Assume instance SMAI_20_7:1 in task time group 1 has been selected in the
configuration to control the frequency tracking (For the SMAI_20_x of task time group
1). 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
149 for numbering):
SMAI_20_1:1 DFTRefExtOut = DFTRefGrp7 to route SMAI_20_7:1 reference to the
SPFCOUT output, DFTReference = DFTRefGrp7 for SMAI_20_7:1 to use
SMAI_20_7:1 as reference (see Figure
150). .
SMAI_20_2:1 - SMAI_20_12:1 DFTReference = DFTRefGrp7 for SMAI_20_2:1 -
SMAI_20_12:1 to use SMAI_20_7:1 as reference.
For task time group 2 this gives the following settings:
SMAI_20_2:2: DFTReference = ExternalDFTRef to use DFTSPFC input as reference
(SMAI_20_7:1); DFTRefExtOut = ExternalDFTRef (even if the output SPCFOUT is not
wired in AC).
SMAI_20_2:2 - SMAI_20_12:2 DFTReference = ExternalDFTRef to use DFTSPFC
input as reference (SMAI_20_7:1)
15.10 Summation block 3 phase 3PHSUM
15.10.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Summation block 3 phase 3PHSUM - -
15.10.2 Application
Summation block 3 phase function 3PHSUM is used to get the sum of two sets of three-
phase analog signals (of the same type) for those IED functions that might need it.
15.10.3 Setting guidelines
The summation block receives the three-phase signals from SMAI blocks. The
summation block has several settings.
Section 15 1MRK 511 286-UUS A
Basic IED functions
338
Application manual
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