1. Check that the auto recloser is operative, for example, by making a reclosing
shot without the INHIBIT signal.
2. Apply a fault and thereby a ST
ART signal. At the same time, or during the
dead time, apply a signal to the input INHIBIT.
3. Check that the auto reclosing sequence is interrupted and no auto reclosing
takes place.
Check closing onto a fault
M12400-137 v5
1. Check that the auto recloser 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 immediately apply a fault and thereby a START
signal.
4. Check that no auto reclosing takes place.
Checking the influence of circuit breaker not ready for reclosing
M12400-149 v5
1. Check that the auto recloser function is operative, for example by making an
auto 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 auto reclosing takes place.
Checking the influence of synchrocheck (at three-phase reclosing)
M12400-161 v10
1. Check that the auto recloser is operative, for example, by making a three-
phase reclosing shot with the synchrocheck SESRSYN conditions fullfilled.
Set the SESRSYN function to Off to eliminate the signal connected to input
signal SYNC.
2. Apply a fault causing three-phase trip and thereby a START and a TR3P signal
to the auto recloser.
3. Wait for the tSync time-out limit.
Check that no reclosing is made.
Checking the response when auto recloser is
Off
M12400-173 v7
Procedure
1. Check that the auto recloser is operative, for example by making a reclosing
shot.
Set the autoreclosing operation to Off, for example by external control.
The output READY shall be low, and PREP3P shall be high.
2. Apply a single phase fault and thereby a START signal.
3. Check that a definitive three phase trip and no auto reclosing takes place.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
234 Line differential protection RED670 2.2 IEC
Commissioning manual
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