Equations for three-phase wiring groups
In the following table, subscript numbers refer to the channel number in the wiring group. For
example, V
2
is the voltage on leg 2. The subscript "n" means "neutral." For example, V
1n
is the
voltage from leg 1 to neutral.
Equations in table are shown for AC+DC meas mode and calculate RMS using the formula:
∑
RMS x
x
=
N
n
N
n
1
= 0
1
2
−
3P-3W-2M
3P-3W-3M
3P-4W-3M
Voltage as Wye
(
)
V
RMS v
=
−
n
v
v
1
1
+
3
1
2
(
)
V
RMS v
=
−
n
v
v
2
2
+
3
1
2
(
)
V
RMS
=
−
n
v
v
3
+
3
1
2
(
)
V
RMS v
=
−
n
v
v
1
1
−
3
1
2
(
)
V
RMS
=
−
n
v
v
2
−
3
1
2
(
)
V
RMS
v
=
−
−
n
v
v
3
2
−
3
1
2
V
RMS v
=
( )
x
x
(
)
V
V
V
V
=
+
+
/ 3
avg
n
n
n
1
2
3
(
)
V
V
V
V
=
+
+
/ 3
avg
1
2
3
Voltage as Delta
V
RMS v
=
( )
13
1
V
RMS v
=
(
)
23
2
V
RMS v
v
=
( −
)
12
1
2
V
RMS v
=
( )
12
1
V
RMS v
=
(
)
23
2
V
RMS v
=
(
)
31
3
V
RMS v
v
=
( −
)
12
1
2
V
RMS v
v
=
(
−
)
23
2
3
V
RMS v
v
=
(
−
)
31
3
1
(
)
V
V
V
=
+
/ 2
avg
13
23
(
)
V
V
V
V
=
+
+
/ 3
avg
12
23
31
Current
I
RMS i
=
( )
1
1
I
RMS i
=
( )
2
2
I
RMS
i
i
=
(− − )
3
1
2
I
RMS i
=
( )
3
3
(
)
I
I
I
=
+
/ 2
avg
1
2
(
)
I
I
I
I
=
+
+
/ 3
avg
1
2
3
I
RMS i
i
i
=
(
+
+
)
n
1
2
3
Power
P
AVG v
i
=
( * )
x
x
x
P
AVG v
i
=
(
* )
n
1
1
1
P
AVG v
i
=
(
*
)
n
2
2
2
P
AVG v
i
=
(
*
)
n
3
3
3
P
AVG v
i
=
( * )
x
x
x
P
P
P
=
+
sum
1
2
P
P
P
P
=
+
+
sum
1
2
3
Keysight IntegraVision PA2200 Series Power Analyzers Operating and Service Guide 119
