The phase current I
phx-elim.
is necessary for the following protection process.
If the Method of measurement parameter is set to fundamental comp., the I0 elimination is operating.
The currents I
phx-elim.
are available as functional values.
Pickup Delay (Advanced Stage)
If the current exceeds the threshold value, the pickup delay starts. If the threshold is exceeded during the
pickup delay time, the pickup signal is generated.
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 6.3.8.1 Description ).
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 6.3.7.1 Description .
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 6.3.8.1 Description .
Application and Setting Notes
Parameter: Method of measurement
•
Recommended setting value (_:691:8) 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.
6.3.5.2
Protection and Automation Functions
6.3 Overcurrent Protection, Phases
SIPROTEC 5, Overcurrent Protection, Manual 343
C53000-G5040-C017-8, Edition 07.2017
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