Functions
2.15 Flexible Protection Functions
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
187
2.15.2 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. A typical example is the three-phase operating time overcurrent protection.
Single-phase – functions evaluate only the individual measuring value. This can be an individual phase value
(e.g. V
B
) or a ground variable (V
N
or I
N
).
Setting no reference determines the evaluation of measured variables irrespective of a single or three-
phase connection of current and voltage. Table 2-6 provides an overview regarding which variables can be
used in which mode of operation.
Measured Variable:
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 dependent on the mode of measured-value processing as predefined in parameter
OPERRAT. MODE (see the following table).
Table 2-7 Parameter "Operating method" and "Measurand"
Measurement Methods
The measurement methods shown in the following tables can be parameterized for the measurands current,
voltage and power. Additionally, the dependencies of the available measurement methods on the parameter-
ized operating method and measurand are shown.
Parameter OPERRAT. MODE
Setting
Parameter MEAS. QUANTITY
Setting selection
1-phase,
3-phase
Current
Voltage
P forward
P reverse
Q forward
Q reverse
Power factor
without reference Frequency
df/dt rising
df/dt falling
Binary Input
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