Below 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.
SPFCOUT
AI3PDFTSPFC
SMAI_20_1:1
REVROT
GRP1L2
GRP1L1
GRP1L3
AI1
AI2
BLOCK
GRP1N
AI3
AI4
AIN
Task time group 1
(5ms)
Task time group 2
(20ms)
SPFCOUT
AI3PDFTSPFC
SMAI_20_1:2
REVROT
GRP1L2
GRP1L1
GRP1L3
AI1
AI2
BLOCK
GRP1N
AI3
AI4
AIN
Task time group 1 (5ms)
SMAI instance 3 phase group
SMAI_20_1:1 1
SMAI_20_2:1 2
SMAI_20_3:1 3
SMAI_20_4:1 4
SMAI_20_5:1 5
SMAI_20_6:1 6
SMAI_20_7:1 7
SMAI_20_8:1 8
SMAI_20_9:1 9
SMAI_20_10:1 10
SMAI_20_11:1 11
SMAI_20_12:1 12
Task time group 2 (20ms)
SMAI instance 3 phase group
SMAI_20_1:2 1
SMAI_20_2:2 2
SMAI_20_3:2 3
SMAI_20_4:2 4
SMAI_20_5:2 5
SMAI_20_6:2 6
SMAI_20_7:2 7
SMAI_20_8:2 8
SMAI_20_9:2 9
SMAI_20_10:2 10
SMAI_20_11:2 11
SMAI_20_12:2 12
DFTRefGrp7
IEC11000284-1-en.vsd
IEC11000284 V1 EN
Figure 308: Configuration for using an instance in task time group 1 as DFT
reference
Assume instance SMAI_20_7:1 in task time group 1 has been selected in the
configuration to control the frequency tracking (For the SMAI_20_x task time
groups). Note that the selected reference instance must be a voltage type.
For task time group 1 this gives the following settings:
For SMAI_20_1:1
DFTRefExtOut set to DFTRefGrp7 so as to route SMAI_20_7:1 reference to the
SPFCOUT output, DFTReference set to DFTRefGrp7 so that SMAI_20_7:1 is used as
reference.
For SMAI_20_2:1 to SMAI_20_12:1
DFTReference set to DFTRefGrp7 so that SMAI_20_7:1 is used as reference.
For task time group 2 this gives the following settings:
1MRK 502 048-UEN A Section 17
Basic IED functions
645
Technical manual
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