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Section 10
Testing functionality by secondary injection
208
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 SESRSYN synchronizing check
condition.
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.
3.
Wait for the tSync time-out limit.
Check that no reclosing is made.
Checking the response when autoreclosing is
Procedure
1.
Check that the autorecloser function SMBRREC 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 reclosing takes place.
Testing autoreclosing in a multi-breaker arrangement
The usual arrangement is to have an autorecloser function SMBRREC per circuit-
breaker. They can be in different CB related IEDs or in a common IED.
•
A master SMBRREC function is set with Priority = High.
•
A slave SMBRREC function is set with Priority = Low.
See the application manual for an illustration of typical
interconnections.
The two functions can be checked individually by carefully applying START, WAIT,
and INHIBIT signals.
It is also possible to verify the two functions together by using CB simulating
equipment for two CB circuits. There should be interconnections from the master to
the slave function, WFMASTER - WAIT, and UNSUCCL - INHIBIT, as shown in the
illustration referred to above.
1MRK 506 355-UEN A
Off
Line distance protection REL670 2.1 IEC
Commissioning manual
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