9.4 Autoreclosing DARREC
9.4.1 Identification
Function description IEC 61850 logical
node name
IEC 60617
identification
ANSI/IEEE C37.2
device number
Autoreclosing DARREC O-->I 79
9.4.2 Function block
A070836-CN V1 EN
Figure 372: Function block
9.4.3 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 auto-reclose function AR can be used with any circuit breaker suitable for auto-
reclosing. The function provides five programmable auto-reclose shots which can
perform one to five successive auto-reclosings of desired type and duration, for
instance one high-speed and one delayed auto-reclosing.
When the reclosing is initiated with starting of the protection function, the auto-
reclose function can execute the final trip of the circuit breaker in a short operate
time, provided that the fault still persists when the last selected reclosing has been
carried out.
Section 9 1YHT530004D05 D
Control functions
692 615 series
Technical Manual
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