ABB Relion REQ650, Applications Manual

Page: 217 / 340

AutoCont and tAutoContWait, Automatic continuation to the next shot if
the CB is not closed within the set time
The normal setting is AutoCont = Off . The tAutoContWait is the length of time
SMBRREC waits to see if the breaker is closed when AutoCont is set to On . Normally,
the setting can be tAutoContWait = 2 sec .
10.3 Autorecloser for 1/3-phase operation STBRREC
10.3.1 Identification
Function Description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Autorecloser for 1/3-phase operation STBRREC
O->I
SYMBOL-L V1 EN
79
10.3.2 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 autoreclosing
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.
1MRK 505 291-UEN A
Section 10
Control
211
Application manual