8.5 Calculation Formulas
157
8
Wiring Configu-
ration
Parameter
Single-
Phase
2-Wire
*1
Single-Phase
3-Wire
Three-phase, 3-wire Three-Phase 4-Wire
1P2W 1P3W 3P3W2M 3P3W3M 3P4W 3P4W2.5E
Current (1/2)
I(1/2) [Arms]
I
1
I
1
I
2
I
1
I
2
I
3
(I
3s
=-I
1s
-I
2s
)
(I1s+I2s+I3s = 0
are assumed)
I
1
I
2
I
3
Current
I [Arms]
I
1
I
1
I
2
I
1
I
2
I
3
(I
3s
=-I
1s
-I
2s
)
(Assuming
I
1s
+I
2s
+I
3s
= 0)
I
1
I
2
I
3
I
1
I
2
I
3
I
4
(I
4s
=I
1s
+I
2s
+I
3s
)
• Subscript definitions
c: Measurement Channel (1 to 3 ), 1, 2, 3: Measurement Channel, M: Sample count, s: Sample point
number
,
ave: average of multiple channels; sum: sum of multiple channels
• Variable definitions
I: line current, u: phase voltage from virtual neutral
*1.Formulas that apply to inputs 1 to 3 for single-phase wiring also apply to c in other wiring
configurations.
Iave
I
1 I2+
2
--------------
=
Iave
I
1 I2 I3++
3
-------------------------
=
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