YOKOGAWA CW240

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
∑PP1P2
∑QQ1Q2
Average Current
Active Power
Reactive
Power 2
*4
Apparent Power S = U  I ∑SS1 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
∑PP1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 =
(S1
S3)
∑ 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