ABB Relion 670 Series Applications Manual page 502

Section 21
Basic IED functions
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 228: 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
Example 1
496
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.
DFTReference of SMAI is InternalDFTRef .
1MRK 511 358-UUS A
Application manual