Functions
2.11 Automatic Reclosing System 79
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
175
Action Time
The action time monitors the time between pickup of the device and trip command of a protective function con-
figured as starter while the automatic reclosing system is ready but not yet running. A trip command issued by
a protective function configured as starter occurring within the action time will start the automatic reclosing func-
tion. If this time differs from the setting value of
T-ACTION
(address
7117
), the automatic reclosing system will
be blocked dynamically. The trip time of inverse tripping characteristics is considerably determined by the fault
location or fault resistance. The action time prevents reclosing in case of far remote or high-resistance faults
with long tripping time. Trip commands of protective functions which are not configured as starter do not affect
the action time.
Delay of Dead Time Start
The dead time start can be delayed by pickup of the binary input message 2754
„>79 DT St.Delay“
. The
maximum time for this can be parameterized under
7118
T DEAD DELAY
. The binary input message must be
deactivated again within this time in order to start the dead time. The exact sequence is described in the func-
tional description at margin heading "Delay of Dead Time Start".
Number of Reclosing Attempts
The number of reclosing attempts can be set separately for the "phase program" (address
7136
# OF RECL.
PH
) and "ground program" (address
7135
# OF RECL. GND
). The exact definition of the programs is described
in the functional description at margin heading "Reclosing Programs".
Close Command: Direct or via Control
Address
7137
Cmd.via control
can be set to either generate directly the close command via the automatic
reclosing function (setting
Cmd.via control
=
none
) or have the closing initiated by the control function.
If the automatic reclosing system is to be close via the control function, the Manual Close command has to be
suppressed during an automatic reclose command. The example in the section 2.2.10 of a MANUAL CLOSE
for commands via the integrated control function has to be extended in this case (see Figure 2-60). The mes-
sages 2878
„79 L-N Sequence“
and 2879
„79 L-L Sequence“
indicate that the AR has been started
and wants to carry out a reclosure after the dead time. The annunciations set the flipflop and suspend the
manual signal until the AR has finished the reclosure attempts. The flipflop is reset via the OR-combination of
the annunciations 2784
„79 is NOT ready“
, 2785
„79 DynBlock“
and 2862
„79 Successful“
. Manual
closing is initiated if a CLOSE command comes from the control function.