Table of Contents
Advertisement
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:
Three-phase – functions evaluate the three-phase measuring system, i.e. all three phases are processed si-
multaneously. A typical example is the three-phase operating time overcurrent protection.
Single-phase functions evaluate only the individual measured value. This can be an individual phase value
(e.g. V
) or V
B
x
Setting no reference determines the evaluation of measured variables irrespective of a single or three-
phase connection of current and voltage. Table 2-13 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 measured
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 applications.
Measured values
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 2-14
Parameter OPERRAT. MODE
Setting
Single-phase,
Three-phase
3-phase
Without Reference
The power values are not available if you are using a capacitive voltage connection or if you have selected the
setting Vab, Vbc or Vab, Vbc, Vx as connection type for the voltage transformers in address 213 VT
Connect. 3ph.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
or a ground value (V
, I
N
N
Parameter "Operating Mode" and "Measured Quantity"
Parameter MEAS. QUANTITY
Setting Options
Current
Voltage
P forward
P reverse
Q forward
Q reverse
Power factor
dV/dt rising
dV/dt falling
Frequency
df/dt rising
df/dt falling
Binray Input
or I
).
N2
Functions
2.15 Flexible Protection Functions
229
Advertisement
Table of Contents
