Siemens SIPROTEC 4 7VK61 Manual page 61

ping is allowed, 1- pole tripping will be prevented during the reclaim time. Each fault is thus disconnected in
three poles while the reclaim time is active.
Address 3403 T-RECLAIM allows disabling the reclaim time in ADT mode. In doing so, the ADT cycle including
its settings and release conditions is restarted after unsuccessful automatic reclosing. If the reclaim time is
activated, the 1-pole trip permission at address 3435 and the protection releases are disabled while the
reclaim time is running.
Under address 3436 ADT CB? CLOSE it can be determined whether circuit breaker ready is interrogated
before reclosure after an adaptive dead time. With the setting YES, the dead time may be extended if the
circuit breaker is not ready for a CLOSE–OPEN–cycle when the dead time expires. The maximum extension
that is possible is the circuit breaker monitoring time; this was set for all reclosure cycles under address 3409
(see above). Details about the circuit breaker monitoring can be found in the function description, Section
2.2 Automatic reclosure function
State".
If there is a danger of stability problems in the network during a 3-pole reclosure cycle, set address 3437 ADT
SynRequest to YES. In this case a check is made before reclosure following a 3-pole trip whether the
voltages of feeder and busbar are sufficiently synchronous. This is only done on condition that either the
internal synchronism and voltage check functions are available, or that an external device is available for
synchronism and voltage check. If only 1-pole reclose cycles are executed or if no stability problems are
expected during 3-pole dead times (e.g. due to closely meshed networks or in radial networks), set address
3437 to NO.
Addresses 3438 and 3440 are only significant if the voltage-controlled adaptive dead time is used. 3440 U-
live> is the phase-to-earth voltage limit above which the line is considered to be fault-free. The setting must
be smaller than the lowest expected operating voltage. The setting is applied in volts secondary. This value
can be entered as a primary value when parameterising with a PC and DIGSI. Address 3438 T U-stable
defines the measuring time used to determine the voltage. It should be longer than any transient oscillations
resulting from line energization.
The adaptive dead time is only available if address 106 VT CONNECTION is set to dreiphasig.
1st reclose cycle
If working on a line with adaptive dead time, no further parameters are needed for the individual reclose
cycles in this case. All the following parameters assigned to the individual cycles are then superfluous and
inaccessible.
Address3450 1.AR: STARTis only available if the automatic reclosing function works in the operating mode
with action time, i.e. is set during configuration of the protection functions at address 134 AR control
mode = Pickup w/ Tact or Trip w/ Tact (the first setting only applies to 3-pole tripping). It determines
whether automatic reclosure should be started at all with the first cycle. This address is included mainly due to
the uniformity of the parameters for every reclosure attempt and is set to YES for the first cycle. If several
cycles are performed, you can (at AR control mode = Trip ...) set this parameter and different action
times to control the effectiveness of the cycles. In Section
and examples are at margin heading "Action times".
The action time 1.AR: T-ACTION (address 3451) is started after a protection function has triggered the
automatic reclosing function. The trip command must occur during this time. If no trip command is issued
until the action time has expired, reclosing will not be initiated. Depending on the configuration of the protec-
tion functions, the action time may also be omitted; this applies especially when an initiating protection func-
tion has no fault detection signal.
Depending on the configured operating mode of the automatic reclosure (address 134 AR control mode)
only the addresses 3456 and 3457 (if AR control mode = TRIP...) or the addresses 3453 to 3455 are
available (if AR control mode = Pickup. ...).
In AR control mode = TRIP ... you can set different dead times for 1-pole and 3-pole reclose cycles.
Whether 1-pole or 3-pole tripping is triggered depends solely on the initiating protection functions. 1-pole trip-
ping is of course only possible if the device and the corresponding protection function are also capable of 1-
pole tripping:
Table 2-1
3456 1.AR Tdead1Trip
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
(optional), at margin heading "Interrogation of the Circuit Breaker Ready
AR control mode = TRIP ...
is the dead time after 1-pole tripping.
2.2 Automatic reclosure function (optional)
2.2 Automatic reclosure function (optional)
Functions
notes
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