Siemens SIPROTEC 7SJ62 Manual page 199

The following logic diagram illustrates the operational mode of the current sum monitoring.
Figure 2-65 Logic Diagram of the fast current sum monitoring
AD Transformer Monitoring
The digitized sampled values are being monitored in respect of their plausibility. If the result is not plausible,
message 181 „Error A/D-conv." is issued. The protection is blocked, thus preventing unwanted operation.
Furthermore, a fault record is generated for recording of the internal fault.
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Functions
2.11 Monitoring Functions
199