Functions
2.14 Automatic Reclosing System 79
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
264
If this behavior is not desired, the auto-reclose function can also generate the close command „79 Close“
directly which must be allocated to the associated contact. The CFC Chart as in Figure 2-99 is not needed in
this case.
Connection to the Internal Synchronism Check
The auto-reclose function can interact with the internal synchronization function of the device. If this is desired
as well as the Manual Close functionality, the CFC chart illustrated in Figure 2-99 is a definite prerequisite since
the synchronization function always interacts with the control function. Additionally, one of the four synchroni-
zation groups must be selected via parameter 7138 Internal SYNC. The synchronization conditions for au-
tomatic reclosure are are thereby specified. In that case the selected synchronization group defines the switch-
gear component to be used (usually the circuit breaker „52Breaker“). The defined switchgear component
and the one specified at 7137 Cmd.via control must be identical. Synchronous reclosing via the close
command „79 Close“ is not possible.
If interaction with the internal synchronization is not desired, the CFC Chart, as in Figure 2-99, is not required
and the parameter 7138 is set to none.
Automatic Reclosure with External Synchronism Check
Parameter 7139 External SYNC can be set to determine that the auto-reclose function operates with exter-
nal synchronism Check. An external synchronization is possible if the parameter is set to YES and the device
is linked to the external synchronization check via indication 2865 „79 Sync.Request“ and the binary input
„>Sync.release“.
Note: The automatic reclosure function cannot be connected to the internal and external synchrocheck at the
same time !
Initiation and Blocking of Automatic Reclosure by Protective Elements (configuration)
At addresses 7150 to 7167, reclosing can be initiated or blocked for various types of protection functions. They
constitute the interconnection between protection elements and auto-reclose function. Each address desig-
nates a protection function together with its ANSI synonym, e.g. 50-2 for the high-set element of the non-di-
rectional time overcurrent protection (address 7152).
The setting options have the following meaning:
• Starts 79 The protective element initiates the automatic reclosure via its trip command;
No influence the protective element does not start the automatic reclosure, it may however be initiated
by other functions;
Stops 79 the protective element blocks the automatic reclosure, it cannot be started by other functions; a
dynamic blocking is initiated.
Dead Times (1st AR)
Addresses 7127 and 7128 are used to determine the duration of the dead times of the 1st cycle. The time
defined by this parameter is started when the circuit breaker opens (if auxiliary contacts are allocated) or when
the pickup drops out following the trip command of a starter. Dead time before first auto-reclosure for reclosing
program "Phase" is set in address
7127 DEA
DTIME 1: PH, for reclosing program "ground" in address 7128
DEADTIME 1: G. The exact definition of the programs is described in the functional description at margin
heading "Reclosing Programs". The length of the dead time should relate to the type of application. With longer
lines they should be long enough to make sure that the fault arc disappears and that the air surrounding it is
de-ionized and auto-reclosure can successfully take place (usually 0.9 s to 1.5 s). For lines supplied by more
than one side, mostly system stability has priority. Since the de-energized line cannot transfer synchronizing
energy, only short dead times are allowed. Standard values are 0.3 s to 0.6 s. In radial systems longer dead
times are allowed.
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