ABB REC650 - Page 343

IEC09000029_1_en.vsd
SMAI instance 3 phase group
SMAI_20_1:1
1
SMAI_20_2:1
2
SMAI_20_3:1
3
SMAI_20_4:1
4
SMAI_20_5:1
5
SMAI_20_6:1
6
SMAI_20_7:1
7
SMAI_20_8:1
8
SMAI_20_9:1
9
SMAI_20_10:1
10
SMAI_20_11:1
11
SMAI_20_12:1
12
Task time group 1
SMAI instance 3 phase group
SMAI_20_1:2
1
SMAI_20_2:2
2
SMAI_20_3:2 3
SMAI_20_4:2 4
SMAI_20_5:2 5
SMAI_20_6:2 6
SMAI_20_7:2 7
SMAI_20_8:2
8
SMAI_20_9:2 9
SMAI_20_10:2 10
SMAI_20_11:2
11
SMAI_20_12:2 12
Task time group 2
DFTRefGrp7
IEC09000029 V1 EN
Figure 149: SMAI instances as organized in different task time groups and the
corresponding parameter numbers
The example shows a situation with adaptive frequency tracking with one reference
selected for all instances. In practice each instance can be adapted to the needs of the actual
application. The adaptive frequency tracking is needed in IEDs that belong to the
protection system of synchronous machines and that are active during run-up and shout-
down of the machine. In other application the usual setting of the parameter
DFTReference of SMAI is InternalDFTRef.
Example 1
SMAI_20_7:1
BLOCK
DFTSPFC
REVROT
^GRP1L1
^GRP1L2
^GRP1L3
^GRP1N
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
SMAI_20_1-12:2
BLOCK
DFTSPFC
REVROT
^GRP1L1
^GRP1L2
^GRP1L3
^GRP1N
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
IEC09000028-2-en.vsd
IEC09000028 V2 EN
Figure 150: Configuration for using an instance in task time group 1 as DFT reference
1MRK 511 286-UUS A Section 15
Basic IED functions
337
Application manual