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13.1: Measurements and Calculations
The Nexus® 1262/1272 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
I
RMS
XY
Electro Industries/GaugeTech
Chapter 13
Nexus® Meter Calculations
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
Doc # E151701
13-1
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