Table of Contents
Advertisement
Parameter Value
RMS value
Parameter: Directional comparison, Release via input signal
•
Default setting (_:8161:110) Directional comparison = no
•
Default setting (_:8161:112) 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
no
yes
Parameter: Non-directional pickup
•
Recommended setting value (_:8161:113) Non-directional pickup = at volt.< &
mem.empty
This parameter is not visible in the basic stage.
Parameter Value
at volt.< & mem.empty
no
Parameter: Type of character. curve
•
Default setting (_:8161:130) Type of character. curve = IEC normal inverse
The device offers all the usual inverse-time characteristic curves according to IEC and ANSI. Select the Type
of character. curve required for your specific application.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Description
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
point are added up in the current interface of a function group, the setting
value should not be set lower than 0.1 I
added currents.
Description
The stage is not used for directional comparison protection.
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
6.6.10 Application Notes for Directional Comparison Protection
Description
Select this setting if the stage is to pick up in a non-directional manner if the
voltage memory is empty and determining of direction has to be performed
at low voltages (3-phase close-up fault). An empty voltage memory may
exist, for example, if there is a voltage transformer at the line end and the
CB trips.
Siemens recommends using the default setting.
Select this setting if determining of direction is required under all circum-
stances, that is, even in the event of pickup on a 3-phase close-up fault.
Protection and Automation Functions
6.6 Directional Overcurrent Protection, Phases
. If currents from more than one measuring
multiplied by the number of
rated,sec
.
423
Advertisement
Table of Contents
