Application And Setting Notes - Siemens 6MD85 Manual

Siprotec 5 high-voltage bay controller

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[lo_TOLP_FilterStage, 1, en_US]

Figure 7-187

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).

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

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.

SIPROTEC 5, High-Voltage Bay Controller, Manual

C53000-G5040-C015-9, Edition 11.2017

Logic Diagram of the Function Block Filter

Filtered RMS measured

value of current A

Filtered RMS measured

value of current B

Filtered RMS measured

value of current C

Protection and Automation Functions

7.26 Thermal Overload Protection, 3-Phase - Advanced

% Referenced to

Parameter Rated current