ABB ret650 - Page 439

Set value for
parameter
“Mode”
Formula used for complex, three-
phase power calculation
Formula used for voltage and
current magnitude calculation
Comment
4 L1L2
* *
1 2 1 2
( )= × -
L L L L
S U I I
EQUATION1391 V1 EN (Equation 91)
1 2
1 2
( ) / 2
=
= +
L L
L L
U U
I I I
EQUATION1392 V1 EN (Equation 92)
Used when
only U
L1L2
phase-to-
phase
voltage is
available
5
L2L3
* *
2 3 2 3
( )= × -
L L L L
S U I I
EQUATION1393 V1 EN (Equation 93)
2 3
2 3
( ) / 2
=
= +
L L
L L
U U
I I I
EQUATION1394 V1 EN (Equation 94)
Used when
only U
L2L3
phase-to-
phase
voltage is
available
6
L3L1
* *
3 1 3 1
( )= × -
L L L L
S U I I
EQUATION1395 V1 EN (Equation 95)
3 1
3 1
( ) / 2
=
= +
L L
L L
U U
I I I
EQUATION1396 V1 EN (Equation 96)
Used when
only U
L3L1
phase-to-
phase
voltage is
available
7
L1
*
1 1
3= × ×
L L
S U I
EQUATION1397 V1 EN (Equation 97)
1
1
3= ×
=
L
L
U U
I I
EQUATION1398 V1 EN (Equation 98)
Used when
only U
L1
phase-to-
earth voltage
is available
8
L2
*
2 2
3= × ×
L L
S U I
EQUATION1399 V1 EN (Equation 99)
2
2
3= ×
=
L
L
U U
I I
EQUATION1400 V1 EN (Equation 100)
Used when
only U
L2
phase-to-
earth voltage
is available
9
L3
*
3 3
3= × ×
L L
S U I
EQUATION1401 V1 EN (Equation 101)
3
3
3= ×
=
L
L
U U
I I
EQUATION1402 V1 EN (Equation 102)
Used when
only U
L3
phase-to-
earth voltage
is available
* 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:
Re( )
=P S
EQUATION1403 V1 EN (Equation 103)
Im( )=Q S
EQUATION1404 V1 EN (Equation 104)
1MRK 504 135-UEN A Section 14
Monitoring
433
Technical manual