ABB RELION REX640 - Page 1440

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