ABB RER620 Technical Manual page 301

1MAC309294-MB F
RER620
Technical Manual
• Both: the automatic initiation is allowed when synchronization fails or the circuit
breaker does not close.
The Auto init parameter defines which INIT_X lines are activated in the
auto-initiation. The default value for this parameter is "0", which means
that no auto-initiation is selected.
Figure 151: Example of an auto-initiation sequence with synchronization failure in the
first shot and circuit breaker closing failure in the second shot
In the first shot, the synchronization condition is not fulfilled (SYNC is FALSE). When the
auto wait timer elapses, the sequence continues to the second shot. During the second
reclosing, the synchronization condition is fulfilled and the close command is given to the
circuit breaker after the second reclose time has elapsed.
After the second shot, the circuit breaker fails to close when the wait close time has
elapsed. The third shot is started and a new close command is given after the third reclose
time has elapsed. The circuit breaker closes normally and the reclaim time starts. When the
reclaim time has elapsed, the sequence is concluded successful.
Shot initiation and shot sequencing Possibilities
The autoreclose function is initiated after the protection has detected a fault, issued a trip
and opened the breaker. One input is enough for initiating the function.
The function consists of six individual initiation lines INIT_1, INIT_2... INIT 6.
The user can use as many of the initiation lines as required. Using only one line makes
setting easier, whereas by using multiple lines, higher functionality can be achieved.
Basically, there are no differences between the initiation lines.
Section 5
Control functions
295