Protection Functions
116 PRS-7367
“1”, AR enable are determined by external signal via binary inputs and logic settings. When logic
setting 79AR_ExtCtrl set as “0”, AR enable are determined only by logic settings. When AR is
enabled, the device will output contact 79AR_On.
SET
&
79AR_Enable
SIG
79AR_Ena
SET
79AR_ExtCtrl
SIG
79AR_Disable
&
&
1
SIG79AR_On
Figure 3.22-2 AR On
3.22.2.2 AR Ready
An auto-recloser must be ready to operate before performing reclosing. The output signal
79AR_Ready means that the auto-recloser can perform at least one shot of reclosing function, i.e.,
breaker open-close-open. When the device is energized or after the settings are modified, 79AR
cannot be ready unless the following conditions are met:
AR is enabled (79AR_On=1).
the CB close position is 1 and last for 79_CBClose_T.
the CB healthy is 1 and last for 79_CBHealthy_T, such as, normal storage energy and no low
pressure signal
There is no blocked signal.
SIG
79AR_CB_Healthy
&
&
SIG79AR_Ready
SIG
79AR_CB_Open
SIG
79AR_On
1
79AR_T_CBclosed /
5ms
79AR_T_CBhealthy /
5ms
&
SIG
79AR_Blocked
Figure 3.22-3 AR Ready
The input signal 79AR_CB_Healthy must be energized before AR gets ready. Because most
circuit breakers can finish one complete process: open-closed-open, it is necessary that circuit
breaker has enough energy before reclosing. When AR is ready, if CB_Close become 0 from 1
and last for 400ms or CB_Healthy become 0 from 1 and last for 200ms, AR_Ready will drop off
and AR_NotServ BO will be initialized.
When auto-reclose is blocked, AR ready will be drop off immediately and next auto-reclosing will
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