ABB RELION REX640 Technical Manual page 1440

Measurement functions
Measurement mode setting
values
PhsA
PhsB
PhsC
Depending upon the set
module calculates active power, reactive power and apparent power values from the
available set of measurements.
P = Re( )
Q = Im( )
S
=
Cos
The calculated powers are available as function outputs S_INST, P_INST, Q_INST
and the power factor angle as PF_INST.
Depending on the unit multiplier selected with
power values in the monitored data and measurement view are presented in units of
kVA/kW/kVAr or in units of MVA/MW/MVAr.
1440
Measurement mode , the Power and energy calculation
S
S
2 2
S P Q
= +
P
ϕ =
S
Power calculation
*
S 3 U I
A A
= ⋅ ⋅
*
S U I
3
B B
= ⋅ ⋅
*
S 3 U I
C C
= ⋅ ⋅
Power unit Mult , the calculated
1MRS759142 F
(Equation 345)
(Equation 346)
(Equation 347)
(Equation 348)
(Equation 349)
(Equation 350)
(Equation 351)
REX640
Technical Manual