ABB Relion 670 Series Applications Manual page 183

1MRK 511 401-UEN Rev. K
for some generator protection application (for example, reverse power protection) or in the
case of line ends with weak end infeed.
StartMode : By this setting it is possible to select how t1 and t2 timers are run and
consequently how output commands are given from the function:
Option 1 - LatchedStart : "By external start signals which is internally latched".
•
When function is once started by external
elapse and then measurement criterion defined by parameter
always checked in order to verify if the appropriate command shall be given out from the
function. Timers cannot be stopped by removing the external
be started again only when all of the following three timers
in function internal design has expired and the measurement criterion defined by
parameter
corresponds to the function behavior in 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
verify 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
the measurement criterion defined by parameter
then the appropriate command will be given out from the function. Timers can be stopped
by resetting the external
Figure
When one of the two "follow modes" is used, there is a settable timer
block the external
t1 and t2 timers and consequently prevent any backup trip command. At the same time the
STALARM output from the function will have logical value one. To reset this signal external
START signal shall be removed. This is done in order to prevent unwanted operation of the
breaker failure function for cases where a permanent
due to a fault in the station battery system). Note that any backup trip command will inhibit
running of
START
Current Check
CB Position Check
IEC18001002 V1 EN-US
Figure 86: Simplified overall logic for LatchedStart
Bay control REC670
Application manual
FunctionMode has deactivated, see
t1 and t2 will run while external START signal is present. If they elapse then
t1 and t2 will run while external START signal is present and in the same time
START signal or if the measurement criterion de-activates, see
88.
START input signal when it times-out. This will automatically also reset the
tStartTimeout timer.
30ms
S Q
R
© Copyright 2017 Hitachi Power Grids. All rights reserved
START signal, the timers t1 and t2 will always
Figure 86. Note that this option
FunctionMode will be checked in order to
START signal, see
FunctionMode is active. If they elapse
START signal is given by mistake (e.g.
t1 30ms
OR
t
t2 30ms
OR
t
OR
150ms
t
NOT
Current protection
FunctionMode will be
START signal. Function can
t1 , t2 and fixed timer of 150ms
Figure 87.
tStartTimeout which will
TRRET
AND
TRBU
AND
AND
IEC18001002-1-en.vsdx
Section 8
177