ABB RELION 670 Series Applications Manual page 266

Section 12
Control
restarted when the conditions are fulfilled again. Circuit breaker closing is thus not permitted until
the energizing condition has remained constant throughout the set delay setting time.
12.2 Autorecloser for 1 phase, 2 phase and/or 3 phase
operation SMBRREC (79)
12.2.1 Identification
Function Description
Autorecloser for 1 phase, 2 phase and/or 3
phase
12.2.2 Application
In certain countries it is standard practice to provide delayed restoration after busbar protection
operation for internal fault, reason being that many busbar faults are of the transient natures that
is, animals, birds, storm, flying objects, etc. In such applications, typically one pre-selected feeder
is automatically closed with certain time delay in order to try to re-energize the faulty bus.
Typically, the longest overhead line is selected in order to limit the fault current in case of
permanent busbar fault. If the first feeder is successfully closed, all other feeder which have been
connected to the same bus, are automatically put back into service.
Sensitive differential protection level available in REB670 can be used during such operation, if
increased sensitivity from busbar protection is required. Such busbar restoration logic can be
implemented by using optionally available autoreclosing functions and built-in logical gates. Two
autoreclosing functions are available, one for each zone.
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, 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.
260
IEC 61850 IEC 60617
identification identification
SMBRREC
O->I
SYMBOL-L V1 EN-US
1MRK 505 337-UUS A
IP14559-1 v6
M14890-1 v6
ANSI/IEEE C37.2
device number
79
M12391-3 v7
Application manual