sepam 20 user manual - Schneider Electric

3
MT10879
MT10880
Protection functions Recloser
ANSI code 79
Example 1: case of successful reclosing after the first cycle. Activation with 300 ms time-delayed O/C protection
Instantaneous O/C
Time-delayed O/C
I12 (closed position)
CB open command
I11 (open position)
CB close command
Reclosing in
progress (TS35)
Reclosing
successful (TS37)
Example 2: case of definitive tripping after two cycles activated by 300 ms time-delayed O/C protection
Instantaneous O/C
Time-delayed O/C
I12 (closed position)
CB open command
I11 (open position)
CB close command
Reclosing in
progress (TS35)
Definitive tripping
(TS37)
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inhibition time
delay
300 ms
inhibition time delay
cycle 1 isolation time delay
300 ms 300 ms 300 ms
cycle 1
isolation time
delay
cycle 2
isolation
time delay
“cleared fault”
message
“permanent fault”
message
disengagement
time delay
PCRED301005EN - 06/2008