Both current limits IMinOpPGZx and IMinOpPPZx are automatically reduced to 75% of
regular set values if the zone is set to operate in reverse direction, that is, OperationDir is
set to Reverse.
OpModePPZx and OpModePEZx
These settings, two per zone (x=1,2..5&RV), with options {Off, Quadrilateral, Mho,
Offset}, are used to set the operation and characteristic for phase-to-earth and phase-to-
phase faults, respectively.
For example, in one zone it is possible to choose Mho characteristic for the three Ph-Ph
measuring loops and Quadrilateral characteristic for the three Ph-E measuring loops.
DirModeZx
This setting defines the operating direction for zones Z3, Z4 and Z5 (the directionality of
zones Z1, Z2 and ZRV is fixed). The options are Non-directional, Forward or Reverse.
The result from respective set value is illustrated in figure
184, where the positive
impedance corresponds to the direction out on the protected line.
IEC05000182-2-en.vsdx
R
X
R
X
R
X
Non-directional Forward Reverse
IEC05000182 V2 EN
Figure 184: Directional operating modes of the distance measuring zones 3 to 5
tPPZx, tPGZx, TimerModeZx, ZoneLinkPU and TimerLinksZx
The logic for the linking of the timer settings can be described with a module diagram. The
following figure shows only the case when TimerModeZx is selected to Ph-Ph and Ph-G.
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 381
Application manual
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