Functional Test of the Inrush-Current Detection
General
²
For the test, make sure that the test current reflects the typical inrush current.
²
Perform the test with transient signals. These can be recorded inrush currents or simulated currents from
a transient system model.
²
When using synthetic signals, observe the notes on the individual measuring principles.
Harmonic Analysis
²
Superimpose on the fundamental-component current a test current of double frequency (2nd harmonic)
and test the pickup behavior with this.
²
Cause a threshold value excess (internal pickup) for one of the protection functions that you want to
block.
- or -
²
Apply a test current with a load current as lead (current step).
The inrush current detection creates a blocking signal.
CWA Process
²
Create a test current that has flat ranges of a minimum width of 3 ms simultaneously in all 3 phase
currents.
The inrush current detection creates a blocking signal.
11.7
Functional Tests
11.7 Functional Test of the Inrush-Current Detection
SIPROTEC 5, Overcurrent Protection, Manual 1385
C53000-G5040-C017-8, Edition 07.2017
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