ABB REL670 2.2 IEC, Applications Manual

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17.7 Fixed signal function block FXDSIGN
IP15080-1 v2
17.7.1 Identification
SEMOD167904-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fixed signals FXDSIGN - -
17.7.2 Application
M15322-3 v15
The Fixed signals function (FXDSIGN) has nine pre-set (fixed) signals that can be
used in the configuration of an IED, either for forcing the unused inputs in other
function blocks to a certain level/value, or for creating certain logic. Boolean,
integer, floating point, string types of signals are available.
One FXDSIGN function block is included in all IEDs.
Example for use of GRP_OFF signal in FXDSIGN
The Restricted earth fault function (REFPDIF) can be used both for auto-
transformers and normal transformers.
When used for auto-transformers, information from both windings parts, together
with the neutral point current, needs to be available to the function. This means that
three inputs are needed.
I3PW1CT1
I3PW2CT1
I3P
REFPDIF
IEC09000619_3_en.vsd
IEC09000619 V3 EN-US
Figure 387: REFPDIF function inputs for autotransformer application
For normal transformers only one winding and the neutral point is available. This
means that only two inputs are used. Since all group connections are mandatory to
be connected, the third input needs to be connected to something, which is the
GRP_OFF signal in FXDSIGN function block.
Section 17
1MRK 506 369-UEN B
Logic
752 Line distance protection REL670 2.2 IEC
Application manual