ABB RET670 - Page 98

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 23: 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
22 for numbering):
SMAI1:1: DFTRefExtOut = AdDFTRefCh7 to route SMAI7:7 reference to the
SPFCOUT output, DFTReference = AdDFTRefCh7 for SMAI1:1 to use SMAI7:7 as
reference (see Figure
23) SMAI2:2 – SMAI12:12: DFTReference = AdDFTRefCh7 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 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)
Example 2
Section 3 1MRK504116-UUS C
IED application
92
Application manual