Siemens SIPROTEC 7SJ62 Manual page 263

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 2.2.11 of a MANUAL CLOSE
for commands via the integrated control function has to be extended in this case (see Figure 2-99). 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.
Figure 2-99 CFC logic for Manual Close with automatic reclosing via control
The selection list for parameter 7137 is created dynamically depending on the allocated switchgear compo-
nents. If one of the switchgear components is selected, usually the circuit breaker „52Breaker", reclosure is
accomplished via control. In this case, the automatic reclosure function does not create a close command but
issues a close request. It is forwarded to the control which then takes over the switching. Thus, the properties
defined for the switchgear component such as interlocking and command times apply. Hence, it is possible that
the close command will not be carried out due to an applying interlocking condition.
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Functions
2.14 Automatic Reclosing System 79
263