ABB ret650, Technical Manual

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99000530.vsd
Y
t
Value Reported
(1st)
Y1
Value
Reported
A1 Y2
Value
Reported
Y3
Y4
A
Value
Reported
A2
Y5
A3
A4
A5
A7
A6
Value
Reported
A2 >=
pre-set value
A1 >=
pre-set value
A >=
pre-set value
A3 + A4 + A5 + A6 + A7 >=
pre-set value
IEC99000530 V1 EN
Figure 194: Reporting with integral dead-band supervision
14.1.8.2 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
parameter
“Mode”
Formula used for complex, three-
phase power calculation
Formula used for voltage and
current magnitude calculation
Comment
1 L1, L2, L3
* * *
1 1 2 2 3 3
= × + × + ×
L L L L L L
S
U I U I U I
EQUATION1385 V1 EN
1 2 3
1 2 3
( ) / 3
( ) / 3
= + +
= + +
L L L
L L L
U U U U
I I I I
EQUATION1386 V1 EN
Used when
three phase-
to-earth
voltages are
available
2 Arone
* *
1 2 1 2 3 3
= × - ×
L L L L L L
S U I U I
EQUATION1387 V1 EN
(Equation 87)
1 2 2 3
1 3
( ) / 2
( ) / 2
= +
= +
L L L L
L L
U U U
I I I
EQUATION1388 V1 EN
(Equation 88)
Used when
three two
phase-to-
phase
voltages are
available
3 PosSeq
*
3
= × ×
PosSeq PosSeq
S U I
EQUATION1389 V1 EN
(Equation 89)
3
= ×
=
PosSeq
PosSeq
U U
I I
EQUATION1390 V1 EN
(Equation 90)
Used when
only
symmetrical
three phase
power shall
be measured
Table continues on next page
Section 14
1MRK 504 135-UEN A
Monitoring
432
Technical manual