YOKOGAWA WT3002E User Manual

6-3
IM WT3001E-51EN
Delta Computation
1
2
3
4
5
6
7
8
9
10
11
12
13
Index
Explanation
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]
I
R
S
T
U
U
I
N
I1
I2
U2
U1
UrsA
ItA
6.2 Setting the Delta Computation

YOKOGAWA WT3002E Specifications

General

Brand	YOKOGAWA
Model	WT3002E
Category	Measuring Instruments
Language	English