Functions
2.10 Monitoring Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
166
The following logic diagram illustrates the operational mode of the current sum monitoring.
Figure 2-49 Logic Diagram of the fast current sum monitoring
Note
If the current input IN is configured as a sensitive transformer or if the connection mode A,G2,C,G; G->B or
A,G2,C,G; G2->B was set for the current transformers at parameter 251 CT Connect., current sum mon-
itoring is not possible.
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.
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