Siemens siprotec SJ62 User Manual page 244

Action Time
Delay of Dead Time
Start
Number of Reclos-
ing Attempts
Close Command:
Direct or via
Control
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
The breaker failure monitoring time 7114 T-Start MONITOR determines the time
between tripping (closing the trip contact) and opening the circuit breaker (checkback
of the CB auxiliary contacts). This time is started each time a tripping operation takes
place. When time has elapsed, the device assumes breaker failure and blocks the
auto-reclose system dynamically.
The action time monitors the time between interrogation of the device and trip
command of a protective function configured as starter while the auto-reclosure
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
function. 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 trip-
ping 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.
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 functional descrip-
tion at margin heading "Delay of Dead Time Start".
The number of reclosing attempts can be set separately for the "phase program" (ad-
dress 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".
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 AR is to be intended to close via the control function, the Manual Close command
has to be suppressed during an automatic reclose command. The example in Section
2.2.10 of a MANUAL CLOSE for commands via the integrated control function, has to
be extended in this case (see Fig. 2-85). It is detected via the annunciations 2878 „79
L-N Sequence" and 2879 „79 L-L Sequence" that the automatic reclosure has
been started and a reclosure will be initiated after the dead time. The annunciations
set the flipflop and suspend the manual close signal until the AR has finished the re-
closure attempts. The flipflop is reset via the OR-combination of the annunciations
2784 „79 is NOT ready", 2785 „79 DynBlock" and 2862 „79 Successful".
ManCl is initiated if a CLOSE command comes from the control function.
2.14 Automatic Reclosing System 79
242