Protection Functions
120 PRS-7367
3.22.2.5 Reclosing Success and Unsuccess
For transient fault, the fault will be cleared after the device operates to trip. After the reclosing
command is issued, AR will drop off after time delay 79AR_T_Pluse, and can carry out next
reclosing. When the reclosing is unsuccessful or the reclosing condition is not met after AR
initiated, the reclosing will be considered as unsuccessful, it means that when AR is on, there is a
tripping signal cause the CB to be Open status finally in one reclose cycle, there are several
cases.
1) If any protection element operates to trip when AR is enabled (79AR_On=1) and AR is not
ready (79AR_Ready=0), the device will output the signal 79AR_Unsuccl.
2) For one-shot AR, if the tripping command is received again within reclaim time after the
reclosing pulse is issued, the reclosing shall be considered as unsuccessful.
3) For multi-shot AR, if the reclosing times are equal to the setting value of AR number and the
tripping command is received again after the last reclosing pulse is issued, the reclosing shall
be considered as unsuccessful (79AR_RUN_Circle_N > 79AR_Circle_N).
4) There is a block or lockout BI signal after the AR is initialized.
5) After the dead time is escaped, the automatic sequence initiation is not allowed because of a
synchronization failure when the time setting 79AR_T_WaitSyn expires.
6) A new shot is initiated during the 79AR_T_WaitNext after AR reclose.
7) The protection trip signal has been active longer than the time set 79AR_T_TrFail since the
shot initiation and AR is ready.
8) The circuit breaker is still open after the setting 79AR_T_Unsuc escapes since AR reclose.
After unsuccessful AR is confirmed, if 79AR_UnsucBlk=1, AR will be lockout and AR ready will
reset when AR is failure, so AR can be ready only after releasing lockout and the ready conditions
are met again. If 79AR_UnsucBlk=0, AR ready will reset but not lockout when AR is failure, so AR
will be ready without releasing lockout after the ready conditions are met.
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