10.2.1 Identification
Function Description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Autorecloser for 3-phase operation SMBRREC
SYMBOL-L V1 EN
79
10.2.2 Application
Automatic reclosing is a well-established method for the restoration of service in a power
system after a transient line fault. The majority of line faults are flashover arcs, which are
transient by nature. When the power line is switched off by the operation of line protection
and line breakers, the arc de-ionizes and recovers its ability to withstand voltage at a
somewhat variable rate. Thus, a certain dead time with a de-energized line is necessary.
Line service can then be resumed by automatic reclosing of the line breakers. The dead
time selected should be long enough to ensure a high probability of arc de-ionization and
successful reclosing.
For individual line breakers, auto-reclosing equipment or functions, the auto-reclosing
open time is used to determine line “dead time”. When simultaneous tripping and
reclosing at the two line ends occurs, auto-reclosing open time is approximately equal to
the line “dead time”. If the open time and dead time differ then, the line will be energized
until the breakers at both ends have opened.
Section 10 1MRK 511 286-UUS A
Control
198
Application manual
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