ABB Relion 650 Series Applications Manual page 239

1MRK 505 287-UUS B
Example of adaptive frequency tracking
SMAI instance
SMAI_20_1:1
SMAI_20_2:1
SMAI_20_3:1
SMAI_20_4:1
SMAI_20_5:1
SMAI_20_6:1
SMAI_20_7:1
SMAI_20_8:1
SMAI_20_9:1
SMAI_20_10:1
SMAI_20_11:1
SMAI_20_12:1
SMAI instance
SMAI_20_1:2
SMAI_20_2:2
SMAI_20_3:2
SMAI_20_4:2
SMAI_20_5:2
SMAI_20_6:2
SMAI_20_7:2
SMAI_20_8:2
SMAI_20_9:2
SMAI_20_10:2
SMAI_20_11:2
SMAI_20_12:2
IEC09000029 V1 EN-US
Figure 114: SMAI instances as organized in different task time groups and the corresponding
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
Example 1
Busbar protection REB650
Application manual
Even if the user sets the
MinValFreqMeas is still visible. However, using the current channel values as base
for frequency measurement is not recommendable for a number of reasons, not
last among them being the low level of currents that one can have in normal
operating conditions.
Task time group 1
3 phase group
1
2
3
4
5
6
7
8
9
10
11
12
Task time group 2
3 phase group
1
2
3
4
5
6
7
8
9
10
11
12
IEC09000029_1_en.vsd
parameter numbers
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AnalogInputType of a SMAI block to " Current ", the
DFTRefGrp7
DFTReference of SMAI is InternalDFTRef .
Section 15
Basic IED functions
233