Inrush Response - Siemens Reyrolle 7SR45 Argus Device Manual

5.7

Inrush Response

The 7SR45 Argus Relay is designed with immunity against inrush currents (15 % of 2
the peak current with fundamental component (50 Hz/60 Hz) inside the currents less than 95 % of I
During charging of transformer in the distribution system, the inrush current is generated and the relay does
not respond to the inrush current up to 3 times the peak value as its not a fault condition.
For example, in the waveform shown in the following figure, the inrush currents have been simulated for 3
times the peak values of the phase overcurrent setting (51-1: I
current is monitored. The 2
mental current component is less than 0.85 A (< 95 % I
[dw_Inrush-currents-wWaveform, 1, en_US]
Figure 5-8
[dw_pickup_and_trip-status-during-inrush, 1, en_US]
Figure 5-9
In the waveform, the fundamental component of the 50-Hz signal is less than 0.85 A and the peak current is
typically 3 times of I
NOTE
i
i
The inrush response is applicable for 7SR450[1/3]-xGA10-1AA0 variants only.
Reyrolle, 7SR45, Device Manual
C53000-G7040-C101-2, Edition 09.2020
nd harmonic content of the simulated inrush currents is 15 % and the relay funda-
Inrush Currents Waveform
Pickup and Trip Status during Inrush
. The relay in this condition does not initiate the trip signal.
set
– 0.9 A) and the relay response for the inrush
set
).
set
Applications

5.7 Inrush Response

nd harmonic) up to 3 times
.
set
101