ABB Relion 670 Series Applications Manual page 188

Section 8
Current protection
When function is once started by external
and then measurement criterion defined by parameter
in order to verify if the appropriate command shall be given out from the function. Timers
cannot be stopped by removing the external
when all of the following three timers
design has expired and the measurement criterion defined by parameter
deactivated, see
previous versions of the 670 Series from version 1.0 up to and including version 2.1.
Option 2 - FollowStart : "Follow the external start signal only".
•
The timers
measurement criterion defined by parameter
if the appropriate command shall be given out from the function. Timers can be always
stopped by resetting the external
Option 3- FollowStart&Mode : "Follow external start signal and selected FunctionMode " .
•
The timers
measurement criterion defined by parameter
appropriate command will be given out from the function. Timers can be stopped by resetting
the external
When one of the two "follow modes" is used, there is a settable timer
block the external
t2 timers and consequently prevent any backup trip command. At the same time the STALARM
and
output from the function will have logical value one. To reset this signal external
be removed. This is done in order to prevent unwanted operation of the breaker failure function
for cases where a permanent
battery system). Note that any backup trip command will inhibit running of
PICKUP
Current Check
CB Position Check
ANSI18001002 V1 EN-US
Figure 85: Simplified overall logic for LatchedStart
182
Figure 85. Note that this option corresponds to the function behavior in
t1 and t2 will run while external START signal is present. If they elapse then
START signal, see
t1 and t2 will run while external START signal is present and in the same time the
START signal or if the measurement criterion de-activates, see
START input signal when it times-out. This will automatically also reset the t1
START signal is given by mistake (e.g. due to a fault in the station
30ms t1
S Q
t
R
t2
t
150ms
t
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START signal, the timers t1 and t2 will always elapse
FunctionMode will be always checked
START signal. Function can be started again only
t1 , t2 and fixed timer of 150ms in function internal
FunctionMode will be checked in order to verify
Figure 86.
FunctionMode is active. If they elapse then the
30ms
OR
AND
30ms
OR
AND
OR
AND
NOT
1MRK 511 401-UUS F
FunctionMode has
Figure 87.
tStartTimeout which will
START signal shall
tStartTimeout timer.
TRRET
TRBU
ANSI 18001002-1-en.vsdx
Bay control REC670
Application manual