ABB Relion 650 Series Applications Manual page 190

Section 11
Logic
11.4 Fixed signals FXDSIGN
11.4.1 Identification
Function description
Fixed signals
11.4.2 Application
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.
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.
ANSI11000083 V1 EN-US
Figure 97: REFPDIF (87N) function inputs for autotransformer application
184
Always be careful when connecting function blocks with a fast cycle time to
function blocks with a slow cycle time.
Remember to design the logic circuits carefully and always check the execution
sequence for different functions. In other cases, additional time delays must be
introduced into the logic schemes to prevent errors, for example, race between
functions.
Default value on all four inputs of the AND gate are logical 1 which makes it
possible for the user to just use the required number of inputs and leave the rest
un-connected. The output OUT has a default value 0 initially, which will suppress
one cycle pulse if the function has been put in the wrong execution order.
IEC 61850
identification
FXDSIGN
REFPDIF (87N)
I3PW1CT1
I3PW2CT1
I3P
ANSI11000083_1_en.vsd
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IEC 60617 ANSI/IEEE C37.2
identification device number
- -
1MRK 505 287-UUS B
SEMOD167904-2 v2
M15322-3 v9
Busbar protection REB650
Application manual