ABB Relion 670 series - Page 912

down of the machine. In other application the usual setting of the parameter
DFTReference of SMAI is InternalDFTRef.
Example 1
ANSI07000198.vsd
SMAI1:1
BLOCK
DFTSPFC
^GRP1_A
^GRP1_B
^GRP1_C
^GRP1_N
TYPE
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
SMAI1:13
BLOCK
DFTSPFC
^GRP1_A
^GRP1_B
^GRP1_C
^GRP1_N
TYPE
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
SMAI1:25
BLOCK
DFTSPFC
^GRP1_A
^GRP1_B
^GRP1_C
^GRP1_N
TYPE
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
ANSI07000198 V1 EN
Figure 417: 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
416 for numbering):
SMAI1:1: DFTRefExtOut = DFTRefGrp7 to route SMAI7:7 reference to the SPFCOUT
output, DFTReference = DFTRefGrp7 for SMAI1:1 to use SMAI7:7 as reference (see
Figure
417) SMAI2:2 – SMAI12:12: DFTReference = DFTRefGrp7 for SMAI2:2 –
SMAI12:12 to use SMAI7:7 as reference.
For task time group 2 this gives the following settings:
SMAI1:13 – SMAI12:24: DFTReference = ExternalDFTRef to use DFTSPFC input of
SMAI1:13 as reference (SMAI7:7)
For task time group 3 this gives the following settings:
SMAI1:25 – SMAI12:36: DFTReference = ExternalDFTRef to use DFTSPFC input as
reference (SMAI7:7)
Section 24 1MRK 506 369-UUS -
Basic IED functions
906 Line distance protection REL670 2.2 ANSI
Application manual