ABB REG650 Technical Manual page 423

1MRK 502 043-UUS B
Technical Manual
Set value for Formula used for complex, three-
parameter phase power calculation
"Mode"
8 B
= ×
S 3
EQUATION1575 V1 EN
9 C
= ×
S 3
EQUATION1577 V1 EN
* means complex conjugated value
It shall be noted that only in the first two operating modes that is, 1 & 2 the
measurement function calculates exact three-phase power. In other operating modes
that is, from 3 to 9 it calculates the three-phase power under assumption that the power
system is fully symmetrical. Once the complex apparent power is calculated then the P,
Q, S, & PF are calculated in accordance with the following formulas:
=
P Re( ) S
EQUATION1403 V1 EN
=
Q Im( ) S
EQUATION1404 V1 EN
= = 2 + 2
S S P Q
EQUATION1405 V1 EN
P
j
= =
PF cos
S
EQUATION1406 V1 EN
Additionally to the power factor value the two binary output signals from the function
are provided which indicates the angular relationship between current and voltage
phasors. Binary output signal ILAG is set to one when current phasor is lagging behind
voltage phasor. Binary output signal ILEAD is set to one when current phasor is
leading the voltage phasor.
Formula used for voltage and
current magnitude calculation
× V
*
V I
B B
(Equation 104)
=
I
EQUATION1576 V1 EN
× V
*
V I
C C
(Equation 106)
=
I
EQUATION1578 V1 EN
Section 14
Monitoring
Comment
Used when only
= ×
3 V V
B
B
ground voltage is
available
I
B
(Equation 105)
Used when only
= ×
3 V V
C
C
ground voltage is
available
I
C
(Equation 107)
phase-to-
phase-to-
(Equation 108)
(Equation 109)
(Equation 110)
(Equation 111)
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