Logic
[lo_TOLP_FilterStage, 1, en_US]
Figure 7-187
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 respective parameters
h(0)
,
h(1)
,
h(2)
,
h(3)
and
h(4)
.
i
i
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
Secon-
dary
% Referenced to
Iph:A
Filtered RMS measured
value of current A
kA
A
Parameter
Rated current
Iph:B
Filtered RMS measured
value of current B
kA
A
Parameter
Rated current
Iph:C
Filtered 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 Thermal over-
load protection, 3-phase - advanced function is used.
If the parameter
Enable filter
is set to
no
, the function values are shown as ---.
Application and Setting Notes
Parameter:
Enable filter
•
Default setting
(_:1) Enable filter
=
no
.
7.26.3.2
Protection and Automation Functions
7.26 Thermal Overload Protection, 3-Phase - Advanced
SIPROTEC 5, High-Voltage Bay Controller, Manual
879
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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