YOKOGAWA WT1800 User Manual page 112

Appendix 1 Symbols and Determination of Measurement Functions
Measurement Function
Wiring system
UΣ [V]
IΣ [A]
PΣ [W]
SΣ [VA]
(TYPE3)*2
QΣ [var]
(TYPE3)*2
λΣ
Note
• The numbers 1, 2, and 3 used in the equations for 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.
• Only the total value and the fundamental wave (1
Measurement Function
ΦU1-U2(°)
ΦU1-U3(°)
ΦU1-I1(°)
ΦU2-I2(°)
ΦU3-I3(°)
EaU1(°)
EaU2(°)
EaU3(°)
EaU4(°)
EaU5(°)
EaU6(°)
EaI1(°)
EaI2(°)
EaI3(°)
EaI4(°)
EaI5(°)
EaI6(°)
Note
The numbers 1, 2, and 3 used in the equations indicate the case when input elements 1, 2, and 3 are set to
the wiring system shown in the table.
App-6
Methods of Computation and Determination
Single-Phase, Three-Phase,
Three-Wire (1P3W) Three-Wire (3P3W)
(U1 + U2) / 2
(I1 + I2) / 2
Methods of Computation and Determination
Phase angle between U1(1) and the fundamental voltage of element 2, U2(1)
Phase angle between U1(1) and the fundamental voltage of element 3, U3(1)
Phase angle between U1(1) and the fundamental current of element 1, I1(1)
Phase angle between U2(1) and the fundamental current of element 2, I2(1)
Phase angle between U3(1) and the fundamental current of element 3, I3(1)
Electrical angle: Phase angle of U1 to I6 with the falling edge of the signal
received through the Z terminal of the motor evaluation function (option)
as the reference.
Three-Voltage,
Three-Current
Method (3V3A)
P1 + P2
PΣ 2 + QΣ 2
Q1 + Q2
PΣ
SΣ
st
harmonic) are computed for Σ.
(Table 3/4)
Three-Phase,
Four-Wire (3P4W)
(U1 + U2 + U3) / 3
(I1 + I2 + I3) / 3
P1 + P2 + P3
Q1 + Q2 + Q3
(Table 4/4)
IM WT1801-03EN