13.6 Fixed signal function block FXDSIGN
IP15080-1 v2
13.6.1 Identification
SEMOD167904-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fixed signals FXDSIGN - -
13.6.2 Application
M15322-3 v12
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
(87N) 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 (87N)
ANSI11000083_1_en.vsd
ANSI11000083 V1 EN-US
Figure 186: REFPDIF (87N) 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 13 1MRK 505 370-UUS A
Logic
412 Busbar protection REB670 2.2 ANSI
Application manual
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