7-44
IM WT3001E-51EN
Measurement Functions
during Harmonic Measurement
Method of Determination, Equation
(Table 3/3)
Σ
fu
nc
tion
Single-phase,
three-wire (1P3W)
Three-phase,
three-wire (3P3W)
Three-voltage,
three-current (3V3A)
Three-phase,
four-wire (3P4W)
P1 + P2 + P3
P
Σ
[W]
P1 + P2
UΣ
[V]
Wiring system
IΣ
[A]
(I1 + I2) / 2
(U1 + U2) / 2
(I1 + I2 + I3) / 3
(U1 + U2 + U3) / 3
P
Σ
2
+ Q
Σ
2
SΣ [VA]
Q1 + Q2
QΣ [var]
Q1 + Q2 + Q3
PΣ
SΣ
λΣ
(TYPE3)*
(TYPE3)*
* For details on the type of SΣ and QΣ equations, see section 5.9 in the
User’s Manual IM WT3001E-01EN
.
Note
• The numbers 1, 2, and 3 in the equations UΣ, IΣ, PΣ, SΣ, and QΣ indicate the case when
input elements 1, 2, and 3 are set to the wiring system shown in the table. If elements 2, 3,
and 4 are set to the wiring system shown in the table, replace the numbers 1, 2, and 3 with 2, 3,
and 4, respectively.
• For Σ, only the total value and fundamental wave (1st) are computed.
7.11 Harmonic Measurement Specifications
