The examples 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. The adaptive frequency tracking is needed in IEDs that belong to
the protection system of synchronous machines and that are active during run-up and
shout-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-US
Figure 334: 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
333 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
334) 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)
Section 23 1MRK 502 071-UUS A
Basic IED functions
784 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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