IEC07000197.vsd
SMAI instance 3 phase group
SMAI1: 1 1
SMAI2: 2 2
SMAI3: 3 3
SMAI4: 4 4
SMAI5: 5 5
SMAI6: 6 6
SMAI7: 7 7
SMAI8: 8 8
SMAI9: 9 9
SMAI10:10 10
SMAI11:11 11
SMAI12:12 12
Task time group 1
SMAI instance 3 phase group
SMAI1:13 1
SMAI2:14 2
SMAI3:15 3
SMAI4:16 4
SMAI5:17 5
SMAI6:18 6
SMAI7:19 7
SMAI8:20 8
SMAI9:21 9
SMAI10:22 10
SMAI11:23 11
SMAI12:24 12
Task time group 2
SMAI instance 3 phase group
SMAI1:25 1
SMAI2:26 2
SMAI3:27 3
SMAI4:28 4
SMAI5:29 5
SMAI6:30 6
SMAI7:31 7
SMAI8:32 8
SMAI9:33 9
SMAI10:34 10
SMAI11:35 11
SMAI12:36 12
Task time group 3
AdDFTRefCh7
AdDFTRefCh4
IEC07000197 V2 EN
Figure 416: Twelve SMAI instances are grouped within one task time. SMAI blocks
are available in three different task times in the IED. Two pointed
instances are used in the following examples.
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-
1MRK 506 369-UUS - Section 24
Basic IED functions
Line distance protection REL670 2.2 ANSI 905
Application manual
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