Functions
6-188 7SA6 Manual
C53000-G1176-C133-1
ready for a CLOSE–TRIP–cycle. The maximum extension is by the circuit-breaker–
monitoring time; which was set for all reclosure cycles under address (see
above). Details about the circuit-breaker–monitoring can be found in the function
description, section 6.12.1, under subtitle “Interrogation of Circuit-Breaker Ready”,
page 6-171.
If there is a risk of stability problems in the network during a three-pole interruption,
the setting in address $'76\Q5HTXHVW should be <HV. In this case the voltage
of the line and busbar are checked after a three pole trip and before reclosure to
determine if sufficient synchronism exists. This assumes that the device has a voltage
and synchronism check capability or that an external device is available for this
purpose. If only single-pole reclosure cycles are executed or no stability problems are
expected during three-pole dead times (e.g. due to close meshing of the network or in
radial networks), set address to 1R.
Addresses and are only significant if the
voltage-controlled
adaptive dead
time is used. Set under address 8OLYH! the limit voltage phase–earth above
which the line is considered to be fault-free. The setting must be smalIer than the
lowest expected operating voltage. The setting is applied in Volts secondary. This
value can be entered as a primary value when parametrizing with a PC and DIGSI
®
4.
Address 78VWDEOH determines the measuring time used to determine that
the line is fault free with this return voltage. It should be longer than any transient
oscillations resulting from line energization.
1st Reclosure
Cycle
If working on a line with adaptive dead time, no further parameters are needed for the
individual reclose cycles here. All the following parameters assigned to the individual
cycles are then superfluous and inaccessible.
Address $567$57 is only available if the automatic reclosure is configured
with action time in the operating mode, i. e. if address $5FRQWUROPRGH =
3LFNXSZ7DFW or 7ULSZ7DFW was set when configuring the protection
functions (the first setting only applies to three-pole tripping). It determines whether
automatic reclosure should be started at all with the first cycle. This address is
included mainly for the sake of uniformity of the parameters for all the reclosure cycles
and must be set to <HV for the first cycle. If several cycles are used it is possible to
control (in control mode
with PICKUP
) the effect of the individual cycles with this
parameter and various action times. Notes and examples can be found in section
6.12.1 under subtitle “Action Times” (page 6-169).
The action time $57$&7,21 (address) is the time after pickup (fault detection)
by any protective function which can start the automatic reclosure function within
which the trip command must appear. If the command does not appear until after the
action time has expired, there is no reclosure. Depending on the configuration of the
protective functions (see section 5.1) the action time may also be omitted; this applies
especially when an initiating protective function has no fault detection signal.
Depending on the configured operating mode of the automatic reclosure (see section
5.1 under address $5FRQWUROPRGH) only addresses and (if
control mode ZLWK75,3) or the addresses to (if operating mode
with
PICKUP
) are available.
In the control mode ZLWK75,3 it is possible to set different dead times for single-pole
and three-pole reclose cycles. Whether single-pole or three-pole tripping takes place
depends solely on the initiating protection functions. Single-pole tripping is only
possible of course if the device and the corresponding protection function are also
capable of single-pole tripping.
Address $57GHDG7ULS is the dead time after 1-pole tripping,
Address $57GHDG7ULS is the dead time after 3-pole tripping.
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