ABB REC670 Applications Manual page 624

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Basic IED functions

shout-down of the machine. In other application the usual setting of the parameter

DFTReference of SMAI is InternalDFTRef.

ANSI07000198 V1 EN-US

Configuration for using an instance in task time group 1 as DFT

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

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 234) 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)

For task time group 3 this gives the following settings:

SMAI1:25 – SMAI12:36: DFTReference = ExternalDFTRef to use DFTSPFC input as

reference (SMAI7:7)

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