Siemens SIPROTEC 5 Manual page 396

Supervision Functions
8.4 Supervision of the Device Hardware
Logic
[losumsch-240413-01.tif, 3, en_US]
Figure 8-26
When the output signal A/D converter monit. is active, certain protection functions are blocked to avoid
failures (see 11.5.8 Analog Channel Supervision via Fast Current Sum
NOTE
i
i
The parameters are fixed in the device and cannot be changed.
It is not necessary to change the parameters depending on the application.
Threshold Value
The threshold value is the lower limit of the operating range of the Supervision of the device-internal
analog-digital converters function.
The threshold value is fixed to 10 % of the device rated current.
Slope of the Characteristic 1
The component slope of characteristic 1 • Σ | i | takes into account permissible current-input errors, which
can occur in the case of small overcurrents.
The slope of characteristic 1 is fixed to 0.1.
Slope of the Characteristic 2
The component slope of characteristic 2 takes into account permissible current-input errors, which can occur
in the case of high overcurrents (high short-circuit currents).
396
Logic Diagram of the Supervision of the Device-Internal Analog-Digital Converters
).
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017