is, autoreclose shots are allowed. If none of the trials is successful and the fault
persists, definite final tripping follows.
The autoreclose function can be used with every circuit breaker that has the ability for
a reclosing sequence. In DARREC autoreclose function the implementing method of
autoreclose sequences is patented by ABB
Table 663: Important definitions related to auto-reclosing
autoreclose shot an operation where after a preset time the breaker is closed from the breaker
tripping caused by protection
autoreclose
sequence
a predefined method to do reclose attempts (shots) to restore the power system
SOTF If the protection detects a fault immediately after an open circuit breaker has been
closed, it indicates that the fault was already there. It can be, for example, a
forgotten earthing after maintenance work. Such closing of the circuit breaker is
known as switch on to fault. Autoreclosing in such conditions is prohibited.
final trip
Occurs in case of a permanent fault, when the circuit breaker is opened for the last
time after all programmed autoreclose operations. Since no auto-reclosing follows,
the circuit breaker remains open. This is called final trip or definite trip.
9.4.6.1 Shot initiation
A070869 V1 EN
Figure 339: Example of an autoreclosing program with a reclose scheme matrix
1MRS758755 A Section 9
Control functions
REC615 and RER615 649
Technical Manual
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