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Section 20
Basic IED functions
BLOCK
DFTSPFC
^GRP1L1
^GRP1L2
^GRP1L3
^GRP1N
IEC07000198 V3 EN-US
Figure 231: Configuration for using an instance in task time group 1 as DFT reference
Assume instance SMAI7:7 in task time group 1 has been selected in the configuration to control
the frequency tracking . Observe that the selected reference instance (i.e. frequency tracking
master) must be a voltage type. Observe that positive sequence voltage is used for the
frequency tracking feature.
For task time group 1 this gives the following settings (see Figure
SMAI1:1:
DFTReference = DFTRefGrp7 for SMAI1:1 to use SMAI7:7 as reference (see Figure 231) SMAI2:2 –
SMAI12:12:
For task time group 2 this gives the following settings:
SMAI1:13 – SMAI12:24:
reference (SMAI7:7)
For task time group 3 this gives the following settings:
SMAI1:25 – SMAI12:36:
(SMAI7:7)
Example 2
440
SMAI1:1
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
DFTRefExtOut = DFTRefGrp7 to route SMAI7:7 reference to the SPFCOUT output,
DFTReference = DFTRefGrp7 for SMAI2:2 – SMAI12:12 to use SMAI7:7 as reference.
DFTReference = ExternalDFTRef to use DFTSPFC input of SMAI1:13 as
DFTReference = ExternalDFTRef to use DFTSPFC input as reference
SMAI1:13
BLOCK
SPFCOUT
DFTSPFC
AI3P
^GRP1L1
AI1
^GRP1L2
AI2
^GRP1L3
AI3
^GRP1N
AI4
AIN
SMAI1:25
BLOCK
SPFCOUT
DFTSPFC
AI3P
^GRP1L1
AI1
^GRP1L2
AI2
^GRP1L3
AI3
^GRP1N
AI4
AIN
IEC07000198-2-en.vsd
230
for numbering):
Busbar protection REB670
1MRK 505 370-UEN D
Application manual
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