1MAC050144-MB C
Section 7
Control functions
615 series ANSI
485
Technical Manual
7.2
Auto-reclosing 79
7.2.1
Identification
7.2.2
Function block
Figure 258:
Function block
7.2.3
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 autoreclose function AR can be used with any circuit breaker suitable for
autoreclosing. The function provides five programmable autoreclose shots which can
perform one to five successive autoreclosing of desired type and duration, for instance one
high-speed and one delayed autoreclosing.
When the reclosing is initiated with pickup of the protection function, the autoreclose
function can execute the final trip of the circuit breaker in a short trip time, provided that
the fault still persists when the last selected reclosing has been carried out.
7.2.3.1
Protection signal definition
The
Control line
setting defines which of the initiation signals are protection pickup and
trip signals and which are not. With this setting, the user can distinguish the blocking
Function description
IEC 61850 logical
node name
IEC 60617
identification
ANSI/IEEE C37.2
device number
Auto-recloser
DARREC
O-->I
79
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