16.7.2
Application
M15322-3 v11
The Fixed signals function FXDSIGN generates 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 395: 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.
I3PW1CT1
I3PW2CT1
I3P
REFPDIF
GRP_OFF
FXDSIGN
IEC09000620_3_en.vsd
IEC09000620 V3 EN-US
Figure 396: REFPDIF function inputs for normal transformer application
1MRK 505 343-UEN B
Section 16
Logic
641
Application manual
Содержание Relion 670 series
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