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Functions
2.6 Flexible Protection Functions
present and the binary input has been activated. The trip command can be blocked via binary inputs (no.
235.2115
>$00 BL.TripA ) and (no. 235.2114 >$00 BLK.TRIP ). The phase-selective blocking of the trip
command is required for interaction with the inrush restraint (see "Interaction with other functions"). The
function's dropout ratio can be set. If the threshold (>-element) is undershot after the pickup, the dropout
time delay will be started. The pickup is maintained during that time, a started trip delay time continues to
count down. If the trip time delay has elapsed while the dropout time delay is still during, the trip command
will only be given if the current threshold is exceeded. The element will only drop out when the dropout time
delay has elapsed. If the time is set to zero, the dropout will be initiated immediately once the threshold is
undershot.
External Trip Commands
The logic diagram does not explicitly depict the external trip commands since their functionality is analogous.
If the binary input is activated for external trip commands (no. 235.2112
treated as threshold overshooting, i.e. once it has been activated, the pickup time delay is started. If the
pickup time delay is set to zero, the pickup condition will be reported immediately starting the trip time delay.
Otherwise, the logic is the same as depicted in
Interaction with Other Functions
The pickup message of the flexible function is included in the general fault detection, and tripping in the
general trip (see Chapter
general trip therefore also apply to the flexible function.
The trip commands by the flexible protection function are maintained after reset of the pickup for at least the
configured minimum trip-command duration 210 TMin TRIP CMD.
Setting Notes
2.6.2
The setting of the functional scope determines the number of flexible protection functions to be used (see
Section
2.1.1 Functional
checkmark), this will result in losing all settings and configurations of this function or its settings will be reset
to their default settings.
General
In the DIGSI setting dialog "General", parameter FLEXIBLE FUNC. can be set to OFF, ON or Alarm Only. If
the function is enabled in operational mode Alarm Only, no faults are recorded, no "Effective"indication is
generated, no trip command issued and neither will the circuit-breaker protection be affected. Therefore, this
operational mode is preferred when a flexible function is not required to operate as a protection function.
Furthermore, the OPERRAT. MODE can be configured:
3-phase – functions evaluate the three-phase measuring system, i.e. all three phases are processed simultane-
ously.
1-phase functions evaluate only the individual measured value. This can be an individual phase value (e.g V
or V
or a ground variable (V
x
Setting no reference determines the evaluation of measured variables irrespective of a single or threep-
hase connection of voltage.
mode of operation.
Measured Quantity
In the setting dialog "Measured Variable" the measured variables to be evaluated by the flexible protection
functions can be selected, which may be a calculated or a directly measured variable. The setting options that
can be selected here are dependant on the mode of measured-value processing as predefined in parameter
OPERRAT. MODE (see the following table).
74
Figure
2.11 Function
Logic). All functionalities linked to the general fault detection and
Scope). If a flexible function in the functional scope is disabled (by removing the
).
N
Table 2-6
provides an overview regarding which variables can be used in which
>$00 Dir.TRIP ), it will be logically
2-20.
C53000-G1140-C233-4, Edition 07.2018
)
B
SIPROTEC 4, 7RW80, Manual
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