ABB Relion 670 Series Applications Manual page 596

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Basic IED functions

machine. Also, adaptive frequency tracking is needed in PMU application to be compliant to

PMU standards. In other application the usual setting of the parameter

InternalDFTRef .

IEC07000198 V4 EN-US

Figure 282: 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

DFTReference = DFTRefGrp7 for SMAI1:1 to use SMAI7:7 as reference (see Figure 282) SMAI2:2 –

For task time group 2 this gives the following settings:

SMAI1:13 – SMAI12:24:

reference (SMAI7:7)

For task time group 3 this gives the following settings:

The user should use 0.9 ms task time for connection to PMU functions.

DFTRefExtOut = DFTRefGrp7 to route SMAI7:7 reference to the SPFCOUT output,

DFTReference = DFTRefGrp7 for SMAI2:2 – SMAI12:12 to use SMAI7:7 as reference.

DFTReference = ExternalDFTRef to use DFTSPFC input of SMAI1:13 as

DFTReference of SMAI

IEC07000198-4-en.vsd

for numbering):

1MRK 511 401-UEN Rev. K

Bay control REC670

Application manual

Relion rec670