Description of Operation
GARD 8000 Distance Relay
RFL Electronics Inc.
Trip signal
Reclose initiate signal
Breaker open 52b
Recl. Cycle Time
Start time
Fail to Close Time
Security time
Fault inception
Breaker trip
Start check
Reclose
command
Reclose cycle
complete
Breaker closed
check
Breaker closed
check
Figure 9-69. Recloser lock-out operation
9.23.4
RECLOSER TIMER (DEAD TIME)
The Recloser Cycle Timer (dead time) is the time the breaker is allowed to remain open before a
reclose is attempted. Activation of the Reclose Command signal (Recl) generates the breaker closing
command signal.
When the Start Time state is reached, the corresponding timer will be started:
• The First Three-Pole Recloser Cycle Timer will start for the first reclosing attempt after a
three-pole trip.
• The Second or Third Recloser Cycle Timer will start for a second or third recloser cycle
If the recloser is manually blocked before the timer has timed out, the recloser changes to the Recloser
Reset status without reclosing. If the blocking signal is not activated during the timer countdown, the
Sync Check state is reached.
August 1, 2009
9-80
973.334.3100
