YOKOGAWA CW240, User Manual, Page: 343 / 388

17-4
IM CW240E
Formula for Each Wiring
Measurement
Item
Wiring
Single Phase 3 Wire
Equations Symbol
Average Voltage Uave ( U1 U2 ) / 2
Iave
( I 1 I 2 ) / 2
∑ P P1 P2
∑ Q Q1 Q2
Average Current
Active Power
Reactive
Power 2
*4
Apparent Power S = U I ∑ S S1 S2
Power Factor
Reactive power
method not used
*6
∑ PF
Reactive power
method used
∑ PF
Phase Angle
*6
∑ PA
Q = S
2
P
2
∑
PF =
∑
S
∑
P
∑
PA = cos
–1
∑
PF
∑
P
2
∑
Q
2
∑
PF =
∑
P
_
_
_
_
Measurement
Item
Wiring
3 Phase 3 Wire 2 Current
*7
Average Voltage Uave ( U1 U2 U3 ) / 3
Iave ( I 1 I 2 I 3 ) / 3
*2
∑ P P1 P3
∑ Q
Average Current
Active Power
Reactive
Power 2
*4
Apparent Power
S U I ∑ S
Power Factor
Reactive power
method not used
*6
∑ PF
Reactive power
method used
∑ PF
Phase Angle
*6
∑ PA
∑
PF =
( S 1 S 3)
∑
S
∑
P
Q = S
2
P
2 ∑
S
2
∑
P
2
∑
P
2
∑
Q
2
∑
PF =
∑
PA = cos
–1 ∑
PF
∑
P
2
3
Equations
Symbol
_
_
_
_
17.1 CW 240 Specifications