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Parameter BLK.by Vol.Loss determines whether a function, with measured variable based on a voltage
measurement (measured variables voltage), should be blocked in case of a measured voltage failure/loss of
potential (set to YES) or not (set to NO).
The dropout ratio for the function can be set via the parameter DROPOUT RATIO. The standard dropout ratio
of protection functions is 0.95 (default setting). If the dropout ratio is decreased, it would be sensible to test
the pickup of the function regarding possible "chatter".
The dropout difference of the frequency elements is set under parameter DO differential. Usually, the
default setting of 0.02 Hz can be retained. A higher dropout difference should be set in weak systems with
larger, short-term frequency fluctuations to avoid chattering of the message.
The frequency change measured value (df/dt) works with a fixed dropout difference of 0.1 Hz/s.
The same applies to the voltage change (dU/dt) measurand. The permanent dropout difference here is 3 V/s.
Renaming Messages, Checking Configurations
After parameterization of a flexible function, the following steps should be noted:
•
Open matrix in DIGSI
•
Rename the neutral message texts in accordance with the application.
•
Check configurations on contacts and in operation and fault buffer, or set them according to the require-
ments.
Settings
2.6.3
Addresses which have an appended "A" can only be changed with DIGSI, under "Additional Settings".
Addr.
Parameter
0
FLEXIBLE FUNC.
0
OPERRAT. MODE
0
MEAS. QUANTITY
0
MEAS. METHOD
0
PICKUP WITH
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
Setting Options
OFF
ON
Alarm Only
3-phase
1-phase
no reference
Please select
Voltage
Frequency
df/dt rising
df/dt falling
Binray Input
dV/dt rising
dV/dt falling
Fundamental
True RMS
Positive seq.
Negative seq.
Zero sequence
Ratio I2/I1
Exceeding
Dropping below
Default Setting
Comments
OFF
Flexible Function
3-phase
Mode of Operation
Please select
Selection of Measured Quantity
Fundamental
Selection of Measurement Method
Exceeding
Pickup with
Functions
2.6 Flexible Protection Functions
77
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