Siemens 7SR45 Manual page 69

[dw_7SR45 sensitivity (pulse outputs), 3, en_US]
Figure 6-2
NOTE
i
i
Multi-phase current improves the sensitivity.
NOTE
i
i
The removal/drainage of both main battery and RTC battery will delay sensitivity of the product.
The presence/non-drainage of main battery and removal/drainage of the RTC battery will not impact the
sensitivity of the product.
Time Delayed Overcurrent Protection during Start up (51, 51G, 51N)
The operating times of the protection functions (51, 51G, 51N) are optimized at the lower current settings,
when the relay is energized with the short-circuit current or fault current.
The optimization of the operating time is done only in the startup condition for the first 25 AC cycles if the
fault current persists.
The optimization is done as per the sensitivity characteristics of the binary output. However, if the calculated
operating time is less than the pulse output sensitivity characteristics, the operating time of the pulse output
also improves.
Reyrolle, Operating, Manual
C53000-B7040-C101-1, Edition 08.2020
Sensitivity for 1-Phase Fault with Pulse Output
In Service Operation
6.4 Modes of Operation
69