Functions
2.13 Flexible Protection Functions
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
195
2.13.2
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.
Introduction
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.
I
B
) or a ground variable (
I
G
).
The setting
no reference
allows to use external trip commands.
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 2-12
Parameter “Operating Mode” and “Measured Quantity”
Parameter
OPERRAT. MODE
Setting
Parameter
MEAS. QUANTITY
Setting Options
Single-phase,
Three-phase
Current
Without Reference
Binary Input