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Functions
2.10 Monitoring Functions
Figure 2-53
Single- and Two-phase Failures in Voltage Transformer Circuits
The measuring voltage failure detection is based on the fact that a significant negative sequence system is
formed in the voltage during single- or two-phase voltage failure, however without influencing the current. This
enables a clear distinction from asymmetries impressed by the power system. If the negative sequence system
is related to the current positive sequence system, the following rules apply to the Fault-free Case:
172
Logic diagram of the Fuse Failure Monitor for isolated systems
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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