Application And Setting Notes - Siemens 7SJ82 Manual

Protection and Automation Functions
6.6 Directional Overcurrent Protection, Phases
Influence of Other Functions via Dynamic Settings (Advanced Stage)
If available in the device, the following functions can influence the overcurrent-protection stages:
•
Automatic reclosing
•
Cold-load pickup detection
•
Binary input signal
The influence of these functions via dynamic settings is described in chapter

Application and Setting Notes

6.6.4.2
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
forward
reverse
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
fundamental comp.
RMS value
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
no
414
Description
Select this setting if the stage is to work in a forward direction (in the direc-
tion of the line).
Select this setting if the stage is to work in a reverse direction (in the direc-
tion of the busbar).
Description
Select this method of measurement if harmonics or transient current peaks
are to be suppressed.
Siemens recommends using this method as the standard method.
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.
6.3.8.1 Description
. If currents from more than one measuring
multiplied by the number of
rated,sec
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
.