ABB ret650 - Page 356

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-US
Figure 125: 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-down of the machine. In other application the usual setting
of the parameter DFTReference of SMAI is InternalDFTRef.
Example 1
Section 18 1MRK 504 169-UEN A
Basic IED functions
350 Transformer protection RET650 2.2 IEC
Application manual