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1MRK 505 370-UEN D
Task time group 1
SMAI instance
SMAI1:1
SMAI2:2
SMAI3:3
SMAI4:4
SMAI5:5
SMAI6:6
SMAI7:7
SMAI8:8
SMAI9:9
SMAI10:10
SMAI11:11
SMAI12:12
Task time group 2
SMAI instance
SMAI1:13
SMAI2:14
SMAI3:15
SMAI4:16
SMAI5:17
SMAI6:18
SMAI7:19
SMAI8:20
SMAI9:21
SMAI10:22
SMAI11:23
SMAI12:24
Task time group 3
SMAI instance
SMAI1:25
SMAI2:26
SMAI3:27
SMAI4:28
SMAI5:29
SMAI6:30
SMAI7:31
SMAI8:32
SMAI9:33
SMAI10:34
SMAI11:35
SMAI12:36
IEC07000197 V2 EN-US
Figure 230: Twelve SMAI instances are grouped within one task time. SMAI blocks are
The examples 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
InternalDFTRef .
Example 1
Busbar protection REB670
Application manual
3 phase group
1
2
3
AdDFTRefCh7
4
5
6
7
8
9
10
11
12
3 phase group
1
AdDFTRefCh4
2
3
4
5
6
7
8
9
10
11
12
3 phase group
1
2
3
4
5
6
7
8
9
10
11
12
IEC07000197.vsd
available in three different task times in the IED. Two pointed instances are
used in the following examples.
Section 20
Basic IED functions
DFTReference of SMAI is
439
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