(Ohm/loop)
ANSI11000415-1-en.vsd
ANSI11000415 V1 EN-US
Figure 151: ZMFPDIS Characteristic for phase-to-ground measuring, ohm/loop domain
The faulty loop in relation to the fault type can be presented as in figure 152. The main intention
with this illustration is to make clear how the fault resistive reach should be interpreted and set.
Note in particular that the setting RFPP always represents the total fault resistance of the loop,
regardless the fact that the fault resistance (arc) may be divided into parts like for three-phase or
phase-to-phase faults. The R1 + jX1 represent the positive sequence impedance from the
measuring point to the fault location.
1MRK 502 066-UUS B Section 7
Impedance protection
307
Technical manual
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