ABB RELION RET670 - Page 981

Example 2
ANSI07000198.vsd
SMAI1:13
BLOCK
DFTSPFC
^GRP1_A
^GRP1_B
^GRP1_C
^GRP1_N
TYPE
SPFCOUT
AI3P
AI1
AI2
AI3
AI4
AIN
SMAI1:1
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
ANSI07000199 V1 EN-US
Figure 431: Configuration for using an instance in task time group 2 as DFT
reference.
Assume instance SMAI4:16 in task time group 2 has been selected in the configuration
to control the frequency tracking for all instances. 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
429 for numbering):
SMAI1:1 – SMAI12:12: DFTReference =
ExternalDFTRef to use DFTSPFC input as
reference (SMAI4:16)
For task time group 2 this gives the following settings:
SMAI1:13: DFTRefExtOut = DFTRefGrp4 to route SMAI4:16 reference to the
SPFCOUT output, DFTReference = DFTRefGrp4 for SMAI1:13 to use SMAI4:16 as
reference (see Figure
431) SMAI2:14 – SMAI12:24: DFTReference =
DFTRefGrp4 to
use SMAI4:16 as reference.
For task time group 3 this gives the following settings:
SMAI1:25 – SMAI12:36: DFTReference = ExternalDFTRef to use DFTSPFC input as
reference (SMAI4:16)
1MRK 504 163-UUS A Section 24
Basic IED functions
Transformer protection RET670 2.2 ANSI 975
Application manual