Functions
2.6 Flexible Protection Functions
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
83
2.6.2 Setting Notes
The setting of the functional scope determines the number of flexible protection functions to be used (see
Chapter 2.1.1). If a flexible function in the functional scope is disabled (by removing the 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. Fur-
thermore, the OPERRAT. MODE can be configured:
3-phase – functions evaluate the three-phase measuring system, i.e. all three phases are processed simulta-
neously.
Single-phase functions evaluate only the individual measured value. This can be an individual phase value
(e.g V
B
) or U
x
or a ground variable (V
N
).
Setting no reference determines the evaluation of measured variables irrespective of a single or three-
phase connection of voltage. Table 2-6 provides an overview regarding which variables can be used in which
mode of operation.
Measured Quantity
In the setting dialog „Measured Variable“ the measured variables to be evaluated by the flexible protection func-
tions 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).
Table 2-7 Parameter “OPERRAT. MODE” and “MEAS. QUANTITY”
Parameter OPERRAT. MODE
Setting
Parameter MEAS. QUANTITY
Setting Options
Single-phase,
Three-phase
Voltage
Three-phase dV/dt rising
dV/dt falling
Without Reference Frequency
df/dt rising
df/dt falling
Binray Input
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