A Appendix
376
7UM61 Manual
C53000-G1176-C127-3
A.4.6 Pre-defined CFC Charts
Some CFC Charts are already supplied with the SIPROTEC
®
device.
Device and System
Logic
The single-point indication DataStop that can be injected by binary inputs is converted
by means of a NEGATOR block into an indication UnlockDT that can be processed
internally (internal single point indication, IntSP), and assigned to an output. This
would not be possible directly, i.e. without the additional block.
Figure A-25 Link between Input and Output for Transmission Block
Limit value han-
dling MW
Using modules on the running sequence ”measured value processing", an undercur-
rent monitor for the three phase currents is implemented. The output indication is
issued as soon as one of the three phase currents undershoots the set threshold:
Figure A-26 Undercurrent monitoring
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