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 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.
Three-phase – functions evaluate the three-phase measuring system, i.e. all three phases are processed
simultaneously. 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 Ι
N
).
Setting no reference determines the evaluation of measured variables irrespective of a single or threep-
hase connection of current and voltage. Table 2-20 provides an overview regarding which variables can be
used in which mode of operation.
Parameter BLK f out of r allows you to specify whether the protection function is blocked if the meas-
ured power frequency is outside the operating range of the function (25 Hz to 70 Hz). SIEMENS recommends
using the default setting (YES). A release beyond the normal operating range is only required for special appli-
cations.
Measured Variable
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 dependent on the mode of measured-value processing as predefined in parameter
OPERRAT. MODE (see the following table).
Table 2-20
Parameter “Operating Mode” and “Measured Quantity”
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
3-phase
dV/dt rising
dV/dt falling
Without Reference
Frequency
df/dt rising
df/dt falling
Binary Input
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.
Functions
2.19 Flexible Protection Functions
274 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
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