6.7.2.4
Checking the reclosing conditions
When checking the influence of a releasing condition it is suggested to first run a
sequence with the condition fulfilled. When the condition signal is removed, and a
new sequence is run, it indicates that the result was due to the changed condition.
In case of a blocking signal the procedure should be similar. Start without the
blocking or inhibit signal, and then run a sequence with the blocking or inhibit
signal added.
Checking the influence of the INHIBIT signal
1.
Check that the autorecloser function SMBRREC is operative, for example, by
making a reclosing shot without the INHIBIT signal.
2.
Apply a fault and thereby a START signal. At the same time, or during the
open time, apply a signal to the input INHIBIT.
3.
Check that the reclosing sequence is interrupted and no reclosing takes place.
Check closing onto a fault
1.
Check that the autorecloser function SMBRREC is operative, for example by
making a reclosing shot.
Keep the CBREADY signal high.
2.
Set the breaker simulating relay BR in Open position.
3.
Close the BR relay and apply immediately a fault and thereby a START signal.
4.
Check that no reclosing takes place.
Checking the influence of CB not ready for reclosing
1.
Check that the autorecloser function SMBRREC is operative, for example by
making a reclosing shot.
Keep the CB simulator BR closed. Remove the CBREADY signal by opening
SRY.
2.
Apply a fault and thereby a START signal.
3.
Check that no reclosing takes place.
Checking the influence of synchronizing check (at three-phase
reclosing)
1.
Check that the autorecloser function SMBRREC is operative, for example, by
making a three-phase reclosing shot with the synchronizing check condition.
Remove the SMBRREC signal.
2.
Apply a fault causing three-phase trip and thereby a START signal.
3.
Wait for the
tSync
time out limit.
Check that no reclosing is made.
Section 6
1MRK 511 248-UEN -
Testing functionality
82
Commissioning Manual