Application And Setting Notes - Siemens 7SJ82 Manual

Protection and Automation Functions
6.3 Overcurrent Protection, Phases
Dropout Delay (Advanced Stage)
If the value falls below the dropout threshold, the dropout can be delayed. The pickup is maintained for the
specified time. The tripping delay continues to run. If the time delay expires while the pickup is still main-
tained, the stage operates.
Blocking of the Stage (Basic and Advanced Stage)
The following blockings reset the picked up stage completely:
•
Via the binary input signal >Block stage from an external or internal source
•
Via the functionality of the dynamic settings (only available in the Advanced function type, see
subtitle Influence of other functions via dynamic settings and chapter
Blocking of the Time Delay (Basic and Advanced Stage)
You can use the binary input signal >Block delay & op. to prevent the start of the time delay and thus
also the operate signal. A running time delay is reset. The pickup is indicated and the fault logging and
recording takes place.
Blocking of the Operate Delay and the Operate Signal via the Device-Internal Inrush-Current Detection Function
(Basic and Advanced Stage)
Blocking of the operate delay and the operate signal via the device-internal Inrush-current detection function
is described in chapter
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
6.3.4.2

Application and Setting Notes

Parameter: Method of measurement
•
Default setting (_:661:8) 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
332
6.3.7.1 Description .
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
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.
6.3.8.1 Description
6.3.8.1 Description
. If currents from more than one measuring
rated,sec
multiplied by the number of
rated,sec
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
).
.