RFPPFwZ3: This is used to set the forward fault resistive reach in Ohm/p for
phase-to-phase faults in zone 3. This may be set identical to zone 2 setting resistive
reach.
RFPPRvZ3: This is used to set the reverse fault resistive reach in Ohm/p for phase-
to-phase faults in zone 3. This may be set identical to zone 2 setting resistive reach.
TimerSelZ3
: This is used to set the zone timer selection mode of zone 3. i.e. Timers
separated, Timers linked, General start, PhSel start, Internal start and External
start. The default setting is Timers separated.
OpModetPEZ3: This is used to set the Off/On operation of the phase-to-earth timer
of zone 3. The default setting is Off.
tPEZ3: This is used to set the time delay to trip for phase-to-earth faults in zone 3.
It should be set so that it provides discrimination with the operating time of relays
provided in subsequent sections which zone 3 reach of relay being set, overlaps.
The default setting is 0.7 s.
OpModetPPZ3: This is used to set the Off/On operation of the phase-to-phase timer
of zone 3. The default setting is Off.
tPPZ3: This is used to set the time delay to trip for phase-to-phase faults in zone 3.
It should be set so that it provides discrimination with the operating time of relays
provided in subsequent sections which zone 3 reach of relay being set, overlaps.
The default setting is 0.7 s.
Zone 4
GUID-E42EF947-C601-494A-B561-390BBF616356 v2
OpZ4: This is used for the Off/On operation of zone 4 and it is set to Off by default.
This can be used as reverse zone.
DirModeZ4: This is used to set the zone 4 direction mode. It can be set to Non-
directional, Forward and Reverse.
PhSelModeZ4: This is used to enable the measuring loops of zone 4. It can be set to
Phsel logic, Release L1E, ReleaseL2E, Release PE, Release L1L2 and Release
PE&PP modes. The default setting is Phsel logic mode.
LEModeZ4: This is used to operate the load discrimination characteristic of zone 4.
The default setting is Off.
LCModeZ4: This is used to enable/disable the adaptive load compensation mode of
zone 4. It avoids overreaching of the zone in to the next section in case of resistive
fault due to remote end feed. Generally, this setting is not needed for zone 4. The
default setting is Off.
X1FwZ4: This is used to set the forward positive sequence reactance reach of zone
4 in Ohm/p. It may be set identical to X1RvZ4.
Section 7 1MRK 506 375-UEN A
Impedance protection
120 Railway application RER670 2.2 IEC
Application manual
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