Functions
172
7SS52 V4 Manual
C53000-G1176-C182-3
5.9.8 Setting Notes
Tmin TRIP The parameter Tmin TRIP (6106/CU) is used to set the minimum time that must
elapse before the TRIP command is reset. This time is started with the output of a
TRIP command.
In general, a TRIP command is reset via the current flow control (see Chapter 5.9.1,
page 167). If non-energized feeders, e.g. radial feeders, are tripped without any feed-
back, a safe reset of the TRIP command to the circuit breaker trip coil can instead be
ensured with the parameter Tmin TRIP (6106/CU). The setting must be higher than
the maximum circuit breaker closing time.
Local
control of BU
The parameter CTRL REL BU (6318/CU) is used to release or block changes of the
bay unit parameter Bay status (XX12/CU) locally on the bay units. This applies only
to the feeder settings out of service and maintenance. It affects also the pos-
sibility to change the operating status by means of the function keys F1 and F3 on the
bay unit operator panel.
With setting released, changes of the bay unit parameter Bay status (XX12/CU)
from the bay units is released.
With setting blocked, changes to the bay unit parameter Bay status (XX12/CU)
locally from the bay units are blocked. Attempts to take a bay unit locally out of service
are rejected as ”NOT PERMITTED”.
PROT TR BUS The parameter PROT TR BUS (5401/CU) is used to activate and deactivate the se-
lective protection of a transfer busbar. The basic setting is NO.
With setting released the protection of the transfer busbar will be on. This setting
only makes sense in configurations with external current transformers.
With setting blocked the protection of the transfer busbar will be off.
Test mode SK The parameter Test mode SK (5108A/CU) is used to activate and deactivate the
test mode for the ZPS-SK module (Chapter 8.2.4, page 295). Siemens recommends
to block all TRIP commands.
With test mode ON, the protection is blocked.
Note
The parameter T TRIP (1141/BU) can only be set with the bay unit running in
stand-alone mode. If the bay unit is connect
ed with the central unit, the setting of
this parameter is overwritten by the central unit Tmin TRIP (6106/CU).
With the bay unit linked to the central unit, the setting of this parameter is transmitted
from the central unit to the bay units. The local setting in the bay units is overwritten.
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