Functions
2.17 Flexible Protection Functions
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
289
2.17.2 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 2-20 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 dependant on the mode of measured-value processing as predefined in parameter
OPERRAT. MODE (see the following table).
Table 2-21 Parameter “Mode of Operation” and “Measured Variable”
Measurement Procedures
The measurement procedures as set out in the following table can be configured for the measured variables -
current, voltage and power. The dependencies of the available measurement procedures of configurable
modes of operation and the measured variable are also indicated.
Parameter OPERRAT. MODE
Setting
Parameter MEAS. QUANTITY
Setting Options
Single-phase,
Three-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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