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Figure 2-44
Phase-to-Earth Loops
For the calculation of the phase-to-earth loop, for example during an L3-E short-circuit (Figure 2-45) it must be
noted that the impedance of the earth return path does not correspond to the impedance of the phase.
Figure 2-45
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
Logic for a phase-to-phase measuring unit, shown by the example of the L1-L2 loop
Single-phase earth fault, fault loop
Functions
2.5 Distance Protection
125
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