Siemens 6MD86 User Manual

Application and Setting Notes
Parameter: Directional mode
•
Default setting (_:8131:105) Directional mode = forward
You use the Directional mode parameter to define the directional mode of the stage.
Parameter Value Description
forward
Select this setting if the stage is to work in a forward direction (in the direc-
tion of the line).
reverse
Select this setting if the stage is to work in a reverse direction (in the direc-
tion of the busbar).
Parameter: Method of measurement
•
Recommended setting value (_:8131:8) Method of measurement = fundamental comp.
With the Method of measurement parameter, you define whether the stage uses the fundamental
comp. (standard method) or the calculated RMS value.
Parameter Value Description
fundamental comp.
Select this method of measurement if harmonics or transient current peaks
are to be suppressed.
Siemens recommends using this method as the standard method.
RMS value
Select this method of measurement if you want the stage to take harmonics
into account (for example, at capacitor banks). Consider that aperiodic DC
components present in the secondary circuit are measured and can cause
an overfunction.
For this method of measurement, do not set the threshold value of the
stage to less than 0.1 I
rated,sec
. If currents from more than one measuring
point are added up in the current interface of a function group, the setting
value should not be set lower than 0.1 I
rated,sec
multiplied by the number of
added currents.
Parameter: Directional comparison, Release via input signal
•
Default setting (_:8131:104) Directional comparison = no
•
Default setting (_:8131:106) Release via input signal = no
These 2 parameters are not visible in the basic stage.
You use these parameters to define whether the stage is to be used for directional comparison protection.
Directional comparison protection is performed via the Direction and >Release delay & op. signals.
Parameter Value
Description
no
The stage is not used for directional comparison protection.
yes
If the Directional comparison parameter is set to yes, the Release
via input signal parameter, the Direction output signal, and the
>Release delay & op. input signal become available.
If the Release via input signal parameter is set to yes, the start of
the time delay, and therefore also the operate signal of the stage, are only
enabled if the >Release delay & op. input signal is active. The
>Release delay & op. input signal must be connected to the release
information from the opposite end (forward information from the Direc-
tion output signal); see also the application example in chapter
7.6.10 Application Notes for Directional Comparison Protection .
7.6.4.2
Protection and Automation Functions
7.6 Directional Overcurrent Protection, Phases
672 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017

Siemens 6MD86 Specifications

General

Brand	Siemens
Model	6MD86
Category	Controller
Language	English