
n
∑
2
i
x
(
t
)
=
t
1
n
n
∑
−
2
(
v
v
)
x
(
t
)
y
(
t
)
=
t
1
n
n
∑
2
v
xy
(
t
)
=
t
1
n
Doc # E107706 V1.25
2-6
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