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
Содержание ret650
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