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Section 12
Monitoring
Y
A >=
pre-set value
Value Reported
(1st)
IEC99000530 V1 EN
Figure 150:
Reporting with integral dead-band supervision
12.1.8.2
334
A1 >=
pre-set value
Y2
A1
Value
A
Reported
Y1
Measurements CVMMXN
Mode of operation
The measurement function must be connected to three-phase current and three-phase
voltage input in the configuration tool (group signals), but it is capable to measure and
calculate above mentioned quantities in nine different ways depending on the
available VT inputs connected to the IED. The end user can freely select by a
parameter setting, which one of the nine available measuring modes shall be used
within the function. Available options are summarized in the following table:
Set value for
Formula used for complex, three-
parameter
phase power calculation
"Mode"
1
L1, L2, L3
=
U
S
L
1
EQUATION1385 V1 EN
2
Arone
=
S
U
EQUATION1387 V1 EN
3
PosSeq
= ×
S
3
EQUATION1389 V1 EN
Table continues on next page
A2 >=
pre-set value
Y3
A2
Y4
Value
Reported
Value
Reported
Formula used for voltage and
current magnitude calculation
*
*
*
×
I
+
U
×
I
+
U
×
I
U
L
1
L
2
L
2
L
3
L
3
I
EQUATION1386 V1 EN
×
-
×
U
*
*
I
U
I
L L
1 2
L
1
L L
2 3
L
3
(Equation 32)
I
EQUATION1388 V1 EN
×
*
U
U
I
PosSeq
PosSeq
(Equation 34)
I
EQUATION1390 V1 EN
1MRK 505 288-UEN A
A3 + A4 + A5 + A6 + A7 >=
pre-set value
A4
A6
A5
A7
A3
Y5
Value
Reported
99000530.vsd
Comment
=
+
+
(
U
U
U
) / 3
L
1
L
2
L
3
=
+
+
(
I
I
I
) / 3
L
1
L
2
L
3
=
+
(
U
U
) / 2
L L
1 2
L L
2 3
=
+
(
I
I
) / 2
L
1
L
3
(Equation 33)
=
×
3
U
PosSeq
=
I
PosSeq
(Equation 35)
Technical manual
t
Used when
three phase-
to-earth
voltages are
available
Used when
three two
phase-to-
phase
voltages are
available
Used when
only
symmetrical
three phase
power shall
be measured
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