21/07/2010
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MRAR 01/96 C
5.7.2 Two Time Programming of the Unit, Reclosing Unsuccessful.
Protection Energised
tD1
tD2
Short Circuit
Protection Tripped
Circuit Breaker
Switch on Command
tD1 = Dead Time 1
tD1 = Dead Time 2
Here the chronological sequence is as described in paragraph 5.7.1. The second reclosing shot is
however unsuccessful and thus the unit is blocked.
5.7.3 Manual Switching On of the Circuit Breaker to Faulty Lines
Protection Energised
Short Circuit
Protection Tripped
Circuit Breaker
Switch on Command
1 = Manual On
2 = Protection Tripped
1
2
The MRAR is in the inactive state when the circuit breaker is switched off. When the circuit breaker is
manually switched on, the reclaim time is started. Should there be a fault on the line during the switch
on procedure, the circuit breaker is switched off again via the protection device and the reclaim time is
stopped. The MRAR then changes back to the inactive state.