The filter gain (amplitude response) is realized by a 9-order FIR filter.
Logic
[lo_TOLP_FilterStage, 1, en_US]
Figure 7-60 Logic Diagram of the Function Block Filter
The FIR filter gains the 8-kHz sampled values according to the set filter coefficients. Afterwards, the RMS value
is calculated. The symmetrical 9-order filter coefficients are set via the values of the respective parameters
h(0), h(1), h(2), h(3), and h(4).
NOTE
A FIR-filter configuration tool is provided as an auxiliary PC tool. With this PC tool, the coefficients h(0),
h(1), h(2), h(3), h(4) of the FIR filter are generated according to the required gain factors (amplitude
response). The tool can be obtained from the SIPROTEC download area. For more information about the
tool, refer to the tool help function.
The gained RMS value is delivered to the protection stages only when the function block Filter is instantiated
and the parameter Enable filter is set as yes. Otherwise, the normal RMS value is used.
Functional Measured Values
Values
Description Primary Secondary % Referenced to
Iph:A Gained RMS measured
value of current A
kA A Parameter Rated current
Iph:B Gained RMS measured
value of current B
kA A Parameter Rated current
Iph:C Gained RMS measured
value of current C
kA A Parameter Rated current
You can find the parameter Rated current in the FB General of function groups where the Overcurrent
protection, phases – advanced function is used.
If the parameter Enable filter is set to no, the functional measured values are shown as ---.
Application and Setting Notes
Parameter: Enable filter
•
Default setting (_:1) Enable filter = no.
7.4.3.2
Protection and Automation Functions
7.4 Overcurrent Protection, Phases
600 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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