Functions
2.10 Monitoring Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
163
Figure 2-49 Logic diagram of the Fuse Failure Monitor for grounded networks
Mode of Operation - Isolated System
The FFM can also operate in isolated and compensated (resonant-grounded) systems where only low ground
currents are to be expected. The device is informed of that via address 5301 FUSE FAIL MON..
The logic diagram on the mode of operation in an isolated system is illustrated in Figure 2-50. The following is
a description of the principles for single-, two- and three-pole faults in a secondary voltage transformer system.
If this part of the FFM logic picks up, the internal signal „Alarm FFM isol. N.“ is generated, the further processing
of which is indicated in Figure 2-49.
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