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Number of zones
The distance protection for phase-to-phase faults (ZS) includes six measuring zones and these
are termed Z1S, Z1XS, Z2S, Z3S, Z4S and Z5S. The distance protection for single-phase-earth
faults (ZG) also includes six measuring zones that are similarly termed Z1G, Z1XG, Z2G, Z3G,
Z4G and Z5G.
Z1XS–Z5S Mho with impedance Z
Figure 2.10-14 Composition feature for Mho characteristic
Selection of Forward, Reverse, or Non-directional for the respective zones
The selection of the element direction is provided with the setting [Z*S-Dir]. For instance, if
Forward is set, then Z*S is set in forward direction, as shown in Figure 2.10-11 to Figure
2.10-13. If Reverse is set, then Z*S is set in reverse direction, as shown in Figure 2.10-15 to
Figure 2.10-17. Z*S can be set non-directional by setting NonDir, as shown in Figure 2.10-18
and Figure 2.10-19. The other elements can be set in a similar manner.
Elements in the reverse direction of ZG are not drawn in Figure 2.10-15 to Figure 2.10-17,
but they are similar to the ZS elements.
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