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Explanation
IM WT3001E-51EN
In the normal measurement of U and I, the sum or difference of the instantaneous
values (sampled data) of the voltage or current between the elements assigned to the
target wiring unit for the delta computation can be used to determine the measurement
functions, ∆U and ∆I. This operation is called delta computation. For the equations,
see section 6.3. The measurement period is the same as that described in section 2.2,
"Measurement Modes and Measurement Functions" in the User's Manual IM WT3001E-
01EN.
• Selecting the Delta Computation Type
You can select the delta computation type from the choices below. The selectable
items vary depending on the selected wiring system pattern.
Wiring system
Selectable delta computation type
1P3W
Difference, 3P3W>3V3A
3P3W
Difference, 3P3W>3V3A
3P4W
Star>Delta
3P3W(3V3A)
Delta>Star
• Difference
Computes the differential voltage and differential current between two elements.
When Difference is specified for wiring unit ΣA
∆F1[UdiffA]
∆F2[IdiffA]
When Difference is specified for wiring unit ΣB
∆F3[UdiffB]
∆F4[IdiffB]
• 3P3W>3V3A
Computes other data when the wiring system is changed from three-phase, three-wire
(3P3W) to three-voltage, three-current (3V3A).
When 3P3W>3V3A is specified for wiring unit ΣA
∆F1[UrsA]
∆F2[ItA]
When 3P3W>3V3A is specified for wiring unit ΣB
∆F3[UrsB]
∆F4[ItB]
R
I
I1
UrsA
N
S
T
I2
I
ItA
6.2 Setting the Delta Computation
U
U1
U
U2
1
2
3
4
5
6
7
8
9
10
11
12
13
Index
6-3
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