ABB RELION REF615R, Technical Manual

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9.2 Autoreclosing 79
9.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Autoreclosing DARREC O -> I 79
9.2.2 Function block
A070836-ANSI V1 EN
Figure 235: Function block
9.2.3 Functionality
About 80 to 85 percent of faults in the MV overhead lines are transient and automatically
cleared with a momentary de-energization of the line. The rest of the faults, 15 to 20
percent, can be cleared by longer interruptions. The de-energization of the fault location
for a selected time period is implemented through automatic reclosing, during which most
of the faults can be cleared.
In case of a permanent fault, the automatic reclosing is followed by final tripping. A
permanent fault must be located and cleared before the fault location can be re-energized.
The autoreclosing function 79 can be used with any circuit breaker suitable for
autoreclosing. The function provides five programmable autoreclosing shots which can
perform one to five successive autoreclosings of desired type and duration, for instance
one high-speed and one delayed autoreclosing.
1MRS240050-IB C
Section 9
Control functions
REF615R 457
Technical Manual