Fixed Signal Function Block Fxdsign - ABB REG670 Applications Manual

Section 16
Logic
16.7
16.7.1
16.7.2
610

Fixed signal function block FXDSIGN

Identification
Function description
Fixed signals
Application
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.
REFPDIF
I3PW1CT1
I3PW2CT1
I3P
IEC09000619_3_en.vsd
IEC09000619 V3 EN
Figure 306: 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.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
IEC 61850 IEC 60617
identification identification
FXDSIGN -
1MRK 502 071-UEN -
ANSI/IEEE C37.2
device number
-
Application manual