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voltage input U
transformer is then invariably set to Usy2 transf. and excludes other setting options. Parameter 212
Usy2 connection is then set to determine which primary voltage is connected. The setting VT CONNECTION
= NO hides all voltage-relevant functions and parameters.
Parameter 107 CT CONNECTION is set to configure the current transformer connection. If the default setting
CT CONNECTION = YES is active, all current-induced functions (current criterion of voltage protection, line
status detection, measurements of currents and power, current-induced measured value monitoring) are oper-
ational. The setting CT CONNECTION = NO allows the device to be operated without any current transformer
connection; all current-induced functions and parameters are then hidden.
Address 110 Trip mode is only valid for devices that can trip single-pole or three-pole. Set 1-/3pole to
enable also single-pole tripping, i.e. if you want to utilise single-pole or single-pole/three-pole automatic reclo-
sure. This requires that an internal automatic reclosure function exists or that an external reclosing device is
used. Furthermore, the circuit breaker must be capable of single-pole tripping.
All functions are set to Disabled by default. This has no effect on the presetting of LEDs, binary inputs and
binary outputs.
Note
If you have changed address 110, save your changes first via OK and reopen the dialog box since the other
setting options depend on the selection in address 110.
If the device features an automatic reclosing function, address 133 and 134 are of importance. Automatic re-
closure is only permitted for overhead lines. It must not be used in any other case. If the protected object con-
sists of a combination of overhead lines and other equipment (e.g. overhead line in unit with a transformer or
overhead line/cable), reclosure is only permissible if it can be ensured that it can only take place in the event
of a fault on the overhead line. If no automatic reclosing function is desired for the feeder at which 7VK61 op-
erates, or if an external device is used for reclosure, set address 133 Auto Reclose to Disabled.
Otherwise set the number of desired reclosing attempts there. You can select 1 AR-cycle to 8 AR-cycles.
You can also set ADT (adaptive dead times); in this case the behaviour of the automatic reclosure function is
determined by the cycles of the remote end. The number of cycles must however be configured at least in one
of the line ends which must have a reliable infeed. The other end — or other ends, if there are more than two
line ends — may operate with adaptive dead time. Section 2.2 provides detailed information on this topic.
The AR control mode at address 134 allows a total of four options. On the one hand, it can be determined
whether the auto reclose cycles are carried out according to the fault type detected by the pickup of the starting
protective function(s) (only for three-pole tripping) or according to the type of trip command. On the other
hand, the automatic reclosure function can be operated with or without action time.
The setting Trip with T-action / Trip without T-action ... (default setting = With trip command
... ) is to be preferred if single-pole or single-pole/three-pole auto reclose cycles are provided for and possible.
In this case, different dead times (for every AR cycle) are possible after single-pole tripping and after three-pole
tripping. The protective function that issues the trip command determines the type of trip: Single-pole or three-
pole. The dead time is controlled dependent on this.
The setting Pickup with T-action / Pickup without T-action ... is only possible and visible if only three-pole
tripping is desired i.e., if only three-pole tripping is configured (address 110 Trip mode = 3pole only, see
above). In this case you can set different dead times for the auto-reclose cycles following single-pole, two-pole
and three-pole faults. The decisive factor here is the pickup situation of the protective functions at the instant
the trip command disappears. This control mode enables also the dead times to be made dependent on the
type of fault in the case of three-pole reclosure cycles. Tripping is always three-pole.
The setting Trip with T-action provides an action time for each reclose cycle. The action time is started
by a general pickup of all protective functions. If no trip command is present before the action time expires, the
corresponding reclose cycle is not carried out. Section 2.2 provides detailed information on this topic. This
setting is recommended for time-graded protection. If the protection function which is to operate with automatic
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
is always interpreted as the voltage U
4
which is to be synchronized. Parameter 210 U4
Sy2
Functions
2.1 General
25
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